1 /*
2 * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #ifndef _WINDOWS
27 #include "alloca.h"
28 #endif
29 #include "asm/macroAssembler.hpp"
30 #include "asm/macroAssembler.inline.hpp"
31 #include "code/debugInfoRec.hpp"
32 #include "code/icBuffer.hpp"
33 #include "code/nativeInst.hpp"
34 #include "code/vtableStubs.hpp"
35 #include "gc/shared/gcLocker.hpp"
36 #include "gc/shared/collectedHeap.hpp"
37 #include "interpreter/interpreter.hpp"
38 #include "logging/log.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "oops/compiledICHolder.hpp"
41 #include "runtime/safepointMechanism.hpp"
42 #include "runtime/sharedRuntime.hpp"
43 #include "runtime/vframeArray.hpp"
44 #include "utilities/align.hpp"
45 #include "utilities/formatBuffer.hpp"
46 #include "vm_version_x86.hpp"
47 #include "vmreg_x86.inline.hpp"
48 #ifdef COMPILER1
49 #include "c1/c1_Runtime1.hpp"
50 #endif
51 #ifdef COMPILER2
52 #include "opto/runtime.hpp"
53 #endif
54 #if INCLUDE_JVMCI
55 #include "jvmci/jvmciJavaClasses.hpp"
56 #endif
57
58 #define __ masm->
59
60 const int StackAlignmentInSlots = StackAlignmentInBytes / VMRegImpl::stack_slot_size;
61
62 class SimpleRuntimeFrame {
63
64 public:
65
66 // Most of the runtime stubs have this simple frame layout.
67 // This class exists to make the layout shared in one place.
68 // Offsets are for compiler stack slots, which are jints.
69 enum layout {
70 // The frame sender code expects that rbp will be in the "natural" place and
71 // will override any oopMap setting for it. We must therefore force the layout
72 // so that it agrees with the frame sender code.
73 rbp_off = frame::arg_reg_save_area_bytes/BytesPerInt,
74 rbp_off2,
75 return_off, return_off2,
76 framesize
77 };
78 };
79
80 class RegisterSaver {
81 // Capture info about frame layout. Layout offsets are in jint
82 // units because compiler frame slots are jints.
83 #define XSAVE_AREA_BEGIN 160
84 #define XSAVE_AREA_YMM_BEGIN 576
85 #define XSAVE_AREA_ZMM_BEGIN 1152
86 #define XSAVE_AREA_UPPERBANK 1664
87 #define DEF_XMM_OFFS(regnum) xmm ## regnum ## _off = xmm_off + (regnum)*16/BytesPerInt, xmm ## regnum ## H_off
88 #define DEF_YMM_OFFS(regnum) ymm ## regnum ## _off = ymm_off + (regnum)*16/BytesPerInt, ymm ## regnum ## H_off
89 #define DEF_ZMM_OFFS(regnum) zmm ## regnum ## _off = zmm_off + (regnum-16)*64/BytesPerInt, zmm ## regnum ## H_off
90 enum layout {
91 fpu_state_off = frame::arg_reg_save_area_bytes/BytesPerInt, // fxsave save area
92 xmm_off = fpu_state_off + XSAVE_AREA_BEGIN/BytesPerInt, // offset in fxsave save area
93 DEF_XMM_OFFS(0),
94 DEF_XMM_OFFS(1),
95 // 2..15 are implied in range usage
96 ymm_off = xmm_off + (XSAVE_AREA_YMM_BEGIN - XSAVE_AREA_BEGIN)/BytesPerInt,
97 DEF_YMM_OFFS(0),
98 DEF_YMM_OFFS(1),
99 // 2..15 are implied in range usage
100 zmm_high = xmm_off + (XSAVE_AREA_ZMM_BEGIN - XSAVE_AREA_BEGIN)/BytesPerInt,
101 zmm_off = xmm_off + (XSAVE_AREA_UPPERBANK - XSAVE_AREA_BEGIN)/BytesPerInt,
102 DEF_ZMM_OFFS(16),
103 DEF_ZMM_OFFS(17),
104 // 18..31 are implied in range usage
105 fpu_state_end = fpu_state_off + ((FPUStateSizeInWords-1)*wordSize / BytesPerInt),
106 fpu_stateH_end,
107 r15_off, r15H_off,
108 r14_off, r14H_off,
109 r13_off, r13H_off,
110 r12_off, r12H_off,
111 r11_off, r11H_off,
112 r10_off, r10H_off,
113 r9_off, r9H_off,
114 r8_off, r8H_off,
115 rdi_off, rdiH_off,
116 rsi_off, rsiH_off,
117 ignore_off, ignoreH_off, // extra copy of rbp
118 rsp_off, rspH_off,
119 rbx_off, rbxH_off,
120 rdx_off, rdxH_off,
121 rcx_off, rcxH_off,
122 rax_off, raxH_off,
123 // 16-byte stack alignment fill word: see MacroAssembler::push/pop_IU_state
124 align_off, alignH_off,
125 flags_off, flagsH_off,
126 // The frame sender code expects that rbp will be in the "natural" place and
127 // will override any oopMap setting for it. We must therefore force the layout
128 // so that it agrees with the frame sender code.
129 rbp_off, rbpH_off, // copy of rbp we will restore
130 return_off, returnH_off, // slot for return address
131 reg_save_size // size in compiler stack slots
132 };
133
134 public:
135 static OopMap* save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words, bool save_vectors = false);
136 static void restore_live_registers(MacroAssembler* masm, bool restore_vectors = false);
137
138 // Offsets into the register save area
139 // Used by deoptimization when it is managing result register
140 // values on its own
141
142 static int rax_offset_in_bytes(void) { return BytesPerInt * rax_off; }
143 static int rdx_offset_in_bytes(void) { return BytesPerInt * rdx_off; }
144 static int rbx_offset_in_bytes(void) { return BytesPerInt * rbx_off; }
145 static int xmm0_offset_in_bytes(void) { return BytesPerInt * xmm0_off; }
146 static int return_offset_in_bytes(void) { return BytesPerInt * return_off; }
147
148 // During deoptimization only the result registers need to be restored,
149 // all the other values have already been extracted.
150 static void restore_result_registers(MacroAssembler* masm);
151 };
152
153 OopMap* RegisterSaver::save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words, bool save_vectors) {
154 int off = 0;
155 int num_xmm_regs = XMMRegisterImpl::number_of_registers;
156 if (UseAVX < 3) {
157 num_xmm_regs = num_xmm_regs/2;
158 }
159 #if COMPILER2_OR_JVMCI
160 if (save_vectors) {
161 assert(UseAVX > 0, "Vectors larger than 16 byte long are supported only with AVX");
162 assert(MaxVectorSize <= 64, "Only up to 64 byte long vectors are supported");
163 }
164 #else
165 assert(!save_vectors, "vectors are generated only by C2 and JVMCI");
166 #endif
167
168 // Always make the frame size 16-byte aligned, both vector and non vector stacks are always allocated
169 int frame_size_in_bytes = align_up(reg_save_size*BytesPerInt, num_xmm_regs);
170 // OopMap frame size is in compiler stack slots (jint's) not bytes or words
171 int frame_size_in_slots = frame_size_in_bytes / BytesPerInt;
172 // CodeBlob frame size is in words.
173 int frame_size_in_words = frame_size_in_bytes / wordSize;
174 *total_frame_words = frame_size_in_words;
175
176 // Save registers, fpu state, and flags.
177 // We assume caller has already pushed the return address onto the
178 // stack, so rsp is 8-byte aligned here.
179 // We push rpb twice in this sequence because we want the real rbp
180 // to be under the return like a normal enter.
181
182 __ enter(); // rsp becomes 16-byte aligned here
183 __ push_CPU_state(); // Push a multiple of 16 bytes
184
185 // push cpu state handles this on EVEX enabled targets
186 if (save_vectors) {
187 // Save upper half of YMM registers(0..15)
188 int base_addr = XSAVE_AREA_YMM_BEGIN;
189 for (int n = 0; n < 16; n++) {
190 __ vextractf128_high(Address(rsp, base_addr+n*16), as_XMMRegister(n));
191 }
192 if (VM_Version::supports_evex()) {
193 // Save upper half of ZMM registers(0..15)
194 base_addr = XSAVE_AREA_ZMM_BEGIN;
195 for (int n = 0; n < 16; n++) {
196 __ vextractf64x4_high(Address(rsp, base_addr+n*32), as_XMMRegister(n));
197 }
198 // Save full ZMM registers(16..num_xmm_regs)
199 base_addr = XSAVE_AREA_UPPERBANK;
200 off = 0;
201 int vector_len = Assembler::AVX_512bit;
202 for (int n = 16; n < num_xmm_regs; n++) {
203 __ evmovdqul(Address(rsp, base_addr+(off++*64)), as_XMMRegister(n), vector_len);
204 }
205 }
206 } else {
207 if (VM_Version::supports_evex()) {
208 // Save upper bank of ZMM registers(16..31) for double/float usage
209 int base_addr = XSAVE_AREA_UPPERBANK;
210 off = 0;
211 for (int n = 16; n < num_xmm_regs; n++) {
212 __ movsd(Address(rsp, base_addr+(off++*64)), as_XMMRegister(n));
213 }
214 }
215 }
216 __ vzeroupper();
217 if (frame::arg_reg_save_area_bytes != 0) {
218 // Allocate argument register save area
219 __ subptr(rsp, frame::arg_reg_save_area_bytes);
220 }
221
222 // Set an oopmap for the call site. This oopmap will map all
223 // oop-registers and debug-info registers as callee-saved. This
224 // will allow deoptimization at this safepoint to find all possible
225 // debug-info recordings, as well as let GC find all oops.
226
227 OopMapSet *oop_maps = new OopMapSet();
228 OopMap* map = new OopMap(frame_size_in_slots, 0);
229
230 #define STACK_OFFSET(x) VMRegImpl::stack2reg((x))
231
232 map->set_callee_saved(STACK_OFFSET( rax_off ), rax->as_VMReg());
233 map->set_callee_saved(STACK_OFFSET( rcx_off ), rcx->as_VMReg());
234 map->set_callee_saved(STACK_OFFSET( rdx_off ), rdx->as_VMReg());
235 map->set_callee_saved(STACK_OFFSET( rbx_off ), rbx->as_VMReg());
236 // rbp location is known implicitly by the frame sender code, needs no oopmap
237 // and the location where rbp was saved by is ignored
238 map->set_callee_saved(STACK_OFFSET( rsi_off ), rsi->as_VMReg());
239 map->set_callee_saved(STACK_OFFSET( rdi_off ), rdi->as_VMReg());
240 map->set_callee_saved(STACK_OFFSET( r8_off ), r8->as_VMReg());
241 map->set_callee_saved(STACK_OFFSET( r9_off ), r9->as_VMReg());
242 map->set_callee_saved(STACK_OFFSET( r10_off ), r10->as_VMReg());
243 map->set_callee_saved(STACK_OFFSET( r11_off ), r11->as_VMReg());
244 map->set_callee_saved(STACK_OFFSET( r12_off ), r12->as_VMReg());
245 map->set_callee_saved(STACK_OFFSET( r13_off ), r13->as_VMReg());
246 map->set_callee_saved(STACK_OFFSET( r14_off ), r14->as_VMReg());
247 map->set_callee_saved(STACK_OFFSET( r15_off ), r15->as_VMReg());
248 // For both AVX and EVEX we will use the legacy FXSAVE area for xmm0..xmm15,
249 // on EVEX enabled targets, we get it included in the xsave area
250 off = xmm0_off;
251 int delta = xmm1_off - off;
252 for (int n = 0; n < 16; n++) {
253 XMMRegister xmm_name = as_XMMRegister(n);
254 map->set_callee_saved(STACK_OFFSET(off), xmm_name->as_VMReg());
255 off += delta;
256 }
257 if(UseAVX > 2) {
258 // Obtain xmm16..xmm31 from the XSAVE area on EVEX enabled targets
259 off = zmm16_off;
260 delta = zmm17_off - off;
261 for (int n = 16; n < num_xmm_regs; n++) {
262 XMMRegister zmm_name = as_XMMRegister(n);
263 map->set_callee_saved(STACK_OFFSET(off), zmm_name->as_VMReg());
264 off += delta;
265 }
266 }
267
268 #if COMPILER2_OR_JVMCI
269 if (save_vectors) {
270 off = ymm0_off;
271 int delta = ymm1_off - off;
272 for (int n = 0; n < 16; n++) {
273 XMMRegister ymm_name = as_XMMRegister(n);
274 map->set_callee_saved(STACK_OFFSET(off), ymm_name->as_VMReg()->next(4));
275 off += delta;
276 }
277 }
278 #endif // COMPILER2_OR_JVMCI
279
280 // %%% These should all be a waste but we'll keep things as they were for now
281 if (true) {
282 map->set_callee_saved(STACK_OFFSET( raxH_off ), rax->as_VMReg()->next());
283 map->set_callee_saved(STACK_OFFSET( rcxH_off ), rcx->as_VMReg()->next());
284 map->set_callee_saved(STACK_OFFSET( rdxH_off ), rdx->as_VMReg()->next());
285 map->set_callee_saved(STACK_OFFSET( rbxH_off ), rbx->as_VMReg()->next());
286 // rbp location is known implicitly by the frame sender code, needs no oopmap
287 map->set_callee_saved(STACK_OFFSET( rsiH_off ), rsi->as_VMReg()->next());
288 map->set_callee_saved(STACK_OFFSET( rdiH_off ), rdi->as_VMReg()->next());
289 map->set_callee_saved(STACK_OFFSET( r8H_off ), r8->as_VMReg()->next());
290 map->set_callee_saved(STACK_OFFSET( r9H_off ), r9->as_VMReg()->next());
291 map->set_callee_saved(STACK_OFFSET( r10H_off ), r10->as_VMReg()->next());
292 map->set_callee_saved(STACK_OFFSET( r11H_off ), r11->as_VMReg()->next());
293 map->set_callee_saved(STACK_OFFSET( r12H_off ), r12->as_VMReg()->next());
294 map->set_callee_saved(STACK_OFFSET( r13H_off ), r13->as_VMReg()->next());
295 map->set_callee_saved(STACK_OFFSET( r14H_off ), r14->as_VMReg()->next());
296 map->set_callee_saved(STACK_OFFSET( r15H_off ), r15->as_VMReg()->next());
297 // For both AVX and EVEX we will use the legacy FXSAVE area for xmm0..xmm15,
298 // on EVEX enabled targets, we get it included in the xsave area
299 off = xmm0H_off;
300 delta = xmm1H_off - off;
301 for (int n = 0; n < 16; n++) {
302 XMMRegister xmm_name = as_XMMRegister(n);
303 map->set_callee_saved(STACK_OFFSET(off), xmm_name->as_VMReg()->next());
304 off += delta;
305 }
306 if (UseAVX > 2) {
307 // Obtain xmm16..xmm31 from the XSAVE area on EVEX enabled targets
308 off = zmm16H_off;
309 delta = zmm17H_off - off;
310 for (int n = 16; n < num_xmm_regs; n++) {
311 XMMRegister zmm_name = as_XMMRegister(n);
312 map->set_callee_saved(STACK_OFFSET(off), zmm_name->as_VMReg()->next());
313 off += delta;
314 }
315 }
316 }
317
318 return map;
319 }
320
321 void RegisterSaver::restore_live_registers(MacroAssembler* masm, bool restore_vectors) {
322 int num_xmm_regs = XMMRegisterImpl::number_of_registers;
323 if (UseAVX < 3) {
324 num_xmm_regs = num_xmm_regs/2;
325 }
326 if (frame::arg_reg_save_area_bytes != 0) {
327 // Pop arg register save area
328 __ addptr(rsp, frame::arg_reg_save_area_bytes);
329 }
330
331 #if COMPILER2_OR_JVMCI
332 if (restore_vectors) {
333 assert(UseAVX > 0, "Vectors larger than 16 byte long are supported only with AVX");
334 assert(MaxVectorSize <= 64, "Only up to 64 byte long vectors are supported");
335 }
336 #else
337 assert(!restore_vectors, "vectors are generated only by C2");
338 #endif
339
340 __ vzeroupper();
341
342 // On EVEX enabled targets everything is handled in pop fpu state
343 if (restore_vectors) {
344 // Restore upper half of YMM registers (0..15)
345 int base_addr = XSAVE_AREA_YMM_BEGIN;
346 for (int n = 0; n < 16; n++) {
347 __ vinsertf128_high(as_XMMRegister(n), Address(rsp, base_addr+n*16));
348 }
349 if (VM_Version::supports_evex()) {
350 // Restore upper half of ZMM registers (0..15)
351 base_addr = XSAVE_AREA_ZMM_BEGIN;
352 for (int n = 0; n < 16; n++) {
353 __ vinsertf64x4_high(as_XMMRegister(n), Address(rsp, base_addr+n*32));
354 }
355 // Restore full ZMM registers(16..num_xmm_regs)
356 base_addr = XSAVE_AREA_UPPERBANK;
357 int vector_len = Assembler::AVX_512bit;
358 int off = 0;
359 for (int n = 16; n < num_xmm_regs; n++) {
360 __ evmovdqul(as_XMMRegister(n), Address(rsp, base_addr+(off++*64)), vector_len);
361 }
362 }
363 } else {
364 if (VM_Version::supports_evex()) {
365 // Restore upper bank of ZMM registers(16..31) for double/float usage
366 int base_addr = XSAVE_AREA_UPPERBANK;
367 int off = 0;
368 for (int n = 16; n < num_xmm_regs; n++) {
369 __ movsd(as_XMMRegister(n), Address(rsp, base_addr+(off++*64)));
370 }
371 }
372 }
373
374 // Recover CPU state
375 __ pop_CPU_state();
376 // Get the rbp described implicitly by the calling convention (no oopMap)
377 __ pop(rbp);
378 }
379
380 void RegisterSaver::restore_result_registers(MacroAssembler* masm) {
381
382 // Just restore result register. Only used by deoptimization. By
383 // now any callee save register that needs to be restored to a c2
384 // caller of the deoptee has been extracted into the vframeArray
385 // and will be stuffed into the c2i adapter we create for later
386 // restoration so only result registers need to be restored here.
387
388 // Restore fp result register
389 __ movdbl(xmm0, Address(rsp, xmm0_offset_in_bytes()));
390 // Restore integer result register
391 __ movptr(rax, Address(rsp, rax_offset_in_bytes()));
392 __ movptr(rdx, Address(rsp, rdx_offset_in_bytes()));
393
394 // Pop all of the register save are off the stack except the return address
395 __ addptr(rsp, return_offset_in_bytes());
396 }
397
398 // Is vector's size (in bytes) bigger than a size saved by default?
399 // 16 bytes XMM registers are saved by default using fxsave/fxrstor instructions.
400 bool SharedRuntime::is_wide_vector(int size) {
401 return size > 16;
402 }
403
404 size_t SharedRuntime::trampoline_size() {
405 return 16;
406 }
407
408 void SharedRuntime::generate_trampoline(MacroAssembler *masm, address destination) {
409 __ jump(RuntimeAddress(destination));
410 }
411
412 // The java_calling_convention describes stack locations as ideal slots on
413 // a frame with no abi restrictions. Since we must observe abi restrictions
414 // (like the placement of the register window) the slots must be biased by
415 // the following value.
416 static int reg2offset_in(VMReg r) {
417 // Account for saved rbp and return address
418 // This should really be in_preserve_stack_slots
419 return (r->reg2stack() + 4) * VMRegImpl::stack_slot_size;
420 }
421
422 static int reg2offset_out(VMReg r) {
423 return (r->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size;
424 }
425
426 // ---------------------------------------------------------------------------
427 // Read the array of BasicTypes from a signature, and compute where the
428 // arguments should go. Values in the VMRegPair regs array refer to 4-byte
429 // quantities. Values less than VMRegImpl::stack0 are registers, those above
430 // refer to 4-byte stack slots. All stack slots are based off of the stack pointer
431 // as framesizes are fixed.
432 // VMRegImpl::stack0 refers to the first slot 0(sp).
433 // and VMRegImpl::stack0+1 refers to the memory word 4-byes higher. Register
434 // up to RegisterImpl::number_of_registers) are the 64-bit
435 // integer registers.
436
437 // Note: the INPUTS in sig_bt are in units of Java argument words, which are
438 // either 32-bit or 64-bit depending on the build. The OUTPUTS are in 32-bit
439 // units regardless of build. Of course for i486 there is no 64 bit build
440
441 // The Java calling convention is a "shifted" version of the C ABI.
442 // By skipping the first C ABI register we can call non-static jni methods
443 // with small numbers of arguments without having to shuffle the arguments
444 // at all. Since we control the java ABI we ought to at least get some
445 // advantage out of it.
446
447 int SharedRuntime::java_calling_convention(const BasicType *sig_bt,
448 VMRegPair *regs,
449 int total_args_passed,
450 int is_outgoing) {
451
452 // Create the mapping between argument positions and
453 // registers.
454 static const Register INT_ArgReg[Argument::n_int_register_parameters_j] = {
455 j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5
456 };
457 static const XMMRegister FP_ArgReg[Argument::n_float_register_parameters_j] = {
458 j_farg0, j_farg1, j_farg2, j_farg3,
459 j_farg4, j_farg5, j_farg6, j_farg7
460 };
461
462
463 uint int_args = 0;
464 uint fp_args = 0;
465 uint stk_args = 0; // inc by 2 each time
466
467 for (int i = 0; i < total_args_passed; i++) {
468 switch (sig_bt[i]) {
469 case T_BOOLEAN:
470 case T_CHAR:
471 case T_BYTE:
472 case T_SHORT:
473 case T_INT:
474 if (int_args < Argument::n_int_register_parameters_j) {
475 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg());
476 } else {
477 regs[i].set1(VMRegImpl::stack2reg(stk_args));
478 stk_args += 2;
479 }
480 break;
481 case T_VOID:
482 // halves of T_LONG or T_DOUBLE
483 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half");
484 regs[i].set_bad();
485 break;
486 case T_LONG:
487 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
488 // fall through
489 case T_OBJECT:
490 case T_ARRAY:
491 case T_ADDRESS:
492 if (int_args < Argument::n_int_register_parameters_j) {
493 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg());
494 } else {
495 regs[i].set2(VMRegImpl::stack2reg(stk_args));
496 stk_args += 2;
497 }
498 break;
499 case T_FLOAT:
500 if (fp_args < Argument::n_float_register_parameters_j) {
501 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg());
502 } else {
503 regs[i].set1(VMRegImpl::stack2reg(stk_args));
504 stk_args += 2;
505 }
506 break;
507 case T_DOUBLE:
508 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
509 if (fp_args < Argument::n_float_register_parameters_j) {
510 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg());
511 } else {
512 regs[i].set2(VMRegImpl::stack2reg(stk_args));
513 stk_args += 2;
514 }
515 break;
516 default:
517 ShouldNotReachHere();
518 break;
519 }
520 }
521
522 return align_up(stk_args, 2);
523 }
524
525 // Patch the callers callsite with entry to compiled code if it exists.
526 static void patch_callers_callsite(MacroAssembler *masm) {
527 Label L;
528 __ cmpptr(Address(rbx, in_bytes(Method::code_offset())), (int32_t)NULL_WORD);
529 __ jcc(Assembler::equal, L);
530
531 // Save the current stack pointer
532 __ mov(r13, rsp);
533 // Schedule the branch target address early.
534 // Call into the VM to patch the caller, then jump to compiled callee
535 // rax isn't live so capture return address while we easily can
536 __ movptr(rax, Address(rsp, 0));
537
538 // align stack so push_CPU_state doesn't fault
539 __ andptr(rsp, -(StackAlignmentInBytes));
540 __ push_CPU_state();
541 __ vzeroupper();
542 // VM needs caller's callsite
543 // VM needs target method
544 // This needs to be a long call since we will relocate this adapter to
545 // the codeBuffer and it may not reach
546
547 // Allocate argument register save area
548 if (frame::arg_reg_save_area_bytes != 0) {
549 __ subptr(rsp, frame::arg_reg_save_area_bytes);
550 }
551 __ mov(c_rarg0, rbx);
552 __ mov(c_rarg1, rax);
553 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite)));
554
555 // De-allocate argument register save area
556 if (frame::arg_reg_save_area_bytes != 0) {
557 __ addptr(rsp, frame::arg_reg_save_area_bytes);
558 }
559
560 __ vzeroupper();
561 __ pop_CPU_state();
562 // restore sp
563 __ mov(rsp, r13);
564 __ bind(L);
565 }
566
567
568 static void gen_c2i_adapter(MacroAssembler *masm,
569 int total_args_passed,
570 int comp_args_on_stack,
571 const BasicType *sig_bt,
572 const VMRegPair *regs,
573 Label& skip_fixup) {
574 // Before we get into the guts of the C2I adapter, see if we should be here
575 // at all. We've come from compiled code and are attempting to jump to the
576 // interpreter, which means the caller made a static call to get here
577 // (vcalls always get a compiled target if there is one). Check for a
578 // compiled target. If there is one, we need to patch the caller's call.
579 patch_callers_callsite(masm);
580
581 __ bind(skip_fixup);
582
583 // Since all args are passed on the stack, total_args_passed *
584 // Interpreter::stackElementSize is the space we need. Plus 1 because
585 // we also account for the return address location since
586 // we store it first rather than hold it in rax across all the shuffling
587
588 int extraspace = (total_args_passed * Interpreter::stackElementSize) + wordSize;
589
590 // stack is aligned, keep it that way
591 extraspace = align_up(extraspace, 2*wordSize);
592
593 // Get return address
594 __ pop(rax);
595
596 // set senderSP value
597 __ mov(r13, rsp);
598
599 __ subptr(rsp, extraspace);
600
601 // Store the return address in the expected location
602 __ movptr(Address(rsp, 0), rax);
603
604 // Now write the args into the outgoing interpreter space
605 for (int i = 0; i < total_args_passed; i++) {
606 if (sig_bt[i] == T_VOID) {
607 assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half");
608 continue;
609 }
610
611 // offset to start parameters
612 int st_off = (total_args_passed - i) * Interpreter::stackElementSize;
613 int next_off = st_off - Interpreter::stackElementSize;
614
615 // Say 4 args:
616 // i st_off
617 // 0 32 T_LONG
618 // 1 24 T_VOID
619 // 2 16 T_OBJECT
620 // 3 8 T_BOOL
621 // - 0 return address
622 //
623 // However to make thing extra confusing. Because we can fit a long/double in
624 // a single slot on a 64 bt vm and it would be silly to break them up, the interpreter
625 // leaves one slot empty and only stores to a single slot. In this case the
626 // slot that is occupied is the T_VOID slot. See I said it was confusing.
627
628 VMReg r_1 = regs[i].first();
629 VMReg r_2 = regs[i].second();
630 if (!r_1->is_valid()) {
631 assert(!r_2->is_valid(), "");
632 continue;
633 }
634 if (r_1->is_stack()) {
635 // memory to memory use rax
636 int ld_off = r_1->reg2stack() * VMRegImpl::stack_slot_size + extraspace;
637 if (!r_2->is_valid()) {
638 // sign extend??
639 __ movl(rax, Address(rsp, ld_off));
640 __ movptr(Address(rsp, st_off), rax);
641
642 } else {
643
644 __ movq(rax, Address(rsp, ld_off));
645
646 // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG
647 // T_DOUBLE and T_LONG use two slots in the interpreter
648 if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
649 // ld_off == LSW, ld_off+wordSize == MSW
650 // st_off == MSW, next_off == LSW
651 __ movq(Address(rsp, next_off), rax);
652 #ifdef ASSERT
653 // Overwrite the unused slot with known junk
654 __ mov64(rax, CONST64(0xdeadffffdeadaaaa));
655 __ movptr(Address(rsp, st_off), rax);
656 #endif /* ASSERT */
657 } else {
658 __ movq(Address(rsp, st_off), rax);
659 }
660 }
661 } else if (r_1->is_Register()) {
662 Register r = r_1->as_Register();
663 if (!r_2->is_valid()) {
664 // must be only an int (or less ) so move only 32bits to slot
665 // why not sign extend??
666 __ movl(Address(rsp, st_off), r);
667 } else {
668 // Two VMREgs|OptoRegs can be T_OBJECT, T_ADDRESS, T_DOUBLE, T_LONG
669 // T_DOUBLE and T_LONG use two slots in the interpreter
670 if ( sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
671 // long/double in gpr
672 #ifdef ASSERT
673 // Overwrite the unused slot with known junk
674 __ mov64(rax, CONST64(0xdeadffffdeadaaab));
675 __ movptr(Address(rsp, st_off), rax);
676 #endif /* ASSERT */
677 __ movq(Address(rsp, next_off), r);
678 } else {
679 __ movptr(Address(rsp, st_off), r);
680 }
681 }
682 } else {
683 assert(r_1->is_XMMRegister(), "");
684 if (!r_2->is_valid()) {
685 // only a float use just part of the slot
686 __ movflt(Address(rsp, st_off), r_1->as_XMMRegister());
687 } else {
688 #ifdef ASSERT
689 // Overwrite the unused slot with known junk
690 __ mov64(rax, CONST64(0xdeadffffdeadaaac));
691 __ movptr(Address(rsp, st_off), rax);
692 #endif /* ASSERT */
693 __ movdbl(Address(rsp, next_off), r_1->as_XMMRegister());
694 }
695 }
696 }
697
698 // Schedule the branch target address early.
699 __ movptr(rcx, Address(rbx, in_bytes(Method::interpreter_entry_offset())));
700 __ jmp(rcx);
701 }
702
703 static void range_check(MacroAssembler* masm, Register pc_reg, Register temp_reg,
704 address code_start, address code_end,
705 Label& L_ok) {
706 Label L_fail;
707 __ lea(temp_reg, ExternalAddress(code_start));
708 __ cmpptr(pc_reg, temp_reg);
709 __ jcc(Assembler::belowEqual, L_fail);
710 __ lea(temp_reg, ExternalAddress(code_end));
711 __ cmpptr(pc_reg, temp_reg);
712 __ jcc(Assembler::below, L_ok);
713 __ bind(L_fail);
714 }
715
716 void SharedRuntime::gen_i2c_adapter(MacroAssembler *masm,
717 int total_args_passed,
718 int comp_args_on_stack,
719 const BasicType *sig_bt,
720 const VMRegPair *regs) {
721
722 // Note: r13 contains the senderSP on entry. We must preserve it since
723 // we may do a i2c -> c2i transition if we lose a race where compiled
724 // code goes non-entrant while we get args ready.
725 // In addition we use r13 to locate all the interpreter args as
726 // we must align the stack to 16 bytes on an i2c entry else we
727 // lose alignment we expect in all compiled code and register
728 // save code can segv when fxsave instructions find improperly
729 // aligned stack pointer.
730
731 // Adapters can be frameless because they do not require the caller
732 // to perform additional cleanup work, such as correcting the stack pointer.
733 // An i2c adapter is frameless because the *caller* frame, which is interpreted,
734 // routinely repairs its own stack pointer (from interpreter_frame_last_sp),
735 // even if a callee has modified the stack pointer.
736 // A c2i adapter is frameless because the *callee* frame, which is interpreted,
737 // routinely repairs its caller's stack pointer (from sender_sp, which is set
738 // up via the senderSP register).
739 // In other words, if *either* the caller or callee is interpreted, we can
740 // get the stack pointer repaired after a call.
741 // This is why c2i and i2c adapters cannot be indefinitely composed.
742 // In particular, if a c2i adapter were to somehow call an i2c adapter,
743 // both caller and callee would be compiled methods, and neither would
744 // clean up the stack pointer changes performed by the two adapters.
745 // If this happens, control eventually transfers back to the compiled
746 // caller, but with an uncorrected stack, causing delayed havoc.
747
748 // Pick up the return address
749 __ movptr(rax, Address(rsp, 0));
750
751 if (VerifyAdapterCalls &&
752 (Interpreter::code() != NULL || StubRoutines::code1() != NULL)) {
753 // So, let's test for cascading c2i/i2c adapters right now.
754 // assert(Interpreter::contains($return_addr) ||
755 // StubRoutines::contains($return_addr),
756 // "i2c adapter must return to an interpreter frame");
757 __ block_comment("verify_i2c { ");
758 Label L_ok;
759 if (Interpreter::code() != NULL)
760 range_check(masm, rax, r11,
761 Interpreter::code()->code_start(), Interpreter::code()->code_end(),
762 L_ok);
763 if (StubRoutines::code1() != NULL)
764 range_check(masm, rax, r11,
765 StubRoutines::code1()->code_begin(), StubRoutines::code1()->code_end(),
766 L_ok);
767 if (StubRoutines::code2() != NULL)
768 range_check(masm, rax, r11,
769 StubRoutines::code2()->code_begin(), StubRoutines::code2()->code_end(),
770 L_ok);
771 const char* msg = "i2c adapter must return to an interpreter frame";
772 __ block_comment(msg);
773 __ stop(msg);
774 __ bind(L_ok);
775 __ block_comment("} verify_i2ce ");
776 }
777
778 // Must preserve original SP for loading incoming arguments because
779 // we need to align the outgoing SP for compiled code.
780 __ movptr(r11, rsp);
781
782 // Cut-out for having no stack args. Since up to 2 int/oop args are passed
783 // in registers, we will occasionally have no stack args.
784 int comp_words_on_stack = 0;
785 if (comp_args_on_stack) {
786 // Sig words on the stack are greater-than VMRegImpl::stack0. Those in
787 // registers are below. By subtracting stack0, we either get a negative
788 // number (all values in registers) or the maximum stack slot accessed.
789
790 // Convert 4-byte c2 stack slots to words.
791 comp_words_on_stack = align_up(comp_args_on_stack*VMRegImpl::stack_slot_size, wordSize)>>LogBytesPerWord;
792 // Round up to miminum stack alignment, in wordSize
793 comp_words_on_stack = align_up(comp_words_on_stack, 2);
794 __ subptr(rsp, comp_words_on_stack * wordSize);
795 }
796
797
798 // Ensure compiled code always sees stack at proper alignment
799 __ andptr(rsp, -16);
800
801 // push the return address and misalign the stack that youngest frame always sees
802 // as far as the placement of the call instruction
803 __ push(rax);
804
805 // Put saved SP in another register
806 const Register saved_sp = rax;
807 __ movptr(saved_sp, r11);
808
809 // Will jump to the compiled code just as if compiled code was doing it.
810 // Pre-load the register-jump target early, to schedule it better.
811 __ movptr(r11, Address(rbx, in_bytes(Method::from_compiled_offset())));
812
813 #if INCLUDE_JVMCI
814 if (EnableJVMCI || UseAOT) {
815 // check if this call should be routed towards a specific entry point
816 __ cmpptr(Address(r15_thread, in_bytes(JavaThread::jvmci_alternate_call_target_offset())), 0);
817 Label no_alternative_target;
818 __ jcc(Assembler::equal, no_alternative_target);
819 __ movptr(r11, Address(r15_thread, in_bytes(JavaThread::jvmci_alternate_call_target_offset())));
820 __ movptr(Address(r15_thread, in_bytes(JavaThread::jvmci_alternate_call_target_offset())), 0);
821 __ bind(no_alternative_target);
822 }
823 #endif // INCLUDE_JVMCI
824
825 // Now generate the shuffle code. Pick up all register args and move the
826 // rest through the floating point stack top.
827 for (int i = 0; i < total_args_passed; i++) {
828 if (sig_bt[i] == T_VOID) {
829 // Longs and doubles are passed in native word order, but misaligned
830 // in the 32-bit build.
831 assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half");
832 continue;
833 }
834
835 // Pick up 0, 1 or 2 words from SP+offset.
836
837 assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(),
838 "scrambled load targets?");
839 // Load in argument order going down.
840 int ld_off = (total_args_passed - i)*Interpreter::stackElementSize;
841 // Point to interpreter value (vs. tag)
842 int next_off = ld_off - Interpreter::stackElementSize;
843 //
844 //
845 //
846 VMReg r_1 = regs[i].first();
847 VMReg r_2 = regs[i].second();
848 if (!r_1->is_valid()) {
849 assert(!r_2->is_valid(), "");
850 continue;
851 }
852 if (r_1->is_stack()) {
853 // Convert stack slot to an SP offset (+ wordSize to account for return address )
854 int st_off = regs[i].first()->reg2stack()*VMRegImpl::stack_slot_size + wordSize;
855
856 // We can use r13 as a temp here because compiled code doesn't need r13 as an input
857 // and if we end up going thru a c2i because of a miss a reasonable value of r13
858 // will be generated.
859 if (!r_2->is_valid()) {
860 // sign extend???
861 __ movl(r13, Address(saved_sp, ld_off));
862 __ movptr(Address(rsp, st_off), r13);
863 } else {
864 //
865 // We are using two optoregs. This can be either T_OBJECT, T_ADDRESS, T_LONG, or T_DOUBLE
866 // the interpreter allocates two slots but only uses one for thr T_LONG or T_DOUBLE case
867 // So we must adjust where to pick up the data to match the interpreter.
868 //
869 // Interpreter local[n] == MSW, local[n+1] == LSW however locals
870 // are accessed as negative so LSW is at LOW address
871
872 // ld_off is MSW so get LSW
873 const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)?
874 next_off : ld_off;
875 __ movq(r13, Address(saved_sp, offset));
876 // st_off is LSW (i.e. reg.first())
877 __ movq(Address(rsp, st_off), r13);
878 }
879 } else if (r_1->is_Register()) { // Register argument
880 Register r = r_1->as_Register();
881 assert(r != rax, "must be different");
882 if (r_2->is_valid()) {
883 //
884 // We are using two VMRegs. This can be either T_OBJECT, T_ADDRESS, T_LONG, or T_DOUBLE
885 // the interpreter allocates two slots but only uses one for thr T_LONG or T_DOUBLE case
886 // So we must adjust where to pick up the data to match the interpreter.
887
888 const int offset = (sig_bt[i]==T_LONG||sig_bt[i]==T_DOUBLE)?
889 next_off : ld_off;
890
891 // this can be a misaligned move
892 __ movq(r, Address(saved_sp, offset));
893 } else {
894 // sign extend and use a full word?
895 __ movl(r, Address(saved_sp, ld_off));
896 }
897 } else {
898 if (!r_2->is_valid()) {
899 __ movflt(r_1->as_XMMRegister(), Address(saved_sp, ld_off));
900 } else {
901 __ movdbl(r_1->as_XMMRegister(), Address(saved_sp, next_off));
902 }
903 }
904 }
905
906 // 6243940 We might end up in handle_wrong_method if
907 // the callee is deoptimized as we race thru here. If that
908 // happens we don't want to take a safepoint because the
909 // caller frame will look interpreted and arguments are now
910 // "compiled" so it is much better to make this transition
911 // invisible to the stack walking code. Unfortunately if
912 // we try and find the callee by normal means a safepoint
913 // is possible. So we stash the desired callee in the thread
914 // and the vm will find there should this case occur.
915
916 __ movptr(Address(r15_thread, JavaThread::callee_target_offset()), rbx);
917
918 // put Method* where a c2i would expect should we end up there
919 // only needed becaus eof c2 resolve stubs return Method* as a result in
920 // rax
921 __ mov(rax, rbx);
922 __ jmp(r11);
923 }
924
925 // ---------------------------------------------------------------
926 AdapterHandlerEntry* SharedRuntime::generate_i2c2i_adapters(MacroAssembler *masm,
927 int total_args_passed,
928 int comp_args_on_stack,
929 const BasicType *sig_bt,
930 const VMRegPair *regs,
931 AdapterFingerPrint* fingerprint) {
932 address i2c_entry = __ pc();
933
934 gen_i2c_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs);
935
936 // -------------------------------------------------------------------------
937 // Generate a C2I adapter. On entry we know rbx holds the Method* during calls
938 // to the interpreter. The args start out packed in the compiled layout. They
939 // need to be unpacked into the interpreter layout. This will almost always
940 // require some stack space. We grow the current (compiled) stack, then repack
941 // the args. We finally end in a jump to the generic interpreter entry point.
942 // On exit from the interpreter, the interpreter will restore our SP (lest the
943 // compiled code, which relys solely on SP and not RBP, get sick).
944
945 address c2i_unverified_entry = __ pc();
946 Label skip_fixup;
947 Label ok;
948
949 Register holder = rax;
950 Register receiver = j_rarg0;
951 Register temp = rbx;
952
953 {
954 __ load_klass(temp, receiver);
955 __ cmpptr(temp, Address(holder, CompiledICHolder::holder_klass_offset()));
956 __ movptr(rbx, Address(holder, CompiledICHolder::holder_metadata_offset()));
957 __ jcc(Assembler::equal, ok);
958 __ jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
959
960 __ bind(ok);
961 // Method might have been compiled since the call site was patched to
962 // interpreted if that is the case treat it as a miss so we can get
963 // the call site corrected.
964 __ cmpptr(Address(rbx, in_bytes(Method::code_offset())), (int32_t)NULL_WORD);
965 __ jcc(Assembler::equal, skip_fixup);
966 __ jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
967 }
968
969 address c2i_entry = __ pc();
970
971 gen_c2i_adapter(masm, total_args_passed, comp_args_on_stack, sig_bt, regs, skip_fixup);
972
973 __ flush();
974 return AdapterHandlerLibrary::new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
975 }
976
977 int SharedRuntime::c_calling_convention(const BasicType *sig_bt,
978 VMRegPair *regs,
979 VMRegPair *regs2,
980 int total_args_passed) {
981 assert(regs2 == NULL, "not needed on x86");
982 // We return the amount of VMRegImpl stack slots we need to reserve for all
983 // the arguments NOT counting out_preserve_stack_slots.
984
985 // NOTE: These arrays will have to change when c1 is ported
986 #ifdef _WIN64
987 static const Register INT_ArgReg[Argument::n_int_register_parameters_c] = {
988 c_rarg0, c_rarg1, c_rarg2, c_rarg3
989 };
990 static const XMMRegister FP_ArgReg[Argument::n_float_register_parameters_c] = {
991 c_farg0, c_farg1, c_farg2, c_farg3
992 };
993 #else
994 static const Register INT_ArgReg[Argument::n_int_register_parameters_c] = {
995 c_rarg0, c_rarg1, c_rarg2, c_rarg3, c_rarg4, c_rarg5
996 };
997 static const XMMRegister FP_ArgReg[Argument::n_float_register_parameters_c] = {
998 c_farg0, c_farg1, c_farg2, c_farg3,
999 c_farg4, c_farg5, c_farg6, c_farg7
1000 };
1001 #endif // _WIN64
1002
1003
1004 uint int_args = 0;
1005 uint fp_args = 0;
1006 uint stk_args = 0; // inc by 2 each time
1007
1008 for (int i = 0; i < total_args_passed; i++) {
1009 switch (sig_bt[i]) {
1010 case T_BOOLEAN:
1011 case T_CHAR:
1012 case T_BYTE:
1013 case T_SHORT:
1014 case T_INT:
1015 if (int_args < Argument::n_int_register_parameters_c) {
1016 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg());
1017 #ifdef _WIN64
1018 fp_args++;
1019 // Allocate slots for callee to stuff register args the stack.
1020 stk_args += 2;
1021 #endif
1022 } else {
1023 regs[i].set1(VMRegImpl::stack2reg(stk_args));
1024 stk_args += 2;
1025 }
1026 break;
1027 case T_LONG:
1028 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
1029 // fall through
1030 case T_OBJECT:
1031 case T_ARRAY:
1032 case T_ADDRESS:
1033 case T_METADATA:
1034 if (int_args < Argument::n_int_register_parameters_c) {
1035 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg());
1036 #ifdef _WIN64
1037 fp_args++;
1038 stk_args += 2;
1039 #endif
1040 } else {
1041 regs[i].set2(VMRegImpl::stack2reg(stk_args));
1042 stk_args += 2;
1043 }
1044 break;
1045 case T_FLOAT:
1046 if (fp_args < Argument::n_float_register_parameters_c) {
1047 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg());
1048 #ifdef _WIN64
1049 int_args++;
1050 // Allocate slots for callee to stuff register args the stack.
1051 stk_args += 2;
1052 #endif
1053 } else {
1054 regs[i].set1(VMRegImpl::stack2reg(stk_args));
1055 stk_args += 2;
1056 }
1057 break;
1058 case T_DOUBLE:
1059 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
1060 if (fp_args < Argument::n_float_register_parameters_c) {
1061 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg());
1062 #ifdef _WIN64
1063 int_args++;
1064 // Allocate slots for callee to stuff register args the stack.
1065 stk_args += 2;
1066 #endif
1067 } else {
1068 regs[i].set2(VMRegImpl::stack2reg(stk_args));
1069 stk_args += 2;
1070 }
1071 break;
1072 case T_VOID: // Halves of longs and doubles
1073 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half");
1074 regs[i].set_bad();
1075 break;
1076 default:
1077 ShouldNotReachHere();
1078 break;
1079 }
1080 }
1081 #ifdef _WIN64
1082 // windows abi requires that we always allocate enough stack space
1083 // for 4 64bit registers to be stored down.
1084 if (stk_args < 8) {
1085 stk_args = 8;
1086 }
1087 #endif // _WIN64
1088
1089 return stk_args;
1090 }
1091
1092 // On 64 bit we will store integer like items to the stack as
1093 // 64 bits items (sparc abi) even though java would only store
1094 // 32bits for a parameter. On 32bit it will simply be 32 bits
1095 // So this routine will do 32->32 on 32bit and 32->64 on 64bit
1096 static void move32_64(MacroAssembler* masm, VMRegPair src, VMRegPair dst) {
1097 if (src.first()->is_stack()) {
1098 if (dst.first()->is_stack()) {
1099 // stack to stack
1100 __ movslq(rax, Address(rbp, reg2offset_in(src.first())));
1101 __ movq(Address(rsp, reg2offset_out(dst.first())), rax);
1102 } else {
1103 // stack to reg
1104 __ movslq(dst.first()->as_Register(), Address(rbp, reg2offset_in(src.first())));
1105 }
1106 } else if (dst.first()->is_stack()) {
1107 // reg to stack
1108 // Do we really have to sign extend???
1109 // __ movslq(src.first()->as_Register(), src.first()->as_Register());
1110 __ movq(Address(rsp, reg2offset_out(dst.first())), src.first()->as_Register());
1111 } else {
1112 // Do we really have to sign extend???
1113 // __ movslq(dst.first()->as_Register(), src.first()->as_Register());
1114 if (dst.first() != src.first()) {
1115 __ movq(dst.first()->as_Register(), src.first()->as_Register());
1116 }
1117 }
1118 }
1119
1120 static void move_ptr(MacroAssembler* masm, VMRegPair src, VMRegPair dst) {
1121 if (src.first()->is_stack()) {
1122 if (dst.first()->is_stack()) {
1123 // stack to stack
1124 __ movq(rax, Address(rbp, reg2offset_in(src.first())));
1125 __ movq(Address(rsp, reg2offset_out(dst.first())), rax);
1126 } else {
1127 // stack to reg
1128 __ movq(dst.first()->as_Register(), Address(rbp, reg2offset_in(src.first())));
1129 }
1130 } else if (dst.first()->is_stack()) {
1131 // reg to stack
1132 __ movq(Address(rsp, reg2offset_out(dst.first())), src.first()->as_Register());
1133 } else {
1134 if (dst.first() != src.first()) {
1135 __ movq(dst.first()->as_Register(), src.first()->as_Register());
1136 }
1137 }
1138 }
1139
1140 // An oop arg. Must pass a handle not the oop itself
1141 static void object_move(MacroAssembler* masm,
1142 OopMap* map,
1143 int oop_handle_offset,
1144 int framesize_in_slots,
1145 VMRegPair src,
1146 VMRegPair dst,
1147 bool is_receiver,
1148 int* receiver_offset) {
1149
1150 // must pass a handle. First figure out the location we use as a handle
1151
1152 Register rHandle = dst.first()->is_stack() ? rax : dst.first()->as_Register();
1153
1154 // See if oop is NULL if it is we need no handle
1155
1156 if (src.first()->is_stack()) {
1157
1158 // Oop is already on the stack as an argument
1159 int offset_in_older_frame = src.first()->reg2stack() + SharedRuntime::out_preserve_stack_slots();
1160 map->set_oop(VMRegImpl::stack2reg(offset_in_older_frame + framesize_in_slots));
1161 if (is_receiver) {
1162 *receiver_offset = (offset_in_older_frame + framesize_in_slots) * VMRegImpl::stack_slot_size;
1163 }
1164
1165 __ cmpptr(Address(rbp, reg2offset_in(src.first())), (int32_t)NULL_WORD);
1166 __ lea(rHandle, Address(rbp, reg2offset_in(src.first())));
1167 // conditionally move a NULL
1168 __ cmovptr(Assembler::equal, rHandle, Address(rbp, reg2offset_in(src.first())));
1169 } else {
1170
1171 // Oop is in an a register we must store it to the space we reserve
1172 // on the stack for oop_handles and pass a handle if oop is non-NULL
1173
1174 const Register rOop = src.first()->as_Register();
1175 int oop_slot;
1176 if (rOop == j_rarg0)
1177 oop_slot = 0;
1178 else if (rOop == j_rarg1)
1179 oop_slot = 1;
1180 else if (rOop == j_rarg2)
1181 oop_slot = 2;
1182 else if (rOop == j_rarg3)
1183 oop_slot = 3;
1184 else if (rOop == j_rarg4)
1185 oop_slot = 4;
1186 else {
1187 assert(rOop == j_rarg5, "wrong register");
1188 oop_slot = 5;
1189 }
1190
1191 oop_slot = oop_slot * VMRegImpl::slots_per_word + oop_handle_offset;
1192 int offset = oop_slot*VMRegImpl::stack_slot_size;
1193
1194 map->set_oop(VMRegImpl::stack2reg(oop_slot));
1195 // Store oop in handle area, may be NULL
1196 __ movptr(Address(rsp, offset), rOop);
1197 if (is_receiver) {
1198 *receiver_offset = offset;
1199 }
1200
1201 __ cmpptr(rOop, (int32_t)NULL_WORD);
1202 __ lea(rHandle, Address(rsp, offset));
1203 // conditionally move a NULL from the handle area where it was just stored
1204 __ cmovptr(Assembler::equal, rHandle, Address(rsp, offset));
1205 }
1206
1207 // If arg is on the stack then place it otherwise it is already in correct reg.
1208 if (dst.first()->is_stack()) {
1209 __ movptr(Address(rsp, reg2offset_out(dst.first())), rHandle);
1210 }
1211 }
1212
1213 // A float arg may have to do float reg int reg conversion
1214 static void float_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) {
1215 assert(!src.second()->is_valid() && !dst.second()->is_valid(), "bad float_move");
1216
1217 // The calling conventions assures us that each VMregpair is either
1218 // all really one physical register or adjacent stack slots.
1219 // This greatly simplifies the cases here compared to sparc.
1220
1221 if (src.first()->is_stack()) {
1222 if (dst.first()->is_stack()) {
1223 __ movl(rax, Address(rbp, reg2offset_in(src.first())));
1224 __ movptr(Address(rsp, reg2offset_out(dst.first())), rax);
1225 } else {
1226 // stack to reg
1227 assert(dst.first()->is_XMMRegister(), "only expect xmm registers as parameters");
1228 __ movflt(dst.first()->as_XMMRegister(), Address(rbp, reg2offset_in(src.first())));
1229 }
1230 } else if (dst.first()->is_stack()) {
1231 // reg to stack
1232 assert(src.first()->is_XMMRegister(), "only expect xmm registers as parameters");
1233 __ movflt(Address(rsp, reg2offset_out(dst.first())), src.first()->as_XMMRegister());
1234 } else {
1235 // reg to reg
1236 // In theory these overlap but the ordering is such that this is likely a nop
1237 if ( src.first() != dst.first()) {
1238 __ movdbl(dst.first()->as_XMMRegister(), src.first()->as_XMMRegister());
1239 }
1240 }
1241 }
1242
1243 // A long move
1244 static void long_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) {
1245
1246 // The calling conventions assures us that each VMregpair is either
1247 // all really one physical register or adjacent stack slots.
1248 // This greatly simplifies the cases here compared to sparc.
1249
1250 if (src.is_single_phys_reg() ) {
1251 if (dst.is_single_phys_reg()) {
1252 if (dst.first() != src.first()) {
1253 __ mov(dst.first()->as_Register(), src.first()->as_Register());
1254 }
1255 } else {
1256 assert(dst.is_single_reg(), "not a stack pair");
1257 __ movq(Address(rsp, reg2offset_out(dst.first())), src.first()->as_Register());
1258 }
1259 } else if (dst.is_single_phys_reg()) {
1260 assert(src.is_single_reg(), "not a stack pair");
1261 __ movq(dst.first()->as_Register(), Address(rbp, reg2offset_out(src.first())));
1262 } else {
1263 assert(src.is_single_reg() && dst.is_single_reg(), "not stack pairs");
1264 __ movq(rax, Address(rbp, reg2offset_in(src.first())));
1265 __ movq(Address(rsp, reg2offset_out(dst.first())), rax);
1266 }
1267 }
1268
1269 // A double move
1270 static void double_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) {
1271
1272 // The calling conventions assures us that each VMregpair is either
1273 // all really one physical register or adjacent stack slots.
1274 // This greatly simplifies the cases here compared to sparc.
1275
1276 if (src.is_single_phys_reg() ) {
1277 if (dst.is_single_phys_reg()) {
1278 // In theory these overlap but the ordering is such that this is likely a nop
1279 if ( src.first() != dst.first()) {
1280 __ movdbl(dst.first()->as_XMMRegister(), src.first()->as_XMMRegister());
1281 }
1282 } else {
1283 assert(dst.is_single_reg(), "not a stack pair");
1284 __ movdbl(Address(rsp, reg2offset_out(dst.first())), src.first()->as_XMMRegister());
1285 }
1286 } else if (dst.is_single_phys_reg()) {
1287 assert(src.is_single_reg(), "not a stack pair");
1288 __ movdbl(dst.first()->as_XMMRegister(), Address(rbp, reg2offset_out(src.first())));
1289 } else {
1290 assert(src.is_single_reg() && dst.is_single_reg(), "not stack pairs");
1291 __ movq(rax, Address(rbp, reg2offset_in(src.first())));
1292 __ movq(Address(rsp, reg2offset_out(dst.first())), rax);
1293 }
1294 }
1295
1296
1297 void SharedRuntime::save_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
1298 // We always ignore the frame_slots arg and just use the space just below frame pointer
1299 // which by this time is free to use
1300 switch (ret_type) {
1301 case T_FLOAT:
1302 __ movflt(Address(rbp, -wordSize), xmm0);
1303 break;
1304 case T_DOUBLE:
1305 __ movdbl(Address(rbp, -wordSize), xmm0);
1306 break;
1307 case T_VOID: break;
1308 default: {
1309 __ movptr(Address(rbp, -wordSize), rax);
1310 }
1311 }
1312 }
1313
1314 void SharedRuntime::restore_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
1315 // We always ignore the frame_slots arg and just use the space just below frame pointer
1316 // which by this time is free to use
1317 switch (ret_type) {
1318 case T_FLOAT:
1319 __ movflt(xmm0, Address(rbp, -wordSize));
1320 break;
1321 case T_DOUBLE:
1322 __ movdbl(xmm0, Address(rbp, -wordSize));
1323 break;
1324 case T_VOID: break;
1325 default: {
1326 __ movptr(rax, Address(rbp, -wordSize));
1327 }
1328 }
1329 }
1330
1331 static void save_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) {
1332 for ( int i = first_arg ; i < arg_count ; i++ ) {
1333 if (args[i].first()->is_Register()) {
1334 __ push(args[i].first()->as_Register());
1335 } else if (args[i].first()->is_XMMRegister()) {
1336 __ subptr(rsp, 2*wordSize);
1337 __ movdbl(Address(rsp, 0), args[i].first()->as_XMMRegister());
1338 }
1339 }
1340 }
1341
1342 static void restore_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) {
1343 for ( int i = arg_count - 1 ; i >= first_arg ; i-- ) {
1344 if (args[i].first()->is_Register()) {
1345 __ pop(args[i].first()->as_Register());
1346 } else if (args[i].first()->is_XMMRegister()) {
1347 __ movdbl(args[i].first()->as_XMMRegister(), Address(rsp, 0));
1348 __ addptr(rsp, 2*wordSize);
1349 }
1350 }
1351 }
1352
1353
1354 static void save_or_restore_arguments(MacroAssembler* masm,
1355 const int stack_slots,
1356 const int total_in_args,
1357 const int arg_save_area,
1358 OopMap* map,
1359 VMRegPair* in_regs,
1360 BasicType* in_sig_bt) {
1361 // if map is non-NULL then the code should store the values,
1362 // otherwise it should load them.
1363 int slot = arg_save_area;
1364 // Save down double word first
1365 for ( int i = 0; i < total_in_args; i++) {
1366 if (in_regs[i].first()->is_XMMRegister() && in_sig_bt[i] == T_DOUBLE) {
1367 int offset = slot * VMRegImpl::stack_slot_size;
1368 slot += VMRegImpl::slots_per_word;
1369 assert(slot <= stack_slots, "overflow");
1370 if (map != NULL) {
1371 __ movdbl(Address(rsp, offset), in_regs[i].first()->as_XMMRegister());
1372 } else {
1373 __ movdbl(in_regs[i].first()->as_XMMRegister(), Address(rsp, offset));
1374 }
1375 }
1376 if (in_regs[i].first()->is_Register() &&
1377 (in_sig_bt[i] == T_LONG || in_sig_bt[i] == T_ARRAY)) {
1378 int offset = slot * VMRegImpl::stack_slot_size;
1379 if (map != NULL) {
1380 __ movq(Address(rsp, offset), in_regs[i].first()->as_Register());
1381 if (in_sig_bt[i] == T_ARRAY) {
1382 map->set_oop(VMRegImpl::stack2reg(slot));;
1383 }
1384 } else {
1385 __ movq(in_regs[i].first()->as_Register(), Address(rsp, offset));
1386 }
1387 slot += VMRegImpl::slots_per_word;
1388 }
1389 }
1390 // Save or restore single word registers
1391 for ( int i = 0; i < total_in_args; i++) {
1392 if (in_regs[i].first()->is_Register()) {
1393 int offset = slot * VMRegImpl::stack_slot_size;
1394 slot++;
1395 assert(slot <= stack_slots, "overflow");
1396
1397 // Value is in an input register pass we must flush it to the stack
1398 const Register reg = in_regs[i].first()->as_Register();
1399 switch (in_sig_bt[i]) {
1400 case T_BOOLEAN:
1401 case T_CHAR:
1402 case T_BYTE:
1403 case T_SHORT:
1404 case T_INT:
1405 if (map != NULL) {
1406 __ movl(Address(rsp, offset), reg);
1407 } else {
1408 __ movl(reg, Address(rsp, offset));
1409 }
1410 break;
1411 case T_ARRAY:
1412 case T_LONG:
1413 // handled above
1414 break;
1415 case T_OBJECT:
1416 default: ShouldNotReachHere();
1417 }
1418 } else if (in_regs[i].first()->is_XMMRegister()) {
1419 if (in_sig_bt[i] == T_FLOAT) {
1420 int offset = slot * VMRegImpl::stack_slot_size;
1421 slot++;
1422 assert(slot <= stack_slots, "overflow");
1423 if (map != NULL) {
1424 __ movflt(Address(rsp, offset), in_regs[i].first()->as_XMMRegister());
1425 } else {
1426 __ movflt(in_regs[i].first()->as_XMMRegister(), Address(rsp, offset));
1427 }
1428 }
1429 } else if (in_regs[i].first()->is_stack()) {
1430 if (in_sig_bt[i] == T_ARRAY && map != NULL) {
1431 int offset_in_older_frame = in_regs[i].first()->reg2stack() + SharedRuntime::out_preserve_stack_slots();
1432 map->set_oop(VMRegImpl::stack2reg(offset_in_older_frame + stack_slots));
1433 }
1434 }
1435 }
1436 }
1437
1438 // Pin incoming array argument of java critical method
1439 static void pin_critical_native_array(MacroAssembler* masm,
1440 VMRegPair reg,
1441 int& pinned_slot) {
1442 __ block_comment("pin_critical_native_array {");
1443 Register tmp_reg = rax;
1444
1445 Label is_null;
1446 VMRegPair tmp;
1447 VMRegPair in_reg = reg;
1448 bool on_stack = false;
1449
1450 tmp.set_ptr(tmp_reg->as_VMReg());
1451 if (reg.first()->is_stack()) {
1452 // Load the arg up from the stack
1453 move_ptr(masm, reg, tmp);
1454 reg = tmp;
1455 on_stack = true;
1456 } else {
1457 __ movptr(rax, reg.first()->as_Register());
1458 }
1459 __ testptr(reg.first()->as_Register(), reg.first()->as_Register());
1460 __ jccb(Assembler::equal, is_null);
1461
1462 __ push(c_rarg0);
1463 __ push(c_rarg1);
1464 __ push(c_rarg2);
1465 __ push(c_rarg3);
1466 #ifdef _WIN64
1467 // caller-saved registers on Windows
1468 __ push(r10);
1469 __ push(r11);
1470 #else
1471 __ push(c_rarg4);
1472 __ push(c_rarg5);
1473 #endif
1474
1475 if (reg.first()->as_Register() != c_rarg1) {
1476 __ movptr(c_rarg1, reg.first()->as_Register());
1477 }
1478 __ movptr(c_rarg0, r15_thread);
1479 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::pin_object)));
1480
1481 #ifdef _WIN64
1482 __ pop(r11);
1483 __ pop(r10);
1484 #else
1485 __ pop(c_rarg5);
1486 __ pop(c_rarg4);
1487 #endif
1488 __ pop(c_rarg3);
1489 __ pop(c_rarg2);
1490 __ pop(c_rarg1);
1491 __ pop(c_rarg0);
1492
1493 if (on_stack) {
1494 __ movptr(Address(rbp, reg2offset_in(in_reg.first())), rax);
1495 __ bind(is_null);
1496 } else {
1497 __ movptr(reg.first()->as_Register(), rax);
1498
1499 // save on stack for unpinning later
1500 __ bind(is_null);
1501 assert(reg.first()->is_Register(), "Must be a register");
1502 int offset = pinned_slot * VMRegImpl::stack_slot_size;
1503 pinned_slot += VMRegImpl::slots_per_word;
1504 __ movq(Address(rsp, offset), rax);
1505 }
1506 __ block_comment("} pin_critical_native_array");
1507 }
1508
1509 // Unpin array argument of java critical method
1510 static void unpin_critical_native_array(MacroAssembler* masm,
1511 VMRegPair reg,
1512 int& pinned_slot) {
1513 __ block_comment("unpin_critical_native_array {");
1514 Label is_null;
1515
1516 if (reg.first()->is_stack()) {
1517 __ movptr(c_rarg1, Address(rbp, reg2offset_in(reg.first())));
1518 } else {
1519 int offset = pinned_slot * VMRegImpl::stack_slot_size;
1520 pinned_slot += VMRegImpl::slots_per_word;
1521 __ movq(c_rarg1, Address(rsp, offset));
1522 }
1523 __ testptr(c_rarg1, c_rarg1);
1524 __ jccb(Assembler::equal, is_null);
1525
1526 __ movptr(c_rarg0, r15_thread);
1527 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::unpin_object)));
1528
1529 __ bind(is_null);
1530 __ block_comment("} unpin_critical_native_array");
1531 }
1532
1533 // Check GCLocker::needs_gc and enter the runtime if it's true. This
1534 // keeps a new JNI critical region from starting until a GC has been
1535 // forced. Save down any oops in registers and describe them in an
1536 // OopMap.
1537 static void check_needs_gc_for_critical_native(MacroAssembler* masm,
1538 int stack_slots,
1539 int total_c_args,
1540 int total_in_args,
1541 int arg_save_area,
1542 OopMapSet* oop_maps,
1543 VMRegPair* in_regs,
1544 BasicType* in_sig_bt) {
1545 __ block_comment("check GCLocker::needs_gc");
1546 Label cont;
1547 __ cmp8(ExternalAddress((address)GCLocker::needs_gc_address()), false);
1548 __ jcc(Assembler::equal, cont);
1549
1550 // Save down any incoming oops and call into the runtime to halt for a GC
1551
1552 OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/);
1553 save_or_restore_arguments(masm, stack_slots, total_in_args,
1554 arg_save_area, map, in_regs, in_sig_bt);
1555
1556 address the_pc = __ pc();
1557 oop_maps->add_gc_map( __ offset(), map);
1558 __ set_last_Java_frame(rsp, noreg, the_pc);
1559
1560 __ block_comment("block_for_jni_critical");
1561 __ movptr(c_rarg0, r15_thread);
1562 __ mov(r12, rsp); // remember sp
1563 __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows
1564 __ andptr(rsp, -16); // align stack as required by ABI
1565 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::block_for_jni_critical)));
1566 __ mov(rsp, r12); // restore sp
1567 __ reinit_heapbase();
1568
1569 __ reset_last_Java_frame(false);
1570
1571 save_or_restore_arguments(masm, stack_slots, total_in_args,
1572 arg_save_area, NULL, in_regs, in_sig_bt);
1573 __ bind(cont);
1574 #ifdef ASSERT
1575 if (StressCriticalJNINatives) {
1576 // Stress register saving
1577 OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/);
1578 save_or_restore_arguments(masm, stack_slots, total_in_args,
1579 arg_save_area, map, in_regs, in_sig_bt);
1580 // Destroy argument registers
1581 for (int i = 0; i < total_in_args - 1; i++) {
1582 if (in_regs[i].first()->is_Register()) {
1583 const Register reg = in_regs[i].first()->as_Register();
1584 __ xorptr(reg, reg);
1585 } else if (in_regs[i].first()->is_XMMRegister()) {
1586 __ xorpd(in_regs[i].first()->as_XMMRegister(), in_regs[i].first()->as_XMMRegister());
1587 } else if (in_regs[i].first()->is_FloatRegister()) {
1588 ShouldNotReachHere();
1589 } else if (in_regs[i].first()->is_stack()) {
1590 // Nothing to do
1591 } else {
1592 ShouldNotReachHere();
1593 }
1594 if (in_sig_bt[i] == T_LONG || in_sig_bt[i] == T_DOUBLE) {
1595 i++;
1596 }
1597 }
1598
1599 save_or_restore_arguments(masm, stack_slots, total_in_args,
1600 arg_save_area, NULL, in_regs, in_sig_bt);
1601 }
1602 #endif
1603 }
1604
1605 // Unpack an array argument into a pointer to the body and the length
1606 // if the array is non-null, otherwise pass 0 for both.
1607 static void unpack_array_argument(MacroAssembler* masm, VMRegPair reg, BasicType in_elem_type, VMRegPair body_arg, VMRegPair length_arg) {
1608 Register tmp_reg = rax;
1609 assert(!body_arg.first()->is_Register() || body_arg.first()->as_Register() != tmp_reg,
1610 "possible collision");
1611 assert(!length_arg.first()->is_Register() || length_arg.first()->as_Register() != tmp_reg,
1612 "possible collision");
1613
1614 __ block_comment("unpack_array_argument {");
1615
1616 // Pass the length, ptr pair
1617 Label is_null, done;
1618 VMRegPair tmp;
1619 tmp.set_ptr(tmp_reg->as_VMReg());
1620 if (reg.first()->is_stack()) {
1621 // Load the arg up from the stack
1622 move_ptr(masm, reg, tmp);
1623 reg = tmp;
1624 }
1625 __ testptr(reg.first()->as_Register(), reg.first()->as_Register());
1626 __ jccb(Assembler::equal, is_null);
1627 __ lea(tmp_reg, Address(reg.first()->as_Register(), arrayOopDesc::base_offset_in_bytes(in_elem_type)));
1628 move_ptr(masm, tmp, body_arg);
1629 // load the length relative to the body.
1630 __ movl(tmp_reg, Address(tmp_reg, arrayOopDesc::length_offset_in_bytes() -
1631 arrayOopDesc::base_offset_in_bytes(in_elem_type)));
1632 move32_64(masm, tmp, length_arg);
1633 __ jmpb(done);
1634 __ bind(is_null);
1635 // Pass zeros
1636 __ xorptr(tmp_reg, tmp_reg);
1637 move_ptr(masm, tmp, body_arg);
1638 move32_64(masm, tmp, length_arg);
1639 __ bind(done);
1640
1641 __ block_comment("} unpack_array_argument");
1642 }
1643
1644
1645 // Different signatures may require very different orders for the move
1646 // to avoid clobbering other arguments. There's no simple way to
1647 // order them safely. Compute a safe order for issuing stores and
1648 // break any cycles in those stores. This code is fairly general but
1649 // it's not necessary on the other platforms so we keep it in the
1650 // platform dependent code instead of moving it into a shared file.
1651 // (See bugs 7013347 & 7145024.)
1652 // Note that this code is specific to LP64.
1653 class ComputeMoveOrder: public StackObj {
1654 class MoveOperation: public ResourceObj {
1655 friend class ComputeMoveOrder;
1656 private:
1657 VMRegPair _src;
1658 VMRegPair _dst;
1659 int _src_index;
1660 int _dst_index;
1661 bool _processed;
1662 MoveOperation* _next;
1663 MoveOperation* _prev;
1664
1665 static int get_id(VMRegPair r) {
1666 return r.first()->value();
1667 }
1668
1669 public:
1670 MoveOperation(int src_index, VMRegPair src, int dst_index, VMRegPair dst):
1671 _src(src)
1672 , _src_index(src_index)
1673 , _dst(dst)
1674 , _dst_index(dst_index)
1675 , _next(NULL)
1676 , _prev(NULL)
1677 , _processed(false) {
1678 }
1679
1680 VMRegPair src() const { return _src; }
1681 int src_id() const { return get_id(src()); }
1682 int src_index() const { return _src_index; }
1683 VMRegPair dst() const { return _dst; }
1684 void set_dst(int i, VMRegPair dst) { _dst_index = i, _dst = dst; }
1685 int dst_index() const { return _dst_index; }
1686 int dst_id() const { return get_id(dst()); }
1687 MoveOperation* next() const { return _next; }
1688 MoveOperation* prev() const { return _prev; }
1689 void set_processed() { _processed = true; }
1690 bool is_processed() const { return _processed; }
1691
1692 // insert
1693 void break_cycle(VMRegPair temp_register) {
1694 // create a new store following the last store
1695 // to move from the temp_register to the original
1696 MoveOperation* new_store = new MoveOperation(-1, temp_register, dst_index(), dst());
1697
1698 // break the cycle of links and insert new_store at the end
1699 // break the reverse link.
1700 MoveOperation* p = prev();
1701 assert(p->next() == this, "must be");
1702 _prev = NULL;
1703 p->_next = new_store;
1704 new_store->_prev = p;
1705
1706 // change the original store to save it's value in the temp.
1707 set_dst(-1, temp_register);
1708 }
1709
1710 void link(GrowableArray<MoveOperation*>& killer) {
1711 // link this store in front the store that it depends on
1712 MoveOperation* n = killer.at_grow(src_id(), NULL);
1713 if (n != NULL) {
1714 assert(_next == NULL && n->_prev == NULL, "shouldn't have been set yet");
1715 _next = n;
1716 n->_prev = this;
1717 }
1718 }
1719 };
1720
1721 private:
1722 GrowableArray<MoveOperation*> edges;
1723
1724 public:
1725 ComputeMoveOrder(int total_in_args, VMRegPair* in_regs, int total_c_args, VMRegPair* out_regs,
1726 BasicType* in_sig_bt, GrowableArray<int>& arg_order, VMRegPair tmp_vmreg) {
1727 // Move operations where the dest is the stack can all be
1728 // scheduled first since they can't interfere with the other moves.
1729 for (int i = total_in_args - 1, c_arg = total_c_args - 1; i >= 0; i--, c_arg--) {
1730 if (in_sig_bt[i] == T_ARRAY) {
1731 c_arg--;
1732 if (out_regs[c_arg].first()->is_stack() &&
1733 out_regs[c_arg + 1].first()->is_stack()) {
1734 arg_order.push(i);
1735 arg_order.push(c_arg);
1736 } else {
1737 if (out_regs[c_arg].first()->is_stack() ||
1738 in_regs[i].first() == out_regs[c_arg].first()) {
1739 add_edge(i, in_regs[i].first(), c_arg, out_regs[c_arg + 1]);
1740 } else {
1741 add_edge(i, in_regs[i].first(), c_arg, out_regs[c_arg]);
1742 }
1743 }
1744 } else if (in_sig_bt[i] == T_VOID) {
1745 arg_order.push(i);
1746 arg_order.push(c_arg);
1747 } else {
1748 if (out_regs[c_arg].first()->is_stack() ||
1749 in_regs[i].first() == out_regs[c_arg].first()) {
1750 arg_order.push(i);
1751 arg_order.push(c_arg);
1752 } else {
1753 add_edge(i, in_regs[i].first(), c_arg, out_regs[c_arg]);
1754 }
1755 }
1756 }
1757 // Break any cycles in the register moves and emit the in the
1758 // proper order.
1759 GrowableArray<MoveOperation*>* stores = get_store_order(tmp_vmreg);
1760 for (int i = 0; i < stores->length(); i++) {
1761 arg_order.push(stores->at(i)->src_index());
1762 arg_order.push(stores->at(i)->dst_index());
1763 }
1764 }
1765
1766 // Collected all the move operations
1767 void add_edge(int src_index, VMRegPair src, int dst_index, VMRegPair dst) {
1768 if (src.first() == dst.first()) return;
1769 edges.append(new MoveOperation(src_index, src, dst_index, dst));
1770 }
1771
1772 // Walk the edges breaking cycles between moves. The result list
1773 // can be walked in order to produce the proper set of loads
1774 GrowableArray<MoveOperation*>* get_store_order(VMRegPair temp_register) {
1775 // Record which moves kill which values
1776 GrowableArray<MoveOperation*> killer;
1777 for (int i = 0; i < edges.length(); i++) {
1778 MoveOperation* s = edges.at(i);
1779 assert(killer.at_grow(s->dst_id(), NULL) == NULL, "only one killer");
1780 killer.at_put_grow(s->dst_id(), s, NULL);
1781 }
1782 assert(killer.at_grow(MoveOperation::get_id(temp_register), NULL) == NULL,
1783 "make sure temp isn't in the registers that are killed");
1784
1785 // create links between loads and stores
1786 for (int i = 0; i < edges.length(); i++) {
1787 edges.at(i)->link(killer);
1788 }
1789
1790 // at this point, all the move operations are chained together
1791 // in a doubly linked list. Processing it backwards finds
1792 // the beginning of the chain, forwards finds the end. If there's
1793 // a cycle it can be broken at any point, so pick an edge and walk
1794 // backward until the list ends or we end where we started.
1795 GrowableArray<MoveOperation*>* stores = new GrowableArray<MoveOperation*>();
1796 for (int e = 0; e < edges.length(); e++) {
1797 MoveOperation* s = edges.at(e);
1798 if (!s->is_processed()) {
1799 MoveOperation* start = s;
1800 // search for the beginning of the chain or cycle
1801 while (start->prev() != NULL && start->prev() != s) {
1802 start = start->prev();
1803 }
1804 if (start->prev() == s) {
1805 start->break_cycle(temp_register);
1806 }
1807 // walk the chain forward inserting to store list
1808 while (start != NULL) {
1809 stores->append(start);
1810 start->set_processed();
1811 start = start->next();
1812 }
1813 }
1814 }
1815 return stores;
1816 }
1817 };
1818
1819 static void verify_oop_args(MacroAssembler* masm,
1820 const methodHandle& method,
1821 const BasicType* sig_bt,
1822 const VMRegPair* regs) {
1823 Register temp_reg = rbx; // not part of any compiled calling seq
1824 if (VerifyOops) {
1825 for (int i = 0; i < method->size_of_parameters(); i++) {
1826 if (sig_bt[i] == T_OBJECT ||
1827 sig_bt[i] == T_ARRAY) {
1828 VMReg r = regs[i].first();
1829 assert(r->is_valid(), "bad oop arg");
1830 if (r->is_stack()) {
1831 __ movptr(temp_reg, Address(rsp, r->reg2stack() * VMRegImpl::stack_slot_size + wordSize));
1832 __ verify_oop(temp_reg);
1833 } else {
1834 __ verify_oop(r->as_Register());
1835 }
1836 }
1837 }
1838 }
1839 }
1840
1841 static void gen_special_dispatch(MacroAssembler* masm,
1842 const methodHandle& method,
1843 const BasicType* sig_bt,
1844 const VMRegPair* regs) {
1845 verify_oop_args(masm, method, sig_bt, regs);
1846 vmIntrinsics::ID iid = method->intrinsic_id();
1847
1848 // Now write the args into the outgoing interpreter space
1849 bool has_receiver = false;
1850 Register receiver_reg = noreg;
1851 int member_arg_pos = -1;
1852 Register member_reg = noreg;
1853 int ref_kind = MethodHandles::signature_polymorphic_intrinsic_ref_kind(iid);
1854 if (ref_kind != 0) {
1855 member_arg_pos = method->size_of_parameters() - 1; // trailing MemberName argument
1856 member_reg = rbx; // known to be free at this point
1857 has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind);
1858 } else if (iid == vmIntrinsics::_invokeBasic) {
1859 has_receiver = true;
1860 } else {
1861 fatal("unexpected intrinsic id %d", iid);
1862 }
1863
1864 if (member_reg != noreg) {
1865 // Load the member_arg into register, if necessary.
1866 SharedRuntime::check_member_name_argument_is_last_argument(method, sig_bt, regs);
1867 VMReg r = regs[member_arg_pos].first();
1868 if (r->is_stack()) {
1869 __ movptr(member_reg, Address(rsp, r->reg2stack() * VMRegImpl::stack_slot_size + wordSize));
1870 } else {
1871 // no data motion is needed
1872 member_reg = r->as_Register();
1873 }
1874 }
1875
1876 if (has_receiver) {
1877 // Make sure the receiver is loaded into a register.
1878 assert(method->size_of_parameters() > 0, "oob");
1879 assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object");
1880 VMReg r = regs[0].first();
1881 assert(r->is_valid(), "bad receiver arg");
1882 if (r->is_stack()) {
1883 // Porting note: This assumes that compiled calling conventions always
1884 // pass the receiver oop in a register. If this is not true on some
1885 // platform, pick a temp and load the receiver from stack.
1886 fatal("receiver always in a register");
1887 receiver_reg = j_rarg0; // known to be free at this point
1888 __ movptr(receiver_reg, Address(rsp, r->reg2stack() * VMRegImpl::stack_slot_size + wordSize));
1889 } else {
1890 // no data motion is needed
1891 receiver_reg = r->as_Register();
1892 }
1893 }
1894
1895 // Figure out which address we are really jumping to:
1896 MethodHandles::generate_method_handle_dispatch(masm, iid,
1897 receiver_reg, member_reg, /*for_compiler_entry:*/ true);
1898 }
1899
1900 // ---------------------------------------------------------------------------
1901 // Generate a native wrapper for a given method. The method takes arguments
1902 // in the Java compiled code convention, marshals them to the native
1903 // convention (handlizes oops, etc), transitions to native, makes the call,
1904 // returns to java state (possibly blocking), unhandlizes any result and
1905 // returns.
1906 //
1907 // Critical native functions are a shorthand for the use of
1908 // GetPrimtiveArrayCritical and disallow the use of any other JNI
1909 // functions. The wrapper is expected to unpack the arguments before
1910 // passing them to the callee and perform checks before and after the
1911 // native call to ensure that they GCLocker
1912 // lock_critical/unlock_critical semantics are followed. Some other
1913 // parts of JNI setup are skipped like the tear down of the JNI handle
1914 // block and the check for pending exceptions it's impossible for them
1915 // to be thrown.
1916 //
1917 // They are roughly structured like this:
1918 // if (GCLocker::needs_gc())
1919 // SharedRuntime::block_for_jni_critical();
1920 // tranistion to thread_in_native
1921 // unpack arrray arguments and call native entry point
1922 // check for safepoint in progress
1923 // check if any thread suspend flags are set
1924 // call into JVM and possible unlock the JNI critical
1925 // if a GC was suppressed while in the critical native.
1926 // transition back to thread_in_Java
1927 // return to caller
1928 //
1929 nmethod* SharedRuntime::generate_native_wrapper(MacroAssembler* masm,
1930 const methodHandle& method,
1931 int compile_id,
1932 BasicType* in_sig_bt,
1933 VMRegPair* in_regs,
1934 BasicType ret_type,
1935 address critical_entry) {
1936 if (method->is_method_handle_intrinsic()) {
1937 vmIntrinsics::ID iid = method->intrinsic_id();
1938 intptr_t start = (intptr_t)__ pc();
1939 int vep_offset = ((intptr_t)__ pc()) - start;
1940 gen_special_dispatch(masm,
1941 method,
1942 in_sig_bt,
1943 in_regs);
1944 int frame_complete = ((intptr_t)__ pc()) - start; // not complete, period
1945 __ flush();
1946 int stack_slots = SharedRuntime::out_preserve_stack_slots(); // no out slots at all, actually
1947 return nmethod::new_native_nmethod(method,
1948 compile_id,
1949 masm->code(),
1950 vep_offset,
1951 frame_complete,
1952 stack_slots / VMRegImpl::slots_per_word,
1953 in_ByteSize(-1),
1954 in_ByteSize(-1),
1955 (OopMapSet*)NULL);
1956 }
1957 bool is_critical_native = true;
1958 address native_func = critical_entry;
1959 if (native_func == NULL) {
1960 native_func = method->native_function();
1961 is_critical_native = false;
1962 }
1963 assert(native_func != NULL, "must have function");
1964
1965 // An OopMap for lock (and class if static)
1966 OopMapSet *oop_maps = new OopMapSet();
1967 intptr_t start = (intptr_t)__ pc();
1968
1969 // We have received a description of where all the java arg are located
1970 // on entry to the wrapper. We need to convert these args to where
1971 // the jni function will expect them. To figure out where they go
1972 // we convert the java signature to a C signature by inserting
1973 // the hidden arguments as arg[0] and possibly arg[1] (static method)
1974
1975 const int total_in_args = method->size_of_parameters();
1976 int total_c_args = total_in_args;
1977 if (!is_critical_native) {
1978 total_c_args += 1;
1979 if (method->is_static()) {
1980 total_c_args++;
1981 }
1982 } else {
1983 for (int i = 0; i < total_in_args; i++) {
1984 if (in_sig_bt[i] == T_ARRAY) {
1985 total_c_args++;
1986 }
1987 }
1988 }
1989
1990 BasicType* out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args);
1991 VMRegPair* out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args);
1992 BasicType* in_elem_bt = NULL;
1993
1994 int argc = 0;
1995 if (!is_critical_native) {
1996 out_sig_bt[argc++] = T_ADDRESS;
1997 if (method->is_static()) {
1998 out_sig_bt[argc++] = T_OBJECT;
1999 }
2000
2001 for (int i = 0; i < total_in_args ; i++ ) {
2002 out_sig_bt[argc++] = in_sig_bt[i];
2003 }
2004 } else {
2005 Thread* THREAD = Thread::current();
2006 in_elem_bt = NEW_RESOURCE_ARRAY(BasicType, total_in_args);
2007 SignatureStream ss(method->signature());
2008 for (int i = 0; i < total_in_args ; i++ ) {
2009 if (in_sig_bt[i] == T_ARRAY) {
2010 // Arrays are passed as int, elem* pair
2011 out_sig_bt[argc++] = T_INT;
2012 out_sig_bt[argc++] = T_ADDRESS;
2013 Symbol* atype = ss.as_symbol(CHECK_NULL);
2014 const char* at = atype->as_C_string();
2015 if (strlen(at) == 2) {
2016 assert(at[0] == '[', "must be");
2017 switch (at[1]) {
2018 case 'B': in_elem_bt[i] = T_BYTE; break;
2019 case 'C': in_elem_bt[i] = T_CHAR; break;
2020 case 'D': in_elem_bt[i] = T_DOUBLE; break;
2021 case 'F': in_elem_bt[i] = T_FLOAT; break;
2022 case 'I': in_elem_bt[i] = T_INT; break;
2023 case 'J': in_elem_bt[i] = T_LONG; break;
2024 case 'S': in_elem_bt[i] = T_SHORT; break;
2025 case 'Z': in_elem_bt[i] = T_BOOLEAN; break;
2026 default: ShouldNotReachHere();
2027 }
2028 }
2029 } else {
2030 out_sig_bt[argc++] = in_sig_bt[i];
2031 in_elem_bt[i] = T_VOID;
2032 }
2033 if (in_sig_bt[i] != T_VOID) {
2034 assert(in_sig_bt[i] == ss.type(), "must match");
2035 ss.next();
2036 }
2037 }
2038 }
2039
2040 // Now figure out where the args must be stored and how much stack space
2041 // they require.
2042 int out_arg_slots;
2043 out_arg_slots = c_calling_convention(out_sig_bt, out_regs, NULL, total_c_args);
2044
2045 // Compute framesize for the wrapper. We need to handlize all oops in
2046 // incoming registers
2047
2048 // Calculate the total number of stack slots we will need.
2049
2050 // First count the abi requirement plus all of the outgoing args
2051 int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots;
2052
2053 // Now the space for the inbound oop handle area
2054 int total_save_slots = 6 * VMRegImpl::slots_per_word; // 6 arguments passed in registers
2055 if (is_critical_native) {
2056 // Critical natives may have to call out so they need a save area
2057 // for register arguments.
2058 int double_slots = 0;
2059 int single_slots = 0;
2060 for ( int i = 0; i < total_in_args; i++) {
2061 if (in_regs[i].first()->is_Register()) {
2062 const Register reg = in_regs[i].first()->as_Register();
2063 switch (in_sig_bt[i]) {
2064 case T_BOOLEAN:
2065 case T_BYTE:
2066 case T_SHORT:
2067 case T_CHAR:
2068 case T_INT: single_slots++; break;
2069 case T_ARRAY: // specific to LP64 (7145024)
2070 case T_LONG: double_slots++; break;
2071 default: ShouldNotReachHere();
2072 }
2073 } else if (in_regs[i].first()->is_XMMRegister()) {
2074 switch (in_sig_bt[i]) {
2075 case T_FLOAT: single_slots++; break;
2076 case T_DOUBLE: double_slots++; break;
2077 default: ShouldNotReachHere();
2078 }
2079 } else if (in_regs[i].first()->is_FloatRegister()) {
2080 ShouldNotReachHere();
2081 }
2082 }
2083 total_save_slots = double_slots * 2 + single_slots;
2084 // align the save area
2085 if (double_slots != 0) {
2086 stack_slots = align_up(stack_slots, 2);
2087 }
2088 }
2089
2090 int oop_handle_offset = stack_slots;
2091 stack_slots += total_save_slots;
2092
2093 // Now any space we need for handlizing a klass if static method
2094
2095 int klass_slot_offset = 0;
2096 int klass_offset = -1;
2097 int lock_slot_offset = 0;
2098 bool is_static = false;
2099
2100 if (method->is_static()) {
2101 klass_slot_offset = stack_slots;
2102 stack_slots += VMRegImpl::slots_per_word;
2103 klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size;
2104 is_static = true;
2105 }
2106
2107 // Plus a lock if needed
2108
2109 if (method->is_synchronized()) {
2110 lock_slot_offset = stack_slots;
2111 stack_slots += VMRegImpl::slots_per_word;
2112 }
2113
2114 // Now a place (+2) to save return values or temp during shuffling
2115 // + 4 for return address (which we own) and saved rbp
2116 stack_slots += 6;
2117
2118 // Ok The space we have allocated will look like:
2119 //
2120 //
2121 // FP-> | |
2122 // |---------------------|
2123 // | 2 slots for moves |
2124 // |---------------------|
2125 // | lock box (if sync) |
2126 // |---------------------| <- lock_slot_offset
2127 // | klass (if static) |
2128 // |---------------------| <- klass_slot_offset
2129 // | oopHandle area |
2130 // |---------------------| <- oop_handle_offset (6 java arg registers)
2131 // | outbound memory |
2132 // | based arguments |
2133 // | |
2134 // |---------------------|
2135 // | |
2136 // SP-> | out_preserved_slots |
2137 //
2138 //
2139
2140
2141 // Now compute actual number of stack words we need rounding to make
2142 // stack properly aligned.
2143 stack_slots = align_up(stack_slots, StackAlignmentInSlots);
2144
2145 int stack_size = stack_slots * VMRegImpl::stack_slot_size;
2146
2147 // First thing make an ic check to see if we should even be here
2148
2149 // We are free to use all registers as temps without saving them and
2150 // restoring them except rbp. rbp is the only callee save register
2151 // as far as the interpreter and the compiler(s) are concerned.
2152
2153
2154 const Register ic_reg = rax;
2155 const Register receiver = j_rarg0;
2156
2157 Label hit;
2158 Label exception_pending;
2159
2160 assert_different_registers(ic_reg, receiver, rscratch1);
2161 __ verify_oop(receiver);
2162 __ load_klass(rscratch1, receiver);
2163 __ cmpq(ic_reg, rscratch1);
2164 __ jcc(Assembler::equal, hit);
2165
2166 __ jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
2167
2168 // Verified entry point must be aligned
2169 __ align(8);
2170
2171 __ bind(hit);
2172
2173 int vep_offset = ((intptr_t)__ pc()) - start;
2174
2175 #ifdef COMPILER1
2176 // For Object.hashCode, System.identityHashCode try to pull hashCode from object header if available.
2177 if ((InlineObjectHash && method->intrinsic_id() == vmIntrinsics::_hashCode) || (method->intrinsic_id() == vmIntrinsics::_identityHashCode)) {
2178 inline_check_hashcode_from_object_header(masm, method, j_rarg0 /*obj_reg*/, rax /*result*/);
2179 }
2180 #endif // COMPILER1
2181
2182 // The instruction at the verified entry point must be 5 bytes or longer
2183 // because it can be patched on the fly by make_non_entrant. The stack bang
2184 // instruction fits that requirement.
2185
2186 // Generate stack overflow check
2187
2188 if (UseStackBanging) {
2189 __ bang_stack_with_offset((int)JavaThread::stack_shadow_zone_size());
2190 } else {
2191 // need a 5 byte instruction to allow MT safe patching to non-entrant
2192 __ fat_nop();
2193 }
2194
2195 // Generate a new frame for the wrapper.
2196 __ enter();
2197 // -2 because return address is already present and so is saved rbp
2198 __ subptr(rsp, stack_size - 2*wordSize);
2199
2200 // Frame is now completed as far as size and linkage.
2201 int frame_complete = ((intptr_t)__ pc()) - start;
2202
2203 if (UseRTMLocking) {
2204 // Abort RTM transaction before calling JNI
2205 // because critical section will be large and will be
2206 // aborted anyway. Also nmethod could be deoptimized.
2207 __ xabort(0);
2208 }
2209
2210 #ifdef ASSERT
2211 {
2212 Label L;
2213 __ mov(rax, rsp);
2214 __ andptr(rax, -16); // must be 16 byte boundary (see amd64 ABI)
2215 __ cmpptr(rax, rsp);
2216 __ jcc(Assembler::equal, L);
2217 __ stop("improperly aligned stack");
2218 __ bind(L);
2219 }
2220 #endif /* ASSERT */
2221
2222
2223 // We use r14 as the oop handle for the receiver/klass
2224 // It is callee save so it survives the call to native
2225
2226 const Register oop_handle_reg = r14;
2227
2228 if (is_critical_native && !Universe::heap()->supports_object_pinning()) {
2229 check_needs_gc_for_critical_native(masm, stack_slots, total_c_args, total_in_args,
2230 oop_handle_offset, oop_maps, in_regs, in_sig_bt);
2231 }
2232
2233 //
2234 // We immediately shuffle the arguments so that any vm call we have to
2235 // make from here on out (sync slow path, jvmti, etc.) we will have
2236 // captured the oops from our caller and have a valid oopMap for
2237 // them.
2238
2239 // -----------------
2240 // The Grand Shuffle
2241
2242 // The Java calling convention is either equal (linux) or denser (win64) than the
2243 // c calling convention. However the because of the jni_env argument the c calling
2244 // convention always has at least one more (and two for static) arguments than Java.
2245 // Therefore if we move the args from java -> c backwards then we will never have
2246 // a register->register conflict and we don't have to build a dependency graph
2247 // and figure out how to break any cycles.
2248 //
2249
2250 // Record esp-based slot for receiver on stack for non-static methods
2251 int receiver_offset = -1;
2252
2253 // This is a trick. We double the stack slots so we can claim
2254 // the oops in the caller's frame. Since we are sure to have
2255 // more args than the caller doubling is enough to make
2256 // sure we can capture all the incoming oop args from the
2257 // caller.
2258 //
2259 OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/);
2260
2261 // Mark location of rbp (someday)
2262 // map->set_callee_saved(VMRegImpl::stack2reg( stack_slots - 2), stack_slots * 2, 0, vmreg(rbp));
2263
2264 // Use eax, ebx as temporaries during any memory-memory moves we have to do
2265 // All inbound args are referenced based on rbp and all outbound args via rsp.
2266
2267
2268 #ifdef ASSERT
2269 bool reg_destroyed[RegisterImpl::number_of_registers];
2270 bool freg_destroyed[XMMRegisterImpl::number_of_registers];
2271 for ( int r = 0 ; r < RegisterImpl::number_of_registers ; r++ ) {
2272 reg_destroyed[r] = false;
2273 }
2274 for ( int f = 0 ; f < XMMRegisterImpl::number_of_registers ; f++ ) {
2275 freg_destroyed[f] = false;
2276 }
2277
2278 #endif /* ASSERT */
2279
2280 // This may iterate in two different directions depending on the
2281 // kind of native it is. The reason is that for regular JNI natives
2282 // the incoming and outgoing registers are offset upwards and for
2283 // critical natives they are offset down.
2284 GrowableArray<int> arg_order(2 * total_in_args);
2285 // Inbound arguments that need to be pinned for critical natives
2286 GrowableArray<int> pinned_args(total_in_args);
2287 // Current stack slot for storing register based array argument
2288 int pinned_slot = oop_handle_offset;
2289
2290 VMRegPair tmp_vmreg;
2291 tmp_vmreg.set2(rbx->as_VMReg());
2292
2293 if (!is_critical_native) {
2294 for (int i = total_in_args - 1, c_arg = total_c_args - 1; i >= 0; i--, c_arg--) {
2295 arg_order.push(i);
2296 arg_order.push(c_arg);
2297 }
2298 } else {
2299 // Compute a valid move order, using tmp_vmreg to break any cycles
2300 ComputeMoveOrder cmo(total_in_args, in_regs, total_c_args, out_regs, in_sig_bt, arg_order, tmp_vmreg);
2301 }
2302
2303 int temploc = -1;
2304 for (int ai = 0; ai < arg_order.length(); ai += 2) {
2305 int i = arg_order.at(ai);
2306 int c_arg = arg_order.at(ai + 1);
2307 __ block_comment(err_msg("move %d -> %d", i, c_arg));
2308 if (c_arg == -1) {
2309 assert(is_critical_native, "should only be required for critical natives");
2310 // This arg needs to be moved to a temporary
2311 __ mov(tmp_vmreg.first()->as_Register(), in_regs[i].first()->as_Register());
2312 in_regs[i] = tmp_vmreg;
2313 temploc = i;
2314 continue;
2315 } else if (i == -1) {
2316 assert(is_critical_native, "should only be required for critical natives");
2317 // Read from the temporary location
2318 assert(temploc != -1, "must be valid");
2319 i = temploc;
2320 temploc = -1;
2321 }
2322 #ifdef ASSERT
2323 if (in_regs[i].first()->is_Register()) {
2324 assert(!reg_destroyed[in_regs[i].first()->as_Register()->encoding()], "destroyed reg!");
2325 } else if (in_regs[i].first()->is_XMMRegister()) {
2326 assert(!freg_destroyed[in_regs[i].first()->as_XMMRegister()->encoding()], "destroyed reg!");
2327 }
2328 if (out_regs[c_arg].first()->is_Register()) {
2329 reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true;
2330 } else if (out_regs[c_arg].first()->is_XMMRegister()) {
2331 freg_destroyed[out_regs[c_arg].first()->as_XMMRegister()->encoding()] = true;
2332 }
2333 #endif /* ASSERT */
2334 switch (in_sig_bt[i]) {
2335 case T_ARRAY:
2336 if (is_critical_native) {
2337 // pin before unpack
2338 if (Universe::heap()->supports_object_pinning()) {
2339 assert(pinned_slot <= stack_slots, "overflow");
2340 pin_critical_native_array(masm, in_regs[i], pinned_slot);
2341 pinned_args.append(i);
2342 }
2343 unpack_array_argument(masm, in_regs[i], in_elem_bt[i], out_regs[c_arg + 1], out_regs[c_arg]);
2344 c_arg++;
2345 #ifdef ASSERT
2346 if (out_regs[c_arg].first()->is_Register()) {
2347 reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true;
2348 } else if (out_regs[c_arg].first()->is_XMMRegister()) {
2349 freg_destroyed[out_regs[c_arg].first()->as_XMMRegister()->encoding()] = true;
2350 }
2351 #endif
2352 break;
2353 }
2354 case T_OBJECT:
2355 assert(!is_critical_native, "no oop arguments");
2356 object_move(masm, map, oop_handle_offset, stack_slots, in_regs[i], out_regs[c_arg],
2357 ((i == 0) && (!is_static)),
2358 &receiver_offset);
2359 break;
2360 case T_VOID:
2361 break;
2362
2363 case T_FLOAT:
2364 float_move(masm, in_regs[i], out_regs[c_arg]);
2365 break;
2366
2367 case T_DOUBLE:
2368 assert( i + 1 < total_in_args &&
2369 in_sig_bt[i + 1] == T_VOID &&
2370 out_sig_bt[c_arg+1] == T_VOID, "bad arg list");
2371 double_move(masm, in_regs[i], out_regs[c_arg]);
2372 break;
2373
2374 case T_LONG :
2375 long_move(masm, in_regs[i], out_regs[c_arg]);
2376 break;
2377
2378 case T_ADDRESS: assert(false, "found T_ADDRESS in java args");
2379
2380 default:
2381 move32_64(masm, in_regs[i], out_regs[c_arg]);
2382 }
2383 }
2384
2385 int c_arg;
2386
2387 // Pre-load a static method's oop into r14. Used both by locking code and
2388 // the normal JNI call code.
2389 if (!is_critical_native) {
2390 // point c_arg at the first arg that is already loaded in case we
2391 // need to spill before we call out
2392 c_arg = total_c_args - total_in_args;
2393
2394 if (method->is_static()) {
2395
2396 // load oop into a register
2397 __ movoop(oop_handle_reg, JNIHandles::make_local(method->method_holder()->java_mirror()));
2398
2399 // Now handlize the static class mirror it's known not-null.
2400 __ movptr(Address(rsp, klass_offset), oop_handle_reg);
2401 map->set_oop(VMRegImpl::stack2reg(klass_slot_offset));
2402
2403 // Now get the handle
2404 __ lea(oop_handle_reg, Address(rsp, klass_offset));
2405 // store the klass handle as second argument
2406 __ movptr(c_rarg1, oop_handle_reg);
2407 // and protect the arg if we must spill
2408 c_arg--;
2409 }
2410 } else {
2411 // For JNI critical methods we need to save all registers in save_args.
2412 c_arg = 0;
2413 }
2414
2415 // Change state to native (we save the return address in the thread, since it might not
2416 // be pushed on the stack when we do a a stack traversal). It is enough that the pc()
2417 // points into the right code segment. It does not have to be the correct return pc.
2418 // We use the same pc/oopMap repeatedly when we call out
2419
2420 intptr_t the_pc = (intptr_t) __ pc();
2421 oop_maps->add_gc_map(the_pc - start, map);
2422
2423 __ set_last_Java_frame(rsp, noreg, (address)the_pc);
2424
2425
2426 // We have all of the arguments setup at this point. We must not touch any register
2427 // argument registers at this point (what if we save/restore them there are no oop?
2428
2429 {
2430 SkipIfEqual skip(masm, &DTraceMethodProbes, false);
2431 // protect the args we've loaded
2432 save_args(masm, total_c_args, c_arg, out_regs);
2433 __ mov_metadata(c_rarg1, method());
2434 __ call_VM_leaf(
2435 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry),
2436 r15_thread, c_rarg1);
2437 restore_args(masm, total_c_args, c_arg, out_regs);
2438 }
2439
2440 // RedefineClasses() tracing support for obsolete method entry
2441 if (log_is_enabled(Trace, redefine, class, obsolete)) {
2442 // protect the args we've loaded
2443 save_args(masm, total_c_args, c_arg, out_regs);
2444 __ mov_metadata(c_rarg1, method());
2445 __ call_VM_leaf(
2446 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry),
2447 r15_thread, c_rarg1);
2448 restore_args(masm, total_c_args, c_arg, out_regs);
2449 }
2450
2451 // Lock a synchronized method
2452
2453 // Register definitions used by locking and unlocking
2454
2455 const Register swap_reg = rax; // Must use rax for cmpxchg instruction
2456 const Register obj_reg = rbx; // Will contain the oop
2457 const Register lock_reg = r13; // Address of compiler lock object (BasicLock)
2458 const Register old_hdr = r13; // value of old header at unlock time
2459
2460 Label slow_path_lock;
2461 Label lock_done;
2462
2463 if (method->is_synchronized()) {
2464 assert(!is_critical_native, "unhandled");
2465
2466
2467 const int mark_word_offset = BasicLock::displaced_header_offset_in_bytes();
2468
2469 // Get the handle (the 2nd argument)
2470 __ mov(oop_handle_reg, c_rarg1);
2471
2472 // Get address of the box
2473
2474 __ lea(lock_reg, Address(rsp, lock_slot_offset * VMRegImpl::stack_slot_size));
2475
2476 // Load the oop from the handle
2477 __ movptr(obj_reg, Address(oop_handle_reg, 0));
2478
2479 if (UseBiasedLocking) {
2480 __ biased_locking_enter(lock_reg, obj_reg, swap_reg, rscratch1, false, lock_done, &slow_path_lock);
2481 }
2482
2483 // Load immediate 1 into swap_reg %rax
2484 __ movl(swap_reg, 1);
2485
2486 // Load (object->mark() | 1) into swap_reg %rax
2487 __ orptr(swap_reg, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
2488
2489 // Save (object->mark() | 1) into BasicLock's displaced header
2490 __ movptr(Address(lock_reg, mark_word_offset), swap_reg);
2491
2492 if (os::is_MP()) {
2493 __ lock();
2494 }
2495
2496 // src -> dest iff dest == rax else rax <- dest
2497 __ cmpxchgptr(lock_reg, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
2498 __ jcc(Assembler::equal, lock_done);
2499
2500 // Hmm should this move to the slow path code area???
2501
2502 // Test if the oopMark is an obvious stack pointer, i.e.,
2503 // 1) (mark & 3) == 0, and
2504 // 2) rsp <= mark < mark + os::pagesize()
2505 // These 3 tests can be done by evaluating the following
2506 // expression: ((mark - rsp) & (3 - os::vm_page_size())),
2507 // assuming both stack pointer and pagesize have their
2508 // least significant 2 bits clear.
2509 // NOTE: the oopMark is in swap_reg %rax as the result of cmpxchg
2510
2511 __ subptr(swap_reg, rsp);
2512 __ andptr(swap_reg, 3 - os::vm_page_size());
2513
2514 // Save the test result, for recursive case, the result is zero
2515 __ movptr(Address(lock_reg, mark_word_offset), swap_reg);
2516 __ jcc(Assembler::notEqual, slow_path_lock);
2517
2518 // Slow path will re-enter here
2519
2520 __ bind(lock_done);
2521 }
2522
2523
2524 // Finally just about ready to make the JNI call
2525
2526
2527 // get JNIEnv* which is first argument to native
2528 if (!is_critical_native) {
2529 __ lea(c_rarg0, Address(r15_thread, in_bytes(JavaThread::jni_environment_offset())));
2530 }
2531
2532 // Now set thread in native
2533 __ movl(Address(r15_thread, JavaThread::thread_state_offset()), _thread_in_native);
2534
2535 __ call(RuntimeAddress(native_func));
2536
2537 // Verify or restore cpu control state after JNI call
2538 __ restore_cpu_control_state_after_jni();
2539
2540 // Unpack native results.
2541 switch (ret_type) {
2542 case T_BOOLEAN: __ c2bool(rax); break;
2543 case T_CHAR : __ movzwl(rax, rax); break;
2544 case T_BYTE : __ sign_extend_byte (rax); break;
2545 case T_SHORT : __ sign_extend_short(rax); break;
2546 case T_INT : /* nothing to do */ break;
2547 case T_DOUBLE :
2548 case T_FLOAT :
2549 // Result is in xmm0 we'll save as needed
2550 break;
2551 case T_ARRAY: // Really a handle
2552 case T_OBJECT: // Really a handle
2553 break; // can't de-handlize until after safepoint check
2554 case T_VOID: break;
2555 case T_LONG: break;
2556 default : ShouldNotReachHere();
2557 }
2558
2559 // unpin pinned arguments
2560 pinned_slot = oop_handle_offset;
2561 if (pinned_args.length() > 0) {
2562 // save return value that may be overwritten otherwise.
2563 save_native_result(masm, ret_type, stack_slots);
2564 for (int index = 0; index < pinned_args.length(); index ++) {
2565 int i = pinned_args.at(index);
2566 assert(pinned_slot <= stack_slots, "overflow");
2567 unpin_critical_native_array(masm, in_regs[i], pinned_slot);
2568 }
2569 restore_native_result(masm, ret_type, stack_slots);
2570 }
2571
2572 // Switch thread to "native transition" state before reading the synchronization state.
2573 // This additional state is necessary because reading and testing the synchronization
2574 // state is not atomic w.r.t. GC, as this scenario demonstrates:
2575 // Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted.
2576 // VM thread changes sync state to synchronizing and suspends threads for GC.
2577 // Thread A is resumed to finish this native method, but doesn't block here since it
2578 // didn't see any synchronization is progress, and escapes.
2579 __ movl(Address(r15_thread, JavaThread::thread_state_offset()), _thread_in_native_trans);
2580
2581 if(os::is_MP()) {
2582 if (UseMembar) {
2583 // Force this write out before the read below
2584 __ membar(Assembler::Membar_mask_bits(
2585 Assembler::LoadLoad | Assembler::LoadStore |
2586 Assembler::StoreLoad | Assembler::StoreStore));
2587 } else {
2588 // Write serialization page so VM thread can do a pseudo remote membar.
2589 // We use the current thread pointer to calculate a thread specific
2590 // offset to write to within the page. This minimizes bus traffic
2591 // due to cache line collision.
2592 __ serialize_memory(r15_thread, rcx);
2593 }
2594 }
2595
2596 Label after_transition;
2597
2598 // check for safepoint operation in progress and/or pending suspend requests
2599 {
2600 Label Continue;
2601 Label slow_path;
2602
2603 __ safepoint_poll(slow_path, r15_thread, rscratch1);
2604
2605 __ cmpl(Address(r15_thread, JavaThread::suspend_flags_offset()), 0);
2606 __ jcc(Assembler::equal, Continue);
2607 __ bind(slow_path);
2608
2609 // Don't use call_VM as it will see a possible pending exception and forward it
2610 // and never return here preventing us from clearing _last_native_pc down below.
2611 // Also can't use call_VM_leaf either as it will check to see if rsi & rdi are
2612 // preserved and correspond to the bcp/locals pointers. So we do a runtime call
2613 // by hand.
2614 //
2615 __ vzeroupper();
2616 save_native_result(masm, ret_type, stack_slots);
2617 __ mov(c_rarg0, r15_thread);
2618 __ mov(r12, rsp); // remember sp
2619 __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows
2620 __ andptr(rsp, -16); // align stack as required by ABI
2621 if (!is_critical_native) {
2622 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans)));
2623 } else {
2624 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans_and_transition)));
2625 }
2626 __ mov(rsp, r12); // restore sp
2627 __ reinit_heapbase();
2628 // Restore any method result value
2629 restore_native_result(masm, ret_type, stack_slots);
2630
2631 if (is_critical_native) {
2632 // The call above performed the transition to thread_in_Java so
2633 // skip the transition logic below.
2634 __ jmpb(after_transition);
2635 }
2636
2637 __ bind(Continue);
2638 }
2639
2640 // change thread state
2641 __ movl(Address(r15_thread, JavaThread::thread_state_offset()), _thread_in_Java);
2642 __ bind(after_transition);
2643
2644 Label reguard;
2645 Label reguard_done;
2646 __ cmpl(Address(r15_thread, JavaThread::stack_guard_state_offset()), JavaThread::stack_guard_yellow_reserved_disabled);
2647 __ jcc(Assembler::equal, reguard);
2648 __ bind(reguard_done);
2649
2650 // native result if any is live
2651
2652 // Unlock
2653 Label unlock_done;
2654 Label slow_path_unlock;
2655 if (method->is_synchronized()) {
2656
2657 // Get locked oop from the handle we passed to jni
2658 __ movptr(obj_reg, Address(oop_handle_reg, 0));
2659
2660 Label done;
2661
2662 if (UseBiasedLocking) {
2663 __ biased_locking_exit(obj_reg, old_hdr, done);
2664 }
2665
2666 // Simple recursive lock?
2667
2668 __ cmpptr(Address(rsp, lock_slot_offset * VMRegImpl::stack_slot_size), (int32_t)NULL_WORD);
2669 __ jcc(Assembler::equal, done);
2670
2671 // Must save rax if if it is live now because cmpxchg must use it
2672 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) {
2673 save_native_result(masm, ret_type, stack_slots);
2674 }
2675
2676
2677 // get address of the stack lock
2678 __ lea(rax, Address(rsp, lock_slot_offset * VMRegImpl::stack_slot_size));
2679 // get old displaced header
2680 __ movptr(old_hdr, Address(rax, 0));
2681
2682 // Atomic swap old header if oop still contains the stack lock
2683 if (os::is_MP()) {
2684 __ lock();
2685 }
2686 __ cmpxchgptr(old_hdr, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
2687 __ jcc(Assembler::notEqual, slow_path_unlock);
2688
2689 // slow path re-enters here
2690 __ bind(unlock_done);
2691 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) {
2692 restore_native_result(masm, ret_type, stack_slots);
2693 }
2694
2695 __ bind(done);
2696
2697 }
2698 {
2699 SkipIfEqual skip(masm, &DTraceMethodProbes, false);
2700 save_native_result(masm, ret_type, stack_slots);
2701 __ mov_metadata(c_rarg1, method());
2702 __ call_VM_leaf(
2703 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),
2704 r15_thread, c_rarg1);
2705 restore_native_result(masm, ret_type, stack_slots);
2706 }
2707
2708 __ reset_last_Java_frame(false);
2709
2710 // Unbox oop result, e.g. JNIHandles::resolve value.
2711 if (ret_type == T_OBJECT || ret_type == T_ARRAY) {
2712 __ resolve_jobject(rax /* value */,
2713 r15_thread /* thread */,
2714 rcx /* tmp */);
2715 }
2716
2717 if (CheckJNICalls) {
2718 // clear_pending_jni_exception_check
2719 __ movptr(Address(r15_thread, JavaThread::pending_jni_exception_check_fn_offset()), NULL_WORD);
2720 }
2721
2722 if (!is_critical_native) {
2723 // reset handle block
2724 __ movptr(rcx, Address(r15_thread, JavaThread::active_handles_offset()));
2725 __ movl(Address(rcx, JNIHandleBlock::top_offset_in_bytes()), (int32_t)NULL_WORD);
2726 }
2727
2728 // pop our frame
2729
2730 __ leave();
2731
2732 if (!is_critical_native) {
2733 // Any exception pending?
2734 __ cmpptr(Address(r15_thread, in_bytes(Thread::pending_exception_offset())), (int32_t)NULL_WORD);
2735 __ jcc(Assembler::notEqual, exception_pending);
2736 }
2737
2738 // Return
2739
2740 __ ret(0);
2741
2742 // Unexpected paths are out of line and go here
2743
2744 if (!is_critical_native) {
2745 // forward the exception
2746 __ bind(exception_pending);
2747
2748 // and forward the exception
2749 __ jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2750 }
2751
2752 // Slow path locking & unlocking
2753 if (method->is_synchronized()) {
2754
2755 // BEGIN Slow path lock
2756 __ bind(slow_path_lock);
2757
2758 // has last_Java_frame setup. No exceptions so do vanilla call not call_VM
2759 // args are (oop obj, BasicLock* lock, JavaThread* thread)
2760
2761 // protect the args we've loaded
2762 save_args(masm, total_c_args, c_arg, out_regs);
2763
2764 __ mov(c_rarg0, obj_reg);
2765 __ mov(c_rarg1, lock_reg);
2766 __ mov(c_rarg2, r15_thread);
2767
2768 // Not a leaf but we have last_Java_frame setup as we want
2769 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C), 3);
2770 restore_args(masm, total_c_args, c_arg, out_regs);
2771
2772 #ifdef ASSERT
2773 { Label L;
2774 __ cmpptr(Address(r15_thread, in_bytes(Thread::pending_exception_offset())), (int32_t)NULL_WORD);
2775 __ jcc(Assembler::equal, L);
2776 __ stop("no pending exception allowed on exit from monitorenter");
2777 __ bind(L);
2778 }
2779 #endif
2780 __ jmp(lock_done);
2781
2782 // END Slow path lock
2783
2784 // BEGIN Slow path unlock
2785 __ bind(slow_path_unlock);
2786
2787 // If we haven't already saved the native result we must save it now as xmm registers
2788 // are still exposed.
2789 __ vzeroupper();
2790 if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) {
2791 save_native_result(masm, ret_type, stack_slots);
2792 }
2793
2794 __ lea(c_rarg1, Address(rsp, lock_slot_offset * VMRegImpl::stack_slot_size));
2795
2796 __ mov(c_rarg0, obj_reg);
2797 __ mov(c_rarg2, r15_thread);
2798 __ mov(r12, rsp); // remember sp
2799 __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows
2800 __ andptr(rsp, -16); // align stack as required by ABI
2801
2802 // Save pending exception around call to VM (which contains an EXCEPTION_MARK)
2803 // NOTE that obj_reg == rbx currently
2804 __ movptr(rbx, Address(r15_thread, in_bytes(Thread::pending_exception_offset())));
2805 __ movptr(Address(r15_thread, in_bytes(Thread::pending_exception_offset())), (int32_t)NULL_WORD);
2806
2807 // args are (oop obj, BasicLock* lock, JavaThread* thread)
2808 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C)));
2809 __ mov(rsp, r12); // restore sp
2810 __ reinit_heapbase();
2811 #ifdef ASSERT
2812 {
2813 Label L;
2814 __ cmpptr(Address(r15_thread, in_bytes(Thread::pending_exception_offset())), (int)NULL_WORD);
2815 __ jcc(Assembler::equal, L);
2816 __ stop("no pending exception allowed on exit complete_monitor_unlocking_C");
2817 __ bind(L);
2818 }
2819 #endif /* ASSERT */
2820
2821 __ movptr(Address(r15_thread, in_bytes(Thread::pending_exception_offset())), rbx);
2822
2823 if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) {
2824 restore_native_result(masm, ret_type, stack_slots);
2825 }
2826 __ jmp(unlock_done);
2827
2828 // END Slow path unlock
2829
2830 } // synchronized
2831
2832 // SLOW PATH Reguard the stack if needed
2833
2834 __ bind(reguard);
2835 __ vzeroupper();
2836 save_native_result(masm, ret_type, stack_slots);
2837 __ mov(r12, rsp); // remember sp
2838 __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows
2839 __ andptr(rsp, -16); // align stack as required by ABI
2840 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages)));
2841 __ mov(rsp, r12); // restore sp
2842 __ reinit_heapbase();
2843 restore_native_result(masm, ret_type, stack_slots);
2844 // and continue
2845 __ jmp(reguard_done);
2846
2847
2848
2849 __ flush();
2850
2851 nmethod *nm = nmethod::new_native_nmethod(method,
2852 compile_id,
2853 masm->code(),
2854 vep_offset,
2855 frame_complete,
2856 stack_slots / VMRegImpl::slots_per_word,
2857 (is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)),
2858 in_ByteSize(lock_slot_offset*VMRegImpl::stack_slot_size),
2859 oop_maps);
2860
2861 if (is_critical_native) {
2862 nm->set_lazy_critical_native(true);
2863 }
2864
2865 return nm;
2866
2867 }
2868
2869 // this function returns the adjust size (in number of words) to a c2i adapter
2870 // activation for use during deoptimization
2871 int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals ) {
2872 return (callee_locals - callee_parameters) * Interpreter::stackElementWords;
2873 }
2874
2875
2876 uint SharedRuntime::out_preserve_stack_slots() {
2877 return 0;
2878 }
2879
2880 //------------------------------generate_deopt_blob----------------------------
2881 void SharedRuntime::generate_deopt_blob() {
2882 // Allocate space for the code
2883 ResourceMark rm;
2884 // Setup code generation tools
2885 int pad = 0;
2886 #if INCLUDE_JVMCI
2887 if (EnableJVMCI || UseAOT) {
2888 pad += 512; // Increase the buffer size when compiling for JVMCI
2889 }
2890 #endif
2891 CodeBuffer buffer("deopt_blob", 2048+pad, 1024);
2892 MacroAssembler* masm = new MacroAssembler(&buffer);
2893 int frame_size_in_words;
2894 OopMap* map = NULL;
2895 OopMapSet *oop_maps = new OopMapSet();
2896
2897 // -------------
2898 // This code enters when returning to a de-optimized nmethod. A return
2899 // address has been pushed on the the stack, and return values are in
2900 // registers.
2901 // If we are doing a normal deopt then we were called from the patched
2902 // nmethod from the point we returned to the nmethod. So the return
2903 // address on the stack is wrong by NativeCall::instruction_size
2904 // We will adjust the value so it looks like we have the original return
2905 // address on the stack (like when we eagerly deoptimized).
2906 // In the case of an exception pending when deoptimizing, we enter
2907 // with a return address on the stack that points after the call we patched
2908 // into the exception handler. We have the following register state from,
2909 // e.g., the forward exception stub (see stubGenerator_x86_64.cpp).
2910 // rax: exception oop
2911 // rbx: exception handler
2912 // rdx: throwing pc
2913 // So in this case we simply jam rdx into the useless return address and
2914 // the stack looks just like we want.
2915 //
2916 // At this point we need to de-opt. We save the argument return
2917 // registers. We call the first C routine, fetch_unroll_info(). This
2918 // routine captures the return values and returns a structure which
2919 // describes the current frame size and the sizes of all replacement frames.
2920 // The current frame is compiled code and may contain many inlined
2921 // functions, each with their own JVM state. We pop the current frame, then
2922 // push all the new frames. Then we call the C routine unpack_frames() to
2923 // populate these frames. Finally unpack_frames() returns us the new target
2924 // address. Notice that callee-save registers are BLOWN here; they have
2925 // already been captured in the vframeArray at the time the return PC was
2926 // patched.
2927 address start = __ pc();
2928 Label cont;
2929
2930 // Prolog for non exception case!
2931
2932 // Save everything in sight.
2933 map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words);
2934
2935 // Normal deoptimization. Save exec mode for unpack_frames.
2936 __ movl(r14, Deoptimization::Unpack_deopt); // callee-saved
2937 __ jmp(cont);
2938
2939 int reexecute_offset = __ pc() - start;
2940 #if INCLUDE_JVMCI && !defined(COMPILER1)
2941 if (EnableJVMCI && UseJVMCICompiler) {
2942 // JVMCI does not use this kind of deoptimization
2943 __ should_not_reach_here();
2944 }
2945 #endif
2946
2947 // Reexecute case
2948 // return address is the pc describes what bci to do re-execute at
2949
2950 // No need to update map as each call to save_live_registers will produce identical oopmap
2951 (void) RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words);
2952
2953 __ movl(r14, Deoptimization::Unpack_reexecute); // callee-saved
2954 __ jmp(cont);
2955
2956 #if INCLUDE_JVMCI
2957 Label after_fetch_unroll_info_call;
2958 int implicit_exception_uncommon_trap_offset = 0;
2959 int uncommon_trap_offset = 0;
2960
2961 if (EnableJVMCI || UseAOT) {
2962 implicit_exception_uncommon_trap_offset = __ pc() - start;
2963
2964 __ pushptr(Address(r15_thread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset())));
2965 __ movptr(Address(r15_thread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset())), (int32_t)NULL_WORD);
2966
2967 uncommon_trap_offset = __ pc() - start;
2968
2969 // Save everything in sight.
2970 RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words);
2971 // fetch_unroll_info needs to call last_java_frame()
2972 __ set_last_Java_frame(noreg, noreg, NULL);
2973
2974 __ movl(c_rarg1, Address(r15_thread, in_bytes(JavaThread::pending_deoptimization_offset())));
2975 __ movl(Address(r15_thread, in_bytes(JavaThread::pending_deoptimization_offset())), -1);
2976
2977 __ movl(r14, (int32_t)Deoptimization::Unpack_reexecute);
2978 __ mov(c_rarg0, r15_thread);
2979 __ movl(c_rarg2, r14); // exec mode
2980 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::uncommon_trap)));
2981 oop_maps->add_gc_map( __ pc()-start, map->deep_copy());
2982
2983 __ reset_last_Java_frame(false);
2984
2985 __ jmp(after_fetch_unroll_info_call);
2986 } // EnableJVMCI
2987 #endif // INCLUDE_JVMCI
2988
2989 int exception_offset = __ pc() - start;
2990
2991 // Prolog for exception case
2992
2993 // all registers are dead at this entry point, except for rax, and
2994 // rdx which contain the exception oop and exception pc
2995 // respectively. Set them in TLS and fall thru to the
2996 // unpack_with_exception_in_tls entry point.
2997
2998 __ movptr(Address(r15_thread, JavaThread::exception_pc_offset()), rdx);
2999 __ movptr(Address(r15_thread, JavaThread::exception_oop_offset()), rax);
3000
3001 int exception_in_tls_offset = __ pc() - start;
3002
3003 // new implementation because exception oop is now passed in JavaThread
3004
3005 // Prolog for exception case
3006 // All registers must be preserved because they might be used by LinearScan
3007 // Exceptiop oop and throwing PC are passed in JavaThread
3008 // tos: stack at point of call to method that threw the exception (i.e. only
3009 // args are on the stack, no return address)
3010
3011 // make room on stack for the return address
3012 // It will be patched later with the throwing pc. The correct value is not
3013 // available now because loading it from memory would destroy registers.
3014 __ push(0);
3015
3016 // Save everything in sight.
3017 map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words);
3018
3019 // Now it is safe to overwrite any register
3020
3021 // Deopt during an exception. Save exec mode for unpack_frames.
3022 __ movl(r14, Deoptimization::Unpack_exception); // callee-saved
3023
3024 // load throwing pc from JavaThread and patch it as the return address
3025 // of the current frame. Then clear the field in JavaThread
3026
3027 __ movptr(rdx, Address(r15_thread, JavaThread::exception_pc_offset()));
3028 __ movptr(Address(rbp, wordSize), rdx);
3029 __ movptr(Address(r15_thread, JavaThread::exception_pc_offset()), (int32_t)NULL_WORD);
3030
3031 #ifdef ASSERT
3032 // verify that there is really an exception oop in JavaThread
3033 __ movptr(rax, Address(r15_thread, JavaThread::exception_oop_offset()));
3034 __ verify_oop(rax);
3035
3036 // verify that there is no pending exception
3037 Label no_pending_exception;
3038 __ movptr(rax, Address(r15_thread, Thread::pending_exception_offset()));
3039 __ testptr(rax, rax);
3040 __ jcc(Assembler::zero, no_pending_exception);
3041 __ stop("must not have pending exception here");
3042 __ bind(no_pending_exception);
3043 #endif
3044
3045 __ bind(cont);
3046
3047 // Call C code. Need thread and this frame, but NOT official VM entry
3048 // crud. We cannot block on this call, no GC can happen.
3049 //
3050 // UnrollBlock* fetch_unroll_info(JavaThread* thread)
3051
3052 // fetch_unroll_info needs to call last_java_frame().
3053
3054 __ set_last_Java_frame(noreg, noreg, NULL);
3055 #ifdef ASSERT
3056 { Label L;
3057 __ cmpptr(Address(r15_thread,
3058 JavaThread::last_Java_fp_offset()),
3059 (int32_t)0);
3060 __ jcc(Assembler::equal, L);
3061 __ stop("SharedRuntime::generate_deopt_blob: last_Java_fp not cleared");
3062 __ bind(L);
3063 }
3064 #endif // ASSERT
3065 __ mov(c_rarg0, r15_thread);
3066 __ movl(c_rarg1, r14); // exec_mode
3067 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info)));
3068
3069 // Need to have an oopmap that tells fetch_unroll_info where to
3070 // find any register it might need.
3071 oop_maps->add_gc_map(__ pc() - start, map);
3072
3073 __ reset_last_Java_frame(false);
3074
3075 #if INCLUDE_JVMCI
3076 if (EnableJVMCI || UseAOT) {
3077 __ bind(after_fetch_unroll_info_call);
3078 }
3079 #endif
3080
3081 // Load UnrollBlock* into rdi
3082 __ mov(rdi, rax);
3083
3084 __ movl(r14, Address(rdi, Deoptimization::UnrollBlock::unpack_kind_offset_in_bytes()));
3085 Label noException;
3086 __ cmpl(r14, Deoptimization::Unpack_exception); // Was exception pending?
3087 __ jcc(Assembler::notEqual, noException);
3088 __ movptr(rax, Address(r15_thread, JavaThread::exception_oop_offset()));
3089 // QQQ this is useless it was NULL above
3090 __ movptr(rdx, Address(r15_thread, JavaThread::exception_pc_offset()));
3091 __ movptr(Address(r15_thread, JavaThread::exception_oop_offset()), (int32_t)NULL_WORD);
3092 __ movptr(Address(r15_thread, JavaThread::exception_pc_offset()), (int32_t)NULL_WORD);
3093
3094 __ verify_oop(rax);
3095
3096 // Overwrite the result registers with the exception results.
3097 __ movptr(Address(rsp, RegisterSaver::rax_offset_in_bytes()), rax);
3098 // I think this is useless
3099 __ movptr(Address(rsp, RegisterSaver::rdx_offset_in_bytes()), rdx);
3100
3101 __ bind(noException);
3102
3103 // Only register save data is on the stack.
3104 // Now restore the result registers. Everything else is either dead
3105 // or captured in the vframeArray.
3106 RegisterSaver::restore_result_registers(masm);
3107
3108 // All of the register save area has been popped of the stack. Only the
3109 // return address remains.
3110
3111 // Pop all the frames we must move/replace.
3112 //
3113 // Frame picture (youngest to oldest)
3114 // 1: self-frame (no frame link)
3115 // 2: deopting frame (no frame link)
3116 // 3: caller of deopting frame (could be compiled/interpreted).
3117 //
3118 // Note: by leaving the return address of self-frame on the stack
3119 // and using the size of frame 2 to adjust the stack
3120 // when we are done the return to frame 3 will still be on the stack.
3121
3122 // Pop deoptimized frame
3123 __ movl(rcx, Address(rdi, Deoptimization::UnrollBlock::size_of_deoptimized_frame_offset_in_bytes()));
3124 __ addptr(rsp, rcx);
3125
3126 // rsp should be pointing at the return address to the caller (3)
3127
3128 // Pick up the initial fp we should save
3129 // restore rbp before stack bang because if stack overflow is thrown it needs to be pushed (and preserved)
3130 __ movptr(rbp, Address(rdi, Deoptimization::UnrollBlock::initial_info_offset_in_bytes()));
3131
3132 #ifdef ASSERT
3133 // Compilers generate code that bang the stack by as much as the
3134 // interpreter would need. So this stack banging should never
3135 // trigger a fault. Verify that it does not on non product builds.
3136 if (UseStackBanging) {
3137 __ movl(rbx, Address(rdi, Deoptimization::UnrollBlock::total_frame_sizes_offset_in_bytes()));
3138 __ bang_stack_size(rbx, rcx);
3139 }
3140 #endif
3141
3142 // Load address of array of frame pcs into rcx
3143 __ movptr(rcx, Address(rdi, Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes()));
3144
3145 // Trash the old pc
3146 __ addptr(rsp, wordSize);
3147
3148 // Load address of array of frame sizes into rsi
3149 __ movptr(rsi, Address(rdi, Deoptimization::UnrollBlock::frame_sizes_offset_in_bytes()));
3150
3151 // Load counter into rdx
3152 __ movl(rdx, Address(rdi, Deoptimization::UnrollBlock::number_of_frames_offset_in_bytes()));
3153
3154 // Now adjust the caller's stack to make up for the extra locals
3155 // but record the original sp so that we can save it in the skeletal interpreter
3156 // frame and the stack walking of interpreter_sender will get the unextended sp
3157 // value and not the "real" sp value.
3158
3159 const Register sender_sp = r8;
3160
3161 __ mov(sender_sp, rsp);
3162 __ movl(rbx, Address(rdi,
3163 Deoptimization::UnrollBlock::
3164 caller_adjustment_offset_in_bytes()));
3165 __ subptr(rsp, rbx);
3166
3167 // Push interpreter frames in a loop
3168 Label loop;
3169 __ bind(loop);
3170 __ movptr(rbx, Address(rsi, 0)); // Load frame size
3171 __ subptr(rbx, 2*wordSize); // We'll push pc and ebp by hand
3172 __ pushptr(Address(rcx, 0)); // Save return address
3173 __ enter(); // Save old & set new ebp
3174 __ subptr(rsp, rbx); // Prolog
3175 // This value is corrected by layout_activation_impl
3176 __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD );
3177 __ movptr(Address(rbp, frame::interpreter_frame_sender_sp_offset * wordSize), sender_sp); // Make it walkable
3178 __ mov(sender_sp, rsp); // Pass sender_sp to next frame
3179 __ addptr(rsi, wordSize); // Bump array pointer (sizes)
3180 __ addptr(rcx, wordSize); // Bump array pointer (pcs)
3181 __ decrementl(rdx); // Decrement counter
3182 __ jcc(Assembler::notZero, loop);
3183 __ pushptr(Address(rcx, 0)); // Save final return address
3184
3185 // Re-push self-frame
3186 __ enter(); // Save old & set new ebp
3187
3188 // Allocate a full sized register save area.
3189 // Return address and rbp are in place, so we allocate two less words.
3190 __ subptr(rsp, (frame_size_in_words - 2) * wordSize);
3191
3192 // Restore frame locals after moving the frame
3193 __ movdbl(Address(rsp, RegisterSaver::xmm0_offset_in_bytes()), xmm0);
3194 __ movptr(Address(rsp, RegisterSaver::rax_offset_in_bytes()), rax);
3195
3196 // Call C code. Need thread but NOT official VM entry
3197 // crud. We cannot block on this call, no GC can happen. Call should
3198 // restore return values to their stack-slots with the new SP.
3199 //
3200 // void Deoptimization::unpack_frames(JavaThread* thread, int exec_mode)
3201
3202 // Use rbp because the frames look interpreted now
3203 // Save "the_pc" since it cannot easily be retrieved using the last_java_SP after we aligned SP.
3204 // Don't need the precise return PC here, just precise enough to point into this code blob.
3205 address the_pc = __ pc();
3206 __ set_last_Java_frame(noreg, rbp, the_pc);
3207
3208 __ andptr(rsp, -(StackAlignmentInBytes)); // Fix stack alignment as required by ABI
3209 __ mov(c_rarg0, r15_thread);
3210 __ movl(c_rarg1, r14); // second arg: exec_mode
3211 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames)));
3212 // Revert SP alignment after call since we're going to do some SP relative addressing below
3213 __ movptr(rsp, Address(r15_thread, JavaThread::last_Java_sp_offset()));
3214
3215 // Set an oopmap for the call site
3216 // Use the same PC we used for the last java frame
3217 oop_maps->add_gc_map(the_pc - start,
3218 new OopMap( frame_size_in_words, 0 ));
3219
3220 // Clear fp AND pc
3221 __ reset_last_Java_frame(true);
3222
3223 // Collect return values
3224 __ movdbl(xmm0, Address(rsp, RegisterSaver::xmm0_offset_in_bytes()));
3225 __ movptr(rax, Address(rsp, RegisterSaver::rax_offset_in_bytes()));
3226 // I think this is useless (throwing pc?)
3227 __ movptr(rdx, Address(rsp, RegisterSaver::rdx_offset_in_bytes()));
3228
3229 // Pop self-frame.
3230 __ leave(); // Epilog
3231
3232 // Jump to interpreter
3233 __ ret(0);
3234
3235 // Make sure all code is generated
3236 masm->flush();
3237
3238 _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset, reexecute_offset, frame_size_in_words);
3239 _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset);
3240 #if INCLUDE_JVMCI
3241 if (EnableJVMCI || UseAOT) {
3242 _deopt_blob->set_uncommon_trap_offset(uncommon_trap_offset);
3243 _deopt_blob->set_implicit_exception_uncommon_trap_offset(implicit_exception_uncommon_trap_offset);
3244 }
3245 #endif
3246 }
3247
3248 #ifdef COMPILER2
3249 //------------------------------generate_uncommon_trap_blob--------------------
3250 void SharedRuntime::generate_uncommon_trap_blob() {
3251 // Allocate space for the code
3252 ResourceMark rm;
3253 // Setup code generation tools
3254 CodeBuffer buffer("uncommon_trap_blob", 2048, 1024);
3255 MacroAssembler* masm = new MacroAssembler(&buffer);
3256
3257 assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned");
3258
3259 address start = __ pc();
3260
3261 if (UseRTMLocking) {
3262 // Abort RTM transaction before possible nmethod deoptimization.
3263 __ xabort(0);
3264 }
3265
3266 // Push self-frame. We get here with a return address on the
3267 // stack, so rsp is 8-byte aligned until we allocate our frame.
3268 __ subptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Epilog!
3269
3270 // No callee saved registers. rbp is assumed implicitly saved
3271 __ movptr(Address(rsp, SimpleRuntimeFrame::rbp_off << LogBytesPerInt), rbp);
3272
3273 // compiler left unloaded_class_index in j_rarg0 move to where the
3274 // runtime expects it.
3275 __ movl(c_rarg1, j_rarg0);
3276
3277 __ set_last_Java_frame(noreg, noreg, NULL);
3278
3279 // Call C code. Need thread but NOT official VM entry
3280 // crud. We cannot block on this call, no GC can happen. Call should
3281 // capture callee-saved registers as well as return values.
3282 // Thread is in rdi already.
3283 //
3284 // UnrollBlock* uncommon_trap(JavaThread* thread, jint unloaded_class_index);
3285
3286 __ mov(c_rarg0, r15_thread);
3287 __ movl(c_rarg2, Deoptimization::Unpack_uncommon_trap);
3288 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::uncommon_trap)));
3289
3290 // Set an oopmap for the call site
3291 OopMapSet* oop_maps = new OopMapSet();
3292 OopMap* map = new OopMap(SimpleRuntimeFrame::framesize, 0);
3293
3294 // location of rbp is known implicitly by the frame sender code
3295
3296 oop_maps->add_gc_map(__ pc() - start, map);
3297
3298 __ reset_last_Java_frame(false);
3299
3300 // Load UnrollBlock* into rdi
3301 __ mov(rdi, rax);
3302
3303 #ifdef ASSERT
3304 { Label L;
3305 __ cmpptr(Address(rdi, Deoptimization::UnrollBlock::unpack_kind_offset_in_bytes()),
3306 (int32_t)Deoptimization::Unpack_uncommon_trap);
3307 __ jcc(Assembler::equal, L);
3308 __ stop("SharedRuntime::generate_deopt_blob: expected Unpack_uncommon_trap");
3309 __ bind(L);
3310 }
3311 #endif
3312
3313 // Pop all the frames we must move/replace.
3314 //
3315 // Frame picture (youngest to oldest)
3316 // 1: self-frame (no frame link)
3317 // 2: deopting frame (no frame link)
3318 // 3: caller of deopting frame (could be compiled/interpreted).
3319
3320 // Pop self-frame. We have no frame, and must rely only on rax and rsp.
3321 __ addptr(rsp, (SimpleRuntimeFrame::framesize - 2) << LogBytesPerInt); // Epilog!
3322
3323 // Pop deoptimized frame (int)
3324 __ movl(rcx, Address(rdi,
3325 Deoptimization::UnrollBlock::
3326 size_of_deoptimized_frame_offset_in_bytes()));
3327 __ addptr(rsp, rcx);
3328
3329 // rsp should be pointing at the return address to the caller (3)
3330
3331 // Pick up the initial fp we should save
3332 // restore rbp before stack bang because if stack overflow is thrown it needs to be pushed (and preserved)
3333 __ movptr(rbp, Address(rdi, Deoptimization::UnrollBlock::initial_info_offset_in_bytes()));
3334
3335 #ifdef ASSERT
3336 // Compilers generate code that bang the stack by as much as the
3337 // interpreter would need. So this stack banging should never
3338 // trigger a fault. Verify that it does not on non product builds.
3339 if (UseStackBanging) {
3340 __ movl(rbx, Address(rdi ,Deoptimization::UnrollBlock::total_frame_sizes_offset_in_bytes()));
3341 __ bang_stack_size(rbx, rcx);
3342 }
3343 #endif
3344
3345 // Load address of array of frame pcs into rcx (address*)
3346 __ movptr(rcx, Address(rdi, Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes()));
3347
3348 // Trash the return pc
3349 __ addptr(rsp, wordSize);
3350
3351 // Load address of array of frame sizes into rsi (intptr_t*)
3352 __ movptr(rsi, Address(rdi, Deoptimization::UnrollBlock:: frame_sizes_offset_in_bytes()));
3353
3354 // Counter
3355 __ movl(rdx, Address(rdi, Deoptimization::UnrollBlock:: number_of_frames_offset_in_bytes())); // (int)
3356
3357 // Now adjust the caller's stack to make up for the extra locals but
3358 // record the original sp so that we can save it in the skeletal
3359 // interpreter frame and the stack walking of interpreter_sender
3360 // will get the unextended sp value and not the "real" sp value.
3361
3362 const Register sender_sp = r8;
3363
3364 __ mov(sender_sp, rsp);
3365 __ movl(rbx, Address(rdi, Deoptimization::UnrollBlock:: caller_adjustment_offset_in_bytes())); // (int)
3366 __ subptr(rsp, rbx);
3367
3368 // Push interpreter frames in a loop
3369 Label loop;
3370 __ bind(loop);
3371 __ movptr(rbx, Address(rsi, 0)); // Load frame size
3372 __ subptr(rbx, 2 * wordSize); // We'll push pc and rbp by hand
3373 __ pushptr(Address(rcx, 0)); // Save return address
3374 __ enter(); // Save old & set new rbp
3375 __ subptr(rsp, rbx); // Prolog
3376 __ movptr(Address(rbp, frame::interpreter_frame_sender_sp_offset * wordSize),
3377 sender_sp); // Make it walkable
3378 // This value is corrected by layout_activation_impl
3379 __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD );
3380 __ mov(sender_sp, rsp); // Pass sender_sp to next frame
3381 __ addptr(rsi, wordSize); // Bump array pointer (sizes)
3382 __ addptr(rcx, wordSize); // Bump array pointer (pcs)
3383 __ decrementl(rdx); // Decrement counter
3384 __ jcc(Assembler::notZero, loop);
3385 __ pushptr(Address(rcx, 0)); // Save final return address
3386
3387 // Re-push self-frame
3388 __ enter(); // Save old & set new rbp
3389 __ subptr(rsp, (SimpleRuntimeFrame::framesize - 4) << LogBytesPerInt);
3390 // Prolog
3391
3392 // Use rbp because the frames look interpreted now
3393 // Save "the_pc" since it cannot easily be retrieved using the last_java_SP after we aligned SP.
3394 // Don't need the precise return PC here, just precise enough to point into this code blob.
3395 address the_pc = __ pc();
3396 __ set_last_Java_frame(noreg, rbp, the_pc);
3397
3398 // Call C code. Need thread but NOT official VM entry
3399 // crud. We cannot block on this call, no GC can happen. Call should
3400 // restore return values to their stack-slots with the new SP.
3401 // Thread is in rdi already.
3402 //
3403 // BasicType unpack_frames(JavaThread* thread, int exec_mode);
3404
3405 __ andptr(rsp, -(StackAlignmentInBytes)); // Align SP as required by ABI
3406 __ mov(c_rarg0, r15_thread);
3407 __ movl(c_rarg1, Deoptimization::Unpack_uncommon_trap);
3408 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames)));
3409
3410 // Set an oopmap for the call site
3411 // Use the same PC we used for the last java frame
3412 oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0));
3413
3414 // Clear fp AND pc
3415 __ reset_last_Java_frame(true);
3416
3417 // Pop self-frame.
3418 __ leave(); // Epilog
3419
3420 // Jump to interpreter
3421 __ ret(0);
3422
3423 // Make sure all code is generated
3424 masm->flush();
3425
3426 _uncommon_trap_blob = UncommonTrapBlob::create(&buffer, oop_maps,
3427 SimpleRuntimeFrame::framesize >> 1);
3428 }
3429 #endif // COMPILER2
3430
3431
3432 //------------------------------generate_handler_blob------
3433 //
3434 // Generate a special Compile2Runtime blob that saves all registers,
3435 // and setup oopmap.
3436 //
3437 SafepointBlob* SharedRuntime::generate_handler_blob(address call_ptr, int poll_type) {
3438 assert(StubRoutines::forward_exception_entry() != NULL,
3439 "must be generated before");
3440
3441 ResourceMark rm;
3442 OopMapSet *oop_maps = new OopMapSet();
3443 OopMap* map;
3444
3445 // Allocate space for the code. Setup code generation tools.
3446 CodeBuffer buffer("handler_blob", 2048, 1024);
3447 MacroAssembler* masm = new MacroAssembler(&buffer);
3448
3449 address start = __ pc();
3450 address call_pc = NULL;
3451 int frame_size_in_words;
3452 bool cause_return = (poll_type == POLL_AT_RETURN);
3453 bool save_vectors = (poll_type == POLL_AT_VECTOR_LOOP);
3454
3455 if (UseRTMLocking) {
3456 // Abort RTM transaction before calling runtime
3457 // because critical section will be large and will be
3458 // aborted anyway. Also nmethod could be deoptimized.
3459 __ xabort(0);
3460 }
3461
3462 // Make room for return address (or push it again)
3463 if (!cause_return) {
3464 __ push(rbx);
3465 }
3466
3467 // Save registers, fpu state, and flags
3468 map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words, save_vectors);
3469
3470 // The following is basically a call_VM. However, we need the precise
3471 // address of the call in order to generate an oopmap. Hence, we do all the
3472 // work outselves.
3473
3474 __ set_last_Java_frame(noreg, noreg, NULL);
3475
3476 // The return address must always be correct so that frame constructor never
3477 // sees an invalid pc.
3478
3479 if (!cause_return) {
3480 // Get the return pc saved by the signal handler and stash it in its appropriate place on the stack.
3481 // Additionally, rbx is a callee saved register and we can look at it later to determine
3482 // if someone changed the return address for us!
3483 __ movptr(rbx, Address(r15_thread, JavaThread::saved_exception_pc_offset()));
3484 __ movptr(Address(rbp, wordSize), rbx);
3485 }
3486
3487 // Do the call
3488 __ mov(c_rarg0, r15_thread);
3489 __ call(RuntimeAddress(call_ptr));
3490
3491 // Set an oopmap for the call site. This oopmap will map all
3492 // oop-registers and debug-info registers as callee-saved. This
3493 // will allow deoptimization at this safepoint to find all possible
3494 // debug-info recordings, as well as let GC find all oops.
3495
3496 oop_maps->add_gc_map( __ pc() - start, map);
3497
3498 Label noException;
3499
3500 __ reset_last_Java_frame(false);
3501
3502 __ cmpptr(Address(r15_thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD);
3503 __ jcc(Assembler::equal, noException);
3504
3505 // Exception pending
3506
3507 RegisterSaver::restore_live_registers(masm, save_vectors);
3508
3509 __ jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
3510
3511 // No exception case
3512 __ bind(noException);
3513
3514 Label no_adjust, bail, no_prefix, not_special;
3515 if (SafepointMechanism::uses_thread_local_poll() && !cause_return) {
3516 // If our stashed return pc was modified by the runtime we avoid touching it
3517 __ cmpptr(rbx, Address(rbp, wordSize));
3518 __ jccb(Assembler::notEqual, no_adjust);
3519
3520 // Skip over the poll instruction.
3521 // See NativeInstruction::is_safepoint_poll()
3522 // Possible encodings:
3523 // 85 00 test %eax,(%rax)
3524 // 85 01 test %eax,(%rcx)
3525 // 85 02 test %eax,(%rdx)
3526 // 85 03 test %eax,(%rbx)
3527 // 85 06 test %eax,(%rsi)
3528 // 85 07 test %eax,(%rdi)
3529 //
3530 // 41 85 00 test %eax,(%r8)
3531 // 41 85 01 test %eax,(%r9)
3532 // 41 85 02 test %eax,(%r10)
3533 // 41 85 03 test %eax,(%r11)
3534 // 41 85 06 test %eax,(%r14)
3535 // 41 85 07 test %eax,(%r15)
3536 //
3537 // 85 04 24 test %eax,(%rsp)
3538 // 41 85 04 24 test %eax,(%r12)
3539 // 85 45 00 test %eax,0x0(%rbp)
3540 // 41 85 45 00 test %eax,0x0(%r13)
3541
3542 __ cmpb(Address(rbx, 0), NativeTstRegMem::instruction_rex_b_prefix);
3543 __ jcc(Assembler::notEqual, no_prefix);
3544 __ addptr(rbx, 1);
3545 __ bind(no_prefix);
3546 #ifdef ASSERT
3547 __ movptr(rax, rbx); // remember where 0x85 should be, for verification below
3548 #endif
3549 // r12/r13/rsp/rbp base encoding takes 3 bytes with the following register values:
3550 // r12/rsp 0x04
3551 // r13/rbp 0x05
3552 __ movzbq(rcx, Address(rbx, 1));
3553 __ andptr(rcx, 0x07); // looking for 0x04 .. 0x05
3554 __ subptr(rcx, 4); // looking for 0x00 .. 0x01
3555 __ cmpptr(rcx, 1);
3556 __ jcc(Assembler::above, not_special);
3557 __ addptr(rbx, 1);
3558 __ bind(not_special);
3559 #ifdef ASSERT
3560 // Verify the correct encoding of the poll we're about to skip.
3561 __ cmpb(Address(rax, 0), NativeTstRegMem::instruction_code_memXregl);
3562 __ jcc(Assembler::notEqual, bail);
3563 // Mask out the modrm bits
3564 __ testb(Address(rax, 1), NativeTstRegMem::modrm_mask);
3565 // rax encodes to 0, so if the bits are nonzero it's incorrect
3566 __ jcc(Assembler::notZero, bail);
3567 #endif
3568 // Adjust return pc forward to step over the safepoint poll instruction
3569 __ addptr(rbx, 2);
3570 __ movptr(Address(rbp, wordSize), rbx);
3571 }
3572
3573 __ bind(no_adjust);
3574 // Normal exit, restore registers and exit.
3575 RegisterSaver::restore_live_registers(masm, save_vectors);
3576 __ ret(0);
3577
3578 #ifdef ASSERT
3579 __ bind(bail);
3580 __ stop("Attempting to adjust pc to skip safepoint poll but the return point is not what we expected");
3581 #endif
3582
3583 // Make sure all code is generated
3584 masm->flush();
3585
3586 // Fill-out other meta info
3587 return SafepointBlob::create(&buffer, oop_maps, frame_size_in_words);
3588 }
3589
3590 //
3591 // generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss
3592 //
3593 // Generate a stub that calls into vm to find out the proper destination
3594 // of a java call. All the argument registers are live at this point
3595 // but since this is generic code we don't know what they are and the caller
3596 // must do any gc of the args.
3597 //
3598 RuntimeStub* SharedRuntime::generate_resolve_blob(address destination, const char* name) {
3599 assert (StubRoutines::forward_exception_entry() != NULL, "must be generated before");
3600
3601 // allocate space for the code
3602 ResourceMark rm;
3603
3604 CodeBuffer buffer(name, 1000, 512);
3605 MacroAssembler* masm = new MacroAssembler(&buffer);
3606
3607 int frame_size_in_words;
3608
3609 OopMapSet *oop_maps = new OopMapSet();
3610 OopMap* map = NULL;
3611
3612 int start = __ offset();
3613
3614 map = RegisterSaver::save_live_registers(masm, 0, &frame_size_in_words);
3615
3616 int frame_complete = __ offset();
3617
3618 __ set_last_Java_frame(noreg, noreg, NULL);
3619
3620 __ mov(c_rarg0, r15_thread);
3621
3622 __ call(RuntimeAddress(destination));
3623
3624
3625 // Set an oopmap for the call site.
3626 // We need this not only for callee-saved registers, but also for volatile
3627 // registers that the compiler might be keeping live across a safepoint.
3628
3629 oop_maps->add_gc_map( __ offset() - start, map);
3630
3631 // rax contains the address we are going to jump to assuming no exception got installed
3632
3633 // clear last_Java_sp
3634 __ reset_last_Java_frame(false);
3635 // check for pending exceptions
3636 Label pending;
3637 __ cmpptr(Address(r15_thread, Thread::pending_exception_offset()), (int32_t)NULL_WORD);
3638 __ jcc(Assembler::notEqual, pending);
3639
3640 // get the returned Method*
3641 __ get_vm_result_2(rbx, r15_thread);
3642 __ movptr(Address(rsp, RegisterSaver::rbx_offset_in_bytes()), rbx);
3643
3644 __ movptr(Address(rsp, RegisterSaver::rax_offset_in_bytes()), rax);
3645
3646 RegisterSaver::restore_live_registers(masm);
3647
3648 // We are back the the original state on entry and ready to go.
3649
3650 __ jmp(rax);
3651
3652 // Pending exception after the safepoint
3653
3654 __ bind(pending);
3655
3656 RegisterSaver::restore_live_registers(masm);
3657
3658 // exception pending => remove activation and forward to exception handler
3659
3660 __ movptr(Address(r15_thread, JavaThread::vm_result_offset()), (int)NULL_WORD);
3661
3662 __ movptr(rax, Address(r15_thread, Thread::pending_exception_offset()));
3663 __ jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
3664
3665 // -------------
3666 // make sure all code is generated
3667 masm->flush();
3668
3669 // return the blob
3670 // frame_size_words or bytes??
3671 return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, frame_size_in_words, oop_maps, true);
3672 }
3673
3674
3675 //------------------------------Montgomery multiplication------------------------
3676 //
3677
3678 #ifndef _WINDOWS
3679
3680 #define ASM_SUBTRACT
3681
3682 #ifdef ASM_SUBTRACT
3683 // Subtract 0:b from carry:a. Return carry.
3684 static unsigned long
3685 sub(unsigned long a[], unsigned long b[], unsigned long carry, long len) {
3686 long i = 0, cnt = len;
3687 unsigned long tmp;
3688 asm volatile("clc; "
3689 "0: ; "
3690 "mov (%[b], %[i], 8), %[tmp]; "
3691 "sbb %[tmp], (%[a], %[i], 8); "
3692 "inc %[i]; dec %[cnt]; "
3693 "jne 0b; "
3694 "mov %[carry], %[tmp]; sbb $0, %[tmp]; "
3695 : [i]"+r"(i), [cnt]"+r"(cnt), [tmp]"=&r"(tmp)
3696 : [a]"r"(a), [b]"r"(b), [carry]"r"(carry)
3697 : "memory");
3698 return tmp;
3699 }
3700 #else // ASM_SUBTRACT
3701 typedef int __attribute__((mode(TI))) int128;
3702
3703 // Subtract 0:b from carry:a. Return carry.
3704 static unsigned long
3705 sub(unsigned long a[], unsigned long b[], unsigned long carry, int len) {
3706 int128 tmp = 0;
3707 int i;
3708 for (i = 0; i < len; i++) {
3709 tmp += a[i];
3710 tmp -= b[i];
3711 a[i] = tmp;
3712 tmp >>= 64;
3713 assert(-1 <= tmp && tmp <= 0, "invariant");
3714 }
3715 return tmp + carry;
3716 }
3717 #endif // ! ASM_SUBTRACT
3718
3719 // Multiply (unsigned) Long A by Long B, accumulating the double-
3720 // length result into the accumulator formed of T0, T1, and T2.
3721 #define MACC(A, B, T0, T1, T2) \
3722 do { \
3723 unsigned long hi, lo; \
3724 __asm__ ("mul %5; add %%rax, %2; adc %%rdx, %3; adc $0, %4" \
3725 : "=&d"(hi), "=a"(lo), "+r"(T0), "+r"(T1), "+g"(T2) \
3726 : "r"(A), "a"(B) : "cc"); \
3727 } while(0)
3728
3729 // As above, but add twice the double-length result into the
3730 // accumulator.
3731 #define MACC2(A, B, T0, T1, T2) \
3732 do { \
3733 unsigned long hi, lo; \
3734 __asm__ ("mul %5; add %%rax, %2; adc %%rdx, %3; adc $0, %4; " \
3735 "add %%rax, %2; adc %%rdx, %3; adc $0, %4" \
3736 : "=&d"(hi), "=a"(lo), "+r"(T0), "+r"(T1), "+g"(T2) \
3737 : "r"(A), "a"(B) : "cc"); \
3738 } while(0)
3739
3740 // Fast Montgomery multiplication. The derivation of the algorithm is
3741 // in A Cryptographic Library for the Motorola DSP56000,
3742 // Dusse and Kaliski, Proc. EUROCRYPT 90, pp. 230-237.
3743
3744 static void __attribute__((noinline))
3745 montgomery_multiply(unsigned long a[], unsigned long b[], unsigned long n[],
3746 unsigned long m[], unsigned long inv, int len) {
3747 unsigned long t0 = 0, t1 = 0, t2 = 0; // Triple-precision accumulator
3748 int i;
3749
3750 assert(inv * n[0] == -1UL, "broken inverse in Montgomery multiply");
3751
3752 for (i = 0; i < len; i++) {
3753 int j;
3754 for (j = 0; j < i; j++) {
3755 MACC(a[j], b[i-j], t0, t1, t2);
3756 MACC(m[j], n[i-j], t0, t1, t2);
3757 }
3758 MACC(a[i], b[0], t0, t1, t2);
3759 m[i] = t0 * inv;
3760 MACC(m[i], n[0], t0, t1, t2);
3761
3762 assert(t0 == 0, "broken Montgomery multiply");
3763
3764 t0 = t1; t1 = t2; t2 = 0;
3765 }
3766
3767 for (i = len; i < 2*len; i++) {
3768 int j;
3769 for (j = i-len+1; j < len; j++) {
3770 MACC(a[j], b[i-j], t0, t1, t2);
3771 MACC(m[j], n[i-j], t0, t1, t2);
3772 }
3773 m[i-len] = t0;
3774 t0 = t1; t1 = t2; t2 = 0;
3775 }
3776
3777 while (t0)
3778 t0 = sub(m, n, t0, len);
3779 }
3780
3781 // Fast Montgomery squaring. This uses asymptotically 25% fewer
3782 // multiplies so it should be up to 25% faster than Montgomery
3783 // multiplication. However, its loop control is more complex and it
3784 // may actually run slower on some machines.
3785
3786 static void __attribute__((noinline))
3787 montgomery_square(unsigned long a[], unsigned long n[],
3788 unsigned long m[], unsigned long inv, int len) {
3789 unsigned long t0 = 0, t1 = 0, t2 = 0; // Triple-precision accumulator
3790 int i;
3791
3792 assert(inv * n[0] == -1UL, "broken inverse in Montgomery multiply");
3793
3794 for (i = 0; i < len; i++) {
3795 int j;
3796 int end = (i+1)/2;
3797 for (j = 0; j < end; j++) {
3798 MACC2(a[j], a[i-j], t0, t1, t2);
3799 MACC(m[j], n[i-j], t0, t1, t2);
3800 }
3801 if ((i & 1) == 0) {
3802 MACC(a[j], a[j], t0, t1, t2);
3803 }
3804 for (; j < i; j++) {
3805 MACC(m[j], n[i-j], t0, t1, t2);
3806 }
3807 m[i] = t0 * inv;
3808 MACC(m[i], n[0], t0, t1, t2);
3809
3810 assert(t0 == 0, "broken Montgomery square");
3811
3812 t0 = t1; t1 = t2; t2 = 0;
3813 }
3814
3815 for (i = len; i < 2*len; i++) {
3816 int start = i-len+1;
3817 int end = start + (len - start)/2;
3818 int j;
3819 for (j = start; j < end; j++) {
3820 MACC2(a[j], a[i-j], t0, t1, t2);
3821 MACC(m[j], n[i-j], t0, t1, t2);
3822 }
3823 if ((i & 1) == 0) {
3824 MACC(a[j], a[j], t0, t1, t2);
3825 }
3826 for (; j < len; j++) {
3827 MACC(m[j], n[i-j], t0, t1, t2);
3828 }
3829 m[i-len] = t0;
3830 t0 = t1; t1 = t2; t2 = 0;
3831 }
3832
3833 while (t0)
3834 t0 = sub(m, n, t0, len);
3835 }
3836
3837 // Swap words in a longword.
3838 static unsigned long swap(unsigned long x) {
3839 return (x << 32) | (x >> 32);
3840 }
3841
3842 // Copy len longwords from s to d, word-swapping as we go. The
3843 // destination array is reversed.
3844 static void reverse_words(unsigned long *s, unsigned long *d, int len) {
3845 d += len;
3846 while(len-- > 0) {
3847 d--;
3848 *d = swap(*s);
3849 s++;
3850 }
3851 }
3852
3853 // The threshold at which squaring is advantageous was determined
3854 // experimentally on an i7-3930K (Ivy Bridge) CPU @ 3.5GHz.
3855 #define MONTGOMERY_SQUARING_THRESHOLD 64
3856
3857 void SharedRuntime::montgomery_multiply(jint *a_ints, jint *b_ints, jint *n_ints,
3858 jint len, jlong inv,
3859 jint *m_ints) {
3860 assert(len % 2 == 0, "array length in montgomery_multiply must be even");
3861 int longwords = len/2;
3862
3863 // Make very sure we don't use so much space that the stack might
3864 // overflow. 512 jints corresponds to an 16384-bit integer and
3865 // will use here a total of 8k bytes of stack space.
3866 int total_allocation = longwords * sizeof (unsigned long) * 4;
3867 guarantee(total_allocation <= 8192, "must be");
3868 unsigned long *scratch = (unsigned long *)alloca(total_allocation);
3869
3870 // Local scratch arrays
3871 unsigned long
3872 *a = scratch + 0 * longwords,
3873 *b = scratch + 1 * longwords,
3874 *n = scratch + 2 * longwords,
3875 *m = scratch + 3 * longwords;
3876
3877 reverse_words((unsigned long *)a_ints, a, longwords);
3878 reverse_words((unsigned long *)b_ints, b, longwords);
3879 reverse_words((unsigned long *)n_ints, n, longwords);
3880
3881 ::montgomery_multiply(a, b, n, m, (unsigned long)inv, longwords);
3882
3883 reverse_words(m, (unsigned long *)m_ints, longwords);
3884 }
3885
3886 void SharedRuntime::montgomery_square(jint *a_ints, jint *n_ints,
3887 jint len, jlong inv,
3888 jint *m_ints) {
3889 assert(len % 2 == 0, "array length in montgomery_square must be even");
3890 int longwords = len/2;
3891
3892 // Make very sure we don't use so much space that the stack might
3893 // overflow. 512 jints corresponds to an 16384-bit integer and
3894 // will use here a total of 6k bytes of stack space.
3895 int total_allocation = longwords * sizeof (unsigned long) * 3;
3896 guarantee(total_allocation <= 8192, "must be");
3897 unsigned long *scratch = (unsigned long *)alloca(total_allocation);
3898
3899 // Local scratch arrays
3900 unsigned long
3901 *a = scratch + 0 * longwords,
3902 *n = scratch + 1 * longwords,
3903 *m = scratch + 2 * longwords;
3904
3905 reverse_words((unsigned long *)a_ints, a, longwords);
3906 reverse_words((unsigned long *)n_ints, n, longwords);
3907
3908 if (len >= MONTGOMERY_SQUARING_THRESHOLD) {
3909 ::montgomery_square(a, n, m, (unsigned long)inv, longwords);
3910 } else {
3911 ::montgomery_multiply(a, a, n, m, (unsigned long)inv, longwords);
3912 }
3913
3914 reverse_words(m, (unsigned long *)m_ints, longwords);
3915 }
3916
3917 #endif // WINDOWS
3918
3919 #ifdef COMPILER2
3920 // This is here instead of runtime_x86_64.cpp because it uses SimpleRuntimeFrame
3921 //
3922 //------------------------------generate_exception_blob---------------------------
3923 // creates exception blob at the end
3924 // Using exception blob, this code is jumped from a compiled method.
3925 // (see emit_exception_handler in x86_64.ad file)
3926 //
3927 // Given an exception pc at a call we call into the runtime for the
3928 // handler in this method. This handler might merely restore state
3929 // (i.e. callee save registers) unwind the frame and jump to the
3930 // exception handler for the nmethod if there is no Java level handler
3931 // for the nmethod.
3932 //
3933 // This code is entered with a jmp.
3934 //
3935 // Arguments:
3936 // rax: exception oop
3937 // rdx: exception pc
3938 //
3939 // Results:
3940 // rax: exception oop
3941 // rdx: exception pc in caller or ???
3942 // destination: exception handler of caller
3943 //
3944 // Note: the exception pc MUST be at a call (precise debug information)
3945 // Registers rax, rdx, rcx, rsi, rdi, r8-r11 are not callee saved.
3946 //
3947
3948 void OptoRuntime::generate_exception_blob() {
3949 assert(!OptoRuntime::is_callee_saved_register(RDX_num), "");
3950 assert(!OptoRuntime::is_callee_saved_register(RAX_num), "");
3951 assert(!OptoRuntime::is_callee_saved_register(RCX_num), "");
3952
3953 assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned");
3954
3955 // Allocate space for the code
3956 ResourceMark rm;
3957 // Setup code generation tools
3958 CodeBuffer buffer("exception_blob", 2048, 1024);
3959 MacroAssembler* masm = new MacroAssembler(&buffer);
3960
3961
3962 address start = __ pc();
3963
3964 // Exception pc is 'return address' for stack walker
3965 __ push(rdx);
3966 __ subptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Prolog
3967
3968 // Save callee-saved registers. See x86_64.ad.
3969
3970 // rbp is an implicitly saved callee saved register (i.e., the calling
3971 // convention will save/restore it in the prolog/epilog). Other than that
3972 // there are no callee save registers now that adapter frames are gone.
3973
3974 __ movptr(Address(rsp, SimpleRuntimeFrame::rbp_off << LogBytesPerInt), rbp);
3975
3976 // Store exception in Thread object. We cannot pass any arguments to the
3977 // handle_exception call, since we do not want to make any assumption
3978 // about the size of the frame where the exception happened in.
3979 // c_rarg0 is either rdi (Linux) or rcx (Windows).
3980 __ movptr(Address(r15_thread, JavaThread::exception_oop_offset()),rax);
3981 __ movptr(Address(r15_thread, JavaThread::exception_pc_offset()), rdx);
3982
3983 // This call does all the hard work. It checks if an exception handler
3984 // exists in the method.
3985 // If so, it returns the handler address.
3986 // If not, it prepares for stack-unwinding, restoring the callee-save
3987 // registers of the frame being removed.
3988 //
3989 // address OptoRuntime::handle_exception_C(JavaThread* thread)
3990
3991 // At a method handle call, the stack may not be properly aligned
3992 // when returning with an exception.
3993 address the_pc = __ pc();
3994 __ set_last_Java_frame(noreg, noreg, the_pc);
3995 __ mov(c_rarg0, r15_thread);
3996 __ andptr(rsp, -(StackAlignmentInBytes)); // Align stack
3997 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C)));
3998
3999 // Set an oopmap for the call site. This oopmap will only be used if we
4000 // are unwinding the stack. Hence, all locations will be dead.
4001 // Callee-saved registers will be the same as the frame above (i.e.,
4002 // handle_exception_stub), since they were restored when we got the
4003 // exception.
4004
4005 OopMapSet* oop_maps = new OopMapSet();
4006
4007 oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0));
4008
4009 __ reset_last_Java_frame(false);
4010
4011 // Restore callee-saved registers
4012
4013 // rbp is an implicitly saved callee-saved register (i.e., the calling
4014 // convention will save restore it in prolog/epilog) Other than that
4015 // there are no callee save registers now that adapter frames are gone.
4016
4017 __ movptr(rbp, Address(rsp, SimpleRuntimeFrame::rbp_off << LogBytesPerInt));
4018
4019 __ addptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Epilog
4020 __ pop(rdx); // No need for exception pc anymore
4021
4022 // rax: exception handler
4023
4024 // We have a handler in rax (could be deopt blob).
4025 __ mov(r8, rax);
4026
4027 // Get the exception oop
4028 __ movptr(rax, Address(r15_thread, JavaThread::exception_oop_offset()));
4029 // Get the exception pc in case we are deoptimized
4030 __ movptr(rdx, Address(r15_thread, JavaThread::exception_pc_offset()));
4031 #ifdef ASSERT
4032 __ movptr(Address(r15_thread, JavaThread::exception_handler_pc_offset()), (int)NULL_WORD);
4033 __ movptr(Address(r15_thread, JavaThread::exception_pc_offset()), (int)NULL_WORD);
4034 #endif
4035 // Clear the exception oop so GC no longer processes it as a root.
4036 __ movptr(Address(r15_thread, JavaThread::exception_oop_offset()), (int)NULL_WORD);
4037
4038 // rax: exception oop
4039 // r8: exception handler
4040 // rdx: exception pc
4041 // Jump to handler
4042
4043 __ jmp(r8);
4044
4045 // Make sure all code is generated
4046 masm->flush();
4047
4048 // Set exception blob
4049 _exception_blob = ExceptionBlob::create(&buffer, oop_maps, SimpleRuntimeFrame::framesize >> 1);
4050 }
4051 #endif // COMPILER2