1 /*
2 * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2007, 2008, 2010, 2015 Red Hat, Inc.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/assembler.hpp"
28 #include "assembler_zero.inline.hpp"
29 #include "interpreter/interpreter.hpp"
30 #include "nativeInst_zero.hpp"
31 #include "oops/instanceOop.hpp"
32 #include "oops/method.hpp"
33 #include "oops/objArrayKlass.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "prims/methodHandles.hpp"
36 #include "runtime/frame.inline.hpp"
37 #include "runtime/handles.inline.hpp"
38 #include "runtime/sharedRuntime.hpp"
39 #include "runtime/stubCodeGenerator.hpp"
40 #include "runtime/stubRoutines.hpp"
41 #include "runtime/thread.inline.hpp"
42 #include "stack_zero.inline.hpp"
43 #ifdef COMPILER2
44 #include "opto/runtime.hpp"
45 #endif
46
47 // For SafeFetch we need POSIX tls and setjmp
48 #include <setjmp.h>
49 #include <pthread.h>
50 static pthread_key_t g_jmpbuf_key;
51
52 // return the currently active jump buffer for this thread
53 // - if there is any, NULL otherwise. Called from
54 // zero signal handlers.
55 extern sigjmp_buf* get_jmp_buf_for_continuation() {
56 return (sigjmp_buf*) pthread_getspecific(g_jmpbuf_key);
57 }
58
59 // Declaration and definition of StubGenerator (no .hpp file).
60 // For a more detailed description of the stub routine structure
61 // see the comment in stubRoutines.hpp
62
63 class StubGenerator: public StubCodeGenerator {
64 private:
65 // The call stub is used to call Java from C
66 static void call_stub(
67 JavaCallWrapper *call_wrapper,
68 intptr_t* result,
69 BasicType result_type,
70 Method* method,
71 address entry_point,
72 intptr_t* parameters,
73 int parameter_words,
74 TRAPS) {
75 JavaThread *thread = (JavaThread *) THREAD;
76 ZeroStack *stack = thread->zero_stack();
77
78 // Make sure we have no pending exceptions
79 assert(!HAS_PENDING_EXCEPTION, "call_stub called with pending exception");
80
81 // Set up the stack if necessary
82 bool stack_needs_teardown = false;
83 if (stack->needs_setup()) {
84 size_t zero_stack_size = stack->suggest_size(thread);
85 stack->setup(alloca(zero_stack_size), zero_stack_size);
86 stack_needs_teardown = true;
87 }
88
89 // Allocate and initialize our frame
90 EntryFrame *frame =
91 EntryFrame::build(parameters, parameter_words, call_wrapper, THREAD);
92
93 if (!HAS_PENDING_EXCEPTION) {
94 // Push the frame
95 thread->push_zero_frame(frame);
96
97 // Make the call
98 Interpreter::invoke_method(method, entry_point, THREAD);
99
100 // Store the result
101 if (!HAS_PENDING_EXCEPTION) {
102 switch (result_type) {
103 case T_INT:
104 *(jint *) result = *(jint *) stack->sp();
105 break;
106 case T_LONG:
107 *(jlong *) result = *(jlong *) stack->sp();
108 break;
109 case T_FLOAT:
110 *(jfloat *) result = *(jfloat *) stack->sp();
111 break;
112 case T_DOUBLE:
113 *(jdouble *) result = *(jdouble *) stack->sp();
114 break;
115 case T_OBJECT:
116 *(oop *) result = *(oop *) stack->sp();
117 break;
118 default:
119 ShouldNotReachHere();
120 }
121 }
122
123 // Unwind the frame
124 thread->pop_zero_frame();
125 }
126
127 // Tear down the stack if necessary
128 if (stack_needs_teardown)
129 stack->teardown();
130 }
131
132 // These stubs get called from some dumb test routine.
133 // I'll write them properly when they're called from
134 // something that's actually doing something.
135 static void fake_arraycopy_stub(address src, address dst, int count) {
136 assert(count == 0, "huh?");
137 }
138
139 void generate_arraycopy_stubs() {
140 // Call the conjoint generation methods immediately after
141 // the disjoint ones so that short branches from the former
142 // to the latter can be generated.
143 StubRoutines::_jbyte_disjoint_arraycopy = (address) fake_arraycopy_stub;
144 StubRoutines::_jbyte_arraycopy = (address) fake_arraycopy_stub;
145
146 StubRoutines::_jshort_disjoint_arraycopy = (address) fake_arraycopy_stub;
147 StubRoutines::_jshort_arraycopy = (address) fake_arraycopy_stub;
148
149 StubRoutines::_jint_disjoint_arraycopy = (address) fake_arraycopy_stub;
150 StubRoutines::_jint_arraycopy = (address) fake_arraycopy_stub;
151
152 StubRoutines::_jlong_disjoint_arraycopy = (address) fake_arraycopy_stub;
153 StubRoutines::_jlong_arraycopy = (address) fake_arraycopy_stub;
154
155 StubRoutines::_oop_disjoint_arraycopy = ShouldNotCallThisStub();
156 StubRoutines::_oop_arraycopy = ShouldNotCallThisStub();
157
158 StubRoutines::_checkcast_arraycopy = ShouldNotCallThisStub();
159 StubRoutines::_unsafe_arraycopy = ShouldNotCallThisStub();
160 StubRoutines::_generic_arraycopy = ShouldNotCallThisStub();
161
162 // We don't generate specialized code for HeapWord-aligned source
163 // arrays, so just use the code we've already generated
164 StubRoutines::_arrayof_jbyte_disjoint_arraycopy =
165 StubRoutines::_jbyte_disjoint_arraycopy;
166 StubRoutines::_arrayof_jbyte_arraycopy =
167 StubRoutines::_jbyte_arraycopy;
168
169 StubRoutines::_arrayof_jshort_disjoint_arraycopy =
170 StubRoutines::_jshort_disjoint_arraycopy;
171 StubRoutines::_arrayof_jshort_arraycopy =
172 StubRoutines::_jshort_arraycopy;
173
174 StubRoutines::_arrayof_jint_disjoint_arraycopy =
175 StubRoutines::_jint_disjoint_arraycopy;
176 StubRoutines::_arrayof_jint_arraycopy =
177 StubRoutines::_jint_arraycopy;
178
179 StubRoutines::_arrayof_jlong_disjoint_arraycopy =
180 StubRoutines::_jlong_disjoint_arraycopy;
181 StubRoutines::_arrayof_jlong_arraycopy =
182 StubRoutines::_jlong_arraycopy;
183
184 StubRoutines::_arrayof_oop_disjoint_arraycopy =
185 StubRoutines::_oop_disjoint_arraycopy;
186 StubRoutines::_arrayof_oop_arraycopy =
187 StubRoutines::_oop_arraycopy;
188 }
189
190 static int SafeFetch32(int *adr, int errValue) {
191
192 // set up a jump buffer; anchor the pointer to the jump buffer in tls; then
193 // do the pointer access. If pointer is invalid, we crash; in signal
194 // handler, we retrieve pointer to jmp buffer from tls, and jump back.
195 //
196 // Note: the jump buffer itself - which can get pretty large depending on
197 // the architecture - lives on the stack and that is fine, because we will
198 // not rewind the stack: either we crash, in which case signal handler
199 // frame is below us, or we don't crash, in which case it does not matter.
200 sigjmp_buf jb;
201 if (sigsetjmp(jb, 1)) {
202 // we crashed. clean up tls and return default value.
203 pthread_setspecific(g_jmpbuf_key, NULL);
204 return errValue;
205 } else {
206 // preparation phase
207 pthread_setspecific(g_jmpbuf_key, &jb);
208 }
209
210 int value = errValue;
211 value = *adr;
212
213 // all went well. clean tls.
214 pthread_setspecific(g_jmpbuf_key, NULL);
215
216 return value;
217 }
218
219 static intptr_t SafeFetchN(intptr_t *adr, intptr_t errValue) {
220
221 sigjmp_buf jb;
222 if (sigsetjmp(jb, 1)) {
223 // we crashed. clean up tls and return default value.
224 pthread_setspecific(g_jmpbuf_key, NULL);
225 return errValue;
226 } else {
227 // preparation phase
228 pthread_setspecific(g_jmpbuf_key, &jb);
229 }
230
231 intptr_t value = errValue;
232 value = *adr;
233
234 // all went well. clean tls.
235 pthread_setspecific(g_jmpbuf_key, NULL);
236
237 return value;
238
239 }
240
241 void generate_initial() {
242 // Generates all stubs and initializes the entry points
243
244 // entry points that exist in all platforms Note: This is code
245 // that could be shared among different platforms - however the
246 // benefit seems to be smaller than the disadvantage of having a
247 // much more complicated generator structure. See also comment in
248 // stubRoutines.hpp.
249
250 StubRoutines::_forward_exception_entry = ShouldNotCallThisStub();
251 StubRoutines::_call_stub_entry = (address) call_stub;
252 StubRoutines::_catch_exception_entry = ShouldNotCallThisStub();
253
254 // atomic calls
255 StubRoutines::_atomic_xchg_entry = ShouldNotCallThisStub();
256 StubRoutines::_atomic_xchg_ptr_entry = ShouldNotCallThisStub();
257 StubRoutines::_atomic_cmpxchg_entry = ShouldNotCallThisStub();
258 StubRoutines::_atomic_cmpxchg_ptr_entry = ShouldNotCallThisStub();
259 StubRoutines::_atomic_cmpxchg_byte_entry = ShouldNotCallThisStub();
260 StubRoutines::_atomic_cmpxchg_long_entry = ShouldNotCallThisStub();
261 StubRoutines::_atomic_add_entry = ShouldNotCallThisStub();
262 StubRoutines::_atomic_add_ptr_entry = ShouldNotCallThisStub();
263 StubRoutines::_fence_entry = ShouldNotCallThisStub();
264 }
265
266 void generate_all() {
267 // Generates all stubs and initializes the entry points
268
269 // These entry points require SharedInfo::stack0 to be set up in
270 // non-core builds and need to be relocatable, so they each
271 // fabricate a RuntimeStub internally.
272 StubRoutines::_throw_AbstractMethodError_entry =
273 ShouldNotCallThisStub();
274
275 StubRoutines::_throw_NullPointerException_at_call_entry =
276 ShouldNotCallThisStub();
277
278 StubRoutines::_throw_StackOverflowError_entry =
279 ShouldNotCallThisStub();
280
281 // support for verify_oop (must happen after universe_init)
282 StubRoutines::_verify_oop_subroutine_entry =
283 ShouldNotCallThisStub();
284
285 // arraycopy stubs used by compilers
286 generate_arraycopy_stubs();
287
288 // Safefetch stubs.
289 pthread_key_create(&g_jmpbuf_key, NULL);
290 StubRoutines::_safefetch32_entry = CAST_FROM_FN_PTR(address, StubGenerator::SafeFetch32);
291 StubRoutines::_safefetch32_fault_pc = NULL;
292 StubRoutines::_safefetch32_continuation_pc = NULL;
293
294 StubRoutines::_safefetchN_entry = CAST_FROM_FN_PTR(address, StubGenerator::SafeFetchN);
295 StubRoutines::_safefetchN_fault_pc = NULL;
296 StubRoutines::_safefetchN_continuation_pc = NULL;
297 }
298
299 public:
300 StubGenerator(CodeBuffer* code, bool all) : StubCodeGenerator(code) {
301 if (all) {
302 generate_all();
303 } else {
304 generate_initial();
305 }
306 }
307 };
308
309 void StubGenerator_generate(CodeBuffer* code, bool all) {
310 StubGenerator g(code, all);
311 }
312
313 EntryFrame *EntryFrame::build(const intptr_t* parameters,
314 int parameter_words,
315 JavaCallWrapper* call_wrapper,
316 TRAPS) {
317
318 ZeroStack *stack = ((JavaThread *) THREAD)->zero_stack();
319 stack->overflow_check(header_words + parameter_words, CHECK_NULL);
320
321 stack->push(0); // next_frame, filled in later
322 intptr_t *fp = stack->sp();
323 assert(fp - stack->sp() == next_frame_off, "should be");
324
325 stack->push(ENTRY_FRAME);
326 assert(fp - stack->sp() == frame_type_off, "should be");
327
328 stack->push((intptr_t) call_wrapper);
329 assert(fp - stack->sp() == call_wrapper_off, "should be");
330
331 for (int i = 0; i < parameter_words; i++)
332 stack->push(parameters[i]);
333
334 return (EntryFrame *) fp;
335 }