1 /* 2 * Copyright (c) 1997, 2011, 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 #ifndef CPU_X86_VM_NATIVEINST_X86_HPP 26 #define CPU_X86_VM_NATIVEINST_X86_HPP 27 28 #include "asm/assembler.hpp" 29 #include "memory/allocation.hpp" 30 #include "runtime/icache.hpp" 31 #include "runtime/os.hpp" 32 #include "utilities/top.hpp" 33 34 // We have interfaces for the following instructions: 35 // - NativeInstruction 36 // - - NativeCall 37 // - - NativeMovConstReg 38 // - - NativeMovConstRegPatching 39 // - - NativeMovRegMem 40 // - - NativeMovRegMemPatching 41 // - - NativeJump 42 // - - NativeIllegalOpCode 43 // - - NativeGeneralJump 44 // - - NativeReturn 45 // - - NativeReturnX (return with argument) 46 // - - NativePushConst 47 // - - NativeTstRegMem 48 49 // The base class for different kinds of native instruction abstractions. 50 // Provides the primitive operations to manipulate code relative to this. 51 52 class NativeInstruction VALUE_OBJ_CLASS_SPEC { 53 friend class Relocation; 54 55 public: 56 enum Intel_specific_constants { 57 nop_instruction_code = 0x90, 58 nop_instruction_size = 1 59 }; 60 61 bool is_nop() { return ubyte_at(0) == nop_instruction_code; } 62 bool is_dtrace_trap(); 63 inline bool is_call(); 64 inline bool is_illegal(); 65 inline bool is_return(); 66 inline bool is_jump(); 67 inline bool is_cond_jump(); 68 inline bool is_safepoint_poll(); 69 inline bool is_mov_literal64(); 70 71 protected: 72 address addr_at(int offset) const { return address(this) + offset; } 73 74 s_char sbyte_at(int offset) const { return *(s_char*) addr_at(offset); } 75 u_char ubyte_at(int offset) const { return *(u_char*) addr_at(offset); } 76 77 jint int_at(int offset) const { return *(jint*) addr_at(offset); } 78 79 intptr_t ptr_at(int offset) const { return *(intptr_t*) addr_at(offset); } 80 81 oop oop_at (int offset) const { return *(oop*) addr_at(offset); } 82 83 84 void set_char_at(int offset, char c) { *addr_at(offset) = (u_char)c; wrote(offset); } 85 void set_int_at(int offset, jint i) { *(jint*)addr_at(offset) = i; wrote(offset); } 86 void set_ptr_at (int offset, intptr_t ptr) { *(intptr_t*) addr_at(offset) = ptr; wrote(offset); } 87 void set_oop_at (int offset, oop o) { *(oop*) addr_at(offset) = o; wrote(offset); } 88 89 // This doesn't really do anything on Intel, but it is the place where 90 // cache invalidation belongs, generically: 91 void wrote(int offset); 92 93 public: 94 95 // unit test stuff 96 static void test() {} // override for testing 97 98 inline friend NativeInstruction* nativeInstruction_at(address address); 99 }; 100 101 inline NativeInstruction* nativeInstruction_at(address address) { 102 NativeInstruction* inst = (NativeInstruction*)address; 103 #ifdef ASSERT 104 //inst->verify(); 105 #endif 106 return inst; 107 } 108 109 inline NativeCall* nativeCall_at(address address); 110 // The NativeCall is an abstraction for accessing/manipulating native call imm32/rel32off 111 // instructions (used to manipulate inline caches, primitive & dll calls, etc.). 112 113 class NativeCall: public NativeInstruction { 114 public: 115 enum Intel_specific_constants { 116 instruction_code = 0xE8, 117 instruction_size = 5, 118 instruction_offset = 0, 119 displacement_offset = 1, 120 return_address_offset = 5 121 }; 122 123 enum { cache_line_size = BytesPerWord }; // conservative estimate! 124 125 address instruction_address() const { return addr_at(instruction_offset); } 126 address next_instruction_address() const { return addr_at(return_address_offset); } 127 int displacement() const { return (jint) int_at(displacement_offset); } 128 address displacement_address() const { return addr_at(displacement_offset); } 129 address return_address() const { return addr_at(return_address_offset); } 130 address destination() const; 131 void set_destination(address dest) { 132 #ifdef AMD64 133 assert((labs((intptr_t) dest - (intptr_t) return_address()) & 134 0xFFFFFFFF00000000) == 0, 135 "must be 32bit offset"); 136 #endif // AMD64 137 set_int_at(displacement_offset, dest - return_address()); 138 } 139 void set_destination_mt_safe(address dest); 140 141 void verify_alignment() { assert((intptr_t)addr_at(displacement_offset) % BytesPerInt == 0, "must be aligned"); } 142 void verify(); 143 void print(); 144 145 // Creation 146 inline friend NativeCall* nativeCall_at(address address); 147 inline friend NativeCall* nativeCall_before(address return_address); 148 149 static bool is_call_at(address instr) { 150 return ((*instr) & 0xFF) == NativeCall::instruction_code; 151 } 152 153 static bool is_call_before(address return_address) { 154 return is_call_at(return_address - NativeCall::return_address_offset); 155 } 156 157 static bool is_call_to(address instr, address target) { 158 return nativeInstruction_at(instr)->is_call() && 159 nativeCall_at(instr)->destination() == target; 160 } 161 162 // MT-safe patching of a call instruction. 163 static void insert(address code_pos, address entry); 164 165 static void replace_mt_safe(address instr_addr, address code_buffer); 166 }; 167 168 inline NativeCall* nativeCall_at(address address) { 169 NativeCall* call = (NativeCall*)(address - NativeCall::instruction_offset); 170 #ifdef ASSERT 171 call->verify(); 172 #endif 173 return call; 174 } 175 176 inline NativeCall* nativeCall_before(address return_address) { 177 NativeCall* call = (NativeCall*)(return_address - NativeCall::return_address_offset); 178 #ifdef ASSERT 179 call->verify(); 180 #endif 181 return call; 182 } 183 184 // An interface for accessing/manipulating native mov reg, imm32 instructions. 185 // (used to manipulate inlined 32bit data dll calls, etc.) 186 class NativeMovConstReg: public NativeInstruction { 187 #ifdef AMD64 188 static const bool has_rex = true; 189 static const int rex_size = 1; 190 #else 191 static const bool has_rex = false; 192 static const int rex_size = 0; 193 #endif // AMD64 194 public: 195 enum Intel_specific_constants { 196 instruction_code = 0xB8, 197 instruction_size = 1 + rex_size + wordSize, 198 instruction_offset = 0, 199 data_offset = 1 + rex_size, 200 next_instruction_offset = instruction_size, 201 register_mask = 0x07 202 }; 203 204 address instruction_address() const { return addr_at(instruction_offset); } 205 address next_instruction_address() const { return addr_at(next_instruction_offset); } 206 intptr_t data() const { return ptr_at(data_offset); } 207 void set_data(intptr_t x) { set_ptr_at(data_offset, x); } 208 209 void verify(); 210 void print(); 211 212 // unit test stuff 213 static void test() {} 214 215 // Creation 216 inline friend NativeMovConstReg* nativeMovConstReg_at(address address); 217 inline friend NativeMovConstReg* nativeMovConstReg_before(address address); 218 }; 219 220 inline NativeMovConstReg* nativeMovConstReg_at(address address) { 221 NativeMovConstReg* test = (NativeMovConstReg*)(address - NativeMovConstReg::instruction_offset); 222 #ifdef ASSERT 223 test->verify(); 224 #endif 225 return test; 226 } 227 228 inline NativeMovConstReg* nativeMovConstReg_before(address address) { 229 NativeMovConstReg* test = (NativeMovConstReg*)(address - NativeMovConstReg::instruction_size - NativeMovConstReg::instruction_offset); 230 #ifdef ASSERT 231 test->verify(); 232 #endif 233 return test; 234 } 235 236 class NativeMovConstRegPatching: public NativeMovConstReg { 237 private: 238 friend NativeMovConstRegPatching* nativeMovConstRegPatching_at(address address) { 239 NativeMovConstRegPatching* test = (NativeMovConstRegPatching*)(address - instruction_offset); 240 #ifdef ASSERT 241 test->verify(); 242 #endif 243 return test; 244 } 245 }; 246 247 // An interface for accessing/manipulating native moves of the form: 248 // mov[b/w/l/q] [reg + offset], reg (instruction_code_reg2mem) 249 // mov[b/w/l/q] reg, [reg+offset] (instruction_code_mem2reg 250 // mov[s/z]x[w/b/q] [reg + offset], reg 251 // fld_s [reg+offset] 252 // fld_d [reg+offset] 253 // fstp_s [reg + offset] 254 // fstp_d [reg + offset] 255 // mov_literal64 scratch,<pointer> ; mov[b/w/l/q] 0(scratch),reg | mov[b/w/l/q] reg,0(scratch) 256 // 257 // Warning: These routines must be able to handle any instruction sequences 258 // that are generated as a result of the load/store byte,word,long 259 // macros. For example: The load_unsigned_byte instruction generates 260 // an xor reg,reg inst prior to generating the movb instruction. This 261 // class must skip the xor instruction. 262 263 class NativeMovRegMem: public NativeInstruction { 264 public: 265 enum Intel_specific_constants { 266 instruction_prefix_wide_lo = Assembler::REX, 267 instruction_prefix_wide_hi = Assembler::REX_WRXB, 268 instruction_code_xor = 0x33, 269 instruction_extended_prefix = 0x0F, 270 instruction_code_mem2reg_movslq = 0x63, 271 instruction_code_mem2reg_movzxb = 0xB6, 272 instruction_code_mem2reg_movsxb = 0xBE, 273 instruction_code_mem2reg_movzxw = 0xB7, 274 instruction_code_mem2reg_movsxw = 0xBF, 275 instruction_operandsize_prefix = 0x66, 276 instruction_code_reg2mem = 0x89, 277 instruction_code_mem2reg = 0x8b, 278 instruction_code_reg2memb = 0x88, 279 instruction_code_mem2regb = 0x8a, 280 instruction_code_float_s = 0xd9, 281 instruction_code_float_d = 0xdd, 282 instruction_code_long_volatile = 0xdf, 283 instruction_code_xmm_ss_prefix = 0xf3, 284 instruction_code_xmm_sd_prefix = 0xf2, 285 instruction_code_xmm_code = 0x0f, 286 instruction_code_xmm_load = 0x10, 287 instruction_code_xmm_store = 0x11, 288 instruction_code_xmm_lpd = 0x12, 289 290 instruction_size = 4, 291 instruction_offset = 0, 292 data_offset = 2, 293 next_instruction_offset = 4 294 }; 295 296 // helper 297 int instruction_start() const; 298 299 address instruction_address() const; 300 301 address next_instruction_address() const; 302 303 int offset() const; 304 305 void set_offset(int x); 306 307 void add_offset_in_bytes(int add_offset) { set_offset ( ( offset() + add_offset ) ); } 308 309 void verify(); 310 void print (); 311 312 // unit test stuff 313 static void test() {} 314 315 private: 316 inline friend NativeMovRegMem* nativeMovRegMem_at (address address); 317 }; 318 319 inline NativeMovRegMem* nativeMovRegMem_at (address address) { 320 NativeMovRegMem* test = (NativeMovRegMem*)(address - NativeMovRegMem::instruction_offset); 321 #ifdef ASSERT 322 test->verify(); 323 #endif 324 return test; 325 } 326 327 class NativeMovRegMemPatching: public NativeMovRegMem { 328 private: 329 friend NativeMovRegMemPatching* nativeMovRegMemPatching_at (address address) { 330 NativeMovRegMemPatching* test = (NativeMovRegMemPatching*)(address - instruction_offset); 331 #ifdef ASSERT 332 test->verify(); 333 #endif 334 return test; 335 } 336 }; 337 338 339 340 // An interface for accessing/manipulating native leal instruction of form: 341 // leal reg, [reg + offset] 342 343 class NativeLoadAddress: public NativeMovRegMem { 344 #ifdef AMD64 345 static const bool has_rex = true; 346 static const int rex_size = 1; 347 #else 348 static const bool has_rex = false; 349 static const int rex_size = 0; 350 #endif // AMD64 351 public: 352 enum Intel_specific_constants { 353 instruction_prefix_wide = Assembler::REX_W, 354 instruction_prefix_wide_extended = Assembler::REX_WB, 355 lea_instruction_code = 0x8D, 356 mov64_instruction_code = 0xB8 357 }; 358 359 void verify(); 360 void print (); 361 362 // unit test stuff 363 static void test() {} 364 365 private: 366 friend NativeLoadAddress* nativeLoadAddress_at (address address) { 367 NativeLoadAddress* test = (NativeLoadAddress*)(address - instruction_offset); 368 #ifdef ASSERT 369 test->verify(); 370 #endif 371 return test; 372 } 373 }; 374 375 // jump rel32off 376 377 class NativeJump: public NativeInstruction { 378 public: 379 enum Intel_specific_constants { 380 instruction_code = 0xe9, 381 instruction_size = 5, 382 instruction_offset = 0, 383 data_offset = 1, 384 next_instruction_offset = 5 385 }; 386 387 address instruction_address() const { return addr_at(instruction_offset); } 388 address next_instruction_address() const { return addr_at(next_instruction_offset); } 389 address jump_destination() const { 390 address dest = (int_at(data_offset)+next_instruction_address()); 391 // 32bit used to encode unresolved jmp as jmp -1 392 // 64bit can't produce this so it used jump to self. 393 // Now 32bit and 64bit use jump to self as the unresolved address 394 // which the inline cache code (and relocs) know about 395 396 // return -1 if jump to self 397 dest = (dest == (address) this) ? (address) -1 : dest; 398 return dest; 399 } 400 401 void set_jump_destination(address dest) { 402 intptr_t val = dest - next_instruction_address(); 403 if (dest == (address) -1) { 404 val = -5; // jump to self 405 } 406 #ifdef AMD64 407 assert((labs(val) & 0xFFFFFFFF00000000) == 0 || dest == (address)-1, "must be 32bit offset or -1"); 408 #endif // AMD64 409 set_int_at(data_offset, (jint)val); 410 } 411 412 // Creation 413 inline friend NativeJump* nativeJump_at(address address); 414 415 void verify(); 416 417 // Unit testing stuff 418 static void test() {} 419 420 // Insertion of native jump instruction 421 static void insert(address code_pos, address entry); 422 // MT-safe insertion of native jump at verified method entry 423 static void check_verified_entry_alignment(address entry, address verified_entry); 424 static void patch_verified_entry(address entry, address verified_entry, address dest); 425 }; 426 427 inline NativeJump* nativeJump_at(address address) { 428 NativeJump* jump = (NativeJump*)(address - NativeJump::instruction_offset); 429 #ifdef ASSERT 430 jump->verify(); 431 #endif 432 return jump; 433 } 434 435 // Handles all kinds of jump on Intel. Long/far, conditional/unconditional 436 class NativeGeneralJump: public NativeInstruction { 437 public: 438 enum Intel_specific_constants { 439 // Constants does not apply, since the lengths and offsets depends on the actual jump 440 // used 441 // Instruction codes: 442 // Unconditional jumps: 0xE9 (rel32off), 0xEB (rel8off) 443 // Conditional jumps: 0x0F8x (rel32off), 0x7x (rel8off) 444 unconditional_long_jump = 0xe9, 445 unconditional_short_jump = 0xeb, 446 instruction_size = 5 447 }; 448 449 address instruction_address() const { return addr_at(0); } 450 address jump_destination() const; 451 452 // Creation 453 inline friend NativeGeneralJump* nativeGeneralJump_at(address address); 454 455 // Insertion of native general jump instruction 456 static void insert_unconditional(address code_pos, address entry); 457 static void replace_mt_safe(address instr_addr, address code_buffer); 458 459 void verify(); 460 }; 461 462 inline NativeGeneralJump* nativeGeneralJump_at(address address) { 463 NativeGeneralJump* jump = (NativeGeneralJump*)(address); 464 debug_only(jump->verify();) 465 return jump; 466 } 467 468 class NativePopReg : public NativeInstruction { 469 public: 470 enum Intel_specific_constants { 471 instruction_code = 0x58, 472 instruction_size = 1, 473 instruction_offset = 0, 474 data_offset = 1, 475 next_instruction_offset = 1 476 }; 477 478 // Insert a pop instruction 479 static void insert(address code_pos, Register reg); 480 }; 481 482 483 class NativeIllegalInstruction: public NativeInstruction { 484 public: 485 enum Intel_specific_constants { 486 instruction_code = 0x0B0F, // Real byte order is: 0x0F, 0x0B 487 instruction_size = 2, 488 instruction_offset = 0, 489 next_instruction_offset = 2 490 }; 491 492 // Insert illegal opcode as specific address 493 static void insert(address code_pos); 494 }; 495 496 // return instruction that does not pop values of the stack 497 class NativeReturn: public NativeInstruction { 498 public: 499 enum Intel_specific_constants { 500 instruction_code = 0xC3, 501 instruction_size = 1, 502 instruction_offset = 0, 503 next_instruction_offset = 1 504 }; 505 }; 506 507 // return instruction that does pop values of the stack 508 class NativeReturnX: public NativeInstruction { 509 public: 510 enum Intel_specific_constants { 511 instruction_code = 0xC2, 512 instruction_size = 2, 513 instruction_offset = 0, 514 next_instruction_offset = 2 515 }; 516 }; 517 518 // Simple test vs memory 519 class NativeTstRegMem: public NativeInstruction { 520 public: 521 enum Intel_specific_constants { 522 instruction_rex_prefix_mask = 0xF0, 523 instruction_rex_prefix = Assembler::REX, 524 instruction_code_memXregl = 0x85, 525 modrm_mask = 0x38, // select reg from the ModRM byte 526 modrm_reg = 0x00 // rax 527 }; 528 }; 529 530 inline bool NativeInstruction::is_illegal() { return (short)int_at(0) == (short)NativeIllegalInstruction::instruction_code; } 531 inline bool NativeInstruction::is_call() { return ubyte_at(0) == NativeCall::instruction_code; } 532 inline bool NativeInstruction::is_return() { return ubyte_at(0) == NativeReturn::instruction_code || 533 ubyte_at(0) == NativeReturnX::instruction_code; } 534 inline bool NativeInstruction::is_jump() { return ubyte_at(0) == NativeJump::instruction_code || 535 ubyte_at(0) == 0xEB; /* short jump */ } 536 inline bool NativeInstruction::is_cond_jump() { return (int_at(0) & 0xF0FF) == 0x800F /* long jump */ || 537 (ubyte_at(0) & 0xF0) == 0x70; /* short jump */ } 538 inline bool NativeInstruction::is_safepoint_poll() { 539 #ifdef AMD64 540 if (Assembler::is_polling_page_far()) { 541 // two cases, depending on the choice of the base register in the address. 542 if (((ubyte_at(0) & NativeTstRegMem::instruction_rex_prefix_mask) == NativeTstRegMem::instruction_rex_prefix && 543 ubyte_at(1) == NativeTstRegMem::instruction_code_memXregl && 544 (ubyte_at(2) & NativeTstRegMem::modrm_mask) == NativeTstRegMem::modrm_reg) || 545 ubyte_at(0) == NativeTstRegMem::instruction_code_memXregl && 546 (ubyte_at(1) & NativeTstRegMem::modrm_mask) == NativeTstRegMem::modrm_reg) { 547 return true; 548 } else { 549 return false; 550 } 551 } else { 552 if (ubyte_at(0) == NativeTstRegMem::instruction_code_memXregl && 553 ubyte_at(1) == 0x05) { // 00 rax 101 554 address fault = addr_at(6) + int_at(2); 555 return os::is_poll_address(fault); 556 } else { 557 return false; 558 } 559 } 560 #else 561 return ( ubyte_at(0) == NativeMovRegMem::instruction_code_mem2reg || 562 ubyte_at(0) == NativeTstRegMem::instruction_code_memXregl ) && 563 (ubyte_at(1)&0xC7) == 0x05 && /* Mod R/M == disp32 */ 564 (os::is_poll_address((address)int_at(2))); 565 #endif // AMD64 566 } 567 568 inline bool NativeInstruction::is_mov_literal64() { 569 #ifdef AMD64 570 return ((ubyte_at(0) == Assembler::REX_W || ubyte_at(0) == Assembler::REX_WB) && 571 (ubyte_at(1) & (0xff ^ NativeMovConstReg::register_mask)) == 0xB8); 572 #else 573 return false; 574 #endif // AMD64 575 } 576 577 #endif // CPU_X86_VM_NATIVEINST_X86_HPP