1 //===-- X86JITInfo.cpp - Implement the JIT interfaces for the X86 target --===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the JIT interfaces for the X86 target. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #define DEBUG_TYPE "jit" 15 #include "X86JITInfo.h" 16 #include "X86Relocations.h" 17 #include "X86Subtarget.h" 18 #include "X86TargetMachine.h" 19 #include "llvm/IR/Function.h" 20 #include "llvm/Support/Compiler.h" 21 #include "llvm/Support/ErrorHandling.h" 22 #include "llvm/Support/Valgrind.h" 23 #include <cstdlib> 24 #include <cstring> 25 using namespace llvm; 26 27 // Determine the platform we're running on 28 #if defined (__x86_64__) || defined (_M_AMD64) || defined (_M_X64) 29 # define X86_64_JIT 30 #elif defined(__i386__) || defined(i386) || defined(_M_IX86) 31 # define X86_32_JIT 32 #endif 33 34 void X86JITInfo::replaceMachineCodeForFunction(void *Old, void *New) { 35 unsigned char *OldByte = (unsigned char *)Old; 36 *OldByte++ = 0xE9; // Emit JMP opcode. 37 unsigned *OldWord = (unsigned *)OldByte; 38 unsigned NewAddr = (intptr_t)New; 39 unsigned OldAddr = (intptr_t)OldWord; 40 *OldWord = NewAddr - OldAddr - 4; // Emit PC-relative addr of New code. 41 42 // X86 doesn't need to invalidate the processor cache, so just invalidate 43 // Valgrind's cache directly. 44 sys::ValgrindDiscardTranslations(Old, 5); 45 } 46 47 48 /// JITCompilerFunction - This contains the address of the JIT function used to 49 /// compile a function lazily. 50 static TargetJITInfo::JITCompilerFn JITCompilerFunction; 51 52 // Get the ASMPREFIX for the current host. This is often '_'. 53 #ifndef __USER_LABEL_PREFIX__ 54 #define __USER_LABEL_PREFIX__ 55 #endif 56 #define GETASMPREFIX2(X) #X 57 #define GETASMPREFIX(X) GETASMPREFIX2(X) 58 #define ASMPREFIX GETASMPREFIX(__USER_LABEL_PREFIX__) 59 60 // For ELF targets, use a .size and .type directive, to let tools 61 // know the extent of functions defined in assembler. 62 #if defined(__ELF__) 63 # define SIZE(sym) ".size " #sym ", . - " #sym "\n" 64 # define TYPE_FUNCTION(sym) ".type " #sym ", @function\n" 65 #else 66 # define SIZE(sym) 67 # define TYPE_FUNCTION(sym) 68 #endif 69 70 // Provide a convenient way for disabling usage of CFI directives. 71 // This is needed for old/broken assemblers (for example, gas on 72 // Darwin is pretty old and doesn't support these directives) 73 #if defined(__APPLE__) 74 # define CFI(x) 75 #else 76 // FIXME: Disable this until we really want to use it. Also, we will 77 // need to add some workarounds for compilers, which support 78 // only subset of these directives. 79 # define CFI(x) 80 #endif 81 82 // Provide a wrapper for LLVMX86CompilationCallback2 that saves non-traditional 83 // callee saved registers, for the fastcc calling convention. 84 extern "C" { 85 #if defined(X86_64_JIT) 86 # ifndef _MSC_VER 87 // No need to save EAX/EDX for X86-64. 88 void X86CompilationCallback(void); 89 asm( 90 ".text\n" 91 ".align 8\n" 92 ".globl " ASMPREFIX "X86CompilationCallback\n" 93 TYPE_FUNCTION(X86CompilationCallback) 94 ASMPREFIX "X86CompilationCallback:\n" 95 CFI(".cfi_startproc\n") 96 // Save RBP 97 "pushq %rbp\n" 98 CFI(".cfi_def_cfa_offset 16\n") 99 CFI(".cfi_offset %rbp, -16\n") 100 // Save RSP 101 "movq %rsp, %rbp\n" 102 CFI(".cfi_def_cfa_register %rbp\n") 103 // Save all int arg registers 104 "pushq %rdi\n" 105 CFI(".cfi_rel_offset %rdi, 0\n") 106 "pushq %rsi\n" 107 CFI(".cfi_rel_offset %rsi, 8\n") 108 "pushq %rdx\n" 109 CFI(".cfi_rel_offset %rdx, 16\n") 110 "pushq %rcx\n" 111 CFI(".cfi_rel_offset %rcx, 24\n") 112 "pushq %r8\n" 113 CFI(".cfi_rel_offset %r8, 32\n") 114 "pushq %r9\n" 115 CFI(".cfi_rel_offset %r9, 40\n") 116 // Align stack on 16-byte boundary. ESP might not be properly aligned 117 // (8 byte) if this is called from an indirect stub. 118 "andq $-16, %rsp\n" 119 // Save all XMM arg registers 120 "subq $128, %rsp\n" 121 "movaps %xmm0, (%rsp)\n" 122 "movaps %xmm1, 16(%rsp)\n" 123 "movaps %xmm2, 32(%rsp)\n" 124 "movaps %xmm3, 48(%rsp)\n" 125 "movaps %xmm4, 64(%rsp)\n" 126 "movaps %xmm5, 80(%rsp)\n" 127 "movaps %xmm6, 96(%rsp)\n" 128 "movaps %xmm7, 112(%rsp)\n" 129 // JIT callee 130 #ifdef _WIN64 131 "subq $32, %rsp\n" 132 "movq %rbp, %rcx\n" // Pass prev frame and return address 133 "movq 8(%rbp), %rdx\n" 134 "call " ASMPREFIX "LLVMX86CompilationCallback2\n" 135 "addq $32, %rsp\n" 136 #else 137 "movq %rbp, %rdi\n" // Pass prev frame and return address 138 "movq 8(%rbp), %rsi\n" 139 "call " ASMPREFIX "LLVMX86CompilationCallback2\n" 140 #endif 141 // Restore all XMM arg registers 142 "movaps 112(%rsp), %xmm7\n" 143 "movaps 96(%rsp), %xmm6\n" 144 "movaps 80(%rsp), %xmm5\n" 145 "movaps 64(%rsp), %xmm4\n" 146 "movaps 48(%rsp), %xmm3\n" 147 "movaps 32(%rsp), %xmm2\n" 148 "movaps 16(%rsp), %xmm1\n" 149 "movaps (%rsp), %xmm0\n" 150 // Restore RSP 151 "movq %rbp, %rsp\n" 152 CFI(".cfi_def_cfa_register %rsp\n") 153 // Restore all int arg registers 154 "subq $48, %rsp\n" 155 CFI(".cfi_adjust_cfa_offset 48\n") 156 "popq %r9\n" 157 CFI(".cfi_adjust_cfa_offset -8\n") 158 CFI(".cfi_restore %r9\n") 159 "popq %r8\n" 160 CFI(".cfi_adjust_cfa_offset -8\n") 161 CFI(".cfi_restore %r8\n") 162 "popq %rcx\n" 163 CFI(".cfi_adjust_cfa_offset -8\n") 164 CFI(".cfi_restore %rcx\n") 165 "popq %rdx\n" 166 CFI(".cfi_adjust_cfa_offset -8\n") 167 CFI(".cfi_restore %rdx\n") 168 "popq %rsi\n" 169 CFI(".cfi_adjust_cfa_offset -8\n") 170 CFI(".cfi_restore %rsi\n") 171 "popq %rdi\n" 172 CFI(".cfi_adjust_cfa_offset -8\n") 173 CFI(".cfi_restore %rdi\n") 174 // Restore RBP 175 "popq %rbp\n" 176 CFI(".cfi_adjust_cfa_offset -8\n") 177 CFI(".cfi_restore %rbp\n") 178 "ret\n" 179 CFI(".cfi_endproc\n") 180 SIZE(X86CompilationCallback) 181 ); 182 # else 183 // No inline assembler support on this platform. The routine is in external 184 // file. 185 void X86CompilationCallback(); 186 187 # endif 188 #elif defined (X86_32_JIT) 189 # ifndef _MSC_VER 190 void X86CompilationCallback(void); 191 asm( 192 ".text\n" 193 ".align 8\n" 194 ".globl " ASMPREFIX "X86CompilationCallback\n" 195 TYPE_FUNCTION(X86CompilationCallback) 196 ASMPREFIX "X86CompilationCallback:\n" 197 CFI(".cfi_startproc\n") 198 "pushl %ebp\n" 199 CFI(".cfi_def_cfa_offset 8\n") 200 CFI(".cfi_offset %ebp, -8\n") 201 "movl %esp, %ebp\n" // Standard prologue 202 CFI(".cfi_def_cfa_register %ebp\n") 203 "pushl %eax\n" 204 CFI(".cfi_rel_offset %eax, 0\n") 205 "pushl %edx\n" // Save EAX/EDX/ECX 206 CFI(".cfi_rel_offset %edx, 4\n") 207 "pushl %ecx\n" 208 CFI(".cfi_rel_offset %ecx, 8\n") 209 # if defined(__APPLE__) 210 "andl $-16, %esp\n" // Align ESP on 16-byte boundary 211 # endif 212 "subl $16, %esp\n" 213 "movl 4(%ebp), %eax\n" // Pass prev frame and return address 214 "movl %eax, 4(%esp)\n" 215 "movl %ebp, (%esp)\n" 216 "call " ASMPREFIX "LLVMX86CompilationCallback2\n" 217 "movl %ebp, %esp\n" // Restore ESP 218 CFI(".cfi_def_cfa_register %esp\n") 219 "subl $12, %esp\n" 220 CFI(".cfi_adjust_cfa_offset 12\n") 221 "popl %ecx\n" 222 CFI(".cfi_adjust_cfa_offset -4\n") 223 CFI(".cfi_restore %ecx\n") 224 "popl %edx\n" 225 CFI(".cfi_adjust_cfa_offset -4\n") 226 CFI(".cfi_restore %edx\n") 227 "popl %eax\n" 228 CFI(".cfi_adjust_cfa_offset -4\n") 229 CFI(".cfi_restore %eax\n") 230 "popl %ebp\n" 231 CFI(".cfi_adjust_cfa_offset -4\n") 232 CFI(".cfi_restore %ebp\n") 233 "ret\n" 234 CFI(".cfi_endproc\n") 235 SIZE(X86CompilationCallback) 236 ); 237 238 // Same as X86CompilationCallback but also saves XMM argument registers. 239 void X86CompilationCallback_SSE(void); 240 asm( 241 ".text\n" 242 ".align 8\n" 243 ".globl " ASMPREFIX "X86CompilationCallback_SSE\n" 244 TYPE_FUNCTION(X86CompilationCallback_SSE) 245 ASMPREFIX "X86CompilationCallback_SSE:\n" 246 CFI(".cfi_startproc\n") 247 "pushl %ebp\n" 248 CFI(".cfi_def_cfa_offset 8\n") 249 CFI(".cfi_offset %ebp, -8\n") 250 "movl %esp, %ebp\n" // Standard prologue 251 CFI(".cfi_def_cfa_register %ebp\n") 252 "pushl %eax\n" 253 CFI(".cfi_rel_offset %eax, 0\n") 254 "pushl %edx\n" // Save EAX/EDX/ECX 255 CFI(".cfi_rel_offset %edx, 4\n") 256 "pushl %ecx\n" 257 CFI(".cfi_rel_offset %ecx, 8\n") 258 "andl $-16, %esp\n" // Align ESP on 16-byte boundary 259 // Save all XMM arg registers 260 "subl $64, %esp\n" 261 // FIXME: provide frame move information for xmm registers. 262 // This can be tricky, because CFA register is ebp (unaligned) 263 // and we need to produce offsets relative to it. 264 "movaps %xmm0, (%esp)\n" 265 "movaps %xmm1, 16(%esp)\n" 266 "movaps %xmm2, 32(%esp)\n" 267 "movaps %xmm3, 48(%esp)\n" 268 "subl $16, %esp\n" 269 "movl 4(%ebp), %eax\n" // Pass prev frame and return address 270 "movl %eax, 4(%esp)\n" 271 "movl %ebp, (%esp)\n" 272 "call " ASMPREFIX "LLVMX86CompilationCallback2\n" 273 "addl $16, %esp\n" 274 "movaps 48(%esp), %xmm3\n" 275 CFI(".cfi_restore %xmm3\n") 276 "movaps 32(%esp), %xmm2\n" 277 CFI(".cfi_restore %xmm2\n") 278 "movaps 16(%esp), %xmm1\n" 279 CFI(".cfi_restore %xmm1\n") 280 "movaps (%esp), %xmm0\n" 281 CFI(".cfi_restore %xmm0\n") 282 "movl %ebp, %esp\n" // Restore ESP 283 CFI(".cfi_def_cfa_register esp\n") 284 "subl $12, %esp\n" 285 CFI(".cfi_adjust_cfa_offset 12\n") 286 "popl %ecx\n" 287 CFI(".cfi_adjust_cfa_offset -4\n") 288 CFI(".cfi_restore %ecx\n") 289 "popl %edx\n" 290 CFI(".cfi_adjust_cfa_offset -4\n") 291 CFI(".cfi_restore %edx\n") 292 "popl %eax\n" 293 CFI(".cfi_adjust_cfa_offset -4\n") 294 CFI(".cfi_restore %eax\n") 295 "popl %ebp\n" 296 CFI(".cfi_adjust_cfa_offset -4\n") 297 CFI(".cfi_restore %ebp\n") 298 "ret\n" 299 CFI(".cfi_endproc\n") 300 SIZE(X86CompilationCallback_SSE) 301 ); 302 # else 303 void LLVMX86CompilationCallback2(intptr_t *StackPtr, intptr_t RetAddr); 304 305 _declspec(naked) void X86CompilationCallback(void) { 306 __asm { 307 push ebp 308 mov ebp, esp 309 push eax 310 push edx 311 push ecx 312 and esp, -16 313 sub esp, 16 314 mov eax, dword ptr [ebp+4] 315 mov dword ptr [esp+4], eax 316 mov dword ptr [esp], ebp 317 call LLVMX86CompilationCallback2 318 mov esp, ebp 319 sub esp, 12 320 pop ecx 321 pop edx 322 pop eax 323 pop ebp 324 ret 325 } 326 } 327 328 # endif // _MSC_VER 329 330 #else // Not an i386 host 331 void X86CompilationCallback() { 332 llvm_unreachable("Cannot call X86CompilationCallback() on a non-x86 arch!"); 333 } 334 #endif 335 } 336 337 /// This is the target-specific function invoked by the 338 /// function stub when we did not know the real target of a call. This function 339 /// must locate the start of the stub or call site and pass it into the JIT 340 /// compiler function. 341 extern "C" { 342 LLVM_ATTRIBUTE_USED // Referenced from inline asm. 343 LLVM_LIBRARY_VISIBILITY void LLVMX86CompilationCallback2(intptr_t *StackPtr, 344 intptr_t RetAddr) { 345 intptr_t *RetAddrLoc = &StackPtr[1]; 346 // We are reading raw stack data here. Tell MemorySanitizer that it is 347 // sufficiently initialized. 348 __msan_unpoison(RetAddrLoc, sizeof(*RetAddrLoc)); 349 assert(*RetAddrLoc == RetAddr && 350 "Could not find return address on the stack!"); 351 352 // It's a stub if there is an interrupt marker after the call. 353 bool isStub = ((unsigned char*)RetAddr)[0] == 0xCE; 354 355 // The call instruction should have pushed the return value onto the stack... 356 #if defined (X86_64_JIT) 357 RetAddr--; // Backtrack to the reference itself... 358 #else 359 RetAddr -= 4; // Backtrack to the reference itself... 360 #endif 361 362 #if 0 363 DEBUG(dbgs() << "In callback! Addr=" << (void*)RetAddr 364 << " ESP=" << (void*)StackPtr 365 << ": Resolving call to function: " 366 << TheVM->getFunctionReferencedName((void*)RetAddr) << "\n"); 367 #endif 368 369 // Sanity check to make sure this really is a call instruction. 370 #if defined (X86_64_JIT) 371 assert(((unsigned char*)RetAddr)[-2] == 0x41 &&"Not a call instr!"); 372 assert(((unsigned char*)RetAddr)[-1] == 0xFF &&"Not a call instr!"); 373 #else 374 assert(((unsigned char*)RetAddr)[-1] == 0xE8 &&"Not a call instr!"); 375 #endif 376 377 intptr_t NewVal = (intptr_t)JITCompilerFunction((void*)RetAddr); 378 379 // Rewrite the call target... so that we don't end up here every time we 380 // execute the call. 381 #if defined (X86_64_JIT) 382 assert(isStub && 383 "X86-64 doesn't support rewriting non-stub lazy compilation calls:" 384 " the call instruction varies too much."); 385 #else 386 *(intptr_t *)RetAddr = (intptr_t)(NewVal-RetAddr-4); 387 #endif 388 389 if (isStub) { 390 // If this is a stub, rewrite the call into an unconditional branch 391 // instruction so that two return addresses are not pushed onto the stack 392 // when the requested function finally gets called. This also makes the 393 // 0xCE byte (interrupt) dead, so the marker doesn't effect anything. 394 #if defined (X86_64_JIT) 395 // If the target address is within 32-bit range of the stub, use a 396 // PC-relative branch instead of loading the actual address. (This is 397 // considerably shorter than the 64-bit immediate load already there.) 398 // We assume here intptr_t is 64 bits. 399 intptr_t diff = NewVal-RetAddr+7; 400 if (diff >= -2147483648LL && diff <= 2147483647LL) { 401 *(unsigned char*)(RetAddr-0xc) = 0xE9; 402 *(intptr_t *)(RetAddr-0xb) = diff & 0xffffffff; 403 } else { 404 *(intptr_t *)(RetAddr - 0xa) = NewVal; 405 ((unsigned char*)RetAddr)[0] = (2 | (4 << 3) | (3 << 6)); 406 } 407 sys::ValgrindDiscardTranslations((void*)(RetAddr-0xc), 0xd); 408 #else 409 ((unsigned char*)RetAddr)[-1] = 0xE9; 410 sys::ValgrindDiscardTranslations((void*)(RetAddr-1), 5); 411 #endif 412 } 413 414 // Change the return address to reexecute the call instruction... 415 #if defined (X86_64_JIT) 416 *RetAddrLoc -= 0xd; 417 #else 418 *RetAddrLoc -= 5; 419 #endif 420 } 421 } 422 423 TargetJITInfo::LazyResolverFn 424 X86JITInfo::getLazyResolverFunction(JITCompilerFn F) { 425 TsanIgnoreWritesBegin(); 426 JITCompilerFunction = F; 427 TsanIgnoreWritesEnd(); 428 429 #if defined (X86_32_JIT) && !defined (_MSC_VER) 430 if (Subtarget->hasSSE1()) 431 return X86CompilationCallback_SSE; 432 #endif 433 434 return X86CompilationCallback; 435 } 436 437 X86JITInfo::X86JITInfo(X86TargetMachine &tm) : TM(tm) { 438 Subtarget = &TM.getSubtarget<X86Subtarget>(); 439 useGOT = 0; 440 TLSOffset = 0; 441 } 442 443 void *X86JITInfo::emitGlobalValueIndirectSym(const GlobalValue* GV, void *ptr, 444 JITCodeEmitter &JCE) { 445 #if defined (X86_64_JIT) 446 const unsigned Alignment = 8; 447 uint8_t Buffer[8]; 448 uint8_t *Cur = Buffer; 449 MachineCodeEmitter::emitWordLEInto(Cur, (unsigned)(intptr_t)ptr); 450 MachineCodeEmitter::emitWordLEInto(Cur, (unsigned)(((intptr_t)ptr) >> 32)); 451 #else 452 const unsigned Alignment = 4; 453 uint8_t Buffer[4]; 454 uint8_t *Cur = Buffer; 455 MachineCodeEmitter::emitWordLEInto(Cur, (intptr_t)ptr); 456 #endif 457 return JCE.allocIndirectGV(GV, Buffer, sizeof(Buffer), Alignment); 458 } 459 460 TargetJITInfo::StubLayout X86JITInfo::getStubLayout() { 461 // The 64-bit stub contains: 462 // movabs r10 <- 8-byte-target-address # 10 bytes 463 // call|jmp *r10 # 3 bytes 464 // The 32-bit stub contains a 5-byte call|jmp. 465 // If the stub is a call to the compilation callback, an extra byte is added 466 // to mark it as a stub. 467 StubLayout Result = {14, 4}; 468 return Result; 469 } 470 471 void *X86JITInfo::emitFunctionStub(const Function* F, void *Target, 472 JITCodeEmitter &JCE) { 473 // Note, we cast to intptr_t here to silence a -pedantic warning that 474 // complains about casting a function pointer to a normal pointer. 475 #if defined (X86_32_JIT) && !defined (_MSC_VER) 476 bool NotCC = (Target != (void*)(intptr_t)X86CompilationCallback && 477 Target != (void*)(intptr_t)X86CompilationCallback_SSE); 478 #else 479 bool NotCC = Target != (void*)(intptr_t)X86CompilationCallback; 480 #endif 481 JCE.emitAlignment(4); 482 void *Result = (void*)JCE.getCurrentPCValue(); 483 if (NotCC) { 484 #if defined (X86_64_JIT) 485 JCE.emitByte(0x49); // REX prefix 486 JCE.emitByte(0xB8+2); // movabsq r10 487 JCE.emitWordLE((unsigned)(intptr_t)Target); 488 JCE.emitWordLE((unsigned)(((intptr_t)Target) >> 32)); 489 JCE.emitByte(0x41); // REX prefix 490 JCE.emitByte(0xFF); // jmpq *r10 491 JCE.emitByte(2 | (4 << 3) | (3 << 6)); 492 #else 493 JCE.emitByte(0xE9); 494 JCE.emitWordLE((intptr_t)Target-JCE.getCurrentPCValue()-4); 495 #endif 496 return Result; 497 } 498 499 #if defined (X86_64_JIT) 500 JCE.emitByte(0x49); // REX prefix 501 JCE.emitByte(0xB8+2); // movabsq r10 502 JCE.emitWordLE((unsigned)(intptr_t)Target); 503 JCE.emitWordLE((unsigned)(((intptr_t)Target) >> 32)); 504 JCE.emitByte(0x41); // REX prefix 505 JCE.emitByte(0xFF); // callq *r10 506 JCE.emitByte(2 | (2 << 3) | (3 << 6)); 507 #else 508 JCE.emitByte(0xE8); // Call with 32 bit pc-rel destination... 509 510 JCE.emitWordLE((intptr_t)Target-JCE.getCurrentPCValue()-4); 511 #endif 512 513 // This used to use 0xCD, but that value is used by JITMemoryManager to 514 // initialize the buffer with garbage, which means it may follow a 515 // noreturn function call, confusing LLVMX86CompilationCallback2. PR 4929. 516 JCE.emitByte(0xCE); // Interrupt - Just a marker identifying the stub! 517 return Result; 518 } 519 520 /// getPICJumpTableEntry - Returns the value of the jumptable entry for the 521 /// specific basic block. 522 uintptr_t X86JITInfo::getPICJumpTableEntry(uintptr_t BB, uintptr_t Entry) { 523 #if defined(X86_64_JIT) 524 return BB - Entry; 525 #else 526 return BB - PICBase; 527 #endif 528 } 529 530 template<typename T> static void addUnaligned(void *Pos, T Delta) { 531 T Value; 532 std::memcpy(reinterpret_cast<char*>(&Value), reinterpret_cast<char*>(Pos), 533 sizeof(T)); 534 Value += Delta; 535 std::memcpy(reinterpret_cast<char*>(Pos), reinterpret_cast<char*>(&Value), 536 sizeof(T)); 537 } 538 539 /// relocate - Before the JIT can run a block of code that has been emitted, 540 /// it must rewrite the code to contain the actual addresses of any 541 /// referenced global symbols. 542 void X86JITInfo::relocate(void *Function, MachineRelocation *MR, 543 unsigned NumRelocs, unsigned char* GOTBase) { 544 for (unsigned i = 0; i != NumRelocs; ++i, ++MR) { 545 void *RelocPos = (char*)Function + MR->getMachineCodeOffset(); 546 intptr_t ResultPtr = (intptr_t)MR->getResultPointer(); 547 switch ((X86::RelocationType)MR->getRelocationType()) { 548 case X86::reloc_pcrel_word: { 549 // PC relative relocation, add the relocated value to the value already in 550 // memory, after we adjust it for where the PC is. 551 ResultPtr = ResultPtr -(intptr_t)RelocPos - 4 - MR->getConstantVal(); 552 addUnaligned<unsigned>(RelocPos, ResultPtr); 553 break; 554 } 555 case X86::reloc_picrel_word: { 556 // PIC base relative relocation, add the relocated value to the value 557 // already in memory, after we adjust it for where the PIC base is. 558 ResultPtr = ResultPtr - ((intptr_t)Function + MR->getConstantVal()); 559 addUnaligned<unsigned>(RelocPos, ResultPtr); 560 break; 561 } 562 case X86::reloc_absolute_word: 563 case X86::reloc_absolute_word_sext: 564 // Absolute relocation, just add the relocated value to the value already 565 // in memory. 566 addUnaligned<unsigned>(RelocPos, ResultPtr); 567 break; 568 case X86::reloc_absolute_dword: 569 addUnaligned<intptr_t>(RelocPos, ResultPtr); 570 break; 571 } 572 } 573 } 574 575 char* X86JITInfo::allocateThreadLocalMemory(size_t size) { 576 #if defined(X86_32_JIT) && !defined(__APPLE__) && !defined(_MSC_VER) 577 TLSOffset -= size; 578 return TLSOffset; 579 #else 580 llvm_unreachable("Cannot allocate thread local storage on this arch!"); 581 #endif 582 } 583