1 //===------------- OrcABISupport.cpp - ABI specific support code ----------===// 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 #include "llvm/ExecutionEngine/Orc/OrcABISupport.h" 11 #include "llvm/ADT/Triple.h" 12 #include "llvm/Support/Process.h" 13 14 namespace llvm { 15 namespace orc { 16 17 void OrcAArch64::writeResolverCode(uint8_t *ResolverMem, JITReentryFn ReentryFn, 18 void *CallbackMgr) { 19 20 const uint32_t ResolverCode[] = { 21 // resolver_entry: 22 0xa9bf47fd, // 0x000: stp x29, x17, [sp, #-16]! 23 0x910003fd, // 0x004: mov x29, sp 24 0xa9bf73fb, // 0x008: stp x27, x28, [sp, #-16]! 25 0xa9bf6bf9, // 0x00c: stp x25, x26, [sp, #-16]! 26 0xa9bf63f7, // 0x010: stp x23, x24, [sp, #-16]! 27 0xa9bf5bf5, // 0x014: stp x21, x22, [sp, #-16]! 28 0xa9bf53f3, // 0x018: stp x19, x20, [sp, #-16]! 29 0xa9bf3fee, // 0x01c: stp x14, x15, [sp, #-16]! 30 0xa9bf37ec, // 0x020: stp x12, x13, [sp, #-16]! 31 0xa9bf2fea, // 0x024: stp x10, x11, [sp, #-16]! 32 0xa9bf27e8, // 0x028: stp x8, x9, [sp, #-16]! 33 0xa9bf1fe6, // 0x02c: stp x6, x7, [sp, #-16]! 34 0xa9bf17e4, // 0x030: stp x4, x5, [sp, #-16]! 35 0xa9bf0fe2, // 0x034: stp x2, x3, [sp, #-16]! 36 0xa9bf07e0, // 0x038: stp x0, x1, [sp, #-16]! 37 0xadbf7ffe, // 0x03c: stp q30, q31, [sp, #-32]! 38 0xadbf77fc, // 0x040: stp q28, q29, [sp, #-32]! 39 0xadbf6ffa, // 0x044: stp q26, q27, [sp, #-32]! 40 0xadbf67f8, // 0x048: stp q24, q25, [sp, #-32]! 41 0xadbf5ff6, // 0x04c: stp q22, q23, [sp, #-32]! 42 0xadbf57f4, // 0x050: stp q20, q21, [sp, #-32]! 43 0xadbf4ff2, // 0x054: stp q18, q19, [sp, #-32]! 44 0xadbf47f0, // 0x058: stp q16, q17, [sp, #-32]! 45 0xadbf3fee, // 0x05c: stp q14, q15, [sp, #-32]! 46 0xadbf37ec, // 0x060: stp q12, q13, [sp, #-32]! 47 0xadbf2fea, // 0x064: stp q10, q11, [sp, #-32]! 48 0xadbf27e8, // 0x068: stp q8, q9, [sp, #-32]! 49 0xadbf1fe6, // 0x06c: stp q6, q7, [sp, #-32]! 50 0xadbf17e4, // 0x070: stp q4, q5, [sp, #-32]! 51 0xadbf0fe2, // 0x074: stp q2, q3, [sp, #-32]! 52 0xadbf07e0, // 0x078: stp q0, q1, [sp, #-32]! 53 0x580004e0, // 0x07c: ldr x0, Lcallbackmgr 54 0xaa1e03e1, // 0x080: mov x1, x30 55 0xd1003021, // 0x084: sub x1, x1, #12 56 0x58000442, // 0x088: ldr x2, Lreentry_fn_ptr 57 0xd63f0040, // 0x08c: blr x2 58 0xaa0003f1, // 0x090: mov x17, x0 59 0xacc107e0, // 0x094: ldp q0, q1, [sp], #32 60 0xacc10fe2, // 0x098: ldp q2, q3, [sp], #32 61 0xacc117e4, // 0x09c: ldp q4, q5, [sp], #32 62 0xacc11fe6, // 0x0a0: ldp q6, q7, [sp], #32 63 0xacc127e8, // 0x0a4: ldp q8, q9, [sp], #32 64 0xacc12fea, // 0x0a8: ldp q10, q11, [sp], #32 65 0xacc137ec, // 0x0ac: ldp q12, q13, [sp], #32 66 0xacc13fee, // 0x0b0: ldp q14, q15, [sp], #32 67 0xacc147f0, // 0x0b4: ldp q16, q17, [sp], #32 68 0xacc14ff2, // 0x0b8: ldp q18, q19, [sp], #32 69 0xacc157f4, // 0x0bc: ldp q20, q21, [sp], #32 70 0xacc15ff6, // 0x0c0: ldp q22, q23, [sp], #32 71 0xacc167f8, // 0x0c4: ldp q24, q25, [sp], #32 72 0xacc16ffa, // 0x0c8: ldp q26, q27, [sp], #32 73 0xacc177fc, // 0x0cc: ldp q28, q29, [sp], #32 74 0xacc17ffe, // 0x0d0: ldp q30, q31, [sp], #32 75 0xa8c107e0, // 0x0d4: ldp x0, x1, [sp], #16 76 0xa8c10fe2, // 0x0d8: ldp x2, x3, [sp], #16 77 0xa8c117e4, // 0x0dc: ldp x4, x5, [sp], #16 78 0xa8c11fe6, // 0x0e0: ldp x6, x7, [sp], #16 79 0xa8c127e8, // 0x0e4: ldp x8, x9, [sp], #16 80 0xa8c12fea, // 0x0e8: ldp x10, x11, [sp], #16 81 0xa8c137ec, // 0x0ec: ldp x12, x13, [sp], #16 82 0xa8c13fee, // 0x0f0: ldp x14, x15, [sp], #16 83 0xa8c153f3, // 0x0f4: ldp x19, x20, [sp], #16 84 0xa8c15bf5, // 0x0f8: ldp x21, x22, [sp], #16 85 0xa8c163f7, // 0x0fc: ldp x23, x24, [sp], #16 86 0xa8c16bf9, // 0x100: ldp x25, x26, [sp], #16 87 0xa8c173fb, // 0x104: ldp x27, x28, [sp], #16 88 0xa8c17bfd, // 0x108: ldp x29, x30, [sp], #16 89 0xd65f0220, // 0x10c: ret x17 90 0x01234567, // 0x110: Lreentry_fn_ptr: 91 0xdeadbeef, // 0x114: .quad 0 92 0x98765432, // 0x118: Lcallbackmgr: 93 0xcafef00d // 0x11c: .quad 0 94 }; 95 96 const unsigned ReentryFnAddrOffset = 0x110; 97 const unsigned CallbackMgrAddrOffset = 0x118; 98 99 memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode)); 100 memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn)); 101 memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr, 102 sizeof(CallbackMgr)); 103 } 104 105 void OrcAArch64::writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr, 106 unsigned NumTrampolines) { 107 108 unsigned OffsetToPtr = alignTo(NumTrampolines * TrampolineSize, 8); 109 110 memcpy(TrampolineMem + OffsetToPtr, &ResolverAddr, sizeof(void *)); 111 112 // OffsetToPtr is actually the offset from the PC for the 2nd instruction, so 113 // subtract 32-bits. 114 OffsetToPtr -= 4; 115 116 uint32_t *Trampolines = reinterpret_cast<uint32_t *>(TrampolineMem); 117 118 for (unsigned I = 0; I < NumTrampolines; ++I, OffsetToPtr -= TrampolineSize) { 119 Trampolines[3 * I + 0] = 0xaa1e03f1; // mov x17, x30 120 Trampolines[3 * I + 1] = 0x58000010 | (OffsetToPtr << 3); // mov x16, Lptr 121 Trampolines[3 * I + 2] = 0xd63f0200; // blr x16 122 } 123 124 } 125 126 Error OrcAArch64::emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo, 127 unsigned MinStubs, 128 void *InitialPtrVal) { 129 // Stub format is: 130 // 131 // .section __orc_stubs 132 // stub1: 133 // ldr x0, ptr1 ; PC-rel load of ptr1 134 // br x0 ; Jump to resolver 135 // stub2: 136 // ldr x0, ptr2 ; PC-rel load of ptr2 137 // br x0 ; Jump to resolver 138 // 139 // ... 140 // 141 // .section __orc_ptrs 142 // ptr1: 143 // .quad 0x0 144 // ptr2: 145 // .quad 0x0 146 // 147 // ... 148 149 const unsigned StubSize = IndirectStubsInfo::StubSize; 150 151 // Emit at least MinStubs, rounded up to fill the pages allocated. 152 unsigned PageSize = sys::Process::getPageSize(); 153 unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize; 154 unsigned NumStubs = (NumPages * PageSize) / StubSize; 155 156 // Allocate memory for stubs and pointers in one call. 157 std::error_code EC; 158 auto StubsMem = sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory( 159 2 * NumPages * PageSize, nullptr, 160 sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC)); 161 162 if (EC) 163 return errorCodeToError(EC); 164 165 // Create separate MemoryBlocks representing the stubs and pointers. 166 sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize); 167 sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) + 168 NumPages * PageSize, 169 NumPages * PageSize); 170 171 // Populate the stubs page stubs and mark it executable. 172 uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base()); 173 uint64_t PtrOffsetField = static_cast<uint64_t>(NumPages * PageSize) 174 << 3; 175 176 for (unsigned I = 0; I < NumStubs; ++I) 177 Stub[I] = 0xd61f020058000010 | PtrOffsetField; 178 179 if (auto EC = sys::Memory::protectMappedMemory( 180 StubsBlock, sys::Memory::MF_READ | sys::Memory::MF_EXEC)) 181 return errorCodeToError(EC); 182 183 // Initialize all pointers to point at FailureAddress. 184 void **Ptr = reinterpret_cast<void **>(PtrsBlock.base()); 185 for (unsigned I = 0; I < NumStubs; ++I) 186 Ptr[I] = InitialPtrVal; 187 188 StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem)); 189 190 return Error::success(); 191 } 192 193 void OrcX86_64_Base::writeTrampolines(uint8_t *TrampolineMem, 194 void *ResolverAddr, 195 unsigned NumTrampolines) { 196 197 unsigned OffsetToPtr = NumTrampolines * TrampolineSize; 198 199 memcpy(TrampolineMem + OffsetToPtr, &ResolverAddr, sizeof(void *)); 200 201 uint64_t *Trampolines = reinterpret_cast<uint64_t *>(TrampolineMem); 202 uint64_t CallIndirPCRel = 0xf1c40000000015ff; 203 204 for (unsigned I = 0; I < NumTrampolines; ++I, OffsetToPtr -= TrampolineSize) 205 Trampolines[I] = CallIndirPCRel | ((OffsetToPtr - 6) << 16); 206 } 207 208 Error OrcX86_64_Base::emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo, 209 unsigned MinStubs, 210 void *InitialPtrVal) { 211 // Stub format is: 212 // 213 // .section __orc_stubs 214 // stub1: 215 // jmpq *ptr1(%rip) 216 // .byte 0xC4 ; <- Invalid opcode padding. 217 // .byte 0xF1 218 // stub2: 219 // jmpq *ptr2(%rip) 220 // 221 // ... 222 // 223 // .section __orc_ptrs 224 // ptr1: 225 // .quad 0x0 226 // ptr2: 227 // .quad 0x0 228 // 229 // ... 230 231 const unsigned StubSize = IndirectStubsInfo::StubSize; 232 233 // Emit at least MinStubs, rounded up to fill the pages allocated. 234 unsigned PageSize = sys::Process::getPageSize(); 235 unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize; 236 unsigned NumStubs = (NumPages * PageSize) / StubSize; 237 238 // Allocate memory for stubs and pointers in one call. 239 std::error_code EC; 240 auto StubsMem = sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory( 241 2 * NumPages * PageSize, nullptr, 242 sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC)); 243 244 if (EC) 245 return errorCodeToError(EC); 246 247 // Create separate MemoryBlocks representing the stubs and pointers. 248 sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize); 249 sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) + 250 NumPages * PageSize, 251 NumPages * PageSize); 252 253 // Populate the stubs page stubs and mark it executable. 254 uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base()); 255 uint64_t PtrOffsetField = static_cast<uint64_t>(NumPages * PageSize - 6) 256 << 16; 257 for (unsigned I = 0; I < NumStubs; ++I) 258 Stub[I] = 0xF1C40000000025ff | PtrOffsetField; 259 260 if (auto EC = sys::Memory::protectMappedMemory( 261 StubsBlock, sys::Memory::MF_READ | sys::Memory::MF_EXEC)) 262 return errorCodeToError(EC); 263 264 // Initialize all pointers to point at FailureAddress. 265 void **Ptr = reinterpret_cast<void **>(PtrsBlock.base()); 266 for (unsigned I = 0; I < NumStubs; ++I) 267 Ptr[I] = InitialPtrVal; 268 269 StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem)); 270 271 return Error::success(); 272 } 273 274 void OrcX86_64_SysV::writeResolverCode(uint8_t *ResolverMem, 275 JITReentryFn ReentryFn, 276 void *CallbackMgr) { 277 278 const uint8_t ResolverCode[] = { 279 // resolver_entry: 280 0x55, // 0x00: pushq %rbp 281 0x48, 0x89, 0xe5, // 0x01: movq %rsp, %rbp 282 0x50, // 0x04: pushq %rax 283 0x53, // 0x05: pushq %rbx 284 0x51, // 0x06: pushq %rcx 285 0x52, // 0x07: pushq %rdx 286 0x56, // 0x08: pushq %rsi 287 0x57, // 0x09: pushq %rdi 288 0x41, 0x50, // 0x0a: pushq %r8 289 0x41, 0x51, // 0x0c: pushq %r9 290 0x41, 0x52, // 0x0e: pushq %r10 291 0x41, 0x53, // 0x10: pushq %r11 292 0x41, 0x54, // 0x12: pushq %r12 293 0x41, 0x55, // 0x14: pushq %r13 294 0x41, 0x56, // 0x16: pushq %r14 295 0x41, 0x57, // 0x18: pushq %r15 296 0x48, 0x81, 0xec, 0x08, 0x02, 0x00, 0x00, // 0x1a: subq 0x208, %rsp 297 0x48, 0x0f, 0xae, 0x04, 0x24, // 0x21: fxsave64 (%rsp) 298 0x48, 0xbf, // 0x26: movabsq <CBMgr>, %rdi 299 300 // 0x28: Callback manager addr. 301 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 302 303 0x48, 0x8b, 0x75, 0x08, // 0x30: movq 8(%rbp), %rsi 304 0x48, 0x83, 0xee, 0x06, // 0x34: subq $6, %rsi 305 0x48, 0xb8, // 0x38: movabsq <REntry>, %rax 306 307 // 0x3a: JIT re-entry fn addr: 308 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 309 310 0xff, 0xd0, // 0x42: callq *%rax 311 0x48, 0x89, 0x45, 0x08, // 0x44: movq %rax, 8(%rbp) 312 0x48, 0x0f, 0xae, 0x0c, 0x24, // 0x48: fxrstor64 (%rsp) 313 0x48, 0x81, 0xc4, 0x08, 0x02, 0x00, 0x00, // 0x4d: addq 0x208, %rsp 314 0x41, 0x5f, // 0x54: popq %r15 315 0x41, 0x5e, // 0x56: popq %r14 316 0x41, 0x5d, // 0x58: popq %r13 317 0x41, 0x5c, // 0x5a: popq %r12 318 0x41, 0x5b, // 0x5c: popq %r11 319 0x41, 0x5a, // 0x5e: popq %r10 320 0x41, 0x59, // 0x60: popq %r9 321 0x41, 0x58, // 0x62: popq %r8 322 0x5f, // 0x64: popq %rdi 323 0x5e, // 0x65: popq %rsi 324 0x5a, // 0x66: popq %rdx 325 0x59, // 0x67: popq %rcx 326 0x5b, // 0x68: popq %rbx 327 0x58, // 0x69: popq %rax 328 0x5d, // 0x6a: popq %rbp 329 0xc3, // 0x6b: retq 330 }; 331 332 const unsigned ReentryFnAddrOffset = 0x3a; 333 const unsigned CallbackMgrAddrOffset = 0x28; 334 335 memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode)); 336 memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn)); 337 memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr, 338 sizeof(CallbackMgr)); 339 } 340 341 void OrcX86_64_Win32::writeResolverCode(uint8_t *ResolverMem, 342 JITReentryFn ReentryFn, 343 void *CallbackMgr) { 344 345 // resolverCode is similar to OrcX86_64 with differences specific to windows x64 calling convention: 346 // arguments go into rcx, rdx and come in reverse order, shadow space allocation on stack 347 const uint8_t ResolverCode[] = { 348 // resolver_entry: 349 0x55, // 0x00: pushq %rbp 350 0x48, 0x89, 0xe5, // 0x01: movq %rsp, %rbp 351 0x50, // 0x04: pushq %rax 352 0x53, // 0x05: pushq %rbx 353 0x51, // 0x06: pushq %rcx 354 0x52, // 0x07: pushq %rdx 355 0x56, // 0x08: pushq %rsi 356 0x57, // 0x09: pushq %rdi 357 0x41, 0x50, // 0x0a: pushq %r8 358 0x41, 0x51, // 0x0c: pushq %r9 359 0x41, 0x52, // 0x0e: pushq %r10 360 0x41, 0x53, // 0x10: pushq %r11 361 0x41, 0x54, // 0x12: pushq %r12 362 0x41, 0x55, // 0x14: pushq %r13 363 0x41, 0x56, // 0x16: pushq %r14 364 0x41, 0x57, // 0x18: pushq %r15 365 0x48, 0x81, 0xec, 0x08, 0x02, 0x00, 0x00, // 0x1a: subq 0x208, %rsp 366 0x48, 0x0f, 0xae, 0x04, 0x24, // 0x21: fxsave64 (%rsp) 367 368 0x48, 0xb9, // 0x26: movabsq <CBMgr>, %rcx 369 // 0x28: Callback manager addr. 370 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 371 372 0x48, 0x8B, 0x55, 0x08, // 0x30: mov rdx, [rbp+0x8] 373 0x48, 0x83, 0xea, 0x06, // 0x34: sub rdx, 0x6 374 375 0x48, 0xb8, // 0x38: movabsq <REntry>, %rax 376 // 0x3a: JIT re-entry fn addr: 377 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 378 379 // 0x42: sub rsp, 0x20 (Allocate shadow space) 380 0x48, 0x83, 0xEC, 0x20, 381 0xff, 0xd0, // 0x46: callq *%rax 382 383 // 0x48: add rsp, 0x20 (Free shadow space) 384 0x48, 0x83, 0xC4, 0x20, 385 386 0x48, 0x89, 0x45, 0x08, // 0x4C: movq %rax, 8(%rbp) 387 0x48, 0x0f, 0xae, 0x0c, 0x24, // 0x50: fxrstor64 (%rsp) 388 0x48, 0x81, 0xc4, 0x08, 0x02, 0x00, 0x00, // 0x55: addq 0x208, %rsp 389 0x41, 0x5f, // 0x5C: popq %r15 390 0x41, 0x5e, // 0x5E: popq %r14 391 0x41, 0x5d, // 0x60: popq %r13 392 0x41, 0x5c, // 0x62: popq %r12 393 0x41, 0x5b, // 0x64: popq %r11 394 0x41, 0x5a, // 0x66: popq %r10 395 0x41, 0x59, // 0x68: popq %r9 396 0x41, 0x58, // 0x6a: popq %r8 397 0x5f, // 0x6c: popq %rdi 398 0x5e, // 0x6d: popq %rsi 399 0x5a, // 0x6e: popq %rdx 400 0x59, // 0x6f: popq %rcx 401 0x5b, // 0x70: popq %rbx 402 0x58, // 0x71: popq %rax 403 0x5d, // 0x72: popq %rbp 404 0xc3, // 0x73: retq 405 }; 406 407 408 const unsigned ReentryFnAddrOffset = 0x3a; 409 const unsigned CallbackMgrAddrOffset = 0x28; 410 411 memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode)); 412 memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn)); 413 memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr, 414 sizeof(CallbackMgr)); 415 } 416 417 void OrcI386::writeResolverCode(uint8_t *ResolverMem, JITReentryFn ReentryFn, 418 void *CallbackMgr) { 419 420 const uint8_t ResolverCode[] = { 421 // resolver_entry: 422 0x55, // 0x00: pushl %ebp 423 0x89, 0xe5, // 0x01: movl %esp, %ebp 424 0x54, // 0x03: pushl %esp 425 0x83, 0xe4, 0xf0, // 0x04: andl $-0x10, %esp 426 0x50, // 0x07: pushl %eax 427 0x53, // 0x08: pushl %ebx 428 0x51, // 0x09: pushl %ecx 429 0x52, // 0x0a: pushl %edx 430 0x56, // 0x0b: pushl %esi 431 0x57, // 0x0c: pushl %edi 432 0x81, 0xec, 0x18, 0x02, 0x00, 0x00, // 0x0d: subl $0x218, %esp 433 0x0f, 0xae, 0x44, 0x24, 0x10, // 0x13: fxsave 0x10(%esp) 434 0x8b, 0x75, 0x04, // 0x18: movl 0x4(%ebp), %esi 435 0x83, 0xee, 0x05, // 0x1b: subl $0x5, %esi 436 0x89, 0x74, 0x24, 0x04, // 0x1e: movl %esi, 0x4(%esp) 437 0xc7, 0x04, 0x24, 0x00, 0x00, 0x00, 438 0x00, // 0x22: movl <cbmgr>, (%esp) 439 0xb8, 0x00, 0x00, 0x00, 0x00, // 0x29: movl <reentry>, %eax 440 0xff, 0xd0, // 0x2e: calll *%eax 441 0x89, 0x45, 0x04, // 0x30: movl %eax, 0x4(%ebp) 442 0x0f, 0xae, 0x4c, 0x24, 0x10, // 0x33: fxrstor 0x10(%esp) 443 0x81, 0xc4, 0x18, 0x02, 0x00, 0x00, // 0x38: addl $0x218, %esp 444 0x5f, // 0x3e: popl %edi 445 0x5e, // 0x3f: popl %esi 446 0x5a, // 0x40: popl %edx 447 0x59, // 0x41: popl %ecx 448 0x5b, // 0x42: popl %ebx 449 0x58, // 0x43: popl %eax 450 0x8b, 0x65, 0xfc, // 0x44: movl -0x4(%ebp), %esp 451 0x5d, // 0x48: popl %ebp 452 0xc3 // 0x49: retl 453 }; 454 455 const unsigned ReentryFnAddrOffset = 0x2a; 456 const unsigned CallbackMgrAddrOffset = 0x25; 457 458 memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode)); 459 memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn)); 460 memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr, 461 sizeof(CallbackMgr)); 462 } 463 464 void OrcI386::writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr, 465 unsigned NumTrampolines) { 466 467 uint64_t CallRelImm = 0xF1C4C400000000e8; 468 uint64_t Resolver = reinterpret_cast<uint64_t>(ResolverAddr); 469 uint64_t ResolverRel = 470 Resolver - reinterpret_cast<uint64_t>(TrampolineMem) - 5; 471 472 uint64_t *Trampolines = reinterpret_cast<uint64_t *>(TrampolineMem); 473 for (unsigned I = 0; I < NumTrampolines; ++I, ResolverRel -= TrampolineSize) 474 Trampolines[I] = CallRelImm | (ResolverRel << 8); 475 } 476 477 Error OrcI386::emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo, 478 unsigned MinStubs, void *InitialPtrVal) { 479 // Stub format is: 480 // 481 // .section __orc_stubs 482 // stub1: 483 // jmpq *ptr1 484 // .byte 0xC4 ; <- Invalid opcode padding. 485 // .byte 0xF1 486 // stub2: 487 // jmpq *ptr2 488 // 489 // ... 490 // 491 // .section __orc_ptrs 492 // ptr1: 493 // .quad 0x0 494 // ptr2: 495 // .quad 0x0 496 // 497 // ... 498 499 const unsigned StubSize = IndirectStubsInfo::StubSize; 500 501 // Emit at least MinStubs, rounded up to fill the pages allocated. 502 unsigned PageSize = sys::Process::getPageSize(); 503 unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize; 504 unsigned NumStubs = (NumPages * PageSize) / StubSize; 505 506 // Allocate memory for stubs and pointers in one call. 507 std::error_code EC; 508 auto StubsMem = sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory( 509 2 * NumPages * PageSize, nullptr, 510 sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC)); 511 512 if (EC) 513 return errorCodeToError(EC); 514 515 // Create separate MemoryBlocks representing the stubs and pointers. 516 sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize); 517 sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) + 518 NumPages * PageSize, 519 NumPages * PageSize); 520 521 // Populate the stubs page stubs and mark it executable. 522 uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base()); 523 uint64_t PtrAddr = reinterpret_cast<uint64_t>(PtrsBlock.base()); 524 for (unsigned I = 0; I < NumStubs; ++I, PtrAddr += 4) 525 Stub[I] = 0xF1C40000000025ff | (PtrAddr << 16); 526 527 if (auto EC = sys::Memory::protectMappedMemory( 528 StubsBlock, sys::Memory::MF_READ | sys::Memory::MF_EXEC)) 529 return errorCodeToError(EC); 530 531 // Initialize all pointers to point at FailureAddress. 532 void **Ptr = reinterpret_cast<void **>(PtrsBlock.base()); 533 for (unsigned I = 0; I < NumStubs; ++I) 534 Ptr[I] = InitialPtrVal; 535 536 StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem)); 537 538 return Error::success(); 539 } 540 541 } // End namespace orc. 542 } // End namespace llvm. 543
