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