| //===------------- OrcABISupport.cpp - ABI specific support code ----------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/ExecutionEngine/Orc/OrcABISupport.h" |
| #include "llvm/ADT/Triple.h" |
| #include "llvm/Support/Process.h" |
| |
| namespace llvm { |
| namespace orc { |
| |
| void OrcAArch64::writeResolverCode(uint8_t *ResolverMem, JITReentryFn ReentryFn, |
| void *CallbackMgr) { |
| |
| const uint32_t ResolverCode[] = { |
| // resolver_entry: |
| 0xa9bf47fd, // 0x000: stp x29, x17, [sp, #-16]! |
| 0x910003fd, // 0x004: mov x29, sp |
| 0xa9bf73fb, // 0x008: stp x27, x28, [sp, #-16]! |
| 0xa9bf6bf9, // 0x00c: stp x25, x26, [sp, #-16]! |
| 0xa9bf63f7, // 0x010: stp x23, x24, [sp, #-16]! |
| 0xa9bf5bf5, // 0x014: stp x21, x22, [sp, #-16]! |
| 0xa9bf53f3, // 0x018: stp x19, x20, [sp, #-16]! |
| 0xa9bf3fee, // 0x01c: stp x14, x15, [sp, #-16]! |
| 0xa9bf37ec, // 0x020: stp x12, x13, [sp, #-16]! |
| 0xa9bf2fea, // 0x024: stp x10, x11, [sp, #-16]! |
| 0xa9bf27e8, // 0x028: stp x8, x9, [sp, #-16]! |
| 0xa9bf1fe6, // 0x02c: stp x6, x7, [sp, #-16]! |
| 0xa9bf17e4, // 0x030: stp x4, x5, [sp, #-16]! |
| 0xa9bf0fe2, // 0x034: stp x2, x3, [sp, #-16]! |
| 0xa9bf07e0, // 0x038: stp x0, x1, [sp, #-16]! |
| 0xadbf7ffe, // 0x03c: stp q30, q31, [sp, #-32]! |
| 0xadbf77fc, // 0x040: stp q28, q29, [sp, #-32]! |
| 0xadbf6ffa, // 0x044: stp q26, q27, [sp, #-32]! |
| 0xadbf67f8, // 0x048: stp q24, q25, [sp, #-32]! |
| 0xadbf5ff6, // 0x04c: stp q22, q23, [sp, #-32]! |
| 0xadbf57f4, // 0x050: stp q20, q21, [sp, #-32]! |
| 0xadbf4ff2, // 0x054: stp q18, q19, [sp, #-32]! |
| 0xadbf47f0, // 0x058: stp q16, q17, [sp, #-32]! |
| 0xadbf3fee, // 0x05c: stp q14, q15, [sp, #-32]! |
| 0xadbf37ec, // 0x060: stp q12, q13, [sp, #-32]! |
| 0xadbf2fea, // 0x064: stp q10, q11, [sp, #-32]! |
| 0xadbf27e8, // 0x068: stp q8, q9, [sp, #-32]! |
| 0xadbf1fe6, // 0x06c: stp q6, q7, [sp, #-32]! |
| 0xadbf17e4, // 0x070: stp q4, q5, [sp, #-32]! |
| 0xadbf0fe2, // 0x074: stp q2, q3, [sp, #-32]! |
| 0xadbf07e0, // 0x078: stp q0, q1, [sp, #-32]! |
| 0x580004e0, // 0x07c: ldr x0, Lcallbackmgr |
| 0xaa1e03e1, // 0x080: mov x1, x30 |
| 0xd1003021, // 0x084: sub x1, x1, #12 |
| 0x58000442, // 0x088: ldr x2, Lreentry_fn_ptr |
| 0xd63f0040, // 0x08c: blr x2 |
| 0xaa0003f1, // 0x090: mov x17, x0 |
| 0xacc107e0, // 0x094: ldp q0, q1, [sp], #32 |
| 0xacc10fe2, // 0x098: ldp q2, q3, [sp], #32 |
| 0xacc117e4, // 0x09c: ldp q4, q5, [sp], #32 |
| 0xacc11fe6, // 0x0a0: ldp q6, q7, [sp], #32 |
| 0xacc127e8, // 0x0a4: ldp q8, q9, [sp], #32 |
| 0xacc12fea, // 0x0a8: ldp q10, q11, [sp], #32 |
| 0xacc137ec, // 0x0ac: ldp q12, q13, [sp], #32 |
| 0xacc13fee, // 0x0b0: ldp q14, q15, [sp], #32 |
| 0xacc147f0, // 0x0b4: ldp q16, q17, [sp], #32 |
| 0xacc14ff2, // 0x0b8: ldp q18, q19, [sp], #32 |
| 0xacc157f4, // 0x0bc: ldp q20, q21, [sp], #32 |
| 0xacc15ff6, // 0x0c0: ldp q22, q23, [sp], #32 |
| 0xacc167f8, // 0x0c4: ldp q24, q25, [sp], #32 |
| 0xacc16ffa, // 0x0c8: ldp q26, q27, [sp], #32 |
| 0xacc177fc, // 0x0cc: ldp q28, q29, [sp], #32 |
| 0xacc17ffe, // 0x0d0: ldp q30, q31, [sp], #32 |
| 0xa8c107e0, // 0x0d4: ldp x0, x1, [sp], #16 |
| 0xa8c10fe2, // 0x0d8: ldp x2, x3, [sp], #16 |
| 0xa8c117e4, // 0x0dc: ldp x4, x5, [sp], #16 |
| 0xa8c11fe6, // 0x0e0: ldp x6, x7, [sp], #16 |
| 0xa8c127e8, // 0x0e4: ldp x8, x9, [sp], #16 |
| 0xa8c12fea, // 0x0e8: ldp x10, x11, [sp], #16 |
| 0xa8c137ec, // 0x0ec: ldp x12, x13, [sp], #16 |
| 0xa8c13fee, // 0x0f0: ldp x14, x15, [sp], #16 |
| 0xa8c153f3, // 0x0f4: ldp x19, x20, [sp], #16 |
| 0xa8c15bf5, // 0x0f8: ldp x21, x22, [sp], #16 |
| 0xa8c163f7, // 0x0fc: ldp x23, x24, [sp], #16 |
| 0xa8c16bf9, // 0x100: ldp x25, x26, [sp], #16 |
| 0xa8c173fb, // 0x104: ldp x27, x28, [sp], #16 |
| 0xa8c17bfd, // 0x108: ldp x29, x30, [sp], #16 |
| 0xd65f0220, // 0x10c: ret x17 |
| 0x01234567, // 0x110: Lreentry_fn_ptr: |
| 0xdeadbeef, // 0x114: .quad 0 |
| 0x98765432, // 0x118: Lcallbackmgr: |
| 0xcafef00d // 0x11c: .quad 0 |
| }; |
| |
| const unsigned ReentryFnAddrOffset = 0x110; |
| const unsigned CallbackMgrAddrOffset = 0x118; |
| |
| memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode)); |
| memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn)); |
| memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr, |
| sizeof(CallbackMgr)); |
| } |
| |
| void OrcAArch64::writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr, |
| unsigned NumTrampolines) { |
| |
| unsigned OffsetToPtr = alignTo(NumTrampolines * TrampolineSize, 8); |
| |
| memcpy(TrampolineMem + OffsetToPtr, &ResolverAddr, sizeof(void *)); |
| |
| // OffsetToPtr is actually the offset from the PC for the 2nd instruction, so |
| // subtract 32-bits. |
| OffsetToPtr -= 4; |
| |
| uint32_t *Trampolines = reinterpret_cast<uint32_t *>(TrampolineMem); |
| |
| for (unsigned I = 0; I < NumTrampolines; ++I, OffsetToPtr -= TrampolineSize) { |
| Trampolines[3 * I + 0] = 0xaa1e03f1; // mov x17, x30 |
| Trampolines[3 * I + 1] = 0x58000010 | (OffsetToPtr << 3); // adr x16, Lptr |
| Trampolines[3 * I + 2] = 0xd63f0200; // blr x16 |
| } |
| |
| } |
| |
| Error OrcAArch64::emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo, |
| unsigned MinStubs, |
| void *InitialPtrVal) { |
| // Stub format is: |
| // |
| // .section __orc_stubs |
| // stub1: |
| // ldr x0, ptr1 ; PC-rel load of ptr1 |
| // br x0 ; Jump to resolver |
| // stub2: |
| // ldr x0, ptr2 ; PC-rel load of ptr2 |
| // br x0 ; Jump to resolver |
| // |
| // ... |
| // |
| // .section __orc_ptrs |
| // ptr1: |
| // .quad 0x0 |
| // ptr2: |
| // .quad 0x0 |
| // |
| // ... |
| |
| const unsigned StubSize = IndirectStubsInfo::StubSize; |
| |
| // Emit at least MinStubs, rounded up to fill the pages allocated. |
| unsigned PageSize = sys::Process::getPageSize(); |
| unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize; |
| unsigned NumStubs = (NumPages * PageSize) / StubSize; |
| |
| // Allocate memory for stubs and pointers in one call. |
| std::error_code EC; |
| auto StubsMem = sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory( |
| 2 * NumPages * PageSize, nullptr, |
| sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC)); |
| |
| if (EC) |
| return errorCodeToError(EC); |
| |
| // Create separate MemoryBlocks representing the stubs and pointers. |
| sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize); |
| sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) + |
| NumPages * PageSize, |
| NumPages * PageSize); |
| |
| // Populate the stubs page stubs and mark it executable. |
| uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base()); |
| uint64_t PtrOffsetField = static_cast<uint64_t>(NumPages * PageSize) |
| << 3; |
| |
| for (unsigned I = 0; I < NumStubs; ++I) |
| Stub[I] = 0xd61f020058000010 | PtrOffsetField; |
| |
| if (auto EC = sys::Memory::protectMappedMemory( |
| StubsBlock, sys::Memory::MF_READ | sys::Memory::MF_EXEC)) |
| return errorCodeToError(EC); |
| |
| // Initialize all pointers to point at FailureAddress. |
| void **Ptr = reinterpret_cast<void **>(PtrsBlock.base()); |
| for (unsigned I = 0; I < NumStubs; ++I) |
| Ptr[I] = InitialPtrVal; |
| |
| StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem)); |
| |
| return Error::success(); |
| } |
| |
| void OrcX86_64_Base::writeTrampolines(uint8_t *TrampolineMem, |
| void *ResolverAddr, |
| unsigned NumTrampolines) { |
| |
| unsigned OffsetToPtr = NumTrampolines * TrampolineSize; |
| |
| memcpy(TrampolineMem + OffsetToPtr, &ResolverAddr, sizeof(void *)); |
| |
| uint64_t *Trampolines = reinterpret_cast<uint64_t *>(TrampolineMem); |
| uint64_t CallIndirPCRel = 0xf1c40000000015ff; |
| |
| for (unsigned I = 0; I < NumTrampolines; ++I, OffsetToPtr -= TrampolineSize) |
| Trampolines[I] = CallIndirPCRel | ((OffsetToPtr - 6) << 16); |
| } |
| |
| Error OrcX86_64_Base::emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo, |
| unsigned MinStubs, |
| void *InitialPtrVal) { |
| // Stub format is: |
| // |
| // .section __orc_stubs |
| // stub1: |
| // jmpq *ptr1(%rip) |
| // .byte 0xC4 ; <- Invalid opcode padding. |
| // .byte 0xF1 |
| // stub2: |
| // jmpq *ptr2(%rip) |
| // |
| // ... |
| // |
| // .section __orc_ptrs |
| // ptr1: |
| // .quad 0x0 |
| // ptr2: |
| // .quad 0x0 |
| // |
| // ... |
| |
| const unsigned StubSize = IndirectStubsInfo::StubSize; |
| |
| // Emit at least MinStubs, rounded up to fill the pages allocated. |
| unsigned PageSize = sys::Process::getPageSize(); |
| unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize; |
| unsigned NumStubs = (NumPages * PageSize) / StubSize; |
| |
| // Allocate memory for stubs and pointers in one call. |
| std::error_code EC; |
| auto StubsMem = sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory( |
| 2 * NumPages * PageSize, nullptr, |
| sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC)); |
| |
| if (EC) |
| return errorCodeToError(EC); |
| |
| // Create separate MemoryBlocks representing the stubs and pointers. |
| sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize); |
| sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) + |
| NumPages * PageSize, |
| NumPages * PageSize); |
| |
| // Populate the stubs page stubs and mark it executable. |
| uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base()); |
| uint64_t PtrOffsetField = static_cast<uint64_t>(NumPages * PageSize - 6) |
| << 16; |
| for (unsigned I = 0; I < NumStubs; ++I) |
| Stub[I] = 0xF1C40000000025ff | PtrOffsetField; |
| |
| if (auto EC = sys::Memory::protectMappedMemory( |
| StubsBlock, sys::Memory::MF_READ | sys::Memory::MF_EXEC)) |
| return errorCodeToError(EC); |
| |
| // Initialize all pointers to point at FailureAddress. |
| void **Ptr = reinterpret_cast<void **>(PtrsBlock.base()); |
| for (unsigned I = 0; I < NumStubs; ++I) |
| Ptr[I] = InitialPtrVal; |
| |
| StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem)); |
| |
| return Error::success(); |
| } |
| |
| void OrcX86_64_SysV::writeResolverCode(uint8_t *ResolverMem, |
| JITReentryFn ReentryFn, |
| void *CallbackMgr) { |
| |
| const uint8_t ResolverCode[] = { |
| // resolver_entry: |
| 0x55, // 0x00: pushq %rbp |
| 0x48, 0x89, 0xe5, // 0x01: movq %rsp, %rbp |
| 0x50, // 0x04: pushq %rax |
| 0x53, // 0x05: pushq %rbx |
| 0x51, // 0x06: pushq %rcx |
| 0x52, // 0x07: pushq %rdx |
| 0x56, // 0x08: pushq %rsi |
| 0x57, // 0x09: pushq %rdi |
| 0x41, 0x50, // 0x0a: pushq %r8 |
| 0x41, 0x51, // 0x0c: pushq %r9 |
| 0x41, 0x52, // 0x0e: pushq %r10 |
| 0x41, 0x53, // 0x10: pushq %r11 |
| 0x41, 0x54, // 0x12: pushq %r12 |
| 0x41, 0x55, // 0x14: pushq %r13 |
| 0x41, 0x56, // 0x16: pushq %r14 |
| 0x41, 0x57, // 0x18: pushq %r15 |
| 0x48, 0x81, 0xec, 0x08, 0x02, 0x00, 0x00, // 0x1a: subq 0x208, %rsp |
| 0x48, 0x0f, 0xae, 0x04, 0x24, // 0x21: fxsave64 (%rsp) |
| 0x48, 0xbf, // 0x26: movabsq <CBMgr>, %rdi |
| |
| // 0x28: Callback manager addr. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| |
| 0x48, 0x8b, 0x75, 0x08, // 0x30: movq 8(%rbp), %rsi |
| 0x48, 0x83, 0xee, 0x06, // 0x34: subq $6, %rsi |
| 0x48, 0xb8, // 0x38: movabsq <REntry>, %rax |
| |
| // 0x3a: JIT re-entry fn addr: |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| |
| 0xff, 0xd0, // 0x42: callq *%rax |
| 0x48, 0x89, 0x45, 0x08, // 0x44: movq %rax, 8(%rbp) |
| 0x48, 0x0f, 0xae, 0x0c, 0x24, // 0x48: fxrstor64 (%rsp) |
| 0x48, 0x81, 0xc4, 0x08, 0x02, 0x00, 0x00, // 0x4d: addq 0x208, %rsp |
| 0x41, 0x5f, // 0x54: popq %r15 |
| 0x41, 0x5e, // 0x56: popq %r14 |
| 0x41, 0x5d, // 0x58: popq %r13 |
| 0x41, 0x5c, // 0x5a: popq %r12 |
| 0x41, 0x5b, // 0x5c: popq %r11 |
| 0x41, 0x5a, // 0x5e: popq %r10 |
| 0x41, 0x59, // 0x60: popq %r9 |
| 0x41, 0x58, // 0x62: popq %r8 |
| 0x5f, // 0x64: popq %rdi |
| 0x5e, // 0x65: popq %rsi |
| 0x5a, // 0x66: popq %rdx |
| 0x59, // 0x67: popq %rcx |
| 0x5b, // 0x68: popq %rbx |
| 0x58, // 0x69: popq %rax |
| 0x5d, // 0x6a: popq %rbp |
| 0xc3, // 0x6b: retq |
| }; |
| |
| const unsigned ReentryFnAddrOffset = 0x3a; |
| const unsigned CallbackMgrAddrOffset = 0x28; |
| |
| memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode)); |
| memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn)); |
| memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr, |
| sizeof(CallbackMgr)); |
| } |
| |
| void OrcX86_64_Win32::writeResolverCode(uint8_t *ResolverMem, |
| JITReentryFn ReentryFn, |
| void *CallbackMgr) { |
| |
| // resolverCode is similar to OrcX86_64 with differences specific to windows x64 calling convention: |
| // arguments go into rcx, rdx and come in reverse order, shadow space allocation on stack |
| const uint8_t ResolverCode[] = { |
| // resolver_entry: |
| 0x55, // 0x00: pushq %rbp |
| 0x48, 0x89, 0xe5, // 0x01: movq %rsp, %rbp |
| 0x50, // 0x04: pushq %rax |
| 0x53, // 0x05: pushq %rbx |
| 0x51, // 0x06: pushq %rcx |
| 0x52, // 0x07: pushq %rdx |
| 0x56, // 0x08: pushq %rsi |
| 0x57, // 0x09: pushq %rdi |
| 0x41, 0x50, // 0x0a: pushq %r8 |
| 0x41, 0x51, // 0x0c: pushq %r9 |
| 0x41, 0x52, // 0x0e: pushq %r10 |
| 0x41, 0x53, // 0x10: pushq %r11 |
| 0x41, 0x54, // 0x12: pushq %r12 |
| 0x41, 0x55, // 0x14: pushq %r13 |
| 0x41, 0x56, // 0x16: pushq %r14 |
| 0x41, 0x57, // 0x18: pushq %r15 |
| 0x48, 0x81, 0xec, 0x08, 0x02, 0x00, 0x00, // 0x1a: subq 0x208, %rsp |
| 0x48, 0x0f, 0xae, 0x04, 0x24, // 0x21: fxsave64 (%rsp) |
| |
| 0x48, 0xb9, // 0x26: movabsq <CBMgr>, %rcx |
| // 0x28: Callback manager addr. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| |
| 0x48, 0x8B, 0x55, 0x08, // 0x30: mov rdx, [rbp+0x8] |
| 0x48, 0x83, 0xea, 0x06, // 0x34: sub rdx, 0x6 |
| |
| 0x48, 0xb8, // 0x38: movabsq <REntry>, %rax |
| // 0x3a: JIT re-entry fn addr: |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| |
| // 0x42: sub rsp, 0x20 (Allocate shadow space) |
| 0x48, 0x83, 0xEC, 0x20, |
| 0xff, 0xd0, // 0x46: callq *%rax |
| |
| // 0x48: add rsp, 0x20 (Free shadow space) |
| 0x48, 0x83, 0xC4, 0x20, |
| |
| 0x48, 0x89, 0x45, 0x08, // 0x4C: movq %rax, 8(%rbp) |
| 0x48, 0x0f, 0xae, 0x0c, 0x24, // 0x50: fxrstor64 (%rsp) |
| 0x48, 0x81, 0xc4, 0x08, 0x02, 0x00, 0x00, // 0x55: addq 0x208, %rsp |
| 0x41, 0x5f, // 0x5C: popq %r15 |
| 0x41, 0x5e, // 0x5E: popq %r14 |
| 0x41, 0x5d, // 0x60: popq %r13 |
| 0x41, 0x5c, // 0x62: popq %r12 |
| 0x41, 0x5b, // 0x64: popq %r11 |
| 0x41, 0x5a, // 0x66: popq %r10 |
| 0x41, 0x59, // 0x68: popq %r9 |
| 0x41, 0x58, // 0x6a: popq %r8 |
| 0x5f, // 0x6c: popq %rdi |
| 0x5e, // 0x6d: popq %rsi |
| 0x5a, // 0x6e: popq %rdx |
| 0x59, // 0x6f: popq %rcx |
| 0x5b, // 0x70: popq %rbx |
| 0x58, // 0x71: popq %rax |
| 0x5d, // 0x72: popq %rbp |
| 0xc3, // 0x73: retq |
| }; |
| |
| |
| const unsigned ReentryFnAddrOffset = 0x3a; |
| const unsigned CallbackMgrAddrOffset = 0x28; |
| |
| memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode)); |
| memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn)); |
| memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr, |
| sizeof(CallbackMgr)); |
| } |
| |
| void OrcI386::writeResolverCode(uint8_t *ResolverMem, JITReentryFn ReentryFn, |
| void *CallbackMgr) { |
| |
| const uint8_t ResolverCode[] = { |
| // resolver_entry: |
| 0x55, // 0x00: pushl %ebp |
| 0x89, 0xe5, // 0x01: movl %esp, %ebp |
| 0x54, // 0x03: pushl %esp |
| 0x83, 0xe4, 0xf0, // 0x04: andl $-0x10, %esp |
| 0x50, // 0x07: pushl %eax |
| 0x53, // 0x08: pushl %ebx |
| 0x51, // 0x09: pushl %ecx |
| 0x52, // 0x0a: pushl %edx |
| 0x56, // 0x0b: pushl %esi |
| 0x57, // 0x0c: pushl %edi |
| 0x81, 0xec, 0x18, 0x02, 0x00, 0x00, // 0x0d: subl $0x218, %esp |
| 0x0f, 0xae, 0x44, 0x24, 0x10, // 0x13: fxsave 0x10(%esp) |
| 0x8b, 0x75, 0x04, // 0x18: movl 0x4(%ebp), %esi |
| 0x83, 0xee, 0x05, // 0x1b: subl $0x5, %esi |
| 0x89, 0x74, 0x24, 0x04, // 0x1e: movl %esi, 0x4(%esp) |
| 0xc7, 0x04, 0x24, 0x00, 0x00, 0x00, |
| 0x00, // 0x22: movl <cbmgr>, (%esp) |
| 0xb8, 0x00, 0x00, 0x00, 0x00, // 0x29: movl <reentry>, %eax |
| 0xff, 0xd0, // 0x2e: calll *%eax |
| 0x89, 0x45, 0x04, // 0x30: movl %eax, 0x4(%ebp) |
| 0x0f, 0xae, 0x4c, 0x24, 0x10, // 0x33: fxrstor 0x10(%esp) |
| 0x81, 0xc4, 0x18, 0x02, 0x00, 0x00, // 0x38: addl $0x218, %esp |
| 0x5f, // 0x3e: popl %edi |
| 0x5e, // 0x3f: popl %esi |
| 0x5a, // 0x40: popl %edx |
| 0x59, // 0x41: popl %ecx |
| 0x5b, // 0x42: popl %ebx |
| 0x58, // 0x43: popl %eax |
| 0x8b, 0x65, 0xfc, // 0x44: movl -0x4(%ebp), %esp |
| 0x5d, // 0x48: popl %ebp |
| 0xc3 // 0x49: retl |
| }; |
| |
| const unsigned ReentryFnAddrOffset = 0x2a; |
| const unsigned CallbackMgrAddrOffset = 0x25; |
| |
| memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode)); |
| memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn)); |
| memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr, |
| sizeof(CallbackMgr)); |
| } |
| |
| void OrcI386::writeTrampolines(uint8_t *TrampolineMem, void *ResolverAddr, |
| unsigned NumTrampolines) { |
| |
| uint64_t CallRelImm = 0xF1C4C400000000e8; |
| uint64_t Resolver = reinterpret_cast<uint64_t>(ResolverAddr); |
| uint64_t ResolverRel = |
| Resolver - reinterpret_cast<uint64_t>(TrampolineMem) - 5; |
| |
| uint64_t *Trampolines = reinterpret_cast<uint64_t *>(TrampolineMem); |
| for (unsigned I = 0; I < NumTrampolines; ++I, ResolverRel -= TrampolineSize) |
| Trampolines[I] = CallRelImm | (ResolverRel << 8); |
| } |
| |
| Error OrcI386::emitIndirectStubsBlock(IndirectStubsInfo &StubsInfo, |
| unsigned MinStubs, void *InitialPtrVal) { |
| // Stub format is: |
| // |
| // .section __orc_stubs |
| // stub1: |
| // jmpq *ptr1 |
| // .byte 0xC4 ; <- Invalid opcode padding. |
| // .byte 0xF1 |
| // stub2: |
| // jmpq *ptr2 |
| // |
| // ... |
| // |
| // .section __orc_ptrs |
| // ptr1: |
| // .quad 0x0 |
| // ptr2: |
| // .quad 0x0 |
| // |
| // ... |
| |
| const unsigned StubSize = IndirectStubsInfo::StubSize; |
| |
| // Emit at least MinStubs, rounded up to fill the pages allocated. |
| unsigned PageSize = sys::Process::getPageSize(); |
| unsigned NumPages = ((MinStubs * StubSize) + (PageSize - 1)) / PageSize; |
| unsigned NumStubs = (NumPages * PageSize) / StubSize; |
| |
| // Allocate memory for stubs and pointers in one call. |
| std::error_code EC; |
| auto StubsMem = sys::OwningMemoryBlock(sys::Memory::allocateMappedMemory( |
| 2 * NumPages * PageSize, nullptr, |
| sys::Memory::MF_READ | sys::Memory::MF_WRITE, EC)); |
| |
| if (EC) |
| return errorCodeToError(EC); |
| |
| // Create separate MemoryBlocks representing the stubs and pointers. |
| sys::MemoryBlock StubsBlock(StubsMem.base(), NumPages * PageSize); |
| sys::MemoryBlock PtrsBlock(static_cast<char *>(StubsMem.base()) + |
| NumPages * PageSize, |
| NumPages * PageSize); |
| |
| // Populate the stubs page stubs and mark it executable. |
| uint64_t *Stub = reinterpret_cast<uint64_t *>(StubsBlock.base()); |
| uint64_t PtrAddr = reinterpret_cast<uint64_t>(PtrsBlock.base()); |
| for (unsigned I = 0; I < NumStubs; ++I, PtrAddr += 4) |
| Stub[I] = 0xF1C40000000025ff | (PtrAddr << 16); |
| |
| if (auto EC = sys::Memory::protectMappedMemory( |
| StubsBlock, sys::Memory::MF_READ | sys::Memory::MF_EXEC)) |
| return errorCodeToError(EC); |
| |
| // Initialize all pointers to point at FailureAddress. |
| void **Ptr = reinterpret_cast<void **>(PtrsBlock.base()); |
| for (unsigned I = 0; I < NumStubs; ++I) |
| Ptr[I] = InitialPtrVal; |
| |
| StubsInfo = IndirectStubsInfo(NumStubs, std::move(StubsMem)); |
| |
| return Error::success(); |
| } |
| |
| } // End namespace orc. |
| } // End namespace llvm. |
