| //===------- OrcTargetSupport.cpp - Target support utilities for Orc ------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/ADT/Triple.h" |
| #include "llvm/ExecutionEngine/Orc/OrcTargetSupport.h" |
| #include "llvm/Support/Process.h" |
| #include <array> |
| |
| namespace llvm { |
| namespace orc { |
| |
| void OrcX86_64::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 20, %rsp |
| 0x48, 0x0f, 0xae, 0x04, 0x24, // 0x21: fxsave64 (%rsp) |
| 0x48, 0x8d, 0x3d, 0x43, 0x00, 0x00, 0x00, // 0x26: leaq 67(%rip), %rdi |
| 0x48, 0x8b, 0x3f, // 0x2d: movq (%rdi), %rdi |
| 0x48, 0x8b, 0x75, 0x08, // 0x30: movq 8(%rbp), %rsi |
| 0x48, 0x83, 0xee, 0x06, // 0x34: subq $6, %rsi |
| 0x48, 0xb8, // 0x38: movabsq $0, %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 20, %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 |
| 0x00, 0x00, 0x00, 0x00, // 0x6c: <padding> |
| |
| // 0x70: Callback mgr address. |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| }; |
| |
| const unsigned ReentryFnAddrOffset = 0x3a; |
| const unsigned CallbackMgrAddrOffset = 0x70; |
| |
| memcpy(ResolverMem, ResolverCode, sizeof(ResolverCode)); |
| memcpy(ResolverMem + ReentryFnAddrOffset, &ReentryFn, sizeof(ReentryFn)); |
| memcpy(ResolverMem + CallbackMgrAddrOffset, &CallbackMgr, |
| sizeof(CallbackMgr)); |
| } |
| |
| void OrcX86_64::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); |
| } |
| |
| std::error_code OrcX86_64::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 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 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.NumStubs = NumStubs; |
| StubsInfo.StubsMem = std::move(StubsMem); |
| |
| return std::error_code(); |
| } |
| |
| } // End namespace orc. |
| } // End namespace llvm. |
