diff options
Diffstat (limited to 'contrib/llvm/lib/ExecutionEngine/Orc/OrcArchitectureSupport.cpp')
| -rw-r--r-- | contrib/llvm/lib/ExecutionEngine/Orc/OrcArchitectureSupport.cpp | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/contrib/llvm/lib/ExecutionEngine/Orc/OrcArchitectureSupport.cpp b/contrib/llvm/lib/ExecutionEngine/Orc/OrcArchitectureSupport.cpp new file mode 100644 index 0000000..01e829f --- /dev/null +++ b/contrib/llvm/lib/ExecutionEngine/Orc/OrcArchitectureSupport.cpp @@ -0,0 +1,171 @@ +//===------ OrcArchSupport.cpp - Architecture 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/ADT/Triple.h" +#include "llvm/ExecutionEngine/Orc/OrcArchitectureSupport.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. |
