+//===------- 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>
-using namespace llvm;
+using namespace llvm::orc;
namespace {
-std::array<const char *, 12> X86GPRsToSave = {{
- "rbp", "rbx", "r12", "r13", "r14", "r15", // Callee saved.
- "rdi", "rsi", "rdx", "rcx", "r8", "r9", // Int args.
-}};
-
-std::array<const char *, 8> X86XMMsToSave = {{
- "xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7" // FP args
-}};
-
-template <typename OStream> unsigned saveX86Regs(OStream &OS) {
- for (const auto &GPR : X86GPRsToSave)
- OS << " pushq %" << GPR << "\n";
-
- OS << " subq $" << (16 * X86XMMsToSave.size()) << ", %rsp\n";
-
- for (unsigned i = 0; i < X86XMMsToSave.size(); ++i)
- OS << " movdqu %" << X86XMMsToSave[i] << ", "
- << (16 * (X86XMMsToSave.size() - i - 1)) << "(%rsp)\n";
-
- return (8 * X86GPRsToSave.size()) + (16 * X86XMMsToSave.size());
-}
-
-template <typename OStream> void restoreX86Regs(OStream &OS) {
- for (unsigned i = 0; i < X86XMMsToSave.size(); ++i)
- OS << " movdqu " << (16 * i) << "(%rsp), %"
- << X86XMMsToSave[(X86XMMsToSave.size() - i - 1)] << "\n";
- OS << " addq $" << (16 * X86XMMsToSave.size()) << ", %rsp\n";
-
- for (unsigned i = 0; i < X86GPRsToSave.size(); ++i)
- OS << " popq %" << X86GPRsToSave[X86GPRsToSave.size() - i - 1] << "\n";
-}
-
-template <typename TargetT>
-uint64_t executeCompileCallback(JITCompileCallbackManagerBase<TargetT> *JCBM,
+uint64_t executeCompileCallback(JITCompileCallbackManagerBase *JCBM,
TargetAddress CallbackID) {
return JCBM->executeCompileCallback(CallbackID);
}
}
namespace llvm {
+namespace orc {
const char* OrcX86_64::ResolverBlockName = "orc_resolver_block";
void OrcX86_64::insertResolverBlock(
- Module &M,
- JITCompileCallbackManagerBase<OrcX86_64> &JCBM) {
+ Module &M, JITCompileCallbackManagerBase &JCBM) {
+
+ // Trampoline code-sequence length, used to get trampoline address from return
+ // address.
+ const unsigned X86_64_TrampolineLength = 6;
+
+ // List of x86-64 GPRs to save. Note - RBP saved separately below.
+ std::array<const char *, 14> GPRs = {{
+ "rax", "rbx", "rcx", "rdx",
+ "rsi", "rdi", "r8", "r9",
+ "r10", "r11", "r12", "r13",
+ "r14", "r15"
+ }};
+
+ // Address of the executeCompileCallback function.
uint64_t CallbackAddr =
static_cast<uint64_t>(
- reinterpret_cast<uintptr_t>(executeCompileCallback<OrcX86_64>));
+ reinterpret_cast<uintptr_t>(executeCompileCallback));
std::ostringstream AsmStream;
Triple TT(M.getTargetTriple());
+ // Switch to text section.
if (TT.getOS() == Triple::Darwin)
AsmStream << ".section __TEXT,__text,regular,pure_instructions\n"
<< ".align 4, 0x90\n";
AsmStream << ".text\n"
<< ".align 16, 0x90\n";
+ // Bake in a pointer to the callback manager immediately before the
+ // start of the resolver function.
AsmStream << "jit_callback_manager_addr:\n"
- << " .quad " << &JCBM << "\n"
- << ResolverBlockName << ":\n";
-
- uint64_t ReturnAddrOffset = saveX86Regs(AsmStream);
-
- // Compute index, load object address, and call JIT.
- AsmStream << " leaq jit_callback_manager_addr(%rip), %rdi\n"
- << " movq (%rdi), %rdi\n"
- << " movq " << ReturnAddrOffset << "(%rsp), %rsi\n"
- << " movabsq $" << CallbackAddr << ", %rax\n"
- << " callq *%rax\n"
- << " movq %rax, " << ReturnAddrOffset << "(%rsp)\n";
-
- restoreX86Regs(AsmStream);
-
- AsmStream << " retq\n";
+ << " .quad " << &JCBM << "\n";
+
+ // Start the resolver function.
+ AsmStream << ResolverBlockName << ":\n"
+ << " pushq %rbp\n"
+ << " movq %rsp, %rbp\n";
+
+ // Store the GPRs.
+ for (const auto &GPR : GPRs)
+ AsmStream << " pushq %" << GPR << "\n";
+
+ // Store floating-point state with FXSAVE.
+ // Note: We need to keep the stack 16-byte aligned, so if we've emitted an odd
+ // number of 64-bit pushes so far (GPRs.size() plus 1 for RBP) then add
+ // an extra 64 bits of padding to the FXSave area.
+ unsigned Padding = (GPRs.size() + 1) % 2 ? 8 : 0;
+ unsigned FXSaveSize = 512 + Padding;
+ AsmStream << " subq $" << FXSaveSize << ", %rsp\n"
+ << " fxsave64 (%rsp)\n"
+
+ // Load callback manager address, compute trampoline address, call JIT.
+ << " lea jit_callback_manager_addr(%rip), %rdi\n"
+ << " movq (%rdi), %rdi\n"
+ << " movq 0x8(%rbp), %rsi\n"
+ << " subq $" << X86_64_TrampolineLength << ", %rsi\n"
+ << " movabsq $" << CallbackAddr << ", %rax\n"
+ << " callq *%rax\n"
+
+ // Replace the return to the trampoline with the return address of the
+ // compiled function body.
+ << " movq %rax, 0x8(%rbp)\n"
+
+ // Restore the floating point state.
+ << " fxrstor64 (%rsp)\n"
+ << " addq $" << FXSaveSize << ", %rsp\n";
+
+ for (const auto &GPR : make_range(GPRs.rbegin(), GPRs.rend()))
+ AsmStream << " popq %" << GPR << "\n";
+
+ // Restore original RBP and return to compiled function body.
+ AsmStream << " popq %rbp\n"
+ << " retq\n";
M.appendModuleInlineAsm(AsmStream.str());
}
return GetLabelName;
}
+OrcX86_64::IndirectStubsInfo::IndirectStubsInfo(IndirectStubsInfo &&Other) {
+ StubsBlock = std::move(Other.StubsBlock);
+ PtrsBlock = std::move(Other.PtrsBlock);
+ Other.StubsBlock = sys::MemoryBlock();
+ Other.PtrsBlock = sys::MemoryBlock();
+}
+
+OrcX86_64::IndirectStubsInfo&
+OrcX86_64::IndirectStubsInfo::operator=(IndirectStubsInfo &&Other) {
+ StubsBlock = std::move(Other.StubsBlock);
+ PtrsBlock = std::move(Other.PtrsBlock);
+ Other.StubsBlock = sys::MemoryBlock();
+ Other.PtrsBlock = sys::MemoryBlock();
+ return *this;
+}
+
+OrcX86_64::IndirectStubsInfo::~IndirectStubsInfo() {
+ sys::Memory::releaseMappedMemory(StubsBlock);
+ sys::Memory::releaseMappedMemory(PtrsBlock);
}
+
+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 InitialBlock = 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(InitialBlock.base(), NumPages * PageSize);
+ sys::MemoryBlock PtrsBlock(static_cast<char*>(InitialBlock.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.StubsBlock = std::move(StubsBlock);
+ StubsInfo.PtrsBlock = std::move(PtrsBlock);
+
+ return std::error_code();
+}
+
+} // End namespace orc.
+} // End namespace llvm.
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