mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-11-04 05:17:07 +00:00
4943838e28
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235325 91177308-0d34-0410-b5e6-96231b3b80d8
139 lines
4.4 KiB
C++
139 lines
4.4 KiB
C++
#include "llvm/ADT/Triple.h"
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#include "llvm/ExecutionEngine/Orc/OrcTargetSupport.h"
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#include <array>
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using namespace llvm::orc;
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namespace {
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uint64_t executeCompileCallback(JITCompileCallbackManagerBase *JCBM,
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TargetAddress CallbackID) {
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return JCBM->executeCompileCallback(CallbackID);
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}
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}
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namespace llvm {
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namespace orc {
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const char* OrcX86_64::ResolverBlockName = "orc_resolver_block";
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void OrcX86_64::insertResolverBlock(
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Module &M, JITCompileCallbackManagerBase &JCBM) {
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// Trampoline code-sequence length, used to get trampoline address from return
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// address.
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const unsigned X86_64_TrampolineLength = 6;
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// List of x86-64 GPRs to save. Note - RBP saved separately below.
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std::array<const char *, 14> GPRs = {{
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"rax", "rbx", "rcx", "rdx",
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"rsi", "rdi", "r8", "r9",
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"r10", "r11", "r12", "r13",
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"r14", "r15"
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}};
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// Address of the executeCompileCallback function.
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uint64_t CallbackAddr =
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static_cast<uint64_t>(
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reinterpret_cast<uintptr_t>(executeCompileCallback));
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std::ostringstream AsmStream;
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Triple TT(M.getTargetTriple());
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// Switch to text section.
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if (TT.getOS() == Triple::Darwin)
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AsmStream << ".section __TEXT,__text,regular,pure_instructions\n"
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<< ".align 4, 0x90\n";
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else
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AsmStream << ".text\n"
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<< ".align 16, 0x90\n";
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// Bake in a pointer to the callback manager immediately before the
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// start of the resolver function.
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AsmStream << "jit_callback_manager_addr:\n"
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<< " .quad " << &JCBM << "\n";
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// Start the resolver function.
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AsmStream << ResolverBlockName << ":\n"
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<< " pushq %rbp\n"
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<< " movq %rsp, %rbp\n";
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// Store the GPRs.
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for (const auto &GPR : GPRs)
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AsmStream << " pushq %" << GPR << "\n";
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// Store floating-point state with FXSAVE.
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// Note: We need to keep the stack 16-byte aligned, so if we've emitted an odd
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// number of 64-bit pushes so far (GPRs.size() plus 1 for RBP) then add
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// an extra 64 bits of padding to the FXSave area.
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unsigned Padding = (GPRs.size() + 1) % 2 ? 8 : 0;
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unsigned FXSaveSize = 512 + Padding;
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AsmStream << " subq $" << FXSaveSize << ", %rsp\n"
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<< " fxsave64 (%rsp)\n"
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// Load callback manager address, compute trampoline address, call JIT.
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<< " lea jit_callback_manager_addr(%rip), %rdi\n"
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<< " movq (%rdi), %rdi\n"
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<< " movq 0x8(%rbp), %rsi\n"
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<< " subq $" << X86_64_TrampolineLength << ", %rsi\n"
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<< " movabsq $" << CallbackAddr << ", %rax\n"
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<< " callq *%rax\n"
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// Replace the return to the trampoline with the return address of the
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// compiled function body.
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<< " movq %rax, 0x8(%rbp)\n"
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// Restore the floating point state.
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<< " fxrstor64 (%rsp)\n"
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<< " addq $" << FXSaveSize << ", %rsp\n";
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for (const auto &GPR : make_range(GPRs.rbegin(), GPRs.rend()))
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AsmStream << " popq %" << GPR << "\n";
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// Restore original RBP and return to compiled function body.
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AsmStream << " popq %rbp\n"
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<< " retq\n";
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M.appendModuleInlineAsm(AsmStream.str());
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}
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OrcX86_64::LabelNameFtor
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OrcX86_64::insertCompileCallbackTrampolines(Module &M,
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TargetAddress ResolverBlockAddr,
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unsigned NumCalls,
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unsigned StartIndex) {
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const char *ResolverBlockPtrName = "Lorc_resolve_block_addr";
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std::ostringstream AsmStream;
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Triple TT(M.getTargetTriple());
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if (TT.getOS() == Triple::Darwin)
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AsmStream << ".section __TEXT,__text,regular,pure_instructions\n"
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<< ".align 4, 0x90\n";
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else
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AsmStream << ".text\n"
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<< ".align 16, 0x90\n";
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AsmStream << ResolverBlockPtrName << ":\n"
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<< " .quad " << ResolverBlockAddr << "\n";
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auto GetLabelName =
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[=](unsigned I) {
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std::ostringstream LabelStream;
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LabelStream << "orc_jcc_" << (StartIndex + I);
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return LabelStream.str();
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};
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for (unsigned I = 0; I < NumCalls; ++I)
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AsmStream << GetLabelName(I) << ":\n"
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<< " callq *" << ResolverBlockPtrName << "(%rip)\n";
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M.appendModuleInlineAsm(AsmStream.str());
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return GetLabelName;
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}
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} // End namespace orc.
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} // End namespace llvm.
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