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[Orc] Save all the x86-64 GPRs before re-entering the JIT.

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The re-entry code should work for all calling conventions.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234298 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames 2015-04-07 06:12:21 +00:00
parent c513d37e67
commit d27a0a9b2c
1 changed files with 13 additions and 6 deletions
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19
lib/ExecutionEngine/Orc/OrcTargetSupport.cpp
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@ -25,10 +25,12 @@ void OrcX86_64::insertResolverBlock(
// address.
const unsigned X86_64_TrampolineLength = 6;
// List of x86-64 GPRs to save.
std::array<const char *, 11> GPRs = {{
"rbx", "r12", "r13", "r14", "r15", // Callee saved (rbp preserved below).
"rdi", "rsi", "rdx", "rcx", "r8", "r9", // Int args.
// 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.
@ -62,7 +64,12 @@ void OrcX86_64::insertResolverBlock(
AsmStream << " pushq %" << GPR << "\n";
// Store floating-point state with FXSAVE.
AsmStream << " subq $512, %rsp\n"
// 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"
<< " fxsave (%rsp)\n"
// Load callback manager address, compute trampoline address, call JIT.
@ -79,7 +86,7 @@ void OrcX86_64::insertResolverBlock(
// Restore the floating point state.
<< " fxrstor (%rsp)\n"
<< " addq $512, %rsp\n";
<< " addq $" << FXSaveSize << ", %rsp\n";
for (const auto &GPR : make_range(GPRs.rbegin(), GPRs.rend()))
AsmStream << " popq %" << GPR << "\n";