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Fastcc passes arguments in EAX and EDX, make sure the JIT doesn't clobber them

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22137 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-05-19 06:49:17 +00:00
parent 16cb6f82eb
commit 1030f72f8a
1 changed files with 39 additions and 6 deletions
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45
lib/Target/X86/X86JITInfo.cpp
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@ -36,19 +36,52 @@ void X86JITInfo::replaceMachineCodeForFunction(void *Old, void *New) {
/// compile a function lazily.
static TargetJITInfo::JITCompilerFn JITCompilerFunction;
/// CompilationCallback - This is the target-specific function invoked by the
// Provide a wrapper for X86CompilationCallback2 that saves non-traditional
// callee saved registers, for the fastcc calling convention.
extern "C" void X86CompilationCallback(void);
#if defined(__i386__) || defined(i386)
#ifndef _MSC_VER
asm(
".text\n"
".align 8\n"
".globl X86CompilationCallback\n"
"X86CompilationCallback:\n"
"pushl %ebp\n"
"movl %esp, %ebp\n" // Standard prologue
"pushl %eax\n"
"pushl %edx\n" // save EAX/EDX
"call X86CompilationCallback2\n"
"popl %edx\n"
"popl %eax\n"
"popl %ebp\n"
"ret\n");
#else
// FIXME: implement this for VC++
#endif
#else
// Not an i386 host
void X86CompilationCallback() {
assert(0 && "This is not a X86, you can't execute this!");
abort();
}
#endif
/// X86CompilationCallback - This is the target-specific function invoked by the
/// function stub when we did not know the real target of a call. This function
/// must locate the start of the stub or call site and pass it into the JIT
/// compiler function.
static void CompilationCallback() {
extern "C" void X86CompilationCallback2() {
#ifdef _MSC_VER
// FIXME: This needs to go up one more level!
unsigned *StackPtr, RetAddr;
__asm mov StackPtr, ebp;
__asm mov eax, DWORD PTR [ebp + 4];
__asm mov RetAddr, eax;
#else
unsigned *StackPtr = (unsigned*)__builtin_frame_address(0);
unsigned RetAddr = (unsigned)(intptr_t)__builtin_return_address(0);
unsigned *StackPtr = (unsigned*)__builtin_frame_address(1);
unsigned RetAddr = (unsigned)(intptr_t)__builtin_return_address(1);
// NOTE: __builtin_frame_address doesn't work if frame pointer elimination has
// been performed. Having a variable sized alloca disables frame pointer
@ -100,11 +133,11 @@ static void CompilationCallback() {
TargetJITInfo::LazyResolverFn
X86JITInfo::getLazyResolverFunction(JITCompilerFn F) {
JITCompilerFunction = F;
return CompilationCallback;
return X86CompilationCallback;
}
void *X86JITInfo::emitFunctionStub(void *Fn, MachineCodeEmitter &MCE) {
if (Fn != CompilationCallback) {
if (Fn != X86CompilationCallback) {
MCE.startFunctionStub(5);
MCE.emitByte(0xE9);
MCE.emitWord((intptr_t)Fn-MCE.getCurrentPCValue()-4);