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Align stack to 16-byte boundary when compiling in 32-bit mode with GCC. This is required to run anything on OS X and to support SSE instructions on Linux.

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git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@439 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
Maarten ter Huurne
2008-09-05 00:02:53 +00:00
parent f96d19a1fb
commit 722ea233a1
7 changed files with 76 additions and 22 deletions
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54
Source/Core/Common/Src/ABI.cpp
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@ -10,42 +10,48 @@ using namespace Gen;
// ====================================
void ABI_CallFunctionC(void *func, u32 param1) {
ABI_AlignStack(1 * 4);
PUSH(32, Imm32(param1));
CALL(func);
ADD(32, R(ESP), Imm8(4));
ABI_RestoreStack(1 * 4);
}
void ABI_CallFunctionCC(void *func, u32 param1, u32 param2) {
ABI_AlignStack(2 * 4);
PUSH(32, Imm32(param2));
PUSH(32, Imm32(param1));
CALL(func);
ADD(32, R(ESP), Imm8(8));
ABI_RestoreStack(2 * 4);
}
// Pass a register as a paremeter.
void ABI_CallFunctionR(void *func, X64Reg reg1) {
ABI_AlignStack(1 * 4);
PUSH(32, R(reg1));
CALL(func);
ADD(32, R(ESP), Imm8(4));
ABI_RestoreStack(1 * 4);
}
void ABI_CallFunctionRR(void *func, Gen::X64Reg reg1, Gen::X64Reg reg2)
{
ABI_AlignStack(2 * 4);
PUSH(32, R(reg2));
PUSH(32, R(reg1));
CALL(func);
ADD(32, R(ESP), Imm8(8));
ABI_RestoreStack(2 * 4);
}
void ABI_CallFunctionAC(void *func, const Gen::OpArg &arg1, u32 param2)
{
ABI_AlignStack(2 * 4);
PUSH(32, arg1);
PUSH(32, Imm32(param2));
CALL(func);
ADD(32, R(ESP), Imm8(8));
ABI_RestoreStack(2 * 4);
}
void ABI_PushAllCalleeSavedRegsAndAdjustStack() {
// Note: 4 * 4 = 16 bytes, so alignment is preserved.
PUSH(EBP);
PUSH(EBX);
PUSH(ESI);
@ -59,6 +65,38 @@ void ABI_PopAllCalleeSavedRegsAndAdjustStack() {
POP(EBP);
}
void ABI_AlignStack(unsigned int frameSize) {
// Mac OS X requires the stack to be 16-byte aligned before every call.
// Linux requires the stack to be 16-byte aligned before calls that put SSE
// vectors on the stack, but since we do not keep track of which calls do that,
// it is effectively every call as well.
// Windows binaries compiled with MSVC do not have such a restriction, but I
// expect that GCC on Windows acts the same as GCC on Linux in this respect.
// It would be nice if someone could verify this.
#ifdef __GNUC__
frameSize += 4; // reserve space for return address
unsigned int paddedSize = (frameSize + 15) & -16;
unsigned int fillSize = paddedSize - frameSize;
if (fillSize != 0) {
SUB(32, R(ESP), Imm8(fillSize));
}
#endif
}
void ABI_RestoreStack(unsigned int frameSize) {
frameSize += 4; // reserve space for return address
unsigned int paddedSize =
#ifdef __GNUC__
(frameSize + 15) & -16;
#else
frameSize;
#endif
paddedSize -= 4; // return address is already consumed
if (paddedSize != 0) {
ADD(32, R(ESP), Imm8(paddedSize));
}
}
#else
// Shared code between Win64 and Unix64
@ -99,6 +137,12 @@ void ABI_CallFunctionAC(void *func, const Gen::OpArg &arg1, u32 param2)
CALL(func);
}
void ABI_AlignStack(unsigned int /*frameSize*/) {
}
void ABI_RestoreStack(unsigned int /*frameSize*/) {
}
#ifdef _WIN32
// Win64 Specific Code