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Subtract and add to rsp

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This commit is contained in:
offtkp 2025-02-25 01:14:28 +02:00
parent 4e23005dc6
commit 5f2233265b
1 changed files with 20 additions and 0 deletions
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20
src/core/cpu_patches.cpp
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@ -202,19 +202,39 @@ static void RestoreStack(Xbyak::CodeGenerator& c) {
/// Switches to the patch stack, saves registers, and restores the original stack. /// Switches to the patch stack, saves registers, and restores the original stack.
static void SaveRegisters(Xbyak::CodeGenerator& c, const std::initializer_list<Xbyak::Reg> regs) { static void SaveRegisters(Xbyak::CodeGenerator& c, const std::initializer_list<Xbyak::Reg> regs) {
// Uses a more robust solution for saving registers on MacOS to avoid potential stack corruption
// if games decide to not follow the ABI and use the red zone.
#ifdef __APPLE__
SaveStack(c);
#else
c.lea(rsp, ptr[rsp - 128]); // red zone c.lea(rsp, ptr[rsp - 128]); // red zone
#endif
for (const auto& reg : regs) { for (const auto& reg : regs) {
c.push(reg.cvt64()); c.push(reg.cvt64());
} }
#ifdef __APPLE__
RestoreStack(c);
#else
c.lea(rsp, ptr[rsp + 128]);
#endif
} }
/// Switches to the patch stack, restores registers, and restores the original stack. /// Switches to the patch stack, restores registers, and restores the original stack.
static void RestoreRegisters(Xbyak::CodeGenerator& c, static void RestoreRegisters(Xbyak::CodeGenerator& c,
const std::initializer_list<Xbyak::Reg> regs) { const std::initializer_list<Xbyak::Reg> regs) {
#ifdef __APPLE__
SaveStack(c);
#else
c.lea(rsp, ptr[rsp - 128]); // red zone
#endif
for (const auto& reg : regs) { for (const auto& reg : regs) {
c.pop(reg.cvt64()); c.pop(reg.cvt64());
} }
#ifdef __APPLE__
RestoreStack(c);
#else
c.lea(rsp, ptr[rsp + 128]); c.lea(rsp, ptr[rsp + 128]);
#endif
} }
/// Switches to the patch stack and stores all registers. /// Switches to the patch stack and stores all registers.