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loader: native trampoline for VRSQRTPS under --amd-cpu (#893)

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loader: add AMD CPU compatibility patches

Co-authored-by: nmzik <Nmzik@mail.ru>
This commit is contained in:
Ewen trividic
2026-10-03 17:13:12 +02:00
committed by GitHub
parent feeced81d2
commit b11aea803c
9 changed files with 524 additions and 357 deletions
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src/loader/x64InstructionEmulator.cpp
+2 -46
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@@ -2,7 +2,6 @@
#include "common/common.h"
#include <Zydis/Zydis.h>
#include <bit>
#include <cstring>
#if !defined(__APPLE__)
@@ -713,46 +712,6 @@ static bool TryEmulateReciprocalSquareRoot(Context& context) {
#endif
bool IsReciprocalSquareRoot(const ZydisDecodedInstruction& instruction,
const ZydisDecodedOperand* operands) {
return instruction.mnemonic == ZYDIS_MNEMONIC_VRSQRTPS &&
instruction.encoding == ZYDIS_INSTRUCTION_ENCODING_VEX &&
instruction.raw.vex.offset == 0 && operands[0].size == 128 &&
operands[1].type == ZYDIS_OPERAND_TYPE_REGISTER;
}
uint64_t PatchReciprocalSquareRoots(uint64_t address, uint64_t size) {
uint64_t patched = 0;
#if !defined(__APPLE__)
ZydisDecoder decoder {};
if (!ZYAN_SUCCESS(
ZydisDecoderInit(&decoder, ZYDIS_MACHINE_MODE_LONG_64, ZYDIS_STACK_WIDTH_64))) {
return 0;
}
for (uint64_t offset = 0; offset < size;) {
auto* code = reinterpret_cast<uint8_t*>(address + offset);
ZydisDecodedInstruction instruction {};
ZydisDecodedOperand operands[ZYDIS_MAX_OPERAND_COUNT] {};
if (!ZYAN_SUCCESS(
ZydisDecoderDecodeFull(&decoder, code, size - offset, &instruction, operands))) {
++offset;
continue;
}
if (IsReciprocalSquareRoot(instruction, operands)) {
// vvvv is reserved (must be 1111b). Clear one bit to route this
// otherwise intact instruction through the illegal-instruction emulator.
code[instruction.raw.vex.size - 1] &= ~0x08u;
++patched;
}
offset += instruction.length;
}
#else
(void)address;
(void)size;
#endif
return patched;
}
bool TryEmulate(void* native_context) {
if (native_context == nullptr) {
return false;
@@ -769,11 +728,8 @@ bool TryEmulate(void* native_context) {
Context context {static_cast<ucontext_t*>(native_context)};
#endif
#if !defined(__APPLE__)
if (TryEmulateReciprocalSquareRoot(context)) {
return true;
}
return TryEmulateMonitorxMwaitx(context) || TryEmulateSse4a(context) ||
TryEmulateShaNi(context);
return TryEmulateReciprocalSquareRoot(context) || TryEmulateMonitorxMwaitx(context) ||
TryEmulateSse4a(context) || TryEmulateShaNi(context);
#else
return TryEmulateSse4a(context);
#endif