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Patch movntss and movntsd (#3049)

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* Patch movntss and movntsd

* clang-format

* Deduplication

* Allow rep to be in other places
This commit is contained in:
Paris Oplopoios 2025-06-08 22:29:33 +03:00 • committed by GitHub
parent a07a6bb9d3
commit 5004e41100
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GPG key ID: B5690EEEBB952194
1 changed files with 47 additions and 6 deletions
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53
src/core/cpu_patches.cpp
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@ -88,7 +88,8 @@ static bool FilterTcbAccess(const ZydisDecodedOperand* operands) {
dst_op.reg.value <= ZYDIS_REGISTER_R15;
}
static void GenerateTcbAccess(const ZydisDecodedOperand* operands, Xbyak::CodeGenerator& c) {
static void GenerateTcbAccess(void* /* address */, const ZydisDecodedOperand* operands,
Xbyak::CodeGenerator& c) {
const auto dst = ZydisToXbyakRegisterOperand(operands[0]);
#if defined(_WIN32)
@ -126,7 +127,8 @@ static bool FilterNoSSE4a(const ZydisDecodedOperand*) {
return !cpu.has(Cpu::tSSE4a);
}
static void GenerateEXTRQ(const ZydisDecodedOperand* operands, Xbyak::CodeGenerator& c) {
static void GenerateEXTRQ(void* /* address */, const ZydisDecodedOperand* operands,
Xbyak::CodeGenerator& c) {
bool immediateForm = operands[1].type == ZYDIS_OPERAND_TYPE_IMMEDIATE &&
operands[2].type == ZYDIS_OPERAND_TYPE_IMMEDIATE;
@ -245,7 +247,8 @@ static void GenerateEXTRQ(const ZydisDecodedOperand* operands, Xbyak::CodeGenera
}
}
static void GenerateINSERTQ(const ZydisDecodedOperand* operands, Xbyak::CodeGenerator& c) {
static void GenerateINSERTQ(void* /* address */, const ZydisDecodedOperand* operands,
Xbyak::CodeGenerator& c) {
bool immediateForm = operands[2].type == ZYDIS_OPERAND_TYPE_IMMEDIATE &&
operands[3].type == ZYDIS_OPERAND_TYPE_IMMEDIATE;
@ -383,8 +386,44 @@ static void GenerateINSERTQ(const ZydisDecodedOperand* operands, Xbyak::CodeGene
}
}
static void ReplaceMOVNT(void* address, u8 rep_prefix) {
// Find the opcode byte
// There can be any amount of prefixes but the instruction can't be more than 15 bytes
// And we know for sure this is a MOVNTSS/MOVNTSD
bool found = false;
bool rep_prefix_found = false;
int index = 0;
u8* ptr = reinterpret_cast<u8*>(address);
for (int i = 0; i < 15; i++) {
if (ptr[i] == rep_prefix) {
rep_prefix_found = true;
} else if (ptr[i] == 0x2B) {
index = i;
found = true;
break;
}
}
// Some sanity checks
ASSERT(found);
ASSERT(index >= 2);
ASSERT(ptr[index - 1] == 0x0F);
ASSERT(rep_prefix_found);
// This turns the MOVNTSS/MOVNTSD to a MOVSS/MOVSD m, xmm
ptr[index] = 0x11;
}
static void ReplaceMOVNTSS(void* address, const ZydisDecodedOperand*, Xbyak::CodeGenerator&) {
ReplaceMOVNT(address, 0xF3);
}
static void ReplaceMOVNTSD(void* address, const ZydisDecodedOperand*, Xbyak::CodeGenerator&) {
ReplaceMOVNT(address, 0xF2);
}
using PatchFilter = bool (*)(const ZydisDecodedOperand*);
using InstructionGenerator = void (*)(const ZydisDecodedOperand*, Xbyak::CodeGenerator&);
using InstructionGenerator = void (*)(void*, const ZydisDecodedOperand*, Xbyak::CodeGenerator&);
struct PatchInfo {
/// Filter for more granular patch conditions past just the instruction mnemonic.
PatchFilter filter;
@ -400,6 +439,8 @@ static const std::unordered_map<ZydisMnemonic, PatchInfo> Patches = {
// SSE4a
{ZYDIS_MNEMONIC_EXTRQ, {FilterNoSSE4a, GenerateEXTRQ, true}},
{ZYDIS_MNEMONIC_INSERTQ, {FilterNoSSE4a, GenerateINSERTQ, true}},
{ZYDIS_MNEMONIC_MOVNTSS, {FilterNoSSE4a, ReplaceMOVNTSS, false}},
{ZYDIS_MNEMONIC_MOVNTSD, {FilterNoSSE4a, ReplaceMOVNTSD, false}},
#if defined(_WIN32)
// Windows needs a trampoline.
@ -477,7 +518,7 @@ static std::pair<bool, u64> TryPatch(u8* code, PatchModule* module) {
auto& trampoline_gen = module->trampoline_gen;
const auto trampoline_ptr = trampoline_gen.getCurr();
patch_info.generator(operands, trampoline_gen);
patch_info.generator(code, operands, trampoline_gen);
// Return to the following instruction at the end of the trampoline.
trampoline_gen.jmp(code + instruction.length);
@ -485,7 +526,7 @@ static std::pair<bool, u64> TryPatch(u8* code, PatchModule* module) {
// Replace instruction with near jump to the trampoline.
patch_gen.jmp(trampoline_ptr, Xbyak::CodeGenerator::LabelType::T_NEAR);
} else {
patch_info.generator(operands, patch_gen);
patch_info.generator(code, operands, patch_gen);
}
const auto patch_size = patch_gen.getCurr() - code;