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loader: replace SSE4a EXTRQ with native trampolines on hosts without SSE4a (#839)

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loader: add native EXTRQ patches with trap fallback

Co-authored-by: nmzik <Nmzik@mail.ru>
This commit is contained in:
Ewen trividic
2026-10-03 17:40:51 +02:00
committed by GitHub
parent b11aea803c
commit a4d26cf81a
4 changed files with 585 additions and 152 deletions
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src/loader/guestInstructionPatcher.h
+28 -14
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@@ -11,20 +11,34 @@
namespace Loader {
struct InstructionPatchCounts {
uint64_t found = 0;
uint64_t native = 0;
uint64_t trapped = 0;
uint64_t Skipped() const { return found - native - trapped; }
InstructionPatchCounts& operator+=(const InstructionPatchCounts& other) {
found += other.found;
native += other.native;
trapped += other.trapped;
return *this;
}
};
struct GuestInstructionPatchResult {
uint64_t function_count = 0;
uint64_t instruction_count = 0;
uint64_t red_zone_function_count = 0;
uint64_t memory_instruction_count = 0;
uint64_t short_memory_instruction_count = 0;
uint64_t patched_memory_instruction_count = 0;
uint64_t stack_dependent_memory_instruction_count = 0;
uint64_t control_flow_memory_instruction_count = 0;
uint64_t unrelocatable_memory_instruction_count = 0;
uint64_t indirect_red_zone_function_count = 0;
uint64_t reciprocal_sqrt_instruction_count = 0;
uint64_t patched_reciprocal_sqrt_instruction_count = 0;
uint64_t trapped_reciprocal_sqrt_instruction_count = 0;
uint64_t function_count = 0;
uint64_t instruction_count = 0;
uint64_t red_zone_function_count = 0;
uint64_t memory_instruction_count = 0;
uint64_t short_memory_instruction_count = 0;
uint64_t patched_memory_instruction_count = 0;
uint64_t stack_dependent_memory_instruction_count = 0;
uint64_t control_flow_memory_instruction_count = 0;
uint64_t unrelocatable_memory_instruction_count = 0;
uint64_t indirect_red_zone_function_count = 0;
InstructionPatchCounts reciprocal_sqrt;
InstructionPatchCounts extrq;
};
void RegisterGuestInstructionPatchModule(void* module_ptr, uint64_t module_size,
@@ -34,7 +48,7 @@ void UnregisterGuestInstructionPatchModule(void* module_ptr);
// Apply enabled instruction fixes using native trampolines or safe trap fallbacks.
GuestInstructionPatchResult PatchGuestInstructions(uint64_t segment_addr, uint64_t segment_size,
std::span<const uintptr_t> function_starts,
bool protect_memory, bool emulate_rsqrt);
bool protect_memory, bool emulate_amd);
bool DecodeEhFrameFunctionStarts(uint64_t eh_frame_header_addr, uint64_t eh_frame_header_size,
std::vector<uintptr_t>* function_starts);