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[ARM64] Initial commit for arm64 backend

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Based entirely off existing xbyak x86 implementation and available
tests. Still needs a lot of optimization and testing on non-Windows
platforms.

So far passes all tests and boots at least some games on Windows.
This commit is contained in:
Herman S.
2026-03-21 01:17:18 +09:00
parent c6e112bcd8
commit 883c2030d0
44 changed files with 13428 additions and 140 deletions
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79
src/xenia/base/exception_handler_win.cc
View File

@@ -29,6 +29,57 @@ constexpr size_t kMaxHandlerCount = 8;
// Executed in order.
std::pair<ExceptionHandler::Handler, void*> handlers_[kMaxHandlerCount];
static void CaptureThreadContext(HostThreadContext& thread_context,
PCONTEXT ctx) {
#if XE_ARCH_AMD64
thread_context.rip = ctx->Rip;
thread_context.eflags = ctx->EFlags;
std::memcpy(thread_context.int_registers, &ctx->Rax,
sizeof(thread_context.int_registers));
std::memcpy(thread_context.xmm_registers, &ctx->Xmm0,
sizeof(thread_context.xmm_registers));
#elif XE_ARCH_ARM64
thread_context.pc = ctx->Pc;
thread_context.pstate = ctx->Cpsr;
thread_context.sp = ctx->Sp;
std::memcpy(thread_context.x, &ctx->X0, sizeof(thread_context.x));
std::memcpy(thread_context.v, &ctx->V[0], sizeof(thread_context.v));
#endif
}
static void RestoreThreadContext(PCONTEXT ctx,
const HostThreadContext& thread_context,
const Exception& ex) {
#if XE_ARCH_AMD64
ctx->Rip = thread_context.rip;
ctx->EFlags = thread_context.eflags;
uint32_t modified_register_index;
uint16_t modified_int_registers_remaining = ex.modified_int_registers();
while (xe::bit_scan_forward(modified_int_registers_remaining,
&modified_register_index)) {
modified_int_registers_remaining &=
~(UINT16_C(1) << modified_register_index);
(&ctx->Rax)[modified_register_index] =
thread_context.int_registers[modified_register_index];
}
uint16_t modified_xmm_registers_remaining = ex.modified_xmm_registers();
while (xe::bit_scan_forward(modified_xmm_registers_remaining,
&modified_register_index)) {
modified_xmm_registers_remaining &=
~(UINT16_C(1) << modified_register_index);
std::memcpy(&ctx->Xmm0 + modified_register_index,
&thread_context.xmm_registers[modified_register_index],
sizeof(vec128_t));
}
#elif XE_ARCH_ARM64
ctx->Pc = thread_context.pc;
ctx->Cpsr = thread_context.pstate;
ctx->Sp = thread_context.sp;
std::memcpy(&ctx->X0, thread_context.x, sizeof(thread_context.x));
std::memcpy(&ctx->V[0], thread_context.v, sizeof(thread_context.v));
#endif
}
LONG CALLBACK ExceptionHandlerCallback(PEXCEPTION_POINTERS ex_info) {
// Visual Studio SetThreadName.
if (ex_info->ExceptionRecord->ExceptionCode == 0x406D1388) {
@@ -36,12 +87,7 @@ LONG CALLBACK ExceptionHandlerCallback(PEXCEPTION_POINTERS ex_info) {
}
HostThreadContext thread_context;
thread_context.rip = ex_info->ContextRecord->Rip;
thread_context.eflags = ex_info->ContextRecord->EFlags;
std::memcpy(thread_context.int_registers, &ex_info->ContextRecord->Rax,
sizeof(thread_context.int_registers));
std::memcpy(thread_context.xmm_registers, &ex_info->ContextRecord->Xmm0,
sizeof(thread_context.xmm_registers));
CaptureThreadContext(thread_context, ex_info->ContextRecord);
// https://msdn.microsoft.com/en-us/library/ms679331(v=vs.85).aspx
// https://msdn.microsoft.com/en-us/library/aa363082(v=vs.85).aspx
@@ -78,26 +124,7 @@ LONG CALLBACK ExceptionHandlerCallback(PEXCEPTION_POINTERS ex_info) {
for (size_t i = 0; i < xe::countof(handlers_) && handlers_[i].first; ++i) {
if (handlers_[i].first(&ex, handlers_[i].second)) {
// Exception handled.
ex_info->ContextRecord->Rip = thread_context.rip;
ex_info->ContextRecord->EFlags = thread_context.eflags;
uint32_t modified_register_index;
uint16_t modified_int_registers_remaining = ex.modified_int_registers();
while (xe::bit_scan_forward(modified_int_registers_remaining,
&modified_register_index)) {
modified_int_registers_remaining &=
~(UINT16_C(1) << modified_register_index);
(&ex_info->ContextRecord->Rax)[modified_register_index] =
thread_context.int_registers[modified_register_index];
}
uint16_t modified_xmm_registers_remaining = ex.modified_xmm_registers();
while (xe::bit_scan_forward(modified_xmm_registers_remaining,
&modified_register_index)) {
modified_xmm_registers_remaining &=
~(UINT16_C(1) << modified_register_index);
std::memcpy(&ex_info->ContextRecord->Xmm0 + modified_register_index,
&thread_context.xmm_registers[modified_register_index],
sizeof(vec128_t));
}
RestoreThreadContext(ex_info->ContextRecord, thread_context, ex);
return EXCEPTION_CONTINUE_EXECUTION;
}
}