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[A64] Resolve longjmp targets to existing JIT'd body

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This commit is contained in:
Herman S.
2026-04-22 00:58:54 +09:00
parent c9a6327ad1
commit ba05ea73d6
1 changed files with 47 additions and 0 deletions
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src/xenia/cpu/backend/a64/a64_backend.cc
+47
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@@ -490,6 +490,53 @@ uint64_t ResolveFunction(void* raw_context, uint64_t target_address) {
auto thread_state = guest_context->thread_state;
assert_not_zero(target_address);
// Longjmp re-entry: resume inside an existing function frame instead of
// re-running its prolog. Mirrors x64_emitter.cc::ResolveFunction.
auto* processor = thread_state->processor();
if (cvars::a64_enable_host_guest_stack_synchronization &&
target_address <= 0xFFFFFFFFu) {
auto* module_for_address =
processor->LookupModule(static_cast<uint32_t>(target_address));
auto* xexmod = dynamic_cast<XexModule*>(module_for_address);
if (xexmod) {
InfoCacheFlags* flags = xexmod->GetInstructionAddressFlags(
static_cast<uint32_t>(target_address));
if (flags && flags->is_return_site) {
uintptr_t host_address = 0;
for (auto* entry : processor->FindFunctionsWithAddress(
static_cast<uint32_t>(target_address))) {
auto* afunc = static_cast<A64Function*>(entry);
host_address = afunc->MapGuestAddressToMachineCode(
static_cast<uint32_t>(target_address));
if (host_address &&
afunc->machine_code() !=
reinterpret_cast<const uint8_t*>(host_address)) {
auto* backend = static_cast<A64Backend*>(processor->backend());
auto* backend_context =
backend->BackendContextForGuestContext(guest_context);
if (backend_context->stackpoints &&
backend_context->current_stackpoint_depth > 0) {
uint32_t idx = backend_context->current_stackpoint_depth - 1;
uint32_t guest_sp = static_cast<uint32_t>(guest_context->r[1]);
uint32_t frames_skipped = 0;
while (idx != 0xFFFFFFFFu &&
guest_sp >
backend_context->stackpoints[idx].guest_stack_) {
--idx;
++frames_skipped;
}
// >1 frames skipped = real longjmp, not an early SP restore.
if (frames_skipped > 1) {
return host_address;
}
}
break;
}
}
}
}
}
auto fn = thread_state->processor()->ResolveFunction(
static_cast<uint32_t>(target_address));
if (!fn) {