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[nce] signal hanlder fixes for sigaction

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Signed-off-by: lizzie <lizzie@eden-emu.dev>
This commit is contained in:
lizzie 2025-09-05 05:12:54 +00:00 • committed by crueter
parent f26cf46a98
commit e087c50fb7
2 changed files with 13 additions and 18 deletions
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22
src/common/signal_chain.cpp
View file

@ -10,27 +10,16 @@
namespace Common {
#ifdef __ANDROID__
template <typename T>
T* LookupLibcSymbol(const char* name) {
#if defined(__BIONIC__)
Common::DynamicLibrary provider("libc.so");
if (!provider.IsOpen()) {
UNREACHABLE_MSG("Failed to open libc!");
}
#else
// For other operating environments, we assume the symbol is not overridden.
const char* base = nullptr;
Common::DynamicLibrary provider(base);
#endif
ASSERT_MSG(provider.IsOpen(), "Failed to open libc!");
void* sym = provider.GetSymbolAddress(name);
if (sym == nullptr) {
sym = dlsym(RTLD_DEFAULT, name);
}
if (sym == nullptr) {
UNREACHABLE_MSG("Unable to find symbol {}!", name);
}
ASSERT_MSG(sym != nullptr, "Unable to find symbol {}!", name);
return reinterpret_cast<T*>(sym);
}
@ -38,5 +27,10 @@ int SigAction(int signum, const struct sigaction* act, struct sigaction* oldact)
static auto libc_sigaction = LookupLibcSymbol<decltype(sigaction)>("sigaction");
return libc_sigaction(signum, act, oldact);
}
#else
int SigAction(int signum, const struct sigaction* act, struct sigaction* oldact) {
return sigaction(signum, act, oldact);
}
#endif
} // namespace Common

9
src/core/arm/nce/arm_nce.s
View file

@ -66,19 +66,20 @@ _ZN4Core6ArmNce37ReturnToRunCodeByExceptionLevelChangeEiPv:
#endif
/* This jumps to the signal handler, which will restore the entire context. */
/* On entry, x0 = thread id, which is already in the right place. Even on macOS. */
/* Move tpidr to x9 so it is not trampled. */
mov x9, x1
mov x9, x1 /* Move tpidr to x9 so it is not trampled. */
mov x1, #(ReturnToRunCodeByExceptionLevelChangeSignal)
#ifdef __APPLE__
/* I can never be happy, why no tkill in mach kernel? Ugh ... */
/* Signature: 328 AUE_PTHREADKILL ALL { int __pthread_kill(int thread_port, int sig); } */
mov x16, #(328)
svc #0x80 /* Tail call the signal handler. */
brk #0xF000 /* See: https://discourse.llvm.org/t/stepping-over-a-brk-instruction-on-arm64/69766/7 */
#else
/* Signature: int tgkill(pid_t tgid, pid_t tid, int sig); */
mov x8, #(__NR_tkill)
svc #0 /* Tail call the signal handler. */
brk #1000 /* Block execution from flowing here. */
#endif
svc #0 /* Tail call the signal handler. */
brk #1000 /* Block execution from flowing here. */
/* static void Core::ArmNce::ReturnToRunCodeByExceptionLevelChangeSignalHandler(int sig, void* info, void* raw_context) */
#ifdef __APPLE__