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Avoid infinite loop when doing SIGTRAP in arm64-apple #51284

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Merged
merged 2 commits into from
Sep 14, 2023
Merged

Avoid infinite loop when doing SIGTRAP in arm64-apple #51284

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be4f517
Avoid infinite loop when doing SIGTRAP in arm64-apple
gbaraldi Sep 12, 2023
6cb9ebb
Update src/signals-unix.c
gbaraldi Sep 13, 2023
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30 changes: 27 additions & 3 deletions src/signals-unix.c
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Original file line number Diff line number Diff line change
Expand Up @@ -994,6 +994,19 @@ static void sigint_handler(int sig)
jl_sigint_passed = 1;
}

#if defined(_OS_DARWIN_) && defined(_CPU_AARCH64_)
static void sigtrap_handler(int sig, siginfo_t *info, void *context)
{
uintptr_t pc = ((ucontext_t*)context)->uc_mcontext->__ss.__pc; // TODO: Do this in linux as well
uint32_t* code = (uint32_t*)(pc); // https://gcc.gnu.org/legacy-ml/gcc-patches/2013-11/msg02228.html
if (*code == 0xd4200020) { // brk #0x1 which is what LLVM defines as trap
signal(sig, SIG_DFL);
sig = SIGILL; // redefine this as as an "unreachable reached" error message
sigdie_handler(sig, info, context);
}
}
#endif

void jl_install_default_signal_handlers(void)
{
struct sigaction actf;
Expand All @@ -1004,6 +1017,20 @@ void jl_install_default_signal_handlers(void)
if (sigaction(SIGFPE, &actf, NULL) < 0) {
jl_errorf("fatal error: sigaction: %s", strerror(errno));
}
#if defined(_OS_DARWIN_) && defined(_CPU_AARCH64_)
struct sigaction acttrap;
memset(&acttrap, 0, sizeof(struct sigaction));
sigemptyset(&acttrap.sa_mask);
acttrap.sa_sigaction = sigtrap_handler;
acttrap.sa_flags = SA_ONSTACK | SA_SIGINFO;
if (sigaction(SIGTRAP, &acttrap, NULL) < 0) {
jl_errorf("fatal error: sigaction: %s", strerror(errno));
}
#else
if (signal(SIGTRAP, SIG_IGN) == SIG_ERR) {
jl_error("fatal error: Couldn't set SIGTRAP");
}
#endif
struct sigaction actint;
memset(&actint, 0, sizeof(struct sigaction));
sigemptyset(&actint.sa_mask);
Expand All @@ -1015,9 +1042,6 @@ void jl_install_default_signal_handlers(void)
if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
jl_error("fatal error: Couldn't set SIGPIPE");
}
if (signal(SIGTRAP, SIG_IGN) == SIG_ERR) {
jl_error("fatal error: Couldn't set SIGTRAP");
}

#if defined(HAVE_MACH)
allocate_mach_handler();
Expand Down