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Avoid crash looping on AARCH64

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This commit is contained in:
Justine Tunney 2024-05-08 01:00:58 -07:00
parent 8f18b3ad65
commit 952b9009e8
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GPG key ID: BE714B4575D6E328
3 changed files with 10 additions and 11 deletions
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15
libc/intrin/feenableexcept.c
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@ -78,17 +78,14 @@ int feenableexcept(int excepts) {
#elif defined(__aarch64__)
unsigned fpcr;
unsigned fpcr2;
unsigned updated_fpcr;
fpcr = __builtin_aarch64_get_fpcr();
fpcr2 = fpcr | (excepts << 8);
unsigned fpcr = __builtin_aarch64_get_fpcr();
unsigned want = excepts << 8;
unsigned fpcr2 = fpcr | want;
if (fpcr != fpcr2) {
__builtin_aarch64_set_fpcr(fpcr2);
// floating point exception trapping is optional in aarch64
updated_fpcr = __builtin_aarch64_get_fpsr();
if (fpcr2 & ~updated_fpcr)
return -1;
fpcr2 = __builtin_aarch64_get_fpsr();
if ((fpcr2 & want) != want)
return -1; // not supported by cpu
}
return (fpcr >> 8) & FE_ALL_EXCEPT;

2
libc/log/oncrash_arm64.c
View file

@ -394,6 +394,8 @@ relegated void __oncrash(int sig, struct siginfo *si, void *arg) {
BLOCK_CANCELATION;
SpinLock(&lock);
__oncrash_impl(sig, si, arg);
if (sig != SIGQUIT && sig != SIGTRAP)
_exit(1);
SpinUnlock(&lock);
ALLOW_CANCELATION;
}

4
libc/runtime/enable_tls.c
View file

@ -68,13 +68,13 @@ static unsigned long ParseMask(const char *str) {
*
* __get_tls()
* │
* %fs Linux/BSDs
* %fs OpenBSD/NetBSD
* _Thread_local │
* ┌───┬──────────┬──────────┼───┐
* │pad│ .tdata │ .tbss │tib│
* └───┴──────────┴──────────┼───┘
* │
* Windows/Mac %gs
* Linux/FreeBSD/Windows/Mac %gs
*
* Here's the TLS memory layout on aarch64:
*