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Improve locks and signals

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- Introduce fast spinlock API
- Double rand64() perf w/ spinlock
- Improve raise() on New Technology
- Support gettid() across platforms
- Implement SA_NODEFER on New Technology
- Move the lock intrinsics into LIBC_INTRIN
- Make SIGTRAP recoverable on New Technology
- Block SIGCHLD in wait4() on New Technology
- Add threading prototypes for XNU and FreeBSD
- Rewrite abort() fixing its minor bugs on XNU/NT
- Shave down a lot of the content in libc/bits/bits.h
- Let signal handlers modify CPU registers on New Technology
This commit is contained in:
Justine Tunney 2022-04-12 05:20:17 -07:00
parent f68f1789bd
commit 046c7ebd4a
110 changed files with 1514 additions and 876 deletions
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12
libc/intrin/asan.c
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@ -18,7 +18,6 @@
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/alg/reverse.internal.h"
#include "libc/assert.h"
#include "libc/bits/bits.h"
#include "libc/bits/likely.h"
#include "libc/bits/weaken.h"
#include "libc/calls/calls.h"
@ -29,6 +28,7 @@
#include "libc/intrin/asan.internal.h"
#include "libc/intrin/asancodes.h"
#include "libc/intrin/kprintf.h"
#include "libc/intrin/lockcmpxchg.h"
#include "libc/log/backtrace.internal.h"
#include "libc/log/internal.h"
#include "libc/log/libfatal.internal.h"
@ -842,7 +842,7 @@ void *__asan_morgue_add(void *p) {
for (;;) {
i = __asan_morgue.i;
j = (i + 1) & (ARRAYLEN(__asan_morgue.p) - 1);
if (cmpxchg(&__asan_morgue.i, i, j)) {
if (_lockcmpxchg(&__asan_morgue.i, i, j)) {
r = __asan_morgue.p[i];
__asan_morgue.p[i] = p;
return r;
@ -855,7 +855,7 @@ static void __asan_morgue_flush(void) {
void *p;
for (i = 0; i < ARRAYLEN(__asan_morgue.p); ++i) {
p = __asan_morgue.p[i];
if (cmpxchg(__asan_morgue.p + i, p, 0)) {
if (_lockcmpxchg(__asan_morgue.p + i, p, 0)) {
if (weaken(dlfree)) {
weaken(dlfree)(p);
}
@ -1206,7 +1206,7 @@ void __asan_evil(uint8_t *addr, int size, const char *s1, const char *s2) {
}
void __asan_report_load(uint8_t *addr, int size) {
if (cmpxchg(&__asan_noreentry, false, true)) {
if (_lockcmpxchg(&__asan_noreentry, false, true)) {
if (!__vforked) {
__asan_report_memory_fault(addr, size, "load")();
__asan_unreachable();
@ -1219,7 +1219,7 @@ void __asan_report_load(uint8_t *addr, int size) {
}
void __asan_report_store(uint8_t *addr, int size) {
if (cmpxchg(&__asan_noreentry, false, true)) {
if (_lockcmpxchg(&__asan_noreentry, false, true)) {
if (!__vforked) {
__asan_report_memory_fault(addr, size, "store")();
__asan_unreachable();
@ -1364,7 +1364,7 @@ static textstartup void __asan_shadow_existing_mappings(void) {
textstartup void __asan_init(int argc, char **argv, char **envp,
intptr_t *auxv) {
static bool once;
if (!cmpxchg(&once, false, true)) return;
if (!_lockcmpxchg(&once, false, true)) return;
if (IsWindows() && NtGetVersion() < kNtVersionWindows10) {
__write_str("error: asan binaries require windows10\r\n");
__restorewintty();