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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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33
libc/calls/wincrash.c
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@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/internal.h"
#include "libc/calls/sig.internal.h"
#include "libc/calls/strace.internal.h"
#include "libc/calls/typedef/sigaction_f.h"
#include "libc/calls/ucontext.h"
@ -24,14 +25,14 @@
#include "libc/nt/enum/signal.h"
#include "libc/nt/struct/ntexceptionpointers.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/sa.h"
#include "libc/sysv/consts/sicode.h"
#include "libc/sysv/consts/sig.h"
textwindows unsigned __wincrash(struct NtExceptionPointers *ep) {
int sig, rva, code;
struct Goodies {
ucontext_t ctx;
struct siginfo si;
} g;
int64_t rip;
int sig, code;
ucontext_t ctx;
STRACE("__wincrash");
switch (ep->ExceptionRecord->ExceptionCode) {
case kNtSignalBreakpoint:
@ -96,12 +97,22 @@ textwindows unsigned __wincrash(struct NtExceptionPointers *ep) {
default:
return kNtExceptionContinueSearch;
}
bzero(&g, sizeof(g));
g.si.si_code = code;
rva = __sighandrvas[sig];
if (rva >= kSigactionMinRva) {
ntcontext2linux(&g.ctx, ep->ContextRecord);
((sigaction_f)(_base + rva))(sig, &g.si, &g.ctx);
rip = ep->ContextRecord->Rip;
if (__sighandflags[sig] & SA_SIGINFO) {
_ntcontext2linux(&ctx, ep->ContextRecord);
__sig_handle(false, sig, code, &ctx);
_ntlinux2context(ep->ContextRecord, &ctx);
} else {
__sig_handle(false, sig, code, 0);
}
// Windows seems to be the only operating system that traps INT3 at
// addressof(INT3) rather than addressof(INT3)+1. So we must adjust
// RIP to prevent the same INT3 from being trapped forevermore.
if (sig == SIGTRAP && rip == ep->ContextRecord->Rip) {
ep->ContextRecord->Rip++;
}
return kNtExceptionContinueExecution;
}