mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
550b52abf6
- Introduce epoll_pwait() - Rewrite -ftrapv and ffs() libraries in C code - Use more FreeBSD code in math function library - Get significantly more tests passing on qemu-aarch64 - Fix many Musl long double functions that were broken on AARCH64
69 lines
3.3 KiB
C
69 lines
3.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2022 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/assert.h"
|
|
#include "libc/atomic.h"
|
|
#include "libc/calls/struct/sigaction.h"
|
|
#include "libc/calls/struct/siginfo.h"
|
|
#include "libc/calls/ucontext.h"
|
|
#include "libc/intrin/atomic.h"
|
|
#include "libc/sysv/consts/sa.h"
|
|
#include "libc/sysv/consts/sig.h"
|
|
#include "libc/testlib/testlib.h"
|
|
#include "third_party/xed/x86.h"
|
|
|
|
static volatile _Thread_local int gotsignal;
|
|
|
|
static void ContinueOnError(int sig, siginfo_t *si, void *vctx) {
|
|
struct ucontext *ctx = vctx;
|
|
gotsignal = sig;
|
|
#ifdef __aarch64__
|
|
ctx->uc_mcontext.pc += 4;
|
|
#elif defined(__x86_64__)
|
|
struct XedDecodedInst xedd;
|
|
xed_decoded_inst_zero_set_mode(&xedd, XED_MACHINE_MODE_LONG_64);
|
|
xed_instruction_length_decode(&xedd, (void *)ctx->uc_mcontext.rip, 15);
|
|
ctx->uc_mcontext.rip += xedd.length;
|
|
#else
|
|
#error "unsupported architecture"
|
|
#endif /* __x86_64__ */
|
|
}
|
|
|
|
/**
|
|
* Returns true if byte at address `p` is readable.
|
|
*
|
|
* This function temporarily catches `SIGSEGV` and `SIGBUS` to recover
|
|
* on error. It then attempts a volatile read and if it faults, then
|
|
* this function shall return false. The value at `p` isn't considered.
|
|
*/
|
|
noasan bool testlib_memoryexists(const void *p) {
|
|
volatile char c;
|
|
const atomic_char *mem = p;
|
|
struct sigaction old[2];
|
|
struct sigaction sa = {
|
|
.sa_sigaction = ContinueOnError,
|
|
.sa_flags = SA_SIGINFO,
|
|
};
|
|
gotsignal = 0;
|
|
_npassert(!sigaction(SIGSEGV, &sa, old + 0));
|
|
_npassert(!sigaction(SIGBUS, &sa, old + 1));
|
|
c = atomic_load(mem);
|
|
_npassert(!sigaction(SIGBUS, old + 1, 0));
|
|
_npassert(!sigaction(SIGSEGV, old + 0, 0));
|
|
return !gotsignal;
|
|
}
|