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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
71 lines
3.4 KiB
C
71 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/atomic.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/calls/struct/siginfo.h"
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#include "libc/calls/ucontext.h"
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#include "libc/intrin/atomic.h"
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#include "libc/sysv/consts/sa.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/testlib/testlib.h"
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#include "third_party/xed/x86.h"
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static volatile _Thread_local int gotsignal;
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static void ContinueOnError(int sig, siginfo_t *si, void *vctx) {
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struct ucontext *ctx = vctx;
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gotsignal = sig;
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#ifdef __aarch64__
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ctx->uc_mcontext.pc += 4;
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#elif defined(__x86_64__)
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struct XedDecodedInst xedd;
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xed_decoded_inst_zero_set_mode(&xedd, XED_MACHINE_MODE_LONG_64);
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xed_instruction_length_decode(&xedd, (void *)ctx->uc_mcontext.rip, 15);
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ctx->uc_mcontext.rip += xedd.length;
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#else
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#error "unsupported architecture"
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#endif /* __x86_64__ */
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}
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/**
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* Returns true if byte at address `p` is readable.
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*
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* This function temporarily catches `SIGSEGV` and `SIGBUS` to recover
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* on error. It then attempts a volatile read and if it faults, then
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* this function shall return false. The value at `p` isn't considered.
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*/
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dontasan bool testlib_memoryexists(const void *p) {
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volatile char c;
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const atomic_char *mem = p;
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struct sigaction old[2];
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struct sigaction sa = {
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.sa_sigaction = ContinueOnError,
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.sa_flags = SA_SIGINFO,
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};
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gotsignal = 0;
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npassert(!sigaction(SIGSEGV, &sa, old + 0));
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npassert(!sigaction(SIGBUS, &sa, old + 1));
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c = atomic_load(mem);
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(void)c;
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npassert(!sigaction(SIGBUS, old + 1, 0));
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npassert(!sigaction(SIGSEGV, old + 0, 0));
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return !gotsignal;
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}
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