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https://github.com/jart/cosmopolitan.git
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4631d34d0d
It's now possible to use sigaltstack() to recover from stack overflows on Windows. Several bugs in sigaltstack() have been fixed, for all our supported platforms. There's a newer better example showing how to use this, along with three independent unit tests just to further showcase the various techniques.
45 lines
2.4 KiB
C
45 lines
2.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net 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/intrin/describebacktrace.internal.h"
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#include "libc/log/libfatal.internal.h"
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#include "libc/nexgen32e/stackframe.h"
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#define N 100
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dontinstrument const char *(DescribeBacktrace)(char buf[N],
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struct StackFrame *fr) {
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char *p = buf;
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char *pe = p + N;
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bool gotsome = false;
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while (fr) {
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if (p + 16 + 1 + 1 <= pe) {
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if (gotsome) {
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*p++ = ' ';
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} else {
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gotsome = true;
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}
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p = __hexcpy(p, fr->addr);
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} else {
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break;
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}
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fr = fr->next;
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}
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*p = 0;
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return buf;
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}
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