mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-17 02:52:40 +00:00
69f4152f38
We had previously not enabled TLS in MODE=tiny in order to keep the smallest example programs (e.g. life.com) just 16kb in size. But it was error prone doing that, so now we just always enable it because this change uses hacks to ensure it won't increase life.com's size. This change also fixes a bug on NetBSD, where signal handlers would break thread local storage if SA_SIGINFO was being used. This looks like it might be a bug in NetBSD, but it's got a simple workaround.
343 lines
11 KiB
C
343 lines
11 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 2020 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/bits/weaken.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/calls/struct/utsname.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/errno.h"
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#include "libc/fmt/itoa.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/intrin/lockcmpxchg.h"
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#include "libc/intrin/lockcmpxchgp.h"
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#include "libc/log/backtrace.internal.h"
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#include "libc/log/gdb.h"
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#include "libc/log/internal.h"
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#include "libc/log/log.h"
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/stackframe.h"
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#include "libc/nexgen32e/threaded.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/pc.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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/**
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* @fileoverview Abnormal termination handling & GUI debugging.
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* @see libc/onkill.c
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*/
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STATIC_YOINK("strerror_wr"); /* for kprintf %m */
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STATIC_YOINK("strsignal"); /* for kprintf %G */
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static const char kGregOrder[17] forcealign(1) = {
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13, 11, 8, 14, 12, 9, 10, 15, 16, 0, 1, 2, 3, 4, 5, 6, 7,
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};
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static const char kGregNames[17][4] forcealign(1) = {
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"R8", "R9", "R10", "R11", "R12", "R13", "R14", "R15", "RDI",
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"RSI", "RBP", "RBX", "RDX", "RAX", "RCX", "RSP", "RIP",
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};
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static const char kCpuFlags[12] forcealign(1) = "CVPRAKZSTIDO";
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static const char kFpuExceptions[6] forcealign(1) = "IDZOUP";
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int kCrashSigs[8];
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relegated static void ShowFunctionCalls(ucontext_t *ctx) {
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struct StackFrame *bp;
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struct StackFrame goodframe;
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if (!ctx->uc_mcontext.rip) {
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kprintf("%s is NULL can't show backtrace\n", "RIP");
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} else {
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goodframe.next = (struct StackFrame *)ctx->uc_mcontext.rbp;
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goodframe.addr = ctx->uc_mcontext.rip;
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bp = &goodframe;
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ShowBacktrace(2, bp);
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}
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}
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relegated static char *AddFlag(char *p, int b, const char *s) {
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if (b) {
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p = stpcpy(p, s);
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} else {
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*p = 0;
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}
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return p;
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}
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relegated static char *DescribeCpuFlags(char *p, int flags, int x87sw,
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int mxcsr) {
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unsigned i;
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for (i = 0; i < ARRAYLEN(kCpuFlags); ++i) {
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if (flags & 1) {
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*p++ = ' ';
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*p++ = kCpuFlags[i];
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*p++ = 'F';
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}
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flags >>= 1;
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}
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for (i = 0; i < ARRAYLEN(kFpuExceptions); ++i) {
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if ((x87sw | mxcsr) & (1 << i)) {
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*p++ = ' ';
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*p++ = kFpuExceptions[i];
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*p++ = 'E';
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}
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}
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p = AddFlag(p, x87sw & FPU_SF, " SF");
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p = AddFlag(p, x87sw & FPU_C0, " C0");
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p = AddFlag(p, x87sw & FPU_C1, " C1");
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p = AddFlag(p, x87sw & FPU_C2, " C2");
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p = AddFlag(p, x87sw & FPU_C3, " C3");
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return p;
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}
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static char *HexCpy(char p[hasatleast 17], uint64_t x, uint8_t k) {
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while (k > 0) *p++ = "0123456789abcdef"[(x >> (k -= 4)) & 15];
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*p = '\0';
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return p;
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}
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relegated static void ShowGeneralRegisters(ucontext_t *ctx) {
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int64_t x;
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const char *s;
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size_t i, j, k;
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long double st;
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char *p, buf[128];
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p = buf;
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kprintf("\n");
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for (i = 0, j = 0, k = 0; i < ARRAYLEN(kGregNames); ++i) {
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if (j > 0) *p++ = ' ';
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if (!(s = kGregNames[(unsigned)kGregOrder[i]])[2]) *p++ = ' ';
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p = stpcpy(p, s), *p++ = ' ';
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p = HexCpy(p, ctx->uc_mcontext.gregs[(unsigned)kGregOrder[i]], 64);
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if (++j == 3) {
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j = 0;
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if (ctx->uc_mcontext.fpregs) {
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memcpy(&st, (char *)&ctx->uc_mcontext.fpregs->st[k], sizeof(st));
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} else {
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bzero(&st, sizeof(st));
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}
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p = stpcpy(p, " ST(");
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p = FormatUint64(p, k++);
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p = stpcpy(p, ") ");
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x = st * 1000;
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if (x < 0) x = -x, *p++ = '-';
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p = FormatUint64(p, x / 1000), *p++ = '.';
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p = FormatUint64(p, x % 1000);
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*p = 0;
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kprintf("%s\n", buf);
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p = buf;
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}
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}
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DescribeCpuFlags(
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p, ctx->uc_mcontext.eflags,
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ctx->uc_mcontext.fpregs ? ctx->uc_mcontext.fpregs->swd : 0,
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ctx->uc_mcontext.fpregs ? ctx->uc_mcontext.fpregs->mxcsr : 0);
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kprintf("%s\n", buf);
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}
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relegated static void ShowSseRegisters(ucontext_t *ctx) {
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size_t i;
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char *p, buf[128];
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if (ctx->uc_mcontext.fpregs) {
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kprintf("\n");
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for (i = 0; i < 8; ++i) {
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p = buf;
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if (i >= 10) {
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*p++ = i / 10 + '0';
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*p++ = i % 10 + '0';
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} else {
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*p++ = i + '0';
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*p++ = ' ';
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}
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*p++ = ' ';
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p = HexCpy(p, ctx->uc_mcontext.fpregs->xmm[i + 0].u64[1], 64);
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p = HexCpy(p, ctx->uc_mcontext.fpregs->xmm[i + 0].u64[0], 64);
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p = stpcpy(p, " XMM");
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if (i + 8 >= 10) {
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*p++ = (i + 8) / 10 + '0';
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*p++ = (i + 8) % 10 + '0';
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} else {
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*p++ = (i + 8) + '0';
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*p++ = ' ';
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}
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*p++ = ' ';
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p = HexCpy(p, ctx->uc_mcontext.fpregs->xmm[i + 8].u64[1], 64);
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p = HexCpy(p, ctx->uc_mcontext.fpregs->xmm[i + 8].u64[0], 64);
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*p = 0;
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kprintf("XMM%s\n", buf);
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}
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}
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}
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void ShowCrashReportHook(int, int, int, struct siginfo *, ucontext_t *);
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relegated void ShowCrashReport(int err, int sig, struct siginfo *si,
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ucontext_t *ctx) {
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int i;
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char *p;
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char host[64];
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struct utsname names;
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static char buf[4096];
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if (weaken(ShowCrashReportHook)) {
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ShowCrashReportHook(2, err, sig, si, ctx);
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}
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names.sysname[0] = 0;
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names.release[0] = 0;
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names.version[0] = 0;
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names.nodename[0] = 0;
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stpcpy(host, "unknown");
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gethostname(host, sizeof(host));
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uname(&names);
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p = buf;
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errno = err;
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kprintf("\n%serror%s: Uncaught %G (%s) on %s pid %d tid %d\n"
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" %s\n"
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" %m\n"
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" %s %s %s %s\n",
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!__nocolor ? "\e[30;101m" : "", !__nocolor ? "\e[0m" : "", sig,
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(ctx && (ctx->uc_mcontext.rsp >= GetStaticStackAddr(0) &&
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ctx->uc_mcontext.rsp <= GetStaticStackAddr(0) + PAGESIZE))
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? "Stack Overflow"
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: GetSiCodeName(sig, si->si_code),
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host, getpid(), gettid(), program_invocation_name, names.sysname,
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names.version, names.nodename, names.release);
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if (ctx) {
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kprintf("\n");
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ShowFunctionCalls(ctx);
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ShowGeneralRegisters(ctx);
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ShowSseRegisters(ctx);
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}
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kprintf("\n");
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__print_maps();
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/* PrintSystemMappings(2); */
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if (__argv) {
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for (i = 0; i < __argc; ++i) {
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if (!__argv[i]) continue;
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if (IsAsan() && !__asan_is_valid(__argv[i], 1)) continue;
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kprintf("%s ", __argv[i]);
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}
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}
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kprintf("\n");
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}
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static wontreturn relegated noinstrument void __minicrash(int sig,
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struct siginfo *si,
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ucontext_t *ctx,
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const char *kind) {
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kprintf("\n"
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"\n"
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"CRASHED %s WITH %G\n"
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"%s\n"
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"RIP %x\n"
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"RSP %x\n"
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"RBP %x\n"
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"PID %d\n"
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"TID %d\n"
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"\n",
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kind, sig, __argv[0], ctx ? ctx->uc_mcontext.rip : 0,
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ctx ? ctx->uc_mcontext.rsp : 0, ctx ? ctx->uc_mcontext.rbp : 0, __pid,
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sys_gettid());
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__restorewintty();
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_Exit(119);
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}
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/**
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* Crashes in a developer-friendly human-centric way.
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*
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* We first try to launch GDB if it's an interactive development
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* session. Otherwise we show a really good crash report, sort of like
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* Python, that includes filenames and line numbers. Many editors, e.g.
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* Emacs, will even recognize its syntax for quick hopping to the
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* failing line. That's only possible if the the .com.dbg file is in the
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* same folder. If the concomitant debug binary can't be found, we
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* simply print addresses which may be cross-referenced using objdump.
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*
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* This function never returns, except for traps w/ human supervision.
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*
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* @threadsafe
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* @vforksafe
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*/
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relegated void __oncrash(int sig, struct siginfo *si, ucontext_t *ctx) {
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intptr_t rip;
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int me, owner;
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int gdbpid, err;
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static int sync;
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static bool notpossible;
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__tls_enabled = false;
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STRACE("__oncrash rip %x", ctx->uc_mcontext.rip);
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--__ftrace;
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--__strace;
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owner = 0;
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me = sys_gettid();
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if (__vforked || _lockcmpxchgp(&sync, &owner, me)) {
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if (!__vforked) {
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rip = ctx ? ctx->uc_mcontext.rip : 0;
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err = errno;
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if ((gdbpid = IsDebuggerPresent(true))) {
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DebugBreak();
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} else if (__nocolor || g_isrunningundermake) {
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gdbpid = -1;
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} else if (!IsTiny() && IsLinux() && FindDebugBinary() && !__isworker) {
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RestoreDefaultCrashSignalHandlers();
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gdbpid = AttachDebugger(
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((sig == SIGTRAP || sig == SIGQUIT) &&
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(rip >= (intptr_t)&_base && rip < (intptr_t)&_etext))
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? rip
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: 0);
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}
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if (!(gdbpid > 0 && (sig == SIGTRAP || sig == SIGQUIT))) {
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__restore_tty();
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ShowCrashReport(err, sig, si, ctx);
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__restorewintty();
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_Exit(128 + sig);
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}
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sync = 0;
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} else {
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sync = 0;
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__minicrash(sig, si, ctx, "WHILE VFORKED");
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}
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} else if (sig == SIGTRAP) {
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// chances are IsDebuggerPresent() confused strace w/ gdb
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goto ItsATrap;
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} else if (owner == me) {
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// we crashed while generating a crash report
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if (_lockcmpxchg(¬possible, false, true)) {
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__minicrash(sig, si, ctx, "WHILE CRASHING");
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} else {
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// somehow __minicrash() crashed not possible
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for (;;) {
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asm("ud2");
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}
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}
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} else {
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// multiple threads have crashed
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// kill current thread assuming process dies soon
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// TODO(jart): It'd be nice to report on all threads.
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_Exit1(8);
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}
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ItsATrap:
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++__strace;
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++__ftrace;
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}
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