228 lines
8.0 KiB
C
228 lines
8.0 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/sigbits.h"
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#include "libc/calls/struct/utsname.h"
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#include "libc/calls/ucontext.h"
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#include "libc/dce.h"
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#include "libc/fmt/fmt.h"
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#include "libc/log/backtrace.h"
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#include "libc/log/color.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.h"
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#include "libc/nexgen32e/stackframe.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/memtrack.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/auxv.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/sig.h"
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STATIC_YOINK("ftoa");
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STATIC_YOINK("ntoa");
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STATIC_YOINK("stoa");
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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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struct siginfo;
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static const char kGregOrder[17] aligned(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] aligned(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 kGodHatesFlags[12] aligned(1) = "CVPRAKZSTIDO";
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static const char kCrashSigNames[8][5] aligned(1) = {
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"QUIT", "FPE", "ILL", "SEGV", "TRAP", "ABRT", "BUS"};
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int kCrashSigs[8];
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struct sigaction g_oldcrashacts[8];
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relegated static const char *TinyStrSignal(int sig) {
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size_t i;
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for (i = 0; i < ARRAYLEN(kCrashSigs); ++i) {
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if (kCrashSigs[i] && sig == kCrashSigs[i]) {
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return kCrashSigNames[i];
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}
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}
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return "???";
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}
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relegated static void ShowFunctionCalls(int fd, ucontext_t *ctx) {
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struct StackFrame *bp;
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struct StackFrame goodframe;
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write(fd, "\r\n", 2);
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if (ctx && ctx->uc_mcontext.rip && ctx->uc_mcontext.rbp) {
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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(fd, bp);
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}
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}
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relegated static void DescribeCpuFlags(int fd, unsigned flags) {
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unsigned i;
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char buf[64], *p;
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p = buf;
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for (i = 0; i < ARRAYLEN(kGodHatesFlags); ++i) {
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if (flags & 1) {
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*p++ = ' ';
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*p++ = kGodHatesFlags[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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p = stpcpy(p, " IOPL");
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*p++ = '0' + (flags & 3);
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write(fd, buf, p - buf);
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}
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relegated static void ShowGeneralRegisters(int fd, ucontext_t *ctx) {
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size_t i, j, k;
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long double st;
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write(fd, "\r\n", 2);
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for (i = 0, j = 0, k = 0; i < ARRAYLEN(kGregNames); ++i) {
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if (j > 0) write(fd, " ", 1);
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(dprintf)(fd, "%-3s %016lx", kGregNames[(unsigned)kGregOrder[i]],
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ctx->uc_mcontext.gregs[(unsigned)kGregOrder[i]]);
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if (++j == 3) {
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j = 0;
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memcpy(&st, (char *)&ctx->fpustate.st[k], sizeof(st));
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(dprintf)(fd, " %s(%zu) %Lf", "ST", k, st);
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++k;
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write(fd, "\r\n", 2);
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}
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}
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DescribeCpuFlags(fd, ctx->uc_mcontext.gregs[REG_EFL]);
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}
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relegated static void ShowSseRegisters(int fd, ucontext_t *ctx) {
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size_t i;
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write(fd, "\r\n", 2);
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for (i = 0; i < 8; ++i) {
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(dprintf)(fd, VEIL("r", "%s%-2zu %016lx%016lx %s%-2d %016lx%016lx\r\n"),
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"XMM", i + 0, ctx->fpustate.xmm[i + 0].u64[0],
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ctx->fpustate.xmm[i + 0].u64[1], "XMM", i + 8,
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ctx->fpustate.xmm[i + 8].u64[0], ctx->fpustate.xmm[i + 8].u64[1]);
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}
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}
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relegated static void ShowMemoryMappings(int outfd) {
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ssize_t rc;
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int c, infd;
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char buf[64];
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if (!IsTiny()) {
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PrintMemoryIntervals(outfd, &_mmi);
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if ((infd = open("/proc/self/maps", O_RDONLY)) != -1) {
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while ((rc = read(infd, buf, sizeof(buf))) > 0) {
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write(outfd, buf, rc);
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}
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}
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close(infd);
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}
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}
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relegated static void ShowCrashReport(int err, int fd, int sig,
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ucontext_t *ctx) {
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int i;
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struct utsname names;
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(dprintf)(fd, VEIL("r", "\r\n%serror%s: Uncaught SIG%s\r\n %s\r\n %s\r\n"),
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RED2, RESET, TinyStrSignal(sig), getauxval(AT_EXECFN),
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strerror(err));
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if (uname(&names) != -1) {
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(dprintf)(fd, VEIL("r", " %s %s %s %s\r\n"), names.sysname, names.nodename,
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names.release, names.version);
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}
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ShowFunctionCalls(fd, ctx);
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if (ctx) {
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ShowGeneralRegisters(fd, ctx);
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ShowSseRegisters(fd, ctx);
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}
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write(fd, "\r\n", 2);
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ShowMemoryMappings(fd);
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write(fd, "\r\n", 2);
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for (i = 0; i < g_argc; ++i) {
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write(fd, g_argv[i], strlen(g_argv[i]));
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write(fd, "\r\n", 2);
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}
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}
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relegated static void RestoreDefaultCrashSignalHandlers(void) {
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size_t i;
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sigset_t ss;
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sigemptyset(&ss);
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sigprocmask(SIG_SETMASK, &ss, NULL);
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for (i = 0; i < ARRAYLEN(kCrashSigs); ++i) {
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if (kCrashSigs[i]) sigaction(kCrashSigs[i], &g_oldcrashacts[i], NULL);
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}
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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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relegated void __oncrash(int sig, struct siginfo *si, ucontext_t *ctx) {
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intptr_t rip;
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int gdbpid, err;
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static bool once;
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err = errno;
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if (once) abort();
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once = true;
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/* TODO(jart): Needs translation for ucontext_t and possibly siginfo_t. */
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if (IsFreebsd() || IsOpenbsd()) ctx = NULL;
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rip = ctx ? ctx->uc_mcontext.rip : 0;
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if ((gdbpid = IsDebuggerPresent(true))) {
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DebugBreak();
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} else if (isterminalinarticulate() || isrunningundermake()) {
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gdbpid = -1;
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} else {
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RestoreDefaultCrashSignalHandlers();
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gdbpid =
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attachdebugger(((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)) return;
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ShowCrashReport(err, STDERR_FILENO, sig, ctx);
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exit(128 + sig);
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unreachable;
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}
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