mirror of
https://github.com/jart/cosmopolitan.git
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0cb6b6ff4b
Now that we have understandable system call tracing on Windows, this change rewrites many of the polyfill internals for that platform, to help things get closer to tip top shape. Support for complex forking scenarios had been in a regressed state for quite some time. Now, it works! Subsequent changes should be able to address the performance.
337 lines
11 KiB
C
337 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/bits.h"
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#include "libc/bits/weaken.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/sigbits.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/errno.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/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/libfatal.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/runtime/pc.internal.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_r"); /* for kprintf %m */
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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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/* <SYNC-LIST>: showcrashreports.c, oncrashthunks.S, oncrash.c */
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int kCrashSigs[7];
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struct sigaction g_oldcrashacts[7];
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static const char kCrashSigNames[7][5] forcealign(1) = {
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"QUIT", //
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"FPE", //
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"ILL", //
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"SEGV", //
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"TRAP", //
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"ABRT", //
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"BUS", //
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};
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/* </SYNC-LIST>: showcrashreports.c, oncrashthunks.S, oncrash.c */
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static relegated noinstrument 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(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 if (!ctx->uc_mcontext.rbp) {
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kprintf("%s is NULL can't show backtrace%n", "RBP");
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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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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 = __fixcpy(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 = __uintcpy(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 = __uintcpy(p, x / 1000), *p++ = '.';
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p = __uintcpy(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.gregs[REG_EFL],
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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 = __fixcpy(p, ctx->uc_mcontext.fpregs->xmm[i + 0].u64[1], 64);
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p = __fixcpy(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 = __fixcpy(p, ctx->uc_mcontext.fpregs->xmm[i + 8].u64[1], 64);
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p = __fixcpy(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 SIG%s (%s) on %s pid %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" : "",
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TinyStrSignal(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(), program_invocation_name, names.sysname,
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names.nodename, names.release, names.version);
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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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PrintMemoryIntervals(2, &_mmi);
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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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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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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 SIG%s%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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"%n",
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kind, TinyStrSignal(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);
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quick_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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relegated noinstrument void __oncrash(int sig, struct siginfo *si,
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ucontext_t *ctx) {
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intptr_t rip;
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int gdbpid, err;
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static bool noreentry, notpossible;
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--g_ftrace;
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if (cmpxchg(&noreentry, false, true)) {
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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 (IsLinux() && FindDebugBinary()) {
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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(1);
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ShowCrashReport(err, sig, si, ctx);
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_Exit(128 + sig);
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}
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} else {
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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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++g_ftrace;
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return;
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} else if (cmpxchg(¬possible, false, true)) {
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__minicrash(sig, si, ctx, "WHILE CRASHING");
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} else {
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for (;;) {
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asm("ud2");
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}
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}
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noreentry = false;
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++g_ftrace;
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}
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