mirror of
https://github.com/jart/cosmopolitan.git
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80b211e314
This change introduces a `-W /dev/pts/1` flag to redbean. What it does is use the mincore() system call to create a dual-screen terminal display that lets you troubleshoot the virtual address space. This is useful since page faults are an important thing to consider when using a forking web server. Now we have a colorful visualization of which pages are going to fault and which ones are resident in memory. The memory monitor, if enabled, spawns as a thread that just outputs ANSI codes to the second terminal in a loop. In order to make this happen using the new clone() polyfill, stdio is now thread safe. This change also introduces some new demo pages to redbean. It also polishes the demos we already have, to look a bit nicer and more presentable for the upcoming release, with better explanations too.
321 lines
11 KiB
C
321 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/internal.h"
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#include "libc/calls/sigbits.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/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/intrin/lockcmpxchg.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/internal.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_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[7];
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struct sigaction g_oldcrashacts[7];
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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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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.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 = __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 %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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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 %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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"\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);
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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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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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__atomic_fetch_sub(&g_ftrace, 1, __ATOMIC_RELAXED);
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__atomic_fetch_sub(&__strace, 1, __ATOMIC_RELAXED);
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if (_lockcmpxchg(&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 (!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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} 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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goto ItsATrap;
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} else if (_lockcmpxchg(¬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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ItsATrap:
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__atomic_fetch_add(&__strace, 1, __ATOMIC_RELAXED);
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__atomic_fetch_add(&g_ftrace, 1, __ATOMIC_RELAXED);
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}
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