mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-18 03:22:40 +00:00
19c81863a3
We're now able to pretty print a C++ backtrace upon crashing in pretty much any runtime execution scenario. The default pledge sandbox policy on Linux is now to return EPERM. If you call pledge and have debugging functions linked (e.g. GetSymbolTable) then the symbol table shall get loaded before any security policy is put in place. This change updates build/bootstrap/fixupobj too and fixes some other sneaky build errors.
103 lines
4.1 KiB
C
103 lines
4.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/cosmo.h"
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#include "libc/fmt/itoa.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/intrin/weaken.h"
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#include "libc/log/backtrace.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/gc.internal.h"
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#include "libc/nexgen32e/stackframe.h"
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#include "libc/runtime/memtrack.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/symbols.internal.h"
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#include "libc/str/str.h"
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#include "libc/thread/thread.h"
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#include "libc/thread/tls.h"
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#define LIMIT 100
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/**
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* Prints stack frames with symbols.
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*
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* PrintBacktraceUsingSymbols(STDOUT_FILENO, NULL, GetSymbolTable());
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*
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* @param f is output stream
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* @param bp is rbp which can be NULL to detect automatically
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* @param st is open symbol table for current executable
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* @return -1 w/ errno if error happened
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*/
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dontinstrument dontasan int PrintBacktraceUsingSymbols(
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int fd, const struct StackFrame *bp, struct SymbolTable *st) {
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size_t gi;
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intptr_t addr;
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const char *name;
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int i, symbol, addend;
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static char cxxbuf[8192];
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struct Garbages *garbage;
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static pthread_spinlock_t lock;
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const struct StackFrame *frame;
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(void)gi;
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if (!bp)
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bp = __builtin_frame_address(0);
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garbage = __tls_enabled ? __get_tls()->tib_garbages : 0;
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gi = garbage ? garbage->i : 0;
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for (i = 0, frame = bp; frame; frame = frame->next) {
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if (kisdangerous(frame)) {
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kprintf("<dangerous frame>\n");
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break;
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}
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if (++i == LIMIT) {
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kprintf("<truncated backtrace>\n");
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break;
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}
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addr = frame->addr;
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#ifdef __x86_64__
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if (gi && addr == (intptr_t)_weaken(__gc)) {
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do {
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--gi;
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} while ((addr = garbage->p[gi].ret) == (intptr_t)_weaken(__gc));
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}
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#endif
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if (addr) {
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if ((symbol = __get_symbol(st, addr)) != -1) {
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addend = addr - st->addr_base;
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addend -= st->symbols[symbol].x;
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} else {
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addend = 0;
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}
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} else {
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symbol = 0;
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addend = 0;
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}
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if ((name = __get_symbol_name(st, symbol)) && __is_mangled(name)) {
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pthread_spin_lock(&lock);
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__demangle(cxxbuf, name, sizeof(cxxbuf));
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kprintf("%012lx %lx %s%+d\n", frame, addr, cxxbuf, addend);
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pthread_spin_unlock(&lock);
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name = cxxbuf;
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} else {
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kprintf("%012lx %lx %s%+d\n", frame, addr, name, addend);
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}
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}
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return 0;
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}
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