8d4e028f18
elfutils' libdw is maintained, can read DWARF debug data and appears to be the library of choice for generating backtraces today.
201 lines
5.5 KiB
C
201 lines
5.5 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <dwarf.h>
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#include <elfutils/libdwfl.h>
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#include "util.h"
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#include "macro.h"
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#include "stacktrace.h"
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#define FRAMES_MAX 64
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#define THREADS_MAX 64
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struct stack_context {
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FILE *f;
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Dwfl *dwfl;
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Elf *elf;
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unsigned n_thread;
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unsigned n_frame;
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};
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static int frame_callback(Dwfl_Frame *frame, void *userdata) {
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struct stack_context *c = userdata;
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Dwarf_Addr pc, pc_adjusted, bias = 0;
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_cleanup_free_ Dwarf_Die *scopes = NULL;
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const char *fname = NULL, *symbol = NULL;
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Dwfl_Module *module;
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bool is_activation;
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assert(frame);
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assert(c);
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if (c->n_frame >= FRAMES_MAX)
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return DWARF_CB_ABORT;
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if (!dwfl_frame_pc(frame, &pc, &is_activation))
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return DWARF_CB_ABORT;
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pc_adjusted = pc - (is_activation ? 0 : 1);
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module = dwfl_addrmodule(c->dwfl, pc_adjusted);
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if (module) {
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Dwarf_Die *s, *cudie;
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int n;
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cudie = dwfl_module_addrdie(module, pc_adjusted, &bias);
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if (cudie) {
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n = dwarf_getscopes(cudie, pc_adjusted - bias, &scopes);
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for (s = scopes; s < scopes + n; s++) {
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if (IN_SET(dwarf_tag(s), DW_TAG_subprogram, DW_TAG_inlined_subroutine, DW_TAG_entry_point)) {
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Dwarf_Attribute *a, space;
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a = dwarf_attr_integrate(s, DW_AT_MIPS_linkage_name, &space);
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if (!a)
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a = dwarf_attr_integrate(s, DW_AT_linkage_name, &space);
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if (a)
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symbol = dwarf_formstring(a);
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if (!symbol)
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symbol = dwarf_diename(s);
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if (symbol)
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break;
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}
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}
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}
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if (!symbol)
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symbol = dwfl_module_addrname(module, pc_adjusted);
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fname = dwfl_module_info(module, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
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}
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fprintf(c->f, "#%-2u 0x%016" PRIx64 " %s (%s)\n", c->n_frame, (uint64_t) pc, strna(symbol), strna(fname));
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c->n_frame ++;
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return DWARF_CB_OK;
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}
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static int thread_callback(Dwfl_Thread *thread, void *userdata) {
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struct stack_context *c = userdata;
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pid_t tid;
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assert(thread);
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assert(c);
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if (c->n_thread >= THREADS_MAX)
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return DWARF_CB_ABORT;
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if (c->n_thread != 0)
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fputc('\n', c->f);
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c->n_frame = 0;
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tid = dwfl_thread_tid(thread);
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fprintf(c->f, "Stack trace of thread " PID_FMT ":\n", tid);
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if (dwfl_thread_getframes(thread, frame_callback, c) < 0)
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return DWARF_CB_ABORT;
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c->n_thread ++;
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return DWARF_CB_OK;
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}
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int coredump_make_stack_trace(int fd, const char *executable, char **ret) {
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static const Dwfl_Callbacks callbacks = {
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.find_elf = dwfl_build_id_find_elf,
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.find_debuginfo = dwfl_standard_find_debuginfo,
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};
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struct stack_context c = {};
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char *buf = NULL;
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size_t sz = 0;
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int r;
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assert(fd >= 0);
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assert(ret);
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if (lseek(fd, 0, SEEK_SET) == (off_t) -1)
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return -errno;
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c.f = open_memstream(&buf, &sz);
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if (!c.f)
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return -ENOMEM;
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elf_version(EV_CURRENT);
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c.elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
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if (!c.elf) {
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r = -EINVAL;
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goto finish;
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}
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c.dwfl = dwfl_begin(&callbacks);
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if (!c.dwfl) {
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r = -EINVAL;
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goto finish;
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}
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if (dwfl_core_file_report(c.dwfl, c.elf, executable) < 0) {
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r = -EINVAL;
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goto finish;
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}
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if (dwfl_report_end(c.dwfl, NULL, NULL) != 0) {
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r = -EINVAL;
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goto finish;
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}
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if (dwfl_core_file_attach(c.dwfl, c.elf) < 0) {
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r = -EINVAL;
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goto finish;
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}
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if (dwfl_getthreads(c.dwfl, thread_callback, &c) < 0) {
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r = -EINVAL;
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goto finish;
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}
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fclose(c.f);
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c.f = NULL;
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*ret = buf;
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buf = NULL;
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r = 0;
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finish:
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if (c.dwfl)
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dwfl_end(c.dwfl);
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if (c.elf)
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elf_end(c.elf);
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if (c.f)
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fclose(c.f);
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free(buf);
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return r;
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}
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