+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2014 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <dwarf.h>
-#include <elfutils/libdwfl.h>
-
-#include "util.h"
-#include "macro.h"
-#include "stacktrace.h"
-
-#define FRAMES_MAX 64
-#define THREADS_MAX 64
-
-struct stack_context {
- FILE *f;
- Dwfl *dwfl;
- Elf *elf;
- unsigned n_thread;
- unsigned n_frame;
-};
-
-static int frame_callback(Dwfl_Frame *frame, void *userdata) {
- struct stack_context *c = userdata;
- Dwarf_Addr pc, pc_adjusted, bias = 0;
- _cleanup_free_ Dwarf_Die *scopes = NULL;
- const char *fname = NULL, *symbol = NULL;
- Dwfl_Module *module;
- bool is_activation;
-
- assert(frame);
- assert(c);
-
- if (c->n_frame >= FRAMES_MAX)
- return DWARF_CB_ABORT;
-
- if (!dwfl_frame_pc(frame, &pc, &is_activation))
- return DWARF_CB_ABORT;
-
- pc_adjusted = pc - (is_activation ? 0 : 1);
-
- module = dwfl_addrmodule(c->dwfl, pc_adjusted);
- if (module) {
- Dwarf_Die *s, *cudie;
- int n;
-
- cudie = dwfl_module_addrdie(module, pc_adjusted, &bias);
- if (cudie) {
- n = dwarf_getscopes(cudie, pc_adjusted - bias, &scopes);
- for (s = scopes; s < scopes + n; s++) {
- if (IN_SET(dwarf_tag(s), DW_TAG_subprogram, DW_TAG_inlined_subroutine, DW_TAG_entry_point)) {
- Dwarf_Attribute *a, space;
-
- a = dwarf_attr_integrate(s, DW_AT_MIPS_linkage_name, &space);
- if (!a)
- a = dwarf_attr_integrate(s, DW_AT_linkage_name, &space);
- if (a)
- symbol = dwarf_formstring(a);
- if (!symbol)
- symbol = dwarf_diename(s);
-
- if (symbol)
- break;
- }
- }
- }
-
- if (!symbol)
- symbol = dwfl_module_addrname(module, pc_adjusted);
-
- fname = dwfl_module_info(module, NULL, NULL, NULL, NULL, NULL, NULL, NULL);
- }
-
- fprintf(c->f, "#%-2u 0x%016" PRIx64 " %s (%s)\n", c->n_frame, (uint64_t) pc, strna(symbol), strna(fname));
- c->n_frame ++;
-
- return DWARF_CB_OK;
-}
-
-static int thread_callback(Dwfl_Thread *thread, void *userdata) {
- struct stack_context *c = userdata;
- pid_t tid;
-
- assert(thread);
- assert(c);
-
- if (c->n_thread >= THREADS_MAX)
- return DWARF_CB_ABORT;
-
- if (c->n_thread != 0)
- fputc('\n', c->f);
-
- c->n_frame = 0;
-
- tid = dwfl_thread_tid(thread);
- fprintf(c->f, "Stack trace of thread " PID_FMT ":\n", tid);
-
- if (dwfl_thread_getframes(thread, frame_callback, c) < 0)
- return DWARF_CB_ABORT;
-
- c->n_thread ++;
-
- return DWARF_CB_OK;
-}
-
-int coredump_make_stack_trace(int fd, const char *executable, char **ret) {
-
- static const Dwfl_Callbacks callbacks = {
- .find_elf = dwfl_build_id_find_elf,
- .find_debuginfo = dwfl_standard_find_debuginfo,
- };
-
- struct stack_context c = {};
- char *buf = NULL;
- size_t sz = 0;
- int r;
-
- assert(fd >= 0);
- assert(ret);
-
- if (lseek(fd, 0, SEEK_SET) == (off_t) -1)
- return -errno;
-
- c.f = open_memstream(&buf, &sz);
- if (!c.f)
- return -ENOMEM;
-
- elf_version(EV_CURRENT);
-
- c.elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
- if (!c.elf) {
- r = -EINVAL;
- goto finish;
- }
-
- c.dwfl = dwfl_begin(&callbacks);
- if (!c.dwfl) {
- r = -EINVAL;
- goto finish;
- }
-
- if (dwfl_core_file_report(c.dwfl, c.elf, executable) < 0) {
- r = -EINVAL;
- goto finish;
- }
-
- if (dwfl_report_end(c.dwfl, NULL, NULL) != 0) {
- r = -EINVAL;
- goto finish;
- }
-
- if (dwfl_core_file_attach(c.dwfl, c.elf) < 0) {
- r = -EINVAL;
- goto finish;
- }
-
- if (dwfl_getthreads(c.dwfl, thread_callback, &c) < 0) {
- r = -EINVAL;
- goto finish;
- }
-
- fclose(c.f);
- c.f = NULL;
-
- *ret = buf;
- buf = NULL;
-
- r = 0;
-
-finish:
- if (c.dwfl)
- dwfl_end(c.dwfl);
-
- if (c.elf)
- elf_end(c.elf);
-
- if (c.f)
- fclose(c.f);
-
- free(buf);
-
- return r;
-}
~ianmdlvl / elogind.git / blobdiff