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/* Unwinding of frames like gstack/pstack.
Copyright (C) 2013 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
elfutils 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <assert.h>
#include <argp.h>
#include <error.h>
#include <stdlib.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <locale.h>
#include <fcntl.h>
#include ELFUTILS_HEADER(dwfl)
#include <system.h>
/* Name and version of program. */
static void print_version (FILE *stream, struct argp_state *state);
ARGP_PROGRAM_VERSION_HOOK_DEF = print_version;
/* Bug report address. */
ARGP_PROGRAM_BUG_ADDRESS_DEF = PACKAGE_BUGREPORT;
static bool verbose = false;
static int
frame_callback (Dwfl_Frame *state, void *arg)
{
unsigned *framenop = arg;
Dwarf_Addr pc;
bool isactivation;
if (! dwfl_frame_pc (state, &pc, &isactivation))
{
error (0, 0, "%s", dwfl_errmsg (-1));
return DWARF_CB_ABORT;
}
Dwarf_Addr pc_adjusted = pc - (isactivation ? 0 : 1);
/* Get PC->SYMNAME. */
Dwfl *dwfl = dwfl_thread_dwfl (dwfl_frame_thread (state));
Dwfl_Module *mod = dwfl_addrmodule (dwfl, pc_adjusted);
const char *symname = NULL;
if (mod)
symname = dwfl_module_addrname (mod, pc_adjusted);
// Try to find the address wide if possible.
static int width = 0;
if (width == 0 && mod)
{
Dwarf_Addr bias;
Elf *elf = dwfl_module_getelf (mod, &bias);
if (elf)
{
GElf_Ehdr ehdr_mem;
GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem);
if (ehdr)
width = ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 8 : 16;
}
}
if (width == 0)
width = 16;
printf ("#%-2u 0x%0*" PRIx64, (*framenop)++, width, (uint64_t) pc);
if (verbose)
printf ("%4s", ! isactivation ? "- 1" : "");
printf (" %s\n", symname);
return DWARF_CB_OK;
}
static int
thread_callback (Dwfl_Thread *thread, void *thread_arg __attribute__ ((unused)))
{
printf ("TID %ld:\n", (long) dwfl_thread_tid (thread));
unsigned frameno = 0;
switch (dwfl_thread_getframes (thread, frame_callback, &frameno))
{
case DWARF_CB_OK:
case DWARF_CB_ABORT:
break;
case -1:
error (0, 0, "dwfl_thread_getframes: %s", dwfl_errmsg (-1));
break;
default:
abort ();
}
return DWARF_CB_OK;
}
static void
print_version (FILE *stream, struct argp_state *state __attribute__ ((unused)))
{
fprintf (stream, "stack (%s) %s\n", PACKAGE_NAME, PACKAGE_VERSION);
}
static error_t
parse_opt (int key, char *arg __attribute__ ((unused)),
struct argp_state *state)
{
switch (key)
{
case ARGP_KEY_INIT:
state->child_inputs[0] = state->input;
break;
case 'v':
verbose = true;
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
int
main (int argc, char **argv)
{
/* We use no threads here which can interfere with handling a stream. */
__fsetlocking (stdin, FSETLOCKING_BYCALLER);
__fsetlocking (stdout, FSETLOCKING_BYCALLER);
__fsetlocking (stderr, FSETLOCKING_BYCALLER);
/* Set locale. */
(void) setlocale (LC_ALL, "");
const struct argp_option options[] =
{
{ "verbose", 'v', NULL, 0, N_("Additionally show frames activation"), 0 },
{ NULL, 0, NULL, 0, NULL, 0 }
};
const struct argp_child children[] =
{
{ .argp = dwfl_standard_argp () },
{ .argp = NULL },
};
const struct argp argp =
{
.options = options,
.parser = parse_opt,
.doc = N_("\
Print a stack for each thread in a process or core file.\n\
Only real user processes are supported, no kernel or process maps."),
.children = children
};
int remaining;
Dwfl *dwfl = NULL;
argp_parse (&argp, argc, argv, 0, &remaining, &dwfl);
assert (dwfl != NULL);
if (remaining != argc)
error (2, 0, "eu-stack [--debuginfo-path=<path>] {-p <process id>|"
"--core=<file> [--executable=<file>]|--help}");
/* dwfl_linux_proc_report has been already called from dwfl_standard_argp's
parse_opt function. */
if (dwfl_report_end (dwfl, NULL, NULL) != 0)
error (2, 0, "dwfl_report_end: %s", dwfl_errmsg (-1));
switch (dwfl_getthreads (dwfl, thread_callback, NULL))
{
case DWARF_CB_OK:
break;
case -1:
error (0, 0, "dwfl_getthreads: %s", dwfl_errmsg (-1));
break;
default:
abort ();
}
dwfl_end (dwfl);
return 0;
}
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