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/* Test program for dwarf_next_cfi
Copyright (C) 2018 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 <inttypes.h>
#include ELFUTILS_HEADER(dw)
#include <dwarf.h>
#include <argp.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "system.h"
void
handle_section (char *name, const unsigned char e_ident[],
Elf_Scn *scn, const bool is_eh)
{
if (is_eh)
printf (".eh_frame\n");
else
printf (".debug_frame\n");
GElf_Shdr mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &mem);
if (shdr == NULL)
error (EXIT_FAILURE, 0, "Couldn't get section header: %s",
elf_errmsg (-1));
if ((shdr->sh_flags & SHF_COMPRESSED) != 0)
{
if (elf_compress (scn, 0, 0) < 0)
error (EXIT_FAILURE, 0, "Couldn't decompress section: %s",
elf_errmsg (-1));
}
else if (name[0] == '.' && name[1] == 'z')
{
if (elf_compress_gnu (scn, 0, 0) < 0)
error (EXIT_FAILURE, 0, "Couldn't decompress section: %s",
elf_errmsg (-1));
}
Elf_Data *data = elf_getdata (scn, NULL);
if (data == NULL || data->d_buf == NULL)
error (EXIT_FAILURE, 0, "no section data");
int res;
Dwarf_Off off;
Dwarf_Off next_off = 0;
Dwarf_CFI_Entry entry;
while ((res = dwarf_next_cfi (e_ident, data, is_eh, off = next_off,
&next_off, &entry)) == 0)
{
printf ("[%" PRId64 "] ", off);
if (dwarf_cfi_cie_p (&entry))
printf ("CIE augmentation=\"%s\"\n", entry.cie.augmentation);
else
{
printf ("FDE cie=[%" PRId64 "]\n", entry.fde.CIE_pointer);
Dwarf_Off cie_off = entry.fde.CIE_pointer;
Dwarf_Off cie_off_next;
Dwarf_CFI_Entry cie_entry;
if (dwarf_next_cfi (e_ident, data, is_eh, cie_off, &cie_off_next,
&cie_entry) != 0
|| !dwarf_cfi_cie_p (&cie_entry))
error (EXIT_FAILURE, 0, "FDE doesn't point to CIE");
}
}
if (res < 0)
error (EXIT_FAILURE, 0, "dwarf_next_cfi failed: %s\n",
dwarf_errmsg (-1));
}
int
main (int argc, char *argv[])
{
if (argc != 2)
error (EXIT_FAILURE, 0, "need file name argument");
const char *file = argv[1];
printf ("%s\n", file);
int fd = open (file, O_RDONLY);
if (fd == -1)
error (EXIT_FAILURE, errno, "cannot open input file `%s'", file);
elf_version (EV_CURRENT);
Elf *elf = elf_begin (fd, ELF_C_READ, NULL);
if (elf == NULL)
error (EXIT_FAILURE, 0, "cannot create ELF descriptor: %s",
elf_errmsg (-1));
size_t esize;
const unsigned char *ident = (const unsigned char *) elf_getident (elf,
&esize);
if (ident == NULL || esize < EI_NIDENT)
error (EXIT_FAILURE, 0, "no, or too small, ELF ident");
GElf_Ehdr ehdr;
if (gelf_getehdr (elf, &ehdr) == NULL)
error (EXIT_FAILURE, 0, "cannot get the ELF header: %s\n",
elf_errmsg (-1));
size_t strndx = ehdr.e_shstrndx;
Elf_Scn *scn = NULL;
while ((scn = elf_nextscn (elf, scn)) != NULL)
{
GElf_Shdr shdr;
if (gelf_getshdr (scn, &shdr) != NULL)
{
char *name = elf_strptr (elf, strndx, (size_t) shdr.sh_name);
if (name != NULL && shdr.sh_type == SHT_PROGBITS)
{
if (strcmp (name, ".eh_frame") == 0)
handle_section (name, ident, scn, true);
if (strcmp (name, ".debug_frame") == 0
|| strcmp (name, ".zdebug_frame") == 0)
handle_section (name, ident, scn, false);
}
}
}
elf_end (elf);
close (fd);
return 0;
}
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