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/* Test program for DWARF (.debug_frame) CFI handling.
Copyright (C) 2009-2010, 2013, 2015, 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 <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include "system.h"
#include "../libdw/known-dwarf.h"
static const char *
op_name (unsigned int code)
{
static const char *const known[] =
{
#define DWARF_ONE_KNOWN_DW_OP(NAME, CODE) [CODE] = #NAME,
DWARF_ALL_KNOWN_DW_OP
#undef DWARF_ONE_KNOWN_DW_OP
};
if (likely (code < sizeof (known) / sizeof (known[0])))
return known[code];
return NULL;
}
static void
print_detail (int result, const Dwarf_Op *ops, size_t nops)
{
if (result < 0)
printf ("indeterminate (%s)\n", dwarf_errmsg (-1));
else if (nops == 0)
printf ("%s\n", ops == NULL ? "same_value" : "undefined");
else
{
printf ("%s expression:", result == 0 ? "location" : "value");
for (size_t i = 0; i < nops; ++i)
{
printf (" %s", op_name(ops[i].atom));
if (ops[i].number2 == 0)
{
if (ops[i].atom == DW_OP_addr)
printf ("(%#" PRIx64 ")", ops[i].number);
else if (ops[i].number != 0)
printf ("(%" PRId64 ")", ops[i].number);
}
else
printf ("(%" PRId64 ",%" PRId64 ")",
ops[i].number, ops[i].number2);
}
puts ("");
}
}
static int
handle_address (Dwarf_CFI *cfi, GElf_Addr pc)
{
Dwarf_Frame *frame;
int result = dwarf_cfi_addrframe (cfi, pc, &frame);
if (result != 0)
{
printf ("dwarf_cfi_addrframe: %s\n", dwarf_errmsg (-1));
return 1;
}
Dwarf_Addr start = pc;
Dwarf_Addr end = pc;
bool signalp;
int ra_regno = dwarf_frame_info (frame, &start, &end, &signalp);
printf ("%#" PRIx64 " => [%#" PRIx64 ", %#" PRIx64 "):\n",
pc, start, end);
if (ra_regno < 0)
printf ("\treturn address register unavailable (%s)\n",
dwarf_errmsg (-1));
else
printf ("\treturn address in reg%u%s\n",
ra_regno, signalp ? " (signal frame)" : "");
// Point cfa_ops to dummy to match print_detail expectations.
// (nops == 0 && cfa_ops != NULL => "undefined")
Dwarf_Op dummy;
Dwarf_Op *cfa_ops = &dummy;
size_t cfa_nops;
result = dwarf_frame_cfa (frame, &cfa_ops, &cfa_nops);
printf ("\tCFA ");
print_detail (result, cfa_ops, cfa_nops);
// Print the location of the first 10 (DWARF nr) registers
for (int r = 0; r < 10; r++)
{
Dwarf_Op ops_mem[3];
Dwarf_Op *ops;
size_t nops;
printf ("\treg%d: ", r);
int reg_result = dwarf_frame_register (frame, r, ops_mem, &ops, &nops);
print_detail (reg_result, ops, nops);
result |= reg_result;
}
free (frame);
return result;
}
int
main (int argc, char *argv[])
{
if (argc <= 2)
error (EXIT_FAILURE, 0, "need file name argument and addresses");
int fd = open (argv[1], O_RDONLY | O_BINARY);
if (fd == -1)
error (EXIT_FAILURE, errno, "cannot open input file `%s'", argv[1]);
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));
Dwarf *dwarf = dwarf_begin_elf (elf, DWARF_C_READ, NULL);
if (dwarf == NULL)
error (EXIT_FAILURE, 0, "cannot create DWARF descriptor: %s",
dwarf_errmsg (-1));
Dwarf_CFI *cfi = dwarf_getcfi (dwarf);
if (cfi == NULL)
error (EXIT_FAILURE, 0, "cannot get DWARF CFI from .dwarf_frame: %s",
dwarf_errmsg (-1));
int result = 0;
int args = 2;
do
{
char *endp;
uintmax_t addr = strtoumax (argv[args], &endp, 0);
if (endp != argv[args])
result |= handle_address (cfi, addr);
else
result = 1;
}
while (args++ < argc - 1);
dwarf_end (dwarf);
elf_end (elf);
return result;
}
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