101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/**************************************************************************/
|
|
/* */
|
|
/* OCaml */
|
|
/* */
|
|
/* Mehdi Dogguy, PPS laboratory, University Paris Diderot */
|
|
/* */
|
|
/* Copyright 2010 Mehdi Dogguy */
|
|
/* */
|
|
/* All rights reserved. This file is distributed under the terms of */
|
|
/* the GNU Lesser General Public License version 2.1, with the */
|
|
/* special exception on linking described in the file LICENSE. */
|
|
/* */
|
|
/**************************************************************************/
|
|
|
|
#include "caml/s.h"
|
|
#include <stdio.h>
|
|
|
|
#ifdef HAS_LIBBFD
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
// PACKAGE: protect against binutils change
|
|
// https://sourceware.org/bugzilla/show_bug.cgi?id=14243
|
|
#define PACKAGE "ocamlobjinfo"
|
|
#include <bfd.h>
|
|
#undef PACKAGE
|
|
|
|
#define plugin_header_sym (symbol_prefix "caml_plugin_header")
|
|
|
|
int main(int argc, char ** argv)
|
|
{
|
|
bfd *fd;
|
|
asection *sec;
|
|
file_ptr offset;
|
|
long st_size;
|
|
asymbol ** symbol_table;
|
|
long sym_count, i;
|
|
|
|
if (argc != 2) {
|
|
fprintf(stderr, "Usage: objinfo_helper <dynamic library>\n");
|
|
return 2;
|
|
}
|
|
|
|
fd = bfd_openr(argv[1], "default");
|
|
if (!fd) {
|
|
fprintf(stderr, "Error opening file %s\n", argv[1]);
|
|
return 2;
|
|
}
|
|
if (! bfd_check_format (fd, bfd_object)) {
|
|
fprintf(stderr, "Error: wrong format\n");
|
|
bfd_close(fd);
|
|
return 2;
|
|
}
|
|
|
|
sec = bfd_get_section_by_name(fd, ".data");
|
|
if (! sec) {
|
|
fprintf(stderr, "Error: section .data not found\n");
|
|
bfd_close(fd);
|
|
return 2;
|
|
}
|
|
|
|
offset = sec->filepos;
|
|
st_size = bfd_get_dynamic_symtab_upper_bound (fd);
|
|
if (st_size <= 0) {
|
|
fprintf(stderr, "Error: size of section .data unknown\n");
|
|
bfd_close(fd);
|
|
return 2;
|
|
}
|
|
|
|
symbol_table = malloc(st_size);
|
|
if (! symbol_table) {
|
|
fprintf(stderr, "Error: out of memory\n");
|
|
bfd_close(fd);
|
|
return 2;
|
|
}
|
|
|
|
sym_count = bfd_canonicalize_dynamic_symtab (fd, symbol_table);
|
|
|
|
for (i = 0; i < sym_count; i++) {
|
|
if (strcmp(symbol_table[i]->name, plugin_header_sym) == 0) {
|
|
printf("%ld\n", (long) (offset + symbol_table[i]->value));
|
|
bfd_close(fd);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
fprintf(stderr, "Error: missing symbol %s\n", plugin_header_sym);
|
|
bfd_close(fd);
|
|
return 2;
|
|
}
|
|
|
|
#else
|
|
|
|
int main(int argc, char ** argv)
|
|
{
|
|
fprintf(stderr,"BFD library unavailable, cannot print info on .cmxs files\n");
|
|
return 2;
|
|
}
|
|
|
|
#endif
|