877 lines
24 KiB
C
877 lines
24 KiB
C
/* nlmconv.c -- NLM conversion program
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Copyright (C) 1993 Free Software Foundation, Inc.
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This file is part of GNU Binutils.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* Written by Ian Lance Taylor <ian@cygnus.com>.
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This program can be used to convert any appropriate object file
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into a NetWare Loadable Module (an NLM). It will accept a linker
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specification file which is identical to that accepted by the
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NetWare linker, NLMLINK, except that the INPUT command, normally
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used to give a list of object files to link together, is not used.
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This program will convert only a single object file. */
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#include <ansidecl.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <getopt.h>
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#include <bfd.h>
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#include "sysdep.h"
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#include "bucomm.h"
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/* Internal BFD NLM header. */
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#include "libnlm.h"
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#include "nlmconv.h"
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/* If strerror is just a macro, we want to use the one from libiberty
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since it will handle undefined values. */
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#undef strerror
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extern char *strerror ();
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/* Global variables. */
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/* The name used to invoke the program. */
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char *program_name;
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/* The version number. */
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extern char *program_version;
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/* The symbols table. */
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static asymbol **symbols;
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/* Local variables. */
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/* The list of long options. */
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static struct option long_options[] =
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{
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{ "header-info", required_argument, 0, 'T' },
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{ "help", no_argument, 0, 'H' },
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{ "input-format", required_argument, 0, 'I' },
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{ "output-format", required_argument, 0, 'O' },
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{ "version", no_argument, 0, 'v' },
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{ NULL, no_argument, 0, 0 }
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};
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/* Local routines. */
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static void show_help PARAMS ((void));
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static void show_usage PARAMS ((FILE *, int));
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static const char *select_output_format PARAMS ((enum bfd_architecture,
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long, boolean));
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static void setup_sections PARAMS ((bfd *, asection *, PTR));
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static void copy_sections PARAMS ((bfd *, asection *, PTR));
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static void mangle_relocs PARAMS ((bfd *, arelent **,
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bfd_size_type, char *,
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bfd_size_type));
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static void i386_mangle_relocs PARAMS ((bfd *, arelent **, bfd_size_type,
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char *, bfd_size_type));
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/* The main routine. */
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int
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main (argc, argv)
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int argc;
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char **argv;
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{
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int opt;
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const char *input_format = NULL;
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const char *output_format = NULL;
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const char *header_file = NULL;
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bfd *inbfd;
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bfd *outbfd;
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unsigned int symcount;
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unsigned int i;
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char inlead, outlead;
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boolean gotstart, gotexit, gotcheck;
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struct stat st;
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FILE *custom_data, *help_data, *message_data, *rpc_data;
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bfd_size_type custom_size, help_size, message_size, module_size, rpc_size;
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asection *custom_section, *help_section, *message_section, *module_section;
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asection *rpc_section;
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int len;
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program_name = argv[0];
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bfd_init ();
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while ((opt = getopt_long (argc, argv, "HI:O:T:v", long_options, (int *) 0))
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!= EOF)
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{
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switch (opt)
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{
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case 'H':
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show_help ();
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/*NOTREACHED*/
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case 'I':
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input_format = optarg;
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break;
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case 'O':
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output_format = optarg;
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break;
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case 'T':
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header_file = optarg;
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break;
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case 'v':
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printf ("GNU %s version %s\n", program_name, program_version);
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exit (0);
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/*NOTREACHED*/
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case 0:
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break;
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default:
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show_usage (stderr, 1);
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/*NOTREACHED*/
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}
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}
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if (optind + 2 != argc)
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show_usage (stderr, 1);
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if (strcmp (argv[optind], argv[optind + 1]) == 0)
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{
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fprintf (stderr, "%s: input and output files must be different\n",
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program_name);
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exit (1);
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}
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inbfd = bfd_openr (argv[optind], input_format);
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if (inbfd == NULL)
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bfd_fatal (argv[optind]);
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if (! bfd_check_format (inbfd, bfd_object))
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bfd_fatal (argv[optind]);
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if (output_format == NULL)
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output_format = select_output_format (bfd_get_arch (inbfd),
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bfd_get_mach (inbfd),
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inbfd->xvec->byteorder_big_p);
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assert (output_format != NULL);
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outbfd = bfd_openw (argv[optind + 1], output_format);
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if (outbfd == NULL)
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bfd_fatal (argv[optind + 1]);
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if (! bfd_set_format (outbfd, bfd_object))
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bfd_fatal (argv[optind + 1]);
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assert (outbfd->xvec->flavour == bfd_target_nlm_flavour);
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if (bfd_arch_get_compatible (inbfd, outbfd) == NULL)
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fprintf (stderr,
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"%s: warning:input and output formats are not compatible\n",
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program_name);
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/* Initialize the header information to default values. */
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fixed_hdr = nlm_fixed_header (outbfd);
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var_hdr = nlm_variable_header (outbfd);
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version_hdr = nlm_version_header (outbfd);
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copyright_hdr = nlm_copyright_header (outbfd);
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extended_hdr = nlm_extended_header (outbfd);
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check_procedure = NULL;
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custom_file = NULL;
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debug_info = false;
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exit_procedure = "_Stop";
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export_symbols = NULL;
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map_file = NULL;
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full_map = false;
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help_file = NULL;
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import_symbols = NULL;
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message_file = NULL;
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modules = NULL;
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sharelib_file = NULL;
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start_procedure = "_Prelude";
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verbose = false;
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rpc_file = NULL;
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parse_errors = 0;
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/* Parse the header file (if there is one). */
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if (header_file != NULL)
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{
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if (! nlmlex_file (header_file)
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|| yyparse () != 0
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|| parse_errors != 0)
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exit (1);
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}
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/* Start copying the input BFD to the output BFD. */
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if (! bfd_set_file_flags (outbfd, bfd_get_file_flags (inbfd)))
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bfd_fatal (bfd_get_filename (outbfd));
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symbols = (asymbol **) xmalloc (get_symtab_upper_bound (inbfd));
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symcount = bfd_canonicalize_symtab (inbfd, symbols);
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/* Adjust symbol information. */
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inlead = bfd_get_symbol_leading_char (inbfd);
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outlead = bfd_get_symbol_leading_char (outbfd);
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gotstart = false;
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gotexit = false;
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gotcheck = false;
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for (i = 0; i < symcount; i++)
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{
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register asymbol *sym;
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sym = symbols[i];
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/* Add or remove a leading underscore. */
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if (inlead != outlead)
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{
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if (inlead != '\0')
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{
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if (bfd_asymbol_name (sym)[0] == inlead)
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{
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if (outlead == '\0')
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++sym->name;
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else
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{
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char *new;
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new = xmalloc (strlen (bfd_asymbol_name (sym)) + 1);
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new[0] = outlead;
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strcpy (new + 1, bfd_asymbol_name (sym) + 1);
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sym->name = new;
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}
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}
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}
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else
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{
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char *new;
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new = xmalloc (strlen (bfd_asymbol_name (sym)) + 2);
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new[0] = outlead;
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strcpy (new + 1, bfd_asymbol_name (sym));
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sym->name = new;
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}
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}
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/* If this is a global symbol, see if it's in the export list.
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Change the prefix if necessary. */
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if ((sym->flags & (BSF_EXPORT | BSF_GLOBAL)) != 0
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&& export_symbols != NULL)
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{
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register struct string_list *l;
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for (l = export_symbols; l != NULL; l = l->next)
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{
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if (strcmp (l->string, bfd_asymbol_name (sym)) == 0)
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break;
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else
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{
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char *zbase;
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zbase = strchr (l->string, '@');
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if (zbase != NULL
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&& strcmp (zbase + 1, bfd_asymbol_name (sym)) == 0)
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{
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sym->name = l->string;
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break;
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}
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}
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}
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if (l == NULL)
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fprintf (stderr,
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"%s: warning: symbol %s exported but not in export list\n",
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program_name, bfd_asymbol_name (sym));
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}
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/* If it's an undefined symbol, see if it's on the import list.
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Change the prefix if necessary. */
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if (bfd_get_section (sym) == &bfd_und_section
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&& import_symbols != NULL)
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{
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register struct string_list *l;
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for (l = import_symbols; l != NULL; l = l->next)
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{
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if (strcmp (l->string, bfd_asymbol_name (sym)) == 0)
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break;
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else
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{
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char *zbase;
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zbase = strchr (l->string, '@');
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if (zbase != NULL
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&& strcmp (zbase + 1, bfd_asymbol_name (sym)) == 0)
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{
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sym->name = l->string;
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break;
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}
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}
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}
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if (l == NULL)
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fprintf (stderr,
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"%s: warning: symbol %s imported but not in import list\n",
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program_name, bfd_asymbol_name (sym));
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}
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/* See if it's one of the special named symbols. */
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if (strcmp (bfd_asymbol_name (sym), start_procedure) == 0)
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{
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if (! bfd_set_start_address (outbfd, bfd_asymbol_value (sym)))
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bfd_fatal ("set start address");
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gotstart = true;
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}
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if (strcmp (bfd_asymbol_name (sym), exit_procedure) == 0)
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{
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nlm_fixed_header (outbfd)->exitProcedureOffset =
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bfd_asymbol_value (sym);
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gotexit = true;
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}
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if (check_procedure != NULL
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&& strcmp (bfd_asymbol_name (sym), check_procedure) == 0)
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{
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nlm_fixed_header (outbfd)->checkUnloadProcedureOffset =
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bfd_asymbol_value (sym);
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gotcheck = true;
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}
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}
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bfd_set_symtab (outbfd, symbols, symcount);
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if (! gotstart)
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fprintf (stderr, "%s: warning: START procedure %s not defined\n",
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program_name, start_procedure);
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if (! gotexit)
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fprintf (stderr, "%s: warning: EXIT procedure %s not defined\n",
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program_name, exit_procedure);
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if (check_procedure != NULL
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&& ! gotcheck)
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fprintf (stderr, "%s: warning: CHECK procedure %s not defined\n",
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program_name, check_procedure);
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/* Set up the sections. */
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bfd_map_over_sections (inbfd, setup_sections, (PTR) outbfd);
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/* Add additional sections required for the header information. */
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if (custom_file != NULL)
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{
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custom_data = fopen (custom_file, "r");
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if (custom_data == NULL
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|| fstat (fileno (custom_data), &st) < 0)
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{
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fprintf (stderr, "%s:%s: %s\n", program_name, custom_file,
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strerror (errno));
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custom_file = NULL;
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}
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else
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{
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custom_size = st.st_size;
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custom_section = bfd_make_section (outbfd, ".nlmcustom");
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if (custom_section == NULL
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|| ! bfd_set_section_size (outbfd, custom_section, custom_size)
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|| ! bfd_set_section_flags (outbfd, custom_section,
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SEC_HAS_CONTENTS))
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bfd_fatal ("custom section");
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}
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}
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if (help_file != NULL)
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{
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help_data = fopen (help_file, "r");
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if (help_data == NULL
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|| fstat (fileno (help_data), &st) < 0)
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{
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fprintf (stderr, "%s:%s: %s\n", program_name, help_file,
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strerror (errno));
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help_file = NULL;
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}
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else
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{
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help_size = st.st_size;
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help_section = bfd_make_section (outbfd, ".nlmhelp");
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if (help_section == NULL
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|| ! bfd_set_section_size (outbfd, help_section, help_size)
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|| ! bfd_set_section_flags (outbfd, help_section,
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SEC_HAS_CONTENTS))
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bfd_fatal ("help section");
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strncpy (nlm_extended_header (outbfd)->stamp, "MeSsAgEs", 8);
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}
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}
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if (message_file != NULL)
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{
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message_data = fopen (message_file, "r");
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if (message_data == NULL
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|| fstat (fileno (message_data), &st) < 0)
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{
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fprintf (stderr, "%s:%s: %s\n", program_name, message_file,
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strerror (errno));
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message_file = NULL;
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}
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else
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{
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message_size = st.st_size;
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message_section = bfd_make_section (outbfd, ".nlmmessages");
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if (message_section == NULL
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|| ! bfd_set_section_size (outbfd, message_section, message_size)
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|| ! bfd_set_section_flags (outbfd, message_section,
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SEC_HAS_CONTENTS))
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bfd_fatal ("message section");
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strncpy (nlm_extended_header (outbfd)->stamp, "MeSsAgEs", 8);
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}
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}
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if (modules != NULL)
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{
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struct string_list *l;
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module_size = 0;
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for (l = modules; l != NULL; l = l->next)
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module_size += strlen (l->string) + 1;
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module_section = bfd_make_section (outbfd, ".nlmmodules");
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if (module_section == NULL
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|| ! bfd_set_section_size (outbfd, module_section, module_size)
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|| ! bfd_set_section_flags (outbfd, module_section,
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SEC_HAS_CONTENTS))
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bfd_fatal ("module section");
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}
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if (rpc_file != NULL)
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{
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rpc_data = fopen (rpc_file, "r");
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if (rpc_data == NULL
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|| fstat (fileno (rpc_data), &st) < 0)
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{
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fprintf (stderr, "%s:%s: %s\n", program_name, rpc_file,
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strerror (errno));
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rpc_file = NULL;
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}
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else
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{
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rpc_size = st.st_size;
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rpc_section = bfd_make_section (outbfd, ".nlmrpc");
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if (rpc_section == NULL
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|| ! bfd_set_section_size (outbfd, rpc_section, rpc_size)
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|| ! bfd_set_section_flags (outbfd, rpc_section,
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SEC_HAS_CONTENTS))
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bfd_fatal ("rpc section");
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strncpy (nlm_extended_header (outbfd)->stamp, "MeSsAgEs", 8);
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}
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}
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/* Copy over the sections. */
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bfd_map_over_sections (inbfd, copy_sections, (PTR) outbfd);
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/* Finish up the header information. */
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if (custom_file != NULL)
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{
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PTR data;
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data = xmalloc (custom_size);
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if (fread (data, 1, custom_size, custom_data) != custom_size)
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fprintf (stderr, "%s:%s: read: %s\n", program_name, custom_file,
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strerror (errno));
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else
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{
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if (! bfd_set_section_contents (outbfd, custom_section, data,
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(file_ptr) 0, custom_size))
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bfd_fatal ("custom section");
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nlm_fixed_header (outbfd)->customDataOffset =
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custom_section->filepos;
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nlm_fixed_header (outbfd)->customDataSize = custom_size;
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}
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free (data);
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}
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if (! debug_info)
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{
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/* As a special hack, the backend recognizes a debugInfoOffset
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of -1 to mean that it should not output any debugging
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information. This can not be handling by fiddling with the
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symbol table because exported symbols appear in both the
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export information and the debugging information. */
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nlm_fixed_header (outbfd)->debugInfoOffset = (file_ptr) -1;
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}
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if (map_file != NULL)
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fprintf (stderr,
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"%s: MAP and FULLMAP are not supported; try ld -M\n",
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program_name);
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if (help_file != NULL)
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{
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PTR data;
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data = xmalloc (help_size);
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if (fread (data, 1, help_size, help_data) != help_size)
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fprintf (stderr, "%s:%s: read: %s\n", program_name, help_file,
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strerror (errno));
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else
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{
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if (! bfd_set_section_contents (outbfd, help_section, data,
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(file_ptr) 0, help_size))
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bfd_fatal ("help section");
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nlm_extended_header (outbfd)->helpFileOffset =
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help_section->filepos;
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||
nlm_extended_header (outbfd)->helpFileLength = help_size;
|
||
}
|
||
free (data);
|
||
}
|
||
if (message_file != NULL)
|
||
{
|
||
PTR data;
|
||
|
||
data = xmalloc (message_size);
|
||
if (fread (data, 1, message_size, message_data) != message_size)
|
||
fprintf (stderr, "%s:%s: read: %s\n", program_name, message_file,
|
||
strerror (errno));
|
||
else
|
||
{
|
||
if (! bfd_set_section_contents (outbfd, message_section, data,
|
||
(file_ptr) 0, message_size))
|
||
bfd_fatal ("message section");
|
||
nlm_extended_header (outbfd)->messageFileOffset =
|
||
message_section->filepos;
|
||
nlm_extended_header (outbfd)->messageFileLength = message_size;
|
||
|
||
/* FIXME: Are these offsets correct on all platforms? Are
|
||
they 32 bits on all platforms? What endianness? */
|
||
nlm_extended_header (outbfd)->languageID =
|
||
bfd_h_get_32 (outbfd, (bfd_byte *) data + 106);
|
||
nlm_extended_header (outbfd)->messageCount =
|
||
bfd_h_get_32 (outbfd, (bfd_byte *) data + 110);
|
||
}
|
||
free (data);
|
||
}
|
||
if (modules != NULL)
|
||
{
|
||
PTR data;
|
||
char *set;
|
||
struct string_list *l;
|
||
bfd_size_type c;
|
||
|
||
data = xmalloc (module_size);
|
||
c = 0;
|
||
set = (char *) data;
|
||
for (l = modules; l != NULL; l = l->next)
|
||
{
|
||
*set = strlen (l->string);
|
||
strncpy (set + 1, l->string, *set);
|
||
set += *set + 1;
|
||
++c;
|
||
}
|
||
if (! bfd_set_section_contents (outbfd, module_section, data,
|
||
(file_ptr) 0, module_size))
|
||
bfd_fatal ("module section");
|
||
nlm_fixed_header (outbfd)->moduleDependencyOffset =
|
||
module_section->filepos;
|
||
nlm_fixed_header (outbfd)->numberOfModuleDependencies = c;
|
||
}
|
||
if (rpc_file != NULL)
|
||
{
|
||
PTR data;
|
||
|
||
data = xmalloc (rpc_size);
|
||
if (fread (data, 1, rpc_size, rpc_data) != rpc_size)
|
||
fprintf (stderr, "%s:%s: read: %s\n", program_name, rpc_file,
|
||
strerror (errno));
|
||
else
|
||
{
|
||
if (! bfd_set_section_contents (outbfd, rpc_section, data,
|
||
(file_ptr) 0, rpc_size))
|
||
bfd_fatal ("rpc section");
|
||
nlm_extended_header (outbfd)->RPCDataOffset =
|
||
rpc_section->filepos;
|
||
nlm_extended_header (outbfd)->RPCDataLength = rpc_size;
|
||
}
|
||
free (data);
|
||
}
|
||
len = strlen (argv[optind + 1]);
|
||
if (len > NLM_MODULE_NAME_SIZE - 2)
|
||
len = NLM_MODULE_NAME_SIZE - 2;
|
||
nlm_fixed_header (outbfd)->moduleName[0] = len;
|
||
strncpy (nlm_fixed_header (outbfd)->moduleName + 1, argv[optind + 1],
|
||
NLM_MODULE_NAME_SIZE - 2);
|
||
nlm_fixed_header (outbfd)->moduleName[NLM_MODULE_NAME_SIZE - 1] = '\0';
|
||
strncpy (nlm_variable_header (outbfd)->oldThreadName, " LONG",
|
||
NLM_OLD_THREAD_NAME_LENGTH);
|
||
|
||
if (! bfd_close (outbfd))
|
||
bfd_fatal (argv[optind + 1]);
|
||
if (! bfd_close (inbfd))
|
||
bfd_fatal (argv[optind]);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Display a help message and exit. */
|
||
|
||
static void
|
||
show_help ()
|
||
{
|
||
printf ("%s: Convert an object file into a NetWare Loadable Module\n",
|
||
program_name);
|
||
show_usage (stdout, 0);
|
||
}
|
||
|
||
/* Show a usage message and exit. */
|
||
|
||
static void
|
||
show_usage (file, status)
|
||
FILE *file;
|
||
int status;
|
||
{
|
||
fprintf (file, "\
|
||
Usage: %s [-Hv] [-I format] [-O format] [-T header-file]\n\
|
||
[--input-format=format] [--output-format=format]\n\
|
||
[--header-file=file] [--help] [--version]\n\
|
||
in-file out-file\n",
|
||
program_name);
|
||
exit (status);
|
||
}
|
||
|
||
/* Select the output format based on the input architecture, machine,
|
||
and endianness. This chooses the appropriate NLM target. */
|
||
|
||
static const char *
|
||
select_output_format (arch, mach, bigendian)
|
||
enum bfd_architecture arch;
|
||
long mach;
|
||
boolean bigendian;
|
||
{
|
||
switch (arch)
|
||
{
|
||
case bfd_arch_i386:
|
||
return "nlm32-i386";
|
||
default:
|
||
fprintf (stderr, "%s: no default NLM format for %s\n",
|
||
program_name, bfd_printable_arch_mach (arch, mach));
|
||
exit (1);
|
||
/* Avoid warning. */
|
||
return NULL;
|
||
}
|
||
/*NOTREACHED*/
|
||
}
|
||
|
||
/* The BFD sections are copied in two passes. This function sets up
|
||
the section name, size, etc. */
|
||
|
||
static void
|
||
setup_sections (inbfd, insec, data_ptr)
|
||
bfd *inbfd;
|
||
asection *insec;
|
||
PTR data_ptr;
|
||
{
|
||
bfd *outbfd = (bfd *) data_ptr;
|
||
asection *outsec;
|
||
|
||
outsec = bfd_get_section_by_name (outbfd, bfd_section_name (inbfd, insec));
|
||
if (outsec == NULL)
|
||
{
|
||
outsec = bfd_make_section (outbfd, bfd_section_name (inbfd, insec));
|
||
if (outsec == NULL)
|
||
bfd_fatal ("make section");
|
||
}
|
||
|
||
insec->output_section = outsec;
|
||
insec->output_offset = 0;
|
||
|
||
if (! bfd_set_section_size (outbfd, outsec,
|
||
bfd_section_size (inbfd, insec)))
|
||
bfd_fatal ("set section size");
|
||
|
||
if (! bfd_set_section_vma (outbfd, outsec,
|
||
bfd_section_vma (inbfd, insec)))
|
||
bfd_fatal ("set section vma");
|
||
|
||
if (! bfd_set_section_alignment (outbfd, outsec,
|
||
bfd_section_alignment (inbfd, insec)))
|
||
bfd_fatal ("set section alignment");
|
||
|
||
if (! bfd_set_section_flags (outbfd, outsec,
|
||
bfd_get_section_flags (inbfd, insec)))
|
||
bfd_fatal ("set section flags");
|
||
}
|
||
|
||
/* Copy the section contents. */
|
||
|
||
static void
|
||
copy_sections (inbfd, insec, data_ptr)
|
||
bfd *inbfd;
|
||
asection *insec;
|
||
PTR data_ptr;
|
||
{
|
||
bfd *outbfd = (bfd *) data_ptr;
|
||
asection *outsec;
|
||
bfd_size_type size;
|
||
PTR contents;
|
||
bfd_size_type reloc_size;
|
||
|
||
outsec = bfd_get_section_by_name (outbfd, bfd_section_name (inbfd, insec));
|
||
assert (outsec != NULL);
|
||
|
||
size = bfd_get_section_size_before_reloc (insec);
|
||
if (size == 0)
|
||
return;
|
||
|
||
/* FIXME: Why are these necessary? */
|
||
insec->_cooked_size = insec->_raw_size;
|
||
insec->reloc_done = true;
|
||
|
||
if ((bfd_get_section_flags (inbfd, insec) & SEC_HAS_CONTENTS) == 0)
|
||
contents = NULL;
|
||
else
|
||
{
|
||
contents = xmalloc (size);
|
||
if (! bfd_get_section_contents (inbfd, insec, contents,
|
||
(file_ptr) 0, size))
|
||
bfd_fatal (bfd_get_filename (inbfd));
|
||
}
|
||
|
||
reloc_size = bfd_get_reloc_upper_bound (inbfd, insec);
|
||
if (reloc_size == 0)
|
||
bfd_set_reloc (outbfd, outsec, (arelent **) NULL, 0);
|
||
else
|
||
{
|
||
arelent **relocs;
|
||
bfd_size_type reloc_count;
|
||
|
||
relocs = (arelent **) xmalloc (reloc_size);
|
||
reloc_count = bfd_canonicalize_reloc (inbfd, insec, relocs, symbols);
|
||
mangle_relocs (outbfd, relocs, reloc_count, (char *) contents, size);
|
||
bfd_set_reloc (outbfd, outsec, relocs, reloc_count);
|
||
}
|
||
|
||
if (contents != NULL)
|
||
{
|
||
if (! bfd_set_section_contents (outbfd, outsec, contents,
|
||
(file_ptr) 0, size))
|
||
bfd_fatal (bfd_get_filename (outbfd));
|
||
free (contents);
|
||
}
|
||
}
|
||
|
||
/* Some, perhaps all, NetWare targets require changing the relocs used
|
||
by the input formats. */
|
||
|
||
static void
|
||
mangle_relocs (outbfd, relocs, reloc_count, contents, contents_size)
|
||
bfd *outbfd;
|
||
arelent **relocs;
|
||
bfd_size_type reloc_count;
|
||
char *contents;
|
||
bfd_size_type contents_size;
|
||
{
|
||
switch (bfd_get_arch (outbfd))
|
||
{
|
||
case bfd_arch_i386:
|
||
i386_mangle_relocs (outbfd, relocs, reloc_count, contents,
|
||
contents_size);
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* NetWare on the i386 supports a restricted set of relocs, which are
|
||
different from those used on other i386 targets. This routine
|
||
converts the relocs. It is, obviously, very target dependent. At
|
||
the moment, the nlm32-i386 backend performs similar translations;
|
||
however, it is more reliable and efficient to do them here. */
|
||
|
||
static reloc_howto_type nlm_i386_pcrel_howto =
|
||
HOWTO (1, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
0, /* special_function */
|
||
"DISP32", /* name */
|
||
true, /* partial_inplace */
|
||
0xffffffff, /* src_mask */
|
||
0xffffffff, /* dst_mask */
|
||
true); /* pcrel_offset */
|
||
|
||
static void
|
||
i386_mangle_relocs (outbfd, relocs, reloc_count, contents, contents_size)
|
||
bfd *outbfd;
|
||
arelent **relocs;
|
||
bfd_size_type reloc_count;
|
||
char *contents;
|
||
bfd_size_type contents_size;
|
||
{
|
||
while (reloc_count-- != 0)
|
||
{
|
||
arelent *rel;
|
||
asymbol *sym;
|
||
bfd_vma addend;
|
||
|
||
rel = *relocs++;
|
||
sym = *rel->sym_ptr_ptr;
|
||
|
||
/* Note that no serious harm will ensue if we fail to change a
|
||
reloc. The backend will fail when writing out the reloc. */
|
||
|
||
/* Make sure this reloc is within the data we have. We use only
|
||
4 byte relocs here, so we insist on having 4 bytes. */
|
||
if (rel->address + 4 > contents_size)
|
||
continue;
|
||
|
||
/* NetWare doesn't support reloc addends, so we get rid of them
|
||
here by simply adding them into the object data. We handle
|
||
the symbol value, if any, the same way. */
|
||
addend = rel->addend;
|
||
if (! bfd_is_com_section (bfd_get_section (sym)))
|
||
addend += sym->value;
|
||
|
||
if (addend != 0
|
||
&& rel->howto != NULL
|
||
&& rel->howto->rightshift == 0
|
||
&& rel->howto->size == 2
|
||
&& rel->howto->bitsize == 32
|
||
&& rel->howto->bitpos == 0
|
||
&& rel->howto->src_mask == 0xffffffff
|
||
&& rel->howto->dst_mask == 0xffffffff)
|
||
{
|
||
bfd_vma val;
|
||
|
||
val = bfd_get_32 (outbfd, contents + rel->address);
|
||
val += addend;
|
||
bfd_put_32 (outbfd, val, contents + rel->address);
|
||
|
||
/* Adjust the reloc for the changes we just made. */
|
||
rel->addend = 0;
|
||
if (! bfd_is_com_section (bfd_get_section (sym))
|
||
&& sym->value != 0)
|
||
rel->sym_ptr_ptr = bfd_get_section (sym)->symbol_ptr_ptr;
|
||
}
|
||
|
||
/* NetWare uses a reloc with pcrel_offset set. We adjust
|
||
pc_relative relocs accordingly. We are going to change the
|
||
howto field, so we can only do this if the current one is
|
||
compatible. We should check that special_function is NULL
|
||
here, but at the moment coff-i386 uses a special_function
|
||
which does not affect what we are doing here. */
|
||
if (rel->howto != NULL
|
||
&& rel->howto->pc_relative
|
||
&& ! rel->howto->pcrel_offset
|
||
&& rel->howto->rightshift == 0
|
||
&& rel->howto->size == 2
|
||
&& rel->howto->bitsize == 32
|
||
&& rel->howto->bitpos == 0
|
||
&& rel->howto->src_mask == 0xffffffff
|
||
&& rel->howto->dst_mask == 0xffffffff)
|
||
{
|
||
bfd_vma val;
|
||
|
||
/* When pcrel_offset is not set, it means that the negative
|
||
of the address of the memory location is stored in the
|
||
memory location. We must add it back in. */
|
||
val = bfd_get_32 (outbfd, contents + rel->address);
|
||
val += rel->address;
|
||
bfd_put_32 (outbfd, val, contents + rel->address);
|
||
|
||
/* We must change to a new howto. */
|
||
rel->howto = &nlm_i386_pcrel_howto;
|
||
}
|
||
}
|
||
}
|