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bin_bfd.c revision 1.1.1.2 
      1 /*	$NetBSD: bin_bfd.c,v 1.1.1.2 2018/04/14 15:37:47 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1996, 2002 Christopher G. Demetriou
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  *
     29  * <<Id: LICENSE_GC,v 1.1 2001/10/01 23:24:05 cgd Exp>>
     30  */
     31 
     32 #if HAVE_NBTOOL_CONFIG_H
     33 #include "nbtool_config.h"
     34 #endif
     35 
     36 #include <sys/cdefs.h>
     37 __RCSID("$NetBSD: bin_bfd.c,v 1.1.1.2 2018/04/14 15:37:47 christos Exp $");
     38 
     39 #include <stdio.h>
     40 #include <string.h>
     41 #include <stdlib.h>
     42 #include <err.h>
     43 #include <bfd.h>
     44 #include "bin.h"
     45 
     46 void *
     47 bin_open(int kfd, const char *kfile, const char *bfdname)
     48 {
     49 	bfd *abfd;
     50 	bfd_init();
     51 	if ((abfd = bfd_fdopenr(kfile, bfdname, kfd)) == NULL) {
     52 		bfd_perror("open");
     53 		exit(1);
     54 	}
     55 	if (!bfd_check_format(abfd, bfd_object)) {
     56 		bfd_perror("check format");
     57 		exit(1);
     58 	}
     59 	return abfd;
     60 }
     61 
     62 int
     63 bin_find_md_root(void *bin, const char *mappedkfile, off_t size,
     64     unsigned long text_start,
     65     const char *root_name, const char *size_name, size_t *md_root_offset,
     66     size_t *md_root_size_offset, uint32_t *md_root_size, int verbose)
     67 {
     68 	bfd *abfd = bin;
     69 	long i;
     70 	long storage_needed;
     71 	long number_of_symbols;
     72 	asymbol **symbol_table = NULL;
     73 	struct symbols {
     74 		const char *name;
     75 		size_t offset;
     76 	} *s, symbols[3];
     77 
     78 	symbols[0].offset = 0;
     79 	symbols[1].offset = 0;
     80 	symbols[0].name = root_name;
     81 	symbols[1].name = size_name;
     82 	symbols[2].name = NULL;
     83 
     84 	storage_needed = bfd_get_symtab_upper_bound(abfd);
     85 	if (storage_needed <= 0) {
     86 		warnx("bfd storage needed error");
     87 		return 1;
     88 	}
     89 
     90 	symbol_table = malloc(storage_needed);
     91 	if (symbol_table == NULL) {
     92 		warn("symbol table");
     93 		return 1;
     94 	}
     95 
     96 	number_of_symbols = bfd_canonicalize_symtab(abfd, symbol_table);
     97 	if (number_of_symbols <= 0) {
     98 		warnx("can't canonicalize symbol table");
     99 		free(symbol_table);
    100 		return 1;
    101 	}
    102 
    103 	for (i = 0; i < number_of_symbols; i++) {
    104 		for (s = symbols; s->name != NULL; s++) {
    105 			const char *sym = symbol_table[i]->name;
    106 
    107 			/*
    108 			 * match symbol prefix '_' or ''.
    109 			 */
    110 			if (!strcmp(s->name, sym) ||
    111 			    !strcmp(s->name + 1, sym)) {
    112 				s->offset =
    113 				    (size_t)(symbol_table[i]->section->filepos
    114 				    + symbol_table[i]->value);
    115 			}
    116 		}
    117 	}
    118 
    119 	free(symbol_table);
    120 
    121 	for (s = symbols; s->name != NULL; s++) {
    122 		if (s->offset == 0) {
    123 			warnx("missing offset for `%s'", s->name);
    124 			return 1;
    125 		}
    126 	}
    127 
    128 	*md_root_offset = symbols[0].offset;
    129 	*md_root_size_offset = symbols[1].offset;
    130 	*md_root_size = bfd_get_32(abfd, &mappedkfile[*md_root_size_offset]);
    131 
    132 	return 0;
    133 }
    134 
    135 void
    136 bin_put_32(void *bin, off_t size, char *buf)
    137 {
    138 	bfd_put_32((struct bfd *)bin, size, buf);
    139 }
    140 
    141 void
    142 bin_close(void *bin)
    143 {
    144 	bfd_close_all_done((struct bfd *)bin);
    145 }
    146 
    147 const char **
    148 bin_supported_targets(void)
    149 {
    150 	return bfd_target_list();
    151 }
    152