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gelf_rel.c revision 1.2.4.2 
      1 /*	$NetBSD: gelf_rel.c,v 1.2.4.2 2014/05/22 15:44:47 yamt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2006,2008 Joseph Koshy
      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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #if HAVE_NBTOOL_CONFIG_H
     30 # include "nbtool_config.h"
     31 #endif
     32 
     33 #include <sys/cdefs.h>
     34 
     35 #include <assert.h>
     36 #include <gelf.h>
     37 #include <limits.h>
     38 
     39 #include "_libelf.h"
     40 
     41 __RCSID("$NetBSD: gelf_rel.c,v 1.2.4.2 2014/05/22 15:44:47 yamt Exp $");
     42 ELFTC_VCSID("Id: gelf_rel.c 2272 2011-12-03 17:07:31Z jkoshy ");
     43 
     44 GElf_Rel *
     45 gelf_getrel(Elf_Data *ed, int ndx, GElf_Rel *dst)
     46 {
     47 	int ec;
     48 	Elf *e;
     49 	size_t msz;
     50 	Elf_Scn *scn;
     51 	uint32_t sh_type;
     52 	Elf32_Rel *rel32;
     53 	Elf64_Rel *rel64;
     54 	struct _Libelf_Data *d;
     55 
     56 	d = (struct _Libelf_Data *) ed;
     57 
     58 	if (d == NULL || ndx < 0 || dst == NULL ||
     59 	    (scn = d->d_scn) == NULL ||
     60 	    (e = scn->s_elf) == NULL) {
     61 		LIBELF_SET_ERROR(ARGUMENT, 0);
     62 		return (NULL);
     63 	}
     64 
     65 	ec = e->e_class;
     66 	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
     67 
     68 	if (ec == ELFCLASS32)
     69 		sh_type = scn->s_shdr.s_shdr32.sh_type;
     70 	else
     71 		sh_type = scn->s_shdr.s_shdr64.sh_type;
     72 
     73 	if (_libelf_xlate_shtype(sh_type) != ELF_T_REL) {
     74 		LIBELF_SET_ERROR(ARGUMENT, 0);
     75 		return (NULL);
     76 	}
     77 
     78 	msz = _libelf_msize(ELF_T_REL, ec, e->e_version);
     79 
     80 	assert(msz > 0);
     81 
     82 	if (msz * ndx >= d->d_data.d_size) {
     83 		LIBELF_SET_ERROR(ARGUMENT, 0);
     84 		return (NULL);
     85 	}
     86 
     87 	if (ec == ELFCLASS32) {
     88 		rel32 = (Elf32_Rel *) d->d_data.d_buf + ndx;
     89 
     90 		dst->r_offset = (Elf64_Addr) rel32->r_offset;
     91 		dst->r_info   = ELF64_R_INFO(
     92 		    (Elf64_Xword) ELF32_R_SYM(rel32->r_info),
     93 		    ELF32_R_TYPE(rel32->r_info));
     94 
     95 	} else {
     96 
     97 		rel64 = (Elf64_Rel *) d->d_data.d_buf + ndx;
     98 
     99 		*dst = *rel64;
    100 	}
    101 
    102 	return (dst);
    103 }
    104 
    105 int
    106 gelf_update_rel(Elf_Data *ed, int ndx, GElf_Rel *dr)
    107 {
    108 	int ec;
    109 	Elf *e;
    110 	size_t msz;
    111 	Elf_Scn *scn;
    112 	uint32_t sh_type;
    113 	Elf32_Rel *rel32;
    114 	Elf64_Rel *rel64;
    115 	struct _Libelf_Data *d;
    116 
    117 	d = (struct _Libelf_Data *) ed;
    118 
    119 	if (d == NULL || ndx < 0 || dr == NULL ||
    120 	    (scn = d->d_scn) == NULL ||
    121 	    (e = scn->s_elf) == NULL) {
    122 		LIBELF_SET_ERROR(ARGUMENT, 0);
    123 		return (0);
    124 	}
    125 
    126 	ec = e->e_class;
    127 	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
    128 
    129 	if (ec == ELFCLASS32)
    130 		sh_type = scn->s_shdr.s_shdr32.sh_type;
    131 	else
    132 		sh_type = scn->s_shdr.s_shdr64.sh_type;
    133 
    134 	if (_libelf_xlate_shtype(sh_type) != ELF_T_REL) {
    135 		LIBELF_SET_ERROR(ARGUMENT, 0);
    136 		return (0);
    137 	}
    138 
    139 	msz = _libelf_msize(ELF_T_REL, ec, e->e_version);
    140 	assert(msz > 0);
    141 
    142 	if (msz * ndx >= d->d_data.d_size) {
    143 		LIBELF_SET_ERROR(ARGUMENT, 0);
    144 		return (0);
    145 	}
    146 
    147 	if (ec == ELFCLASS32) {
    148 		rel32 = (Elf32_Rel *) d->d_data.d_buf + ndx;
    149 
    150 		LIBELF_COPY_U32(rel32, dr, r_offset);
    151 
    152 		if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0UL) ||
    153 		    ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) {
    154 			LIBELF_SET_ERROR(RANGE, 0);
    155 			return (0);
    156 		}
    157 		rel32->r_info = ELF32_R_INFO(ELF64_R_SYM(dr->r_info),
    158 		    ELF64_R_TYPE(dr->r_info));
    159 	} else {
    160 		rel64 = (Elf64_Rel *) d->d_data.d_buf + ndx;
    161 
    162 		*rel64 = *dr;
    163 	}
    164 
    165 	return (1);
    166 }
    167