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gelf_rela.c revision 1.2.8.2 
      1 /*	$NetBSD: gelf_rela.c,v 1.2.8.2 2014/08/19 23:46:45 tls 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_rela.c,v 1.2.8.2 2014/08/19 23:46:45 tls Exp $");
     42 ELFTC_VCSID("Id: gelf_rela.c 2272 2011-12-03 17:07:31Z jkoshy ");
     43 
     44 GElf_Rela *
     45 gelf_getrela(Elf_Data *ed, int ndx, GElf_Rela *dst)
     46 {
     47 	int ec;
     48 	Elf *e;
     49 	size_t msz;
     50 	Elf_Scn *scn;
     51 	uint32_t sh_type;
     52 	Elf32_Rela *rela32;
     53 	Elf64_Rela *rela64;
     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_RELA) {
     74 		LIBELF_SET_ERROR(ARGUMENT, 0);
     75 		return (NULL);
     76 	}
     77 
     78 	msz = _libelf_msize(ELF_T_RELA, 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 		rela32 = (Elf32_Rela *) d->d_data.d_buf + ndx;
     89 
     90 		dst->r_offset = (Elf64_Addr) rela32->r_offset;
     91 		dst->r_info   = ELF64_R_INFO(
     92 		    (Elf64_Xword) ELF32_R_SYM(rela32->r_info),
     93 		    ELF32_R_TYPE(rela32->r_info));
     94 		dst->r_addend = (Elf64_Sxword) rela32->r_addend;
     95 
     96 	} else {
     97 
     98 		rela64 = (Elf64_Rela *) d->d_data.d_buf + ndx;
     99 
    100 		*dst = *rela64;
    101 	}
    102 
    103 	return (dst);
    104 }
    105 
    106 int
    107 gelf_update_rela(Elf_Data *ed, int ndx, GElf_Rela *dr)
    108 {
    109 	int ec;
    110 	Elf *e;
    111 	size_t msz;
    112 	Elf_Scn *scn;
    113 	uint32_t sh_type;
    114 	Elf32_Rela *rela32;
    115 	Elf64_Rela *rela64;
    116 	struct _Libelf_Data *d;
    117 
    118 	d = (struct _Libelf_Data *) ed;
    119 
    120 	if (d == NULL || ndx < 0 || dr == NULL ||
    121 	    (scn = d->d_scn) == NULL ||
    122 	    (e = scn->s_elf) == NULL) {
    123 		LIBELF_SET_ERROR(ARGUMENT, 0);
    124 		return (0);
    125 	}
    126 
    127 	ec = e->e_class;
    128 	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
    129 
    130 	if (ec == ELFCLASS32)
    131 		sh_type = scn->s_shdr.s_shdr32.sh_type;
    132 	else
    133 		sh_type = scn->s_shdr.s_shdr64.sh_type;
    134 
    135 	if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) {
    136 		LIBELF_SET_ERROR(ARGUMENT, 0);
    137 		return (0);
    138 	}
    139 
    140 	msz = _libelf_msize(ELF_T_RELA, ec, e->e_version);
    141 	assert(msz > 0);
    142 
    143 	if (msz * ndx >= d->d_data.d_size) {
    144 		LIBELF_SET_ERROR(ARGUMENT, 0);
    145 		return (0);
    146 	}
    147 
    148 	if (ec == ELFCLASS32) {
    149 		rela32 = (Elf32_Rela *) d->d_data.d_buf + ndx;
    150 
    151 		LIBELF_COPY_U32(rela32, dr, r_offset);
    152 
    153 		if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0UL) ||
    154 		    ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) {
    155 			LIBELF_SET_ERROR(RANGE, 0);
    156 			return (0);
    157 		}
    158 		rela32->r_info = ELF32_R_INFO(ELF64_R_SYM(dr->r_info),
    159 		    ELF64_R_TYPE(dr->r_info));
    160 
    161 		LIBELF_COPY_S32(rela32, dr, r_addend);
    162 	} else {
    163 		rela64 = (Elf64_Rela *) d->d_data.d_buf + ndx;
    164 
    165 		*rela64 = *dr;
    166 	}
    167 
    168 	return (1);
    169 }
    170