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gelf_syminfo.c revision 1.6 
      1 /*	$NetBSD: gelf_syminfo.c,v 1.6 2025/12/25 18:58:13 jkoshy 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 
     38 #include "_libelf.h"
     39 
     40 ELFTC_VCSID("Id: gelf_syminfo.c 4074 2025-01-07 15:34:21Z jkoshy");
     41 
     42 __RCSID("$NetBSD: gelf_syminfo.c,v 1.6 2025/12/25 18:58:13 jkoshy Exp $");
     43 
     44 GElf_Syminfo *
     45 gelf_getsyminfo(Elf_Data *ed, int ndx, GElf_Syminfo *dst)
     46 {
     47 	Elf *e;
     48 	size_t msz;
     49 	Elf_Scn *scn;
     50 	unsigned int ec;
     51 	uint32_t sh_type;
     52 	struct _Libelf_Data *d;
     53 	Elf32_Syminfo *syminfo32;
     54 	Elf64_Syminfo *syminfo64;
     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_SYMINFO) {
     74 		LIBELF_SET_ERROR(ARGUMENT, 0);
     75 		return (NULL);
     76 	}
     77 
     78 	if ((msz = _libelf_msize(ELF_T_SYMINFO, ec, e->e_version)) == 0)
     79 		return (NULL);
     80 
     81 	assert(ndx >= 0);
     82 
     83 	if (msz * (size_t) ndx >= d->d_data.d_size) {
     84 		LIBELF_SET_ERROR(ARGUMENT, 0);
     85 		return (NULL);
     86 	}
     87 
     88 	if (ec == ELFCLASS32) {
     89 
     90 		syminfo32 = (Elf32_Syminfo *) d->d_data.d_buf + ndx;
     91 
     92 		dst->si_boundto = syminfo32->si_boundto;
     93 		dst->si_flags   = syminfo32->si_flags;
     94 
     95 	} else {
     96 
     97 		syminfo64 = (Elf64_Syminfo *) d->d_data.d_buf + ndx;
     98 
     99 		*dst = *syminfo64;
    100 	}
    101 
    102 	return (dst);
    103 }
    104 
    105 int
    106 gelf_update_syminfo(Elf_Data *ed, int ndx, GElf_Syminfo *gs)
    107 {
    108 	Elf *e;
    109 	size_t msz;
    110 	Elf_Scn *scn;
    111 	unsigned int ec;
    112 	uint32_t sh_type;
    113 	struct _Libelf_Data *d;
    114 	Elf32_Syminfo *syminfo32;
    115 	Elf64_Syminfo *syminfo64;
    116 
    117 	d = (struct _Libelf_Data *) ed;
    118 
    119 	if (d == NULL || ndx < 0 || gs == 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_SYMINFO) {
    135 		LIBELF_SET_ERROR(ARGUMENT, 0);
    136 		return (0);
    137 	}
    138 
    139 	if ((msz = _libelf_msize(ELF_T_SYMINFO, ec, e->e_version)) == 0)
    140 		return (0);
    141 
    142 	assert(ndx >= 0);
    143 
    144 	if (msz * (size_t) ndx >= d->d_data.d_size) {
    145 		LIBELF_SET_ERROR(ARGUMENT, 0);
    146 		return (0);
    147 	}
    148 
    149 	if (ec == ELFCLASS32) {
    150 		syminfo32 = (Elf32_Syminfo *) d->d_data.d_buf + ndx;
    151 
    152 		syminfo32->si_boundto  = gs->si_boundto;
    153 		syminfo32->si_flags  = gs->si_flags;
    154 
    155 	} else {
    156 		syminfo64 = (Elf64_Syminfo *) d->d_data.d_buf + ndx;
    157 
    158 		*syminfo64 = *gs;
    159 	}
    160 
    161 	return (1);
    162 }
    163