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      1 /*	$NetBSD: gelf_shdr.c,v 1.7 2026/05/17 21:40:50 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 #include <libelf.h>
     38 #include <limits.h>
     39 #include <stdint.h>
     40 
     41 #include "_libelf.h"
     42 
     43 ELFTC_VCSID("Id: gelf_shdr.c 4074 2025-01-07 15:34:21Z jkoshy");
     44 
     45 __RCSID("$NetBSD: gelf_shdr.c,v 1.7 2026/05/17 21:40:50 jkoshy Exp $");
     46 
     47 Elf32_Shdr *
     48 elf32_getshdr(Elf_Scn *s)
     49 {
     50 	return (_libelf_getshdr(s, ELFCLASS32));
     51 }
     52 
     53 Elf64_Shdr *
     54 elf64_getshdr(Elf_Scn *s)
     55 {
     56 	return (_libelf_getshdr(s, ELFCLASS64));
     57 }
     58 
     59 GElf_Shdr *
     60 gelf_getshdr(Elf_Scn *s, GElf_Shdr *d)
     61 {
     62 	void *sh;
     63 	unsigned int ec;
     64 	Elf32_Shdr *sh32;
     65 	Elf64_Shdr *sh64;
     66 
     67 	if (d == NULL) {
     68 		LIBELF_SET_ERROR(ARGUMENT, 0);
     69 		return (NULL);
     70 	}
     71 
     72 	if ((sh = _libelf_getshdr(s, ELFCLASSNONE)) == NULL)
     73 		return (NULL);
     74 
     75 	ec = s->s_elf->e_class;
     76 	assert(ec == ELFCLASS32 || ec == ELFCLASS64);
     77 
     78 	if (ec == ELFCLASS32) {
     79 		sh32 = (Elf32_Shdr *) sh;
     80 
     81 		d->sh_name      = sh32->sh_name;
     82 		d->sh_type      = sh32->sh_type;
     83 		d->sh_flags     = (Elf64_Xword) sh32->sh_flags;
     84 		d->sh_addr      = (Elf64_Addr) sh32->sh_addr;
     85 		d->sh_offset    = (Elf64_Off) sh32->sh_offset;
     86 		d->sh_size      = (Elf64_Xword) sh32->sh_size;
     87 		d->sh_link      = sh32->sh_link;
     88 		d->sh_info      = sh32->sh_info;
     89 		d->sh_addralign = (Elf64_Xword) sh32->sh_addralign;
     90 		d->sh_entsize   = (Elf64_Xword) sh32->sh_entsize;
     91 	} else {
     92 		sh64 = (Elf64_Shdr *) sh;
     93 		*d = *sh64;
     94 	}
     95 
     96 	return (d);
     97 }
     98 
     99 int
    100 gelf_update_shdr(Elf_Scn *scn, GElf_Shdr *s)
    101 {
    102 	Elf *e;
    103 	unsigned int ec;
    104 	Elf32_Shdr *sh32;
    105 
    106 
    107 	if (s == NULL || scn == NULL || (e = scn->s_elf) == NULL ||
    108 	    e->e_kind != ELF_K_ELF ||
    109 	    ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) {
    110 		LIBELF_SET_ERROR(ARGUMENT, 0);
    111 		return (0);
    112 	}
    113 
    114 	if (e->e_cmd == ELF_C_READ) {
    115 		LIBELF_SET_ERROR(MODE, 0);
    116 		return (0);
    117 	}
    118 
    119 	(void) elf_flagscn(scn, ELF_C_SET, ELF_F_DIRTY);
    120 
    121 	if (ec == ELFCLASS64) {
    122 		scn->s_shdr.s_shdr64 = *s;
    123 		return (1);
    124 	}
    125 
    126 	sh32 = &scn->s_shdr.s_shdr32;
    127 
    128 	sh32->sh_name	 =  s->sh_name;
    129 	sh32->sh_type	 =  s->sh_type;
    130 	LIBELF_COPY_U32(sh32, s, sh_flags);
    131 	LIBELF_COPY_U32(sh32, s, sh_addr);
    132 	LIBELF_COPY_U32(sh32, s, sh_offset);
    133 	LIBELF_COPY_U32(sh32, s, sh_size);
    134 	sh32->sh_link	 =  s->sh_link;
    135 	sh32->sh_info	 =  s->sh_info;
    136 	LIBELF_COPY_U32(sh32, s, sh_addralign);
    137 	LIBELF_COPY_U32(sh32, s, sh_entsize);
    138 
    139 	return (1);
    140 }
    141