1 /* $NetBSD: libelf_extended.c,v 1.3 2016/02/20 02:43:42 christos 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 <libelf.h> 37 38 #include "_libelf.h" 39 40 __RCSID("$NetBSD: libelf_extended.c,v 1.3 2016/02/20 02:43:42 christos Exp $"); 41 ELFTC_VCSID("Id: libelf_extended.c 3174 2015-03-27 17:13:41Z emaste "); 42 43 /* 44 * Retrieve section #0, allocating a new section if needed. 45 */ 46 static Elf_Scn * 47 _libelf_getscn0(Elf *e) 48 { 49 Elf_Scn *s; 50 51 if ((s = STAILQ_FIRST(&e->e_u.e_elf.e_scn)) != NULL) 52 return (s); 53 54 return (_libelf_allocate_scn(e, (size_t) SHN_UNDEF)); 55 } 56 57 int 58 _libelf_setshnum(Elf *e, void *eh, int ec, size_t shnum) 59 { 60 Elf_Scn *scn; 61 62 if (shnum >= SHN_LORESERVE) { 63 if ((scn = _libelf_getscn0(e)) == NULL) 64 return (0); 65 66 assert(scn->s_ndx == SHN_UNDEF); 67 68 if (ec == ELFCLASS32) 69 scn->s_shdr.s_shdr32.sh_size = shnum; 70 else 71 scn->s_shdr.s_shdr64.sh_size = shnum; 72 73 (void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY); 74 75 shnum = 0; 76 } 77 78 if (ec == ELFCLASS32) 79 ((Elf32_Ehdr *) eh)->e_shnum = shnum & 0xFFFFU; 80 else 81 ((Elf64_Ehdr *) eh)->e_shnum = shnum & 0xFFFFU; 82 83 84 return (1); 85 } 86 87 int 88 _libelf_setshstrndx(Elf *e, void *eh, int ec, size_t shstrndx) 89 { 90 Elf_Scn *scn; 91 92 if (shstrndx >= SHN_LORESERVE) { 93 if ((scn = _libelf_getscn0(e)) == NULL) 94 return (0); 95 96 assert(scn->s_ndx == SHN_UNDEF); 97 98 if (ec == ELFCLASS32) 99 scn->s_shdr.s_shdr32.sh_link = shstrndx; 100 else 101 scn->s_shdr.s_shdr64.sh_link = shstrndx; 102 103 (void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY); 104 105 shstrndx = SHN_XINDEX; 106 } 107 108 if (ec == ELFCLASS32) 109 ((Elf32_Ehdr *) eh)->e_shstrndx = shstrndx & 0xFFFFU; 110 else 111 ((Elf64_Ehdr *) eh)->e_shstrndx = shstrndx & 0xFFFFU; 112 113 return (1); 114 } 115 116 int 117 _libelf_setphnum(Elf *e, void *eh, int ec, size_t phnum) 118 { 119 Elf_Scn *scn; 120 121 if (phnum >= PN_XNUM) { 122 if ((scn = _libelf_getscn0(e)) == NULL) 123 return (0); 124 125 assert(scn->s_ndx == SHN_UNDEF); 126 127 if (ec == ELFCLASS32) 128 scn->s_shdr.s_shdr32.sh_info = phnum; 129 else 130 scn->s_shdr.s_shdr64.sh_info = phnum; 131 132 (void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY); 133 134 phnum = PN_XNUM; 135 } 136 137 if (ec == ELFCLASS32) 138 ((Elf32_Ehdr *) eh)->e_phnum = phnum & 0xFFFFU; 139 else 140 ((Elf64_Ehdr *) eh)->e_phnum = phnum & 0xFFFFU; 141 142 return (1); 143 } 144