1164190Sjkoshy/*- 2164190Sjkoshy * Copyright (c) 2006 Joseph Koshy 3164190Sjkoshy * All rights reserved. 4164190Sjkoshy * 5164190Sjkoshy * Redistribution and use in source and binary forms, with or without 6164190Sjkoshy * modification, are permitted provided that the following conditions 7164190Sjkoshy * are met: 8164190Sjkoshy * 1. Redistributions of source code must retain the above copyright 9164190Sjkoshy * notice, this list of conditions and the following disclaimer. 10164190Sjkoshy * 2. Redistributions in binary form must reproduce the above copyright 11164190Sjkoshy * notice, this list of conditions and the following disclaimer in the 12164190Sjkoshy * documentation and/or other materials provided with the distribution. 13164190Sjkoshy * 14164190Sjkoshy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15164190Sjkoshy * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16164190Sjkoshy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17164190Sjkoshy * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18164190Sjkoshy * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19164190Sjkoshy * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20164190Sjkoshy * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21164190Sjkoshy * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22164190Sjkoshy * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23164190Sjkoshy * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24164190Sjkoshy * SUCH DAMAGE. 25164190Sjkoshy */ 26164190Sjkoshy 27164190Sjkoshy#include <sys/cdefs.h> 28164190Sjkoshy__FBSDID("$FreeBSD: releng/10.3/lib/libelf/elf_data.c 246978 2013-02-19 03:23:13Z markj $"); 29164190Sjkoshy 30164190Sjkoshy#include <assert.h> 31164190Sjkoshy#include <errno.h> 32164190Sjkoshy#include <libelf.h> 33164190Sjkoshy#include <stdlib.h> 34164190Sjkoshy 35164190Sjkoshy#include "_libelf.h" 36164190Sjkoshy 37164190Sjkoshy 38164190SjkoshyElf_Data * 39164190Sjkoshyelf_getdata(Elf_Scn *s, Elf_Data *d) 40164190Sjkoshy{ 41164190Sjkoshy Elf *e; 42164190Sjkoshy size_t fsz, msz, count; 43164190Sjkoshy int elfclass, elftype; 44164190Sjkoshy unsigned int sh_type; 45164190Sjkoshy uint64_t sh_align, sh_offset, sh_size; 46210338Skaiw int (*xlate)(char *_d, size_t _dsz, char *_s, size_t _c, int _swap); 47164190Sjkoshy 48164190Sjkoshy if (s == NULL || (e = s->s_elf) == NULL || e->e_kind != ELF_K_ELF || 49164190Sjkoshy (d != NULL && s != d->d_scn)) { 50164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 51164190Sjkoshy return (NULL); 52164190Sjkoshy } 53164190Sjkoshy 54164190Sjkoshy if (d == NULL && (d = STAILQ_FIRST(&s->s_data)) != NULL) 55164190Sjkoshy return (d); 56164190Sjkoshy 57164190Sjkoshy if (d != NULL) 58164190Sjkoshy return (STAILQ_NEXT(d, d_next)); 59164190Sjkoshy 60164190Sjkoshy if (e->e_rawfile == NULL) { 61164190Sjkoshy LIBELF_SET_ERROR(SEQUENCE, 0); 62164190Sjkoshy return (NULL); 63164190Sjkoshy } 64164190Sjkoshy 65164190Sjkoshy elfclass = e->e_class; 66164190Sjkoshy 67164190Sjkoshy assert(elfclass == ELFCLASS32 || elfclass == ELFCLASS64); 68164190Sjkoshy 69164190Sjkoshy if (elfclass == ELFCLASS32) { 70164190Sjkoshy sh_type = s->s_shdr.s_shdr32.sh_type; 71164190Sjkoshy sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset; 72164190Sjkoshy sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size; 73164190Sjkoshy sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign; 74164190Sjkoshy } else { 75164190Sjkoshy sh_type = s->s_shdr.s_shdr64.sh_type; 76164190Sjkoshy sh_offset = s->s_shdr.s_shdr64.sh_offset; 77164190Sjkoshy sh_size = s->s_shdr.s_shdr64.sh_size; 78164190Sjkoshy sh_align = s->s_shdr.s_shdr64.sh_addralign; 79164190Sjkoshy } 80164190Sjkoshy 81246978Smarkj if (sh_type == SHT_NULL) { 82246978Smarkj LIBELF_SET_ERROR(SECTION, 0); 83210324Skaiw return (NULL); 84246978Smarkj } 85210324Skaiw 86164190Sjkoshy if ((elftype = _libelf_xlate_shtype(sh_type)) < ELF_T_FIRST || 87210324Skaiw elftype > ELF_T_LAST || (sh_type != SHT_NOBITS && 88210324Skaiw sh_offset + sh_size > (uint64_t) e->e_rawsize)) { 89164190Sjkoshy LIBELF_SET_ERROR(SECTION, 0); 90164190Sjkoshy return (NULL); 91164190Sjkoshy } 92164190Sjkoshy 93210324Skaiw if ((fsz = (elfclass == ELFCLASS32 ? elf32_fsize : elf64_fsize) 94210324Skaiw (elftype, (size_t) 1, e->e_version)) == 0) { 95164190Sjkoshy LIBELF_SET_ERROR(UNIMPL, 0); 96164190Sjkoshy return (NULL); 97164190Sjkoshy } 98164190Sjkoshy 99164190Sjkoshy if (sh_size % fsz) { 100164190Sjkoshy LIBELF_SET_ERROR(SECTION, 0); 101164190Sjkoshy return (NULL); 102164190Sjkoshy } 103164190Sjkoshy 104164190Sjkoshy count = sh_size / fsz; 105164190Sjkoshy 106164190Sjkoshy msz = _libelf_msize(elftype, elfclass, e->e_version); 107164190Sjkoshy 108164190Sjkoshy assert(msz > 0); 109164190Sjkoshy 110164190Sjkoshy if ((d = _libelf_allocate_data(s)) == NULL) 111164190Sjkoshy return (NULL); 112164190Sjkoshy 113210324Skaiw d->d_buf = NULL; 114164190Sjkoshy d->d_off = 0; 115164190Sjkoshy d->d_align = sh_align; 116164190Sjkoshy d->d_size = msz * count; 117164190Sjkoshy d->d_type = elftype; 118164190Sjkoshy d->d_version = e->e_version; 119164190Sjkoshy 120217833Skan if (sh_type == SHT_NOBITS || sh_size == 0) { 121217833Skan STAILQ_INSERT_TAIL(&s->s_data, d, d_next); 122210324Skaiw return (d); 123217833Skan } 124210324Skaiw 125210324Skaiw if ((d->d_buf = malloc(msz*count)) == NULL) { 126210324Skaiw (void) _libelf_release_data(d); 127210324Skaiw LIBELF_SET_ERROR(RESOURCE, 0); 128210324Skaiw return (NULL); 129210324Skaiw } 130210324Skaiw 131164190Sjkoshy d->d_flags |= LIBELF_F_MALLOCED; 132164190Sjkoshy 133164190Sjkoshy xlate = _libelf_get_translator(elftype, ELF_TOMEMORY, elfclass); 134210338Skaiw if (!(*xlate)(d->d_buf, d->d_size, e->e_rawfile + sh_offset, count, 135210338Skaiw e->e_byteorder != LIBELF_PRIVATE(byteorder))) { 136210338Skaiw _libelf_release_data(d); 137210338Skaiw LIBELF_SET_ERROR(DATA, 0); 138210338Skaiw return (NULL); 139210338Skaiw } 140164190Sjkoshy 141210338Skaiw STAILQ_INSERT_TAIL(&s->s_data, d, d_next); 142210338Skaiw 143164190Sjkoshy return (d); 144164190Sjkoshy} 145164190Sjkoshy 146164190SjkoshyElf_Data * 147164190Sjkoshyelf_newdata(Elf_Scn *s) 148164190Sjkoshy{ 149164190Sjkoshy Elf *e; 150164190Sjkoshy Elf_Data *d; 151164190Sjkoshy 152164190Sjkoshy if (s == NULL || (e = s->s_elf) == NULL || 153164190Sjkoshy e->e_kind != ELF_K_ELF) { 154164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 155164190Sjkoshy return (NULL); 156164190Sjkoshy } 157164190Sjkoshy 158164190Sjkoshy /* 159164190Sjkoshy * elf_newdata() has to append a data descriptor, so 160164190Sjkoshy * bring in existing section data if not already present. 161164190Sjkoshy */ 162164190Sjkoshy if (e->e_rawfile && s->s_size > 0 && STAILQ_EMPTY(&s->s_data)) 163164190Sjkoshy if (elf_getdata(s, NULL) == NULL) 164164190Sjkoshy return (NULL); 165164190Sjkoshy 166210324Skaiw if ((d = _libelf_allocate_data(s)) == NULL) 167164190Sjkoshy return (NULL); 168164190Sjkoshy 169164190Sjkoshy STAILQ_INSERT_TAIL(&s->s_data, d, d_next); 170164190Sjkoshy 171164190Sjkoshy d->d_align = 1; 172164190Sjkoshy d->d_buf = NULL; 173164190Sjkoshy d->d_off = (uint64_t) ~0; 174164190Sjkoshy d->d_size = 0; 175164190Sjkoshy d->d_type = ELF_T_BYTE; 176164190Sjkoshy d->d_version = LIBELF_PRIVATE(version); 177164190Sjkoshy 178164190Sjkoshy (void) elf_flagscn(s, ELF_C_SET, ELF_F_DIRTY); 179164190Sjkoshy 180164190Sjkoshy return (d); 181164190Sjkoshy} 182164190Sjkoshy 183164190Sjkoshy/* 184164190Sjkoshy * Retrieve a data descriptor for raw (untranslated) data for section 185164190Sjkoshy * `s'. 186164190Sjkoshy */ 187164190Sjkoshy 188164190SjkoshyElf_Data * 189164190Sjkoshyelf_rawdata(Elf_Scn *s, Elf_Data *d) 190164190Sjkoshy{ 191164190Sjkoshy Elf *e; 192164190Sjkoshy int elf_class; 193210324Skaiw uint32_t sh_type; 194164190Sjkoshy uint64_t sh_align, sh_offset, sh_size; 195164190Sjkoshy 196164190Sjkoshy if (s == NULL || (e = s->s_elf) == NULL || 197164190Sjkoshy e->e_kind != ELF_K_ELF || e->e_rawfile == NULL) { 198164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 199164190Sjkoshy return (NULL); 200164190Sjkoshy } 201164190Sjkoshy 202164190Sjkoshy if (d == NULL && (d = STAILQ_FIRST(&s->s_rawdata)) != NULL) 203164190Sjkoshy return (d); 204164190Sjkoshy 205164190Sjkoshy if (d != NULL) 206164190Sjkoshy return (STAILQ_NEXT(d, d_next)); 207164190Sjkoshy 208164190Sjkoshy elf_class = e->e_class; 209164190Sjkoshy 210164190Sjkoshy assert(elf_class == ELFCLASS32 || elf_class == ELFCLASS64); 211164190Sjkoshy 212164190Sjkoshy if (elf_class == ELFCLASS32) { 213210324Skaiw sh_type = s->s_shdr.s_shdr32.sh_type; 214164190Sjkoshy sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset; 215164190Sjkoshy sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size; 216164190Sjkoshy sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign; 217164190Sjkoshy } else { 218210324Skaiw sh_type = s->s_shdr.s_shdr64.sh_type; 219167687Sjkoshy sh_offset = s->s_shdr.s_shdr64.sh_offset; 220167687Sjkoshy sh_size = s->s_shdr.s_shdr64.sh_size; 221167687Sjkoshy sh_align = s->s_shdr.s_shdr64.sh_addralign; 222164190Sjkoshy } 223164190Sjkoshy 224246978Smarkj if (sh_type == SHT_NULL) { 225246978Smarkj LIBELF_SET_ERROR(SECTION, 0); 226210324Skaiw return (NULL); 227246978Smarkj } 228210324Skaiw 229164190Sjkoshy if ((d = _libelf_allocate_data(s)) == NULL) 230164190Sjkoshy return (NULL); 231164190Sjkoshy 232221595Skaiw d->d_buf = (sh_type == SHT_NOBITS || sh_size == 0) ? NULL : 233221595Skaiw e->e_rawfile + sh_offset; 234164190Sjkoshy d->d_off = 0; 235164190Sjkoshy d->d_align = sh_align; 236164190Sjkoshy d->d_size = sh_size; 237164190Sjkoshy d->d_type = ELF_T_BYTE; 238164190Sjkoshy d->d_version = e->e_version; 239164190Sjkoshy 240164190Sjkoshy STAILQ_INSERT_TAIL(&s->s_rawdata, d, d_next); 241164190Sjkoshy 242164190Sjkoshy return (d); 243164190Sjkoshy} 244