/* $NetBSD: elf_data.c,v 1.5 2010/02/22 10:48:32 darran Exp $ */ /*- * Copyright (c) 2006 Joseph Koshy * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if HAVE_NBTOOL_CONFIG_H # include "nbtool_config.h" #endif #include /* __FBSDID("$FreeBSD: src/lib/libelf/elf_data.c,v 1.2.10.1.2.1 2009/10/25 01:10:29 kensmith Exp $"); */ #include #include #include #include #include "_libelf.h" Elf_Data * elf_getdata(Elf_Scn *s, Elf_Data *d) { Elf *e; size_t fsz, msz, count; int elfclass, elftype; unsigned int sh_type; uint64_t sh_align, sh_offset, sh_size; void (*xlate)(char *_d, char *_s, size_t _c, int _swap); if (s == NULL || (e = s->s_elf) == NULL || e->e_kind != ELF_K_ELF || (d != NULL && s != d->d_scn)) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } if (d == NULL && (d = STAILQ_FIRST(&s->s_data)) != NULL) return (d); if (d != NULL) return (STAILQ_NEXT(d, d_next)); if (e->e_rawfile == NULL) { LIBELF_SET_ERROR(SEQUENCE, 0); return (NULL); } elfclass = e->e_class; assert(elfclass == ELFCLASS32 || elfclass == ELFCLASS64); if (elfclass == ELFCLASS32) { sh_type = s->s_shdr.s_shdr32.sh_type; sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset; sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size; sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign; } else { sh_type = s->s_shdr.s_shdr64.sh_type; sh_offset = s->s_shdr.s_shdr64.sh_offset; sh_size = s->s_shdr.s_shdr64.sh_size; sh_align = s->s_shdr.s_shdr64.sh_addralign; } if ((elftype = _libelf_xlate_shtype(sh_type)) < ELF_T_FIRST || elftype > ELF_T_LAST || (sh_type != SHT_NOBITS && sh_offset + sh_size > (uint64_t) e->e_rawsize)) { LIBELF_SET_ERROR(SECTION, 0); return (NULL); } if ((fsz = (elfclass == ELFCLASS32 ? elf32_fsize : elf64_fsize)(elftype, (size_t) 1, e->e_version)) == 0) { LIBELF_SET_ERROR(UNIMPL, 0); return (NULL); } if (sh_size % fsz) { LIBELF_SET_ERROR(SECTION, 0); return (NULL); } count = sh_size / fsz; msz = _libelf_msize(elftype, elfclass, e->e_version); assert(msz > 0); if ((d = _libelf_allocate_data(s)) == NULL) return (NULL); d->d_buf = NULL; d->d_off = 0; d->d_align = sh_align; d->d_size = msz * count; d->d_type = elftype; d->d_version = e->e_version; if (sh_type == SHT_NOBITS) return (d); d->d_flags |= LIBELF_F_MALLOCED; if ((d->d_buf = malloc(msz*count)) == NULL) { (void) _libelf_release_data(d); LIBELF_SET_ERROR(RESOURCE, 0); return (NULL); } STAILQ_INSERT_TAIL(&s->s_data, d, d_next); xlate = _libelf_get_translator(elftype, ELF_TOMEMORY, elfclass); (*xlate)(d->d_buf, e->e_rawfile + sh_offset, count, e->e_byteorder != _libelf_host_byteorder()); return (d); } Elf_Data * elf_newdata(Elf_Scn *s) { Elf *e; Elf_Data *d; if (s == NULL || (e = s->s_elf) == NULL || e->e_kind != ELF_K_ELF) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } /* * elf_newdata() has to append a data descriptor, so * bring in existing section data if not already present. */ if (e->e_rawfile && s->s_size > 0 && STAILQ_EMPTY(&s->s_data)) if (elf_getdata(s, NULL) == NULL) return (NULL); if ((d = malloc(sizeof(Elf_Data))) == NULL) { LIBELF_SET_ERROR(RESOURCE, errno); return (NULL); } STAILQ_INSERT_TAIL(&s->s_data, d, d_next); d->d_flags = 0; d->d_scn = s; d->d_align = 1; d->d_buf = NULL; d->d_off = (uint64_t) ~0; d->d_size = 0; d->d_type = ELF_T_BYTE; d->d_version = LIBELF_PRIVATE(version); (void) elf_flagscn(s, ELF_C_SET, ELF_F_DIRTY); return (d); } /* * Retrieve a data descriptor for raw (untranslated) data for section * `s'. */ Elf_Data * elf_rawdata(Elf_Scn *s, Elf_Data *d) { Elf *e; uint32_t sh_type; int elf_class; uint64_t sh_align, sh_offset, sh_size; if (s == NULL || (e = s->s_elf) == NULL || e->e_kind != ELF_K_ELF || e->e_rawfile == NULL) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } if (d == NULL && (d = STAILQ_FIRST(&s->s_rawdata)) != NULL) return (d); if (d != NULL) return (STAILQ_NEXT(d, d_next)); elf_class = e->e_class; assert(elf_class == ELFCLASS32 || elf_class == ELFCLASS64); if (elf_class == ELFCLASS32) { sh_type = s->s_shdr.s_shdr32.sh_type; sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset; sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size; sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign; } else { sh_type = s->s_shdr.s_shdr64.sh_type; sh_offset = s->s_shdr.s_shdr64.sh_offset; sh_size = s->s_shdr.s_shdr64.sh_size; sh_align = s->s_shdr.s_shdr64.sh_addralign; } if ((d = _libelf_allocate_data(s)) == NULL) return (NULL); d->d_buf = sh_type == SHT_NOBITS ? NULL : e->e_rawfile + sh_offset; d->d_off = 0; d->d_align = sh_align; d->d_size = sh_size; d->d_type = ELF_T_BYTE; d->d_version = e->e_version; STAILQ_INSERT_TAIL(&s->s_rawdata, d, d_next); return (d); }