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145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
/*-
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* Copyright (c) 2006 Joseph Koshy
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/limits.h>
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#include <assert.h>
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#include <gelf.h>
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#include "_libelf.h"
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GElf_Dyn *
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gelf_getdyn(Elf_Data *d, int ndx, GElf_Dyn *dst)
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{
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int ec;
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Elf *e;
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Elf_Scn *scn;
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Elf32_Dyn *dyn32;
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Elf64_Dyn *dyn64;
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size_t msz;
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uint32_t sh_type;
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if (d == NULL || ndx < 0 || dst == NULL ||
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(scn = d->d_scn) == NULL ||
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(e = scn->s_elf) == NULL) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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ec = e->e_class;
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assert(ec == ELFCLASS32 || ec == ELFCLASS64);
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if (ec == ELFCLASS32)
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sh_type = scn->s_shdr.s_shdr32.sh_type;
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else
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sh_type = scn->s_shdr.s_shdr64.sh_type;
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if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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msz = _libelf_msize(ELF_T_DYN, ec, e->e_version);
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assert(msz > 0);
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if (msz * ndx >= d->d_size) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (NULL);
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}
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if (ec == ELFCLASS32) {
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dyn32 = (Elf32_Dyn *) d->d_buf + ndx;
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dst->d_tag = dyn32->d_tag;
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dst->d_un.d_val = (Elf64_Xword) dyn32->d_un.d_val;
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} else {
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dyn64 = (Elf64_Dyn *) d->d_buf + ndx;
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*dst = *dyn64;
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}
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return (dst);
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}
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int
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gelf_update_dyn(Elf_Data *d, int ndx, GElf_Dyn *ds)
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{
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int ec;
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Elf *e;
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Elf_Scn *scn;
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Elf32_Dyn *dyn32;
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Elf64_Dyn *dyn64;
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size_t msz;
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uint32_t sh_type;
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if (d == NULL || ndx < 0 || ds == NULL ||
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(scn = d->d_scn) == NULL ||
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(e = scn->s_elf) == NULL) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (0);
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}
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ec = e->e_class;
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assert(ec == ELFCLASS32 || ec == ELFCLASS64);
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if (ec == ELFCLASS32)
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sh_type = scn->s_shdr.s_shdr32.sh_type;
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else
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sh_type = scn->s_shdr.s_shdr64.sh_type;
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if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (0);
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}
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msz = _libelf_msize(ELF_T_DYN, ec, e->e_version);
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assert(msz > 0);
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if (msz * ndx >= d->d_size) {
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LIBELF_SET_ERROR(ARGUMENT, 0);
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return (0);
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}
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if (ec == ELFCLASS32) {
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dyn32 = (Elf32_Dyn *) d->d_buf + ndx;
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LIBELF_COPY_S32(dyn32, ds, d_tag);
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LIBELF_COPY_U32(dyn32, ds, d_un.d_val);
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} else {
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dyn64 = (Elf64_Dyn *) d->d_buf + ndx;
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*dyn64 = *ds;
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}
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return (1);
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}
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