diff options
Diffstat (limited to 'ext/libelf/gelf_dyn.c')
| -rw-r--r-- | ext/libelf/gelf_dyn.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/ext/libelf/gelf_dyn.c b/ext/libelf/gelf_dyn.c new file mode 100644 index 000000000..982068099 --- /dev/null +++ b/ext/libelf/gelf_dyn.c @@ -0,0 +1,140 @@ +/*- + * 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. + */ + +#include <assert.h> +#include <limits.h> + +#include "gelf.h" +#include "_libelf.h" + +GElf_Dyn * +gelf_getdyn(Elf_Data *d, int ndx, GElf_Dyn *dst) +{ + int ec; + Elf *e; + Elf_Scn *scn; + Elf32_Dyn *dyn32; + Elf64_Dyn *dyn64; + size_t msz; + uint32_t sh_type; + + if (d == NULL || ndx < 0 || dst == NULL || + (scn = d->d_scn) == NULL || + (e = scn->s_elf) == NULL) { + LIBELF_SET_ERROR(ARGUMENT, 0); + return (NULL); + } + + ec = e->e_class; + assert(ec == ELFCLASS32 || ec == ELFCLASS64); + + if (ec == ELFCLASS32) + sh_type = scn->s_shdr.s_shdr32.sh_type; + else + sh_type = scn->s_shdr.s_shdr64.sh_type; + + if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) { + LIBELF_SET_ERROR(ARGUMENT, 0); + return (NULL); + } + + msz = _libelf_msize(ELF_T_DYN, ec, e->e_version); + + assert(msz > 0); + + if (msz * ndx >= d->d_size) { + LIBELF_SET_ERROR(ARGUMENT, 0); + return (NULL); + } + + if (ec == ELFCLASS32) { + dyn32 = (Elf32_Dyn *) d->d_buf + ndx; + + dst->d_tag = dyn32->d_tag; + dst->d_un.d_val = (Elf64_Xword) dyn32->d_un.d_val; + + } else { + + dyn64 = (Elf64_Dyn *) d->d_buf + ndx; + + *dst = *dyn64; + } + + return (dst); +} + +int +gelf_update_dyn(Elf_Data *d, int ndx, GElf_Dyn *ds) +{ + int ec; + Elf *e; + Elf_Scn *scn; + Elf32_Dyn *dyn32; + Elf64_Dyn *dyn64; + size_t msz; + uint32_t sh_type; + + if (d == NULL || ndx < 0 || ds == NULL || + (scn = d->d_scn) == NULL || + (e = scn->s_elf) == NULL) { + LIBELF_SET_ERROR(ARGUMENT, 0); + return (0); + } + + ec = e->e_class; + assert(ec == ELFCLASS32 || ec == ELFCLASS64); + + if (ec == ELFCLASS32) + sh_type = scn->s_shdr.s_shdr32.sh_type; + else + sh_type = scn->s_shdr.s_shdr64.sh_type; + + if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) { + LIBELF_SET_ERROR(ARGUMENT, 0); + return (0); + } + + msz = _libelf_msize(ELF_T_DYN, ec, e->e_version); + assert(msz > 0); + + if (msz * ndx >= d->d_size) { + LIBELF_SET_ERROR(ARGUMENT, 0); + return (0); + } + + if (ec == ELFCLASS32) { + dyn32 = (Elf32_Dyn *) d->d_buf + ndx; + + LIBELF_COPY_S32(dyn32, ds, d_tag); + LIBELF_COPY_U32(dyn32, ds, d_un.d_val); + } else { + dyn64 = (Elf64_Dyn *) d->d_buf + ndx; + + *dyn64 = *ds; + } + + return (1); +} |