Elf_Data * elf_getdata(Elf_Scn *s, Elf_Data *ed) { Elf *e; unsigned int sh_type; int elfclass, elftype; size_t fsz, msz, count; struct _Libelf_Data *d; uint64_t sh_align, sh_offset, sh_size; int (*xlate)(char *_d, size_t _dsz, char *_s, size_t _c, int _swap); d = (struct _Libelf_Data *) ed; if (s == NULL || (e = s->s_elf) == NULL || (d != NULL && s != d->d_scn)) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } assert(e->e_kind == ELF_K_ELF); if (d == NULL && (d = STAILQ_FIRST(&s->s_data)) != NULL) return (&d->d_data); if (d != NULL) return (&STAILQ_NEXT(d, d_next)->d_data); if (e->e_rawfile == NULL) { /* * In the ELF_C_WRITE case, there is no source that * can provide data for the section. */ LIBELF_SET_ERROR(ARGUMENT, 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 (sh_type == SHT_NULL) { LIBELF_SET_ERROR(SECTION, 0); return (NULL); } 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_data.d_buf = NULL; d->d_data.d_off = 0; d->d_data.d_align = sh_align; d->d_data.d_size = msz * count; d->d_data.d_type = elftype; d->d_data.d_version = e->e_version; if (sh_type == SHT_NOBITS || sh_size == 0) { STAILQ_INSERT_TAIL(&s->s_data, d, d_next); return (&d->d_data); } if ((d->d_data.d_buf = malloc(msz*count)) == NULL) { (void) _libelf_release_data(d); LIBELF_SET_ERROR(RESOURCE, 0); return (NULL); } d->d_flags |= LIBELF_F_DATA_MALLOCED; xlate = _libelf_get_translator(elftype, ELF_TOMEMORY, elfclass); if (!(*xlate)(d->d_data.d_buf, d->d_data.d_size, e->e_rawfile + sh_offset, count, e->e_byteorder != LIBELF_PRIVATE(byteorder))) { _libelf_release_data(d); LIBELF_SET_ERROR(DATA, 0); return (NULL); } STAILQ_INSERT_TAIL(&s->s_data, d, d_next); return (&d->d_data); }
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); }