1/* bionic/arch-x86/bionic/dl_iterate_phdr_static.c 2** 3** Copyright 2006, The Android Open Source Project 4** 5** Redistribution and use in source and binary forms, with or without 6** modification, are permitted provided that the following conditions are met: 7** * Redistributions of source code must retain the above copyright 8** notice, this list of conditions and the following disclaimer. 9** * Redistributions in binary form must reproduce the above copyright 10** notice, this list of conditions and the following disclaimer in the 11** documentation and/or other materials provided with the distribution. 12** * Neither the name of Google Inc. nor the names of its contributors may 13** be used to endorse or promote products derived from this software 14** without specific prior written permission. 15** 16** THIS SOFTWARE IS PROVIDED BY Google Inc. ``AS IS'' AND ANY EXPRESS OR 17** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 19** EVENT SHALL Google Inc. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21** PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22** OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24** OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25** ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26*/ 27 28#include <sys/types.h> 29#include <linux/elf.h> 30 31/* TODO: Move this into a header that linker.h can also pull it in. 32 * Silly to have same struct in 2 places. This is temporary. */ 33struct dl_phdr_info 34{ 35 Elf32_Addr dlpi_addr; 36 const char *dlpi_name; 37 const Elf32_Phdr *dlpi_phdr; 38 Elf32_Half dlpi_phnum; 39}; 40 41/* Dynamic binaries get this from the dynamic linker (system/linker), which 42 * we don't pull in for static bins. We also don't have a list of so's to 43 * iterate over, since there's really only a single monolithic blob of 44 * code/data. 45 * 46 * All we need to do is to find where the executable is in memory, and grab the 47 * phdr and phnum from there. 48 */ 49 50/* ld provides this to us in the default link script */ 51extern void *__executable_start; 52 53int 54dl_iterate_phdr(int (*cb)(struct dl_phdr_info *info, size_t size, void *data), 55 void *data) 56{ 57 struct dl_phdr_info dl_info; 58 Elf32_Ehdr *ehdr = (Elf32_Ehdr *) &__executable_start; 59 Elf32_Phdr *phdr = (Elf32_Phdr *)((unsigned long)ehdr + ehdr->e_phoff); 60 61 /* TODO: again, copied from linker.c. Find a better home for this 62 * later. */ 63 if (ehdr->e_ident[EI_MAG0] != ELFMAG0) return -1; 64 if (ehdr->e_ident[EI_MAG1] != ELFMAG1) return -1; 65 if (ehdr->e_ident[EI_MAG2] != ELFMAG2) return -1; 66 if (ehdr->e_ident[EI_MAG3] != ELFMAG3) return -1; 67 68 dl_info.dlpi_addr = 0; 69 dl_info.dlpi_name = NULL; 70 dl_info.dlpi_phdr = phdr; 71 dl_info.dlpi_phnum = ehdr->e_phnum; 72 return cb(&dl_info, sizeof (struct dl_phdr_info), data); 73} 74 75