| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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 COPYRIGHT HOLDERS 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 |
| * COPYRIGHT OWNER 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 <elf.h> |
| #include <sys/types.h> |
| #include <link.h> |
| |
| /* Dynamic binaries get this from the dynamic linker (system/linker), which |
| * we don't pull in for static bins. We also don't have a list of so's to |
| * iterate over, since there's really only a single monolithic blob of |
| * code/data. |
| * |
| * All we need to do is to find where the executable is in memory, and grab the |
| * phdr and phnum from there. |
| */ |
| |
| /* ld provides this to us in the default link script */ |
| extern void *__executable_start; |
| |
| int |
| dl_iterate_phdr(int (*cb)(struct dl_phdr_info *info, size_t size, void *data), |
| void *data) |
| { |
| struct dl_phdr_info dl_info; |
| Elf32_Ehdr *ehdr = (Elf32_Ehdr *) &__executable_start; |
| Elf32_Phdr *phdr = (Elf32_Phdr *)((unsigned long)ehdr + ehdr->e_phoff); |
| |
| /* TODO: again, copied from linker.c. Find a better home for this |
| * later. */ |
| if (ehdr->e_ident[EI_MAG0] != ELFMAG0) return -1; |
| if (ehdr->e_ident[EI_MAG1] != ELFMAG1) return -1; |
| if (ehdr->e_ident[EI_MAG2] != ELFMAG2) return -1; |
| if (ehdr->e_ident[EI_MAG3] != ELFMAG3) return -1; |
| |
| dl_info.dlpi_addr = 0; |
| dl_info.dlpi_name = NULL; |
| dl_info.dlpi_phdr = phdr; |
| dl_info.dlpi_phnum = ehdr->e_phnum; |
| return cb(&dl_info, sizeof (struct dl_phdr_info), data); |
| } |