1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/types.h> 30#include <linux/elf.h> 31#include <link.h> 32 33/* Dynamic binaries get this from the dynamic linker (system/linker), which 34 * we don't pull in for static bins. We also don't have a list of so's to 35 * iterate over, since there's really only a single monolithic blob of 36 * code/data. 37 * 38 * All we need to do is to find where the executable is in memory, and grab the 39 * phdr and phnum from there. 40 */ 41 42/* ld provides this to us in the default link script */ 43extern void *__executable_start; 44 45int 46dl_iterate_phdr(int (*cb)(struct dl_phdr_info *info, size_t size, void *data), 47 void *data) 48{ 49 struct dl_phdr_info dl_info; 50 Elf32_Ehdr *ehdr = (Elf32_Ehdr *) &__executable_start; 51 Elf32_Phdr *phdr = (Elf32_Phdr *)((unsigned long)ehdr + ehdr->e_phoff); 52 53 /* TODO: again, copied from linker.c. Find a better home for this 54 * later. */ 55 if (ehdr->e_ident[EI_MAG0] != ELFMAG0) return -1; 56 if (ehdr->e_ident[EI_MAG1] != ELFMAG1) return -1; 57 if (ehdr->e_ident[EI_MAG2] != ELFMAG2) return -1; 58 if (ehdr->e_ident[EI_MAG3] != ELFMAG3) return -1; 59 60 dl_info.dlpi_addr = 0; 61 dl_info.dlpi_name = NULL; 62 dl_info.dlpi_phdr = phdr; 63 dl_info.dlpi_phnum = ehdr->e_phnum; 64 return cb(&dl_info, sizeof (struct dl_phdr_info), data); 65} 66