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/*
* 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 <sys/types.h>
#include <linux/elf.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);
}
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