66 lines
2.6 KiB
C
66 lines
2.6 KiB
C
/*
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* Copyright (C) 2006 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <elf.h>
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#include <sys/types.h>
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#include <link.h>
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/* Dynamic binaries get this from the dynamic linker (system/linker), which
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* we don't pull in for static bins. We also don't have a list of so's to
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* iterate over, since there's really only a single monolithic blob of
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* code/data.
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*
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* All we need to do is to find where the executable is in memory, and grab the
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* phdr and phnum from there.
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*/
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/* ld provides this to us in the default link script */
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extern void *__executable_start;
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int
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dl_iterate_phdr(int (*cb)(struct dl_phdr_info *info, size_t size, void *data),
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void *data)
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{
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struct dl_phdr_info dl_info;
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Elf32_Ehdr *ehdr = (Elf32_Ehdr *) &__executable_start;
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Elf32_Phdr *phdr = (Elf32_Phdr *)((unsigned long)ehdr + ehdr->e_phoff);
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/* TODO: again, copied from linker.c. Find a better home for this
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* later. */
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if (ehdr->e_ident[EI_MAG0] != ELFMAG0) return -1;
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if (ehdr->e_ident[EI_MAG1] != ELFMAG1) return -1;
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if (ehdr->e_ident[EI_MAG2] != ELFMAG2) return -1;
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if (ehdr->e_ident[EI_MAG3] != ELFMAG3) return -1;
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dl_info.dlpi_addr = 0;
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dl_info.dlpi_name = NULL;
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dl_info.dlpi_phdr = phdr;
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dl_info.dlpi_phnum = ehdr->e_phnum;
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return cb(&dl_info, sizeof (struct dl_phdr_info), data);
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}
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