75 lines
3 KiB
C
75 lines
3 KiB
C
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/* bionic/arch-x86/bionic/dl_iterate_phdr_static.c
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**
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** Copyright 2006, The Android Open Source Project
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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 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 the
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** documentation and/or other materials provided with the distribution.
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** * Neither the name of Google Inc. nor the names of its contributors may
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** be used to endorse or promote products derived from this software
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** without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY Google Inc. ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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** EVENT SHALL Google Inc. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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** PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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** OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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** OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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** ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <linux/elf.h>
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/* TODO: Move this into a header that linker.h can also pull it in.
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* Silly to have same struct in 2 places. This is temporary. */
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struct dl_phdr_info
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{
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Elf32_Addr dlpi_addr;
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const char *dlpi_name;
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const Elf32_Phdr *dlpi_phdr;
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Elf32_Half dlpi_phnum;
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};
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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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