| /* bionic/arch-x86/bionic/dl_iterate_phdr_static.c |
| ** |
| ** Copyright 2006, The Android Open Source Project |
| ** |
| ** 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. |
| ** * Neither the name of Google Inc. nor the names of its contributors may |
| ** be used to endorse or promote products derived from this software |
| ** without specific prior written permission. |
| ** |
| ** THIS SOFTWARE IS PROVIDED BY Google Inc. ``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 Google Inc. 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> |
| |
| /* TODO: Move this into a header that linker.h can also pull it in. |
| * Silly to have same struct in 2 places. This is temporary. */ |
| struct dl_phdr_info |
| { |
| Elf32_Addr dlpi_addr; |
| const char *dlpi_name; |
| const Elf32_Phdr *dlpi_phdr; |
| Elf32_Half dlpi_phnum; |
| }; |
| |
| /* 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); |
| } |
| |