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comparison: build/unix/elfhack/inject.c
build/unix/elfhack/inject.c
- changeset 0
- 6474c204b198
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| -1:000000000000 | 0:31a88bc8edc4 |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 #include <stdint.h> | |
| 6 #include <elf.h> | |
| 7 | |
| 8 /* The Android NDK headers define those */ | |
| 9 #undef Elf_Ehdr | |
| 10 #undef Elf_Addr | |
| 11 | |
| 12 #if defined(__LP64__) | |
| 13 #define Elf_Ehdr Elf64_Ehdr | |
| 14 #define Elf_Addr Elf64_Addr | |
| 15 #else | |
| 16 #define Elf_Ehdr Elf32_Ehdr | |
| 17 #define Elf_Addr Elf32_Addr | |
| 18 #endif | |
| 19 | |
| 20 extern __attribute__((visibility("hidden"))) void original_init(int argc, char **argv, char **env); | |
| 21 | |
| 22 extern __attribute__((visibility("hidden"))) Elf32_Rel relhack[]; | |
| 23 extern __attribute__((visibility("hidden"))) Elf_Ehdr elf_header; | |
| 24 | |
| 25 static inline __attribute__((always_inline)) | |
| 26 void do_relocations(void) | |
| 27 { | |
| 28 Elf32_Rel *rel; | |
| 29 Elf_Addr *ptr, *start; | |
| 30 for (rel = relhack; rel->r_offset; rel++) { | |
| 31 start = (Elf_Addr *)((intptr_t)&elf_header + rel->r_offset); | |
| 32 for (ptr = start; ptr < &start[rel->r_info]; ptr++) | |
| 33 *ptr += (intptr_t)&elf_header; | |
| 34 } | |
| 35 } | |
| 36 | |
| 37 __attribute__((section(".text._init_noinit"))) | |
| 38 int init_noinit(int argc, char **argv, char **env) | |
| 39 { | |
| 40 do_relocations(); | |
| 41 return 0; | |
| 42 } | |
| 43 | |
| 44 __attribute__((section(".text._init"))) | |
| 45 int init(int argc, char **argv, char **env) | |
| 46 { | |
| 47 do_relocations(); | |
| 48 original_init(argc, argv, env); | |
| 49 // Ensure there is no tail-call optimization, avoiding the use of the | |
| 50 // B.W instruction in Thumb for the call above. | |
| 51 return 0; | |
| 52 } |
