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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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This commit is contained in:
Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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52
build/unix/elfhack/inject.c Normal file
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <stdint.h>
#include <elf.h>
/* The Android NDK headers define those */
#undef Elf_Ehdr
#undef Elf_Addr
#if defined(__LP64__)
#define Elf_Ehdr Elf64_Ehdr
#define Elf_Addr Elf64_Addr
#else
#define Elf_Ehdr Elf32_Ehdr
#define Elf_Addr Elf32_Addr
#endif
extern __attribute__((visibility("hidden"))) void original_init(int argc, char **argv, char **env);
extern __attribute__((visibility("hidden"))) Elf32_Rel relhack[];
extern __attribute__((visibility("hidden"))) Elf_Ehdr elf_header;
static inline __attribute__((always_inline))
void do_relocations(void)
{
Elf32_Rel *rel;
Elf_Addr *ptr, *start;
for (rel = relhack; rel->r_offset; rel++) {
start = (Elf_Addr *)((intptr_t)&elf_header + rel->r_offset);
for (ptr = start; ptr < &start[rel->r_info]; ptr++)
*ptr += (intptr_t)&elf_header;
}
}
__attribute__((section(".text._init_noinit")))
int init_noinit(int argc, char **argv, char **env)
{
do_relocations();
return 0;
}
__attribute__((section(".text._init")))
int init(int argc, char **argv, char **env)
{
do_relocations();
original_init(argc, argv, env);
// Ensure there is no tail-call optimization, avoiding the use of the
// B.W instruction in Thumb for the call above.
return 0;
}