mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-03-03 23:48:21 +00:00
d7c79f43ef
- Found some bugs in LLVM compiler-rt library - The useless LIBC_STUBS package is now deleted - Improve the overflow checking story even further - Get chibicc tests working in MODE=dbg mode again - The libc/isystem/ headers now have correctly named guards
41 lines
2.6 KiB
C
41 lines
2.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/elf/elf.h"
|
|
#include "libc/stdckdint.h"
|
|
|
|
/**
|
|
* Returns pointer to elf section file content.
|
|
*
|
|
* This function shouldn't be used on the bss section.
|
|
*
|
|
* @param elf points to the start of the executable image
|
|
* @param mapsize is the number of bytes past `elf` we can access
|
|
* @param shdr is from GetElfSectionHeaderAddress() and null-propagating
|
|
* @return pointer to content bytes, or null on error
|
|
*/
|
|
void *GetElfSectionAddress(const Elf64_Ehdr *elf, // validated
|
|
size_t mapsize, // validated
|
|
const Elf64_Shdr *shdr) { // foreign
|
|
uint64_t last;
|
|
if (!shdr) return 0;
|
|
if (shdr->sh_size <= 0) return 0;
|
|
if (ckd_add(&last, shdr->sh_offset, shdr->sh_size)) return 0;
|
|
if (last > mapsize) return 0;
|
|
return (char *)elf + shdr->sh_offset;
|
|
}
|