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Fix the build

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Justine Tunney 2023-07-11 05:48:39 -07:00
parent 1ee2e89326
commit 18536950b3
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GPG key ID: BE714B4575D6E328
8 changed files with 212 additions and 42 deletions
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1
libc/elf/elf.h
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@ -18,6 +18,7 @@ Elf64_Sym *GetElfSymbols(const Elf64_Ehdr *, size_t, int, Elf64_Xword *);
Elf64_Shdr *GetElfSymbolTable(const Elf64_Ehdr *, size_t, int, Elf64_Xword *);
Elf64_Phdr *GetElfProgramHeaderAddress(const Elf64_Ehdr *, size_t, Elf64_Half);
Elf64_Shdr *GetElfSectionHeaderAddress(const Elf64_Ehdr *, size_t, Elf64_Half);
Elf64_Shdr *FindElfSectionByName(Elf64_Ehdr *, size_t, char *, const char *);
const char *GetElfString(const Elf64_Ehdr *, size_t, const char *, Elf64_Word);
void *GetElfSectionAddress(const Elf64_Ehdr *, size_t, const Elf64_Shdr *);
const char *GetElfSectionName(const Elf64_Ehdr *, size_t, Elf64_Shdr *);

44
libc/elf/findelfsectionbyname.c Normal file
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@ -0,0 +1,44 @@
/*-*- 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 2023 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/elf/struct/ehdr.h"
#include "libc/elf/struct/shdr.h"
#include "libc/str/str.h"
/**
* Returns ELF section header for section with name.
*
* @param elf points to the start of the executable image data
* @param mapsize is the number of bytes past `elf` we can access
* @return pointer to section header within image, or null
*/
Elf64_Shdr *FindElfSectionByName(Elf64_Ehdr *elf, size_t mapsize,
char *shdrstrtab, const char *name) {
long i;
Elf64_Shdr *shdr;
const char *secname;
for (i = 0; i < elf->e_shnum; ++i) {
if ((shdr = GetElfSectionHeaderAddress(elf, mapsize, i)) &&
(secname = GetElfString(elf, mapsize, shdrstrtab, shdr->sh_name)) &&
!strcmp(name, secname)) {
return shdr;
}
}
return 0;
}