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/* SPDX-FileCopyrightText: Copyright (C) 2024 ZeldaRET */
/* SPDX-License-Identifier: CC0-1.0 */
#include <errno.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "elf32.h"
#include "util.h"
/**
* Converts symbols defined in an ELF file to ABS symbols so their values remain
* unchanged after linking against them. This is used for soundfonts as references
* to symbols defined in the soundfont should remain file-relative even after the
* final link.
*/
int
main(int argc, char **argv)
{
if (argc < 3) {
fprintf(stderr, "Usage: %s in.elf out.elf\n", argv[0]);
return EXIT_FAILURE;
}
// read input elf file
size_t data_size;
void *data = elf32_read(argv[1], &data_size);
// locate symtab
Elf32_Shdr *symtab = elf32_get_symtab(data, data_size);
if (symtab == NULL)
error("Symtab not found");
uint32_t sh_offset = elf32_read32(symtab->sh_offset);
uint32_t sh_size = elf32_read32(symtab->sh_size);
// patch defined symbols to be ABS
Elf32_Sym *sym = GET_PTR(data, sh_offset);
Elf32_Sym *sym_end = GET_PTR(data, sh_offset + sh_size);
for (size_t i = 0; sym < sym_end; sym++, i++) {
validate_read(sh_offset + i * sizeof(Elf32_Sym), sizeof(Elf32_Sym), data_size);
if (elf32_read16(sym->st_shndx) != SHN_UND)
sym->st_shndx = elf32_write16(SHN_ABS);
}
// write output elf file
util_write_whole_file(argv[2], data, data_size);
return EXIT_SUCCESS;
}
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