minecraft-pi-reborn/libreborn/include/libreborn/elf.h
2021-06-17 17:32:24 -04:00

68 lines
2.0 KiB
C

#pragma once
#ifdef __arm__
#include <unistd.h>
#include <string.h>
#include <sys/mman.h>
#include <elf.h>
#include "log.h"
// Find And Iterate Over All .text Sections In Current Binary
typedef void (*text_section_callback_t)(void *section, Elf32_Word size, void *data);
static inline void iterate_text_sections(text_section_callback_t callback, void *data) {
// Load Main Binary
char *real_path = realpath("/proc/self/exe", NULL);
FILE *file_obj = fopen(real_path, "rb");
// Verify Binary
if (!file_obj) {
ERR("Unable To Open Binary: %s", real_path);
}
// Get File Size
fseek(file_obj, 0L, SEEK_END);
long int size = ftell(file_obj);
fseek(file_obj, 0L, SEEK_SET);
// Map File To Pointer
unsigned char *file_map = (unsigned char *) mmap(0, size, PROT_READ, MAP_PRIVATE, fileno(file_obj), 0);
// Parse ELF
Elf32_Ehdr *elf_header = (Elf32_Ehdr *) file_map;
Elf32_Shdr *elf_section_headers = (Elf32_Shdr *) (file_map + elf_header->e_shoff);
int elf_section_header_count = elf_header->e_shnum;
// Locate Section Names
Elf32_Shdr elf_strtab = elf_section_headers[elf_header->e_shstrndx];
unsigned char *elf_strtab_p = file_map + elf_strtab.sh_offset;
// Track .text Sections
int text_sections = 0;
// Iterate Sections
for (int i = 0; i < elf_section_header_count; ++i) {
Elf32_Shdr header = elf_section_headers[i];
char *name = (char *) (elf_strtab_p + header.sh_name);
// Check Section Type
if (strcmp(name, ".text") == 0) {
// .text Section
(*callback)((void *) header.sh_addr, header.sh_size, data);
text_sections++;
}
}
// Ensure At Least .text Section Was Scanned
if (text_sections < 1) {
ERR("Unable To Find .text Sectons On: %s", real_path);
}
// Free Binary Path
free(real_path);
// Unmap And Close File
munmap(file_map, size);
fclose(file_obj);
}
#endif // #ifdef __arm__