static const
pid_t _gen_child() {
uint8_t buf[PAGE_SIZE];
mem_assign(buf, PAGE_SIZE, TRAP, TRAP_SZ);
uint8_t *elf;
const size_t elf_sz = gen_elf(&elf, options.start, (uint8_t *)buf, PAGE_SIZE);
const int exe_fd = write_exe(elf, elf_sz, options.savefile);
free(elf);
const pid_t tracee = fork();
if (tracee < 0) {
perror("fork");
exit(EXIT_FAILURE);
} else if (tracee == 0) {
ptrace_child(exe_fd);
abort();
}
// Parent
close(exe_fd);
return tracee;
}
int main(int argc, char *argv[]) {
int ret = 0;
if (argc != 5) {
printf(
"ARM ELF relocation fixer\n"
"Usage: %s inputelf inputbinary outputfile /path/to/startup.bin\n"
,argv[0]);
return 0;
}
int fd = open(argv[1],O_RDONLY);
if (fd < 0) {
printf("%s: Unable to open \"%s\"\n", argv[0], argv[1]);
goto error;
}
FILE *startup = NULL, *inbin = NULL, *out = NULL;
if ( !(inbin = fopen(argv[2],"rb")) ) {
printf("%s: Unable to open \"%s\"\n", argv[0], argv[2]);
goto error;
}
if ( !(out = fopen(argv[3],"wb")) ) {
printf("%s: Unable to open \"%s\"\n", argv[0], argv[3]);
goto error;
}
if ( !(startup = fopen(argv[4],"rb")) ) {
printf("%s: Unable to open \"%s\"\n", argv[0], argv[4]);
goto error;
}
uint32_t count;
uint32_t * offsets = elf_get_offsets(fd, &count);
if (!offsets) {
printf("%s: Unable to parse ELF file \"%s\"\n", argv[0], argv[1]);
goto error;
}
write_startup(startup, out);
write_offsets(offsets, count, out);
write_exe(inbin, out);
free(offsets);
goto success;
error:
ret = -1;
success:
if (fd >= 0) close(fd);
fclose(startup);
fclose(out);
fclose(inbin);
return ret;
}
