/* Load an ELF file */
int load_elf(const char *elf)
{
int ret = 0;
do
{
g_elfdata = load_file(elf);
if(g_elfdata == NULL)
{
break;
}
if(!validate_header(g_elfdata))
{
break;
}
if(!load_sections(g_elfdata))
{
break;
}
if(!process_relocs())
{
break;
}
reindex_sections();
ret = 1;
}
while(0);
return ret;
}
int bflt_fload(FILE* fp, void **mem_ptr, size_t *mem_size, int (**entry_address_ptr)(int,char*[])) {
void * mem = NULL;
struct flat_hdr header;
info("Begin loading");
if (!fp) error_goto_error("Recieved bad file pointer");
if (read_header(fp, &header) != 0) error_goto_error("Could not parse header");
if (check_header(&header) != 0) error_goto_error("Bad header");
size_t binary_size = header.bss_end - header.entry;
info("Attempting to alloc %u bytes",binary_size);
mem = malloc(binary_size);
if (!mem) error_goto_error("Failed to alloc binary memory");
if (copy_segments(fp, &header, mem, binary_size) != 0) error_goto_error("Failed to copy segments");
if (process_relocs(fp, &header, mem) != 0) error_goto_error("Failed to relocate");
/* only attempt to process GOT if the flags tell us a GOT exists AND
if the Ndless startup file is not already doing so */
if (header.flags & FLAT_FLAG_GOTPIC && memcmp(mem, "PRG\0", 4) != 0) {
if (process_got(&header, mem) != 0) error_goto_error("Failed to process got");
}else{
info("No need to process got - skipping");
}
*mem_ptr = mem;
*mem_size = binary_size;
if (memcmp(mem, "PRG\0", 4) == 0) {
info("Detected as ndless program packaged in a bFLT file");
*entry_address_ptr = (int (*)(int,char*[]))((char*)mem + 4);
}else{
info("Detected as ordinary bFLT executable");
*entry_address_ptr = (int (*)(int,char*[]))mem;
}
info("Successfully loaded bFLT executable to memory");
return 0;
error:
if (mem) free(mem);
*mem_ptr = NULL;
*entry_address_ptr = NULL;
*mem_size = 0;
error_return("Caught error - exiting");
}
