Function generateLazyPointerScriptWithOptions

lldb_commands/ds.py:707–792

(section)

    '''

def generateLazyPointerScriptWithOptions(section):
    ptrsize = getType("void*").GetByteSize()
    size = section.GetByteSize() / ptrsize
    baseAddress = section.addr.module.FindSection("__TEXT").addr.GetLoadAddress(getTarget())
    linkeditAddress = section.addr.module.FindSection("__LINKEDIT").addr.GetLoadAddress(getTarget())
    la_symbol_addr = section.addr.module.FindSection("__DATA").FindSubSection("__la_symbol_ptr").addr.GetLoadAddress(getTarget())
    script = 'char *retstring[' + str(size) + '];\n'
    script += 'uint64_t baseAddress = (uintptr_t)' + str(baseAddress) + ';\n'
    script += 'uint64_t linkeditAddress = (uintptr_t)' + str(linkeditAddress) + ';\n'
    script += generateMachOHeaders()
    script += '''
  memset(&retstring, 0, sizeof(retstring));

  ds_symtab_command *symtab_cmd = NULL;
  ds_dysymtab_command *dysymtab_cmd = NULL;
  char *strtab = NULL;
  
  ds_header *dsheader = (ds_header *)baseAddress;
  ds_section *la_section = NULL;

  ds_segment *cur_seg = NULL;
  ds_segment *linkeditSegment = NULL;
  struct nlist_64 *symtab = NULL;
  uintptr_t pagezero = 0;
  
  uintptr_t cur = baseAddress + sizeof(ds_header);
  for (int i = 0; i < dsheader->ncmds; i++, cur += cur_seg->cmdsize) {
    cur_seg = (ds_segment *)cur;
    if (cur_seg->cmd == 0x2) { // LC_SYMTAB
      symtab_cmd = (ds_symtab_command *)cur_seg;

    } else if (cur_seg->cmd == 0xb) { // LC_DYSYMTAB
      dysymtab_cmd = (ds_dysymtab_command *)cur_seg;
    } 
    else if (cur_seg->cmd == 0x19 && strcmp(cur_seg->segname, "__LINKEDIT") == 0) {
        linkeditSegment = cur_seg;
    }
    else if (cur_seg->cmd == 0x19 && strcmp(cur_seg->segname, "__PAGEZERO") == 0) {
        pagezero = cur_seg->vmsize;
    }
    else if (cur_seg->cmd == 0x19 && strcmp(cur_seg->segname, "__DATA") == 0) {
        uintptr_t curs = cur + sizeof(ds_segment);
        for (int j = 0; j < cur_seg->nsects; j++, curs += sizeof(ds_section)) {
            ds_section *cur_sect = (ds_section*)curs; 
            if (strcmp(cur_sect->sectname, "__la_symbol_ptr") == 0) {
                la_section = (ds_section *)curs;
                break;
            }
        }
    }
  }
  
  uintptr_t linkedit_base = baseAddress + linkeditSegment->vmaddr - linkeditSegment->fileoff - pagezero;
  strtab = (char *)(symtab_cmd->stroff + linkedit_base);
  symtab = (struct nlist_64 *)(symtab_cmd->symoff + linkedit_base);

    if (!symtab_cmd || !dysymtab_cmd || !strtab || !la_section) {
        //strcat(retstring, "0|||An error has occurred in parsing");