Format

Linux/i386 Binary Executable File ZMAGIC

Summary

Name: Linux/i386 Binary Executable File ZMAGIC
Identifiers: PUID: fmt/1672
Description: ZMAGIC file format is a type of a.out (an abbreviated form of "assembler output") executable binary format used with Unix-like operating systems. The format was superseded by ELF file format with System V Release 4 around 1898, due to some limitations of the format. The ZMAGIC was the default a.out file format before they switched to QMAGIC files. Both formats of executable have a 32 byte header at the start of the file, but with ZMAGIC the .text section starts at byte offset 1024, while with QMAGIC the .text section starts at the beginning of the file and includes the header.
Note: https://www.linuxjournal.com/article/1059 https://www.linux.org/threads/types-of-executables.9206/ http://ftp.icm.edu.pl/packages/linux-uk/alpha/alpha/asm8.html#obj_file_formats_section https://www.win.tue.nl/~aeb/linux/lk/lk-3.html https://en.wikipedia.org/wiki/A.out https://wiki.osdev.org/A.out
File extensions: so, o
Source: The National Archives and Records Administration / The National Archives and Records Administration

Note: BOF; Offset: 0; Magic Bytes: Starting with either 0x07, 0x0B, 0xCC followed by either 0x00 or 0x01, then by 0x6400