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format binary
use32
org $08048000
ehdr:
mov eax, $$
mov ebx, $
mov ecx, $1
db $7F, "ELF" ; e_ident: magic
db 1 ; EI_CLASS: ELFCLASS32
db 1 ; EI_BYTE: ELFDATA2LSB (little endian, 2's complement)
db 1 ; version of the object file format
db 0 ; EI_VERSION: EV_CURRENT, ABI version
dd 0, 0 ; EI_PAD: padding
dw 2 ; e_type: executable
dw 3 ; e_machine: Intel 80386
dd 1 ; e_version: current version
dd _start ; e_entry: entry address to _start
dd phdr - $$ ; e_phoff: program header offset at phdr - current position
dd 0 ; e_shoff, no section header table
dd 0 ; e_flags
dw ehdrsize ; e_hsize: header size
dw phdrsize ; e_phentsize: size of a program header entry
dw 1 ; e_phnum: 1 entry in the program header table
dw 0 ; e_shentsize
dw 0 ; e_shnum
dw 0 ; e_shstrndx
ehdrsize = $ - ehdr
phdr:
dd 1 ; e_type: PT_LOAD
dd 0 ; e_offset
dd $$ ; p_vaddr
dd $$ ; p_paddr
dd filesize ; p_filesz
dd filesize ; p_memsz
dd 7 ; p_flags: Read, Write & Execute
dd 0x1000 ; p_align
phdrsize = $ - phdr
_start:
mov eax, 42
mov [a], eax
mov eax, 1
mov ebx, [a]
int $80
a: dd 43
filesize = $ - $$
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