├── README.md
└── tiny.asm


/README.md:
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 1 | tiny-elf
 2 | ========
 3 | A very tiny ELF (Executable and Linkable Format) executable, that does exactly the same as
 4 | ```
 5 | int main(void) {
 6 |   return 42;
 7 | }
 8 | ```
 9 | but a 100 times thinner.
10 | 
11 | #### Source ####
12 | 
13 | http://www.muppetlabs.com/~breadbox/software/tiny/teensy.html
14 | 
15 | ([cached version](http://webcache.googleusercontent.com/search?q=cache%3Ahttp%3A%2F%2Fwww.muppetlabs.com%2F~breadbox%2Fsoftware%2Ftiny%2Fteensy.html))
16 | 
17 | #### Run it ####
18 | 
19 | ```
20 | $ nasm -f bin -o a.out tiny.asm
21 | $ chmod +x a.out
22 | $ ./a.out ; echo $?
23 |   42
24 | $ wc -c a.out
25 |   45 a.out
26 | ```
27 | 
28 | #### Credits ####
29 | 
30 | All credits to muppetlabs.com
31 | 


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/tiny.asm:
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 1 | ; tiny.asm
 2 | ; All credits to muppetlabs.com
 3 | ; code from [muppetlabs.com/~breadbox/software/tiny/teensy.html]
 4 | 
 5 | BITS 32
 6 | 
 7 |             org     0x00010000
 8 | 
 9 |             db      0x7F, "ELF"             ; e_ident
10 |             dd      1                                       ; p_type
11 |             dd      0                                       ; p_offset
12 |             dd      $$                                      ; p_vaddr 
13 |             dw      2                       ; e_type        ; p_paddr
14 |             dw      3                       ; e_machine
15 |             dd      _start                  ; e_version     ; p_filesz
16 |             dd      _start                  ; e_entry       ; p_memsz
17 |             dd      4                       ; e_phoff       ; p_flags
18 | _start:
19 |             mov     bl, 42                  ; e_shoff       ; p_align
20 |             xor     eax, eax
21 |             inc     eax                     ; e_flags
22 |             int     0x80
23 |             db      0
24 |             dw      0x34                    ; e_ehsize
25 |             dw      0x20                    ; e_phentsize
26 |             db      1                       ; e_phnum
27 |                                             ; e_shentsize
28 |                                             ; e_shnum
29 |                                             ; e_shstrndx
30 | 
31 | filesize      equ     $ - $$


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