linking fasm prog to libc using ld?

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ProphetOfDoom

Joined: 08 Aug 2008
Posts: 120
Location: UK

ProphetOfDoom 17 Aug 2009, 22:36

Hi,

I want to write a fasm program that uses libc, and link it with ld. When I try to do this, the linker outputs a binary, but it's impossible to run it. It just says something like 'Bash: no such file or directory'.

I noticed someone had a similar problem ( http://board.flatassembler.net/topic.php?t=9456 ) but no-one posted a satisfactory solution as far as i can see.

I just want to use printf etc, in my fasm program, and link it with ld. It's a linker, it should link, right?

If you can help me you will be my god. Well, almost.

Thanks

17 Aug 2009, 22:36

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 17 Aug 2009, 22:57

What do you get with "readelf {executable file} -l"?

I got this working on a 32-bit Debian:

Code:

; compile the source with commands like:
;   fasm printf.asm
;   ld printf.o -dynamic-linker /lib/ld-linux.so.2 -lc


format ELF

section '.text' executable

 public _start
 extrn printf
 extrn getpid
 extrn _exit

_start:
        call    getpid
        push    eax
        push    msg
        call    printf
        push    0
        call    _exit

section '.data' writeable
 msg db "Current process ID is %d.", 0xA,0

(It is the libcdemo example modified to not need gcc to link).

17 Aug 2009, 22:57

ProphetOfDoom

Joined: 08 Aug 2008
Posts: 120
Location: UK

ProphetOfDoom 17 Aug 2009, 23:11

thanks soooo much Loco! your example worked first time. Smile

17 Aug 2009, 23:11

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