On Wed, Apr 12, 2006 at 09:22:49AM +0200, Alessandro Coppelli wrote:
> Hi to all.
> I am interested to developing a little
> assembly language programs.
>
> I rode the article written by Thomas Sommers
> ( http://user.nj.net/~tms/hello.html )
> I followed author's instructions but at the end of compilation
>
> as -o <name>.o <name>.s
> ld -o <name> <name>.o
>
> what I have is
>
> #./<name>
> #ksh: Operation not permitted
>
>
> Someone knows what is happenig ?
>
> Ale
>
>
Yes, your file is not recognized as valid OpenBSD ELF executable.
Try this:
-- 8< -- (hello.s)
section .text
global _start
msg db "Hello, world!",0xa
len equ $ - msg
_syscall:
int 0x80
ret
_start:
push dword len
push dword msg
push dword 1 ; stdout
mov eax,0x4 ; write
call _syscall
add esp,12
push dword 0
mov eax,0x1
call _syscall
Valid OpenBSD elf header :)
-- 8< -- (obsd-elf.s)
.section ".note.openbsd.ident", "a"
.p2align 2
.long 8
.long 4
.long 1
.ascii "OpenBSD\0"
.long 0
.p2align 2
Compile and link it...
$ as obsd-elf.s -o obsd-elf.o
$ nasm -f elf -o hello.o hello.s
$ ld -s -o hello hello.o obsd-elf.o
$ ./hello
Hello, world!
Tobias
