From: Maciej Hrebien <m_hrebien@wp.pl>
To: linux-assembly@vger.kernel.org
Subject: Re: jump_code
Date: Fri, 06 Sep 2002 21:59:22 +0200 [thread overview]
Message-ID: <3D79091A.6D77404F@wp.pl> (raw)
In-Reply-To: web-46559356@m1.plasa.com
You have wrong value in edx register when calling kernel's write
routine!
> I build this code , iget output but i little bug ithink.
> i hope some body be correct it..
>
> .data
> msg1: .ascii "Mencetak Saya\n"
> msg2: .ascii "\nKok saya dilompati sih\n"
> msg2_len: .long .-msg2
> msg3: .ascii "Hai ini pesen ketiga "
> msg3_len: .long .-msg3
>
> .text
> .globl _start
> _start:
> mov $4,%eax
> mov $1,%ebx
> mov $msg1,%ecx
> mov $14,%edx
> int $0x80
>
> jmp pesan3
> pesan2:
> mov $4,%eax
> mov $1,%ebx
> mov $msg2,%ecx
> sub $24,%edx
Change "sub $24,%edx" to "mov msg2_len,%edx".
> int $0x80
>
> mov $1,%eax
> xor %edx,%edx
> xor %ecx,%ecx
> int $0x80
> pesan3:
> mov $3,%ecx
> ulang:
> push %ecx
>
> mov $4,%eax
> mov $1,%ebx
> mov $msg3,%ecx
> sub $21,%edx
Change "sub $21,%edx" to "mov msg3_len,%edx".
> int $0x80
> pop %ecx
> dec %ecx
> jnz ulang
> jmp pesan2
>
> Output
> Mencetak Saya
> Hai ini pesen ketiga
> Hai ini pesen ketiga
> Hai ini pesen ketiga
> Kok saya dilompati sih
> Hai ini pesen ketiga
>
> my questio is ..
> why the third message is printing for one again in the end
> of output
> althought no instruction point it..?
Regards,
--
Maciej Hrebien
prev parent reply other threads:[~2002-09-06 19:59 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-06 17:14 jump_code ssams
2002-09-06 19:59 ` Maciej Hrebien [this message]
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