code_for_integer_printing

code_for_integer_printing

[ssams]

i want to ask about a little code bellow...
i build this code for print some integer value..
i think is easy for doing but after i do some fungtion
below
i did not find ionteger output.
so how is function to do it..?

this is my code, i hope you help me..?
thank's before..

.macro cetak		# macro for printing
	xor %eax,%eax
	mov $1,%ebx
	mov $4,%eax
	int $0x80
.endm
.data
promt1:
	.byte 65
.text
.globl _start
_start:
	mov $promt1,%eax 	#eax will divided
	mov $10,%ebx		#ebx is divident
	xor %ecx,%ecx
ulangi:
	xor %edx,%edx
	div %ebx		#eax : ebx
	push %edx		# save remainder
	inc %ecx
	cmp $0 ,%eax
	jne ulangi

	mov $3,%ecx
ulang_cetak:
	push %ecx
	pop %edx		#take point
	add $0 ,%dl		#convert to ascii
	mov %edx,%ecx		#for printing
	mov $1,%edx
	cetak			#print
	pop %ecx
	dec %ecx
	jnz ulang_cetak

	movl $1,%eax	#exit
	movl $0,%ebx
	int  $0x80
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Re: code_for_integer_printing

[lx]

On Sat, 07 Sep 2002 00:06:03 +0700
"ssams" <ssams@telkom.net> wrote:

	[...]
> ulang_cetak:
> 	push %ecx
> 	pop %edx		#take point
> 	add $0 ,%dl		#convert to ascii

	add $'0,dl
or
	add $48,dl

> 	mov %edx,%ecx		#for printing
> 	mov $1,%edx
> 	cetak			#print
> 	pop %ecx
> 	dec %ecx
> 	jnz ulang_cetak
> 

regards,
	hp

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Re: code_for_integer_printing

[lx]

On Mon, 16 Sep 2002 12:31:26 +0700
"ssams" <ssams@telkom.net> wrote:

i do not re-write the code for you:) but, i hope that my annotations 
will help. i'd suggest you try getting through my syscalls intro at
	http://www.lxhp.in-berlin.de/lhpsyscal.html
but, those syscalls aren't all that simple; try verifying what happens 
by following the rsp. source files. could aid a lot to understanding. 
if you find it difficult to connect to the syscalls pages i could send 
you the complete colletion as an archive, by email or, you might get 
it yourself by
	http://www.lxhp.in-berlin.de/lhpsysc-html.tar.bz2

best,
	hp

> .macro cetak # macro for printing
>  xor %eax,%eax
>  mov $1,%ebx
>  mov $4,%eax
>  int $0x80
>  .endm

essential: syscalls read/write (and many others) always use 
an address of where the data are which you want to operate on
and a count of bytes of the length of that sequence of data.
which for 'read' and 'write' means that with ECX you pass the 
#address# of your text and, with EDX the number of bytes to 
receive or send.

so, for instance, you could modify the macro to
.macro cetak		# all regs but EAX, EBX preserved
	pushl %ecx	# print the register value itself, 
	movl %esp,%ecx	# this is your temporary buffer address
	movl $1,%ebx	# Linux "stdout"
	movl $4,%eax	# sys_write
	int $0x80	# execute...
	cmpl $0xffff0001,%eax # optional: NC in EFLAGS if EAX error code
	popl %ecx	# remove temp buffer = restore stack, and restore ECX
.endm
# or, restore stack, e.g. w.  "addl $4,%esp" which modifies EFLAGS
# or, preserve error flags w. "leal 4(%esp),%esp"
# note that the above error test is valid for #all# syscalls.

btw, you could save typing those "%"s (they are often required if AS used 
for the GCC backend, though) with:
	.att_syntax no_prefix
at top of your assembly text.

>  .data
>  promt1:
>  .byte 65
>  .text
>  .globl _start
>  _start:
>  	mov $promt1,%eax #eax will divided
>  	mov $10,%ebx #ebx is divident
>  	xor %ecx,%ecx
> 
>  ulangi:
>  	xor %edx,%edx
>  	div %ebx #eax : ebx
>  	push %edx # save remainder
>  	inc %ecx
>  	cmp $0 ,%eax
>  	jne ulangi
>  
> 	mov $3,%ecx
> 	 ulang_cetak:
>  	push %ecx
>  	pop %edx #take point
>  	add $48 ,%dl 	#convert to ascii i've try add with $'0' to
> 			#but it same no output with it
>  	mov %edx,%ecx #for printing
>  	mov $1,%edx
>  	cetak #print
>  	pop %ecx
>  	dec %ecx
>  	jnz ulang_cetak
>  
> 	movl $1,%eax #exit
> 	 movl $0,%ebx
> 	int $0x80
> 
>  regards,
>  ssams
>  
> =========================================================================
> Khusus Pelanggan Telepon DIVRE 2, Tekan 166 untuk mendengarkan pesan Anda.
> =========================================================================


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Linux,Assembly,Forth: http://www.lxhp.in-berlin.de/index-lx.shtml en/de