how to read it in ASM...

#1
kiddies

Posted 19 September 2009 - 09:11 AM

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130 posts

hello brother..

how to read it in ASM...i ve syscall table but i dont understand how to use n read it

Linux System Call Table

help me to read it...

thanks

#2
Guest_h4x_*

Posted 20 September 2009 - 05:58 AM

Guests

example, you want to call sys_fork:

mov eax,2
mov ebx,0
mov ecx,0
mov edx,0
mov esi,0
mov edi,0
int 80h

and there is no 'esx'

Edited by Jaan, 21 September 2009 - 08:45 AM.
Please use code tags when you are posting your codes !

#3
kiddies

Posted 20 September 2009 - 07:49 AM

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130 posts

give the explanation of the code...couse i understand syscall for exit with explanation of code ASM, thank for reply...

#4
Guest_h4x_*

Posted 20 September 2009 - 08:14 AM

Guests

what you dont understand?
only sucky thing about that table is that i dont know if pointer is in, out or both.

you pass arguments on registers.

#5
kiddies

Posted 20 September 2009 - 08:26 AM

Programmer

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130 posts

like sys_exit

xor eax, eax //its make null of register

like that, give the explanation for it, couse im new understanding ASM

#6
Guest_h4x_*

Posted 20 September 2009 - 09:49 AM

Guests

so first of all you should get fasm. i dont know what your using, but get fasm.
mov = copy data from 2nd operand to first.
mov can specify (1 operand) reg, mem, and 2nd reg, mem, and imm value.

int 80h is interrupt, cpu will call proper function to handle it. in lunix its ring0 window, for safe memory managment.

i dont know what else u want to know, just ask.