On Nov 12 2006 22:14, Amit Choudhary wrote:
>+*How is it invoked?
>+--A library routine issues a trap to the OS by executing INT 0x80 assembly instruction.
>+--The system call number is passed through the EAX register.
>+--The arguments are passed through registers EBX, ECX, etc.
A nice short description, however, not all of the world runs x86 and may
not know E?X. Just mention that you will describe the process based on
x86.
>+*The Makefile in dir "mycall" will have only one line:
>+
>+#####Makefile Start#####
>+obj-y := mycall.o
>+#####Makefile End#######
I am tempted to use obj-y += mycall.o
Generally, one does not need a new directory for a new syscall, or a new
source file. You can edit kernel/sys.c if you like.
>+--Line 3:
>+ _syscall1(long, mycall, int, i)
>+ This is needed for system calls with 1 argument. It is explained in detail
>+ below.
This was deprecated in favor of syscall().
>+#include<stdio.h>
>+#include "testmycall.h"
>+
>+main()
>+{
>+ printf("%d\n", mycall(15));
>+}
Care to use ANSI C?
-`J'
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