System Call \"Hello World\" on Mac OS X. Please tell me how to do it in my mac,

ID: 3915766 • Letter: S

Question

System Call "Hello World" on Mac OS X. Please tell me how to do it in my mac, I've tried so many things.

Incorporate a new system call into the kernel thereby expanding the functionality of the operating system.

Step 1: Build the environment (Mac OS)

Step 2: Building a new kernel (Learn how to configure, compile, and install the kernel binary.)

Step 3: Extending the Kernel Source

Step 4: Adding a System Call to the Kernel

include <linuxllinkage.h>

include <linuxlkernel.h>

asmlinkage int sysJhelloworld() { printk(KERN_EMERG "hello world!"); return 1; }

Step 5: Using the System Call from a User Program

include <linux/errno.h>

include <sys/syscall.h>

include <linux/unistd.h>

_syscallO(int, helloworld); main() { helloworld(); }

.data

hello: .ascii "Hello, World! "

len: .short len - hello

.text

.globl _start

_start:

mov $4,%eax # system call number (sys_write)

mov $1,%ebx # first argument: file handle (stdout)

lea hello,%ecx # second argument: pointer to message to write

mov len,%edx # third argument: message length

int $0x80 # call kernel

mov $1,%eax # system call number (sys_exit)

mov $0,%ebx # first argument: exit code

int $0x80 # call kernel

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