.global task_pusha

task_pusha:

    pushf
    push $0x8	   // code segment
    push $userfunc

    push $0x666

    pusha

    push %ds
    push %es
    push %fs
    push %gs

	/*

	now stack looks like:

	param			 // esp+68
	returnaddy		

	eflags			
	code segment		
	userfunc		

	0x666

	eax // rest by popa	
	ecx			
	edx			
	ebx			
	esp			
	ebp			
	esi			
	edi			

	ds
	es
	fs
	gs

	*/

    mov 68(%esp),%eax // get address of alternative stack where we want to simulate the pusha

    mov (%esp),%ecx
    mov %ecx,(%eax)

    mov 4(%esp),%ecx
    mov %ecx,4(%eax)

    mov 8(%esp),%ecx
    mov %ecx,8(%eax)

    mov 12(%esp),%ecx
    mov %ecx,12(%eax)

    mov 16(%esp),%ecx
    mov %ecx,16(%eax)

    mov 20(%esp),%ecx
    mov %ecx,20(%eax)

    mov 24(%esp),%ecx
    mov %ecx,24(%eax)

    mov 28(%esp),%ecx
    mov %ecx,28(%eax)

    mov 32(%esp),%ecx
    mov %ecx,32(%eax)

    mov 36(%esp),%ecx
    mov %ecx,36(%eax)

    mov 40(%esp),%ecx
    mov %ecx,40(%eax)

    mov 44(%esp),%ecx
    mov %ecx,44(%eax)

    mov 48(%esp),%ecx
    mov %ecx,48(%eax)

    mov 52(%esp),%ecx
    mov %ecx,52(%eax)

    mov 56(%esp),%ecx
    mov %ecx,56(%eax)

    mov 60(%esp),%ecx
    mov %ecx,60(%eax)

    pop %gs
    pop %fs
    pop %es
    pop %ds

    popa

    pop %eax
    pop %eax
    pop %eax
    pop %eax

    ret