minix/kernel/system/old/do_getsp.c
2005-04-21 14:53:53 +00:00

32 lines
863 B
C

/* The system call implemented in this file:
* m_type: SYS_GETSP
*
* The parameters for this system call are:
* m1_i1: PR_PROC_NR (process to get stack pointer of)
* m1_p1: PR_STACK_PTR (return stack pointer here)
*
* Author:
* Jorrit N. Herder <jnherder@cs.vu.nl>
*/
#include "../kernel.h"
#include "../system.h"
INIT_ASSERT
/*===========================================================================*
* do_getsp *
*===========================================================================*/
PUBLIC int do_getsp(m_ptr)
register message *m_ptr; /* pointer to request message */
{
/* Handle sys_getsp(). MM wants to know what sp is. */
register struct proc *rp;
rp = proc_addr(m_ptr->PR_PROC_NR);
assert(isuserp(rp));
m_ptr->PR_STACK_PTR = (char *) rp->p_reg.sp; /* return sp here (bad type) */
return(OK);
}