[src/trunk]: src/sys/arch/usermode/dev Cleanup syscall context creation

[reinoud <reinoud%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/574f784a488f
branches:  trunk
changeset: 769397:574f784a488f
user:      reinoud <reinoud%NetBSD.org@localhost>
date:      Thu Sep 08 12:37:28 2011 +0000

description:
Cleanup syscall context creation

diffstat:

 sys/arch/usermode/dev/cpu.c |  12 +++++-------
 1 files changed, 5 insertions(+), 7 deletions(-)

diffs (33 lines):

diff -r b0dfcbefc613 -r 574f784a488f sys/arch/usermode/dev/cpu.c
--- a/sys/arch/usermode/dev/cpu.c       Thu Sep 08 12:10:13 2011 +0000
+++ b/sys/arch/usermode/dev/cpu.c       Thu Sep 08 12:37:28 2011 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: cpu.c,v 1.37 2011/09/08 12:10:13 jmcneill Exp $ */
+/* $NetBSD: cpu.c,v 1.38 2011/09/08 12:37:28 reinoud Exp $ */
 
 /*-
  * Copyright (c) 2007 Jared D. McNeill <jmcneill%invisible.ca@localhost>
@@ -30,7 +30,7 @@
 #include "opt_hz.h"
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.37 2011/09/08 12:10:13 jmcneill Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.38 2011/09/08 12:37:28 reinoud Exp $");
 
 #include <sys/param.h>
 #include <sys/conf.h>
@@ -335,11 +335,9 @@
            2, func, arg);
 
        /* set up the ucontext for the syscall */
-       pcb2->pcb_ucp.uc_flags = _UC_CPU;
-       /* hack for it sets the stack anyway!! */
-       pcb2->pcb_syscall_ucp.uc_stack.ss_sp =
-               ((uint8_t *) pcb2->pcb_syscall_ucp.uc_stack.ss_sp) - 4;
-       pcb2->pcb_syscall_ucp.uc_stack.ss_size = 0;
+       pcb2->pcb_syscall_ucp.uc_flags = _UC_CPU;
+       pcb2->pcb_syscall_ucp.uc_link = NULL;
+       pcb2->pcb_syscall_ucp.uc_stack.ss_size = 0;     /* no stack move */
        thunk_makecontext_1(&pcb2->pcb_syscall_ucp, (void (*)(void)) syscall,
            l2);
 }