Module Name: src
Committed By: matt
Date: Sat Mar 24 17:52:35 UTC 2012
Modified Files:
src/sys/arch/powerpc/powerpc: vm_machdep.c
Log Message:
When a stack is specified, make sure the stack has enough for a previous
callframe in which the LR can be stored. (atf test t_clone:clone_basic
now passes).
To generate a diff of this commit:
cvs rdiff -u -r1.95 -r1.96 src/sys/arch/powerpc/powerpc/vm_machdep.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/powerpc/powerpc/vm_machdep.c
diff -u src/sys/arch/powerpc/powerpc/vm_machdep.c:1.95 src/sys/arch/powerpc/powerpc/vm_machdep.c:1.96
--- src/sys/arch/powerpc/powerpc/vm_machdep.c:1.95 Sun Feb 19 21:06:25 2012
+++ src/sys/arch/powerpc/powerpc/vm_machdep.c Sat Mar 24 17:52:35 2012
@@ -1,4 +1,4 @@
-/* $NetBSD: vm_machdep.c,v 1.95 2012/02/19 21:06:25 rmind Exp $ */
+/* $NetBSD: vm_machdep.c,v 1.96 2012/03/24 17:52:35 matt Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
@@ -32,7 +32,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.95 2012/02/19 21:06:25 rmind Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.96 2012/03/24 17:52:35 matt Exp $");
#include "opt_altivec.h"
#include "opt_multiprocessor.h"
@@ -108,10 +108,13 @@ cpu_lwp_fork(struct lwp *l1, struct lwp
*l2->l_md.md_utf = *l1->l_md.md_utf;
/*
- * If specified, give the child a different stack.
+ * If specified, give the child a different stack. Make sure to
+ * reserve enough at the top to store the previous LR.
*/
if (stack != NULL) {
- l2->l_md.md_utf->tf_fixreg[1] = (register_t)stack + stacksize;
+ l2->l_md.md_utf->tf_fixreg[1] =
+ ((register_t)stack + stacksize - STACK_ALIGNBYTES)
+ & ~STACK_ALIGNBYTES;
}
/*
