Merge branch 'for-3.3/soc' of git://git.kernel.org/pub/scm/linux/kernel/git/olof/tegra into tegra/soc

2 files changed, 46 insertions, 1 deletions

diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index cf73a7f742dd..0ade0acc1ed9 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -13,7 +13,8 @@ lib-y		:= backtrace.o changebit.o csumipv6.o csumpartial.o   \
                    testchangebit.o testclearbit.o testsetbit.o        \
                    ashldi3.o ashrdi3.o lshrdi3.o muldi3.o             \
                    ucmpdi2.o lib1funcs.o div64.o                      \
-                   io-readsb.o io-writesb.o io-readsl.o io-writesl.o
+                   io-readsb.o io-writesb.o io-readsl.o io-writesl.o  \
+                   call_with_stack.o
 
 mmu-y   := clear_user.o copy_page.o getuser.o putuser.o
 
diff --git a/arch/arm/lib/call_with_stack.S b/arch/arm/lib/call_with_stack.S
new file mode 100644
index 000000000000..916c80f13ae7
--- /dev/null
+++ b/arch/arm/lib/call_with_stack.S
@@ -0,0 +1,44 @@
+/*
+ * arch/arm/lib/call_with_stack.S
+ *
+ * Copyright (C) 2011 ARM Ltd.
+ * Written by Will Deacon <will.deacon@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+/*
+ * void call_with_stack(void (*fn)(void *), void *arg, void *sp)
+ *
+ * Change the stack to that pointed at by sp, then invoke fn(arg) with
+ * the new stack.
+ */
+ENTRY(call_with_stack)
+        str     sp, [r2, #-4]!
+        str     lr, [r2, #-4]!
+
+        mov     sp, r2
+        mov     r2, r0
+        mov     r0, r1
+
+        adr     lr, BSYM(1f)
+        mov     pc, r2
+
+1:      ldr     lr, [sp]
+        ldr     sp, [sp, #4]
+        mov     pc, lr
+ENDPROC(call_with_stack)