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-rw-r--r--arch/arm/lib/Makefile3
-rw-r--r--arch/arm/lib/call_with_stack.S44
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 \
13 testchangebit.o testclearbit.o testsetbit.o \ 13 testchangebit.o testclearbit.o testsetbit.o \
14 ashldi3.o ashrdi3.o lshrdi3.o muldi3.o \ 14 ashldi3.o ashrdi3.o lshrdi3.o muldi3.o \
15 ucmpdi2.o lib1funcs.o div64.o \ 15 ucmpdi2.o lib1funcs.o div64.o \
16 io-readsb.o io-writesb.o io-readsl.o io-writesl.o 16 io-readsb.o io-writesb.o io-readsl.o io-writesl.o \
17 call_with_stack.o
17 18
18mmu-y := clear_user.o copy_page.o getuser.o putuser.o 19mmu-y := clear_user.o copy_page.o getuser.o putuser.o
19 20
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 @@
1/*
2 * arch/arm/lib/call_with_stack.S
3 *
4 * Copyright (C) 2011 ARM Ltd.
5 * Written by Will Deacon <will.deacon@arm.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21#include <linux/linkage.h>
22#include <asm/assembler.h>
23
24/*
25 * void call_with_stack(void (*fn)(void *), void *arg, void *sp)
26 *
27 * Change the stack to that pointed at by sp, then invoke fn(arg) with
28 * the new stack.
29 */
30ENTRY(call_with_stack)
31 str sp, [r2, #-4]!
32 str lr, [r2, #-4]!
33
34 mov sp, r2
35 mov r2, r0
36 mov r0, r1
37
38 adr lr, BSYM(1f)
39 mov pc, r2
40
411: ldr lr, [sp]
42 ldr sp, [sp, #4]
43 mov pc, lr
44ENDPROC(call_with_stack)