diff options
Diffstat (limited to 'arch/arm/lib')
-rw-r--r-- | arch/arm/lib/Makefile | 3 | ||||
-rw-r--r-- | arch/arm/lib/call_with_stack.S | 44 |
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 | ||
18 | mmu-y := clear_user.o copy_page.o getuser.o putuser.o | 19 | mmu-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 | */ | ||
30 | ENTRY(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 | |||
41 | 1: ldr lr, [sp] | ||
42 | ldr sp, [sp, #4] | ||
43 | mov pc, lr | ||
44 | ENDPROC(call_with_stack) | ||