[PATCH 05/25] ARM: pm: reallocate registers to avoid r2, r3

Russell King - ARM Linux
2011-06-22T15:10:11Z

Avoid using r2 and r3 in the suspend code, allowing these to be
passed further into the function as arguments.

Acked-by: Frank Hofmann <frank.hofmann@tomtom.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/kernel/sleep.S | 18 +++++++++---------
1 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S
index 8dbca93..358be13 100644
--- a/arch/arm/kernel/sleep.S
+++ b/arch/arm/kernel/sleep.S
@@ -20,26 +20,26 @@ ENTRY(cpu_suspend)
mov r9, lr
#ifdef MULTI_CPU
ldr r10, =processor
- ldr r0, [r10, #CPU_SLEEP_SIZE] @ size of CPU sleep state
+ ldr r5, [r10, #CPU_SLEEP_SIZE] @ size of CPU sleep state
ldr ip, [r10, #CPU_DO_RESUME] @ virtual resume function
#else
- ldr r0, =cpu_suspend_size
+ ldr r5, =cpu_suspend_size
ldr ip, =cpu_do_resume
#endif
- mov r2, sp @ current virtual SP
- sub sp, sp, r0 @ allocate CPU state on stack
+ mov r6, sp @ current virtual SP
+ sub sp, sp, r5 @ allocate CPU state on stack
mov r0, sp @ save pointer
add ip, ip, r1 @ convert resume fn to phys
- stmfd sp!, {r1, r2, ip} @ save v:p, virt SP, phys resume fn
- ldr r3, =sleep_save_sp
- add r2, sp, r1 @ convert SP to phys
+ stmfd sp!, {r1, r6, ip} @ save v:p, virt SP, phys resume fn
+ ldr r5, =sleep_save_sp
+ add r6, sp, r1 @ convert SP to phys
#ifdef CONFIG_SMP
ALT_SMP(mrc p15, 0, lr, c0, c0, 5)
ALT_UP(mov lr, #0)
and lr, lr, #15
- str r2, [r3, lr, lsl #2] @ save phys SP
+ str r6, [r5, lr, lsl #2] @ save phys SP
#else
- str r2, [r3] @ save phys SP
+ str r6, [r5] @ save phys SP
#endif
#ifdef MULTI_CPU
mov lr, pc
--
1.7.4.4