[PATCH 21/25] ARM: pm: omap34xx: no need to save all registers in sleep34xx.S

Russell King - ARM Linux
2011-06-23T19:16:17Z

The ABI allows called functions to corrupt r0-r3 and ip (r12). So
its pointless saving these registers in the suspend code - the
calling function will expect them to be corrupted and so won't rely
on their contents after resume.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/mach-omap2/sleep34xx.S | 10 +++++-----
1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach-omap2/sleep34xx.S
index 63f1066..9551c7d 100644
--- a/arch/arm/mach-omap2/sleep34xx.S
+++ b/arch/arm/mach-omap2/sleep34xx.S
@@ -133,7 +133,7 @@ ENDPROC(enable_omap3630_toggle_l2_on_restore)
/* Function to call rom code to save secure ram context */
.align 3
ENTRY(save_secure_ram_context)
- stmfd sp!, {r1-r12, lr} @ save registers on stack
+ stmfd sp!, {r4 - r11, lr} @ save registers on stack
adr r3, api_params @ r3 points to parameters
str r0, [r3,#0x4] @ r0 has sdram address
ldr r12, high_mask
@@ -152,7 +152,7 @@ ENTRY(save_secure_ram_context)
nop
nop
nop
- ldmfd sp!, {r1-r12, pc}
+ ldmfd sp!, {r4 - r11, pc}
.align
sram_phy_addr_mask:
.word SRAM_BASE_P
@@ -187,7 +187,7 @@ ENTRY(save_secure_ram_context_sz)
*/
.align 3
ENTRY(omap34xx_cpu_suspend)
- stmfd sp!, {r0-r12, lr} @ save registers on stack
+ stmfd sp!, {r4 - r11, lr} @ save registers on stack

/*
* r0 contains CPU context save/restore pointer in sdram
@@ -329,7 +329,7 @@ omap3_do_wfi:
* == Exit point from non-OFF modes ==
* ===================================
*/
- ldmfd sp!, {r0-r12, pc} @ restore regs and return
+ ldmfd sp!, {r4 - r11, pc} @ restore regs and return

/*
@@ -572,7 +572,7 @@ usettbr0:
* ==============================
*/
restoremmu_on:
- ldmfd sp!, {r0-r12, pc} @ restore regs and return
+ ldmfd sp!, {r4 - r11, pc} @ restore regs and return

/*
--
1.7.4.4