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Commit 8111eaa6 authored by Russell King's avatar Russell King
Browse files

ARM: pm: reallocate registers to avoid r2, r3 



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

Acked-by: default avatarFrank Hofmann <frank.hofmann@tomtom.com>
Tested-by: default avatarKevin Hilman <khilman@ti.com>
Acked-by: default avatarJean Pihet <j-pihet@ti.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 5fa94c81

arch/arm/kernel/sleep.S

+9 −9
Original line number Diff line number Diff line
@@ -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