From 499b2ea11ff00c624d63af23516404fa2156639a Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Sat, 14 Jan 2006 16:18:09 +0000 Subject: [PATCH] [ARM] 3103/1: ARM EABI: stack pointer must be 64-bit aligned (part 2) Patch from Nicolas Pitre We must make sure that assembly code that modifies the stack pointer before calling a C function does it so it remains 64-bit aligned. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/kernel/semaphore.c | 17 +++++++++-------- arch/arm/lib/lib1funcs.S | 4 ++-- 2 files changed, 11 insertions(+), 10 deletions(-) diff --git a/arch/arm/kernel/semaphore.c b/arch/arm/kernel/semaphore.c index 4c31f29230..981fe5c6cc 100644 --- a/arch/arm/kernel/semaphore.c +++ b/arch/arm/kernel/semaphore.c @@ -177,41 +177,42 @@ int __down_trylock(struct semaphore * sem) * ip contains the semaphore pointer on entry. Save the C-clobbered * registers (r0 to r3 and lr), but not ip, as we use it as a return * value in some cases.. + * To remain AAPCS compliant (64-bit stack align) we save r4 as well. */ asm(" .section .sched.text,\"ax\",%progbits \n\ .align 5 \n\ .globl __down_failed \n\ __down_failed: \n\ - stmfd sp!, {r0 - r3, lr} \n\ + stmfd sp!, {r0 - r4, lr} \n\ mov r0, ip \n\ bl __down \n\ - ldmfd sp!, {r0 - r3, pc} \n\ + ldmfd sp!, {r0 - r4, pc} \n\ \n\ .align 5 \n\ .globl __down_interruptible_failed \n\ __down_interruptible_failed: \n\ - stmfd sp!, {r0 - r3, lr} \n\ + stmfd sp!, {r0 - r4, lr} \n\ mov r0, ip \n\ bl __down_interruptible \n\ mov ip, r0 \n\ - ldmfd sp!, {r0 - r3, pc} \n\ + ldmfd sp!, {r0 - r4, pc} \n\ \n\ .align 5 \n\ .globl __down_trylock_failed \n\ __down_trylock_failed: \n\ - stmfd sp!, {r0 - r3, lr} \n\ + stmfd sp!, {r0 - r4, lr} \n\ mov r0, ip \n\ bl __down_trylock \n\ mov ip, r0 \n\ - ldmfd sp!, {r0 - r3, pc} \n\ + ldmfd sp!, {r0 - r4, pc} \n\ \n\ .align 5 \n\ .globl __up_wakeup \n\ __up_wakeup: \n\ - stmfd sp!, {r0 - r3, lr} \n\ + stmfd sp!, {r0 - r4, lr} \n\ mov r0, ip \n\ bl __up \n\ - ldmfd sp!, {r0 - r3, pc} \n\ + ldmfd sp!, {r0 - r4, pc} \n\ "); EXPORT_SYMBOL(__down_failed); diff --git a/arch/arm/lib/lib1funcs.S b/arch/arm/lib/lib1funcs.S index 59026029d0..4964e5bafa 100644 --- a/arch/arm/lib/lib1funcs.S +++ b/arch/arm/lib/lib1funcs.S @@ -306,9 +306,9 @@ ENTRY(__modsi3) Ldiv0: - str lr, [sp, #-4]! + str lr, [sp, #-8]! bl __div0 mov r0, #0 @ About as wrong as it could be. - ldr pc, [sp], #4 + ldr pc, [sp], #8 -- 2.39.5