From: Nicolas Pitre nicolas.pitre@linaro.org
Commit fac2e57742d9aa3dbe41860280352efda9d5566e upstream
If CONFIG_FRAME_POINTER=y we get the following error:
arch/arm/mach-vexpress/tc2_pm.c: In function 'tc2_pm_down': arch/arm/mach-vexpress/tc2_pm.c:200:1: error: fp cannot be used in asm here
Let's fix that by explicitly preserving r11 on the stack and removing it from the clobber list.
Reported-by: Russell King rmk+kernel@arm.linux.org.uk Reviewed-by: Dave Martin Dave.Martin@arm.com Signed-off-by: Nicolas Pitre nico@linaro.org Signed-off-by: Olof Johansson olof@lixom.net Signed-off-by: Jon Medhurst tixy@linaro.org --- arch/arm/mach-vexpress/dcscb.c | 16 ++++++++++++---- arch/arm/mach-vexpress/tc2_pm.c | 16 ++++++++++++---- 2 files changed, 24 insertions(+), 8 deletions(-)
diff --git a/arch/arm/mach-vexpress/dcscb.c b/arch/arm/mach-vexpress/dcscb.c index df59395..19a7d08 100644 --- a/arch/arm/mach-vexpress/dcscb.c +++ b/arch/arm/mach-vexpress/dcscb.c @@ -145,8 +145,13 @@ static void dcscb_power_down(void) * Let's do it in the safest possible way i.e. with * no memory access within the following sequence * including to the stack. + * + * Note: fp is preserved to the stack explicitly prior doing + * this since adding it to the clobber list is incompatible + * with having CONFIG_FRAME_POINTER=y. */ asm volatile( + "str fp, [sp, #-4]! \n\t" "mrc p15, 0, r0, c1, c0, 0 @ get CR \n\t" "bic r0, r0, #"__stringify(CR_C)" \n\t" "mcr p15, 0, r0, c1, c0, 0 @ set CR \n\t" @@ -157,9 +162,10 @@ static void dcscb_power_down(void) "bic r0, r0, #(1 << 6) @ disable local coherency \n\t" "mcr p15, 0, r0, c1, c0, 1 @ set AUXCR \n\t" "isb \n\t" - "dsb " + "dsb \n\t" + "ldr fp, [sp], #4" : : : "r0","r1","r2","r3","r4","r5","r6","r7", - "r9","r10","r11","lr","memory"); + "r9","r10","lr","memory");
/* * This is a harmless no-op. On platforms with a real @@ -183,6 +189,7 @@ static void dcscb_power_down(void) * Let's do it in the safest possible way as above. */ asm volatile( + "str fp, [sp, #-4]! \n\t" "mrc p15, 0, r0, c1, c0, 0 @ get CR \n\t" "bic r0, r0, #"__stringify(CR_C)" \n\t" "mcr p15, 0, r0, c1, c0, 0 @ set CR \n\t" @@ -193,9 +200,10 @@ static void dcscb_power_down(void) "bic r0, r0, #(1 << 6) @ disable local coherency \n\t" "mcr p15, 0, r0, c1, c0, 1 @ set AUXCR \n\t" "isb \n\t" - "dsb " + "dsb \n\t" + "ldr fp, [sp], #4" : : : "r0","r1","r2","r3","r4","r5","r6","r7", - "r9","r10","r11","lr","memory"); + "r9","r10","lr","memory"); }
__mcpm_cpu_down(cpu, cluster); diff --git a/arch/arm/mach-vexpress/tc2_pm.c b/arch/arm/mach-vexpress/tc2_pm.c index b4b090c..9221903 100644 --- a/arch/arm/mach-vexpress/tc2_pm.c +++ b/arch/arm/mach-vexpress/tc2_pm.c @@ -152,8 +152,13 @@ static void tc2_pm_down(u64 residency) * Let's do it in the safest possible way i.e. with * no memory access within the following sequence * including the stack. + * + * Note: fp is preserved to the stack explicitly prior doing + * this since adding it to the clobber list is incompatible + * with having CONFIG_FRAME_POINTER=y. */ asm volatile( + "str fp, [sp, #-4]! \n\t" "mrc p15, 0, r0, c1, c0, 0 @ get CR \n\t" "bic r0, r0, #"__stringify(CR_C)" \n\t" "mcr p15, 0, r0, c1, c0, 0 @ set CR \n\t" @@ -164,9 +169,10 @@ static void tc2_pm_down(u64 residency) "bic r0, r0, #(1 << 6) @ disable local coherency \n\t" "mcr p15, 0, r0, c1, c0, 1 @ set AUXCR \n\t" "isb \n\t" - "dsb " + "dsb \n\t" + "ldr fp, [sp], #4" : : : "r0","r1","r2","r3","r4","r5","r6","r7", - "r9","r10","r11","lr","memory"); + "r9","r10","lr","memory");
cci_disable_port_by_cpu(mpidr);
@@ -187,6 +193,7 @@ static void tc2_pm_down(u64 residency) * Let's do it in the safest possible way as above. */ asm volatile( + "str fp, [sp, #-4]! \n\t" "mrc p15, 0, r0, c1, c0, 0 @ get CR \n\t" "bic r0, r0, #"__stringify(CR_C)" \n\t" "mcr p15, 0, r0, c1, c0, 0 @ set CR \n\t" @@ -197,9 +204,10 @@ static void tc2_pm_down(u64 residency) "bic r0, r0, #(1 << 6) @ disable local coherency \n\t" "mcr p15, 0, r0, c1, c0, 1 @ set AUXCR \n\t" "isb \n\t" - "dsb " + "dsb \n\t" + "ldr fp, [sp], #4" : : : "r0","r1","r2","r3","r4","r5","r6","r7", - "r9","r10","r11","lr","memory"); + "r9","r10","lr","memory"); }
__mcpm_cpu_down(cpu, cluster);