ARM: 7786/1: hyp: fix macro parameterisation

Currently, compare_cpu_mode_with_primary uses a mixture of macro
arguments and hardcoded registers, and does so incorrectly, as it
stores (__boot_cpu_mode_offset | BOOT_CPU_MODE_MISMATCH) to
(__boot_cpu_mode + &__boot_cpu_mode_offset), which could corrupt an
arbitrary portion of memory.

This patch fixes up compare_cpu_mode_with_primary to use the macro
arguments, correctly updating __boot_cpu_mode.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Christoffer Dall <cdall@cs.columbia.edu>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/arm/kernel/hyp-stub.S b/arch/arm/kernel/hyp-stub.S
index 4910232c4833..797b1a6a4906 100644
--- a/arch/arm/kernel/hyp-stub.S
+++ b/arch/arm/kernel/hyp-stub.S
@@ -56,8 +56,8 @@ ENTRY(__boot_cpu_mode)
         ldr     \reg3, [\reg2]
         ldr     \reg1, [\reg2, \reg3]
         cmp     \mode, \reg1            @ matches primary CPU boot mode?
-        orrne   r7, r7, #BOOT_CPU_MODE_MISMATCH
-        strne   r7, [r5, r6]            @ record what happened and give up
+        orrne   \reg1, \reg1, #BOOT_CPU_MODE_MISMATCH
+        strne   \reg1, [\reg2, \reg3]   @ record what happened and give up
         .endm
 
 #else   /* ZIMAGE */