ARM: move PC value into r9
Move the saved PC value into r9, thereby moving it into a caller-saved
register for functions that we may call during the entry to a syscall.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 374c287..1b3fc79 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -28,7 +28,13 @@
#include "entry-header.S"
saved_psr .req r8
+#if defined(CONFIG_TRACE_IRQFLAGS) || defined(CONFIG_CONTEXT_TRACKING)
+saved_pc .req r9
+#define TRACE(x...) x
+#else
saved_pc .req lr
+#define TRACE(x...)
+#endif
.align 5
#if !(IS_ENABLED(CONFIG_TRACE_IRQFLAGS) || IS_ENABLED(CONFIG_CONTEXT_TRACKING))
@@ -144,6 +150,7 @@
THUMB( mov r8, sp )
THUMB( store_user_sp_lr r8, r10, S_SP ) @ calling sp, lr
mrs saved_psr, spsr @ called from non-FIQ mode, so ok.
+ TRACE( mov saved_pc, lr )
str saved_pc, [sp, #S_PC] @ Save calling PC
str saved_psr, [sp, #S_PSR] @ Save CPSR
str r0, [sp, #S_OLD_R0] @ Save OLD_R0