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Subject[PATCH 5/5] ARC: entry: EV_Trap expects r10 (vs. r9) to have exception cause
Date
avoids 1 MOV instruction in light of double load/store code

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
arch/arc/include/asm/entry-arcv2.h | 3 +--
arch/arc/include/asm/entry-compact.h | 4 ++--
arch/arc/kernel/entry.S | 4 ++--
3 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/arch/arc/include/asm/entry-arcv2.h b/arch/arc/include/asm/entry-arcv2.h
index 0733752ce7fe..f5ae394ebe06 100644
--- a/arch/arc/include/asm/entry-arcv2.h
+++ b/arch/arc/include/asm/entry-arcv2.h
@@ -95,9 +95,8 @@
lr r10, [ecr]
lr r11, [erbta]
ST2 r10, r11, PT_event
- mov r9, r10

- ; OUTPUT: r9 has ECR
+ ; OUTPUT: r10 has ECR expected by EV_Trap
.endm

/*------------------------------------------------------------------------
diff --git a/arch/arc/include/asm/entry-compact.h b/arch/arc/include/asm/entry-compact.h
index 29f3988c9424..98aff149b344 100644
--- a/arch/arc/include/asm/entry-compact.h
+++ b/arch/arc/include/asm/entry-compact.h
@@ -198,8 +198,8 @@
PUSHAX CTOP_AUX_EFLAGS
#endif

- lr r9, [ecr]
- st r9, [sp, PT_event] /* EV_Trap expects r9 to have ECR */
+ lr r10, [ecr]
+ st r10, [sp, PT_event] /* EV_Trap expects r10 to have ECR */
.endm

/*--------------------------------------------------------------
diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S
index 85d9ea4a0acc..730b83ccfbc1 100644
--- a/arch/arc/kernel/entry.S
+++ b/arch/arc/kernel/entry.S
@@ -235,8 +235,8 @@ ENTRY(EV_Trap)
EXCEPTION_PROLOGUE

;============ TRAP 1 :breakpoints
- ; Check ECR for trap with arg (PROLOGUE ensures r9 has ECR)
- bmsk.f 0, r9, 7
+ ; Check ECR for trap with arg (PROLOGUE ensures r10 has ECR)
+ bmsk.f 0, r10, 7
bnz trap_with_param

;============ TRAP (no param): syscall top level
--
2.7.4
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