ARC: entry: EV_Trap expects r10 (vs. r9) to have exception cause

avoids 1 MOV instruction in light of double load/store code

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

diff --git a/arch/arc/include/asm/entry-arcv2.h b/arch/arc/include/asm/entry-arcv2.h
index 0733752..f5ae394 100644 (file)
--- 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 66ba1bf..66a2923 100644 (file)
--- a/arch/arc/include/asm/entry-compact.h
+++ b/arch/arc/include/asm/entry-compact.h
@@ -195,8 +195,8 @@
        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-compact.S b/arch/arc/kernel/entry-compact.S
index 7fe5988..5cb0cd7 100644 (file)
--- a/arch/arc/kernel/entry-compact.S
+++ b/arch/arc/kernel/entry-compact.S
@@ -256,7 +256,7 @@ ENTRY(EV_TLBProtV)
 
        EXCEPTION_PROLOGUE
 
-       mov r2, r9      ; ECR set into r9 already
+       mov r2, r10     ; ECR set into r10 already
        lr  r0, [efa]   ; Faulting Data address (not part of pt_regs saved above)
 
        ; Exception auto-disables further Intr/exceptions.

diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S
index a2bfacb..72be012 100644 (file)
--- a/arch/arc/kernel/entry.S
+++ b/arch/arc/kernel/entry.S
@@ -232,8 +232,8 @@ 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