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

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

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2019-05-15 16:08:10 -07:00
parent a4880801a7
commit 68e5c6f073
4 changed files with 6 additions and 7 deletions
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3
arch/arc/include/asm/entry-arcv2.h
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@ -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
/*------------------------------------------------------------------------

4
arch/arc/include/asm/entry-compact.h
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@ -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
/*--------------------------------------------------------------

2
arch/arc/kernel/entry-compact.S
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@ -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.

4
arch/arc/kernel/entry.S
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@ -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