forked from luck/tmp_suning_uos_patched
ARC: entry.S: micro-optimize Trap handler
Elide the need to re-read ECR in Trap handler by ensuring that EXCEPTION_PROLOGUE does that at the very end just before returning to Trap handler ARCv2 EXCEPTION_PROLOGUE already did that, so same for ARcompact and the common trap handler adjusted to use cached ECR Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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arch/arc
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@ -181,8 +181,6 @@
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/* ARC700 doesn't provide auto-stack switching */
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SWITCH_TO_KERNEL_STK
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lr r9, [ecr]
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st r9, [sp, 8] /* ECR */
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st r0, [sp, 4] /* orig_r0, needed only for sys calls */
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/* Restore r9 used to code the early prologue */
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@ -198,6 +196,9 @@
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PUSHAX lp_end
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PUSHAX lp_start
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PUSHAX erbta
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lr r9, [ecr]
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st r9, [sp, PT_event] /* EV_Trap expects r9 to have ECR */
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.endm
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/*--------------------------------------------------------------
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@ -258,8 +258,8 @@ ENTRY(EV_Trap)
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EXCEPTION_PROLOGUE
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;============ TRAP 1 :breakpoints
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lr r10, [ecr]
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bmsk.f 0, r10, 7
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; Check ECR for trap with arg (PROLOGUE ensures r9 has ECR)
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bmsk.f 0, r9, 7
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bnz trap_with_param
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;============ TRAP (no param): syscall top level
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