From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
To: <linux-snps-arc@lists.infradead.org>
Cc: <linux-kernel@vger.kernel.org>,
Vineet Gupta <Vineet.Gupta1@synopsys.com>
Subject: [PATCH 3/5] ARCv2: entry: avoid a branch
Date: Fri, 17 May 2019 12:32:06 -0700 [thread overview]
Message-ID: <1558121528-30184-4-git-send-email-vgupta@synopsys.com> (raw)
In-Reply-To: <1558121528-30184-1-git-send-email-vgupta@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
arch/arc/include/asm/entry-arcv2.h | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/arch/arc/include/asm/entry-arcv2.h b/arch/arc/include/asm/entry-arcv2.h
index 3209a6762960..beaf655666cb 100644
--- a/arch/arc/include/asm/entry-arcv2.h
+++ b/arch/arc/include/asm/entry-arcv2.h
@@ -100,12 +100,11 @@
; 2. Upon entry SP is always saved (for any inspection, unwinding etc),
; but on return, restored only if U mode
+ lr r9, [AUX_USER_SP] ; U mode SP
+
mov.nz r9, sp
add.nz r9, r9, SZ_PT_REGS - PT_sp - 4 ; K mode SP
- bnz 1f
- lr r9, [AUX_USER_SP] ; U mode SP
-1:
PUSH r9 ; SP (pt_regs->sp)
PUSH fp
--
2.7.4
next prev parent reply other threads:[~2019-05-17 19:32 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-17 19:32 [PATCH 0/5] Rewrite ARCv2 interrupt/expecption entry code Vineet Gupta
2019-05-17 19:32 ` [PATCH 1/5] ARCv2: entry: comments about hardware auto-save on taken interrupts Vineet Gupta
2019-05-17 19:32 ` [PATCH 2/5] ARCv2: entry: push out the Z flag unclobber from common EXCEPTION_PROLOGUE Vineet Gupta
2019-05-17 19:32 ` Vineet Gupta [this message]
2019-05-17 19:32 ` [PATCH 4/5] ARCv2: entry: rewrite to enable use of double load/stores LDD/STD Vineet Gupta
2019-05-17 19:32 ` [PATCH 5/5] ARC: entry: EV_Trap expects r10 (vs. r9) to have exception cause Vineet Gupta
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