linux-kernel - [PATCH 2/2] ARC: gdbserver breakage in Big-Endian configuration #2

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Date:	Tue, 20 Aug 2013 13:38:11 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	<stable@...r.kernel.org>
CC:	<gregkh@...uxfoundation.org>, <noamc@...hip.com>,
	<Anton.Kolesov@...opsys.com>, <linux-kernel@...r.kernel.org>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Subject: [PATCH 2/2] ARC: gdbserver breakage in Big-Endian configuration #2

[Based on mainline commit 352c1d95e3220d0: "ARC: stop using
pt_regs->orig_r8"]

Stop using orig_r8 as it could get clobbered by ST in trap_with_param,
and further it is semantically not needed either.

Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
---
 arch/arc/include/asm/syscall.h | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/arc/include/asm/syscall.h b/arch/arc/include/asm/syscall.h
index 33ab304..29de098 100644
--- a/arch/arc/include/asm/syscall.h
+++ b/arch/arc/include/asm/syscall.h
@@ -18,7 +18,7 @@ static inline long
 syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
 {
 	if (user_mode(regs) && in_syscall(regs))
-		return regs->orig_r8;
+		return regs->r8;
 	else
 		return -1;
 }
@@ -26,8 +26,7 @@ syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
 static inline void
 syscall_rollback(struct task_struct *task, struct pt_regs *regs)
 {
-	/* XXX: I can't fathom how pt_regs->r8 will be clobbered ? */
-	regs->r8 = regs->orig_r8;
+	regs->r0 = regs->orig_r0;
 }
 
 static inline long
-- 
1.8.1.2

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