linux-kernel - [ 06/74] ARC: gdbserver breakage in Big-Endian configuration #2

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Date:	Mon, 26 Aug 2013 18:08:04 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, <stable@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Vineet Gupta <vgupta@...opsys.com>
Subject: [ 06/74] ARC: gdbserver breakage in Big-Endian configuration #2

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vineet Gupta <Vineet.Gupta1@...opsys.com>

[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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arc/include/asm/syscall.h |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- 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,
 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


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