linux-kernel - [PATCH 3.10 036/139] MIPS: Actually decode JALX in `__compute_return_epc_for

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Message-Id: <1509571159-4405-37-git-send-email-w@1wt.eu>
Date:   Wed,  1 Nov 2017 22:17:36 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     "Maciej W. Rozycki" <macro@...tec.com>,
        James Hogan <james.hogan@...tec.com>,
        linux-mips@...ux-mips.org, Ralf Baechle <ralf@...ux-mips.org>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 036/139] MIPS: Actually decode JALX in `__compute_return_epc_for_insn'

From: "Maciej W. Rozycki" <macro@...tec.com>

commit a9db101b735a9d49295326ae41f610f6da62b08c upstream.

Complement commit fb6883e5809c ("MIPS: microMIPS: Support handling of
delay slots.") and actually decode the regular MIPS JALX major
instruction opcode, the handling of which has been added with the said
commit for EPC calculation in `__compute_return_epc_for_insn'.

Fixes: fb6883e5809c ("MIPS: microMIPS: Support handling of delay slots.")
Signed-off-by: Maciej W. Rozycki <macro@...tec.com>
Cc: James Hogan <james.hogan@...tec.com>
Cc: linux-mips@...ux-mips.org
Cc: stable@...r.kernel.org 
Patchwork: https://patchwork.linux-mips.org/patch/16394/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 arch/mips/kernel/branch.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/kernel/branch.c b/arch/mips/kernel/branch.c
index 9250996..63b942f 100644
--- a/arch/mips/kernel/branch.c
+++ b/arch/mips/kernel/branch.c
@@ -297,6 +297,7 @@ int __compute_return_epc_for_insn(struct pt_regs *regs,
 	/*
 	 * These are unconditional and in j_format.
 	 */
+	case jalx_op:
 	case jal_op:
 		regs->regs[31] = regs->cp0_epc + 8;
 	case j_op:
-- 
2.8.0.rc2.1.gbe9624a