linux-kernel - [PATCH] objtool: fix iret's opcode

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Message-Id: <20170118132921.19319-1-jslaby@suse.cz>
Date:   Wed, 18 Jan 2017 14:29:21 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     mingo@...nel.org
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Jiri Slaby <jslaby@...e.cz>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: [PATCH] objtool: fix iret's opcode

iret is 0xcf according to the Intel manual and also to objdump of my
vmlinux:
    1ea8:       48 cf                   iretq

Fix the opcode in arch_decode_instruction.

The previous value (0xc5) seems to correspond to lds.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>
---
 tools/objtool/arch/x86/decode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c
index 5e0dea2cdc01..039636ffb6c8 100644
--- a/tools/objtool/arch/x86/decode.c
+++ b/tools/objtool/arch/x86/decode.c
@@ -150,9 +150,9 @@ int arch_decode_instruction(struct elf *elf, struct section *sec,
 		*type = INSN_RETURN;
 		break;
 
-	case 0xc5: /* iret */
 	case 0xca: /* retf */
 	case 0xcb: /* retf */
+	case 0xcf: /* iret */
 		*type = INSN_CONTEXT_SWITCH;
 		break;
 
-- 
2.11.0