linux-kernel - [tip:perf/urgent] x86/kprobes: Fix typo transferred from Intel manual

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Message-ID: <tip-8d973b624ece3b85cfae9474935795d034f72faf@git.kernel.org>
Date:	Mon, 16 Jan 2012 01:02:17 -0800
From:	tip-bot for Ulrich Drepper <drepper@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	masami.hiramatsu.pt@...achi.com, drepper@...il.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/urgent] x86/kprobes:
  Fix typo transferred from Intel manual

Commit-ID:  8d973b624ece3b85cfae9474935795d034f72faf
Gitweb:     http://git.kernel.org/tip/8d973b624ece3b85cfae9474935795d034f72faf
Author:     Ulrich Drepper <drepper@...il.com>
AuthorDate: Sun, 15 Jan 2012 19:40:24 -0500
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 16 Jan 2012 08:20:36 +0100

x86/kprobes: Fix typo transferred from Intel manual

The arch/x86/lib/x86-opcode-map.txt file [used by the
kprobes instruction decoder] contains the line:

  af: SCAS/W/D/Q rAX,Xv

This is what the Intel manuals show, but it's not correct.
The 'X' stands for:

  Memory addressed by the DS:rSI register pair (for example, MOVS, CMPS, OUTS, or LODS).

On the other hand 'Y' means (also see the ae byte entry for
SCASB):

  Memory addressed by the ES:rDI register pair (for example, MOVS, CMPS, INS, STOS, or SCAS).

Signed-off-by: Ulrich Drepper <drepper@...il.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: yrl.pp-manager.tt@...achi.com
Link: http://lkml.kernel.org/r/CAOPLpQfytPyDEBF1Hbkpo7ovUerEsstVGxBr%3DEpDL-BKEMaqLA@mail.gmail.com
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/lib/x86-opcode-map.txt |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/x86/lib/x86-opcode-map.txt b/arch/x86/lib/x86-opcode-map.txt
index a793da5..8641bbb 100644
--- a/arch/x86/lib/x86-opcode-map.txt
+++ b/arch/x86/lib/x86-opcode-map.txt
@@ -210,7 +210,9 @@ ab: STOS/W/D/Q Yv,rAX
 ac: LODS/B AL,Xb
 ad: LODS/W/D/Q rAX,Xv
 ae: SCAS/B AL,Yb
-af: SCAS/W/D/Q rAX,Xv
+# Note: The May 2011 Intel manual shows Xv for the second parameter of the
+# next instruction but Yv is correct
+af: SCAS/W/D/Q rAX,Yv
 # 0xb0 - 0xbf
 b0: MOV AL/R8L,Ib
 b1: MOV CL/R9L,Ib
--
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