The patch titled
doc/oops-tracing: add Code: decode info
has been added to the -mm tree. Its filename is
doc-oops-tracing-add-code-decode-info.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: doc/oops-tracing: add Code: decode info
From: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
Add info that the Code: bytes line contains <xy> or (wxyz) in some
architecture oops reports and what that means.
Add a script by Andi Kleen that reads the Code: line from an Oops report
file and generates assembly code from the hex bytes.
Signed-off-by: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/oops-tracing.txt | 14 +++++++++
scripts/decodecode | 47 +++++++++++++++++++++++++++++++
2 files changed, 61 insertions(+)
diff -puN Documentation/oops-tracing.txt~doc-oops-tracing-add-code-decode-info Documentation/oops-tracing.txt
--- a/Documentation/oops-tracing.txt~doc-oops-tracing-add-code-decode-info
+++ a/Documentation/oops-tracing.txt
@@ -86,6 +86,20 @@ stuff are the values reported by the Oop
and do a replace of spaces to "\x" - that's what I do, as I'm too lazy
to write a program to automate this all).
+Alternatively, you can use the shell script in scripts/decodecode.
+Its usage is: decodecode < oops.txt
+
+The hex bytes that follow "Code:" may (in some architectures) have a series
+of bytes that precede the current instruction pointer as well as bytes at and
+following the current instruction pointer. In some cases, one instruction
+byte or word is surrounded by <> or (), as in "<86>" or "(f00d)". These
+<> or () markings indicate the current instruction pointer. Example from
+i386, split into multiple lines for readability:
+
+Code: f9 0f 8d f9 00 00 00 8d 42 0c e8 dd 26 11 c7 a1 60 ea 2b f9 8b 50 08 a1
+64 ea 2b f9 8d 34 82 8b 1e 85 db 74 6d 8b 15 60 ea 2b f9 <8b> 43 04 39 42 54
+7e 04 40 89 42 54 8b 43 04 3b 05 00 f6 52 c0
+
Finally, if you want to see where the code comes from, you can do
cd /usr/src/linux
diff -puN /dev/null scripts/decodecode
--- /dev/null
+++ a/scripts/decodecode
@@ -0,0 +1,47 @@
+#!/bin/sh
+# Disassemble the Code: line in Linux oopses
+# usage: decodecode < oops.file
+
+T=`mktemp`
+code=
+
+while read i ; do
+
+case "$i" in
+*Code:*)
+ code=$i
+ ;;
+esac
+
+done
+
+if [ -z "$code" ]; then
+ exit
+fi
+
+echo $code
+code=`echo $code | sed -e 's/.*Code: //'`
+
+marker=`expr index "$code" "\<"`
+if [ $marker -eq 0 ]; then
+ marker=`expr index "$code" "\("`
+fi
+
+if [ $marker -ne 0 ]; then
+ beforemark=${code:0:$((marker - 1))}
+ echo -n " .byte 0x" > $T.s
+ echo $beforemark | sed -e 's/ /,0x/g' >> $T.s
+ as -o $T.o $T.s
+ objdump -S $T.o
+ rm $T.o $T.s
+
+# and fix code at-and-after marker
+ code=${code:$marker}
+fi
+
+code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g'`
+echo -n " .byte 0x" > $T.s
+echo $code >> $T.s
+as -o $T.o $T.s
+objdump -S $T.o
+rm $T.o $T.s
_
Patches currently in -mm which might be from randy.dunlap@xxxxxxxxxx are
git-acpi.patch
romfs-printk-format-warnings.patch
mtd-use-null-for-pointer.patch
add-pci_try_set_mwi.patch
git-unionfs.patch
git-ipwireless_cs.patch
x86_64-use-null-for-pointer.patch
mm-merge-populate-and-nopage-into-fault-fixes-nonlinear.patch
doc-kernel-parameters-use-x86-32-tag-instead-of-ia-32.patch
add-argv_split-fix.patch
add-common-orderly_poweroff-fix.patch
kconfig-no-strange-misc-devices.patch
afs-drop-explicit-extern.patch
add-printktime-option-deprecate-time.patch
fs-clarify-dummy-member-in-struct.patch
sony-laptop-use-null-for-pointer.patch
hugetlbfs-use-lib-parser-fix-docs.patch
report-that-kernel-is-tainted-if-there-were-an-oops-before.patch
doc-oops-tracing-add-code-decode-info.patch
schedstats-fix-printk-format.patch
kernel-doc-add-tools-doc-in-makefile.patch
kernel-doc-fix-unnamed-struct-union-warning.patch
kernel-doc-strip-c99-comments.patch
kernel-doc-fix-leading-dot-in-man-mode-output.patch
kernel-doc-fix-leading-dot-in-man-mode-output-fix.patch
profile-likely-unlikely-macros.patch
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