Messages in this thread Patch in this message | | | Date | Fri, 22 Jun 2007 13:28:10 -0700 | From | Randy Dunlap <> | Subject | [PATCH v3] doc/oops-tracing: add Code: decode info |
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From: Randy Dunlap <randy.dunlap@oracle.com>
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@oracle.com> --- Documentation/oops-tracing.txt | 14 ++++++++++++ scripts/decodecode | 47 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 61 insertions(+)
--- linux-2.6.22-rc5.orig/Documentation/oops-tracing.txt +++ linux-2.6.22-rc5/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 --- /dev/null +++ linux-2.6.22-rc5/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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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