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Date: Wed, 29 Oct 2008 12:20:02 -0700
From: Arjan van de Ven <arjan@...radead.org>
To: Américo Wang <xiyou.wangcong@...il.com>
Cc: rdunlap@...otime.net, akpm@...ux-foundation.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts: improve the decodecode script
On Wed, 29 Oct 2008 17:22:26 +0000
Américo Wang <xiyou.wangcong@...il.com> wrote:
> On Wed, Oct 29, 2008 at 10:00:45AM -0700, Arjan van de Ven wrote:
> >From 80bf813c2bdc3538d823bb59c2611b40673e395a Mon Sep 17 00:00:00
> >2001 From: Arjan van de Ven <arjan@...ux.intel.com>
> >Date: Wed, 29 Oct 2008 09:57:07 -0700
> >Subject: [PATCH] scripts: improve the decodecode script
> >
> >kerneloops.org has been using an improved "decodecode" script,
> >specifically it has a special marker that shows which line
> >in the assembly the oops happened at, like this:
> >
> > 20: 83 e0 03 and $0x3,%eax
> > 23: 09 d8 or %ebx,%eax
> > 25: 85 db test %ebx,%ebx
> > 27: 89 02 mov %eax,(%edx)
> > 29: 74 0f je 0x3a
> > 2b:* 3b 73 04 cmp 0x4(%ebx),%esi
> > <-- trapping instruction 2e: 75 05
> > jne 0x35 30: 89 53 04 mov
> > %edx,0x4(%ebx) 33: eb 07 jmp 0x3c
> > 35: 89 53 08 mov %edx,0x8(%ebx)
> >
> >this patch updates the kernel copy to also have this functionality.
> >
> >Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
> >---
> > scripts/decodecode | 32 ++++++++++++++++++++++----------
> > 1 files changed, 22 insertions(+), 10 deletions(-)
> >
> >diff --git a/scripts/decodecode b/scripts/decodecode
> >index 235d393..dd9bf17 100755
> >--- a/scripts/decodecode
> >+++ b/scripts/decodecode
> >@@ -7,7 +7,7 @@
> > # AFLAGS=--32 decodecode < 386.oops
> >
> > cleanup() {
> >- rm -f $T $T.s $T.o
> >+ rm -f $T $T.s $T.o $T.oo $T.aa $T.aaa
> > exit 1
> > }
> >
> >@@ -44,21 +44,33 @@ if [ $marker -eq 0 ]; then
> > marker=`expr index "$code" "\("`
> > fi
> >
> >+touch $T.oo
> > if [ $marker -ne 0 ]; then
> >- beforemark=`echo "$code" | cut -c-$((${marker} - 1))`
> >+ echo All code >> $T.oo
> >+ echo ======== >> $T.oo
> >+ beforemark=`echo "$code"`
> > echo -n " .byte 0x" > $T.s
> >- echo $beforemark | sed -e 's/ /,0x/g' >> $T.s
> >- as $AFLAGS -o $T.o $T.s
> >- objdump -S $T.o
> >- rm $T.o $T.s
> >+ echo $beforemark | sed -e 's/ /,0x/g' | sed -e 's/<//g' |
> >sed -e 's/>//g' >> $T.s
> >+ as $AFLAGS -o $T.o $T.s &> /dev/null
> >+ objdump -S $T.o | grep -v "/tmp" | grep -v "Disassembly" |
> >grep -v "\.text" | grep -v "^$" &> $T.ooo
> >+ cat $T.ooo >> $T.oo
> >+ rm -f $T.o $T.s $T.ooo
> >
> > # and fix code at-and-after marker
> > code=`echo "$code" | cut -c$((${marker} + 1))-`
> > fi
> >-
> >+echo Code starting with the faulting instruction > $T.aa
> >+echo =========================================== >> $T.aa
> > code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g'`
> > echo -n " .byte 0x" > $T.s
> > echo $code >> $T.s
> >-as $AFLAGS -o $T.o $T.s
> >-objdump -S $T.o
> >-rm $T $T.s $T.o
> >+as $AFLAGS -o $T.o $T.s &> /dev/null
> >+objdump -S $T.o | grep -v "Disassembly" | grep -v "/tmp" | grep -v
> >"\.text" | grep -v "^$" &> $T.aaa +cat $T.aaa >> $T.aa
> >+
> >+faultline=`cat $T.aaa | head -1 | cut -d":" -f2`
> >+
> >+cat $T.oo | sed -e "s/\($faultline\)/\*\1 <-- trapping
> >instruction/g" +echo
> >+cat $T.aa
> >+rm -f $T.o $T.s $T $T.oo $T.aa $T.aaa[5~
>
> what is $T.aaa[5~ ? :-)
>
> And why not call cleanup() here?
good point
update below
>From 232b53efebc0bdba0be17dd0a695494faf3fdb60 Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <arjan@...ux.intel.com>
Date: Wed, 29 Oct 2008 09:57:07 -0700
Subject: [PATCH] scripts: improve the decodecode script
kerneloops.org has been using an improved "decodecode" script,
specifically it has a special marker that shows which line
in the assembly the oops happened at, like this:
20: 83 e0 03 and $0x3,%eax
23: 09 d8 or %ebx,%eax
25: 85 db test %ebx,%ebx
27: 89 02 mov %eax,(%edx)
29: 74 0f je 0x3a
2b:* 3b 73 04 cmp 0x4(%ebx),%esi <-- trapping instruction
2e: 75 05 jne 0x35
30: 89 53 04 mov %edx,0x4(%ebx)
33: eb 07 jmp 0x3c
35: 89 53 08 mov %edx,0x8(%ebx)
this patch updates the kernel copy to also have this functionality.
Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
---
scripts/decodecode | 32 ++++++++++++++++++++++----------
1 files changed, 22 insertions(+), 10 deletions(-)
diff --git a/scripts/decodecode b/scripts/decodecode
index 235d393..4b00647 100755
--- a/scripts/decodecode
+++ b/scripts/decodecode
@@ -7,7 +7,7 @@
# AFLAGS=--32 decodecode < 386.oops
cleanup() {
- rm -f $T $T.s $T.o
+ rm -f $T $T.s $T.o $T.oo $T.aa $T.aaa
exit 1
}
@@ -44,21 +44,33 @@ if [ $marker -eq 0 ]; then
marker=`expr index "$code" "\("`
fi
+touch $T.oo
if [ $marker -ne 0 ]; then
- beforemark=`echo "$code" | cut -c-$((${marker} - 1))`
+ echo All code >> $T.oo
+ echo ======== >> $T.oo
+ beforemark=`echo "$code"`
echo -n " .byte 0x" > $T.s
- echo $beforemark | sed -e 's/ /,0x/g' >> $T.s
- as $AFLAGS -o $T.o $T.s
- objdump -S $T.o
- rm $T.o $T.s
+ echo $beforemark | sed -e 's/ /,0x/g' | sed -e 's/<//g' | sed -e 's/>//g' >> $T.s
+ as $AFLAGS -o $T.o $T.s &> /dev/null
+ objdump -S $T.o | grep -v "/tmp" | grep -v "Disassembly" | grep -v "\.text" | grep -v "^$" &> $T.ooo
+ cat $T.ooo >> $T.oo
+ rm -f $T.o $T.s $T.ooo
# and fix code at-and-after marker
code=`echo "$code" | cut -c$((${marker} + 1))-`
fi
-
+echo Code starting with the faulting instruction > $T.aa
+echo =========================================== >> $T.aa
code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g'`
echo -n " .byte 0x" > $T.s
echo $code >> $T.s
-as $AFLAGS -o $T.o $T.s
-objdump -S $T.o
-rm $T $T.s $T.o
+as $AFLAGS -o $T.o $T.s &> /dev/null
+objdump -S $T.o | grep -v "Disassembly" | grep -v "/tmp" | grep -v "\.text" | grep -v "^$" &> $T.aaa
+cat $T.aaa >> $T.aa
+
+faultline=`cat $T.aaa | head -1 | cut -d":" -f2`
+
+cat $T.oo | sed -e "s/\($faultline\)/\*\1 <-- trapping instruction/g"
+echo
+cat $T.aa
+cleanup
--
1.5.5.1
--
Arjan van de Ven Intel Open Source Technology Centre
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