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authorRandy Dunlap <randy.dunlap@oracle.com>2007-07-15 23:41:15 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 09:05:48 -0700
commitdcecc6c70013e3a5fa81b3081480c03e10670a23 (patch)
treea45c6a35538004732ea4ce130f9fa5db5f8a1bf6 /Documentation/oops-tracing.txt
parent213dd266d48af90c1eec8688c1ff31aa34d21de2 (diff)
downloadlinux-linaro-stable-dcecc6c70013e3a5fa81b3081480c03e10670a23.tar.gz
doc/oops-tracing: add Code: decode info
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> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/oops-tracing.txt')
-rw-r--r--Documentation/oops-tracing.txt14
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/oops-tracing.txt b/Documentation/oops-tracing.txt
index 7d5b60dea551..23e6dde7eea6 100644
--- a/Documentation/oops-tracing.txt
+++ b/Documentation/oops-tracing.txt
@@ -86,6 +86,20 @@ stuff are the values reported by the Oops - you can just cut-and-paste
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