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doc/oops-tracing: add Code: decode info

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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 <[email protected]>
Cc: Andi Kleen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Randy Dunlap 2007-07-15 23:41:15 -07:00 • committed by Linus Torvalds
commit dcecc6c700
2 changed files with 65 additions and 0 deletions
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14
Documentation/oops-tracing.txt
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@ -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