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SubjectA new ksymoops (code inside)
Date

Hello Linuxers.
Since the version of ksymoops released with the official
kernel lacks a few features, and since Greg McGary told me he isn't
maintaining the source, here's a new version of the tool. It's
called "oops.c", but it's customary.

Feel free to send me any complaint, but please include "oops" as a
substring of the subject line.

The new features of the tool are:
- strips syslog prefixes
- every information in the oops appears in the output, so the
oops itselfcan be discarded after decoding
- decodes registers and stack (tries to give symbolic names to them),
in addition to the code
- shows pointers to stack relative to %esp
- uses symbols in modules from /proc/ksyms
- it's in C (I don't know the plusplus stuff).

The remaining bugs and missing features are the following
- doesn't check /proc/ksyms against the map for mismatches
- works if no map is there, using /proc/ksyms alone -- Hmm....
- should have cmdline options to be more/less aggressive
- doesn't check for module bounds -- should use "ksyms -m"
- it'2 x86 only: it doesn't decode the amusing face of sparc oopses

I feel ksymoops most useful for driver (=module) developers. This is
understandable, as the kernel proper is oopsing less and less...
However, a partial symbol table for a module gives little info
(personally, I export all symbols to the kernel when debugging :)

The code is at the end, uuencoded so you can just pipe it out without
editing. For who's curious, here's the output of the program against
an oops in a "faulty" module (built on purpose). Yes, it's longer, but
there's everything in it, and it's only one screenful with 80x50.

EIP: 0010:0201f030 <faulty_copy+2c/54>
EFLAGS: 00010216
eax: 0000000c
ebx: 00000000
ecx: 00196fb6 <buf+6/400>
edx: 00397018
esi: 00001000
edi: 0800a000
ebp: 00eecf60 <%esp+10>
esp: 00eecf50 <%esp+0>
ds: 0018 es: 0018 fs: 002b gs: 002b ss: 0018
Process cat (pid: 658, process nr: 23, stackpage=00eec000)
esp+0 : 0800a000
esp+4 : 00001000
esp+8 : 00001000
esp+12: 0008ed11
esp+16: 00eecf90 <%esp+40>
esp+20: 0201f083 <faulty_read+2b/88>
esp+24: 0800a000
esp+28: 0201f17c
esp+32: 00001000
esp+36: 0201f135 <faulty_fops+51/98>
esp+40: 0040f1f8
esp+44: 01345140
esp+48: 0800a000
esp+52: 00001000
esp+56: 01345140
esp+60: 0040f1f8
esp+64: 0800a000
esp+68: 00120ec2 <sys_read+aa/bc>
esp+72: 0040f1f8
esp+76: 01345140
esp+80: 0800a000
esp+84: 00001000
esp+88: 00e58018
esp+92: 0800a000
Trace: 0201f083 <faulty_read+2b/88>
Trace: 0201f17c
Trace: 0201f135 <faulty_fops+51/98>
Trace: 00120ec2 <sys_read+aa/bc>
Trace: 0010a459 <system_call+59/a0>
Code: <faulty_copy+2c/54> movl %ebx,%fs:0xfffffffc(%ebp)
Code: <faulty_copy+30/54> movl 0x18c2a4,%eax <jiffies+0/4>
Code: <faulty_copy+35/54> pushl %eax
Code: <faulty_copy+36/54> pushl $0x201f122 <faulty_fops+3e/98>
Code: <faulty_copy+3b/54> call fe0f2fc0 <gcc2_compiled.+fe0f2fc0>


begin 664 oops.c.gz
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`
end


--
__ o La forza dei forti sta nel traversare le traversie con occhio sereno
_`\<, (Paperino)
__( )/( )__ alessandro rubini - rubini@ipvvis.unipv.it


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