[Xen-devel] dom0cut script patch for x86-64.

[Hiromichi Itou <ito@xxxxxxxx>]

Hi,

In my environment (x86-64), the following problem occurred by  
executing dom0cut script.
# dom0cut_x86.py -oDump2006122801 -dvmcore.2006122801 --target=0 -x/ 
root/xen-3.0.4-testing.hg/xen/xen-syms -ax86_64 -f
Traceback (most recent call last):
  File "/usr/bin/dom0cut_x86.py", line 174, in ?
    main()
  File "/usr/bin/dom0cut_x86.py", line 165, in main
    domextract(outdump, dump, options.xensyms, domid)
  File "/usr/bin/dom0cut_x86.py", line 43, in domextract
    dom_context = xenimg.get_domain_context(domp)
  File "/usr/lib/python2.3/site-packages/xendump/XenImage.py", line  
184, in get_domain_context
    guest_reg.fromXen(regtxt)
  File "/usr/lib/python2.3/site-packages/xendump/Register.py", line  
41, in fromXen
    return self.fromString(self.xenfmt, self.xenregs, regstring)
  File "/usr/lib/python2.3/site-packages/xendump/Register.py", line  
28, in fromString
    regs = struct.unpack(fmt, regstring)
struct.error: unpack str size does not match format

I checked the size of fmt and regstring.  (fmt is  
'QQQQQQQQQQQQQQQLLQHHBBBBQQQQQQQ' in this case.)
struct.calcsize(fmt) was 208. len(regstring) was 200.

The cause of this difference is in the behavior of the struct module  
in 64bit environment.
struct.calcsize('L') is expected to become 4. But,struct.calcsize 
('L') was 8 in my environment.
This difference can be corrected by adding the first character of the  
format string.
An attached patch fix this problem.

Hiromichi Ito

Attachment: dom0cut-0.1.0-x86-64.patch
Description: Binary data

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