K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2010-12-02T12:44:51.474702Z
K 7
svn:log
V 501
For non-stopped threads, td_frame pointer is undefined.  As a
consequence, fill_regs() and fill_fpregs() access random data, usually
on the thread kernel stack. Most often the td_frame points to the
previous frame saved by last kernel entry sequence, but this is not
guaranteed.

For /proc/<pid>/{regs,fpregs} read access, require the thread to be in
stopped state. Otherwise, return EBUSY as is done for write case.

Reported and tested by:	pho
Approved by:	des (procfs maintainer)
MFC after:	1 week

END