[RFA] Sparc libjava support update

[Andrew Haley]

David S. Miller writes:
 >    From: Andrew Haley <aph@redhat.com>
 >    Date: Sun, 21 Apr 2002 11:34:10 +0100 (BST)
 > 
 >    In fact, can you plese provide an explanatory comment for all this
 >    weirdness:
 >    
 > I'm finding the signal frame saved regs, and then using
 > that to advance the Sparc program counter "in the standard way
 > for Sparc" which is "pc = next_pc; next_pc += 4;".
 > 
 > What's not to understand?
 > 
 > I'll add the comments, but I cringe when comments speak out what the C
 > code does line by line ala:
 > 
 > 	/* Add one to c */
 > 	c++;

No, that's not what I'm asking for.  The thing that needs commenting is

  if (insn == 0x821020d8)						\
    regp = (struct sig_regs *) _sip;					\
  else									\
    regp = (struct sig_regs *) (_sip + 1);				\

What is the magic insn?  Why does it cause regp to be off by one?

 > As all it does is take up valuable screen real-estate :-(
 > 
 > And the comments here shouldn't be a lesson in Sparc or Linux signal
 > internals either, I think.

Andrew.