[Bug target/54760] [SH] Add __builtin_thread_pointer, __builtin_set_thread_pointer

[olegendo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54760

--- Comment #7 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-10-12 00:26:42 UTC ---
(In reply to comment #6)
> (In reply to comment #5)
> > Kaz, do you happen to know something regarding this matter?
> 
> My SH4 software manual says for STC that all stc/stc.l instructions
> except stc gbr,rn/stc gbr,@-rn are privileged instructions which
> might cause an illegal exception in user mode.  LDC has a similar
> remark.

Yes, but e.g. in the manual rej09b0003_sh4a.pdf, pdf page 346 (STC insn), in
addition to the gbr user/privileged mode note:

Possible Exceptions:
* Data TLB multiple-hit exception
* General illegal instruction exception
* Slot illegal instruction exception      <<< but which insns?!?!
* Data TLB miss exception
* Data TLB protection violation exception
* Initial page write exception
* Data address error

I'd like to leave this open until this has been clarified/confirmed.