Scott Wood 9d378dfac8 powerpc/booke64: Use SPRG7 for VDSO ... Previously SPRG3 was marked for use by both VDSO and critical interrupts (though critical interrupts were not fully implemented). In commit 8b64a9dfb0 ("powerpc/booke64: Use SPRG0/3 scratch for bolted TLB miss & crit int"), Mihai Caraman made an attempt to resolve this conflict by restoring the VDSO value early in the critical interrupt, but this has some issues: - It's incompatible with EXCEPTION_COMMON which restores r13 from the by-then-overwritten scratch (this cost me some debugging time). - It forces critical exceptions to be a special case handled differently from even machine check and debug level exceptions. - It didn't occur to me that it was possible to make this work at all (by doing a final "ld r13, PACA_EXCRIT+EX_R13(r13)") until after I made (most of) this patch. :-) It might be worth investigating using a load rather than SPRG on return from all exceptions (except TLB misses where the scratch never leaves the SPRG) -- it could save a few cycles. Until then, let's stick with SPRG for all exceptions. Since we cannot use SPRG4-7 for scratch without corrupting the state of a KVM guest, move VDSO to SPRG7 on book3e. Since neither SPRG4-7 nor critical interrupts exist on book3s, SPRG3 is still used for VDSO there. Signed-off-by: Scott Wood <scottwood@freescale.com> Cc: Mihai Caraman <mihai.caraman@freescale.com> Cc: Anton Blanchard <anton@samba.org> Cc: Paul Mackerras <paulus@samba.org> Cc: kvm-ppc@vger.kernel.org		2014-03-19 19:57:14 -05:00
..
.gitignore
cacheflush.S	[POWERPC] vdso: Fixes for cache block sizes	2007-11-20 13:56:31 +11:00
datapage.S
getcpu.S	powerpc/booke64: Use SPRG7 for VDSO	2014-03-19 19:57:14 -05:00
gettimeofday.S	powerpc/8xx: mfspr SPRN_TBRx in lieu of mftb/mftbu is not supported	2013-11-22 16:56:48 -06:00
Makefile	powerpc: Add VDSO version of getcpu	2012-07-11 14:18:40 +10:00
note.S
sigtramp.S	Fix common misspellings	2011-03-31 11:26:23 -03:00
vdso32_wrapper.S	powerpc: Use unstripped VDSO image for more accurate profiling data	2014-02-17 11:19:37 +11:00
vdso32.lds.S	powerpc: Add ability to build little endian kernels	2013-10-11 16:48:56 +11:00