Author: nwhitehorn
Date: Sat Oct 31 20:59:13 2009
New Revision: 198731
URL: http://svn.freebsd.org/changeset/base/198731
Log:
Unbreak cpu_switch(). The register allocator in my brain is clearly
broken. Also, Altivec context switching worked before only by accident,
but should work now by design.
Modified:
head/sys/powerpc/aim/swtch.S
Modified: head/sys/powerpc/aim/swtch.S
==============================================================================
--- head/sys/powerpc/aim/swtch.S Sat Oct 31 19:22:12 2009
(r198730)
+++ head/sys/powerpc/aim/swtch.S Sat Oct 31 20:59:13 2009
(r198731)
@@ -99,17 +99,19 @@ ENTRY(cpu_switch)
mr %r14,%r3 /* Copy the old thread ptr... */
mr %r15,%r4 /* and the new thread ptr in scratch */
mr %r16,%r5 /* and the new lock */
+ mr %r17,%r6 /* and the PCB */
- lwz %r6,PCB_FLAGS(%r5)
+ lwz %r7,PCB_FLAGS(%r17)
/* Save FPU context if needed */
- andi. %r6, %r6, PCB_FPU
+ andi. %r7, %r7, PCB_FPU
beq .L1
bl save_fpu
.L1:
- lwz %r6,PCB_FLAGS(%r5)
+ mr %r3,%r14 /* restore old thread ptr */
+ lwz %r7,PCB_FLAGS(%r17)
/* Save Altivec context if needed */
- andi. %r6, %r6, PCB_VEC
+ andi. %r7, %r7, PCB_VEC
beq .L2
bl save_vec
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