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Fix the logic for when to restore the VFP registers. It should restore

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them when a different thread last used them, or when the thread was last
run on a different cpu.

Obtained from:	ABT Systems Ltd
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Andrew Turner 2015-07-01 17:27:44 +00:00
parent 35189d4784
commit c950fb6b67
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=285014
1 changed files with 9 additions and 1 deletions
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10
sys/arm64/arm64/vfp.c
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@ -95,6 +95,9 @@ vfp_save_state(struct thread *td)
*/
cpacr = READ_SPECIALREG(cpacr_el1);
if ((cpacr & CPACR_FPEN_MASK) == CPACR_FPEN_TRAP_NONE) {
KASSERT(PCPU_GET(fpcurthread) == td,
("Storing an invalid VFP state"));
vfp_state = td->td_pcb->pcb_vfp;
__asm __volatile(
"mrs %0, fpcr \n"
@ -142,7 +145,12 @@ vfp_restore_state(void)
vfp_enable();
if (PCPU_GET(fpcurthread) != curthread && cpu != curpcb->pcb_vfpcpu) {
/*
* If the previous thread on this cpu to use the VFP was not the
* current threas, or the current thread last used it on a different
* cpu we need to restore the old state.
*/
if (PCPU_GET(fpcurthread) != curthread || cpu != curpcb->pcb_vfpcpu) {
vfp_state = curthread->td_pcb->pcb_vfp;
fpcr = curthread->td_pcb->pcb_fpcr;