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arm64: Clear FPU flags in the pcb in cpu_copy_thread().

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New threads start off with clean FPU state instead of inheriting state
from the parent thread.

PR:		247945
Sponsored by:	Netflix
This commit is contained in:
John Baldwin 2021-01-08 14:56:54 -08:00
parent c7f3aa34cf
commit c6e27f5697
1 changed files with 1 additions and 0 deletions
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sys/arm64/arm64/vm_machdep.c
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@ -175,6 +175,7 @@ cpu_copy_thread(struct thread *td, struct thread *td0)
td->td_pcb->pcb_x[9] = (uintptr_t)td;
td->td_pcb->pcb_lr = (uintptr_t)fork_trampoline;
td->td_pcb->pcb_sp = (uintptr_t)td->td_frame;
td->td_pcb->pcb_fpflags &= ~(PCB_FP_STARTED | PCB_FP_KERN | PCB_FP_NOSAVE);
td->td_pcb->pcb_fpusaved = &td->td_pcb->pcb_fpustate;
td->td_pcb->pcb_vfpcpu = UINT_MAX;