Ensure the userland thread and floating-point state has been saved before
copying the pcb. These values may have been changed just before the call to fork and without a call to cpu_switch, where they would have been saved. Sponsored by: The FreeBSD Foundation
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parent
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2db317ca85
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=281554
@ -47,6 +47,10 @@ __FBSDID("$FreeBSD$");
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#include <machine/pcb.h>
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#include <machine/frame.h>
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#ifdef VFP
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#include <machine/vfp.h>
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#endif
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/*
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* Finish a fork operation, with process p2 nearly set up.
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* Copy and update the pcb, set up the stack so that the child
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@ -61,6 +65,19 @@ cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
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if ((flags & RFPROC) == 0)
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return;
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if (td1 == curthread) {
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/*
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* Save the tpidr_el0 and the vfp state, these normally happen
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* in cpu_switch, but if userland changes these then forks
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* this may not have happened.
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*/
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td1->td_pcb->pcb_tpidr_el0 = READ_SPECIALREG(tpidr_el0);
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#ifdef VFP
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if ((td1->td_pcb->pcb_fpflags & PCB_FP_STARTED) != 0)
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vfp_save_state(td1);
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#endif
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}
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pcb2 = (struct pcb *)(td2->td_kstack +
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td2->td_kstack_pages * PAGE_SIZE) - 1;
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