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Improve on cpu_set_upcall:

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o  Use pcb and tf for the new pcb and the new trapframe and use pcb0
   for the old (current) pcb. The mix of pcb, pcb2 and tf was slightly
   confusing.
o  Don't define td->td_frame here. It has already been set previously
   by cpu_thread_setup. Add a KASSERT to make sure pcb and tf are both
   non-NULL.
o  Make sure the number of dirty registers is 0 for the new thread.
   There are no user registers on the backing store because we heven't
   enter userland yet.
This commit is contained in:
Marcel Moolenaar 2003-06-01 23:19:21 +00:00
parent 234dfc904a
commit 86f4f6f7b8
1 changed files with 13 additions and 13 deletions
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26
sys/ia64/ia64/vm_machdep.c
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@ -120,29 +120,29 @@ cpu_thread_setup(struct thread *td)
}
void
cpu_set_upcall(struct thread *td, void *pcb)
cpu_set_upcall(struct thread *td, void *pcb0)
{
struct pcb *pcb2;
struct pcb *pcb;
struct trapframe *tf;
pcb2 = td->td_pcb;
bcopy(pcb, pcb2, sizeof(*pcb2));
pcb = td->td_pcb;
KASSERT(pcb != NULL, ("foo"));
bcopy(pcb0, pcb, sizeof(*pcb));
tf = (struct trapframe *)pcb2 - 1;
td->td_frame = tf;
tf->tf_length = sizeof(struct trapframe);
tf = td->td_frame;
KASSERT(tf != NULL, ("foo"));
tf->tf_flags = FRAME_SYSCALL;
tf->tf_special.ndirty = 0;
tf->tf_scratch.gr8 = 0;
tf->tf_scratch.gr9 = 1;
tf->tf_scratch.gr10 = 0;
/* XXX */
pcb2->pcb_special.bspstore = td->td_kstack + tf->tf_special.ndirty;
pcb2->pcb_special.pfs = 0;
pcb2->pcb_current_pmap = vmspace_pmap(td->td_proc->p_vmspace);
pcb2->pcb_special.sp = (uintptr_t)tf - 16;
pcb2->pcb_special.rp = FDESC_FUNC(fork_trampoline);
pcb->pcb_special.bspstore = td->td_kstack;
pcb->pcb_special.pfs = 0;
pcb->pcb_current_pmap = vmspace_pmap(td->td_proc->p_vmspace);
pcb->pcb_special.sp = (uintptr_t)tf - 16;
pcb->pcb_special.rp = FDESC_FUNC(fork_trampoline);
cpu_set_fork_handler(td, (void (*)(void*))fork_return, td);
}