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- Catch up printtrap() to KSE by using curthread and testing it against

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NULL rather than curproc.  Without this, if we trap early before
  curthread is set, we recursively panic.
- In an SMP kernel, if we trap before curthread is set, then trap is going
  to recursively panic trying to bump td->td_md.md_kernnest.  The trap is
  fatal anyways, so to make debugging easier just call printtrap() to
  dump the trap info to the console and then halt.
This commit is contained in:
jhb 2002-01-15 14:17:07 +00:00
parent 2aa7f13a7d
commit 873822cd83
1 changed files with 9 additions and 5 deletions
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14
sys/alpha/alpha/trap.c
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@ -235,12 +235,12 @@ printtrap(a0, a1, a2, entry, framep, isfatal, user)
printf(" pc = 0x%lx\n", framep->tf_regs[FRAME_PC]);
printf(" ra = 0x%lx\n", framep->tf_regs[FRAME_RA]);
printf(" sp = 0x%lx\n", framep->tf_regs[FRAME_SP]);
if (curproc != NULL && (curproc->p_flag & P_KTHREAD) == 0)
if (curthread != NULL && (curthread->td_proc->p_flag & P_KTHREAD) == 0)
printf(" usp = 0x%lx\n", alpha_pal_rdusp());
printf(" curproc = %p\n", curproc);
if (curproc != NULL)
printf(" pid = %d, comm = %s\n", curproc->p_pid,
curproc->p_comm);
printf(" curthread = %p\n", curthread);
if (curthread != NULL)
printf(" pid = %d, comm = %s\n",
curthread->td_proc->p_pid, curthread->td_proc->p_comm);
printf("\n");
}
@ -275,6 +275,10 @@ trap(a0, a1, a2, entry, framep)
pcpup = (struct pcpu *) alpha_pal_rdval();
td = curthread;
#ifdef SMP
if (td == NULL) {
printtrap(a0, a1, a2, entry, framep, 1, 0);
cpu_halt();
}
td->td_md.md_kernnest++;
cpu_critical_exit(s);
#endif