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If we get an unhandled page fault in kernel mode, either panic (if

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pcb_onfault is not set) or arrange to restart at the location in
pcb_onfault.

This ought to help the stability of a system under moderate load. It
certainly stops DDB from hanging the kernel when it tries to access a
non-present page.
This commit is contained in:
Doug Rabson 2001-10-24 21:20:50 +00:00
parent e6d808aee3
commit 45740e15b4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=85438
1 changed files with 14 additions and 1 deletions
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15
sys/ia64/ia64/trap.c
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@ -374,12 +374,13 @@ trap(int vector, int imm, struct trapframe *framep)
* address against the address accessed by
* [fs]uswintr, in case another fault happens
* when they are running.
*/
*/
if (!user &&
td != NULL &&
td->td_pcb->pcb_onfault == (unsigned long)fswintrberr &&
td->td_pcb->pcb_accessaddr == va) {
framep->tf_cr_iip = td->td_pcb->pcb_onfault;
framep->tf_cr_ipsr &= ~IA64_PSR_RI;
td->td_pcb->pcb_onfault = 0;
goto out;
}
@ -487,6 +488,18 @@ trap(int vector, int imm, struct trapframe *framep)
if (rv == KERN_SUCCESS)
goto out;
if (!user) {
/* Check for copyin/copyout fault */
if (td != NULL &&
td->td_pcb->pcb_onfault != 0) {
framep->tf_cr_iip =
td->td_pcb->pcb_onfault;
framep->tf_cr_ipsr &= ~IA64_PSR_RI;
td->td_pcb->pcb_onfault = 0;
goto out;
}
goto dopanic;
}
ucode = va;
i = SIGSEGV;
break;