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In kcopy(), make sure we save and restore the old fault handler; kcopy() 

is called from uiomove(), which may be in the code path of servicing
a non-fatal page fault caused by a copyin() or copyout().

Originally suggested by Steve Woodford.
This commit is contained in:
thorpej 1998-03-04 06:39:14 +00:00
parent d4e79b6ace
commit f766e521be
1 changed files with 12 additions and 6 deletions
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16
sys/arch/m68k/m68k/copy.s
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@ -1,4 +1,4 @@
/* $NetBSD: copy.s,v 1.29 1998/02/15 21:18:45 thorpej Exp $ */
/* $NetBSD: copy.s,v 1.30 1998/03/04 06:39:14 thorpej Exp $ */
/*-
* Copyright (c) 1998 Jason R. Thorpe. All rights reserved.
@ -318,11 +318,17 @@ Lcosfault:
/*
* kcopy(const void *src, void *dst, size_t len);
*
* Copy len bytes from src to dst, aborting if we encounter a page fault.
* Copy len bytes from src to dst, aborting if we encounter a fatal
* page fault.
*
* kcopy() _must_ save and restore the old fault handler since it is
* called by uiomove(), which may be in the path of servicing a non-fatal
* page fault.
*/
ENTRY(kcopy)
link a6,#0
link a6,#-4
movl _C_LABEL(curpcb),a0 | set fault handler
movl a0@(PCB_ONFAULT),a6@(-4) | save old handler first
movl #Lkcfault,a0@(PCB_ONFAULT)
movl a6@(16),sp@- | push len
movl a6@(12),sp@- | push dst
@ -331,8 +337,8 @@ ENTRY(kcopy)
addl #12,sp | pop args
clrl d0 | success!
Lkcdone:
movl _C_LABEL(curpcb),a0 | clear fault handler
clrl a0@(PCB_ONFAULT)
movl _C_LABEL(curpcb),a0 | restore fault handler
movl a6@(-4),a0@(PCB_ONFAULT)
unlk a6
rts
Lkcfault: