diff options
| author | Theo de Raadt <deraadt@cvs.openbsd.org> | 1996-06-16 00:53:46 +0000 |
|---|---|---|
| committer | Theo de Raadt <deraadt@cvs.openbsd.org> | 1996-06-16 00:53:46 +0000 |
| commit | d9786a8a6d48519acdf1233107ea31a88fe6fec8 (patch) | |
| tree | 1a3dc90af4d63f6472c24c61466dd6c7d2f03cb3 /sys/arch | |
| parent | 8db7d350e5e338e525209f599df3332181384514 (diff) | |
netbsd pr#2547, is@beverly.rhein.de; handle bus errors correctly
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/mvme68k/mvme68k/locore.s | 32 |
1 files changed, 26 insertions, 6 deletions
diff --git a/sys/arch/mvme68k/mvme68k/locore.s b/sys/arch/mvme68k/mvme68k/locore.s index 1867f276493..c4eeb0bf28e 100644 --- a/sys/arch/mvme68k/mvme68k/locore.s +++ b/sys/arch/mvme68k/mvme68k/locore.s @@ -1,4 +1,4 @@ -/* $OpenBSD: locore.s,v 1.8 1996/05/29 16:37:17 chuck Exp $ */ +/* $OpenBSD: locore.s,v 1.9 1996/06/16 00:53:45 deraadt Exp $ */ /* * Copyright (c) 1995 Theo de Raadt @@ -657,18 +657,38 @@ Lbe10: cmpw #12,d0 | address error vector? jeq Lisaerr | yes, go to it movl d1,a0 | fault address - ptestr #1,a0@,#7 | do a table search + movl sp@,d0 | function code from ssw + btst #8,d0 | data fault? + jne Lbe10a + movql #1,d0 | user program access FC + | (we dont seperate data/program) + btst #5,a1@ | supervisor mode? + jeq Lbe10a | if no, done + movql #5,d0 | else supervisor program access +Lbe10a: + ptestr d0,a0@,#7 | do a table search pmove psr,sp@ | save result - btst #7,sp@ | bus error bit set? - jeq Lismerr | no, must be MMU fault - clrw sp@ | yes, re-clear pad word - jra Lisberr | and process as normal bus error + movb sp@,d1 + btst #2,d1 | invalid (incl. limit viol. and berr)? + jeq Lmightnotbemerr | no -> wp check + btst #7,d1 | is it MMU table berr? + jeq Lismerr | no, must be fast + jra Lisberr1 | real bus err needs not be fast. +Lmightnotbemerr: + btst #3,d1 | write protect bit set? + jeq Lisberr1 | no: must be bus error + movl sp@,d0 | ssw into low word of d0 + andw #0xc0,d0 | Write protect is set on page: + cmpw #0x40,d0 | was it read cycle? + jeq Lisberr1 | yes, was not WPE, must be bus err Lismerr: movl #T_MMUFLT,sp@- | show that we are an MMU fault jra Ltrapnstkadj | and deal with it Lisaerr: movl #T_ADDRERR,sp@- | mark address error jra Ltrapnstkadj | and deal with it +Lisberr1: + clrw sp@ | re-clear pad word Lisberr: movl #T_BUSERR,sp@- | mark bus error Ltrapnstkadj: |