/* $NetBSD: buserr_10.s,v 1.2 2026/04/13 19:36:37 thorpej Exp $ */ /* * Copyright (c) 1988 University of Utah. * Copyright (c) 1980, 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: Utah $Hdr: locore.s 1.66 92/12/22$ * * @(#)locore.s 8.6 (Berkeley) 5/27/94 */ /* * bus error and address error handler routines for 68010 (with various * MMU types). */ #include "opt_m68k_arch.h" #include <machine/asm.h> #include <machine/trap.h> #include "assym.h" .file "buserr_10.s" .text #if !defined(M68K_MMU_SUN2) #error Why are we even here? #endif #define MULTIMMU ((defined(M68K_MMU_SUN2)) \ > 1) ENTRY_NOPROFILE(busaddrerr10) GLOBAL(buserr10) GLOBAL(addrerr10) | 68010 always pushes a Format 8 frame for these exceptions. clrl %sp@- | stack adjust count + pad word moveml %d0-%d7/%a0-%a7,%sp@- | save user registers movl %usp,%a0 | save the user SP movl %a0,%sp@(FR_SP) | in the savearea moveq #0,%d0 movw %sp@(FR_FMT8_SSW),%d0 | grab SSW for fault processing movl %sp@(FR_FMT8_ACCADDR),%d1 | fault address is as given in frame movl %d1,%sp@- | push fault VA movl %d0,%sp@- | and padded SSW movw %sp@(8+FR_FORVEC),%d0 | get frame format/vector offset andw #0x0FFF,%d0 | clear out frame format cmpw #12,%d0 | address error vector? jeq Lisaerr | yes, go to it #if defined(M68K_MMU_SUN2) /* * Sun2 MMU handling. */ #if MULTIMMU #error No MULTIMMU configuration for Sun2. #endif Lbuserr10_sun2_mmu: clrl %d0 | make sure top bits are cleared too movl %d1,%sp@- | save %d1 movc %sfc,%d1 | save %sfc to %d1 moveq #FC_CONTROL,%d0 | %sfc = FC_CONTROL movc %d0,%sfc movsw BUSERR_REG,%d0 | get value of bus error register movc %d1,%sfc | restore %sfc movl %sp@+,%d1 | restore %d1 #ifdef DEBUG movw %d0,_C_LABEL(buserr_reg) | save bus error register value #endif andb #BUSERR_PROTERR,%d0 | is this an MMU | (protection *or* page unavailable) | fault? jeq _ASM_LABEL(buserr_common) | non-MMU bus error #if MULTIMMU jra Lismerr | MMU fault #endif #endif /* M68K_MMU_SUN2 */ Lismerr: movl #T_MMUFLT,%sp@- | show that we are an MMU fault jra _ASM_LABEL(faultstkadj) | and deal with it Lisaerr: movl #T_ADDRERR,%sp@- | mark address error jra _ASM_LABEL(faultstkadj) | and deal with it
