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/* $OpenBSD: trap_subr.s,v 1.2 2003/06/02 23:27:48 millert Exp $ */
/* $NetBSD: trap_subr.s,v 1.2 1997/06/04 22:12:43 is 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
*/
/*
* NOTICE: This is not a standalone file. To use it, #include it in
* your port's locore.s, like so:
*
* #include <m68k/m68k/trap_subr.s>
*/
/*
* Common fault handling code. Called by exception vector handlers.
* Registers have been saved, and type for trap() placed in d0.
*/
ASENTRY_NOPROFILE(fault)
movl usp,a0 | get and save
movl a0,sp@(FR_SP) | the user stack pointer
clrl sp@- | no VA arg
clrl sp@- | or code arg
movl d0,sp@- | push trap type
jbsr _C_LABEL(trap) | handle trap
lea sp@(12),sp | pop value args
movl sp@(FR_SP),a0 | restore
movl a0,usp | user SP
moveml sp@+,#0x7FFF | restore most user regs
addql #8,sp | pop SP and stack adjust
jra _ASM_LABEL(rei) | all done
/*
* Similar to above, but will tidy up the stack, if necessary.
*/
ASENTRY(faultstkadj)
jbsr _C_LABEL(trap) | handle the error
/* for 68060 Branch Prediction Error handler */
_ASM_LABEL(faultstkadjnotrap):
lea sp@(12),sp | pop value args
/* for new 68060 Branch Prediction Error handler */
_ASM_LABEL(faultstkadjnotrap2):
movl sp@(FR_SP),a0 | restore user SP
movl a0,usp | from save area
movw sp@(FR_ADJ),d0 | need to adjust stack?
jne 1f | yes, go to it
moveml sp@+,#0x7FFF | no, restore most user regs
addql #8,sp | toss SSP and stkadj
jra _ASM_LABEL(rei) | all done
1:
lea sp@(FR_HW),a1 | pointer to HW frame
addql #8,a1 | source pointer
movl a1,a0 | source
addw d0,a0 | + hole size = dest pointer
movl a1@-,a0@- | copy
movl a1@-,a0@- | 8 bytes
movl a0,sp@(FR_SP) | new SSP
moveml sp@+,#0x7FFF | restore user registers
movl sp@,sp | and our SP
jra _ASM_LABEL(rei) | all done
/*
* The following exceptions only cause four and six word stack frames
* and require no post-trap stack adjustment.
*/
ENTRY_NOPROFILE(illinst)
clrl sp@-
moveml #0xFFFF,sp@-
moveq #T_ILLINST,d0
jra _ASM_LABEL(fault)
ENTRY_NOPROFILE(zerodiv)
clrl sp@-
moveml #0xFFFF,sp@-
moveq #T_ZERODIV,d0
jra _ASM_LABEL(fault)
ENTRY_NOPROFILE(chkinst)
clrl sp@-
moveml #0xFFFF,sp@-
moveq #T_CHKINST,d0
jra _ASM_LABEL(fault)
ENTRY_NOPROFILE(trapvinst)
clrl sp@-
moveml #0xFFFF,sp@-
moveq #T_TRAPVINST,d0
jra _ASM_LABEL(fault)
ENTRY_NOPROFILE(privinst)
clrl sp@-
moveml #0xFFFF,sp@-
moveq #T_PRIVINST,d0
jra _ASM_LABEL(fault)
/*
* Coprocessor and format errors can generate mid-instruction stack
* frames and cause signal delivery, hence we need to check for potential
* stack adjustment.
*/
ENTRY_NOPROFILE(coperr)
clrl sp@- | stack adjust count
moveml #0xFFFF,sp@-
movl usp,a0 | get and save
movl a0,sp@(FR_SP) | the user stack pointer
clrl sp@- | no VA arg
clrl sp@- | or code arg
movl #T_COPERR,sp@- | push trap type
jra _ASM_LABEL(faultstkadj) | call trap and deal with stack
| adjustments
ENTRY_NOPROFILE(fmterr)
clrl sp@- | stack adjust count
moveml #0xFFFF,sp@-
movl usp,a0 | get and save
movl a0,sp@(FR_SP) | the user stack pointer
clrl sp@- | no VA arg
clrl sp@- | or code arg
movl #T_FMTERR,sp@- | push trap type
jra _ASM_LABEL(faultstkadj) | call trap and deal with stack
| adjustments
|
