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/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* $Id: exception.s,v 1.3 1994/04/02 07:00:23 davidg Exp $
*/
#include "npx.h" /* NNPX */
#include "assym.s" /* system defines */
#include <sys/errno.h> /* error return codes */
#include <machine/spl.h> /* SWI_AST_MASK ... */
#include <machine/psl.h> /* PSL_I */
#include <machine/trap.h> /* trap codes */
#include <sys/syscall.h> /* syscall numbers */
#include <machine/asmacros.h> /* miscellaneous macros */
#define KDSEL 0x10 /* kernel data selector */
#define SEL_RPL_MASK 0x0003
#define TRAPF_CS_OFF (13 * 4)
.text
/*****************************************************************************/
/* Trap handling */
/*****************************************************************************/
/*
* Trap and fault vector routines
*/
#define IDTVEC(name) ALIGN_TEXT ; .globl _X/**/name ; _X/**/name:
#define TRAP(a) pushl $(a) ; jmp _alltraps
/*
* XXX - debugger traps are now interrupt gates so at least bdb doesn't lose
* control. The sti's give the standard losing behaviour for ddb and kgdb.
*/
#ifdef BDE_DEBUGGER
#define BDBTRAP(name) \
ss ; \
cmpb $0,_bdb_exists ; \
je 1f ; \
testb $SEL_RPL_MASK,4(%esp) ; \
jne 1f ; \
ss ; \
.globl bdb_/**/name/**/_ljmp ; \
bdb_/**/name/**/_ljmp: ; \
ljmp $0,$0 ; \
1:
#else
#define BDBTRAP(name)
#endif
#ifdef KGDB
# define BPTTRAP(a) testl $PSL_I,4+8(%esp) ; je 1f ; sti ; 1: ; \
pushl $(a) ; jmp _bpttraps
#else
# define BPTTRAP(a) testl $PSL_I,4+8(%esp) ; je 1f ; sti ; 1: ; TRAP(a)
#endif
MCOUNT_LABEL(user)
MCOUNT_LABEL(btrap)
IDTVEC(div)
pushl $0; TRAP(T_DIVIDE)
IDTVEC(dbg)
BDBTRAP(dbg)
pushl $0; BPTTRAP(T_TRCTRAP)
IDTVEC(nmi)
pushl $0; TRAP(T_NMI)
IDTVEC(bpt)
BDBTRAP(bpt)
pushl $0; BPTTRAP(T_BPTFLT)
IDTVEC(ofl)
pushl $0; TRAP(T_OFLOW)
IDTVEC(bnd)
pushl $0; TRAP(T_BOUND)
IDTVEC(ill)
pushl $0; TRAP(T_PRIVINFLT)
IDTVEC(dna)
pushl $0; TRAP(T_DNA)
IDTVEC(dble)
TRAP(T_DOUBLEFLT)
IDTVEC(fpusegm)
pushl $0; TRAP(T_FPOPFLT)
IDTVEC(tss)
TRAP(T_TSSFLT)
IDTVEC(missing)
TRAP(T_SEGNPFLT)
IDTVEC(stk)
TRAP(T_STKFLT)
IDTVEC(prot)
TRAP(T_PROTFLT)
IDTVEC(page)
TRAP(T_PAGEFLT)
IDTVEC(rsvd)
pushl $0; TRAP(T_RESERVED)
IDTVEC(fpu)
#if NNPX > 0
/*
* Handle like an interrupt so that we can call npxintr to clear the
* error. It would be better to handle npx interrupts as traps but
* this is difficult for nested interrupts.
*/
pushl $0 /* dumby error code */
pushl $0 /* dumby trap type */
pushal
pushl %ds
pushl %es /* now the stack frame is a trap frame */
movl $KDSEL,%eax
movl %ax,%ds
movl %ax,%es
FAKE_MCOUNT(12*4(%esp))
movl _cpl,%eax
pushl %eax
pushl $0 /* dummy unit to finish building intr frame */
incl _cnt+V_TRAP
orl $SWI_AST_MASK,%eax
movl %eax,_cpl
call _npxintr
MEXITCOUNT
jmp _doreti
#else /* NNPX > 0 */
pushl $0; TRAP(T_ARITHTRAP)
#endif /* NNPX > 0 */
/* 17 - 31 reserved for future exp */
IDTVEC(rsvd0)
pushl $0; TRAP(17)
IDTVEC(rsvd1)
pushl $0; TRAP(18)
IDTVEC(rsvd2)
pushl $0; TRAP(19)
IDTVEC(rsvd3)
pushl $0; TRAP(20)
IDTVEC(rsvd4)
pushl $0; TRAP(21)
IDTVEC(rsvd5)
pushl $0; TRAP(22)
IDTVEC(rsvd6)
pushl $0; TRAP(23)
IDTVEC(rsvd7)
pushl $0; TRAP(24)
IDTVEC(rsvd8)
pushl $0; TRAP(25)
IDTVEC(rsvd9)
pushl $0; TRAP(26)
IDTVEC(rsvd10)
pushl $0; TRAP(27)
IDTVEC(rsvd11)
pushl $0; TRAP(28)
IDTVEC(rsvd12)
pushl $0; TRAP(29)
IDTVEC(rsvd13)
pushl $0; TRAP(30)
IDTVEC(rsvd14)
pushl $0; TRAP(31)
SUPERALIGN_TEXT
_alltraps:
pushal
pushl %ds
pushl %es
movl $KDSEL,%eax
movl %ax,%ds
movl %ax,%es
FAKE_MCOUNT(12*4(%esp))
calltrap:
FAKE_MCOUNT(_btrap) /* init "from" _btrap -> calltrap */
incl _cnt+V_TRAP
orl $SWI_AST_MASK,_cpl
call _trap
/*
* There was no place to save the cpl so we have to recover it
* indirectly. For traps from user mode it was 0, and for traps
* from kernel mode Oring SWI_AST_MASK into it didn't change it.
*/
subl %eax,%eax
testb $SEL_RPL_MASK,TRAPF_CS_OFF(%esp)
jne 1f
movl _cpl,%eax
1:
/*
* Return via _doreti to handle ASTs. Have to change trap frame
* to interrupt frame.
*/
pushl %eax
subl $4,%esp
MEXITCOUNT
jmp _doreti
#ifdef KGDB
/*
* This code checks for a kgdb trap, then falls through
* to the regular trap code.
*/
SUPERALIGN_TEXT
_bpttraps:
pushal
pushl %ds
pushl %es
movl $KDSEL,%eax
movl %ax,%ds
movl %ax,%es
FAKE_MCOUNT(12*4(%esp))
testb $SEL_RPL_MASK,TRAPF_CS_OFF(%esp) /* non-kernel mode? */
jne calltrap /* yes */
call _kgdb_trap_glue
MEXITCOUNT
jmp calltrap
#endif
/*
* Call gate entry for syscall
*/
SUPERALIGN_TEXT
IDTVEC(syscall)
pushfl /* Room for tf_err */
pushfl /* Room for tf_trapno */
pushal
pushl %ds
pushl %es
movl $KDSEL,%eax /* switch to kernel segments */
movl %ax,%ds
movl %ax,%es
movl TF_ERR(%esp),%eax /* copy eflags from tf_err to fs_eflags */
movl %eax,TF_EFLAGS(%esp)
FAKE_MCOUNT(12*4(%esp))
incl _cnt+V_SYSCALL
movl $SWI_AST_MASK,_cpl
call _syscall
/*
* Return via _doreti to handle ASTs.
*/
pushl $0 /* cpl to restore */
subl $4,%esp
MEXITCOUNT
jmp _doreti
/*
* include generated interrupt vectors and ISA intr code
*/
#include "i386/isa/vector.s"
#include "i386/isa/icu.s"
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