Subversion Repositories HelenOS-historic

Rev

Rev 1 | Rev 68 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
2
 * Copyright (C) 2001-2004 Jakub Jermar
3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
29
#include <arch/exception.h>
30
#include <panic.h>
31
#include <arch/cp0.h>
32
#include <arch/types.h>
33
#include <arch.h>
34
 
35
void exception(void)
36
{
37
    int excno;
38
    __u32 epc;
39
    pri_t pri;
40
 
41
    pri = cpu_priority_high();
42
    epc = cp0_epc_read();
43
    cp0_status_write(cp0_status_read() & ~ cp0_status_exl_exception_bit);
44
 
15 jermar 45
    if (THREAD) {
46
        THREAD->saved_pri = pri;
47
        THREAD->saved_epc = epc;
1 jermar 48
    }
49
    /* decode exception number and process the exception */
50
    switch(excno = (cp0_cause_read()>>2)&0x1f) {
51
        case EXC_Int: interrupt(); break;
52
        case EXC_TLBL:
53
        case EXC_TLBS: tlb_invalid(); break;
54
        default: panic(PANIC "unhandled exception %d\n", excno); break;
55
    }
56
 
15 jermar 57
    if (THREAD) {
58
        pri = THREAD->saved_pri;
59
        epc = THREAD->saved_epc;
1 jermar 60
    }
61
 
62
    cp0_epc_write(epc);
63
    cp0_status_write(cp0_status_read() | cp0_status_exl_exception_bit);
64
    cpu_priority_restore(pri);
65
}