Subversion Repositories HelenOS

Rev

Rev 4137 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2003-2004 Jakub Jermar
1 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
 
1754 jermar 29
/** @addtogroup mips32 
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
1 jermar 35
#include <arch/exception.h>
195 vana 36
#include <arch/interrupt.h>
2089 decky 37
#include <arch/mm/tlb.h>
1 jermar 38
#include <panic.h>
39
#include <arch/cp0.h>
40
#include <arch/types.h>
41
#include <arch.h>
227 jermar 42
#include <debug.h>
391 jermar 43
#include <proc/thread.h>
590 palkovsky 44
#include <print.h>
45
#include <interrupt.h>
609 palkovsky 46
#include <func.h>
1936 decky 47
#include <ddi/irq.h>
614 palkovsky 48
#include <arch/debugger.h>
4132 svoboda 49
#include <symtab.h>
50
 
590 palkovsky 51
static char * exctable[] = {
1769 jermar 52
    "Interrupt",
53
    "TLB Modified",
54
    "TLB Invalid",
55
    "TLB Invalid Store",
56
    "Address Error - load/instr. fetch",
57
    "Address Error - store",
58
    "Bus Error - fetch instruction",
59
    "Bus Error - data reference",
60
    "Syscall",
61
    "BreakPoint",
62
    "Reserved Instruction",
63
    "Coprocessor Unusable",
64
    "Arithmetic Overflow",
65
    "Trap",
66
    "Virtual Coherency - instruction",
67
    "Floating Point",
68
    NULL, NULL, NULL, NULL, NULL, NULL, NULL,
69
    "WatchHi/WatchLo", /* 23 */
70
    NULL, NULL, NULL, NULL, NULL, NULL, NULL,
71
    "Virtual Coherency - data",
590 palkovsky 72
};
73
 
958 jermar 74
static void print_regdump(istate_t *istate)
590 palkovsky 75
{
4137 svoboda 76
    char *pcsymbol, *rasymbol;
590 palkovsky 77
 
4137 svoboda 78
    pcsymbol = symtab_fmt_name_lookup(istate->epc);
79
    rasymbol = symtab_fmt_name_lookup(istate->ra);
80
 
81
    printf("PC: %#x(%s) RA: %#x(%s), SP(%p)\n", istate->epc, pcsymbol,
82
        istate->ra, rasymbol, istate->sp);
590 palkovsky 83
}
84
 
958 jermar 85
static void unhandled_exception(int n, istate_t *istate)
590 palkovsky 86
{
3790 svoboda 87
    fault_if_from_uspace(istate, "Unhandled exception %s.", exctable[n]);
1595 palkovsky 88
 
958 jermar 89
    print_regdump(istate);
3790 svoboda 90
    panic("Unhandled exception %s.", exctable[n]);
590 palkovsky 91
}
92
 
1119 palkovsky 93
static void reserved_instr_exception(int n, istate_t *istate)
94
{
1780 jermar 95
    if (*((uint32_t *)istate->epc) == 0x7c03e83b) {
1119 palkovsky 96
        ASSERT(THREAD);
97
        istate->epc += 4;
98
        istate->v1 = istate->k1;
1126 palkovsky 99
    } else
100
        unhandled_exception(n, istate);
1119 palkovsky 101
}
102
 
958 jermar 103
static void breakpoint_exception(int n, istate_t *istate)
590 palkovsky 104
{
614 palkovsky 105
#ifdef CONFIG_DEBUG
958 jermar 106
    debugger_bpoint(istate);
614 palkovsky 107
#else
590 palkovsky 108
    /* it is necessary to not re-execute BREAK instruction after
109
       returning from Exception handler
110
       (see page 138 in R4000 Manual for more information) */
958 jermar 111
    istate->epc += 4;
614 palkovsky 112
#endif
590 palkovsky 113
}
114
 
958 jermar 115
static void tlbmod_exception(int n, istate_t *istate)
590 palkovsky 116
{
958 jermar 117
    tlb_modified(istate);
590 palkovsky 118
}
119
 
958 jermar 120
static void tlbinv_exception(int n, istate_t *istate)
590 palkovsky 121
{
958 jermar 122
    tlb_invalid(istate);
590 palkovsky 123
}
124
 
615 palkovsky 125
#ifdef CONFIG_FPU_LAZY
958 jermar 126
static void cpuns_exception(int n, istate_t *istate)
590 palkovsky 127
{
128
    if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
129
        scheduler_fpu_lazy_request();
1595 palkovsky 130
    else {
3790 svoboda 131
        fault_if_from_uspace(istate, "Unhandled Coprocessor Unusable Exception.");
132
        panic("Unhandled Coprocessor Unusable Exception.");
1595 palkovsky 133
    }
590 palkovsky 134
}
615 palkovsky 135
#endif
590 palkovsky 136
 
958 jermar 137
static void interrupt_exception(int n, istate_t *istate)
590 palkovsky 138
{
1780 jermar 139
    uint32_t cause;
590 palkovsky 140
    int i;
141
 
142
    /* decode interrupt number and process the interrupt */
3906 jermar 143
    cause = (cp0_cause_read() >> 8) & 0xff;
590 palkovsky 144
 
1936 decky 145
    for (i = 0; i < 8; i++) {
146
        if (cause & (1 << i)) {
147
            irq_t *irq = irq_dispatch_and_lock(i);
148
            if (irq) {
149
                /*
150
                 * The IRQ handler was found.
151
                 */
3906 jermar 152
                irq->handler(irq);
1936 decky 153
                spinlock_unlock(&irq->lock);
154
            } else {
155
                /*
156
                 * Spurious interrupt.
157
                 */
158
#ifdef CONFIG_DEBUG
3906 jermar 159
                printf("cpu%u: spurious interrupt (inum=%d)\n",
160
                    CPU->id, i);
1936 decky 161
#endif
162
            }
163
        }
164
    }
590 palkovsky 165
}
166
 
1096 palkovsky 167
/** Handle syscall userspace call */
168
static void syscall_exception(int n, istate_t *istate)
1 jermar 169
{
3790 svoboda 170
    panic("Syscall is handled through shortcut.");
1 jermar 171
}
590 palkovsky 172
 
173
void exception_init(void)
174
{
175
    int i;
176
 
177
    /* Clear exception table */
1936 decky 178
    for (i = 0; i < IVT_ITEMS; i++)
799 palkovsky 179
        exc_register(i, "undef", (iroutine) unhandled_exception);
1936 decky 180
 
799 palkovsky 181
    exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);
1119 palkovsky 182
    exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);
799 palkovsky 183
    exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);
184
    exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);
185
    exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);
186
    exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);
590 palkovsky 187
#ifdef CONFIG_FPU_LAZY
799 palkovsky 188
    exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);
590 palkovsky 189
#endif
799 palkovsky 190
    exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);
590 palkovsky 191
}
1702 cejka 192
 
1754 jermar 193
/** @}
1702 cejka 194
 */