Subversion Repositories HelenOS-historic

Rev

Rev 1196 | Rev 1595 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
319 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
 
29
#include <arch/exception.h>
195 vana 30
#include <arch/interrupt.h>
1 jermar 31
#include <panic.h>
32
#include <arch/cp0.h>
33
#include <arch/types.h>
34
#include <arch.h>
227 jermar 35
#include <debug.h>
391 jermar 36
#include <proc/thread.h>
590 palkovsky 37
#include <symtab.h>
38
#include <print.h>
39
#include <interrupt.h>
609 palkovsky 40
#include <func.h>
41
#include <console/kconsole.h>
614 palkovsky 42
#include <arch/debugger.h>
1 jermar 43
 
590 palkovsky 44
static char * exctable[] = {
45
    "Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store",
46
        "Address Error - load/instr. fetch",
47
        "Address Error - store",
48
        "Bus Error - fetch instruction",
49
        "Bus Error - data reference",
50
        "Syscall",
51
        "BreakPoint",
52
        "Reserved Instruction",
53
        "Coprocessor Unusable",
54
        "Arithmetic Overflow",
55
        "Trap",
56
        "Virtual Coherency - instruction",
57
        "Floating Point",
58
        NULL, NULL, NULL, NULL, NULL, NULL, NULL,
59
        "WatchHi/WatchLo", /* 23 */
60
        NULL, NULL, NULL, NULL, NULL, NULL, NULL,
61
        "Virtual Coherency - data",
62
};
63
 
958 jermar 64
static void print_regdump(istate_t *istate)
590 palkovsky 65
{
66
    char *pcsymbol = "";
67
    char *rasymbol = "";
68
 
958 jermar 69
    char *s = get_symtab_entry(istate->epc);
590 palkovsky 70
    if (s)
71
        pcsymbol = s;
958 jermar 72
    s = get_symtab_entry(istate->ra);
590 palkovsky 73
    if (s)
74
        rasymbol = s;
75
 
1221 decky 76
    printf("PC: %#x(%s) RA: %#x(%s), SP(%p)\n", istate->epc, pcsymbol, istate->ra, rasymbol, istate->sp);
590 palkovsky 77
}
78
 
958 jermar 79
static void unhandled_exception(int n, istate_t *istate)
590 palkovsky 80
{
958 jermar 81
    print_regdump(istate);
590 palkovsky 82
    panic("unhandled exception %s\n", exctable[n]);
83
}
84
 
1119 palkovsky 85
static void reserved_instr_exception(int n, istate_t *istate)
86
{
87
    if (*((__u32 *)istate->epc) == 0x7c03e83b) {
88
        ASSERT(THREAD);
89
        istate->epc += 4;
90
        istate->v1 = istate->k1;
1126 palkovsky 91
    } else
92
        unhandled_exception(n, istate);
1119 palkovsky 93
}
94
 
958 jermar 95
static void breakpoint_exception(int n, istate_t *istate)
590 palkovsky 96
{
614 palkovsky 97
#ifdef CONFIG_DEBUG
958 jermar 98
    debugger_bpoint(istate);
614 palkovsky 99
#else
590 palkovsky 100
    /* it is necessary to not re-execute BREAK instruction after
101
       returning from Exception handler
102
       (see page 138 in R4000 Manual for more information) */
958 jermar 103
    istate->epc += 4;
614 palkovsky 104
#endif
590 palkovsky 105
}
106
 
958 jermar 107
static void tlbmod_exception(int n, istate_t *istate)
590 palkovsky 108
{
958 jermar 109
    tlb_modified(istate);
590 palkovsky 110
}
111
 
958 jermar 112
static void tlbinv_exception(int n, istate_t *istate)
590 palkovsky 113
{
958 jermar 114
    tlb_invalid(istate);
590 palkovsky 115
}
116
 
615 palkovsky 117
#ifdef CONFIG_FPU_LAZY
958 jermar 118
static void cpuns_exception(int n, istate_t *istate)
590 palkovsky 119
{
120
    if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
121
        scheduler_fpu_lazy_request();
122
    else
123
        panic("unhandled Coprocessor Unusable Exception\n");
124
}
615 palkovsky 125
#endif
590 palkovsky 126
 
958 jermar 127
static void interrupt_exception(int n, istate_t *istate)
590 palkovsky 128
{
129
    __u32 cause;
130
    int i;
131
 
132
    /* decode interrupt number and process the interrupt */
133
    cause = (cp0_cause_read() >> 8) &0xff;
134
 
135
    for (i = 0; i < 8; i++)
136
        if (cause & (1 << i))
958 jermar 137
            exc_dispatch(i+INT_OFFSET, istate);
590 palkovsky 138
}
139
 
1096 palkovsky 140
/** Handle syscall userspace call */
141
static void syscall_exception(int n, istate_t *istate)
1 jermar 142
{
1096 palkovsky 143
    panic("Syscall is handled through shortcut");
1 jermar 144
}
590 palkovsky 145
 
146
void exception_init(void)
147
{
148
    int i;
149
 
150
    /* Clear exception table */
151
    for (i=0;i < IVT_ITEMS; i++)
799 palkovsky 152
        exc_register(i, "undef", (iroutine) unhandled_exception);
153
    exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);
1119 palkovsky 154
    exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);
799 palkovsky 155
    exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);
156
    exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);
157
    exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);
158
    exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);
590 palkovsky 159
#ifdef CONFIG_FPU_LAZY
799 palkovsky 160
    exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);
590 palkovsky 161
#endif
799 palkovsky 162
    exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);
590 palkovsky 163
}