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1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2003-2004 Jakub Jermar
1 jermar 3
 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup mips32 
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 * @{
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 */
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/** @file
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 */
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1 jermar 35
#include <arch/exception.h>
195 vana 36
#include <arch/interrupt.h>
2089 decky 37
#include <arch/mm/tlb.h>
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#include <panic.h>
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#include <arch/cp0.h>
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#include <arch/types.h>
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#include <arch.h>
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#include <debug.h>
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#include <proc/thread.h>
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#include <print.h>
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#include <interrupt.h>
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#include <func.h>
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#include <ddi/irq.h>
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#include <arch/debugger.h>
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#include <udebug/udebug.h>
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#include <symtab.h>
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590 palkovsky 52
static char * exctable[] = {
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    "Interrupt",
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    "TLB Modified",
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    "TLB Invalid",
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    "TLB Invalid Store",
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    "Address Error - load/instr. fetch",
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    "Address Error - store",
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    "Bus Error - fetch instruction",
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    "Bus Error - data reference",
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    "Syscall",
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    "BreakPoint",
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    "Reserved Instruction",
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    "Coprocessor Unusable",
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    "Arithmetic Overflow",
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    "Trap",
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    "Virtual Coherency - instruction",
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    "Floating Point",
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    NULL, NULL, NULL, NULL, NULL, NULL, NULL,
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    "WatchHi/WatchLo", /* 23 */
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    NULL, NULL, NULL, NULL, NULL, NULL, NULL,
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    "Virtual Coherency - data",
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};
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958 jermar 75
static void print_regdump(istate_t *istate)
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{
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    char *pcsymbol, *rasymbol;
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4377 svoboda 79
    pcsymbol = symtab_fmt_name_lookup(istate->epc);
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    rasymbol = symtab_fmt_name_lookup(istate->ra);
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    printf("PC: %#x(%s) RA: %#x(%s), SP(%p)\n", istate->epc, pcsymbol,
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        istate->ra, rasymbol, istate->sp);
590 palkovsky 84
}
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958 jermar 86
static void unhandled_exception(int n, istate_t *istate)
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{
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    fault_if_from_uspace(istate, "Unhandled exception %s.", exctable[n]);
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958 jermar 90
    print_regdump(istate);
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    panic("Unhandled exception %s.", exctable[n]);
590 palkovsky 92
}
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1119 palkovsky 94
static void reserved_instr_exception(int n, istate_t *istate)
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{
1780 jermar 96
    if (*((uint32_t *)istate->epc) == 0x7c03e83b) {
1119 palkovsky 97
        ASSERT(THREAD);
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        istate->epc += 4;
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        istate->v1 = istate->k1;
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    } else
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        unhandled_exception(n, istate);
1119 palkovsky 102
}
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958 jermar 104
static void breakpoint_exception(int n, istate_t *istate)
590 palkovsky 105
{
3431 svoboda 106
#ifdef CONFIG_UDEBUG
2924 svoboda 107
    if (istate_from_uspace(istate)) {
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        /* userspace breakpoint */
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        udebug_breakpoint_event(0);
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        return;
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    }
3431 svoboda 112
#endif
2924 svoboda 113
 
614 palkovsky 114
#ifdef CONFIG_DEBUG
958 jermar 115
    debugger_bpoint(istate);
614 palkovsky 116
#else
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    /* it is necessary to not re-execute BREAK instruction after
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       returning from Exception handler
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       (see page 138 in R4000 Manual for more information) */
958 jermar 120
    istate->epc += 4;
614 palkovsky 121
#endif
590 palkovsky 122
}
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958 jermar 124
static void tlbmod_exception(int n, istate_t *istate)
590 palkovsky 125
{
958 jermar 126
    tlb_modified(istate);
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}
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958 jermar 129
static void tlbinv_exception(int n, istate_t *istate)
590 palkovsky 130
{
958 jermar 131
    tlb_invalid(istate);
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}
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615 palkovsky 134
#ifdef CONFIG_FPU_LAZY
958 jermar 135
static void cpuns_exception(int n, istate_t *istate)
590 palkovsky 136
{
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    if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
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        scheduler_fpu_lazy_request();
1595 palkovsky 139
    else {
4377 svoboda 140
        fault_if_from_uspace(istate, "Unhandled Coprocessor Unusable Exception.");
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        panic("Unhandled Coprocessor Unusable Exception.");
1595 palkovsky 142
    }
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}
615 palkovsky 144
#endif
590 palkovsky 145
 
958 jermar 146
static void interrupt_exception(int n, istate_t *istate)
590 palkovsky 147
{
1780 jermar 148
    uint32_t cause;
590 palkovsky 149
    int i;
150
 
151
    /* decode interrupt number and process the interrupt */
4377 svoboda 152
    cause = (cp0_cause_read() >> 8) & 0xff;
590 palkovsky 153
 
1936 decky 154
    for (i = 0; i < 8; i++) {
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        if (cause & (1 << i)) {
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            irq_t *irq = irq_dispatch_and_lock(i);
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            if (irq) {
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                /*
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                 * The IRQ handler was found.
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                 */
4377 svoboda 161
                irq->handler(irq);
1936 decky 162
                spinlock_unlock(&irq->lock);
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            } else {
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                /*
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                 * Spurious interrupt.
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                 */
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#ifdef CONFIG_DEBUG
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                printf("cpu%u: spurious interrupt (inum=%d)\n",
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                    CPU->id, i);
1936 decky 170
#endif
171
            }
172
        }
173
    }
590 palkovsky 174
}
175
 
1096 palkovsky 176
/** Handle syscall userspace call */
177
static void syscall_exception(int n, istate_t *istate)
1 jermar 178
{
4377 svoboda 179
    panic("Syscall is handled through shortcut.");
1 jermar 180
}
590 palkovsky 181
 
182
void exception_init(void)
183
{
184
    int i;
185
 
186
    /* Clear exception table */
1936 decky 187
    for (i = 0; i < IVT_ITEMS; i++)
799 palkovsky 188
        exc_register(i, "undef", (iroutine) unhandled_exception);
1936 decky 189
 
799 palkovsky 190
    exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);
1119 palkovsky 191
    exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);
799 palkovsky 192
    exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);
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    exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);
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    exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);
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    exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);
590 palkovsky 196
#ifdef CONFIG_FPU_LAZY
799 palkovsky 197
    exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);
590 palkovsky 198
#endif
799 palkovsky 199
    exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);
590 palkovsky 200
}
1702 cejka 201
 
1754 jermar 202
/** @}
1702 cejka 203
 */