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575 palkovsky 1
/*
2071 jermar 2
 * Copyright (c) 2005 Ondrej Palkovsky
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 * 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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1757 jermar 29
/** @addtogroup genericinterrupt
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 * @{
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 */
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/**
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 * @file
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 * @brief   Interrupt redirector.
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 *
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 * This file provides means of registering interrupt handlers
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 * by kernel functions and calling the handlers when interrupts
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 * occur.
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 */
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#include <interrupt.h>
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#include <debug.h>
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#include <console/kconsole.h>
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#include <console/console.h>
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#include <console/chardev.h>
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#include <console/cmd.h>
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#include <panic.h>
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#include <print.h>
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#include <symtab.h>
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static struct {
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    const char *name;
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    iroutine f;
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} exc_table[IVT_ITEMS];
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SPINLOCK_INITIALIZE(exctbl_lock);
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/** Register exception handler
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 *
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 * @param n Exception number
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 * @param name Description
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 * @param f Exception handler
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 */
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iroutine exc_register(int n, const char *name, iroutine f)
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{
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    ASSERT(n < IVT_ITEMS);
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    iroutine old;
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    spinlock_lock(&exctbl_lock);
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    old = exc_table[n].f;
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    exc_table[n].f = f;
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    exc_table[n].name = name;
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    spinlock_unlock(&exctbl_lock); 
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    return old;
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}
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/** Dispatch exception according to exception table
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 *
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 * Called directly from the assembler code.
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 * CPU is interrupts_disable()'d.
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 */
958 jermar 86
void exc_dispatch(int n, istate_t *istate)
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{
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    ASSERT(n < IVT_ITEMS);
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#ifdef CONFIG_UDEBUG
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    if (THREAD) THREAD->udebug.uspace_state = istate;
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#endif
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958 jermar 94
    exc_table[n].f(n + IVT_FIRST, istate);
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#ifdef CONFIG_UDEBUG
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    if (THREAD) THREAD->udebug.uspace_state = NULL;
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#endif
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    /* This is a safe place to exit exiting thread */
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    if (THREAD && THREAD->interrupted && istate_from_uspace(istate))
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        thread_exit();
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}
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/** Default 'null' exception handler */
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static void exc_undef(int n, istate_t *istate)
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{
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    fault_if_from_uspace(istate, "Unhandled exception %d.", n);
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    panic("Unhandled exception %d.", n);
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}
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664 jermar 112
/** kconsole cmd - print all exceptions */
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static int exc_print_cmd(cmd_arg_t *argv)
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{
2745 decky 115
#if (IVT_ITEMS > 0)
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    unsigned int i;
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    char *symbol;
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    spinlock_lock(&exctbl_lock);
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#ifdef __32_BITS__
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    printf("Exc Description          Handler    Symbol\n");
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    printf("--- -------------------- ---------- --------\n");
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#endif
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#ifdef __64_BITS__
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    printf("Exc Description          Handler            Symbol\n");
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    printf("--- -------------------- ------------------ --------\n");
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#endif
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    for (i = 0; i < IVT_ITEMS; i++) {
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        symbol = get_symtab_entry((unative_t) exc_table[i].f);
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        if (!symbol)
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            symbol = "not found";
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#ifdef __32_BITS__
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        printf("%-3u %-20s %10p %s\n", i + IVT_FIRST, exc_table[i].name,
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            exc_table[i].f, symbol);
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#endif
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#ifdef __64_BITS__
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        printf("%-3u %-20s %18p %s\n", i + IVT_FIRST, exc_table[i].name,
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            exc_table[i].f, symbol);
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#endif
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        if (((i + 1) % 20) == 0) {
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            printf(" -- Press any key to continue -- ");
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            spinlock_unlock(&exctbl_lock);
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            getc(stdin);
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            spinlock_lock(&exctbl_lock);
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            printf("\n");
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        }
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    }
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    spinlock_unlock(&exctbl_lock);
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#endif
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    return 1;
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}
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static cmd_info_t exc_info = {
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    .name = "exc",
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    .description = "Print exception table.",
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    .func = exc_print_cmd,
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    .help = NULL,
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    .argc = 0,
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    .argv = NULL
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};
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/** Initialize generic exception handling support */
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void exc_init(void)
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{
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    int i;
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3149 svoboda 175
    for (i = 0; i < IVT_ITEMS; i++)
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        exc_register(i, "undef", (iroutine) exc_undef);
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    cmd_initialize(&exc_info);
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    if (!cmd_register(&exc_info))
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        panic("could not register command %s\n", exc_info.name);
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}
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/** @}
1702 cejka 184
 */