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/*
* Copyright (c) 2023 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/trap.h>
#include <sys/cdefs.h>
#include <sys/spinlock.h>
#include <sys/syslog.h>
#include <sys/panic.h>
static const char *trap_type[] = {
[TRAP_BREAKPOINT] = "breakpoint",
[TRAP_ARITH_ERR] = "arithmetic error",
[TRAP_OVERFLOW] = "overflow",
[TRAP_BOUND_RANGE] = "bound range exceeded",
[TRAP_INVLOP] = "invalid opcode",
[TRAP_DOUBLE_FAULT] = "double fault",
[TRAP_INVLTSS] = "invalid TSS",
[TRAP_SEGNP] = "segment not present",
[TRAP_PROTFLT] = "general protection",
[TRAP_PAGEFLT] = "page fault",
[TRAP_NMI] = "non-maskable interrupt"
};
static const int TRAP_COUNT = __ARRAY_COUNT(trap_type);
static ftrap_handler_t ftrap_handler = NULL;
static struct spinlock ftrap_handler_lock = { 0 };
static void
trap_print(struct trapframe *tf)
{
const char *mode;
if (tf->trapno < TRAP_COUNT) {
kprintf("** Fatal %s", trap_type[tf->trapno]);
} else {
kprintf("** Unknown trap %d", tf->trapno);
}
mode = __TEST(tf->trapno, TRAP_USER) ? "user" : "supervisor";
kprintf(" in %s mode **\n", mode);
}
/*
* Registers a handler for
* *fatal* traps.
*
* => Can block
*/
void
register_ftrap_handler(ftrap_handler_t handler)
{
spinlock_acquire(&ftrap_handler_lock);
ftrap_handler = handler;
spinlock_release(&ftrap_handler_lock);
}
/*
* Handles traps.
*
* => Can block
*/
void
trap_handler(struct trapframe *tf)
{
trap_print(tf);
/*
* XXX: Handle NMIs better. For now we just
* panic.
*/
if (tf->trapno == TRAP_NMI) {
kprintf("Possible hardware failure?\n");
panic("Caught NMI; bailing out\n");
}
panic("Caught pre-sched exception\n");
}
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