/*
 * hal_trap.c - Trap handler
 * 
 * Copyright (c) 2017 Maxime Villard
 * 
 * This file is part of ALMOS-MKH.
 *
 * ALMOS-MKH is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2.0 of the License.
 *
 * ALMOS-MKH is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ALMOS-MKH.; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <hal_types.h>
#include <hal_kentry.h>

static const char *trap_type[] = {
	[T_PRIVINFLT]= "privileged instruction fault",
	[T_BPTFLT] = "breakpoint trap",
	[T_ARITHTRAP] = "arithmetic trap",
	[T_ASTFLT] = "asynchronous system trap",
	[T_PROTFLT] = "protection fault",
	[T_TRCTRAP] = "trace trap",
	[T_PAGEFLT] = "page fault",
	[T_ALIGNFLT] = "alignment fault",
	[T_DIVIDE] = "integer divide fault",
	[T_NMI] = "non-maskable interrupt",
	[T_OFLOW] = "overflow trap",
	[T_BOUND] = "bounds check fault",
	[T_DNA] = "FPU not available fault",
	[T_DOUBLEFLT] = "double fault",
	[T_FPOPFLT] = "FPU operand fetch fault",
	[T_TSSFLT] = "invalid TSS fault",
	[T_SEGNPFLT] = "segment not present fault",
	[T_STKFLT] = "stack fault",
	[T_MCA] = "machine check fault",
	[T_XMM] = "SSE FP exception",
};
int	trap_types = __arraycount(trap_type);

void x86_printf(char *msg); // XXX

/*
 * Trap handler.
 */
void
hal_trap_entry(struct small_trapframe *tf)
{
	uint64_t trapno = tf->tf_trapno;
	char *buf;

	if (trapno < trap_types) {
		buf = trap_type[trapno];
	} else {
		buf = "unknown trap";
	}

	x86_printf("\n");
	x86_printf("****** FAULT OCCURRED ******\n");
	x86_printf(buf);
	x86_printf("\n");
	x86_printf("****** FAULT OCCURRED ******\n");
	x86_printf("\n");

	while (1);
}