/*
 * Copyright (C) 2025 Danny Holman <dholman@gymli.org>
 *
 * This file is part of BoxOS, a free and open-source Unix-like operating
 * system.
 *
 * BoxOS is free software; you can redistribute it and/or modify under the
 * terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * BoxOS is distributed in the hope 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
 * BoxOS; if not, see <https://www.gnu.org/licenses/>.
 */

#include <sys/panic.h>
#include <sys/kprintf.h>
#include <sys/spinlock.h>
#include <sys/asm.h>
#include <stdint.h>
#include <stddef.h>

static struct spinlock panic_lock = {0};
static int panicked = 0;

void walk_stack(uintptr_t *addrs, size_t n);

void stack_trace(void) {
        kprintf("PRINTING STACK TRACE\n");
        uintptr_t strace[32];
        walk_stack(strace, 32);
        for (int i = 0; i < 32; i++) {
                if (strace[i] == 0)
                        break;
                kprintf("#%d: %x\n", i, strace[i]);
        }
}

void panic(const char *str) {
        disable_ints();
        spin_lock(&panic_lock);
        panicked = 1;
        spin_unlock(&panic_lock);
        kprintf("KERNEL PANIC - NOT SYNCING: %s\n", str);
        stack_trace();
        while (1);
}