kernel: implement panic()

kernel/panic.c

@@ -0,0 +1,42 @@
+#include <stdarg.h>
+#include <socks/machine/panic.h>
+#include <socks/libc/stdio.h>
+#include <socks/printk.h>
+#include <socks/sched.h>
+#include <socks/cpu.h>
+
+static int has_panicked = 0;
+
+void panic(const char *fmt, ...)
+{
+	char buf[512];
+	va_list args;
+	va_start(args, fmt);
+	vsnprintf(buf, sizeof(buf), fmt, args);
+	va_end(args);
+
+	printk("---[ kernel panic: %s", buf);
+	printk("kernel: " BUILD_ID ", compiler version: " __VERSION__);
+
+	task_t *task = current_task();
+	thread_t *thr = current_thread();
+
+	if (task && thr) {
+		printk("task: %s (id: %d, thread: %d)", task->t_name, task->t_id, thr->tr_id);
+	} else {
+		printk("task: [bootstrap]");
+	}
+
+	printk("cpu: %u", this_cpu());
+
+	ml_print_cpu_state(NULL);
+
+	if (READ_ONCE(has_panicked)) {
+		ml_halt_cpu();
+	}
+
+	WRITE_ONCE(has_panicked, 1);
+
+	printk("---[ end kernel panic: %s", buf);
+	ml_halt_cpu();
+}