tools: acrn-crashlog: framework of acrn-crashlog

This is the first patch of acrn-crashlog.

This patch initializes the framework of acrn-crashlog: acrnprobe,
common, data, and usercrash. And it initializes the Makefile for
each part.

Signed-off-by: Liu Xinwu <xinwu.liu@intel.com>
Signed-off-by: CHEN Gang <gang.c.chen@intel.com>
Reviewed-by: Zhang Yanmin <yanmin.zhang@intel.com>
Reviewed-by: Liu Chuansheng <chuansheng.liu@intel.com>
Reviewed-by: Zhao Yakui <yakui.zhao@intel.com>
Reviewed-by: Geoffroy Van Cutsem <geoffroy.vancutsem@intel.com>
Acked-by: Eddie Dong <Eddie.dong@intel.com>

tools/acrn-crashlog/common/log_sys.c

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) <2018> Intel Corporation
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <systemd/sd-journal.h>
+#include "log_sys.h"
+
+void do_log(int level,
+#ifdef DEBUG_ACRN_CRASHLOG
+			const char *func, int line,
+#endif
+			...)
+{
+	va_list args;
+	char *fmt;
+	char log[MAX_LOG_LEN] = {0};
+#ifdef DEBUG_ACRN_CRASHLOG
+	char header_fmt[] = "<%-20s%d>: ";
+#endif
+
+	if (level > LOG_LEVEL)
+		return;
+
+#ifdef DEBUG_ACRN_CRASHLOG
+	va_start(args, line);
+#else
+	va_start(args, level);
+#endif
+	fmt = va_arg(args, char *);
+	if (!fmt)
+		return;
+
+#ifdef DEBUG_ACRN_CRASHLOG
+	/* header */
+	snprintf(log, sizeof(log) - 1, header_fmt, func, line);
+#endif
+	/* msg */
+	vsnprintf(log + strlen(log), sizeof(log) - strlen(log) - 1, fmt, args);
+	va_end(args);
+
+	sd_journal_print(level, log);
+}