实现gettimeofday()系统调用和clocksource+timekeeping子模块 (#278)

- 实现gettimeofday()系统调用
- 实现clocksource+timekeeping子模块部分功能
- 实现了timespec转换成日期时间

user/apps/test_gettimeofday/Makefile

@@ -0,0 +1,25 @@
+CC=$(DragonOS_GCC)/x86_64-elf-gcc
+LD=ld
+OBJCOPY=objcopy
+# 修改这里，把它改为你的relibc的sysroot路径
+RELIBC_OPT=$(DADK_BUILD_CACHE_DIR_RELIBC_0_1_0)
+CFLAGS=-I $(RELIBC_OPT)/include
+
+tmp_output_dir=$(ROOT_PATH)/bin/tmp/user
+output_dir=$(DADK_BUILD_CACHE_DIR_TEST_GETTIMEOFDAY_0_1_0)
+
+LIBC_OBJS:=$(shell find $(RELIBC_OPT)/lib -name "*.o" | sort )
+LIBC_OBJS+=$(RELIBC_OPT)/lib/libc.a
+
+all: main.o
+	mkdir -p $(tmp_output_dir)
+	
+	$(LD) -b elf64-x86-64 -z muldefs -o $(tmp_output_dir)/test_gettimeofday  $(shell find . -name "*.o") $(LIBC_OBJS) -T link.lds
+
+	$(OBJCOPY) -I elf64-x86-64 -R ".eh_frame" -R ".comment" -O elf64-x86-64 $(tmp_output_dir)/test_gettimeofday $(output_dir)/test_gettimeofday.elf
+	mv $(output_dir)/test_gettimeofday.elf $(output_dir)/test_gettimeofday
+main.o: main.c
+	$(CC) $(CFLAGS) -c main.c  -o main.o
+
+clean:
+	rm -f *.o