发布：驱动大全之同步与互斥

07_驱动大全/source/01_inline_assembly/01_c_code/Makefile

@@ -0,0 +1,6 @@
+test: main.c
+	arm-linux-gnueabihf-gcc -o $@ $^
+
+clean:
+	rm test
+	

07_驱动大全/source/01_inline_assembly/01_c_code/main.c

@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int add(int a, int b)
+{
+	return a+b;
+}
+
+int main(int argc, char **argv)
+{
+	int a;
+	int b;
+	
+	if (argc != 3)
+	{
+		printf("Usage: %s <val1> <val2>\n", argv[0]);
+		return -1;
+	}
+
+	a = (int)strtol(argv[1], NULL, 0);	
+	b = (int)strtol(argv[2], NULL, 0);	
+
+	printf("%d + %d = %d\n", a, b, add(a, b));
+	return 0;
+}
+

07_驱动大全/source/01_inline_assembly/02_assembly/Makefile

@@ -0,0 +1,8 @@
+CROSS=arm-linux-gnueabihf-
+
+test: main.c add.S
+	$(CROSS)gcc -o $@ $^
+	$(CROSS)objdump -D $@ > $@.dis
+clean:
+	rm test
+	

07_驱动大全/source/01_inline_assembly/02_assembly/add.S

@@ -0,0 +1,8 @@
+.text            // 放在代码段
+.global  add     // 实现全局函数add
+.thumb           // 使用thumb指令, main.c默认使用thumb指令, 所以这里也使用thumb指令
+
+add:
+	add r0, r0, r1
+	bx lr
+	

07_驱动大全/source/01_inline_assembly/02_assembly/main.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+extern int add(int a, int b);
+
+int main(int argc, char **argv)
+{
+	int a;
+	int b;
+	
+	if (argc != 3)
+	{
+		printf("Usage: %s <val1> <val2>\n", argv[0]);
+		return -1;
+	}
+
+	a = (int)strtol(argv[1], NULL, 0);	
+	b = (int)strtol(argv[2], NULL, 0);	
+
+	printf("%d + %d = %d\n", a, b, add(a, b));
+	return 0;
+}
+

07_驱动大全/source/01_inline_assembly/03_inline_assembly/Makefile

@@ -0,0 +1,8 @@
+CROSS=arm-linux-gnueabihf-
+
+test: main.c
+	$(CROSS)gcc -o $@ $^
+	$(CROSS)objdump -D $@ > $@.dis
+clean:
+	rm test
+	

07_驱动大全/source/01_inline_assembly/03_inline_assembly/main.c

@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int add(int a, int b)
+{
+	int sum;
+	__asm__ volatile (
+		"add %0, %1, %2"
+		:"=r"(sum)
+		:"r"(a), "r"(b)
+		:"cc"
+	);
+	return sum;
+}
+
+int main(int argc, char **argv)
+{
+	int a;
+	int b;
+	
+	if (argc != 3)
+	{
+		printf("Usage: %s <val1> <val2>\n", argv[0]);
+		return -1;
+	}
+
+	a = (int)strtol(argv[1], NULL, 0);	
+	b = (int)strtol(argv[2], NULL, 0);	
+
+	printf("%d + %d = %d\n", a, b, add(a, b));
+	return 0;
+}
+

07_驱动大全/source/01_inline_assembly/03_inline_assembly/main2.c

@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int add(int a, int b)
+{
+	int sum;
+	__asm__ volatile (
+		"add %[result], %[val1], %[val2]"
+		:[result]"=r"(sum)
+		:[val1]"r"(a), [val2]"r"(b)
+		:"cc"
+	);
+	return sum;
+}
+
+int main(int argc, char **argv)
+{
+	int a;
+	int b;
+	
+	if (argc != 3)
+	{
+		printf("Usage: %s <val1> <val2>\n", argv[0]);
+		return -1;
+	}
+
+	a = (int)strtol(argv[1], NULL, 0);	
+	b = (int)strtol(argv[2], NULL, 0);	
+
+	printf("%d + %d = %d\n", a, b, add(a, b));
+	return 0;
+}
+

07_驱动大全/source/01_inline_assembly/04_earlyclobber/Makefile

@@ -0,0 +1,8 @@
+CROSS=arm-linux-gnueabihf-
+
+test: main.c
+	$(CROSS)gcc -o $@ $^
+	$(CROSS)objdump -D $@ > $@.dis
+clean:
+	rm test
+	

07_驱动大全/source/01_inline_assembly/04_earlyclobber/main.c

@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int add(int a, int b)
+{
+	int sum;
+	__asm__ volatile (
+		"add %0, %1, %2\n"
+		"add %1, #1\n"
+		"add %2, #1\n"
+		:"=&r"(sum)
+		:"r"(a), "r"(b)
+		:"cc"
+	);
+	return sum;
+}
+
+int main(int argc, char **argv)
+{
+	int a;
+	int b;
+	
+	if (argc != 3)
+	{
+		printf("Usage: %s <val1> <val2>\n", argv[0]);
+		return -1;
+	}
+
+	a = (int)strtol(argv[1], NULL, 0);	
+	b = (int)strtol(argv[2], NULL, 0);	
+
+	printf("%d + %d = %d\n", a, b, add(a, b));
+	return 0;
+}
+