05 内嵌汇编的编程

说明：参考狄泰软件学院相关课程

 

 

 

 

 

 

 示例如下：

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#include <stdio.h>   int main() {     int result = 0;     int input = 1;           int a = 1;     int b = 2;           asm volatile (         "movl %1, %0\n"         : "=r"(result)         : "r"(input)         );               printf("result = %d\n", result);     printf("input = %d\n", input);           asm volatile (         "movl %%eax, %%ecx\n"         "movl %%ebx, %%eax\n"         "movl %%ecx, %%ebx\n"         : "=a"(a), "=b"(b)         : "a"(a), "b"(b)         );               printf("a = %d\n", a);     printf("b = %d\n", b);           return 0; }

 结果如下：

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result = 1 input = 1 a = 2 b = 1

　　

 

 

 

 

 

 

 

 

 示例代码：

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#include <stdio.h>   int main() {     char* s = "D.T.Software\n";     int l = 13;           printf("main begin\n");           asm volatile(         "movl $4, %%eax\n"         "movl $1, %%ebx\n"         "movl %0, %%ecx\n"         "movl %1, %%edx\n"         "int $0x80     \n"         :         : "r"(s), "r"(l)         : "eax", "ebx", "ecx", "edx"     );                 asm volatile(         "movl $1,  %eax\n"         "movl $42, %ebx\n"         "int $0x80     \n"     );                 printf("main end\n");           return 0; }

运行结果：