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TMSC64XX DSP混合汇编2

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Release: 2016-06-07 15:43:03
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自己研究了一个星期还是没什么进展!自己写的代码和大家分享,希望对大家有帮助! extern int a = 0; //定义外部变量,但要先赋值。 extern int asmfunc(int); //汇编函数 int main() { int ret = 1; ret = asmfunc(ret); printf("ret is %d/n",ret); } .glo

自己研究了一个星期还是没什么进展!自己写的代码和大家分享,希望对大家有帮助!

extern int a = 0;        //定义外部变量,但要先赋值。
extern int asmfunc(int);  //汇编函数

int main()
{
int ret = 1;
ret = asmfunc(ret);
printf("ret is %d/n",ret);

}

 

  .global _asmfunc     //调用C函数

  .global _a                //调用C的变量
   

_asmfunc:
        mvk .S 12,a2
        STW .D a2,*b14(_a)        //给变量a赋值
        LDW .D *+b14(_a),a3      //把变量的值赋给a3寄存器
        NOP 4
        add .L   a3,a4,a3
        STW .D  a3,*b14(_a)
        mv  .S a3,a4
        STW .D a3,*b14(_a)
        mv  .S a3,a4
        mvk .S _a,a2
        B   .S B3
        NOP 5
       .end

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