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sim.c
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sim.c
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#include "sim.h"
int btoi(char *a,int num)//wrong
{
int res=0,i=0;
for(i=0;i<num;++i)
{res=2*res + (a[i]-'0');}
return res;
}
int btoi2(char *a,int num)//wrong
{
if(a[0]=='0')
{
int res=0,i=0;
for(i=0;i<num;++i)
{res=2*res + (a[i]-'0');}
return res;
}
else
{
int i,j;
for(j=num-1;j>=0;--j)
{
if(a[j]=='1')
{break;}
}
a[j]='0';
for(i=j+1;i<num;++i)
{a[i]='1';}
for(i=0;i<num;++i)
{
if(a[i]=='1')
{a[i]='0';}
else
{a[i]='1';}
}
int res=0;
for(i=0;i<num;++i)
{res=2*res + (a[i]-'0');}
return -1*res;
}
}
//1 has to read
//2 has to be written
//str is 32 bits [0...31]
void decode(char * str,int i)
{
int type=-1;
int rs=-1,rt=-1,rd=-1;
int s=-1,t=-1,d=-1;
int offset=-1;
if(strcmp(subst(str,0,6),"100011")==0) //0x23------lw rt,address
{
type=1;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=2;
offset=btoi2(subst(str,16,16),16);
}
else if (strcmp(subst(str,0,6),"101011")==0) //0x2b------st rt,address
{
type=2;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=1;
offset=btoi2(subst(str,16,16),16);
}
else if (strcmp(subst(str,0,6),"000000")==0 && strcmp(subst(str,21,5),"00000")==0 && strcmp(subst(str,26,6),"100000")==0) //0x00------add rd,rs,rt
{
type=3;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=1;
rd=btoi(subst(str,16,5),5); d=2;
}
else if (strcmp(subst(str,0,6),"000000")==0 && strcmp(subst(str,21,5),"00000")==0 && strcmp(subst(str,26,6),"100010")==0) //0x00------sub rd,rs,rt
{
type=4;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=1;
rd=btoi(subst(str,16,5),5); d=2;
}
else if (strcmp(subst(str,0,6),"001000")==0) //------addi rt,rs,imm
{
type=5;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=2;
offset=btoi2(subst(str,16,16),16);
}
else if(strcmp(subst(str,0,6),"000000")==0 && strcmp(subst(str,21,5),"00000")==0 && strcmp(subst(str,26,6),"100100")==0)//and
{
type=6;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=1;
rd=btoi(subst(str,16,5),5); d=2;
}
else if(strcmp(subst(str,0,6),"000000")==0 && strcmp(subst(str,21,5),"00000")==0 && strcmp(subst(str,26,6),"100101")==0)//or
{
type=7;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=1;
rd=btoi(subst(str,16,5),5); d=2;
}
else if (strcmp(subst(str,0,6),"001101")==0) //------ori rt,rs,imm
{
type=8;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=2;
offset=btoi2(subst(str,16,16),16);
}
else if (strcmp(subst(str,0,6),"001111")==0 && strcmp(subst(str,6,5),"00000")==0) //------lui rt,imm
{
type=9;
rt=btoi(subst(str,11,5),5); t=2;
offset=btoi2(subst(str,16,16),16);
}
else if (strcmp(subst(str,0,6),"000000")==0 && strcmp(subst(str,16,10),"0000000000")==0 && strcmp(subst(str,26,6),"011000")==0) //------mult rs,rt
{
type=10;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=1;
}
else if (strcmp(subst(str,0,6),"011100")==0 && strcmp(subst(str,16,10),"0000000000")==0 && strcmp(subst(str,26,6),"000000")==0) //TODO------madd rs,rt
{
type=11;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=1;
}
else if(strcmp(subst(str,0,6),"000000")==0 && strcmp(subst(str,21,5),"00000")==0 && strcmp(subst(str,26,6),"100111")==0) //--nor rd,rs,rt
{
type=12;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=1;
rd=btoi(subst(str,16,5),5); d=2;
}
else if(strcmp(subst(str,0,6),"100000")==0) //0x20------lb rt,address
{
type=13;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=2;
offset=btoi2(subst(str,16,16),16);
}
else if (strcmp(subst(str,0,6),"101000")==0) //0x28------sb rt,address
{
type=14;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=1;
offset=btoi2(subst(str,16,16),16);
}
else if(strcmp(subst(str,0,6),"000000")==0 && strcmp(subst(str,21,5),"00000")==0 && strcmp(subst(str,26,6),"000100")==0) //--sllv rd, rt, rs
{
type=15;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=1;
rd=btoi(subst(str,16,5),5); d=2;
}
else if(strcmp(subst(str,0,6),"000000")==0 && strcmp(subst(str,21,5),"00000")==0 && strcmp(subst(str,26,6),"101011")==0) //--sltu rd, rs, rt
{
type=16;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=1;
rd=btoi(subst(str,16,5),5); d=2;
}
else if(strcmp(subst(str,0,6),"001010")==0) //--slti rt, rs, imm
{
type=17;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=2;
offset=btoi2(subst(str,16,16),16);
}
else if(strcmp(subst(str,0,6),"000000")==0 && strcmp(subst(str,26,6),"000000")==0) //--sll rd, rt, shamt
{
type=18;
rt=btoi(subst(str,11,5),5); t=1;
rd=btoi(subst(str,16,5),5); d=2;
offset=btoi2(subst(str,21,5),5);
}
else if(strcmp(subst(str,0,6),"000100")==0) //--beq rs, rt, label
{
type=19;
rs=btoi(subst(str,6,5),5); s=1;
rt=btoi(subst(str,11,5),5); t=1;
offset=btoi2(subst(str,16,16),16);
}
else if(strcmp(subst(str,0,6),"000001")==0 && strcmp(subst(str,11,5),"00001")==0) //--bgez rs, label
{
type=20;
rs=btoi(subst(str,6,5),5); s=1;
offset=btoi2(subst(str,16,16),16);
}
else if(strcmp(subst(str,0,6),"000111")==0 && strcmp(subst(str,11,5),"00000")==0) //--bgtz rs, labels
{
type=21;
rs=btoi(subst(str,6,5),5); s=1;
offset=btoi2(subst(str,16,16),16);
}
else if(strcmp(subst(str,0,6),"000110")==0 && strcmp(subst(str,11,5),"00000")==0) //--blez rs, label
{
type=22;
rs=btoi(subst(str,6,5),5); s=1;
offset=btoi2(subst(str,16,16),16);
}
else if(strcmp(subst(str,0,6),"000001")==0 && strcmp(subst(str,11,5),"00000")==0) //--bltz rs, label
{
type=23;
rs=btoi(subst(str,6,5),5); s=1;
offset=btoi2(subst(str,16,16),16);
}
if(type==-1)
{printf("Error - Unable to decode instruction no.%d\n",i+1);}
decoded[i].type=type;
decoded[i].id=i+1;
decoded[i].Rs=rs;
decoded[i].Rt=rt;
decoded[i].Rd=rd;
decoded[i].s=s;
decoded[i].t=t;
decoded[i].d=d;
decoded[i].Offset=offset;
decoded[i].invalid=0;
}
void simulate()
{
input_hexin();
//test_hexin();
decoded=(struct INST*)calloc((numins+10),sizeof(struct INST));
int i=0;
for(i=0;i<numins;++i)
{
decode(ins_string[i],i);
}
//test_decode();
//printf("sim1\n");
//fflush(stdout);
execute2();
}
void execute()
{
int curr=0;
while(curr<numins)
{
++iacc;
int type=decoded[curr].type;
int rd=decoded[curr].Rd,rs=decoded[curr].Rs,rt=decoded[curr].Rt;
int offset=decoded[curr].Offset;
if(type==1)
{
int address=reg[rs]+offset;
char ch1=mem[address+0-0x10010000];
char ch2=mem[address+1-0x10010000];
char ch3=mem[address+2-0x10010000];
char ch4=mem[address+3-0x10010000];
int e=256;
reg[rt]=(int)(ch1*e*e*e+ch2*e*e+ch3*e+ch4);
++dacc;
}
else if(type==2)
{
int t=reg[rt];
char ch4=t%256;t/=256;
char ch3=t%256;t/=256;
char ch2=t%256;t/=256;
char ch1=t%256;t/=256;
int address=reg[rs]+offset;
mem[address+0-0x10010000]=ch1;
mem[address+1-0x10010000]=ch2;
mem[address+2-0x10010000]=ch3;
mem[address+3-0x10010000]=ch4;
++dacc;
}
else if(type==3)
{
reg[rd]=reg[rs]+reg[rt];
}
else if(type==4)
{
reg[rd]=reg[rs]-reg[rt];
}
else if(type==5)
{
reg[rt]=reg[rs]+offset;
}
else if(type==6)
{
reg[rd]=reg[rs] & reg[rt];
}
else if(type==7)
{
reg[rd]=reg[rs] | reg[rt];
}
else if(type==8)
{
reg[rt]=reg[rs] | offset;
}
else if(type==9)
{
reg[rt]=(offset<<16);
}
else if(type==10)
{
long long int temp=(long long int)reg[rs]*(long long int)reg[rt];
//hi is 32 , lo is 33
reg[33]=temp%(1LL<<32);
reg[32]=(temp>>32);
}
else if(type==11)//TODO carry
{
//long long int temp=(long long int)reg[rt]*(long long int)reg[rt];
//hi is 32 , lo is 33
}
else if(type==12)
{
reg[rd]= ~(reg[rs] | reg[rt]); // '~' is bitwise not operator
}
else if(type==13)//TODO----sign extended
{
int address=reg[rs]+offset;
char ch1=mem[address+0-0x10010000];
reg[rt]=(int)(ch1);
++dacc;
}
else if(type==14)
{
int t=reg[rt];
char ch4=t%256;//t&255
int address=reg[rs]+offset;
mem[address+0-0x10010000]=ch4;
++dacc;
}
++curr;
}
}
void test_decode()
{
int i=0;
for(i=0;i<numins;++i)
{
printf("type=%d \n",decoded[i].type);
printf("Rs=%d Rt=%d Rd=%d \n",decoded[i].Rs,decoded[i].Rt,decoded[i].Rd);
printf("s =%d t =%d d =%d \n\n",decoded[i].s,decoded[i].t,decoded[i].d);
}
}
char * subst(char *a, int start,int num)
{
char * res;res=(char * )calloc(num,sizeof(char));
int i=0;
for(i=0;i<num;++i)
{res[i]=a[start+i];}
return res;
}