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decode.lex
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%{
#include "instr.h"
#include "data.h"
#include "interrupt.h"
#define BLANK_THRESHOLD 10
#define YY_INPUT(buf,result,max_size) \
{ \
int len; \
bzero(buf,max_size); \
strcpy(buf, instruction); \
len = strlen(buf); \
result = len; \
}
char tempbuf[16];
int tempnum;
int blank_count;
void decode_indexed_addr(char location[],char index[]);
%}
%option noyywrap
%%
START { blank_count=0; return(START);}
MOV { yylval.flag=0; yylval.flag2=0; blank_count=0; return(MOV); }
ADD { yylval.flag=ADD; yylval.flag2=0; blank_count=0; return(ARITH); }
SUB { yylval.flag=SUB; yylval.flag2=0; blank_count=0; return(ARITH); }
MUL { yylval.flag=MUL; yylval.flag2=0; blank_count=0; return(ARITH); }
DIV { yylval.flag=DIV; yylval.flag2=0; blank_count=0; return(ARITH); }
MOD { yylval.flag=MOD; yylval.flag2=0; blank_count=0; return(ARITH); }
INR { yylval.flag=INR; yylval.flag2=0; blank_count=0; return(ARITH); }
DCR { yylval.flag=DCR; yylval.flag2=0; blank_count=0; return(ARITH); }
LT { yylval.flag=LT; yylval.flag2=0; blank_count=0; return(LOGIC); }
GT { yylval.flag=GT; yylval.flag2=0; blank_count=0; return(LOGIC); }
EQ { yylval.flag=EQ; yylval.flag2=0; blank_count=0; return(LOGIC); }
NE { yylval.flag=NE; yylval.flag2=0; blank_count=0; return(LOGIC); }
GE { yylval.flag=GE; yylval.flag2=0; blank_count=0; return(LOGIC); }
LE { yylval.flag=LE; yylval.flag2=0; blank_count=0; return(LOGIC); }
JZ { yylval.flag=JZ; yylval.flag2=0; blank_count=0; return(BRANCH); }
JNZ { yylval.flag=JNZ; yylval.flag2=0; blank_count=0; return(BRANCH); }
JMP { yylval.flag=JMP; yylval.flag2=0; blank_count=0; return(BRANCH); }
PUSH { yylval.flag=0; yylval.flag2=0; blank_count=0; return(PUSH); }
POP { yylval.flag=0; yylval.flag2=0; blank_count=0; return(POP); }
CALL { yylval.flag=0; yylval.flag2=0; blank_count=0; return(CALL); }
RET { yylval.flag=0; yylval.flag2=0; blank_count=0; return(RET); }
IN { yylval.flag=0; yylval.flag2=0; blank_count=0; return(IN); }
OUT { yylval.flag=0; yylval.flag2=0; blank_count=0; return(OUT); }
LOAD { yylval.flag=0; yylval.flag2=0; blank_count=0; return(LOAD); }
STORE { yylval.flag=0; yylval.flag2=0; blank_count=0; return(STORE); }
HALT { yylval.flag=0; yylval.flag2=0; blank_count=0; return(HALT); }
INT { yylval.flag=0; yylval.flag2=0; blank_count=0; return(INT); }
END { yylval.flag=0; yylval.flag2=0; blank_count=0; return(END); }
BRKP { yylval.flag=0; yylval.flag2=0; blank_count=0; return(BRKP); }
IRET { yylval.flag=0; yylval.flag2=0; blank_count=0; return(IRET);}
SP { yylval.flag=SP; yylval.flag2=0; blank_count=0; return(0); }
BP { yylval.flag=BP; yylval.flag2=0; blank_count=0; return(0); }
IP { yylval.flag=IP; yylval.flag2=0; blank_count=0; return(0); }
PTBR { yylval.flag=PTBR; yylval.flag2=0; blank_count=0; return(0); }
PTLR { yylval.flag=PTLR; yylval.flag2=0; blank_count=0; return(0); }
EFR { yylval.flag=EFR; yylval.flag2=0; blank_count=0; return(0); }
R[0-9]+ {
yylval.flag=REG; yylval.flag2=0;
yytext++;
tempnum = atoi(yytext);
blank_count=0;
if(tempnum > 7)
return ILLREG;
return(tempnum + R0);
}
S[0-9]+ {
yylval.flag=REG; yylval.flag2=0;
yytext++;
tempnum = atoi(yytext);
blank_count=0;
if(tempnum > 15)
return ILLREG;
return(tempnum + S0);
}
T[0-9]+ {
yylval.flag=REG; yylval.flag2=0;
yytext++;
tempnum = atoi(yytext);
blank_count=0;
if(tempnum > 3)
return ILLREG;
return(tempnum + T0);
}
\[SP\] { yylval.flag=MEM_SP; yylval.flag2=0; blank_count=0; return(0); }
\[BP\] { yylval.flag=MEM_BP; yylval.flag2=0; blank_count=0; return(0); }
\[IP\] { yylval.flag=MEM_IP; yylval.flag2=0; blank_count=0; return(0); } //error: Is this needed.
\[PTBR\] { yylval.flag=MEM_PTBR; yylval.flag2=0; blank_count=0; return(0); }
\[PTLR\] { yylval.flag=MEM_PTLR; yylval.flag2=0; blank_count=0; return(0); }
\[EFR\] { yylval.flag=MEM_EFR; yylval.flag2=0; blank_count=0; return(0); }
\[R[0-9]+\] {
yylval.flag=MEM_REG; yylval.flag2=0;
yytext[yyleng-1]='\0';
yytext=yytext+2;
tempnum = atoi(yytext);
blank_count=0;
if(tempnum > 7)
return ILLREG;
return(tempnum + R0);
}
\[S[0-9]+\] {
yylval.flag=MEM_REG; yylval.flag2=0;
yytext[yyleng-1]='\0';
yytext=yytext+2;
tempnum = atoi(yytext);
blank_count=0;
if(tempnum > 15)
return ILLREG;
return(tempnum + S0);
}
\[T[0-9]+\] {
yylval.flag=MEM_REG; yylval.flag2=0;
yytext[yyleng-1]='\0';
yytext=yytext+2;
tempnum = atoi(yytext);
blank_count=0;
if(tempnum > 3)
return ILLREG;
return(tempnum + T0);
}
-?[0-9]+ { yylval.flag=NUM; yylval.flag2=0; blank_count=0; return(atoi(yytext)); }
\[[0-9]+\] {
yylval.flag=MEM_DIR; yylval.flag2=0;
yytext[yyleng-1]='\0';
yytext++;
blank_count=0; return(atoi(yytext));
}
\[-?[0-9]+\]R[0-9]+ {
yylval.flag=MEM_DIR_REG;
yytext++;
decode_indexed_addr(yytext,tempbuf); //Not at all tested. Vulnerable ***
tempnum = atoi(tempbuf);
if(tempnum > 7)
yylval.flag2 = ILLREG;
else
yylval.flag2= tempnum + R0;
blank_count=0; return(atoi(yytext));
}
\[-?[0-9]+\]S[0-9]+ {
yylval.flag=MEM_DIR_REG;
yytext++;
decode_indexed_addr(yytext,tempbuf); //Not at all tested. Vulnerable ***
tempnum = atoi(tempbuf);
if(tempnum > 15)
yylval.flag2 = ILLREG;
else
yylval.flag2= tempnum + S0;
blank_count=0; return(atoi(yytext));
}
\[-?[0-9]+\]T[0-9]+ {
yylval.flag=MEM_DIR_REG;
yytext++;
decode_indexed_addr(yytext,tempbuf); //Not at all tested. Vulnerable ***
tempnum = atoi(tempbuf);
if(tempnum > 3)
yylval.flag2 = ILLREG;
else
yylval.flag2= tempnum + T0;
blank_count=0; return(atoi(yytext));
}
\[-?[0-9]+\]SP {
yylval.flag=MEM_DIR_SP;
yytext++;
decode_indexed_addr(yytext,tempbuf); //Not at all tested. Vulnerable ***
yylval.flag2=SP_REG;
blank_count=0; return(atoi(yytext));
}
\[-?[0-9]+\]BP {
yylval.flag=MEM_DIR_BP;
yytext++;
decode_indexed_addr(yytext,tempbuf); //Not at all tested. Vulnerable ***
yylval.flag2=BP_REG;
blank_count=0; return(atoi(yytext));
}
\[-?[0-9]+\]IP {
yylval.flag=MEM_DIR_IP;
yytext++;
decode_indexed_addr(yytext,tempbuf); //Not at all tested. Vulnerable ***
yylval.flag2=IP_REG;
blank_count=0; return(atoi(yytext));
}
\[-?[0-9]+\]PTBR {
yylval.flag=MEM_DIR_PTBR;
yytext++;
decode_indexed_addr(yytext,tempbuf); //Not at all tested. Vulnerable ***
yylval.flag2=PTBR_REG;
blank_count=0; return(atoi(yytext));
}
\[-?[0-9]+\]PTLR {
yylval.flag=MEM_DIR_PTLR;
yytext++;
decode_indexed_addr(yytext,tempbuf); //Not at all tested. Vulnerable ***
yylval.flag2=PTLR_REG;
blank_count=0; return(atoi(yytext));
}
\[-?[0-9]+\]EFR {
yylval.flag=MEM_DIR_EFR;
yytext++;
decode_indexed_addr(yytext,tempbuf); //Not at all tested. Vulnerable ***
yylval.flag2=EFR_REG;
blank_count=0; return(atoi(yytext));
}
\[-?[0-9]+\]-?[0-9]+ {
yylval.flag=MEM_DIR_IN;
yytext++;
decode_indexed_addr(yytext,tempbuf); //Not at all tested. Vulnerable ***
yylval.flag2=atoi(tempbuf);
blank_count=0; return(atoi(yytext));
}
\"[^"]* {
if(yytext[yyleng-1] == '\\')
yymore();
else
{
yytext[yyleng]='\0';
yytext++;
strcpy(yylval.data,yytext);
yylval.flag=STRING; yylval.flag2=0;
blank_count=0; return(0);
}
}
[\n\t ] {blank_count++;
if(blank_count == BLANK_THRESHOLD)
return(ILLTOKEN);
}
\/\/.* {blank_count=0;}
[,] ;
. {blank_count=0; return(ILLTOKEN);}
%%
/*
Splits the token of the form "[location]index" to location and index
*/
void decode_indexed_addr(char location[],char index[]) //Not at all tested. Vulnerable ***
{
int i,flag,j;
for(i=0,j=0,flag=0;location[i]!='\0';i++,j++)
{
if(location[i] == ']')
{
flag = 1;
j=0;
location[i]='\0';
if(location[i+1] == 'R' || location[i+1] == 'S' || location[i+1] == 'T')
{
i++;
location[i]='\0';
}
}
if(flag == 1)
index[j] = location[i];
}
index[j]='\0';
}