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simulator.c
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simulator.c
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#include "simulator.h"
//unsigned long long int tempCount1=0;
/*
note : -g for debug mode -d for disabling timer interrupt
*/
main(int argc,char **argv){
int intDisable=0,flag_intValue;
initialize_debug();
if(argc >= 2)
{
if(strcmp(argv[1],"--debug") == 0 || strcmp(argv[1],"-d") == 0)
db_mode = ENABLE;
else
{
char *flag_name = strtok(argv[1], "=");
char *flag_value = strtok(NULL, "=");
if(strcmp(flag_name, "--timer") == 0 || strcmp(flag_name, "-t") == 0)
{
flag_intValue = -1;
if(flag_value != NULL)
flag_intValue=getInteger(flag_value);
if(flag_intValue >= 1 && flag_intValue <= 1024)
TIMESLICE = flag_intValue;
else if(flag_intValue == 0)
intDisable = 1;
else
{
printf("Invalid arguement %d to timer flag. Timer value should be between 0 and 1024\n", flag_intValue);
exit(0);
}
}
else
{
printf("Invalid arguement %s", argv[1]);
exit(0);
}
}
}
if(argc == 3)
{
if(strcmp(argv[2],"--debug") == 0 || strcmp(argv[2],"-d") == 0)
db_mode = ENABLE;
else
{
char *flag_name = strtok(argv[2], "=");
char *flag_value = strtok(NULL, "=");
if(strcmp(flag_name, "--timer") == 0 || strcmp(flag_name, "-t") == 0)
{
flag_intValue = -1;
if(flag_value != NULL)
flag_intValue=getInteger(flag_value);
if(flag_intValue >= 1 && flag_intValue <= 1024)
TIMESLICE = flag_intValue;
else if(flag_intValue == 0)
intDisable = 1;
else
{
printf("Invalid arguement %d to timer flag. Timer value should be between 0 and 1024\n", flag_intValue);
exit(0);
}
}
else
{
printf("Invalid arguement %s", argv[2]);
exit(0);
}
}
}
initializeRegs();
time_counter = TIMESLICE;
run(db_mode, intDisable);
}
/*
This function does the following:
1. Loads OS Startup Code.
2. Copies the instruction to be parsed as per the address specified by the IP register.
3. Checks whether interrupt is disabled. If not th clock ticks.
4. Begins the lexical analysis by getting the first token and passing it as arguement to Executeoneinstr.
5. If step flag is enabled enters debug mode
6. Finally checks if time slice allocated is over or not. If yes and mode is user mode ,and if interrupt is enabled then
INT 0 code is run.
*/
void run(int db_mode, int intDisable) {
loadStartupCode();
int instr;
while(1)
{
YY_FLUSH_BUFFER;
if(getInstruction(instruction) == -1) //gets the next instruction in variable instruction
continue;
instr = yylex();
if(mode == USER_MODE && !intDisable)
tick();
Executeoneinstr(instr);
if( (watch_count > 0 && checkWatch() == ENABLE) || step_flag == ENABLE)
debug_interface();
if(is_time_zero() && !intDisable && mode==USER_MODE)
{
reset_timer();
runInt0Code();
if(step_flag == ENABLE)
printf("TIMER Interrupt\n");
}
}
}
/*
This code is used to execute each ininstruction.
*/
void Executeoneinstr(int instr)
{
// printf("\n%d:Enter:%s\n",getInteger(reg[IP_REG]),instruction); //Debugging
int opnd1,opnd2,flag1,flag12,flag2,flag22,oper,result, result2;
int opnd1Value;
int opnd2Value;
int i;
int type,type2;
char string[WORD_SIZE];
char str_result[WORD_SIZE],str_result2[WORD_SIZE];
char charRead;
struct address translatedAddr;
struct address translatedAddr1, translatedAddr2;
switch(instr)
{
case START:
storeInteger(reg[IP_REG],getInteger(reg[IP_REG])+WORDS_PERINSTR); //increment IP
break;
case MOV: //1st phase:get the value 2nd phase:store the value
{
opnd1 = yylex();
flag1 = yylval.flag;
flag12 = yylval.flag2;
opnd2 = yylex();
flag2 = yylval.flag;
flag22 = yylval.flag2;
bzero(string,16);
strcpy(string,yylval.data);
//printf("\n%d:MID:%s\nop1:%d\tfl1:%d\tfl2:%d\nop2:%d\tfl1:%d\tfl2:%d\n",getInteger(reg[IP_REG]),instruction,
//opnd1,flag1,flag12,opnd2,flag2,flag22); //Debugging
switch(flag2)
{
case REG:
if(mode == USER_MODE && opnd2 >= NO_USER_REG)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(opnd2 >= NO_USER_REG + NO_SYS_REG + NO_TEMP_REG)
{
exception("Illegal register access", EX_ILLOPERAND, 0);
return;
}
else
{
type = getType(reg[opnd2]);
strcpy(str_result,reg[opnd2]);
}
break;
case SP:
type = getType(reg[SP_REG]);
strcpy(str_result,reg[SP_REG]);
break;
case BP:
type = getType(reg[BP_REG]);
strcpy(str_result,reg[BP_REG]);
break;
case IP:
if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else
strcpy(str_result,reg[IP_REG]);
break;
case PTBR:
if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else
strcpy(str_result,reg[PTBR_REG]);
break;
case PTLR:
if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else
strcpy(str_result,reg[PTLR_REG]);
break;
case EFR:
if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else
strcpy(str_result,reg[EFR_REG]);
break;
case NUM:
sprintf(str_result,"%d",opnd2);
break;
case STRING:
strcpy(str_result,string);
break;
case MEM_REG:
{
if(mode == USER_MODE)
{
if(opnd2 >= NO_USER_REG)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[opnd2]) == TYPE_STR || getType(reg[PTLR_REG]) == TYPE_STR || getInteger(reg[opnd2]) < 0 || getInteger(reg[opnd2]) >= getInteger(reg[PTLR_REG]) * PAGE_SIZE)
{
exception("Illegal address access1", EX_ILLMEM, 0);
return;
}
}
else
{
if(opnd2 >= NO_USER_REG + NO_SYS_REG + NO_TEMP_REG)
{
exception("Illegal register access", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[opnd2]) == TYPE_STR || getInteger(reg[opnd2]) < 0 || getInteger(reg[opnd2]) >= SIZE_OF_MEM)
{
exception("Illegal address access1", EX_ILLMEM, 0);
return;
}
}
translatedAddr = translate(getInteger(reg[opnd2]));
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(str_result, page[translatedAddr.page_no].word[translatedAddr.word_no]);
break;
}
case MEM_SP:
if(getType(reg[SP_REG]) == TYPE_STR)
{
exception("Illegal address access.\nSP value is out of bounds.", EX_ILLMEM, 0);
return;
}
if(mode == USER_MODE && getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal PTLR value", EX_ILLMEM, 0);
return;
}
if(getInteger(reg[SP_REG]) < 0 || (mode == USER_MODE && getInteger(reg[SP_REG]) >= getInteger(reg[PTLR_REG]) * PAGE_SIZE) || (mode == KERNEL_MODE && getInteger(reg[SP_REG]) >= SIZE_OF_MEM) )
{
exception("Illegal address access.\nSP value is out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(getInteger(reg[SP_REG]));
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(str_result, page[translatedAddr.page_no].word[translatedAddr.word_no]);
break;
case MEM_BP:
if(getType(reg[BP_REG]) == TYPE_STR)
{
exception("Illegal address access.\nBP value is out of bounds.", EX_ILLMEM, 0);
return;
}
if(mode == USER_MODE && getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal PTLR value", EX_ILLMEM, 0);
return;
}
if(getInteger(reg[BP_REG]) < 0 || (mode == USER_MODE && getInteger(reg[BP_REG]) >= getInteger(reg[PTLR_REG]) * PAGE_SIZE) || (mode == KERNEL_MODE && getInteger(reg[BP_REG]) >= SIZE_OF_MEM) )
{
exception("Illegal address access.\nBP value is out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(getInteger(reg[BP_REG]));
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(str_result, page[translatedAddr.page_no].word[translatedAddr.word_no]);
break;
case MEM_IP:
exception("Cannot use memory reference with IP in any mode", EX_ILLOPERAND, 0);
return;
break;
case MEM_PTBR:
if(getType(reg[PTBR_REG]) == TYPE_STR)
{
exception("Illegal PTBR value.", EX_ILLMEM, 0);
return;
}
if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(getInteger(reg[PTBR_REG]) < 0 || getInteger(reg[PTBR_REG]) >= SIZE_OF_MEM)
{
exception("Illegal address access.\nRegister value is out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(getInteger(reg[PTBR_REG]));
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(str_result, page[translatedAddr.page_no].word[translatedAddr.word_no]);
break;
case MEM_PTLR:
if(getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal PTLR value.", EX_ILLMEM, 0);
return;
}
if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(getInteger(reg[PTLR_REG]) < 0 || getInteger(reg[PTLR_REG]) >= SIZE_OF_MEM)
{
exception("Illegal address access.\nRegister value is out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(getInteger(reg[PTLR_REG]));
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(str_result, page[translatedAddr.page_no].word[translatedAddr.word_no]);
break;
case MEM_EFR:
exception("Cannot use memory reference with EFR in any mode", EX_ILLOPERAND, 0);
return;
break;
case MEM_DIR:
if(mode == USER_MODE && getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal PTLR value", EX_ILLMEM, 0);
return;
}
if(opnd2 < 0 || (mode == USER_MODE && opnd2 >= getInteger(reg[PTLR_REG]) * PAGE_SIZE) || (mode == KERNEL_MODE && opnd2 >= SIZE_OF_MEM) )
{
exception("Illegal address access.\nDirect Address value out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(opnd2);
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(str_result, page[translatedAddr.page_no].word[translatedAddr.word_no]);
break;
case MEM_DIR_REG:
if(flag1 == MEM_DIR_REG || flag1 == MEM_DIR_SP || flag1 == MEM_DIR_BP || flag1 == MEM_DIR_PTBR || flag1 == MEM_DIR_PTLR || flag1 == MEM_DIR_IN)
{
exception("Illegal Operands", EX_ILLOPERAND, 0);
return;
}
else if(mode == USER_MODE && flag22 >= NO_USER_REG)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(mode == KERNEL_MODE && flag22 >= NO_USER_REG + NO_SYS_REG + NO_TEMP_REG)
{
exception("Illegal register access", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[flag22]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLOPERAND, 0);
return;
}
else if(mode == USER_MODE && getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLMEM, 0);
return;
}
opnd2 += getInteger(reg[flag22]);
if(opnd2 < 0 || (mode == USER_MODE && opnd2 >= getInteger(reg[PTLR_REG]) * PAGE_SIZE) || (mode == KERNEL_MODE && opnd2 >= SIZE_OF_MEM) )
{
exception("Illegal address access.\nDirect Address value out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(opnd2);
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(str_result, page[translatedAddr.page_no].word[translatedAddr.word_no]);
break;
case MEM_DIR_SP:
if(flag1 == MEM_DIR_REG || flag1 == MEM_DIR_SP || flag1 == MEM_DIR_BP || flag1 == MEM_DIR_PTBR || flag1 == MEM_DIR_PTLR || flag1 == MEM_DIR_IN)
{
exception("Illegal Operands", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[SP_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLOPERAND, 0);
return;
}
else if(mode == USER_MODE && getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLMEM, 0);
return;
}
opnd2 += getInteger(reg[SP_REG]);
if(opnd2 < 0 || (mode == USER_MODE && opnd2 >= getInteger(reg[PTLR_REG]) * PAGE_SIZE) || (mode == KERNEL_MODE && opnd2 >= SIZE_OF_MEM) )
{
exception("Illegal address access.\nDirect Address value out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(opnd2);
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(str_result, page[translatedAddr.page_no].word[translatedAddr.word_no]);
break;
case MEM_DIR_BP:
if(flag1 == MEM_DIR_REG || flag1 == MEM_DIR_SP || flag1 == MEM_DIR_BP || flag1 == MEM_DIR_PTBR || flag1 == MEM_DIR_PTLR || flag1 == MEM_DIR_IN)
{
exception("Illegal Operands", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[BP_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLOPERAND, 0);
return;
}
else if(mode == USER_MODE && getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLMEM, 0);
return;
}
opnd2 += getInteger(reg[BP_REG]);
if(opnd2 < 0 || (mode == USER_MODE && opnd2 >= getInteger(reg[PTLR_REG]) * PAGE_SIZE) || (mode == KERNEL_MODE && opnd2 >= SIZE_OF_MEM) )
{
exception("Illegal address access.\nDirect Address value out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(opnd2);
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(str_result, page[translatedAddr.page_no].word[translatedAddr.word_no]);
break;
case MEM_DIR_IP:
exception("Cannot use memory reference with IP in any mode", EX_ILLOPERAND, 0);
return;
break;
case MEM_DIR_PTBR:
if(flag1 == MEM_DIR_REG || flag1 == MEM_DIR_SP || flag1 == MEM_DIR_BP || flag1 == MEM_DIR_PTBR || flag1 == MEM_DIR_PTLR || flag1 == MEM_DIR_IN)
{
exception("Illegal Operands", EX_ILLOPERAND, 0);
return;
}
else if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[PTBR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLOPERAND, 0);
return;
}
opnd2 += getInteger(reg[PTBR_REG]);
if(opnd2 < 0 || opnd2 >= SIZE_OF_MEM)
{
exception("Illegal address access.\nDirect Address value out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(opnd2);
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(str_result, page[translatedAddr.page_no].word[translatedAddr.word_no]);
break;
case MEM_DIR_PTLR:
if(flag1 == MEM_DIR_REG || flag1 == MEM_DIR_SP || flag1 == MEM_DIR_BP || flag1 == MEM_DIR_PTBR || flag1 == MEM_DIR_PTLR || flag1 == MEM_DIR_IN)
{
exception("Illegal Operands", EX_ILLOPERAND, 0);
return;
}
else if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLOPERAND, 0);
return;
}
opnd2 += getInteger(reg[PTLR_REG]);
if(opnd2 < 0 || opnd2 >= SIZE_OF_MEM)
{
exception("Illegal address access.\nDirect Address value out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(opnd2);
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(str_result, page[translatedAddr.page_no].word[translatedAddr.word_no]);
break;
case MEM_DIR_EFR:
exception("Cannot use memory reference with EFR in any mode", EX_ILLOPERAND, 0);
return;
break;
case MEM_DIR_IN:
if(flag1 == MEM_DIR_REG || flag1 == MEM_DIR_SP || flag1 == MEM_DIR_BP || flag1 == MEM_DIR_PTBR || flag1 == MEM_DIR_PTLR || flag1 == MEM_DIR_IN)
{
exception("Illegal Operands", EX_ILLOPERAND, 0);
return;
}
else if(mode == USER_MODE && getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLMEM, 0);
return;
}
opnd2 += flag22;
if(opnd2 < 0 || (mode == USER_MODE && opnd2 >= getInteger(reg[PTLR_REG]) * PAGE_SIZE) || (mode == KERNEL_MODE && opnd2 >= SIZE_OF_MEM) )
{
exception("Illegal address access.\nDirect Address value out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(opnd2);
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(str_result, page[translatedAddr.page_no].word[translatedAddr.word_no]);
break;
default:
exception("Illegal Operand,default2", EX_ILLOPERAND, 0);
return;
break;
}
switch(flag1)
{
case REG:
if(mode == USER_MODE && opnd1 >= NO_USER_REG)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(opnd1 >= NO_USER_REG + NO_SYS_REG + NO_TEMP_REG)
{
exception("Illegal register access", EX_ILLOPERAND, 0);
return;
}
else
strcpy(reg[opnd1], str_result);
break;
case SP:
strcpy(reg[SP_REG], str_result);
break;
case BP:
strcpy(reg[BP_REG], str_result);
break;
case IP:
exception("Illegal operand IP. Cannot alter readonly register", EX_ILLOPERAND, 0);
return;
break;
case PTBR:
if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else
strcpy(reg[PTBR_REG], str_result);
break;
case PTLR:
if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else
strcpy(reg[PTLR_REG], str_result);
break;
case EFR:
exception("Illegal operand EFR. Cannot alter readonly register", EX_ILLOPERAND, 0);
return;
break;
case MEM_REG:
if(mode == USER_MODE)
{
if(opnd1 >= NO_USER_REG)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[opnd1]) == TYPE_STR || getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLMEM, 0);
return;
}
else if(getInteger(reg[opnd1]) < 0 || getInteger(reg[opnd1]) >= getInteger(reg[PTLR_REG]) * PAGE_SIZE)
{
exception("Illegal address access1", EX_ILLMEM, 0);
return;
}
}
else
{
if(opnd1 >= NO_USER_REG + NO_SYS_REG + NO_TEMP_REG)
{
exception("Illegal register access", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[opnd1]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLMEM, 0);
return;
}
else if(getInteger(reg[opnd1]) < 0 || getInteger(reg[opnd1]) >= SIZE_OF_MEM)
{
exception("Illegal address access1", EX_ILLMEM, 0);
return;
}
}
translatedAddr = translate(getInteger(reg[opnd1]));
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(page[translatedAddr.page_no].word[translatedAddr.word_no], str_result);
break;
case MEM_SP:
if(getType(reg[SP_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLOPERAND, 0);
return;
}
else if(mode == USER_MODE && getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLMEM, 0);
return;
}
else if(getInteger(reg[SP_REG]) < 0 || (mode == USER_MODE && getInteger(reg[SP_REG]) >= getInteger(reg[PTLR_REG]) * PAGE_SIZE) || (mode == KERNEL_MODE && getInteger(reg[SP_REG]) >= SIZE_OF_MEM) )
{
exception("Illegal address access.\nSP value is out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(getInteger(reg[SP_REG]));
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(page[translatedAddr.page_no].word[translatedAddr.word_no], str_result);
break;
case MEM_BP:
if(getType(reg[BP_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLOPERAND, 0);
return;
}
else if(mode == USER_MODE && getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLMEM, 0);
return;
}
else if(getInteger(reg[BP_REG]) < 0 || (mode == USER_MODE && getInteger(reg[BP_REG]) >= getInteger(reg[PTLR_REG]) * PAGE_SIZE) || (mode == KERNEL_MODE && getInteger(reg[BP_REG]) >= SIZE_OF_MEM) )
{
exception("Illegal address access.\nBP value is out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(getInteger(reg[BP_REG]));
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(page[translatedAddr.page_no].word[translatedAddr.word_no], str_result);
break;
case MEM_IP:
exception("Cannot use memory reference with IP in any mode.", EX_ILLOPERAND, 0);
return;
break;
case MEM_PTBR:
if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[PTBR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLOPERAND, 0);
return;
}
else if(getInteger(reg[PTBR_REG]) < 0 || getInteger(reg[PTBR_REG]) >= SIZE_OF_MEM)
{
exception("Illegal address access.\nRegister value is out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(getInteger(reg[PTBR_REG]));
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(page[translatedAddr.page_no].word[translatedAddr.word_no], str_result);
break;
case MEM_PTLR:
if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLOPERAND, 0);
return;
}
else if(getInteger(reg[PTLR_REG]) < 0 || getInteger(reg[PTLR_REG]) >= SIZE_OF_MEM)
{
exception("Illegal address access.\nRegister value is out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(getInteger(reg[PTLR_REG]));
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(page[translatedAddr.page_no].word[translatedAddr.word_no], str_result);
break;
case MEM_EFR:
exception("Cannot use memory reference with EFR in any mode", EX_ILLOPERAND, 0);
return;
break;
case MEM_DIR:
if(mode == USER_MODE && getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLMEM, 0);
return;
}
else if(opnd1 < 0 || (mode == USER_MODE && opnd1 >= getInteger(reg[PTLR_REG]) * PAGE_SIZE) || (mode == KERNEL_MODE && opnd1 >= SIZE_OF_MEM) )
{
exception("Illegal address access4", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(opnd1);
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(page[translatedAddr.page_no].word[translatedAddr.word_no], str_result);
break;
case MEM_DIR_REG:
if(mode == USER_MODE && flag12 >= NO_USER_REG)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(mode == KERNEL_MODE && flag12 >= NO_USER_REG + NO_SYS_REG + NO_TEMP_REG)
{
exception("Illegal register access", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[flag12]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLOPERAND, 0);
return;
}
else if(mode == USER_MODE && getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLMEM, 0);
return;
}
opnd1 += getInteger(reg[flag12]);
if(opnd1 < 0 || (mode == USER_MODE && opnd1 >= getInteger(reg[PTLR_REG]) * PAGE_SIZE) || (mode == KERNEL_MODE && opnd1 >= SIZE_OF_MEM) )
{
exception("Illegal address access.\nDirect Address value out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(opnd1);
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(page[translatedAddr.page_no].word[translatedAddr.word_no], str_result);
break;
case MEM_DIR_SP:
if(getType(reg[SP_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLOPERAND, 0);
return;
}
else if(mode == USER_MODE && getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLMEM, 0);
return;
}
opnd1 += getInteger(reg[SP_REG]);
if(opnd1 < 0 || (mode == USER_MODE && opnd1 >= getInteger(reg[PTLR_REG]) * PAGE_SIZE) || (mode == KERNEL_MODE && opnd1 >= SIZE_OF_MEM) )
{
exception("Illegal address access.\nDirect Address value out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(opnd1);
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(page[translatedAddr.page_no].word[translatedAddr.word_no], str_result);
break;
case MEM_DIR_BP:
if(getType(reg[BP_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLOPERAND, 0);
return;
}
else if(mode == USER_MODE && getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLMEM, 0);
return;
}
opnd1 += getInteger(reg[BP_REG]);
if(opnd1 < 0 || (mode == USER_MODE && opnd1 >= getInteger(reg[PTLR_REG]) * PAGE_SIZE) || (mode == KERNEL_MODE && opnd1 >= SIZE_OF_MEM) )
{
exception("Illegal address access.\nDirect Address value out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(opnd1);
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(page[translatedAddr.page_no].word[translatedAddr.word_no], str_result);
break;
case MEM_DIR_IP:
exception("Cannot use memory reference with IP in any mode", EX_ILLOPERAND, 0);
return;
break;
case MEM_DIR_PTBR:
if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[PTBR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLOPERAND, 0);
return;
}
opnd1 += getInteger(reg[PTBR_REG]);
if(opnd1 < 0 || opnd1 >= SIZE_OF_MEM)
{
exception("Illegal address access.\nDirect Address value out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(opnd1);
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(page[translatedAddr.page_no].word[translatedAddr.word_no], str_result);
break;
case MEM_DIR_PTLR:
if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLOPERAND, 0);
return;
}
opnd1 += getInteger(reg[PTLR_REG]);
if(opnd1 < 0 || opnd1 >= SIZE_OF_MEM)
{
exception("Illegal address access.\nDirect Address value out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(opnd1);
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(page[translatedAddr.page_no].word[translatedAddr.word_no], str_result);
break;
case MEM_DIR_EFR:
exception("Cannot use memory reference with EFR in any mode", EX_ILLOPERAND, 0);
return;
break;
case MEM_DIR_IN:
if(mode == USER_MODE && getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal register value", EX_ILLMEM, 0);
return;
}
opnd1 += flag12;
if(opnd1 < 0 || (mode == USER_MODE && opnd1 >= getInteger(reg[PTLR_REG]) * PAGE_SIZE) || (mode == KERNEL_MODE && opnd1 >= SIZE_OF_MEM) )
{
exception("Illegal address access.\nDirect Address value out of bounds.", EX_ILLMEM, 0);
return;
}
else
translatedAddr = translate(opnd1);
if(translatedAddr.page_no == -1 && translatedAddr.word_no == -1)
return;
strcpy(page[translatedAddr.page_no].word[translatedAddr.word_no], str_result);
break;
default:
exception("Illegal operand", EX_ILLOPERAND, 0);
return;
break;
}
storeInteger(reg[IP_REG],getInteger(reg[IP_REG])+WORDS_PERINSTR);
}
break;
case ARITH:
{
oper = yylval.flag;
opnd1 = yylex();
switch(yylval.flag)
{
case REG:
if(mode == USER_MODE && opnd1 >= NO_USER_REG)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(opnd1 >= NO_USER_REG + NO_SYS_REG + NO_TEMP_REG)
{
exception("Illegal register access", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[opnd1]) == TYPE_STR)
{
exception("Illegal operand1", EX_ILLOPERAND, 0);
return;
}
else
result = opnd1;
break;
case SP:
if(getType(reg[SP_REG]) == TYPE_STR)
{
exception("Illegal operand1", EX_ILLOPERAND, 0);
return;
}
else
result = SP_REG;
break;
case BP:
if(getType(reg[BP_REG]) == TYPE_STR)
{
exception("Illegal operand1", EX_ILLOPERAND, 0);
return;
}
else
result = BP_REG;
break;
case IP:
exception("Illegal operand IP. Cannot alter readonly register", EX_ILLOPERAND, 0);
return;
case PTBR:
if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[PTBR_REG]) == TYPE_STR)
{
exception("Illegal operand1", EX_ILLOPERAND, 0);
return;
}
else
result = PTBR_REG;
break;
case PTLR:
if(mode == USER_MODE)
{
exception("Illegal register access in user mode", EX_ILLOPERAND, 0);
return;
}
else if(getType(reg[PTLR_REG]) == TYPE_STR)
{
exception("Illegal operand1", EX_ILLOPERAND, 0);
return;
}
else
result = PTLR_REG;
break;
case EFR:
exception("Illegal operand EFR. Cannot alter readonly register", EX_ILLOPERAND, 0);
return;
break;
default:
exception("Illegal operand", EX_ILLOPERAND, 0);
return;
}
if(oper!= INR && oper!=DCR)
{
opnd2 = yylex();
flag2 = yylval.flag;
switch(flag2)
{
case REG:
if(mode == USER_MODE && opnd2 >= NO_USER_REG)
{