Курсовая работа: Проектування комп'ютера
! strcmp (opcode,
"lw") ||! strcmp (opcode, "sw") ||
! strcmp (opcode,
"beq") ||! strcmp (opcode, "jalr") ||
! strcmp (opcode,
"div") ||! strcmp (opcode, "imul") ||
! strcmp (opcode,
"xidiv") ||! strcmp (opcode, "andf") ||
! strcmp (opcode,
"xorf") ||! strcmp (opcode, "cmpge") ||
! strcmp (opcode,
"bsf") ||! strcmp (opcode, "bsr"))
{
testRegArg (arg0);
testRegArg (arg1);
}
if (! strcmp (opcode,
"nand") ||! strcmp (opcode, "add") ||
! strcmp (opcode,
"div") ||! strcmp (opcode, "imul") ||
! strcmp (opcode,
"xidiv") ||! strcmp (opcode, "andf") ||
! strcmp (opcode,
"xorf") ||! strcmp (opcode, "cmpge"))
{
testRegArg (arg2);
}
/* check addressField
*/
if (! strcmp (opcode,
"lw") ||! strcmp (opcode, "sw") ||
! strcmp (opcode,
"beq") ||! strcmp (opcode, "jmae") ||
! strcmp (opcode,
"jmnae") ||! strcmp (opcode, "jne"))
{
testAddrArg (arg2);
}
if (! strcmp (opcode,".
fill"))
{
testAddrArg (arg0);
}
/* check for enough
arguments */
if ( (strcmp (opcode,
"halt") && strcmp (opcode, "noop") &&
strcmp (opcode,".
fill") && strcmp (opcode, "jalr") &&
strcmp (opcode,
"bsf") && strcmp (opcode, "bsr") &&
strcmp (opcode,
"pop") && strcmp (opcode, "push") &&
strcmp (opcode,
"je") && arg2 [0] =='\0') ||
(! strcmp (opcode,
"jalr") && arg1 [0] =='\0') ||
(! strcmp (opcode,".
fill") && arg0 [0] =='\0'))
{
printf ("error
at address %d: not enough arguments\n", address);
exit (2);
}
if (label [0]! = '\0')
{
/* check for labels
that are too long */
if (strlen (label)
>= MAXLABELLENGTH) {
printf ("label
too long\n");
exit (2);
}
/* make sure label
starts with letter */
if (! sscanf (label,
"% [a-zA-Z]", argTmp)) {
printf ("label
doesn't start with letter\n");
exit (2);
}
/* make sure label
consists of only letters andf numbers */
sscanf (label,
"% [a-zA-Z0-9]", argTmp);
if (strcmp (argTmp,
label)) {
printf ("label
has character other than letters andf numbers\n");
exit (2);
}
/* look for duplicate
label */
for (i=0; i<numLabels;
i++) {
if (! strcmp (label,
labelArray [i])) {
printf ("error:
duplicate label %s at address %d\n",
label, address);
exit (1);
}
}
/* see if there are
too many labels */
if (numLabels >=
MAXNUMLABELS) {
printf ("error:
too many labels (label=%s) \n", label);
exit (2);
}
strcpy (labelArray
[numLabels], label);
labelAddress [numLabels++]
= address;
}
}
for (i=0; i<numLabels;
i++) {
/* printf ("%s
= %d\n", labelArray [i], labelAddress [i]); */
}
/* now do second pass
(print machine code, with symbols filled in as
addresses) */
rewind (inFilePtr);
for (address=0; readandfParse
(inFilePtr, label, opcode, arg0, arg1, arg2);
address++) {
if (! strcmp (opcode,
"add")) num = (ADD << else if (! strcmp
(opcode, "nand")) else if (! strcmp
(opcode, "div")) num = (div << else if (! strcmp
(opcode, "imul")) (atoi (arg1) << 16) else if (! strcmp
(opcode, "xidiv")) else if (! strcmp
(opcode, "andf")) else if (! strcmp
(opcode, "xorf")) else if (! strcmp
(opcode, "cmpge")) else if (! strcmp
(opcode, "jalr")) (atoi (arg1) << 16); else if (! strcmp
(opcode, "bsf")) else if (! strcmp
(opcode, "push")) {
num = (push <<
22);
} else if (! strcmp
(opcode, "pop")) {
num = (pop <<
22);
} else if (! strcmp
(opcode, "halt")) {
num = (HALT <<
22);
} else if (! strcmp
(opcode, "noop")) {
num = (NOOP <<
22);
} else if (! strcmp
(opcode, "bsr")) else if (! strcmp
(opcode, "lw") ||! strcmp (opcode, "sw") ||
! strcmp (opcode,
"beq") ||! strcmp (opcode, "jmae") ||
! strcmp (opcode,
"jmnae") ||! strcmp (opcode, "jne")) {
/* if arg2 is symbolic,
then translate into an address */
if (! isNumber (arg2))
{
addressField = translateSymbol
(labelArray, labelAddress,
numLabels, arg2);
/*
printf ("%s being
translated into %d\n", arg2, addressField);
*/
if (! strcmp (opcode,
"beq") ||! strcmp (opcode, "jmae") ||! strcmp (opcode,
"jmnae")) {
addressField = addressField-address-1;
}
} else {
addressField = atoi
(arg2);
}
if (addressField <
- 32768 || addressField > 32767) {
printf ("error:
offset %d out of range\n", addressField);
exit (1);
}
/* truncate the offset
field, in case it's negative */
addressField = addressField
& 0xFFFF;
if (! strcmp (opcode,
"beq")) addressField; else if (! strcmp
(opcode, "jmae")) else if (! strcmp
(opcode, "jmnae")) num = (jmnae << else if (! strcmp
(opcode, "jne")) else {
/* lw or sw */
if (! strcmp (opcode,
"lw")) (atoi (arg1) << else
}
} else if (! strcmp
(opcode,". fill")) {
if (! isNumber (arg0))
{
num = translateSymbol
(labelArray, labelAddress, numLabels,
arg0);
} else {
num = atoi (arg0);
}
}
/* printf ("
(address %d): %d (hex 0x%x) \n", address, num, num); */
fprintf (outFilePtr,
"%d\n", num);
}
exit (0);
}
/*
* Read andf parse a
line of the assembly-language file. Fields are returned
* in label, opcode,
arg0, arg1, arg2 (these strings must have memory already
* allocated to them).
*
* Return values:
* 0 if reached end
of file
* 1 if all went well
*
* exit (1) if line
is too long.
*/
int readandfParse
(FILE *inFilePtr, char *label, char *opcode, char *arg0,char *arg1, char *arg2)
{
char line [MAXLINELENGTH];
char *ptr = line;
/* delete prior values
*/
label [0] = opcode
[0] = arg0 [0] = arg1 [0] = arg2 [0] = '\0';
/* read the line from
the assembly-language file */
if (fgets (line, MAXLINELENGTH,
inFilePtr) == NULL) {
/* reached end of file
*/
return (0);
}
/* check for line too
long */
if (strlen (line) ==
MAXLINELENGTH-1) {
printf ("error:
line too long\n");
exit (1);
}
/* is there a label?
*/
ptr = line;
if (sscanf (ptr,
"% [^\t\n]", label)) {
/* successfully read
label; advance pointer over the label */
ptr += strlen (label);
}
/*
* Parse the rest of
the line. Would be nice to have real regular
* expressions, but
scanf will suffice.
*/
sscanf (ptr,
"%* [\t\n\r] % [^\t\n\r] %* [\t\n\r] % [^\t\n\r] %* [\t\n\r] % [^\t\n\r] %*
[\t\n\r] % [^\t\n\r] ",
opcode, arg0, arg1,
arg2);
return (1);
}
int translateSymbol
(char labelArray [MAXNUMLABELS] [MAXLABELLENGTH],
int labelAddress [MAXNUMLABELS],
int numLabels, char *symbol)
{
int i;
/* search through address
label table */
for (i=0; i<numLabels
&& strcmp (symbol, labelArray [i]); i++) {
}
if (i>=numLabels)
{
printf ("error:
missing label %s\n", symbol);
exit (1);
}
return (labelAddress
[i]);
}
int isNumber (char
*string)
{
/* return 1 if string
is a number */
int i;
return ( (sscanf (string,
"%d", &i)) == 1);
}
/* Test register argument;
make sure it's in range andf has no bad characters. */
void testRegArg (char
*arg)
{
int num;
char c;
if (atoi (arg) <
0 || atoi (arg) > 7) {
printf ("error:
register out of range\n");
exit (2);
}
if (sscanf (arg,
"%d%c", &num, &c)! = 1) {
printf ("bad character
in register argument\n");
exit (2);
}
}
/* Test addressField
argument. */
void testAddrArg (char
*arg)
{
int num;
char c;
/* test numeric addressField
*/
if (isNumber (arg))
{
if (sscanf (arg,
"%d%c", &num, &c)! = 1) {
printf ("bad character
in addressField\n");
exit (2);
}
}
}
Додаток II (код
симулятора)
/*Instruction-level
simulator for the LC */
#include <stdio.
h>
#include <stdlib.
h>
#include <string>
#include <math.
h>
#include <vector>
using namespace std;
#define NUMMEMORY 65536
/* maximum number of words in memory */
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