-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathexecute.java
More file actions
179 lines (160 loc) · 5.66 KB
/
Copy pathexecute.java
File metadata and controls
179 lines (160 loc) · 5.66 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
/*
* ARM Simulator
* Computer Organization Rroject
* Vishal Singh - 2016277
* Tanya Gupta - 2016107
* Shagun Uppal - 2016088
*
*/
package arm;
public class execute
{
public static void exec(ARMSim A)
{
if(A.exit!=true)
{
if(A.is_dataproc)
{
exec_dataproc(A); // execute method for data processing instruction
}
else if(A.is_branch && A.branch) // execute method for branch instruction
{
exec_branch(A);
}
else if(A.is_datatrans) // data processing for data transfer instruction
{
exec_datatrans(A);
}
}
return;
}
public static void exec_dataproc(ARMSim A)
{
// check for opcode calculated during decode and perform the required ALU as per the Operational Code of the instruction
if (A.opCode.equals("0"))
{
A.answer = Integer.toString( (Integer.parseInt(A.op1,2) & Integer.parseInt(A.op2,2)),2 );
System.out.println("EXECUTE : Operation is : AND");
System.out.println("EXECUTE : AND "+Integer.parseInt(A.op1,2)+" and "+Integer.parseInt(A.op2,2)+"\n");
}
else if (A.opCode.equals("1"))
{
A.answer = Integer.toString( Integer.parseInt(A.op1,2) ^ Integer.parseInt(A.op2,2) ,2);
System.out.println("EXECUTE : Operation is : EXCLUSIVE OR");
System.out.println("EXECUTE : EOR "+Integer.parseInt(A.op1,2)+" and "+Integer.parseInt(A.op2,2)+"\n");
}
else if(A.opCode.equals("2"))
{
A.answer = Integer.toString( Integer.parseInt(A.op1,2) - Integer.parseInt(A.op2,2),2 );
System.out.println("EXECUTE : Operation is : SUBTRACT");
System.out.println("EXECUTE : SUB "+Integer.parseInt(A.op1,2)+" and "+Integer.parseInt(A.op2,2)+"\n");
}
else if(A.opCode.equals("4"))
{
A.answer = Integer.toString( (Integer.parseInt(A.op1,2) + Integer.parseInt(A.op2,2) ),2);
System.out.println("EXECUTE : Operation is : ADDITION");
System.out.println("EXECUTE : ADD "+Integer.parseInt(A.op1,2)+" and "+Integer.parseInt(A.op2,2));
}
else if(A.opCode.equals("5"))
{
A.answer = Integer.toString( Integer.parseInt(A.op1,2) + Integer.parseInt(A.op2,2) + 1,2);
System.out.println("EXECUTE : Operation is : ADD WITH CARRY");
System.out.println("EXECUTE : ADC "+Integer.parseInt(A.op1,2)+" and "+Integer.parseInt(A.op2,2)+"\n");
}
else if(A.opCode.equals("6"))
{
A.answer = Integer.toString( Integer.parseInt(A.op1,2) - Integer.parseInt(A.op2,2) - 1,2);
System.out.println("EXECUTE : Operation is : SUBTRACT WITH CARRY");
System.out.println("EXECUTE : SBC "+Integer.parseInt(A.op1,2)+" and "+Integer.parseInt(A.op2,2)+"\n");
}
else if(A.opCode.equals("10"))
{
if(Integer.parseInt(A.op1,2)==Integer.parseInt(A.op2,2))
{
A.Z=true;
}
else
A.Z=false;
if(Integer.parseInt(A.op1,2)<Integer.parseInt(A.op2,2))
{
A.N=true;
}
else
A.N=false;
System.out.println("EXECUTE : Operation is : COMPARE");
System.out.println("EXECUTE : CMP "+Integer.parseInt(A.op1,2)+" and "+Integer.parseInt(A.op2,2)+"\n");
}
else if(A.opCode.equals("12"))
{
A.answer = Integer.toString( Integer.parseInt(A.op1,2) | Integer.parseInt(A.op2,2) ,2);
System.out.println("EXECUTE : Operation is : INCLUSIVE OR");
System.out.println("EXECUTE : ORR "+Integer.parseInt(A.op1,2)+" and "+Integer.parseInt(A.op2,2)+"\n");
}
else if(A.opCode.equals("13"))
{
A.answer = A.op2;
System.out.println("EXECUTE : Operation is : MOVE");
System.out.println("MOV "+Integer.parseInt(A.op2,2)+" TO R"+A.dest_reg);
}
else if(A.opCode.equals("15"))
{
A.answer = Integer.toString( ~ Integer.parseInt(A.op2,2),2);
System.out.println("EXECUTE : Operation is : NOT");
System.out.println("EXECUTE : NOT OF "+Integer.parseInt(A.op2,2)+"\n");
}
return;
}
public static void exec_branch(ARMSim A)
{
try
{
A.offset = A.instruction.substring(8,32);
A.sign = A.offset.substring(0,1); // sign bit : 1 for negative and 0 for positive
System.out.println("Sign="+A.sign);
if(A.sign.equals("1")) // for negative sign bit, convert the offset from 2's complement
{
A.offset = Long.toString( Long.parseLong(A.offset,2) | Long.parseLong("FF000000",16) ,2);
A.offset = Long.toString(Long.parseLong(A.offset,2)<<2,2);
A.offset = A.offset.substring(2,A.offset.length());
A.offset = Long.toString(Long.parseLong(A.offset,2)+8,2);
A.R[15]=Long.toString(Long.parseLong(A.R[15].substring(2,A.R[15].length()),16)+Long.parseLong(A.offset,2),2);
A.R[15]="0x"+Long.toString(Long.parseLong(A.R[15].substring(1,A.R[15].length()),2),16);
}
else
{
A.offset = Long.toString( Long.parseLong(A.offset,2) | Long.parseLong("00000000",16) ,2);
A.offset = Long.toString(Long.parseLong(A.offset,2)<<2,2);
A.offset = Long.toString(Long.parseLong(A.offset,2)+8,2);
A.R[15]=Long.toString(Long.parseLong(A.R[15].substring(2,A.R[15].length()),16)+Long.parseLong(A.offset,2),2);
A.R[15]="0x"+Long.toString(Long.parseLong(A.R[15].substring(0,A.R[15].length()),2),16);
}
System.out.println(A.R[15]);
return;
}
catch(Exception E)
{
E.printStackTrace();
}
}
public static void exec_datatrans(ARMSim A)
{
try
{
A.reg1 = Long.toString(( Long.parseLong(A.instruction,2) & Long.parseLong("000F0000",16)) >> 16,2) ; // register 1
A.dest_reg = Long.toString(( Long.parseLong(A.instruction,2) & Long.parseLong("0000F000",16)) >> 12,2); // destination register for load and data to be stored for store instruction
A.answer=A.R[Integer.parseInt(A.dest_reg,2)];
if(A.load)
{
System.out.println("LOAD ");
}
else if(A.store)
{
System.out.println("STORE ");
}
}catch(Exception E)
{
E.printStackTrace();
}
return;
}
}