eeeck/tyvm
Archived
1
0
Fork 0
Code Activity

bugfix and renaming variables

Browse Source
This commit is contained in:
Erick
2022-02-06 21:51:37 +01:00
parent 698ada4fb7
commit cface4669c
2 changed files with 60 additions and 60 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/registers.h
+30 -30
View File
@@ -9,14 +9,14 @@ enum mmr {
/* Initializing 10 registers of which: /* Initializing 10 registers of which:
8 general purpose, 1 program counter, 1 conditional */ 8 general purpose, 1 program counter, 1 conditional */
enum registers { enum registers {
RG_000 = 0, R0 = 0,
RG_001, R1,
RG_010, R2,
RG_011, R3,
RG_100, R4,
RG_101, R5,
RG_110, R6,
RG_111, R7,
RG_PC, // program counter RG_PC, // program counter
RG_COND, // condition flag RG_COND, // condition flag
RG_COUNT RG_COUNT
@@ -24,32 +24,32 @@ enum registers {
/* Creating instruction set opcodes */ /* Creating instruction set opcodes */
enum opcodes { // [name, 8-bit value] enum opcodes { // [name, 8-bit value]
OP_BR = 0, // branch, 0000 BR = 0, // branch, 0000
OP_ADD, // add, 0001 ADD, // add, 0001
OP_LD, // load, 0010 LD, // load, 0010
OP_ST, // store, 0011 ST, // store, 0011
OP_JSR, // jump register, 0100 JSR, // jump register, 0100
OP_AND, // bitwise and, 0101 AND, // bitwise and, 0101
OP_LDR, // load register, 0110 LDR, // load register, 0110
OP_STR, // store register, 0111 STR, // store register, 0111
OP_RTI, // unused opcode RTI, // unused opcode
OP_NOT, // bitwise not, 1001 NOT, // bitwise not, 1001
OP_LDI, // indirect load, 1010 LDI, // indirect load, 1010
OP_STI, // indirect store, 1011 STI, // indirect store, 1011
OP_JMP, // jump, 1100 JMP, // jump, 1100
OP_RES, // reserved opcode, RES, // reserved opcode,
OP_LEA, // load effective address, 1110 LEA, // load effective address, 1110
OP_TRAP, // execute trap, 1111 TRAP, // execute trap, 1111
}; };
/* Trap codes used for OP_TRAP */ /* Trap codes used for OP_TRAP */
enum trapcodes { enum trapcodes {
TRAP_GETC = 0x20, // get charcter from keyboard GETC = 0x20, // get charcter from keyboard
TRAP_OUT = 0x21, // output a character OUTP = 0x21, // output a character
TRAP_PUTS = 0x22, // output a word string PUTS = 0x22, // output a word string
TRAP_IN = 0x23, // get charcter from keyboard and echo to terminal INP = 0x23, // get charcter from keyboard and echo to terminal
TRAP_PUTSP = 0x24, // output a byte string PUTSP = 0x24, // output a byte string
TRAP_HALT = 0x25 // halt program HALT = 0x25 // halt program
}; };
/* Creating condition flags */ /* Creating condition flags */
src/tyvm.c
+30 -30
View File
@@ -1,10 +1,10 @@
/* /*
TYVM is a virtual machine based on LC-3 architecture for educational purposes. TYVM is a virtual machine based on LC-3 architecture for educational purposes.
Copyright (c) 2022 Erick Ahmed Copyright (c) 2022 Erick Ahmed
Open-source software distributed under MIT license Open-source software distributed under GNU GPL v.3 license
*/ */
//#define __UNIX // used to modify code whether compiling on a Unix-based OS or a Windows machine #define __UNIX // used to modify code whether compiling on a Unix-based OS or a Windows machine
#include "includes.h" #include "includes.h"
#include "registers.h" #include "registers.h"
@@ -190,14 +190,14 @@ int main(int argc, const char* argv[]) {
uint16_t* ch; uint16_t* ch;
switch (op) { switch (op) {
case OP_BR: case BR:
cond = (instr >> 9) & 0x7; cond = (instr >> 9) & 0x7;
PCoffset9 = sign_extend(instr & 0x1FF, 9); PCoffset9 = sign_extend(instr & 0x1FF, 9);
if(cond & reg[RG_COND]) reg[RG_PC] += PCoffset9; if(cond & reg[RG_COND]) reg[RG_PC] += PCoffset9;
break; break;
case OP_ADD: case ADD:
dr = (instr >> 9) & 0x7; dr = (instr >> 9) & 0x7;
sr1 = (instr >> 6) & 0x7; sr1 = (instr >> 6) & 0x7;
imm_flag = (instr >> 5) & 0x1; imm_flag = (instr >> 5) & 0x1;
@@ -213,7 +213,7 @@ int main(int argc, const char* argv[]) {
update_flags(dr); update_flags(dr);
break; break;
case OP_LD: case LD:
dr = (instr >> 9) & 0x7; dr = (instr >> 9) & 0x7;
PCoffset9 = sign_extend(instr & 0x1FF, 9); PCoffset9 = sign_extend(instr & 0x1FF, 9);
@@ -222,7 +222,7 @@ int main(int argc, const char* argv[]) {
update_flags(dr); update_flags(dr);
break; break;
case OP_ST: case ST:
sr = (instr >> 6) & 0x7; sr = (instr >> 6) & 0x7;
PCoffset9 = sign_extend(instr & 0x1FF, 9); // 9-bit value that indicates where to load the address when added to RG_PC PCoffset9 = sign_extend(instr & 0x1FF, 9); // 9-bit value that indicates where to load the address when added to RG_PC
@@ -231,7 +231,7 @@ int main(int argc, const char* argv[]) {
update_flags(dr); update_flags(dr);
break; break;
case OP_JSR: case JSR:
PCoffset11 = sign_extend(instr & 0x1FF, 11); PCoffset11 = sign_extend(instr & 0x1FF, 11);
jsr_flag = (instr >> 11) & 0x1; jsr_flag = (instr >> 11) & 0x1;
BaseR_jsrr = (instr >> 6) & 0x7; // JSRR only ecoding BaseR_jsrr = (instr >> 6) & 0x7; // JSRR only ecoding
@@ -240,7 +240,7 @@ int main(int argc, const char* argv[]) {
else reg[RG_PC] += PCoffset11; // JSR else reg[RG_PC] += PCoffset11; // JSR
break; break;
case OP_AND: case AND:
dr = (instr >> 9) & 0x7; dr = (instr >> 9) & 0x7;
sr1 = (instr >> 6) & 0x7; sr1 = (instr >> 6) & 0x7;
imm_flag = (instr >> 5) & 0x1; imm_flag = (instr >> 5) & 0x1;
@@ -256,7 +256,7 @@ int main(int argc, const char* argv[]) {
update_flags(dr); update_flags(dr);
break; break;
case OP_LDR: case LDR:
dr = (instr >> 9) & 0x7; dr = (instr >> 9) & 0x7;
BaseR = (instr >> 6) & 0x7; BaseR = (instr >> 6) & 0x7;
offset6 = sign_extend(instr & 0x3FF, 6); offset6 = sign_extend(instr & 0x3FF, 6);
@@ -266,7 +266,7 @@ int main(int argc, const char* argv[]) {
update_flags(dr); update_flags(dr);
break; break;
case OP_STR: case STR:
sr = (instr >> 6) & 0x7; sr = (instr >> 6) & 0x7;
BaseR = (instr >> 6) & 0x7; BaseR = (instr >> 6) & 0x7;
offset6 = sign_extend(instr & 0x1FF, 6); offset6 = sign_extend(instr & 0x1FF, 6);
@@ -276,7 +276,7 @@ int main(int argc, const char* argv[]) {
update_flags(dr); update_flags(dr);
break; break;
case OP_NOT: case NOT:
dr = (instr >> 9) & 0x7; // destination register dr = (instr >> 9) & 0x7; // destination register
sr = (instr >> 6) & 0x7; // source register sr = (instr >> 6) & 0x7; // source register
@@ -285,7 +285,7 @@ int main(int argc, const char* argv[]) {
update_flags(dr); update_flags(dr);
break; break;
case OP_LDI: case LDI:
dr = (instr >> 9) & 0x7; dr = (instr >> 9) & 0x7;
PCoffset9 = sign_extend(instr & 0x1FF, 9); PCoffset9 = sign_extend(instr & 0x1FF, 9);
@@ -294,7 +294,7 @@ int main(int argc, const char* argv[]) {
update_flags(dr); update_flags(dr);
break; break;
case OP_STI: case STI:
sr = (instr >> 6) & 0x7; sr = (instr >> 6) & 0x7;
PCoffset9 = sign_extend(instr & 0x1FF, 9); // 9-bit value that indicates where to load the address when added to RG_PC PCoffset9 = sign_extend(instr & 0x1FF, 9); // 9-bit value that indicates where to load the address when added to RG_PC
@@ -303,7 +303,7 @@ int main(int argc, const char* argv[]) {
update_flags(dr); update_flags(dr);
break; break;
case OP_JMP: case JMP:
BaseR = (instr >> 6) & 0x7; BaseR = (instr >> 6) & 0x7;
reg[RG_PC] = reg[BaseR]; reg[RG_PC] = reg[BaseR];
@@ -311,7 +311,7 @@ int main(int argc, const char* argv[]) {
update_flags(dr); update_flags(dr);
break; break;
case OP_LEA: case LEA:
dr = (instr >> 9) & 0x7; dr = (instr >> 9) & 0x7;
PCoffset9 = sign_extend(instr & 0x1FF, 9); PCoffset9 = sign_extend(instr & 0x1FF, 9);
@@ -320,17 +320,17 @@ int main(int argc, const char* argv[]) {
update_flags(dr); update_flags(dr);
break; break;
case OP_TRAP: case TRAP:
switch(instr & 0xFF) { switch(instr & 0xFF) {
case TRAP_GETC: case GETC:
reg[RG_000] = (uint16_t)getchar(); reg[R0] = (uint16_t)getchar();
break; break;
case TRAP_OUT: case OUTP:
putc((char)reg[RG_000], stdout); putc((char)reg[R0], stdout);
fflush(stdout); fflush(stdout);
break; break;
case TRAP_PUTS: case PUTS:
stringPnt = memory + reg[RG_000]; stringPnt = memory + reg[R0];
while (*c) { while (*c) {
putc((char)*c, stdout); putc((char)*c, stdout);
@@ -339,18 +339,18 @@ int main(int argc, const char* argv[]) {
fflush(stdout); fflush(stdout);
break; break;
case TRAP_IN: case INP:
printf("Enter a character: "); printf("Enter a character: ");
char c = getchar(); char c = getchar();
putc(c, stdout); putc(c, stdout);
fflush(stdout); fflush(stdout);
reg[RG_000] = (uint16_t)c; reg[R0] = (uint16_t)c;
update_flags(RG_000); update_flags(R0);
break; break;
case TRAP_PUTSP: case PUTSP:
ch = memory + reg[RG_000]; ch = memory + reg[R0];
while (*ch) { while (*ch) {
char char1 = (*ch) & 0xFF; char char1 = (*ch) & 0xFF;
putc(char1, stdout); putc(char1, stdout);
@@ -361,7 +361,7 @@ int main(int argc, const char* argv[]) {
fflush(stdout); fflush(stdout);
break; break;
case TRAP_HALT: case HALT:
puts("HALT"); puts("HALT");
fflush(stdout); fflush(stdout);
running = FALSE; running = FALSE;
@@ -372,8 +372,8 @@ int main(int argc, const char* argv[]) {
break; break;
} }
break; break;
case OP_RES: // reserved case RES: // reserved
case OP_RTI: // unused case RTI: // unused
default: default:
abort(); abort();
break; break;