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separate preprocessor directives into smaller libraries

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This commit is contained in:
Erick
2022-02-05 15:42:00 +01:00
parent 6ff478dba7
commit 231aa9c18a
3 changed files with 108 additions and 96 deletions
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src/includes.h
+32
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@@ -0,0 +1,32 @@
/*
TVM is a virtual machine for LC-3 based operating systems and it is used for educational purposes.
Copyright (c) under MIT license
Written by Erick Ahmed, 2022
*/
/* List of all the libraries needed to run tyvm.c */
//#define __UNIX // uncomment ONLY if compiling for unix-based operative system
/* universal libraries */
#include <stdint.h>
#include <stdio.h>
#include <signal.h>
/* unix only libraries */
#ifdef __UNIX
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
/* sys libraries */
#include <sys/time.h>
#include <sys/types.h>
#include <sys/termios.h>
#include <sys/mman.h>
/* windows only libraries */
#else
#include <Windows.h>
#include <conio.h>
#endif
src/registers.h
+69
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@@ -0,0 +1,69 @@
/*
TVM is a virtual machine for LC-3 based operating systems and it is used for educational purposes.
Copyright (c) under MIT license
Written by Erick Ahmed, 2022
*/
/* memory mapped register tables */
enum mmr {
MMR_KSR = 0xFE00, // keyboard status
MMR_KDR = 0xFE02 // keyboard data
};
/* Initializing 10 registers of which:
8 general purpose, 1 program counter, 1 conditional */
enum registers {
RG_000 = 0,
RG_001,
RG_010,
RG_011,
RG_100,
RG_101,
RG_110,
RG_111,
RG_PC, // program counter
RG_COND, // condition flag
RG_COUNT
};
/* Trap codes used for OP_TRAP */
enum trapcodes {
TRAP_GETC = 0x20, // get charcter from keyboard
TRAP_OUT = 0x21, // output a character
TRAP_PUTS = 0x22, // output a word string
TRAP_IN = 0x23, // get charcter from keyboard and echo to terminal
TRAP_PUTSP = 0x24, // output a byte string
TRAP_HALT = 0x25 // halt program
};
/* Initializing memory and register storages */
uint16_t memory[UINT16_MAX];
uint16_t reg[RG_COUNT];
/* Creating instruction set opcodes */
enum opcodes { // [name, 8-bit value]
OP_BR = 0, // branch, 0000
OP_ADD, // add, 0001
OP_LD, // load, 0010
OP_ST, // store, 0011
OP_JSR, // jump register, 0100
OP_AND, // bitwise and, 0101
OP_LDR, // load register, 0110
OP_STR, // store register, 0111
OP_RTI, // unused opcode
OP_NOT, // bitwise not, 1001
OP_LDI, // indirect load, 1010
OP_STI, // indirect store, 1011
OP_JMP, // jump, 1100
OP_RES, // reserved opcode,
OP_LEA, // load effective address, 1110
OP_TRAP, // execute trap, 1111
};
/* Creating condition flags */
enum flags {
FL_P = 1, // Positive
FL_Z = 1 << 1, // Zero
FL_N = 1 << 2, // Negative
};
src/tyvm.c
+7 -96
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@@ -4,33 +4,10 @@
Written by Erick Ahmed, 2022
*/
//#define __UNIX // uncomment ONLY if compiling on unix-based operative system
/* universal libraries */
#include <stdint.h>
#include <stdio.h>
#include <signal.h>
/* unix only libraries */
#ifdef __UNIX
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
/* sys libraries */
#include <sys/time.h>
#include <sys/types.h>
#include <sys/termios.h>
#include <sys/mman.h>
/* windows only libraries */
#else
#include <Windows.h>
#include <conio.h>
#endif
#include "includes.h"
#include "registers.h"
#ifndef __UNIX
/* windows only declaration */
HANDLE hStdin = INVALID_HANDLE_VALUE;
#endif
@@ -38,69 +15,6 @@
#define FALSE 0
/* memory mapped register tables */
enum mmr {
MMR_KSR = 0xFE00, // keyboard status
MMR_KDR = 0xFE02 // keyboard data
};
/* Initializing 10 registers of which:
8 general purpose, 1 program counter, 1 conditional */
enum registers {
RG_000 = 0,
RG_001,
RG_010,
RG_011,
RG_100,
RG_101,
RG_110,
RG_111,
RG_PC, // program counter
RG_COND, // condition flag
RG_COUNT
};
/* Trap codes used for OP_TRAP */
enum trapcodes {
TRAP_GETC = 0x20, // get charcter from keyboard
TRAP_OUT = 0x21, // output a character
TRAP_PUTS = 0x22, // output a word string
TRAP_IN = 0x23, // get charcter from keyboard and echo to terminal
TRAP_PUTSP = 0x24, // output a byte string
TRAP_HALT = 0x25 // halt program
};
/* Initializing memory and register storages */
uint16_t memory[UINT16_MAX];
uint16_t reg[RG_COUNT];
/* Creating instruction set opcodes */
enum opcodes { // [name, 8-bit value]
OP_BR = 0, // branch, 0000
OP_ADD, // add, 0001
OP_LD, // load, 0010
OP_ST, // store, 0011
OP_JSR, // jump register, 0100
OP_AND, // bitwise and, 0101
OP_LDR, // load register, 0110
OP_STR, // store register, 0111
OP_RTI, // unused opcode
OP_NOT, // bitwise not, 1001
OP_LDI, // indirect load, 1010
OP_STI, // indirect store, 1011
OP_JMP, // jump, 1100
OP_RES, // reserved opcode,
OP_LEA, // load effective address, 1110
OP_TRAP, // execute trap, 1111
};
/* Creating condition flags */
enum flags {
FL_P = 1, // Positive
FL_Z = 1 << 1, // Zero
FL_N = 1 << 2, // Negative
};
/* Sign extension function for immediate add mode (imm5[0:4])
transforms 5bit number to 8bit number preserving sign*/
uint16_t sign_extend(uint16_t n, int bit_count) {
@@ -215,14 +129,11 @@ int mem_read(uint16_t address) {
}
#endif
//#ifdef __UNIX
void handle_interrupt(int signal) {
restore_input_buffering();
printf("\n");
exit(-2);
}
//#endif
void handle_interrupt(int signal) {
restore_input_buffering();
printf("\n");
exit(-2);
}
int main(int argc, const char* argv[]) {