eeeck/tyvm
Archived
1
0
Fork 0
Code Activity

Update tyvm.c

Browse Source
This commit is contained in:
Erick
2022-02-01 00:18:06 +01:00
parent 130858d16a
commit 870ded4970
1 changed files with 30 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tyvm.c
+30 -19
View File
@@ -14,7 +14,7 @@
#include <signal.h>
/* unix only libraries */
// TODO: solve include errors
// FIXME: solve include errors
#ifdef __UNIX
#include <unistd.h>
#include <fcntl.h>
@@ -29,7 +29,7 @@
#define TRUE 1
#define FALSE 0
/* These are temporary, just to not get a lot of error while writing code */
/* TODO: remember to cancel defines after writing all functions */
#define BR
#define ADD
#define LD
@@ -47,6 +47,7 @@
#define LEA
#define TRAP
#define BAD_OPCODE
//define handle_interrupt()
/* Initializing 10 registers of which:
8 general purpose, 1 program counter, 1 conditional */
@@ -70,22 +71,22 @@ uint16_t reg[RG_COUNT];
/* Creating instruction set opcodes */
enum opcodes {
OP_BR = 0, // branch
OP_ADD, // add
OP_LD, // load
OP_ST, // store
OP_JSR, // jump register
OP_AND, // bitwise add
OP_LDR, // load register
OP_STR, // store register
OP_BR = 0, // branch, 0001
OP_ADD, // add, 0010
OP_LD, // load, 0011
OP_ST, // store, 0100
OP_JSR, // jump register, 0101
OP_AND, // bitwise add, 0110
OP_LDR, // load register, 0111
OP_STR, // store register, 1000
OP_RTI, // unused opcode
OP_NOT, // bitwise not
OP_LDI, // indirect load
OP_STI, // indirect store
OP_JMP, // jump
OP_RES, // reserved opcode
OP_LEA, // load effective address
OP_TRAP, // execute trap
OP_NOT, // bitwise not, 1001
OP_LDI, // indirect load, 1010
OP_STI, // indirect store, 1011
OP_JMP, // jump, 1100
OP_RES, // reserved opcode, 1101
OP_LEA, // load effective address, 1110
OP_TRAP, // execute trap, 1111
};
/* Creating condition flags */
@@ -95,7 +96,17 @@ enum flags {
FL_N = 1 << 2, // Negative
};
/* sign extension for immediate add mode (imm5[0:4])
transforms 5bit number to 8bit number preserving sign*/
uint16_t sign_extend(uint16_t bin, int bit_count) {
if((bin >> (bit_count - 1)) & 1) {
bin |= (0xFFFF << bit_count);
}
return bin;
}
/* main loop */
int main(int argc, const char* argv[]) {
if(argc < 2) {
@@ -108,7 +119,7 @@ int main(int argc, const char* argv[]) {
exit(1);
}
signal(SIGINT, handle_interrupt);
signal(SIGINT, handle_interrupt()); //FIXME: handle_interrupt may not be correct, gives an error without semicolons (should be without)
disable_input_buffering();
reg[RG_COND] = FL_Z;
@@ -172,5 +183,5 @@ int main(int argc, const char* argv[]) {
break;
}
}
restore_input_buffering(); // if shutdown then restore terminal settings
restore_input_buffering(); // if shutdown then restore terminal settings
}