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add and register (bitwise and)

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This commit is contained in:
Erick
2022-02-03 01:37:53 +01:00
parent 9c118e36c4
commit 9779be049f
1 changed files with 19 additions and 4 deletions
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tyvm.c
+19 -4
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@@ -76,7 +76,7 @@ enum opcodes { // [description, opcode value]
OP_LD, // load,
OP_ST, // store,
OP_JSR, // jump register,
OP_AND, // bitwise add,
OP_AND, // bitwise and,
OP_LDR, // load register,
OP_STR, // store register,
OP_RTI, // unused opcode
@@ -169,7 +169,22 @@ int main(int argc, const char* argv[]) {
{JSR};
break;
case OP_AND:
{AND};
uint16_t dr = (instr >> 9) & 0x7;
uint16_t sr1 = (instr >> 6) & 0x7;
uint16_t sr2;
uint16_t imm_flag = (instr >> 5) & 0x1;
uint16_t imm5;
if(imm_flag == 0) {
sr2 = (instr & 0x7);
reg[dr] = reg[sr1] & sr2; // register mode and
} else {
imm5 = sign_extend(instr & 0x1F, 5);
reg[dr] = reg[sr1] & imm5; // immediate mode and
}
update_flags(dr);
break;
case OP_LDR:
{LDR};
@@ -182,8 +197,8 @@ int main(int argc, const char* argv[]) {
break;
case OP_LDI:
uint16_t mdr; // memory data register
uint16_t dr = (instr >> 9) & 0x7; // 9-bit value that indicates where to load the address when added to RG_PC
uint16_t PCoffset9 = sign_extend(instr & 0x1FF, 9);
uint16_t dr = (instr >> 9) & 0x7;
uint16_t PCoffset9 = sign_extend(instr & 0x1FF, 9); // 9-bit value that indicates where to load the address when added to RG_PC
reg[mdr] = mem_read(PCoffset9 + reg[RG_PC]++);
reg[dr] = mem_read(reg[mdr]);