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add ldr register (load register)

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Erick
2022-02-04 12:18:47 +01:00
parent bfbd03485a
commit 877b27a224
1 changed files with 9 additions and 2 deletions
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tyvm.c
+9 -2
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@@ -58,7 +58,7 @@ enum opcodes { // [name, value]
OP_ST, // store, 0011 OP_ST, // store, 0011
OP_JSR, // jump register, 0100 OP_JSR, // jump register, 0100
OP_AND, // bitwise and, 0101 OP_AND, // bitwise and, 0101
OP_LDR, // load register, OP_LDR, // load register, 0110
OP_STR, // store register, 0111 OP_STR, // store register, 0111
OP_RTI, // unused opcode OP_RTI, // unused opcode
OP_NOT, // bitwise not, 1001 OP_NOT, // bitwise not, 1001
@@ -190,7 +190,14 @@ int main(int argc, const char* argv[]) {
break; break;
case OP_LDR: case OP_LDR:
//{LDR}; uint16_t dr = (instr >> 9) & 0x7;
uint16_t BaseR = (instr >> 6) & 0x7;
uint16_t offset6 = sign_extend(instr & 0x3FF, 6);
reg[dr] = mem_read(reg[BaseR] + offset6);
update_flags(dr);
break; break;
case OP_STR: case OP_STR:
uint16_t sr = (instr >> 6) & 0x7; uint16_t sr = (instr >> 6) & 0x7;