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add sti (store indirect) register

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Erick
2022-02-04 02:26:28 +01:00
parent 9a24c91c07
commit 83b3adbcdc
1 changed files with 8 additions and 2 deletions
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tyvm.c
+8 -2
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@@ -63,7 +63,7 @@ enum opcodes { // [name, value]
OP_RTI, // unused opcode
OP_NOT, // bitwise not, 1001
OP_LDI, // indirect load, 1010
OP_STI, // indirect store,
OP_STI, // indirect store, 1011
OP_JMP, // jump, 1100
OP_RES, // reserved opcode,
OP_LEA, // load effective address,
@@ -204,7 +204,13 @@ int main(int argc, const char* argv[]) {
break;
case OP_STI:
//{STI};
uint16_t sr = (instr >> 6) & 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[sr] = mem_read(mem_read(PCoffset9 + reg[RG_PC]));
update_flags(dr);
break;
case OP_JMP:
uint16_t BaseR = (instr >> 6) & 0x7;