eeeck/tyvm
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add store register

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This commit is contained in:
Erick
2022-02-04 02:23:43 +01:00
parent 298fe805c0
commit 9a24c91c07
1 changed files with 9 additions and 3 deletions
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tyvm.c
+9 -3
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@@ -55,7 +55,7 @@ enum opcodes { // [name, value]
OP_BR = 0, // branch, OP_BR = 0, // branch,
OP_ADD, // add, 0001 OP_ADD, // add, 0001
OP_LD, // load, 0010 OP_LD, // load, 0010
OP_ST, // store, OP_ST, // store, 0011
OP_JSR, // jump register, OP_JSR, // jump register,
OP_AND, // bitwise and, 0101 OP_AND, // bitwise and, 0101
OP_LDR, // load register, OP_LDR, // load register,
@@ -150,7 +150,13 @@ int main(int argc, const char* argv[]) {
break; break;
case OP_ST: case OP_ST:
//{ST} 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(PCoffset9 + reg[RG_PC]);
update_flags(dr);
break; break;
case OP_JSR: case OP_JSR:
//{JSR}; //{JSR};
@@ -190,7 +196,7 @@ int main(int argc, const char* argv[]) {
break; break;
case OP_LDI: case OP_LDI:
uint16_t dr = (instr >> 9) & 0x7; 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 uint16_t PCoffset9 = sign_extend(instr & 0x1FF, 9);
reg[dr] = mem_read(mem_read(PCoffset9 + reg[RG_PC])); reg[dr] = mem_read(mem_read(PCoffset9 + reg[RG_PC]));