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Implement aboslute addressing mode.

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This commit is contained in:
Radosław Kujawa 2017-01-23 00:00:45 +01:00
parent 5eede9333b
commit 87c424557e
1 changed files with 8 additions and 3 deletions
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11
src/instruction.c
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@ -183,12 +183,14 @@ instruction_data_write_1(rk65c02emu_t *e, instrdef_t *id, instruction_t *i, uint
iaddr |= (bus_read_1(e->bus, i->op1 + 1) << 8);
bus_write_1(e->bus, iaddr, val);
break;
case ABSOLUTE:
bus_write_1(e->bus, i->op1 + (i->op2 << 8), val);
break;
case ACCUMULATOR:
case IMMEDIATE:
case IZPX:
case IZPY:
case RELATIVE:
case ABSOLUTE:
case ABSOLUTEX:
case ABSOLUTEY:
case IABSOLUTE:
@ -235,20 +237,23 @@ instruction_data_read_1(rk65c02emu_t *e, instrdef_t *id, instruction_t *i)
/* ziaddr = bus_read_1(e->bus, i->op1 + e->regs.X);
ziaddr |= (bus_read_1(e->bus, i->op1 + e->regs.X + 1) << 8);
rv = bus_read_1(e->bus, ziaddr);
break;
*/
break;
case IZPY:
/*
iaddr = bus_read_1(e->bus, i->op1 + e->regs.Y);
iaddr |= (bus_read_1(e->bus, i->op1 + e->regs.Y + 1) << 8);
rv = bus_read_1(e->bus, ziaddr);
*/
case RELATIVE:
break;
case ABSOLUTE:
rv = bus_read_1(e->bus, i->op1 + (i->op2 << 8));
break;
case ABSOLUTEX:
case ABSOLUTEY:
case IABSOLUTE:
case IABSOLUTEX:
case RELATIVE:
default:
printf("unhandled addressing mode for opcode %x\n",
i->opcode);