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Move reg_state struct to header, rename op to opcode.
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0da3d6dc5f
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@ -11,18 +11,6 @@
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static bool run = false;
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struct reg_state {
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uint8_t A; /* accumulator */
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uint8_t X; /* index X */
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uint8_t Y; /* index Y */
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uint16_t PC; /* program counter */
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uint8_t SP; /* stack pointer */
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uint8_t P; /* status */
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};
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typedef struct reg_state reg_state_t;
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instruction_t
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instruction_fetch(bus_t *b, uint16_t addr)
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{
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@ -31,7 +19,7 @@ instruction_fetch(bus_t *b, uint16_t addr)
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i.opcode = bus_read_1(b, addr);
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i.def = instrs[i.opcode];
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assert(i.def.op != OP_UNIMPL);
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assert(i.def.opcode != OP_UNIMPL);
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/* handle operands */
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switch (i.def.mode) {
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@ -18,8 +18,20 @@ typedef enum {
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IABSOLUTEX
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} addressing_t;
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struct reg_state {
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uint8_t A; /* accumulator */
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uint8_t X; /* index X */
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uint8_t Y; /* index Y */
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uint16_t PC; /* program counter */
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uint8_t SP; /* stack pointer */
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uint8_t P; /* status */
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};
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typedef struct reg_state reg_state_t;
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struct instrdef {
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uint8_t op;
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uint8_t opcode;
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const char *mnemonic;
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addressing_t mode;
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uint8_t size;
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@ -36,7 +48,6 @@ struct instruction {
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typedef struct instruction instruction_t;
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#define OP_BRK 0x00
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#define OP_TSB_ZP 0x04
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#define OP_JSR 0x20
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