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This commit is contained in:
Radosław Kujawa 2018-04-10 12:49:11 +02:00
parent 901e9626d5
commit f0471947fc
1 changed files with 39 additions and 22 deletions
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61
src/rk65c02.h
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@ -6,39 +6,52 @@
#include "bus.h"
/**
* @brief Current state of the emulator.
*/
typedef enum {
STOPPED,
RUNNING,
STEPPING /* XXX: how to implement? */
STOPPED, /**< Stopped. */
RUNNING, /**< Running. */
STEPPING /**< Stepping. */
} emu_state_t;
/**
* @brief Enum describing why emulation stopped.
*/
typedef enum {
STP, /* due to 65C02 STP instruction */
WAI, /* waiting for interrupt */
BREAKPOINT, /* due to breakpoint set */
WATCHPOINT, /* due to watchpoint set */
STEPPED, /* stepped appropriate number of instructions */
HOST, /* due to host stop function called */
EMUERROR /* due to emulator error */
STP, /**< Due to 65C02 STP instruction. */
WAI, /**< Waiting for interrupt (WAI instruction). */
BREAKPOINT, /**< Due to breakpoint set. */
WATCHPOINT, /**< Due to watchpoint set (not implemented). */
STEPPED, /**< Stepped appropriate number of instructions. */
HOST, /**< Due to host stop function called. */
EMUERROR /**< Due to emulator error. */
} emu_stop_reason_t;
/**
* @brief Current state of emulated CPU registers.
*/
struct reg_state {
uint8_t A; /* accumulator */
uint8_t X; /* index X */
uint8_t Y; /* index Y */
uint8_t A; /**< Accumulator. */
uint8_t X; /**< Index X. */
uint8_t Y; /**< Index Y. */
uint16_t PC; /* program counter */
uint8_t SP; /* stack pointer */
uint8_t P; /* status */
uint16_t PC; /**< Program counter. */
uint8_t SP; /**< Stack pointer. */
uint8_t P; /**< Status. */
};
typedef struct reg_state reg_state_t;
#define P_CARRY 0x1
#define P_ZERO 0x2
/** Status register flag: IRQ disabled */
#define P_IRQ_DISABLE 0x4
/** Status register flag: BCD mode */
#define P_DECIMAL 0x8
/** Status register flag: BRK was the cause of interrupt */
#define P_BREAK 0x10
/** Status register flag: Undefined (always 1) */
#define P_UNDEFINED 0x20
#define P_SIGN_OVERFLOW 0x40
#define P_NEGATIVE 0x80
@ -64,17 +77,20 @@ typedef struct trace_t {
struct trace_t *prev,*next;
} trace_t;
/**
* @brief Instance of the emulator.
*/
struct rk65c02emu {
emu_state_t state;
bus_t *bus;
reg_state_t regs;
emu_stop_reason_t stopreason;
bool irq; /* interrupt request line state, true is asserted */
bool irq; /**< Interrupt request line state, true is asserted. */
breakpoint_t *bps_head; /* pointer to linked list with breakpoints */
bool runtime_disassembly; /* disassemble code when emulator is running */
bool trace; /* tracing mode enable/disable */
trace_t *trace_head; /* pointer to linked list with trace log */
breakpoint_t *bps_head; /**< Pointer to linked list with breakpoints. */
bool runtime_disassembly; /**< Disassemble code when emulator is running. */
bool trace; /**< Tracing mode enable/disable. */
trace_t *trace_head; /**< Pointer to linked list with trace log. */
};
typedef struct rk65c02emu rk65c02emu_t;
@ -93,11 +109,12 @@ void rk65c02_start(rk65c02emu_t *);
* @brief Execute as many instructions as specified in steps argument.
*/
void rk65c02_step(rk65c02emu_t *, uint16_t);
char *rk65c02_regs_string_get(reg_state_t);
void rk65c02_dump_regs(reg_state_t);
void rk65c02_dump_stack(rk65c02emu_t *, uint8_t);
/*
/**
* @brief Assert the IRQ line.
*/
void rk65c02_assert_irq(rk65c02emu_t *);