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   1 #ifndef DCPU16_H_3XXIQQG2
   2 #define DCPU16_H_3XXIQQG2
   3
   4 /* the target system's concept of a word */
   5 typedef unsigned short DCPU16_WORD;
   6
   7 /* how much ram the system has */
   8 #define DCPU16_RAM 0x10000
   9
  10 /* a self-contained dcpu16 core */
  11 struct dcpu16 {
  12     unsigned long long cycle;           /* number of cycles this core has executed */
  13     DCPU16_WORD reg[8];                 /* system registers, a b c x y z i j */
  14     DCPU16_WORD pc;                     /* program counter */
  15     DCPU16_WORD sp;                     /* stack pointer */
  16     DCPU16_WORD o;                      /* overflow */
  17     unsigned int skip_ : 1;             /* skip execution of next instruction */
  18     DCPU16_WORD ram[DCPU16_RAM];        /* memory */
  19     DCPU16_WORD reg_work_[2];           /* (private) work registers for holding literal values while decoding instructions */
  20     struct dcpu16_acct_cb *cb_table_;   /* list of callbacks to invoke under certain conditions */
  21     size_t cb_table_entries_;           /* callback list maintenance */
  22     size_t cb_table_allocated_;         /* callback list maintenance */
  23 };
  24
  25 /* these are used for accounting/watchpointing/&c */
  26 typedef unsigned int dcpu16_acct_event_;
  27 #define DCPU16_ACCT_EV_READ     (1<<1)
  28 #define DCPU16_ACCT_EV_WRITE    (1<<2)
  29 #define DCPU16_ACCT_EV_NOP      (1<<3)
  30 struct dcpu16_acct_cb {
  31     void (*fn)(struct dcpu16 *, dcpu16_acct_event_ e, DCPU16_WORD addr);
  32     dcpu16_acct_event_ mask;
  33 };
  34
  35 /* instantiate a new core */
  36 struct dcpu16 *dcpu16_new(void);
  37
  38 /* reset a core to initial state */
  39 void dcpu16_reset(struct dcpu16 *);
  40
  41 /* print the current state of a core */
  42 void dcpu16_state_print(struct dcpu16 *);
  43
  44 /* print the contents of ram from second to third argument */
  45 void dcpu16_dump_ram(struct dcpu16 *, DCPU16_WORD, DCPU16_WORD);
  46
  47 /* print the instruction at the specified address, returns number of words consumed in decoding */
  48 DCPU16_WORD dcpu16_disassemble_print(struct dcpu16 *, DCPU16_WORD);
  49
  50 /* register a callback for an accounting event */
  51 int dcpu16_acct_add(struct dcpu16 *, dcpu16_acct_event_ mask, void (*fn)(struct dcpu16 *, dcpu16_acct_event_, DCPU16_WORD));
  52
  53 /* execute the next instruction */
  54 void dcpu16_step(struct dcpu16 *);
  55
  56 /* release a core */
  57 void dcpu16_delete(struct dcpu16 **);
  58
  59 /* register callbacks to handle warning and debug messages, default is writing to stderr, may be set to null */
  60 void dcpu16_warn_cb_set(void (*)(char *, ...));
  61 void dcpu16_trace_cb_set(void (*)(char *, ...));
  62
  63 #endif /* DCPU16_H_3XXIQQG2 */