initial support for a display module, incomplete

[dcpu16] / dcpu16.h

diff --git a/dcpu16.h b/dcpu16.h
index edfccdfb53be7edbb1f0b41c7129c8fa0a736c11..73592d9c358e907b1c8d1b7d62e17162ebd6045b 100644 (file)
--- a/dcpu16.h
+++ b/dcpu16.h
@@ -1,6 +1,8 @@
 #ifndef DCPU16_H_3XXIQQG2
 #define DCPU16_H_3XXIQQG2
 
+#include <stdlib.h>
+
 /* the target system's concept of a word */
 typedef unsigned short DCPU16_WORD;
 
@@ -9,14 +11,29 @@ typedef unsigned short DCPU16_WORD;
 
 /* a self-contained dcpu16 core */
 struct dcpu16 {
-    unsigned long long cycle;   /* number of cycles this core has executed */
-    DCPU16_WORD reg[8];         /* system registers, a b c x y z i j */
-    DCPU16_WORD pc;             /* program counter */
-    DCPU16_WORD sp;             /* stack pointer */
-    DCPU16_WORD o;              /* overflow */
-    unsigned int skip_ : 1;     /* skip execution of next instruction */
-    DCPU16_WORD ram[DCPU16_RAM];  /* memory */
-    DCPU16_WORD reg_work_[2];   /* (private) work registers for holding literal values while decoding instructions */
+    unsigned long long cycle;           /* number of cycles this core has executed */
+    DCPU16_WORD reg[8];                 /* system registers, a b c x y z i j */
+    DCPU16_WORD pc;                     /* program counter */
+    DCPU16_WORD sp;                     /* stack pointer */
+    DCPU16_WORD o;                      /* overflow */
+    unsigned int skip_ : 1;             /* skip execution of next instruction */
+    DCPU16_WORD ram[DCPU16_RAM];        /* memory */
+    DCPU16_WORD reg_work_[2];           /* (private) work registers for holding literal values while decoding instructions */
+    struct dcpu16_acct_cb *cb_table_;   /* list of callbacks to invoke for certain events */
+    size_t cb_table_entries_;           /* callback list maintenance */
+    size_t cb_table_allocated_;         /* callback list maintenance */
+};
+
+/* these are used for accounting/watchpointing/&c */
+typedef unsigned int dcpu16_acct_event;
+#define DCPU16_ACCT_EV_READ     (1<<1)
+#define DCPU16_ACCT_EV_WRITE    (1<<2)
+#define DCPU16_ACCT_EV_NOP      (1<<3)
+#define DCPU16_ACCT_EV_RESET    (1<<4)
+struct dcpu16_acct_cb {
+    void (*fn)(struct dcpu16 *, dcpu16_acct_event e, DCPU16_WORD addr, void *);
+    void *data;
+    dcpu16_acct_event mask;
 };
 
 /* instantiate a new core */
@@ -31,9 +48,11 @@ void dcpu16_state_print(struct dcpu16 *);
 /* print the contents of ram from second to third argument */
 void dcpu16_dump_ram(struct dcpu16 *, DCPU16_WORD, DCPU16_WORD);
 
-/* print the instruction at the specified address */
-void dcpu16_disassemble_print(struct dcpu16 *, DCPU16_WORD);
+/* print the instruction at the specified address, returns number of words consumed in decoding */
+DCPU16_WORD dcpu16_disassemble_print(struct dcpu16 *, DCPU16_WORD);
 
+/* register a callback for an accounting event */
+int dcpu16_acct_add(struct dcpu16 *, dcpu16_acct_event mask, void (*fn)(struct dcpu16 *, dcpu16_acct_event, DCPU16_WORD, void *), void *data);
 
 /* execute the next instruction */
 void dcpu16_step(struct dcpu16 *);