4 * Ullrich von Bassewitz, 08.08.1998
7 * This is the interface to the cc65 debugger. Since many of the functions
8 * used for the debugger are quite usable even in another context, they
11 * To use the debugger, just call DbgStart in your application. This will
12 * clear the screen and startup the debugger with the program counter
13 * pointing to the next instruction after the call to DbgStart. Once DbgStart
14 * has been executed, the debugger will also catch any BRK opcode. Use the
15 * BREAK function declared below to insert additional breakpoints into your
18 * There are currently a lot of things that cannot be debugged, graphical
19 * applications are an example. The debugger does not save your screen
20 * contents, so even your text screen gets destroyed. However, you can
21 * debug the C and runtime library, even if the debugger is using this
24 * Note: When using the debugger, there are some other identifiers with
25 * external linkage, that start with Dbg. Avoid those names if you use the
36 /*****************************************************************************/
37 /* Utuility functions */
38 /*****************************************************************************/
42 unsigned __fastcall__ DbgDisAsm (unsigned Addr, char* Buf, unsigned char Len);
43 /* Disassemble one instruction at address addr into the given buffer.
44 * The resulting line has the format, "AAAA__BB_BB_BB___OPC_OPERAND",
45 * where AAAA is the hexadecimal representation of addr, BB are the
46 * bytes (in hex) that make the instruction, OPC is the mnemonic, and
47 * OPERAND is an operand for the instruction.
48 * The buffer is filled with spaces up to the given length and terminated as
49 * a usual C string. NOTE: Buf must be able to hold Len+1 characters.
50 * The function returns the length of the disassembled instruction, so,
51 * to disassemble the next instruction, add the return value to addr
52 * and call the function again.
55 unsigned __fastcall__ DbgDisAsmLen (unsigned Addr);
56 /* Disassemble one instruction, but do only return the length, do not
57 * create a visible representation. This function is useful when
58 * disassembling backwards, it is much faster than DbgDisAsm.
61 int __fastcall__ DbgIsRAM (unsigned Addr);
62 /* Return true if we can read and write the given address */
64 char* DbgMemDump (unsigned Addr, char* Buf, unsigned char Len);
65 /* Create a line of a memory dump in the given buffer. The buffer contains
66 * the starting address (4 digits hex), then Len bytes in this format:
67 * "AAAA__XX_YY_ZZ_...". The passed char buffer must hold Len*3+5 bytes
68 * plus a terminator byte.
69 * The function does not work correctly if the created string is longer
71 * The return value is Buf.
76 /*****************************************************************************/
77 /* High level user interface */
78 /*****************************************************************************/
82 void __fastcall__ DbgInit (unsigned unused);
83 /* Initialize the debugger. Use 0 as parameter. The debugger will popup on
84 * next brk encountered.
87 #define BREAK() __asm__ ("\tbrk")
88 /* Use this to insert breakpoints into your code */