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include/dbg.h

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+/*
+ * dbg.h
+ *
+ * Ullrich von Bassewitz, 08.08.1998
+ *
+ *
+ * This is the interface to the cc65 debugger. Since many of the functions
+ * used for the debugger are quite usable even in another context, they
+ * are declared here.
+ *
+ * To use the debugger, just call DbgStart in your application. This will
+ * clear the screen and startup the debugger with the program counter
+ * pointing to the next instruction after the call to DbgStart. Once DbgStart
+ * has been executed, the debugger will also catch any BRK opcode. Use the
+ * BREAK function declared below to insert additional breakpoints into your
+ * code.
+ *
+ * There are currently a lot of things that cannot be debugged, graphical
+ * applications are an example. The debugger does not save your screen
+ * contents, so even your text screen gets destroyed. However, you can
+ * debug the C and runtime library, even if the debugger is using this
+ * stuff itself.
+ *
+ * Note: When using the debugger, there are some other identifiers with
+ * external linkage, that start with Dbg. Avoid those names if you use the
+ * module.
+ */
+
+
+
+#ifndef _DBG_H
+#define _DBG_H
+
+
+
+/*****************************************************************************/
+/*			      Utuility functions			     */
+/*****************************************************************************/
+
+
+
+unsigned __fastcall__ DbgDisAsm (unsigned Addr, char* Buf, unsigned char Len);
+/* Disassemble one instruction at address addr into the given buffer.
+ * The resulting line has the format, "AAAA__BB_BB_BB___OPC_OPERAND",
+ * where AAAA is the hexadecimal representation of addr, BB are the
+ * bytes (in hex) that make the instruction, OPC is the mnemonic, and
+ * OPERAND is an operand for the instruction.
+ * The buffer is filled with spaces up to the given length and terminated as
+ * a usual C string. NOTE: Buf must be able to hold Len+1 characters.
+ * The function returns the length of the disassembled instruction, so,
+ * to disassemble the next instruction, add the return value to addr
+ * and call the function again.
+ */
+
+unsigned __fastcall__ DbgDisAsmLen (unsigned Addr);
+/* Disassemble one instruction, but do only return the length, do not
+ * create a visible representation. This function is useful when
+ * disassembling backwards, it is much faster than DbgDisAsm.
+ */
+
+int __fastcall__ DbgIsRAM (unsigned Addr);
+/* Return true if we can read and write the given address */
+
+char* DbgMemDump (unsigned Addr, char* Buf, unsigned char Len);
+/* Create a line of a memory dump in the given buffer. The buffer contains
+ * the starting address (4 digits hex), then Len bytes in this format:
+ * "AAAA__XX_YY_ZZ_...". The passed char buffer must hold Len*3+5 bytes
+ * plus a terminator byte.
+ * The function does not work correctly if the created string is longer
+ * than 255 bytes.
+ * The return value is Buf.
+ */
+
+
+
+/*****************************************************************************/
+/*			   High level user interface   			     */
+/*****************************************************************************/
+
+
+
+void __fastcall__ DbgInit (unsigned unused);
+/* Initialize the debugger. Use 0 as parameter. The debugger will popup on
+ * next brk encountered.
+ */
+
+#define BREAK()	       	__asm__ ("\tbrk")
+/* Use this to insert breakpoints into your code */
+
+
+
+/* End of dbg.h */
+#endif
+
+
+