dbg.h

6502 c compiler free open source

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/*				     dbg.h				     */
/*                                                                           */
/*			   Debugger module interface			     */
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/* (C) 1998-2000 Ullrich von Bassewitz                                       */
/*               Wacholderweg 14                                             */
/*               D-70597 Stuttgart                                           */
/* EMail:        [e-mail]                                            */
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/*                                                                           */
/* This software is provided 'as-is', without any expressed or implied       */
/* warranty.  In no event will the authors be held liable for any damages    */
/* arising from the use of this software.                                    */
/*                                                                           */
/* Permission is granted to anyone to use this software for any purpose,     */
/* including commercial applications, and to alter it and redistribute it    */
/* freely, subject to the following restrictions:                            */
/*                                                                           */
/* 1. The origin of this software must not be misrepresented; you must not   */
/*    claim that you wrote the original software. If you use this software   */
/*    in a product, an acknowledgment in the product documentation would be  */
/*    appreciated but is not required.                                       */
/* 2. Altered source versions must be plainly marked as such, and must not   */
/*    be misrepresented as being the original software.                      */
/* 3. This notice may not be removed or altered from any source              */
/*    distribution.                                                          */
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/*
 * 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 DbgInit in your application. Once it has
 * been called, the debugger will catch any BRK opcode. Use the BREAK macro 
 * defined below to insert 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



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/*     	       	       	       Utility functions			     */
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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.
 */



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/*			   High level user interface   			     */
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void __fastcall__ DbgInit (unsigned unused);
/* Initialize the debugger. Use 0 as parameter. The debugger will popup on
 * next brk encountered.
 */

#define BREAK()	       	__asm__ ("brk")
/* Use this to insert breakpoints into your code */



/* End of dbg.h */
#endif