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127 lines
5.6 KiB
C
127 lines
5.6 KiB
C
/*****************************************************************************/
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/* */
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/* dbg.h */
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/* */
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/* Debugger module interface */
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/* */
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/* */
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/* */
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/* (C) 1998-2000 Ullrich von Bassewitz */
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/* Wacholderweg 14 */
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/* D-70597 Stuttgart */
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/* EMail: uz@musoftware.de */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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/*
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* This is the interface to the cc65 debugger. Since many of the functions
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* used for the debugger are quite usable even in another context, they
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* are declared here.
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*
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* To use the debugger, just call DbgStart in your application. This will
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* clear the screen and startup the debugger with the program counter
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* pointing to the next instruction after the call to DbgStart. Once DbgStart
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* has been executed, the debugger will also catch any BRK opcode. Use the
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* BREAK function declared below to insert additional breakpoints into your
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* code.
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*
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* There are currently a lot of things that cannot be debugged, graphical
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* applications are an example. The debugger does not save your screen
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* contents, so even your text screen gets destroyed. However, you can
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* debug the C and runtime library, even if the debugger is using this
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* stuff itself.
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*
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* Note: When using the debugger, there are some other identifiers with
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* external linkage, that start with Dbg. Avoid those names if you use the
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* module.
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*/
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#ifndef _DBG_H
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#define _DBG_H
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/*****************************************************************************/
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/* Utuility functions */
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/*****************************************************************************/
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unsigned __fastcall__ DbgDisAsm (unsigned Addr, char* Buf, unsigned char Len);
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/* Disassemble one instruction at address addr into the given buffer.
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* The resulting line has the format, "AAAA__BB_BB_BB___OPC_OPERAND",
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* where AAAA is the hexadecimal representation of addr, BB are the
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* bytes (in hex) that make the instruction, OPC is the mnemonic, and
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* OPERAND is an operand for the instruction.
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* The buffer is filled with spaces up to the given length and terminated as
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* a usual C string. NOTE: Buf must be able to hold Len+1 characters.
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* The function returns the length of the disassembled instruction, so,
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* to disassemble the next instruction, add the return value to addr
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* and call the function again.
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*/
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unsigned __fastcall__ DbgDisAsmLen (unsigned Addr);
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/* Disassemble one instruction, but do only return the length, do not
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* create a visible representation. This function is useful when
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* disassembling backwards, it is much faster than DbgDisAsm.
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*/
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int __fastcall__ DbgIsRAM (unsigned Addr);
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/* Return true if we can read and write the given address */
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char* DbgMemDump (unsigned Addr, char* Buf, unsigned char Len);
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/* Create a line of a memory dump in the given buffer. The buffer contains
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* the starting address (4 digits hex), then Len bytes in this format:
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* "AAAA__XX_YY_ZZ_...". The passed char buffer must hold Len*3+5 bytes
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* plus a terminator byte.
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* The function does not work correctly if the created string is longer
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* than 255 bytes.
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* The return value is Buf.
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*/
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/*****************************************************************************/
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/* High level user interface */
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/*****************************************************************************/
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void __fastcall__ DbgInit (unsigned unused);
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/* Initialize the debugger. Use 0 as parameter. The debugger will popup on
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* next brk encountered.
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*/
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#define BREAK() __asm__ ("\tbrk")
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/* Use this to insert breakpoints into your code */
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/* End of dbg.h */
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#endif
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