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155 lines
4.8 KiB
Plaintext
155 lines
4.8 KiB
Plaintext
*************************************************************************
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* *
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* Apple II debugger routines for the Linux-x86 Apple II emulator. *
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* by Aaron Culliney - chernabog@baldmountain.bbn.com - (C) 1998 *
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* *
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* My code changes have nothing to do with my employer, GTE *
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* Internetworking, BBN Technologies. They were written completely on my*
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* own time and on my own machine. *
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* *
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*************************************************************************
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The debugger console is a mid-size hack onto the main emulator code.
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I did it b/c I wanted to fool around with some of my old games while
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they were running and to debug the emulator itself.
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The code is kinda ugly in some areas, but seems robust enough; (I've
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used flex to handle most of the dangerous UI stuff). It runs a bit
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slower than when you're in unrestricted emulation mode because it's
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doing a lot of switching between C code and asm, copying state, and
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checking breakpoints/watchpoints.
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KNOWN PROBLEMS:
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--------------
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When you hit a watchpoint or breakpoint, you have to step over it
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before you can use the g{o}, f{inish}, or u{ntil} commands again.
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----------------------------------------------------------------------------
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Usage:
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-----
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F7 - enters the debugger. (actually we wait until we've finished with
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the current 6502 instruction before we enter the debugger so we're all
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synched up if/when we start stepping the machine).
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ESC - exits the debugger console.
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General Command format:
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command {optional part} <mandatory part> (this | that)
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----------------------------------------------------------------------------
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Disassembling Apple II main memory and language card memory:
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d{is} {language card bank} {/bank/}{addrs} {+}{len}
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Examples:
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"d" - disassemble from current location
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"dis +5" - disassemble from current location +5
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"dis /01/2000" - (128k (//e) specific)
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"dis lc1 d000 5" - disassemble memory +5 at lang card 1 0xd000
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Note: {addrs} can be (d000 <-> ffff) or (0 <-> 2fff) for the language
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card.
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----------------------------------------------------------------------------
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Dumping memory:
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m{em} {lc1|lc2} {addrs} {+}{len}
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a{scii} {lc1|lc2} {addrs} {+}{len}
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Examples:
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"mem" - dump memory at current location
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"m dead" - dump memory at 0xDEAD
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"m lc2 2fff 1" - dump memory at lang card 2 0x2FFF +1
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"ascii /01/400" - (128k (//e) specific)
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Note: {addrs} can be (d000 <-> ffff) or (0 <-> 2fff) for the language
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card. Also you need to specify the {addrs} if you're examining lc
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memory.
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----------------------------------------------------------------------------
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Setting memory:
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<addrs> {lc1|lc2} : <byteseq>
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"4000:deadc0de" - set memory at 0x4000 to 0xDEADC0DE
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"50lc2:def" - set memory at lang bank 2 0x50 to 0xDE0F
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Note: {addrs} can be (d000 <-> ffff) or (0 <-> 2fff) for the language
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card.
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----------------------------------------------------------------------------
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Displaying machine state (registers, language card, drive, softswitches):
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r{egs} - registers
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l{ang} - language card settings
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dr{ive} - disk drive settings
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vm - other virtual machine settings
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----------------------------------------------------------------------------
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Stepping the machine:
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(s{tep} | n{ext}) {len}
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f{inish}
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u{ntil}
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g{o} {addr}
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-*step* or *next* 0-255 instructions.
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-*finish* current stack-frame (stop at RTS).
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-step *until* PC == next instruction (good for finishing loops).
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-*go* or jump to {addr} and continue executing until user hits a key.
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----------------------------------------------------------------------------
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Searching and setting/unsetting memory breakpoints and watchpoints:
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sea{rch} {lc1|lc2} <byteseq>
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"se deadc0de" - search for 0xDEADC0DE
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"search lc2 def" - search lang bank2 (and lang card) for 0xDEF
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(b{reak} | w{atch}) {addr}
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br{eak} op <byte>
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(c{lear} | i{gnore}) {num}
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c{lear} op <byte>
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sta{tus} - show status of memory watch/breakpoints
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op{codes} - show opcodes that we're stopping at
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"w c0e9" - watch memory at C0E9
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"br" - break at current PC
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"br op 20" - break on opcode 20
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"clear 1" - clear breakpoint 1
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"ig" - ignore all watchpoints
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"cl op 20" - clear break on opcode 20
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-break or watch addrs. (use in conjunction with g{o})
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-clear breakpoints, ignore watchpoints.
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-show break and watchpoint status.
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Note: breakpoints and watchpoints persist even when you exit the
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debugger console. They are only reset if you clear/ignore them or
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virtually reboot.
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----------------------------------------------------------------------------
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Loading and saving state:
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bload <file> <addrs>
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bsave <file> /<bank>/<addrs> <len>
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bload binary 8000 - load file into memory
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bsave pic /0/2000 2000 - save memory to file
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----------------------------------------------------------------------------
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Miscellaneous:
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fr{esh} - clear screen of graphics
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