mirror of
https://github.com/mauiaaron/apple2.git
synced 2024-11-04 18:04:40 +00:00
155 lines
4.8 KiB
Plaintext
155 lines
4.8 KiB
Plaintext
*************************************************************************
|
|
* *
|
|
* Apple II debugger routines for the Linux-x86 Apple II emulator. *
|
|
* by Aaron Culliney - chernabog@baldmountain.bbn.com - (C) 1998 *
|
|
* *
|
|
* My code changes have nothing to do with my employer, GTE *
|
|
* Internetworking, BBN Technologies. They were written completely on my*
|
|
* own time and on my own machine. *
|
|
* *
|
|
*************************************************************************
|
|
|
|
The debugger console is a mid-size hack onto the main emulator code.
|
|
I did it b/c I wanted to fool around with some of my old games while
|
|
they were running and to debug the emulator itself.
|
|
The code is kinda ugly in some areas, but seems robust enough; (I've
|
|
used flex to handle most of the dangerous UI stuff). It runs a bit
|
|
slower than when you're in unrestricted emulation mode because it's
|
|
doing a lot of switching between C code and asm, copying state, and
|
|
checking breakpoints/watchpoints.
|
|
|
|
|
|
KNOWN PROBLEMS:
|
|
--------------
|
|
|
|
When you hit a watchpoint or breakpoint, you have to step over it
|
|
before you can use the g{o}, f{inish}, or u{ntil} commands again.
|
|
|
|
----------------------------------------------------------------------------
|
|
|
|
Usage:
|
|
-----
|
|
|
|
F7 - enters the debugger. (actually we wait until we've finished with
|
|
the current 6502 instruction before we enter the debugger so we're all
|
|
synched up if/when we start stepping the machine).
|
|
|
|
ESC - exits the debugger console.
|
|
|
|
General Command format:
|
|
|
|
command {optional part} <mandatory part> (this | that)
|
|
|
|
----------------------------------------------------------------------------
|
|
Disassembling Apple II main memory and language card memory:
|
|
|
|
d{is} {language card bank} {/bank/}{addrs} {+}{len}
|
|
|
|
Examples:
|
|
"d" - disassemble from current location
|
|
"dis +5" - disassemble from current location +5
|
|
"dis /01/2000" - (128k (//e) specific)
|
|
"dis lc1 d000 5" - disassemble memory +5 at lang card 1 0xd000
|
|
|
|
Note: {addrs} can be (d000 <-> ffff) or (0 <-> 2fff) for the language
|
|
card.
|
|
|
|
----------------------------------------------------------------------------
|
|
Dumping memory:
|
|
|
|
m{em} {lc1|lc2} {addrs} {+}{len}
|
|
a{scii} {lc1|lc2} {addrs} {+}{len}
|
|
|
|
Examples:
|
|
|
|
"mem" - dump memory at current location
|
|
"m dead" - dump memory at 0xDEAD
|
|
"m lc2 2fff 1" - dump memory at lang card 2 0x2FFF +1
|
|
"ascii /01/400" - (128k (//e) specific)
|
|
|
|
Note: {addrs} can be (d000 <-> ffff) or (0 <-> 2fff) for the language
|
|
card. Also you need to specify the {addrs} if you're examining lc
|
|
memory.
|
|
|
|
----------------------------------------------------------------------------
|
|
Setting memory:
|
|
<addrs> {lc1|lc2} : <byteseq>
|
|
|
|
"4000:deadc0de" - set memory at 0x4000 to 0xDEADC0DE
|
|
"50lc2:def" - set memory at lang bank 2 0x50 to 0xDE0F
|
|
|
|
Note: {addrs} can be (d000 <-> ffff) or (0 <-> 2fff) for the language
|
|
card.
|
|
|
|
----------------------------------------------------------------------------
|
|
Displaying machine state (registers, language card, drive, softswitches):
|
|
|
|
r{egs} - registers
|
|
l{ang} - language card settings
|
|
dr{ive} - disk drive settings
|
|
vm - other virtual machine settings
|
|
|
|
----------------------------------------------------------------------------
|
|
Stepping the machine:
|
|
|
|
(s{tep} | n{ext}) {len}
|
|
f{inish}
|
|
u{ntil}
|
|
g{o} {addr}
|
|
|
|
-*step* or *next* 0-255 instructions.
|
|
|
|
-*finish* current stack-frame (stop at RTS).
|
|
|
|
-step *until* PC == next instruction (good for finishing loops).
|
|
|
|
-*go* or jump to {addr} and continue executing until user hits a key.
|
|
|
|
----------------------------------------------------------------------------
|
|
Searching and setting/unsetting memory breakpoints and watchpoints:
|
|
|
|
sea{rch} {lc1|lc2} <byteseq>
|
|
|
|
"se deadc0de" - search for 0xDEADC0DE
|
|
"search lc2 def" - search lang bank2 (and lang card) for 0xDEF
|
|
|
|
(b{reak} | w{atch}) {addr}
|
|
br{eak} op <byte>
|
|
(c{lear} | i{gnore}) {num}
|
|
c{lear} op <byte>
|
|
sta{tus} - show status of memory watch/breakpoints
|
|
op{codes} - show opcodes that we're stopping at
|
|
|
|
"w c0e9" - watch memory at C0E9
|
|
"br" - break at current PC
|
|
"br op 20" - break on opcode 20
|
|
"clear 1" - clear breakpoint 1
|
|
"ig" - ignore all watchpoints
|
|
"cl op 20" - clear break on opcode 20
|
|
|
|
-break or watch addrs. (use in conjunction with g{o})
|
|
|
|
-clear breakpoints, ignore watchpoints.
|
|
|
|
-show break and watchpoint status.
|
|
|
|
Note: breakpoints and watchpoints persist even when you exit the
|
|
debugger console. They are only reset if you clear/ignore them or
|
|
virtually reboot.
|
|
|
|
|
|
----------------------------------------------------------------------------
|
|
Loading and saving state:
|
|
|
|
bload <file> <addrs>
|
|
bsave <file> /<bank>/<addrs> <len>
|
|
|
|
bload binary 8000 - load file into memory
|
|
bsave pic /0/2000 2000 - save memory to file
|
|
|
|
|
|
----------------------------------------------------------------------------
|
|
Miscellaneous:
|
|
|
|
fr{esh} - clear screen of graphics
|