PCSX Debug console protocol description, version 1.0
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Commands number are formatted using %03X (yes)
Registers number are formatted using %02X.
Breakpoints numbers are formatted using %X
All other values are formatted using %08X, unless specified.


Client inputs:
~~~~~~~~~~~~~
Basic commands (1xx):
--------------------
100 <message>
    Sends a dumb message. Will be replied with a 200 reply, followed by the message.
101
    Gets PCSX version.
102
    Gets protocol version.
103
    Gets status
110
    Gets PC.
111 [reg]
    Gets GP register, or all, if no argument.
112
    Gets LO/HI registers.
113 [reg]
    Gets COP0 register, or all, if no argument.
114 [reg]
    Gets COP2 control register, or all, if no argument.
115 [reg]
    Gets COP2 data register, or all, if no argument.
119 [pc]
    Disassemble current PC, or given PC.
121 <reg>=<value>
    Sets a GP register. Will return a 221 message.
122 <LO|HI>=<value>
    Sets LO or HI register. Will return a 222 message.
123 <reg>=<value>
    Sets a COP0 register. Will return a 223 message.
124 <reg>=<value>
    Sets a COP2 control register. Will return a 224 message.
125 <reg>=<value>
    Sets a COP2 data register. Will return a 225 message.
130 <size>@<addr>
    Dumps a range of memory, of size bytes starting at addr.
140 <size>@<addr>
    Sets a range of memory, of size bytes starting at addr.
    Will have to send immediately exactly size bytes afterward.

Execution flow control commands (3xx):
-------------------------------------
300 [number]
    Get a list of the actual breakpoints. Will get '400' answers.
301 [number]
    Deletes a breakpoint, or all, if no arguments.
310 <address>
    Sets an exec breakpoint.
320 <address>
    Sets a read breakpoint, 1 byte / 8 bits.
321 <address>
    Sets a read breakpoint, 2 bytes / 16 bits, has to be on an even address.
322 <address>
    Sets a read breakpoint, 4 bytes / 32 bits, address has to be 4-bytes aligned.
330 <address>
    Sets a write breakpoint, 1 byte / 8 bits.
331 <address>
    Sets a write breakpoint, 2 bytes / 16 bits, has to be on an even address.
332 <address>
    Sets a write breakpoint, 4 bytes / 32 bits, address has to be 4-bytes aligned.
390
    Pauses execution. Equivalents to a breakpoint.
391
    Restarts execution.
395 [number]
    Traces execution, 1 instruction by default. Formatted using %i
396
    Save state.
397 <size>
    Load state. Will wait size bytes afterward.
398
    Soft (quick) resets.
399
    Resets.
    

Server outputs:
~~~~~~~~~~~~~~
Spontaneous messages (0xx):
--------------------------
000 <message>
    Greeting banner.
030 <number>@<PC>
    Execution hit breakpoint, PCSX is paused. Displays PC's value.

Basic commands acknowledge (2xx):
--------------------------------
200 <message>
    Sends a dumb message.
201 <message>
    Returns PCSX version.
202 <message>
    Returns protocol version.
203 <status>
    status = 0: running; = 1: paused; = 2: trace
210 PC=<value>
    Displays current PC value.
211 <reg>=<value>
    Displays one GP register value.
212 LO=<value> HI=<value>
    Displays LO/HI registers.
213 <reg>=<value>
    Displays one COP0 register value.
214 <reg>=<value>
    Displays one COP2 control register value.
215 <reg>=<value>
    Displays one COP2 data register value.
219 <message>
    Displays one line of disassembled code.
221 <reg>=<value>
    Displays one GP register value, ack for modification.
222 LO=<value> HI=<value>
    Displays LO/HI registers, ack for modification.
223 <reg>=<value>
    Displays one COP0 register value, ack for modification.
224 <reg>=<value>
    Displays one COP2 control register value, ack for modification.
225 <reg>=<value>
    Displays one COP2 data register value, ack for modification.
230 <size>
    Dumping memory. Will then raw outputs size bytes.
240 <size>@<addr>
    Memory set acknowledge.

Execution flow control commands acknowledge (4xx):
-------------------------------------------------
400 <number>@<address>-<type>
    Displays a breakpoint, where 'type' can be of E, R1, R2, R4, W1, W2 or W4.
401 <message>
    Breakpoint deleting acknowledge.
410, 420, 421, 422, 430, 431, 432 <number>
    Breakpoint adding acknowledge. Returns the number of the added breakpoint.
490 <message>
    Pausing.
491 <message>
    Resuming.
495 <message>
    Tracing.
496 <size>
    Save state. Will dump size bytes of savestate afterward.
497 <message>
    Load state acknowledge.
498 <message>
    Soft resetting.
499 <message>
    Resetting.

Error messages (5xx):
--------------------
500 <message>
    Command not understood.
511 <message>
    Invalid GPR register.
512 <message>
    Invalid LO/HI register.
513, 514 <message>
    Invalid range or address.
530 <message>
    Non existant breakpoint.
531, 532, 533 <message>
    Invalid breakpoint address.