.\" Copyright (c) 2015-2016 Anthony J. Bentley <anthony@anjbe.name>
.\"
.\" This Source Code Form is subject to the terms of the Mozilla Public
.\" License, v. 2.0. If a copy of the MPL was not distributed with this
.\" file, you can obtain one at https://mozilla.org/MPL/2.0/.
.Dd April 8, 2017
.Dt MEDUSA-EMU 6
.Os
.Sh NAME
.Nm -emumedusa-emu
.Nd DS emulator
.Sh SYNOPSIS
.Nm medusa-emu
.Op Fl 123456dfg
.Op Fl b Ar biosfile
.Op Fl c Ar cheatfile
.Op Fl l Ar loglevel
.Op Fl p Ar patchfile
.Op Fl s Ar n
.Op Fl v Ar moviefile
.Ar file
.Sh DESCRIPTION
.Nm
is a DS emulator.
The options are as follows:
.Bl -tag -width Ds
.It Fl 1
Scale the window 1\(mu.
.It Fl 2
Scale the window 2\(mu.
.It Fl 3
Scale the window 3\(mu.
.It Fl 4
Scale the window 4\(mu.
.It Fl 5
Scale the window 5\(mu.
.It Fl 6
Scale the window 6\(mu.
.It Fl b Ar biosfile , Fl -bios Ar biosfile
Specify a BIOS file to use during boot.
If this flag is omitted,
.Nm
will use the BIOS specified in the configuration file,
or a high\(hylevel emulated BIOS if none is specified.
.It Fl c Ar cheatfile , Fl -cheats Ar cheatfile
Apply cheat codes from
.Ar cheatfile .
.It Fl d
Start emulating via the command\(hyline debugger.
.It Fl f
Start the emulator full\(hyscreen.
.It Fl g
Start a
.Xr gdb 1
session.
By default the session starts on port 2345.
.It Fl l Ar loglevel
Log messages during emulation to
.Dv stdout .
.Ar loglevel
is a bitmask defining which types of messages to log:
.Bl -bullet -compact
.It
1 \(en fatal errors
.It
2 \(en errors
.It
4 \(en warnings
.It
8 \(en informative messages
.It
16 \(en debugging messages
.It
32 \(en stub messages for unimplemented features
.It
256 \(en in\(hygame errors
.It
512 \(en software interrupts
.It
1024 \(en emulator status messages
.It
2048 \(en serial I/O messages
.El
The default is to log warnings, errors, fatal errors, and status messages.
.It Fl p Ar patchfile , Fl -patch Ar patchfile
Specify a patch file in BPS, IPS, or UPS format.
.It Fl s Ar n , Fl -frameskip Ar n
Skip every
.Ar n
frames.
.It Fl v Ar moviefile , Fl -movie Ar moviefile
Play back a movie of recording input from
.Ar moviefile .
.El
.Sh CONTROLS
The default controls are as follows:
.Bl -hang -width "Frame advance" -compact
.It A
.Cm x
.It B
.Cm z
.It L
.Cm a
.It R
.Cm s
.It Start
.Aq Cm Enter
.It Select
.Aq Cm Backspace
.It Load state
.Cm F1 Ns \(en Ns Cm F9
.It Save state
.Ao Cm Shift Ac Ns \(hy Ns Cm F1 Ns \(en Ns Cm F9
.It Frame advance
.Ao Cm Ctrl Ac Ns \(hy Ns Cm n
.El
.Sh DEBUGGER
When
.Nm
is run with the
.Fl d
option, the command\(hyline debugger is enabled.
It supports the following commands:
.Pp
.Bl -tag -compact -width 1
.It Cm b Ns Oo Cm reak Oc Ar address
.It Cm b Ns Oo Cm reak Oc Ns Cm /a Ar address
.It Cm b Ns Oo Cm reak Oc Ns Cm /t Ar address
Set a breakpoint \(en ARM
.Pq Ql /a ,
Thumb
.Pq Ql /t ,
or the current CPU mode \(en at
.Ar address .
.It Cm c Ns Op Cm ontinue
Continue execution.
.It Cm d Ns Oo Cm elete Oc Ar address
Delete a breakpoint at
.Ar address .
.It Cm dis Ns Oo Cm asm Oc Op Ar address Op Ar count
.It Cm dis Ns Oo Cm asm Oc Ns Cm /a Op Ar address Op Ar count
.It Cm dis Ns Oo Cm asm Oc Ns Cm /t Op Ar address Op Ar count
.It Cm dis Ns Oo Cm assemble Oc Op Ar address Op Ar count
.It Cm dis Ns Oo Cm assemble Oc Ns Cm /a Op Ar address Op Ar count
.It Cm dis Ns Oo Cm assemble Oc Ns Cm /t Op Ar address Op Ar count
Disassemble
.Ar count
instructions starting at
.Ar address ,
as ARM
.Pq Ql /a ,
Thumb
.Pq Ql /t ,
or the current CPU mode.
If
.Ar count
is not specified, only disassemble the instruction at
.Ar address .
If
.Ar address
is not specified, only disassemble the current address.
.It Cm h Ns Op Cm elp
Print help.
.It Cm i Ns Op Cm nfo
.It Cm status
Print the current contents of general\(hypurpose registers and the current
program state register, and disassemble the current instruction.
.It Cm n Ns Op Cm ext
Execute the next instruction.
.It Cm p Ns Oo Cm rint Oc Ar value ...
.It Cm p Ns Oo Cm rint Oc Ns Cm /t Ar value ...
.It Cm p Ns Oo Cm rint Oc Ns Cm /x Ar value ...
Print one or more
.Ar value Ns s
as binary
.Pq Ql /t ,
hexadecimal
.Pq Ql /x ,
or decimal.
.It Cm q Ns Op Cm uit
Quit the emulator.
.It Cm reset
Reset the emulation.
.It Cm r/1 Ar address
.It Cm r/2 Ar address
.It Cm r/4 Ar address
Read a byte
.Pq Ql /1 ,
halfword
.Pq Ql /2 ,
or word
.Pq Ql /4
from
.Ar address .
.It Cm w Ns Oo Cm atch Oc Ar address
Set a watchpoint at
.Ar address .
.It Cm w/1 Ar address data
.It Cm w/2 Ar address data
.It Cm w/4 Ar address data
Write
.Ar data
as a byte
.Pq Ql /1 ,
halfword
.Pq Ql /2 ,
or word
.Pq Ql /4
to
.Ar address .
.It Cm w/r Ar register data
Write
.Ar data
as a word to
.Ar register .
.It Cm x/1 Ar address Op Ar count
.It Cm x/2 Ar address Op Ar count
.It Cm x/4 Ar address Op Ar count
Examine
.Ar count
bytes
.Pq Ql /1 ,
halfwords
.Pq Ql /2 ,
or words
.Pq Ql /4
from
.Ar address .
If
.Ar count
is not specified, examine 16 bytes, 8 halfwords, or 4 words.
.El
.Sh ENVIRONMENT
.Bl -tag -width Ds -compact
.It Ev XDG_CONFIG_HOME
The location where
.Nm
will look for the configuration directory.
If not set,
.Pa ~/.config
is used.
.El
.Sh FILES
.Bl -tag -width Ds -compact
.It Pa $XDG_CONFIG_HOME/medusa-emu/config.ini
Default
.Xr medusa-emu 6
configuration file.
.It Pa portable.ini
If this file exists in the current directory,
.Nm
will read
.Pa config.ini
from the current directory instead of
.Pa $XDG_CONFIG_HOME/medusa-emu .
.El
.Sh AUTHORS
.An Jeffrey Pfau Aq Mt jeffrey@endrift.com
.Sh HOMEPAGE
.Bl -bullet
.It
.Lk https://mgba.io/ "mGBA homepage"
.It
.Lk https://github.com/mgba-emu/mgba "Development repository"
.It
.Lk https://github.com/mgba-emu/mgba/issues "Bug tracker"
.It
.Lk https://forums.mgba.io/ "Message board"
.El