.\" Copyright (c) 2015 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 July 29, 2015
.Dt MGBA 6
.Os
.Sh NAME
.Nm mgba
.Nd Game Boy Advance emulator
.Sh SYNOPSIS
.Nm mgba
.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 Game Boy Advance 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 -inset
.It 1
fatal errors
.It 2
errors
.It 4
warnings
.It 8
informative messages
.It 16
debugging messages
.It 32
stub messages for unimplemented features
.It 256
in\(hygame errors
.It 512
software interrupts
.It 1024
emulator status messages
.It 2048
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 elete Oc Ar address
Delete a breakpoint at
.Ar address .
.It Cm dis Ns Oo Cm asm Oc Ar address Op Ar count
.It Cm dis Ns Oo Cm asm Oc Ns Cm /a Ar address Op Ar count
.It Cm dis Ns Oo Cm asm Oc Ns Cm /t Ar address Op Ar count
.It Cm dis Ns Oo Cm assemble Oc Ar address Op Ar count
.It Cm dis Ns Oo Cm assemble Oc Ns Cm /a Ar address Op Ar count
.It Cm dis Ns Oo Cm assemble Oc Ns Cm /t 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 .
.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.
.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
.It Cm w/2 Ar address
.It Cm w/4 Ar address
Write a byte
.Pq Ql /1 ,
halfword
.Pq Ql /2 ,
or word
.Pq Ql /4
to
.Ar address .
.It Cm w/r Ar register
Write a word to
.Ar register .
.It Cm x/1 Ar address
.It Cm x/2 Ar address
.It Cm x/4 Ar address
Examine bytes
.Pq Ql /1 ,
halfwords
.Pq Ql /2 ,
or words
.Pq Ql /4
from
.Ar address .
.It Cm \&!\ \&
Break into the attached debugger.
.El
.Sh FILES
.Bl -tag -width ~/.config/mgba/config.ini -compact
.It Pa ~/.config/mgba/config.ini
Default
.Nm
configuration file.
.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