ref: 230f849229f8443703ab281bd1f1cd3ef4eb6d6e
dir: /src/asm/rgbasm.1/
.\" .\" This file is part of RGBDS. .\" .\" Copyright (c) 2010-2019, Anthony J. Bentley and RGBDS contributors. .\" .\" SPDX-License-Identifier: MIT .\" .Dd July 8, 2019 .Dt RGBASM 1 .Os .Sh NAME .Nm rgbasm .Nd Game Boy assembler .Sh SYNOPSIS .Nm .Op Fl EhLVvw .Op Fl b Ar chars .Op Fl D Ar name Ns Op = Ns Ar value .Op Fl g Ar chars .Op Fl i Ar path .Op Fl M Ar depend_file .Op Fl o Ar out_file .Op Fl p Ar pad_value .Op Fl r Ar recursion_depth .Op Fl W Ar warning .Ar .Sh DESCRIPTION The .Nm program creates an RGB object file from an assembly source file. The input .Ar file can be a file path, or .Cm \- denoting .Cm stdin . .Pp Note that options can be abbreviated as long as the abbreviation is unambiguous: .Fl Fl verb is .Fl Fl verbose , but .Fl Fl ver is invalid because it could also be .Fl Fl version . The arguments are as follows: .Bl -tag -width Ds .It Fl b Ar chars , Fl Fl binary-digits Ar chars Change the two characters used for binary constants. The defaults are 01. .It Fl D Ar name Ns Oo = Ns Ar value Oc , Fl Fl define Ar name Ns Oo = Ns Ar value Oc Add a string symbol to the compiled source code. This is equivalent to .Ql Ar name Ic EQUS Qq Ar value in code, or .Ql Ar name Ic EQUS Qq 1 if .Ar value is not specified. .It Fl E , Fl Fl export-all Export all labels, including unreferenced and local labels. .It Fl g Ar chars , Fl Fl gfx-chars Ar chars Change the four characters used for gfx constants. The defaults are 0123. .It Fl h , Fl Fl halt-without-nop By default, .Nm inserts a .Ic nop instruction immediately after any .Ic halt instruction. The .Fl h option disables this behavior. .It Fl i Ar path , Fl Fl include Ar path Add an include path. .It Fl L , Fl Fl preserve-ld Disable the optimization that turns loads of the form .Ic LD [$FF00+n8],A into the opcode .Ic LDH [$FF00+n8],A in order to have full control of the result in the final ROM. .It Fl M Ar depend_file , Fl Fl dependfile Ar depend_file Print .Xr make 1 dependencies to .Ar depend_file . .It Fl o Ar out_file , Fl Fl output Ar out_file Write an object file to the given filename. .It Fl p Ar pad_value , Fl Fl pad-value Ar pad_value When padding an image, pad with this value. The default is 0x00. .It Fl r Ar recursion_depth , Fl Fl recursion-depth Ar recursion_depth Specifies the recursion depth at which RGBASM will assume being in an infinite loop. .It Fl V , Fl Fl version Print the version of the program and exit. .It Fl v , Fl Fl verbose Be verbose. .It Fl W Ar warning , Fl Fl warning Ar warning Set warning flag .Ar warning . A warning message will be printed if .Ar warning is an unknown warning flag. See the .Sx DIAGNOSTICS section for a list of warnings. .It Fl w Disable all warning output, even when turned into errors. .El .Sh DIAGNOSTICS Warnings are diagnostic messages that indicate possibly erroneous behavior that does not necessarily compromise the assembling process. The following options alter the way warnings are processed. .Bl -tag -width Ds .It Fl Werror Make all warnings into errors. .It Fl Werror= Make the specified warning into an error. A warning's name is appended .Pq example: Fl Werror=obsolete , and this warning is implicitly enabled and turned into an error. This is an error if used with a meta warning, such as .Fl Werror=all . .El .Pp The following warnings are .Dq meta warnings, that enable a collection of other warnings. If a specific warning is toggled via a meta flag and a specific one, the more specific one takes priority. The position on the command-line acts as a tie breaker, the last one taking effect. .Bl -tag -width Ds .It Fl Wall This enables warnings that are likely to indicate an error or undesired behavior, and that can easily be fixed. .It Fl Wextra This enables extra warnings that are less likely to pose a problem, but that may still be wanted. .It Fl Weverything Enables literally every warning. .El .Pp The following warnings are actual warning flags; with each description, the corresponding warning flag is included. Note that each of these flag also has a negation (for example, .Fl Wempty-entry enables the warning that Fl Wno-empty-entry disables). Only the non-default flag is listed here. Ignoring the .Dq no- prefix, entries are listed alphabetically. .Bl -tag -width Ds .It Fl Wbuiltin-args Warn about incorrect arguments to built-in functions, such as .Fn STRSUB with indexes outside of the string's bounds. This warning is enabled by .Fl Wall . .It Fl Wdiv Warn when dividing the smallest negative integer by -1, which yields itself due to integer overflow. .It Fl Wempty-entry Warn when an empty entry is encountered in a .Ic db , dw , dl list. This warning is enabled by .Fl Wextra . .It Fl Wlarge-constant Warn when a constant too large to fit in a signed 32-bit integer is encountered. This warning is enabled by .Fl Wall . .It Fl Wlong-string Warn when a string too long to fit in internal buffers is encountered. This warning is enabled by .Fl Wall . .It Fl Wobsolete Warn when obsolete constructs such as the .Ic jp [hl] instruction or .Cm HOME section type are encountered. This warning is enabled by .Fl Wextra . .It Fl Wshift Warn when shifting triggers C undefined behavior, potentially causing unpredictable behavior. Shfting behavior will be changed and this warning removed before next release. .It Fl Wno-user Warns when the built-in function .Fn WARN is executed. .El .Sh EXAMPLES You can assemble a source file in two ways. Straightforward way: .Pp .Bd -literal -offset indent $ rgbasm -o bar.o foo.asm .Ed .Pp Pipes way: .Pp .Bd -literal -offset indent $ cat foo.asm | rgbasm -o bar.o - $ rgbasm -o bar.o - < foo.asm .Ed .Pp The resulting object file is not yet a usable ROM image \(em it must first be run through .Xr rgblink 1 and then .Xr rgbfix 1 . .Sh BUGS Please report bugs on .Lk https://github.com/rednex/rgbds/issues GitHub . .Sh SEE ALSO .Xr rgbasm 5 , .Xr rgbfix 1 , .Xr rgblink 1 , .Xr rgbds 5 , .Xr rgbds 7 , .Xr gbz80 7 .Sh HISTORY .Nm was originally written by Carsten S\(/orensen as part of the ASMotor package, and was later packaged in RGBDS by Justin Lloyd. It is now maintained by a number of contributors at .Lk https://github.com/rednex/rgbds .