ref: 928b347dfcaf860f0a4e3519fb87e87db094001d
dir: /src/link/rgblink.5/
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.Dd March 27, 2017
.Dt RGBLINK 5
.Os RGBDS Manual
.Sh NAME
.Nm rgblink
.Nd linkerscript file format
.Sh DESCRIPTION
The linkerscript is an external file that allows the user to specify the
order of sections without the need for doing so before assembling each object
file.
.Pp
The placement of sections specified in the linkerscript is done before the
sections whose placement is defined in the source code.
.Pp
A linkerscript consists on a series of banks followed by a list of sections
and, optionally, commands.
They can be lowercase or uppercase, it is ignored.
Any line can contain a comment starting with
.Ql \&;
that ends at the end of the line:
.Pp
ROMX $F ; This is a comment
"Functions to read array"
ALIGN 8
"Array aligned to 256 bytes"
WRAMX 2
"Some variables"
.Pp
Numbers can be in decimal or hexadecimal format (the prefix is
.Ql $ ) .
It is an error if any bank or command is found before setting a bank.
.Pp
The possible bank types are: ROM0, ROMX, VRAM, WRAM0, WRAMX, OAM and HRAM.
Types ROMX, VRAM, WRAMX and SRAM are banked, which means that it is needed to
specify a bank after the type.
.Pp
When a new bank statement is found, sections found after it will be placed
right from the beginning of that bank.
If the linkerscript switches to a different bank and then it comes back to the
previous one it will continue from the last address that was used.
.Pp
The only two commands are ORG and ALIGN:
.Bl -bullet
.It
ORG sets the address in which new sections will be placed.
It can not be lower than the current address.
.It
ALIGN will increase the address until it is aligned to the specified boundary
(it tries to set to 0 the number of bits specified after the command: ALIGN 8
will align to $100).
.El
.Pp
Note: The bank, alignment, address and type of sections can be specified both
in the source code and in the linkerscript.
For a section to be able to be placed with the linkerscript the bank must be
left unassigned in the source code or be the same as the one specified in the
linkerscript. The address and alignment musn't be set.
.Sh SEE ALSO
.Xr rgbasm 1 ,
.Xr rgblink 1 ,
.Xr rgbfix 1 ,
.Xr rgbds 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 https://github.com/rednex/rgbds.