To aid users making the transition to gnu ld from the MRI linker, ld can use MRI compatible linker scripts as an alternative to the more general-purpose linker scripting language described in Scripts. MRI compatible linker scripts have a much simpler command set than the scripting language otherwise used with ld. gnu ld supports the most commonly used MRI linker commands; these commands are described here.
In general, MRI scripts aren't of much use with the
file format, since it only has three sections and MRI scripts lack some
features to make use of them.
You can specify a file containing an MRI-compatible script using the ‘-c’ command-line option.
Each command in an MRI-compatible script occupies its own line; each command line starts with the keyword that identifies the command (though blank lines are also allowed for punctuation). If a line of an MRI-compatible script begins with an unrecognized keyword, ld issues a warning message, but continues processing the script.
Lines beginning with ‘*’ are comments.
You can write these commands using all upper-case letters, or all lower case; for example, ‘chip’ is the same as ‘CHIP’. The following list shows only the upper-case form of each command.
ABSOLUTEcommand to restrict the sections that will be present in your output program. If the
ABSOLUTEcommand is used at all in a script, then only the sections named explicitly in
ABSOLUTEcommands will appear in the linker output. You can still use other input sections (whatever you select on the command line, or using
LOAD) to resolve addresses in the output file.
in-secname may be an integer.
OUTPUT_FORMATcommand in the more general linker language, but restricted to one of these output formats:
LIST may be followed by anything on the
same line, with no change in its effect.
NAMEis equivalent to the command-line option ‘-o’ or the general script language command
ORDERsecname secname secname
ORDERcommand. The sections you list with
ORDERwill appear first in your output file, in the order specified.
SECTcommand to specify the start address (expression) for section secname. If you have more than one
SECTstatement for the same secname, only the first sets the start address.