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Mapfile option

Mapping directives

A mapping directive tells ld how to map input sections to segments. Basically, you name the segment that you are mapping to and indicate what the attributes of a section must be in order to map into the named segment. The set of section_attribute_values that a section must have to map into a specific segment is called the entrance criteria for that segment. In order to be placed in a specified segment of the a.out, a section must meet the entrance criteria for a segment exactly.

A mapping directive has the following syntax:

segment_name: {section_attribute_value}* [: {file_name}+];

For a segment_name, you specify any number of section_attribute_values in any order, each separated by a space. (At most one section attribute value is allowed for each section attribute.) You can also specify that the section must come from a certain .o file(s) via the file_name substitutable. The section attributes and their valid values are as follows:


section_name:
any valid section name

section_type:
$PROGBITS
$SYMTAB
$STRTAB
$REL
$RELA
$NOTE
$NOBITS

section_flags:
?[[!]A][[!]W][[!]X]
Note the following when entering mapping directives:
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