ExpressLoad

ExpressLoad data is stored as the first segment. It must have a segment name of (case insensitive) "ExpressLoad" or "~ExpressLoad" (preferred). Previously, it may have checked for a segment kind of dynamic data but that was removed so the linker could generate it as a Skip Segment.

The segment body consists of a single LCONST record.

Header

Offset	Size	Comment
$0000	4	reserved - used for a linked list
$0004	2	number of entries - 1

Header Entry Table

For each segment: (segments are re-arranged to put static segments first)

Offset	Size	Comment
$0000	2	relative segment offset
$0002	2	flags - reserved
$0004	4	handle - reserved

Segment Number Conversion Table

For each segment:

Offset	Size	Comment
$0000	2	actual segment number

Segment Headers

For each segment:

Offset	Size	Comment
$0000	4	LCONST file mark (absolute offset of LCONST data)
$0004	4	LCONST size
$0008	4	relocation mark (absolute offset of first relocation record)
$000c	4	relocation size
$0010	1	reserved
$0011	1	label length
$0012	1	number length
$0013	1	version
$0014	4	bank size
$0018	2	kind
$001a	2	reserved
$001c	4	org
$0020	4	alignment
$0024	1	number sex
$0025	1	reserved
$0026	2	segment number
$0028	4	segment entry
$002c	2	displacement to names
$002e	2	displacement to data
.....	...	reserved
.....	...	name

n.b. -- mpw iigs linker does not generate the displacement to data field. dumpobjiigs -d does not expect the displacement to data field. ORCA/Linker and Express generate it. Expressload itself doesn't seem to care -- it uses the name displacement but not the data displacement.

See Also:

• Apple IIgs Technical Notes: #66: ExpressLoad Philosophy