TAL Reference Manual

Privileged Procedures

TAL Reference Manual—526371-001

15-5

Example of 'SG'-Equivalenced Simple Variable

This example declares a simple variable equivalent to location SG + 15 in the system

global data area:

INT item = 'SG' + 15;

'SG'-Equivalenced Definition Structure

The 'SG'-equivalenced definition structure declaration associates a definition structure

with a location relative to the base address of the system global data area.

. (period)

is the standard indirection symbol and denotes 16-bit addressing, in this case in

the system global data area.

.SG

is the system global indirection symbol and denotes 16-bit addressing in the

system global data area.

.EXT

is the extended indirection symbol and denotes 32-bit addressing.

identifier

is the identifier of a definition structure to be made equivalent to 'SG'.

'SG'

is the symbol that denotes the base address of the system global data area;

identifier is addressed relative to SG[0].

VST1503.vsd

[

index

]

offset

;

identifier

STRUCT

.SG

structure-layout

;

.EXT

.SG