C166/ST10 Cross-Assembler, Linker/Locator, Utilities ... - Tasking

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Assembler Directives 7−61
Combine Type
Description
GLOBAL All sections of the same name that are defined to be
global are combined in contiguous memory. The length of
the resulting section is the sum of the lengths of the
sections combined. GLOBAL goes one step further than
PUBLIC in that it also combines sections (with the same
name) in different TASKS.
COMMON All sections of the same name that are defined to be
common are overlapped to form one section. All of the
combined sections begin at the same physical address.
The implementation of the combination of sections with a
COMMON combine type requires the next attributes of
the sections which are combined to be equal:
− section size
− align type
− memory type
− class
− group
SYSSTACK All sections of the same name that are defined to be
system stack are combined to one section so that each
combined section ends at the same address (overlaid
against high memory) and grows ’downward’. The length
of the stack section after combination is equal to the sum
of the lengths of the sections combined. The locator
places the system stack section in the internal RAM
where it can be accessed with the Stack Pointer Register.
USRSTACK All sections of the same name that are defined to be user
stack are combined to one section so that each combined
section ends at the same address (overlaid against high
memory) and grows ’downward’. The length of the stack
section after combination is equal to the sum of the
lengths of the sections combined. The user stack section
can be located at any memory address, and is accessed
as data with DPPx and offset. USRSTACK sections are
only combined at link stage.