UM0144 datasheet(24/92 Pages) STMICROELECTRONICS

24 / 92 page

3 ST7 Assembler

ST7 Assembler Linker

24/92

UM0144

Looking back to our example on

page 22, you should now be able to see that the 'RAM0'

class will allocate 80 to counter, 81 to address, 92 to stack in FILE1, and when the linker

meets the segment in FILE2 of the same class, serialtemp will be allocated 93, and

serialcou 94

. The same processing happens to the two 'eprom' class segments—the

second, in FILE2, will be tacked on to the end of the first in FILE1. If the FILE2 'eprom' class

segment had specified, say, the long align type instead of the default byte, then that segment

would have been put on the next long-word boundary after the end of the FILE1 'eprom'

class segment.

Combine

The <combine> argument tells the assembler and linker how to treat the segment. There are

three types to handle it:

The at-type <combine> must be used at the introduction of a class, only once.

The at-type <combine> must have one argument: the start address of the class, and may

optionally be given the end address (or limit) of the class too. If given, the linker checks that no

items in the class have gone over the limit address; if this does occur, a warning is issued at link

time. The hexadecimal numbers X and Y should not have radix specifiers.

All common-type <combine> segments that have the same class name will start at the same

address. The linker keeps track of the longest segment. common segments can be used for

sharing data across different applications.

Table 8.

Alignment types

Type

Description

Examples

byte

Any address

word

Next address on boundary

1001->1002

para

Next address on 16-byte boundary

1001->1010

Next address on 64-byte boundary

1001->1040

128

Next address on 128-byte boundary

1001->1080

page

Next address on 256-byte boundary

1001->1100

long

Next address on 4-byte boundary

1001->1004

Next address on 1k-byte boundary

1001->1400

Next address on 4K-byte boundary

1001->2000

Table 9.

Combine types

Type

Description

at:X[-Y]

Starts a new class from address X [to address Y]

common

All common segments that have the same class name will start at the same

address. This address is determined by the linker.

<none>

Follows on from end of last segment of this class.

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