Assembler Directives and
Programming Aids
Programming Aids
The Assembler provides a series of standard space and subspace definitions that you can use to simplify the writing of an assembly program. These definitions are duplicated in the system file /usr/lib/pcc_prefix.s. Because this file is relatively large and may change with new releases of the Assembler, you can view the most recent version of the file on your terminal screen by typing the command:
more /usr/lib/pcc_prefix.s
Table
Table | Predefined Subspace Directives | |
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Directive | Space Name | Default Parameters |
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.BSS | .space $PRIVATE$,'' | PRIVATE,SPNUM=1,SORT=16 |
| .subspa $BSS$, | QUAD=1,ALIGN=8,ACCESS=0x1f, SORT=82,ZERO |
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.CODE | .space $TEXT$,'' | SPNUM=0,SORT=8 |
| .subspa $CODE$, | QUAD=0,ALIGN=8,ACCESS=0x2c,SORT=24 |
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.DATA | .space $PRIVATE$,'' | PRIVATE,SPNUM=1,SORT=16 |
| .subspa $DATA$, | QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=24 |
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.FIRST | .space $TEXT$,'' | SPNUM=0,SORT=8 |
| .subspa $FIRST$, | QUAD=0,ALIGN=2048,ACCESS=0x2c, SORT=4,FIRST |
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.GATE | .space $TEXT$,'' | SPNUM=0,SORT=8 |
| .subspa $GATE$, | QUAD=0,ALIGN=8,ACCESS=0x4c, |
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| SORT=84,CODE_ONLY |
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.GLOBAL | .space $PRIVATE$,'' | PRIVATE,SPNUM=1,SORT=16 |
| .subspa $GLOBAL$, | QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=40 |
| .IMPORT $global$ |
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.GNTT | .space $DEBUG$,'' | SPNUM=2,PRIVATE,UNLOADABLE,SORT=80 |
| .subspa $GNTT$, | ALIGN=4,ACCESS=0,UNLOADABLE |
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.HEADER | .space $DEBUG$,'' | SPNUM=2,PRIVATE,UNLOADABLE,SORT=80 |
| .subspa $HEADER$, | ALIGN=4,ACCESS=0,UNLOADABLE,FIRST |
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.HEAP | .space $PRIVATE$,'' | PRIVATE,SPNUM=1,SORT=16 |
| .subspa $HEAP$, | QUAD=1,ALIGN=8,ACCESS=0x1f,SORT=82 |
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.LIT | .space $TEXT$,'' | SPNUM=0,SORT=8 |
| .subspa $LIT$, | QUAD=0,ALIGN=8,ACCESS=0x2c,SORT=16 |
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116 | Chapter 4 |