Intel XENIX 286 Programmers Guide (86) - Tenox.tc

XENIX Programming as: Assembler
The string may contain any character in the character set except a newline. If
necessary, the escape sequence "\n" may be used in place of a newline. The string must
be enclosed within slashes (/) or within any character not used in the string. Examples:
.ascii /"hello there"/
.ascii "Warning- 07 07 \n "
.asciz *abcdefg*
The .asciz directive is especially useful because some system calls and many library
routines require null-terminated strings as arguments. Strings are normally nullterminated
in C programs, and any string constant in a C program is stored with a
terminating null, appended by the compiler.
Listing Directives
.list
.nlist
The .list and .nlist directives control output to the assembler listing file created by
using the -1 option. If .list is given, subsequent statements are passed to the listing file
as well as being processed. If .nlist is given, statements are processed but not passed to
the listing file.
The directives may be used any number of times to turn listing on and off. This is
particularly useful when certain portions of the assembly output are not desired on a
printed listing.
Block Directives
.blkb [expression
. bl kw [ expression
The .blkb and .blkw directives reserve blocks of storage where a block contains
expression bytes (for .blkb) or expression words (for .blkw). If no expression is given, 1
is assu med. The expression must be absolute and defined during pass 1.
Note that the statement
. = . + expression
may also be used to reserve blocks of storage. In this case, the block contains
expression bytes.
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