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81 lines
2.4 KiB
Plaintext
81 lines
2.4 KiB
Plaintext
@c Copyright (C) 2006-2015 Free Software Foundation, Inc.
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@c This is part of the GAS manual.
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@c For copying conditions, see the file as.texinfo.
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@page
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@node xc16x-Dependent
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@chapter Infineon xc16x Dependent Features
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@cindex xc16x support
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@menu
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* xc16x Directives:: xc16x Machine Directives
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* xc16x Syntax:: xc16x Syntax
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@end menu
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@node xc16x Directives
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@section xc16x Machine Directives
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The xc16x version of the assembler supports the following machine
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directives:
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@table @code
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@cindex @code{align} directive, xc16x
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@item .align
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This directive aligns the section program counter on the next 2-byte
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boundary.
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@cindex @code{byte} directive, xc16x
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@item .byte @var{expr}
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This directive assembles a half-word (8-bit) constant.
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@cindex @code{word} directive, xc16x
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@item .word @var{expr}
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This assembles a word (16-bit) constant.
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@cindex @code{ascii} directive, xc16x
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@item .ascii "@var{ascii}"
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This directive used for copying @var{str} into the object file.
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The string is terminated with a null byte.
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@cindex @code{set} directive, xc16x
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@item .set @var{symbol}, @var{value}
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This directive creates a symbol named @var{symbol} which is an alias for
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another symbol (possibly not yet defined). This should not be confused
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with the mnemonic @code{set}, which is a legitimate xc16x instruction.
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@cindex @code{bss} directive, xc16x
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@item .bss @var{symbol}, @var{length}
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Reserve @var{length} bytes in the bss section for a local @var{symbol},
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aligned to the power of two specified by @var{align}. @var{length} and
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@var{align} must be positive absolute expressions. This directive
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differs from @samp{.lcomm} only in that it permits you to specify
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an alignment.
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@end table
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@node xc16x Syntax
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@section xc16x Syntax
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@menu
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* xc16x-Chars:: Special Characters
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@end menu
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@node xc16x-Chars
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@subsection Special Characters
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@cindex line comment character, xc16x
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@cindex xc16c line comment character
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The presence of a @samp{;} appearing anywhere on a line indicates the
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start of a comment that extends to the end of that line.
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If a @samp{#} appears as the first character of a line then the whole
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line is treated as a comment, but in this case the line can also be a
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logical line number directive (@pxref{Comments}) or a preprocessor
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control command (@pxref{Preprocessing}).
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@cindex line separator, xc16x
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@cindex statement separator, xc16x
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@cindex xc16x line separator
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The XC16X assembler does not support a line separator character.
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