99 lines
3.1 KiB
Text
99 lines
3.1 KiB
Text
@c Copyright (C) 2009-2022 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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@ifset GENERIC
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@page
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@node MicroBlaze-Dependent
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@chapter MicroBlaze Dependent Features
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@end ifset
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@ifclear GENERIC
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@node Machine Dependencies
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@chapter MicroBlaze Dependent Features
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@end ifclear
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@cindex MicroBlaze architectures
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The Xilinx MicroBlaze processor family includes several variants, all using
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the same core instruction set. This chapter covers features of the @sc{gnu}
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assembler that are specific to the MicroBlaze architecture. For details about
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the MicroBlaze instruction set, please see the @cite{MicroBlaze Processor
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Reference Guide (UG081)} available at www.xilinx.com.
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@cindex MicroBlaze support
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@menu
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* MicroBlaze Directives:: Directives for MicroBlaze Processors.
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* MicroBlaze Syntax:: Syntax for the MicroBlaze
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@end menu
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@node MicroBlaze Directives
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@section Directives
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@cindex MicroBlaze directives
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A number of assembler directives are available for MicroBlaze.
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@table @code
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@item .data8 @var{expression},...
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This directive is an alias for @code{.byte}. Each expression is assembled
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into an eight-bit value.
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@item .data16 @var{expression},...
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This directive is an alias for @code{.hword}. Each expression is assembled
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into an 16-bit value.
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@item .data32 @var{expression},...
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This directive is an alias for @code{.word}. Each expression is assembled
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into an 32-bit value.
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@item .ent @var{name}[,@var{label}]
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This directive is an alias for @code{.func} denoting the start of function
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@var{name} at (optional) @var{label}.
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@item .end @var{name}[,@var{label}]
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This directive is an alias for @code{.endfunc} denoting the end of function
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@var{name}.
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@item .gpword @var{label},...
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This directive is an alias for @code{.rva}. The resolved address of @var{label}
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is stored in the data section.
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@item .weakext @var{label}
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Declare that @var{label} is a weak external symbol.
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@item .rodata
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Switch to .rodata section. Equivalent to @code{.section .rodata}
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@item .sdata2
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Switch to .sdata2 section. Equivalent to @code{.section .sdata2}
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@item .sdata
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Switch to .sdata section. Equivalent to @code{.section .sdata}
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@item .bss
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Switch to .bss section. Equivalent to @code{.section .bss}
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@item .sbss
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Switch to .sbss section. Equivalent to @code{.section .sbss}
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@end table
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@node MicroBlaze Syntax
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@section Syntax for the MicroBlaze
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@menu
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* MicroBlaze-Chars:: Special Characters
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@end menu
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@node MicroBlaze-Chars
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@subsection Special Characters
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@cindex line comment character, MicroBlaze
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@cindex MicroBlaze line comment character
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The presence of a @samp{#} on a line indicates the start of a comment
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that extends to the end of the current line.
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If a @samp{#} appears as the first character of a line, the whole line
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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
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preprocessor control command (@pxref{Preprocessing}).
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@cindex line separator, MicroBlaze
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@cindex statement separator, MicroBlaze
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@cindex MicroBlaze line separator
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The @samp{;} character can be used to separate statements on the same
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line.
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