c-microblaze.texi revision 1.1.1.1.8.1
1 @c Copyright 2009, 2011 2 @c Free Software Foundation, Inc. 3 @c This is part of the GAS manual. 4 @c For copying conditions, see the file as.texinfo. 5 @ifset GENERIC 6 @page 7 @node MicroBlaze-Dependent 8 @chapter MicroBlaze Dependent Features 9 @end ifset 10 @ifclear GENERIC 11 @node Machine Dependencies 12 @chapter MicroBlaze Dependent Features 13 @end ifclear 14 15 @cindex MicroBlaze architectures 16 The Xilinx MicroBlaze processor family includes several variants, all using 17 the same core instruction set. This chapter covers features of the @sc{gnu} 18 assembler that are specific to the MicroBlaze architecture. For details about 19 the MicroBlaze instruction set, please see the @cite{MicroBlaze Processor 20 Reference Guide (UG081)} available at www.xilinx.com. 21 22 @cindex MicroBlaze support 23 @menu 24 * MicroBlaze Directives:: Directives for MicroBlaze Processors. 25 * MicroBlaze Syntax:: Syntax for the MicroBlaze 26 @end menu 27 28 @node MicroBlaze Directives 29 @section Directives 30 @cindex MicroBlaze directives 31 A number of assembler directives are available for MicroBlaze. 32 33 @table @code 34 @item .data8 @var{expression},... 35 This directive is an alias for @code{.byte}. Each expression is assembled 36 into an eight-bit value. 37 38 @item .data16 @var{expression},... 39 This directive is an alias for @code{.hword}. Each expression is assembled 40 into an 16-bit value. 41 42 @item .data32 @var{expression},... 43 This directive is an alias for @code{.word}. Each expression is assembled 44 into an 32-bit value. 45 46 @item .ent @var{name}[,@var{label}] 47 This directive is an alias for @code{.func} denoting the start of function 48 @var{name} at (optional) @var{label}. 49 50 @item .end @var{name}[,@var{label}] 51 This directive is an alias for @code{.endfunc} denoting the end of function 52 @var{name}. 53 54 @item .gpword @var{label},... 55 This directive is an alias for @code{.rva}. The resolved address of @var{label} 56 is stored in the data section. 57 58 @item .weakext @var{label} 59 Declare that @var{label} is a weak external symbol. 60 61 @item .rodata 62 Switch to .rodata section. Equivalent to @code{.section .rodata} 63 64 @item .sdata2 65 Switch to .sdata2 section. Equivalent to @code{.section .sdata2} 66 67 @item .sdata 68 Switch to .sdata section. Equivalent to @code{.section .sdata} 69 70 @item .bss 71 Switch to .bss section. Equivalent to @code{.section .bss} 72 73 @item .sbss 74 Switch to .sbss section. Equivalent to @code{.section .sbss} 75 @end table 76 77 @node MicroBlaze Syntax 78 @section Syntax for the MicroBlaze 79 @menu 80 * MicroBlaze-Chars:: Special Characters 81 @end menu 82 83 @node MicroBlaze-Chars 84 @subsection Special Characters 85 86 @cindex line comment character, MicroBlaze 87 @cindex MicroBlaze line comment character 88 The presence of a @samp{#} on a line indicates the start of a comment 89 that extends to the end of the current line. 90 91 If a @samp{#} appears as the first character of a line, the whole line 92 is treated as a comment, but in this case the line can also be a 93 logical line number directive (@pxref{Comments}) or a 94 preprocessor control command (@pxref{Preprocessing}). 95 96 @cindex line separator, MicroBlaze 97 @cindex statement separator, MicroBlaze 98 @cindex MicroBlaze line separator 99 The @samp{;} character can be used to separate statements on the same 100 line. 101
Indexes created Tue Jul 21 00:24:56 UTC 2026