1 @c Copyright (C) 2009-2014 Free Software Foundation, Inc. 2 @c This is part of the GAS manual. 3 @c For copying conditions, see the file as.texinfo. 4 @ifset GENERIC 5 @page 6 @node MicroBlaze-Dependent 7 @chapter MicroBlaze Dependent Features 8 @end ifset 9 @ifclear GENERIC 10 @node Machine Dependencies 11 @chapter MicroBlaze Dependent Features 12 @end ifclear 13 14 @cindex MicroBlaze architectures 15 The Xilinx MicroBlaze processor family includes several variants, all using 16 the same core instruction set. This chapter covers features of the @sc{gnu} 17 assembler that are specific to the MicroBlaze architecture. For details about 18 the MicroBlaze instruction set, please see the @cite{MicroBlaze Processor 19 Reference Guide (UG081)} available at www.xilinx.com. 20 21 @cindex MicroBlaze support 22 @menu 23 * MicroBlaze Directives:: Directives for MicroBlaze Processors. 24 * MicroBlaze Syntax:: Syntax for the MicroBlaze 25 @end menu 26 27 @node MicroBlaze Directives 28 @section Directives 29 @cindex MicroBlaze directives 30 A number of assembler directives are available for MicroBlaze. 31 32 @table @code 33 @item .data8 @var{expression},... 34 This directive is an alias for @code{.byte}. Each expression is assembled 35 into an eight-bit value. 36 37 @item .data16 @var{expression},... 38 This directive is an alias for @code{.hword}. Each expression is assembled 39 into an 16-bit value. 40 41 @item .data32 @var{expression},... 42 This directive is an alias for @code{.word}. Each expression is assembled 43 into an 32-bit value. 44 45 @item .ent @var{name}[,@var{label}] 46 This directive is an alias for @code{.func} denoting the start of function 47 @var{name} at (optional) @var{label}. 48 49 @item .end @var{name}[,@var{label}] 50 This directive is an alias for @code{.endfunc} denoting the end of function 51 @var{name}. 52 53 @item .gpword @var{label},... 54 This directive is an alias for @code{.rva}. The resolved address of @var{label} 55 is stored in the data section. 56 57 @item .weakext @var{label} 58 Declare that @var{label} is a weak external symbol. 59 60 @item .rodata 61 Switch to .rodata section. Equivalent to @code{.section .rodata} 62 63 @item .sdata2 64 Switch to .sdata2 section. Equivalent to @code{.section .sdata2} 65 66 @item .sdata 67 Switch to .sdata section. Equivalent to @code{.section .sdata} 68 69 @item .bss 70 Switch to .bss section. Equivalent to @code{.section .bss} 71 72 @item .sbss 73 Switch to .sbss section. Equivalent to @code{.section .sbss} 74 @end table 75 76 @node MicroBlaze Syntax 77 @section Syntax for the MicroBlaze 78 @menu 79 * MicroBlaze-Chars:: Special Characters 80 @end menu 81 82 @node MicroBlaze-Chars 83 @subsection Special Characters 84 85 @cindex line comment character, MicroBlaze 86 @cindex MicroBlaze line comment character 87 The presence of a @samp{#} on a line indicates the start of a comment 88 that extends to the end of the current line. 89 90 If a @samp{#} appears as the first character of a line, the whole line 91 is treated as a comment, but in this case the line can also be a 92 logical line number directive (@pxref{Comments}) or a 93 preprocessor control command (@pxref{Preprocessing}). 94 95 @cindex line separator, MicroBlaze 96 @cindex statement separator, MicroBlaze 97 @cindex MicroBlaze line separator 98 The @samp{;} character can be used to separate statements on the same 99 line. 100
