projects / deliverable / binutils-gdb.git / blame
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1 | @c Copyright 2009 |
| 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 | @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 |