| 1 | @c Copyright (C) 2011-2015 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 RL78-Dependent |
| 7 | @chapter RL78 Dependent Features |
| 8 | @end ifset |
| 9 | @ifclear GENERIC |
| 10 | @node Machine Dependencies |
| 11 | @chapter RL78 Dependent Features |
| 12 | @end ifclear |
| 13 | |
| 14 | @cindex RL78 support |
| 15 | @menu |
| 16 | * RL78-Opts:: RL78 Assembler Command Line Options |
| 17 | * RL78-Modifiers:: Symbolic Operand Modifiers |
| 18 | * RL78-Directives:: Assembler Directives |
| 19 | * RL78-Syntax:: Syntax |
| 20 | @end menu |
| 21 | |
| 22 | @node RL78-Opts |
| 23 | @section RL78 Options |
| 24 | @cindex options, RL78 |
| 25 | @cindex RL78 options |
| 26 | |
| 27 | @table @code |
| 28 | @item relax |
| 29 | Enable support for link-time relaxation. |
| 30 | |
| 31 | @item mg10 |
| 32 | Mark the generated binary as targeting the G10 variant of the RL78 |
| 33 | architecture. |
| 34 | |
| 35 | @item m32bit-doubles |
| 36 | Mark the generated binary as one that uses 32-bits to hold the |
| 37 | @code{double} floating point type. This is the default. |
| 38 | |
| 39 | @item m64bit-doubles |
| 40 | Mark the generated binary as one that uses 64-bits to hold the |
| 41 | @code{double} floating point type. |
| 42 | |
| 43 | @end table |
| 44 | |
| 45 | @node RL78-Modifiers |
| 46 | @section Symbolic Operand Modifiers |
| 47 | |
| 48 | @cindex RL78 modifiers |
| 49 | @cindex syntax, RL78 |
| 50 | |
| 51 | The RL78 has three modifiers that adjust the relocations used by the |
| 52 | linker: |
| 53 | |
| 54 | @table @code |
| 55 | |
| 56 | @item %lo16() |
| 57 | |
| 58 | When loading a 20-bit (or wider) address into registers, this modifier |
| 59 | selects the 16 least significant bits. |
| 60 | |
| 61 | @smallexample |
| 62 | movw ax,#%lo16(_sym) |
| 63 | @end smallexample |
| 64 | |
| 65 | @item %hi16() |
| 66 | |
| 67 | When loading a 20-bit (or wider) address into registers, this modifier |
| 68 | selects the 16 most significant bits. |
| 69 | |
| 70 | @smallexample |
| 71 | movw ax,#%hi16(_sym) |
| 72 | @end smallexample |
| 73 | |
| 74 | @item %hi8() |
| 75 | |
| 76 | When loading a 20-bit (or wider) address into registers, this modifier |
| 77 | selects the 8 bits that would go into CS or ES (i.e. bits 23..16). |
| 78 | |
| 79 | @smallexample |
| 80 | mov es, #%hi8(_sym) |
| 81 | @end smallexample |
| 82 | |
| 83 | @end table |
| 84 | |
| 85 | @node RL78-Directives |
| 86 | @section Assembler Directives |
| 87 | |
| 88 | @cindex assembler directives, RL78 |
| 89 | @cindex RL78 assembler directives |
| 90 | |
| 91 | In addition to the common directives, the RL78 adds these: |
| 92 | |
| 93 | @table @code |
| 94 | |
| 95 | @item .double |
| 96 | Output a constant in ``double'' format, which is either a 32-bit |
| 97 | or a 64-bit floating point value, depending upon the setting of the |
| 98 | @option{-m32bit-doubles}|@option{-m64bit-doubles} command line |
| 99 | option. |
| 100 | |
| 101 | @item .bss |
| 102 | Select the BSS section. |
| 103 | |
| 104 | @item .3byte |
| 105 | Output a constant value in a three byte format. |
| 106 | |
| 107 | @item .int |
| 108 | @itemx .word |
| 109 | Output a constant value in a four byte format. |
| 110 | |
| 111 | @end table |
| 112 | |
| 113 | @node RL78-Syntax |
| 114 | @section Syntax for the RL78 |
| 115 | @menu |
| 116 | * RL78-Chars:: Special Characters |
| 117 | @end menu |
| 118 | |
| 119 | @node RL78-Chars |
| 120 | @subsection Special Characters |
| 121 | |
| 122 | @cindex line comment character, RL78 |
| 123 | @cindex RL78 line comment character |
| 124 | The presence of a @samp{;} appearing anywhere on a line indicates the |
| 125 | start of a comment that extends to the end of that line. |
| 126 | |
| 127 | If a @samp{#} appears as the first character of a line then the whole |
| 128 | line is treated as a comment, but in this case the line can also be a |
| 129 | logical line number directive (@pxref{Comments}) or a preprocessor |
| 130 | control command (@pxref{Preprocessing}). |
| 131 | |
| 132 | @cindex line separator, RL78 |
| 133 | @cindex statement separator, RL78 |
| 134 | @cindex RL78 line separator |
| 135 | The @samp{|} character can be used to separate statements on the same |
| 136 | line. |