| @c Copyright 2011 |
| @c Free Software Foundation, Inc. |
| @c This is part of the GAS manual. |
| @c For copying conditions, see the file as.texinfo. |
| @ifset GENERIC |
| @page |
| @node RL78-Dependent |
| @chapter RL78 Dependent Features |
| @end ifset |
| @ifclear GENERIC |
| @node Machine Dependencies |
| @chapter RL78 Dependent Features |
| @end ifclear |
| |
| @cindex RL78 support |
| @menu |
| * RL78-Opts:: RL78 Assembler Command Line Options |
| * RL78-Modifiers:: Symbolic Operand Modifiers |
| * RL78-Directives:: Assembler Directives |
| * RL78-Syntax:: Syntax |
| @end menu |
| |
| @node RL78-Opts |
| @section RL78 Options |
| @cindex options, RL78 |
| @cindex RL78 options |
| |
| The Renesas RL78 port of @code{@value{AS}} has no target-specific |
| options. |
| |
| @node RL78-Modifiers |
| @section Symbolic Operand Modifiers |
| |
| @cindex RL78 modifiers |
| @cindex syntax, RL78 |
| |
| The RL78 has three modifiers that adjust the relocations used by the |
| linker: |
| |
| @table @code |
| |
| @item %lo16() |
| |
| When loading a 20-bit (or wider) address into registers, this modifier |
| selects the 16 least significant bits. |
| |
| @smallexample |
| movw ax,#%lo16(_sym) |
| @end smallexample |
| |
| @item %hi16() |
| |
| When loading a 20-bit (or wider) address into registers, this modifier |
| selects the 16 most significant bits. |
| |
| @smallexample |
| movw ax,#%hi16(_sym) |
| @end smallexample |
| |
| @item %hi8() |
| |
| When loading a 20-bit (or wider) address into registers, this modifier |
| selects the 8 bits that would go into CS or ES (i.e. bits 23..16). |
| |
| @smallexample |
| mov es, #%hi8(_sym) |
| @end smallexample |
| |
| @end table |
| |
| @node RL78-Directives |
| @section Assembler Directives |
| |
| @cindex assembler directives, RL78 |
| @cindex RL78 assembler directives |
| |
| In addition to the common directives, the RL78 adds these: |
| |
| @table @code |
| |
| @item .double |
| Output a constant in ``double'' format, which is a 32-bit floating |
| point value on RL78. |
| |
| @item .bss |
| Select the BSS section. |
| |
| @item .3byte |
| Output a constant value in a three byte format. |
| |
| @item .int |
| @itemx .word |
| Output a constant value in a four byte format. |
| |
| @end table |
| |
| @node RL78-Syntax |
| @section Syntax for the RL78 |
| @menu |
| * RL78-Chars:: Special Characters |
| @end menu |
| |
| @node RL78-Chars |
| @subsection Special Characters |
| |
| @cindex line comment character, RL78 |
| @cindex RL78 line comment character |
| The presence of a @samp{;} appearing anywhere on a line indicates the |
| start of a comment that extends to the end of that line. |
| |
| If a @samp{#} appears as the first character of a line then the whole |
| line is treated as a comment, but in this case the line can also be a |
| logical line number directive (@pxref{Comments}) or a preprocessor |
| control command (@pxref{Preprocessing}). |
| |
| @cindex line separator, RL78 |
| @cindex statement separator, RL78 |
| @cindex RL78 line separator |
| The @samp{|} character can be used to separate statements on the same |
| line. |