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@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.