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+@c Copyright 2008, 2009
+@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 RX-Dependent
+@chapter RX Dependent Features
+@end ifset
+@ifclear GENERIC
+@node Machine Dependencies
+@chapter RX Dependent Features
+@end ifclear
+
+@cindex RX support
+@menu
+* RX-Opts::                   RX Assembler Command Line Options
+* RX-Modifiers::              Symbolic Operand Modifiers
+* RX-Directives::             Assembler Directives
+* RX-Float::                  Floating Point
+@end menu
+
+@node RX-Opts
+@section RX Options
+@cindex options, RX
+@cindex RX options
+
+The Renesas RX port of @code{@value{AS}} has a few target specfic
+command line options:
+
+@table @code
+
+@cindex @samp{-m32bit-doubles}
+@item -m32bit-doubles
+This option controls the ABI and indicates to use a 32-bit float ABI.
+It has no effect on the assembled instructions, but it does influence
+the behaviour of the @samp{.double} pseudo-op.
+This is the default.
+
+@cindex @samp{-m64bit-doubles}
+@item -m64bit-doubles
+This option controls the ABI and indicates to use a 64-bit float ABI.
+It has no effect on the assembled instructions, but it does influence
+the behaviour of the @samp{.double} pseudo-op.
+
+@cindex @samp{-mbig-endian}
+@item -mbig-endian
+This option controls the ABI and indicates to use a big-endian data
+ABI.  It has no effect on the assembled instructions, but it does
+influence the behaviour of the @samp{.short}, @samp{.hword}, @samp{.int},
+@samp{.word}, @samp{.long}, @samp{.quad} and @samp{.octa} pseudo-ops.
+
+@cindex @samp{-mlittle-endian}
+@item -mlittle-endian
+This option controls the ABI and indicates to use a little-endian data
+ABI.  It has no effect on the assembled instructions, but it does
+influence the behaviour of the @samp{.short}, @samp{.hword}, @samp{.int},
+@samp{.word}, @samp{.long}, @samp{.quad} and @samp{.octa} pseudo-ops.
+This is the default.
+
+@cindex @samp{-muse-conventional-section-names}
+@item -muse-conventional-section-names
+This option controls the default names given to the code (.text),
+initialised data (.data) and uninitialised data sections (.bss).
+
+@cindex @samp{-muse-renesas-section-names}
+@item -muse-renesas-section-names
+This option controls the default names given to the code (.P),
+initialised data (.D_1) and uninitialised data sections (.B_1).
+This is the default.
+
+@cindex @samp{-msmall-data-limit}
+@item -msmall-data-limit
+This option tells the assembler that the small data limit feature of
+the RX port of GCC is being used.  This results in the assembler
+generating an undefined reference to a symbol called __gp for use by
+the relocations that are needed to support the small data limit
+feature.   This option is not enabled by default as it would otherwise
+pollute the symbol table.
+
+@end table
+
+@node RX-Modifiers
+@section Symbolic Operand Modifiers
+
+@cindex RX modifiers
+@cindex syntax, RX
+
+The assembler supports several modifiers when using symbol addresses
+in RX instruction operands.  The general syntax is the following:
+
+@smallexample
+%modifier(symbol)
+@end smallexample
+
+@table @code
+@cindex symbol modifiers
+
+@item %gp
+@c FIXME: Add documentation here.
+
+@end table
+
+@node RX-Directives
+@section Assembler Directives
+
+@cindex assembler directives, RX
+@cindex RX assembler directives
+
+The RX version of @code{@value{AS}} has the following specific
+assembler directives:
+
+@table @code
+
+@item .3byte
+@cindex assembler directive .3byte, RX
+@cindex RX assembler directive .3byte
+Inserts a 3-byte value into the output file at the current location.
+
+@end table
+
+@node RX-Float
+@section Floating Point
+
+@cindex floating point, RX
+@cindex RX floating point
+
+The floating point formats generated by directives are these.
+
+@table @code
+@cindex @code{float} directive, RX
+
+@item .float
+@code{Single} precision (32-bit) floating point constants.
+
+@cindex @code{double} directive, RX
+@item .double
+If the @option{-m64bit-doubles} command line option has been specified
+then then @code{double} directive generates @code{double} precision
+(64-bit) floating point constants, otherwise it generates
+@code{single} precision (32-bit) floating point constants.  To force
+the generation of 64-bit floating point constants used the @code{dc.d}
+directive instead.
+
+@end table