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