Add support for msp430.

gas/doc/c-msp430.texi

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+@c Copyright 2002 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 MSP430-Dependent
+@chapter MSP 430 Dependent Features
+@end ifset
+@ifclear GENERIC
+@node Machine Dependencies
+@chapter MSP 430 Dependent Features
+@end ifclear
+
+@cindex MSP 430 support
+@cindex 430 support
+@menu
+* MSP430 Options::              Options
+* MSP430 Syntax::               Syntax
+* MSP430 Floating Point::       Floating Point
+* MSP430 Directives::           MSP 430 Machine Directives
+* MSP430 Opcodes::              Opcodes
+@end menu
+
+@node MSP430 Options
+@section Options
+@cindex MSP 430 options (none)
+@cindex options for MSP430 (none)
+@code{@value{AS}} has only -m flag which selects the mpu arch. Currently has 
+no effect.
+
+@node MSP430 Syntax
+@section Syntax
+@menu
+* MSP430-Macros::		Macros
+* MSP430-Chars::                Special Characters
+* MSP430-Regs::                 Register Names
+* MSP430-Ext::			Assembler Extensions
+@end menu
+
+@node MSP430-Macros
+@subsection Macros
+
+@cindex Macros, MSP 430
+@cindex MSP 430 macros
+The macro syntax used on the MSP 430 is like that described in the MSP
+430 Family Assembler Specification.  Normal @code{@value{AS}}
+macros should still work.
+
+Additional built-in macros are:
+
+@table @code
+
+@item llo(exp) 
+Extracts least significant word from 32-bit expression 'exp'.
+
+@item lhi(exp)
+Extracts most significant word from 32-bit expression 'exp'.
+
+@item hlo(exp)
+Extracts 3rd word from 64-bit expression 'exp'.
+
+@item 	hhi(exp) 
+Extracts 4rd word from 64-bit expression 'exp'.
+
+@end table
+
+They normally being used as an immediate source operand.
+@smallexample
+    mov	#llo(1), r10	;	== mov	#1, r10	
+    mov	#lhi(1), r10	;	== mov	#0, r10
+@end smallexample
+	
+@node MSP430-Chars
+@subsection Special Characters
+
+@cindex line comment character, MSP 430
+@cindex MSP 430 line comment character
+@samp{;} is the line comment character.
+
+@cindex identifiers, MSP 430
+@cindex MSP 430 identifiers
+The character @samp{$} in jump instructions indicates current location and 
+implemented only for TI syntax compatibility.
+
+@node MSP430-Regs
+@subsection Register Names
+
+@cindex MSP 430 register names
+@cindex register names, MSP 430
+General-purpose registers are represented by predefined symbols of the
+form @samp{r@var{N}} (for global registers), where @var{N} represents
+a number between @code{0} and @code{15}.  The leading
+letters may be in either upper or lower case; for example, @samp{r13}
+and @samp{R7} are both valid register names.
+
+@cindex special purpose registers, MSP 430
+Register names @samp{PC}, @samp{SP} and @samp{SR} cannot be used as register names
+and will be treated as variables. Use @samp{r0}, @samp{r1}, and @samp{r2} instead.
+
+
+@node MSP430-Ext
+@subsection Assembler Extensions
+@cindex MSP430 Assembler Extensions
+
+@table @code
+
+@item @@rN
+As destination operand being treated as @samp{0(rn)}
+
+@item 0(rN)
+As source operand being treated as @samp{@@rn}
+
+@item jCOND +N
+Skips next N bytes followed by jump instruction and equivalent to
+@samp{jCOND $+N+2}
+
+@end table
+
+
+@node MSP430 Floating Point
+@section Floating Point
+
+@cindex floating point, MSP 430 (@sc{ieee})
+@cindex MSP 430 floating point (@sc{ieee})
+The MSP 430 family uses @sc{ieee} 32-bit floating-point numbers.
+
+@node MSP430 Directives
+@section MSP 430 Machine Directives
+
+@cindex machine directives, MSP 430
+@cindex MSP 430 machine directives
+@table @code
+@cindex @code{file} directive, MSP 430
+@item .file
+This directive is ignored; it is accepted for compatibility with other
+MSP 430 assemblers.
+
+@quotation
+@emph{Warning:} in other versions of the @sc{gnu} assembler, @code{.file} is
+used for the directive called @code{.app-file} in the MSP 430 support.
+@end quotation
+
+@cindex @code{line} directive, MSP 430
+@item .line
+This directive is ignored; it is accepted for compatibility with other
+MSP 430 assemblers.
+
+@cindex @code{sect} directive, MSP 430
+@item .arch
+Currently this directive is ignored; it is accepted for compatibility with other
+MSP 430 assemblers.
+
+@end table
+
+@node MSP430 Opcodes
+@section Opcodes
+
+@cindex MSP 430 opcodes
+@cindex opcodes for MSP 430
+@code{@value{AS}} implements all the standard MSP 430 opcodes.  No
+additional pseudo-instructions are needed on this family.
+
+For information on the 430 machine instruction set, see @cite{MSP430
+User's Manual, document slau049b}, Texas Instrument, Inc.