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