| @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. |