gas/doc/c-msp430.texi

   1 @c Copyright 2002 Free Software Foundation, Inc.
   2 @c This is part of the GAS manual.
   3 @c For copying conditions, see the file as.texinfo.
   4 @ifset GENERIC
   5 @page
   6 @node MSP430-Dependent
   7 @chapter MSP 430 Dependent Features
   8 @end ifset
   9 @ifclear GENERIC
  10 @node Machine Dependencies
  11 @chapter MSP 430 Dependent Features
  12 @end ifclear
  13
  14 @cindex MSP 430 support
  15 @cindex 430 support
  16 @menu
  17 * MSP430 Options::              Options
  18 * MSP430 Syntax::               Syntax
  19 * MSP430 Floating Point::       Floating Point
  20 * MSP430 Directives::           MSP 430 Machine Directives
  21 * MSP430 Opcodes::              Opcodes
  22 @end menu
  23
  24 @node MSP430 Options
  25 @section Options
  26 @cindex MSP 430 options (none)
  27 @cindex options for MSP430 (none)
  28 @code{@value{AS}} has only -m flag which selects the mpu arch. Currently has
  29 no effect.
  30
  31 @node MSP430 Syntax
  32 @section Syntax
  33 @menu
  34 * MSP430-Macros::               Macros
  35 * MSP430-Chars::                Special Characters
  36 * MSP430-Regs::                 Register Names
  37 * MSP430-Ext::                  Assembler Extensions
  38 @end menu
  39
  40 @node MSP430-Macros
  41 @subsection Macros
  42
  43 @cindex Macros, MSP 430
  44 @cindex MSP 430 macros
  45 The macro syntax used on the MSP 430 is like that described in the MSP
  46 430 Family Assembler Specification.  Normal @code{@value{AS}}
  47 macros should still work.
  48
  49 Additional built-in macros are:
  50
  51 @table @code
  52
  53 @item llo(exp)
  54 Extracts least significant word from 32-bit expression 'exp'.
  55
  56 @item lhi(exp)
  57 Extracts most significant word from 32-bit expression 'exp'.
  58
  59 @item hlo(exp)
  60 Extracts 3rd word from 64-bit expression 'exp'.
  61
  62 @item   hhi(exp)
  63 Extracts 4rd word from 64-bit expression 'exp'.
  64
  65 @end table
  66
  67 They normally being used as an immediate source operand.
  68 @smallexample
  69     mov #llo(1), r10    ;       == mov  #1, r10
  70     mov #lhi(1), r10    ;       == mov  #0, r10
  71 @end smallexample
  72
  73 @node MSP430-Chars
  74 @subsection Special Characters
  75
  76 @cindex line comment character, MSP 430
  77 @cindex MSP 430 line comment character
  78 @samp{;} is the line comment character.
  79
  80 @cindex identifiers, MSP 430
  81 @cindex MSP 430 identifiers
  82 The character @samp{$} in jump instructions indicates current location and
  83 implemented only for TI syntax compatibility.
  84
  85 @node MSP430-Regs
  86 @subsection Register Names
  87
  88 @cindex MSP 430 register names
  89 @cindex register names, MSP 430
  90 General-purpose registers are represented by predefined symbols of the
  91 form @samp{r@var{N}} (for global registers), where @var{N} represents
  92 a number between @code{0} and @code{15}.  The leading
  93 letters may be in either upper or lower case; for example, @samp{r13}
  94 and @samp{R7} are both valid register names.
  95
  96 @cindex special purpose registers, MSP 430
  97 Register names @samp{PC}, @samp{SP} and @samp{SR} cannot be used as register names
  98 and will be treated as variables. Use @samp{r0}, @samp{r1}, and @samp{r2} instead.
  99
 100
 101 @node MSP430-Ext
 102 @subsection Assembler Extensions
 103 @cindex MSP430 Assembler Extensions
 104
 105 @table @code
 106
 107 @item @@rN
 108 As destination operand being treated as @samp{0(rn)}
 109
 110 @item 0(rN)
 111 As source operand being treated as @samp{@@rn}
 112
 113 @item jCOND +N
 114 Skips next N bytes followed by jump instruction and equivalent to
 115 @samp{jCOND $+N+2}
 116
 117 @end table
 118
 119
 120 @node MSP430 Floating Point
 121 @section Floating Point
 122
 123 @cindex floating point, MSP 430 (@sc{ieee})
 124 @cindex MSP 430 floating point (@sc{ieee})
 125 The MSP 430 family uses @sc{ieee} 32-bit floating-point numbers.
 126
 127 @node MSP430 Directives
 128 @section MSP 430 Machine Directives
 129
 130 @cindex machine directives, MSP 430
 131 @cindex MSP 430 machine directives
 132 @table @code
 133 @cindex @code{file} directive, MSP 430
 134 @item .file
 135 This directive is ignored; it is accepted for compatibility with other
 136 MSP 430 assemblers.
 137
 138 @quotation
 139 @emph{Warning:} in other versions of the @sc{gnu} assembler, @code{.file} is
 140 used for the directive called @code{.app-file} in the MSP 430 support.
 141 @end quotation
 142
 143 @cindex @code{line} directive, MSP 430
 144 @item .line
 145 This directive is ignored; it is accepted for compatibility with other
 146 MSP 430 assemblers.
 147
 148 @cindex @code{sect} directive, MSP 430
 149 @item .arch
 150 Currently this directive is ignored; it is accepted for compatibility with other
 151 MSP 430 assemblers.
 152
 153 @end table
 154
 155 @node MSP430 Opcodes
 156 @section Opcodes
 157
 158 @cindex MSP 430 opcodes
 159 @cindex opcodes for MSP 430
 160 @code{@value{AS}} implements all the standard MSP 430 opcodes.  No
 161 additional pseudo-instructions are needed on this family.
 162
 163 For information on the 430 machine instruction set, see @cite{MSP430
 164 User's Manual, document slau049b}, Texas Instrument, Inc.