gas/doc/c-v850.texi

   1 @c Copyright (C) 1997 Free Software Foundation, Inc.
   2 @c This is part of the GAS manual.
   3 @c For copying conditions, see the file as.texinfo.
   4
   5 @node Machine Dependencies
   6 @chapter v850 Dependent Features
   7
   8 @cindex V850 support
   9 @menu
  10 * V850 Options::              Options
  11 * V850 Syntax::               Syntax
  12 * V850 Floating Point::       Floating Point
  13 * V850 Directives::           V850 Machine Directives
  14 * V850 Opcodes::              Opcodes
  15 @end menu
  16
  17 @node V850 Options
  18 @section Options
  19 @cindex V850 options (none)
  20 @cindex options for V850 (none)
  21 @code{@value{AS}} has no additional command-line options for the V850
  22 processor family.
  23
  24 @node V850 Syntax
  25 @section Syntax
  26 @menu
  27 * V850-Chars::                Special Characters
  28 * V850-Regs::                 Register Names
  29 @end menu
  30
  31 @node V850-Chars
  32 @subsection Special Characters
  33
  34 @cindex line comment character, V850
  35 @cindex V850 line comment character
  36 @samp{#} is the line comment character.
  37 @node V850-Regs
  38 @subsection Register Names
  39
  40 @cindex V850 register names
  41 @cindex register names, V850
  42 @code{@value{AS}} supports the following names for registers:
  43 @table @code
  44 @cindex @code{zero} register, V850
  45 @item general register 0
  46 r0, zero
  47 @item general register 1
  48 r1
  49 @item general register 2
  50 r2
  51 @cindex @code{sp} register, V850
  52 @item general register 3
  53 r3, sp
  54 @cindex @code{gp} register, V850
  55 @item general register 4
  56 r4, gp
  57 @cindex @code{tp} register, V850
  58 @item general register 5
  59 r5, tp
  60 @item general register 6
  61 r6
  62 @item general register 7
  63 r7
  64 @item general register 8
  65 r8
  66 @item general register 9
  67 r9
  68 @item general register 10
  69 r10
  70 @item general register 11
  71 r11
  72 @item general register 12
  73 r12
  74 @item general register 13
  75 r13
  76 @item general register 14
  77 r14
  78 @item general register 15
  79 r15
  80 @item general register 16
  81 r16
  82 @item general register 17
  83 r17
  84 @item general register 18
  85 r18
  86 @item general register 19
  87 r19
  88 @item general register 20
  89 r20
  90 @item general register 21
  91 r21
  92 @item general register 22
  93 r22
  94 @item general register 23
  95 r23
  96 @item general register 24
  97 r24
  98 @item general register 25
  99 r25
 100 @item general register 26
 101 r26
 102 @item general register 27
 103 r27
 104 @item general register 28
 105 r28
 106 @item general register 29
 107 r29
 108 @cindex @code{ep} register, V850
 109 @item general register 30
 110 r30, ep
 111 @cindex @code{lp} register, V850
 112 @item general register 31
 113 r31, lp
 114 @cindex @code{eipc} register, V850
 115 @item system register 0
 116 eipc
 117 @cindex @code{eipsw} register, V850
 118 @item system register 1
 119 eipsw
 120 @cindex @code{fepc} register, V850
 121 @item system register 2
 122 fepc
 123 @cindex @code{fepsw} register, V850
 124 @item system register 3
 125 fepsw
 126 @cindex @code{ecr} register, V850
 127 @item system register 4
 128 ecr
 129 @cindex @code{psw} register, V850
 130 @item system register 5
 131 psw
 132 @c start-santize-v850e
 133 @cindex @code{ctpc} register, V850
 134 @item system register 16
 135 ctpc
 136 @cindex @code{ctpsw} register, V850
 137 @item system register 17
 138 ctpsw
 139 @cindex @code{dbpc} register, V850
 140 @item system register 18
 141 dbpc
 142 @cindex @code{dbpsw} register, V850
 143 @item system register 19
 144 dbpsw
 145 @cindex @code{ctbp} register, V850
 146 @item system register 20
 147 ctbp
 148 @c end-santize-v850e
 149 @end table
 150
 151 @node V850 Floating Point
 152 @section Floating Point
 153
 154 @cindex floating point, V850 (@sc{ieee})
 155 @cindex V850 floating point (@sc{ieee})
 156 The V850 family uses @sc{ieee} floating-point numbers.
 157
 158 @node V850 Directives
 159 @section V850 Machine Directives
 160
 161 @cindex machine directives, V850
 162 @cindex V850 machine directives
 163 @table @code
 164 @cindex @code{offset} directive, V850
 165 @item .offset @var{<expression>}
 166 Moves the offset into the current section to the specified amount.
 167
 168 @cindex @code{section} directive, V850
 169 @item .section "name", <type>
 170 This is an extension to the standard .section directive.  It sets the
 171 current section to be <type> and creates an alias for this section
 172 called "name".
 173
 174 @end table
 175
 176 @node V850 Opcodes
 177 @section Opcodes
 178
 179 @cindex V850 opcodes
 180 @cindex opcodes for V850
 181 @code{@value{AS}} implements all the standard V850 opcodes.
 182
 183 @code{@value{AS}} also implements the following pseudo ops:
 184
 185 @table @code
 186
 187 @cindex @code{hi} pseudo-op, V850
 188 @item hi()
 189 Computes the higher 16 bits of the given expression and stores it into
 190 the immediate operand field of the given instruction.  For example:
 191
 192     @samp{mulhi hi(here - there), r5, r6}
 193
 194 computes the difference between the address of labels 'here' and
 195 'there', takes the upper 16 bits of this difference, shifts it down 16
 196 bits and then mutliplies it by the lower 16 bits in register 5, putting
 197 the result into register 6.
 198
 199
 200 @cindex @code{lo} pseudo-op, V850
 201 @item lo()
 202 Computes the lower 16 bits of the given expression and stores it into
 203 the immediate operand field of the given instruction.  For example:
 204
 205     @samp{addi lo(here - there), r5, r6}
 206
 207 computes the difference between the address of labels 'here' and
 208 'there', takes the lower 16 bits of this difference and adds it to
 209 register 5, putting the result into register 6.
 210
 211 @cindex @code{sdaoff} pseudo-op, V850
 212 @item sdaoff()
 213 Computes the offset of the named variable from the start of the Small
 214 Data Area (whoes address is held in register 4, the GP register) and
 215 stores the result as a 16 bit signed value in the immediate operand
 216 field of the given instruction.  For example:
 217
 218       @samp{ld.w sdaoff(_a_variable)[gp],r6}
 219
 220 loads the contents of the location pointed to by the label '_a_variable'
 221 into register 6, provided that the label is located somewhere within +/-
 222 32K of the address held in the GP register.  [Note the linker assumes
 223 that the GP register contains a fixed address set to the address of the
 224 label called '__gp'].
 225
 226 @cindex @code{tdaoff} pseudo-op, V850
 227 @item tdaoff()
 228 Computes the offset of the named variable from the start of the Tiny
 229 Data Area (whoes address is held in register 30, the EP register) and
 230 stores the result as a 4,5,7 or 8 bit unsigned value in the immediate
 231 operand field of the given instruction.  For example:
 232
 233       @samp{sld.w tdaoff(_a_variable)[ep],r6}
 234
 235 loads the contents of the location pointed to by the label '_a_variable'
 236 into register 6, provided that the label is located somewhere within 256
 237 bytes of the address held in the EP register.  [Note the linker assumes
 238 that the EP register contains a fixed address set to the address of the
 239 label called '--ep'].
 240
 241 @cindex @code{zdaoff} pseudo-op, V850
 242 @item zdaoff()
 243 Computes the offset of the named variable from address 0 and stores the
 244 result as a 16 bit signed value in the immediate operand field of the
 245 given instruction.  For example:
 246
 247       @samp{movea zdaoff(_a_variable),zero,r6}
 248
 249 puts the address of the label '_a_variable' into register 6, assuming
 250 that the label is somewhere within the first 32K of memory.
 251
 252 @end table
 253
 254
 255 For information on the V850 or Thumb instruction sets, see @cite{V850
 256 Family 32-/16-Bit single-Chip Microcontroller Architecture Manual} from NEC.
 257 Ltd.
 258