gas/doc/c-sh.texi

   1 @c Copyright (C) 1991, 92, 93, 94, 95, 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 @page
   5 @node SH-Dependent
   6 @chapter Hitachi SH Dependent Features
   7
   8 @cindex SH support
   9 @menu
  10 * SH Options::              Options
  11 * SH Syntax::               Syntax
  12 * SH Floating Point::       Floating Point
  13 * SH Directives::           SH Machine Directives
  14 * SH Opcodes::              Opcodes
  15 @end menu
  16
  17 @node SH Options
  18 @section Options
  19
  20 @cindex SH options (none)
  21 @cindex options, SH (none)
  22 @code{@value{AS}} has no additional command-line options for the Hitachi
  23 SH family.
  24
  25 @node SH Syntax
  26 @section Syntax
  27
  28 @menu
  29 * SH-Chars::                Special Characters
  30 * SH-Regs::                 Register Names
  31 * SH-Addressing::           Addressing Modes
  32 @end menu
  33
  34 @node SH-Chars
  35 @subsection Special Characters
  36
  37 @cindex line comment character, SH
  38 @cindex SH line comment character
  39 @samp{!} is the line comment character.
  40
  41 @cindex line separator, SH
  42 @cindex statement separator, SH
  43 @cindex SH line separator
  44 You can use @samp{;} instead of a newline to separate statements.
  45
  46 @cindex symbol names, @samp{$} in
  47 @cindex @code{$} in symbol names
  48 Since @samp{$} has no special meaning, you may use it in symbol names.
  49
  50 @node SH-Regs
  51 @subsection Register Names
  52
  53 @cindex SH registers
  54 @cindex registers, SH
  55 You can use the predefined symbols @samp{r0}, @samp{r1}, @samp{r2},
  56 @samp{r3}, @samp{r4}, @samp{r5}, @samp{r6}, @samp{r7}, @samp{r8},
  57 @samp{r9}, @samp{r10}, @samp{r11}, @samp{r12}, @samp{r13}, @samp{r14},
  58 and @samp{r15} to refer to the SH registers.
  59
  60 The SH also has these control registers:
  61
  62 @table @code
  63 @item pr
  64 procedure register (holds return address)
  65
  66 @item pc
  67 program counter
  68
  69 @item mach
  70 @itemx macl
  71 high and low multiply accumulator registers
  72
  73 @item sr
  74 status register
  75
  76 @item gbr
  77 global base register
  78
  79 @item vbr
  80 vector base register (for interrupt vectors)
  81 @end table
  82
  83 @node SH-Addressing
  84 @subsection Addressing Modes
  85
  86 @cindex addressing modes, SH
  87 @cindex SH addressing modes
  88 @code{@value{AS}} understands the following addressing modes for the SH.
  89 @code{R@var{n}} in the following refers to any of the numbered
  90 registers, but @emph{not} the control registers.
  91
  92 @table @code
  93 @item R@var{n}
  94 Register direct
  95
  96 @item @@R@var{n}
  97 Register indirect
  98
  99 @item @@-R@var{n}
 100 Register indirect with pre-decrement
 101
 102 @item @@R@var{n}+
 103 Register indirect with post-increment
 104
 105 @item @@(@var{disp}, R@var{n})
 106 Register indirect with displacement
 107
 108 @item @@(R0, R@var{n})
 109 Register indexed
 110
 111 @item @@(@var{disp}, GBR)
 112 @code{GBR} offset
 113
 114 @item @@(R0, GBR)
 115 GBR indexed
 116
 117 @item @var{addr}
 118 @itemx @@(@var{disp}, PC)
 119 PC relative address (for branch or for addressing memory).  The
 120 @code{@value{AS}} implementation allows you to use the simpler form
 121 @var{addr} anywhere a PC relative address is called for; the alternate
 122 form is supported for compatibility with other assemblers.
 123
 124 @item #@var{imm}
 125 Immediate data
 126 @end table
 127
 128 @node SH Floating Point
 129 @section Floating Point
 130
 131 @cindex floating point, SH (@sc{ieee})
 132 @cindex SH floating point (@sc{ieee})
 133 The SH family has no hardware floating point, but the @code{.float}
 134 directive generates @sc{ieee} floating-point numbers for compatibility
 135 with other development tools.
 136
 137 @node SH Directives
 138 @section SH Machine Directives
 139
 140 @cindex SH machine directives
 141 @cindex machine directives, SH
 142 @cindex @code{uaword} directive, SH
 143 @cindex @code{ualong} directive, SH
 144
 145 @table @code
 146 @item uaword
 147 @itemx ualong
 148 @code{@value{AS}} will issue a warning when a misaligned @code{.word} or
 149 @code{.long} directive is used.  You may use @code{.uaword} or
 150 @code{.ualong} to indicate that the value is intentionally misaligned.
 151 @end table
 152
 153 @node SH Opcodes
 154 @section Opcodes
 155
 156 @cindex SH opcode summary
 157 @cindex opcode summary, SH
 158 @cindex mnemonics, SH
 159 @cindex instruction summary, SH
 160 For detailed information on the SH machine instruction set, see
 161 @cite{SH-Microcomputer User's Manual} (Hitachi Micro Systems, Inc.).
 162
 163 @code{@value{AS}} implements all the standard SH opcodes.  No additional
 164 pseudo-instructions are needed on this family.  Note, however, that
 165 because @code{@value{AS}} supports a simpler form of PC-relative
 166 addressing, you may simply write (for example)
 167
 168 @example
 169 mov.l  bar,r0
 170 @end example
 171
 172 @noindent
 173 where other assemblers might require an explicit displacement to
 174 @code{bar} from the program counter:
 175
 176 @example
 177 mov.l  @@(@var{disp}, PC)
 178 @end example
 179
 180 @ifset SMALL
 181 @c this table, due to the multi-col faking and hardcoded order, looks silly
 182 @c except in smallbook.  See comments below "@set SMALL" near top of this file.
 183
 184 Here is a summary of SH opcodes:
 185
 186 @page
 187 @smallexample
 188 @i{Legend:}
 189 Rn        @r{a numbered register}
 190 Rm        @r{another numbered register}
 191 #imm      @r{immediate data}
 192 disp      @r{displacement}
 193 disp8     @r{8-bit displacement}
 194 disp12    @r{12-bit displacement}
 195
 196 add #imm,Rn                    lds.l @@Rn+,PR
 197 add Rm,Rn                      mac.w @@Rm+,@@Rn+
 198 addc Rm,Rn                     mov #imm,Rn
 199 addv Rm,Rn                     mov Rm,Rn
 200 and #imm,R0                    mov.b Rm,@@(R0,Rn)
 201 and Rm,Rn                      mov.b Rm,@@-Rn
 202 and.b #imm,@@(R0,GBR)           mov.b Rm,@@Rn
 203 bf disp8                       mov.b @@(disp,Rm),R0
 204 bra disp12                     mov.b @@(disp,GBR),R0
 205 bsr disp12                     mov.b @@(R0,Rm),Rn
 206 bt disp8                       mov.b @@Rm+,Rn
 207 clrmac                         mov.b @@Rm,Rn
 208 clrt                           mov.b R0,@@(disp,Rm)
 209 cmp/eq #imm,R0                 mov.b R0,@@(disp,GBR)
 210 cmp/eq Rm,Rn                   mov.l Rm,@@(disp,Rn)
 211 cmp/ge Rm,Rn                   mov.l Rm,@@(R0,Rn)
 212 cmp/gt Rm,Rn                   mov.l Rm,@@-Rn
 213 cmp/hi Rm,Rn                   mov.l Rm,@@Rn
 214 cmp/hs Rm,Rn                   mov.l @@(disp,Rn),Rm
 215 cmp/pl Rn                      mov.l @@(disp,GBR),R0
 216 cmp/pz Rn                      mov.l @@(disp,PC),Rn
 217 cmp/str Rm,Rn                  mov.l @@(R0,Rm),Rn
 218 div0s Rm,Rn                    mov.l @@Rm+,Rn
 219 div0u                          mov.l @@Rm,Rn
 220 div1 Rm,Rn                     mov.l R0,@@(disp,GBR)
 221 exts.b Rm,Rn                   mov.w Rm,@@(R0,Rn)
 222 exts.w Rm,Rn                   mov.w Rm,@@-Rn
 223 extu.b Rm,Rn                   mov.w Rm,@@Rn
 224 extu.w Rm,Rn                   mov.w @@(disp,Rm),R0
 225 jmp @@Rn                        mov.w @@(disp,GBR),R0
 226 jsr @@Rn                        mov.w @@(disp,PC),Rn
 227 ldc Rn,GBR                     mov.w @@(R0,Rm),Rn
 228 ldc Rn,SR                      mov.w @@Rm+,Rn
 229 ldc Rn,VBR                     mov.w @@Rm,Rn
 230 ldc.l @@Rn+,GBR                 mov.w R0,@@(disp,Rm)
 231 ldc.l @@Rn+,SR                  mov.w R0,@@(disp,GBR)
 232 ldc.l @@Rn+,VBR                 mova @@(disp,PC),R0
 233 lds Rn,MACH                    movt Rn
 234 lds Rn,MACL                    muls Rm,Rn
 235 lds Rn,PR                      mulu Rm,Rn
 236 lds.l @@Rn+,MACH                neg Rm,Rn
 237 lds.l @@Rn+,MACL                negc Rm,Rn
 238 @page
 239 nop                            stc VBR,Rn
 240 not Rm,Rn                      stc.l GBR,@@-Rn
 241 or #imm,R0                     stc.l SR,@@-Rn
 242 or Rm,Rn                       stc.l VBR,@@-Rn
 243 or.b #imm,@@(R0,GBR)            sts MACH,Rn
 244 rotcl Rn                       sts MACL,Rn
 245 rotcr Rn                       sts PR,Rn
 246 rotl Rn                        sts.l MACH,@@-Rn
 247 rotr Rn                        sts.l MACL,@@-Rn
 248 rte                            sts.l PR,@@-Rn
 249 rts                            sub Rm,Rn
 250 sett                           subc Rm,Rn
 251 shal Rn                        subv Rm,Rn
 252 shar Rn                        swap.b Rm,Rn
 253 shll Rn                        swap.w Rm,Rn
 254 shll16 Rn                      tas.b @@Rn
 255 shll2 Rn                       trapa #imm
 256 shll8 Rn                       tst #imm,R0
 257 shlr Rn                        tst Rm,Rn
 258 shlr16 Rn                      tst.b #imm,@@(R0,GBR)
 259 shlr2 Rn                       xor #imm,R0
 260 shlr8 Rn                       xor Rm,Rn
 261 sleep                          xor.b #imm,@@(R0,GBR)
 262 stc GBR,Rn                     xtrct Rm,Rn
 263 stc SR,Rn
 264 @end smallexample
 265 @end ifset
 266
 267 @ifset Hitachi-all
 268 @ifclear GENERIC
 269 @raisesections
 270 @end ifclear
 271 @end ifset
 272