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@c Copyright (C) 1991, 1992, 1993, 1994, 1995, 2003, 2008

@c Free Software Foundation, Inc.

@c This is part of the GAS manual.

@c For copying conditions, see the file as.texinfo.

@ifset GENERIC

@page

@end ifset

@node H8/300-Dependent

@chapter H8/300 Dependent Features

@cindex H8/300 support

@menu

* H8/300 Options::              Options

* H8/300 Syntax::               Syntax

* H8/300 Floating Point::       Floating Point

* H8/300 Directives::           H8/300 Machine Directives

* H8/300 Opcodes::              Opcodes

@end menu

@node H8/300 Options

@section Options

@cindex H8/300 options

@cindex options, H8/300

The Renesas H8/300 version of @code{@value{AS}} has one

machine-dependent option:

@table @code

@item -h-tick-hex

Support H'00 style hex constants in addition to 0x00 style.

@end table

@node H8/300 Syntax

@section Syntax

@menu

* H8/300-Chars::                Special Characters

* H8/300-Regs::                 Register Names

* H8/300-Addressing::           Addressing Modes

@end menu

@node H8/300-Chars

@subsection Special Characters

@cindex line comment character, H8/300

@cindex H8/300 line comment character

@samp{;} is the line comment character.

@cindex line separator, H8/300

@cindex statement separator, H8/300

@cindex H8/300 line separator

@samp{$} can be used instead of a newline to separate statements.

Therefore @emph{you may not use @samp{$} in symbol names} on the H8/300.

@node H8/300-Regs

@subsection Register Names

@cindex H8/300 registers

@cindex register names, H8/300

You can use predefined symbols of the form @samp{r@var{n}h} and

@samp{r@var{n}l} to refer to the H8/300 registers as sixteen 8-bit

general-purpose registers.  @var{n} is a digit from @samp{0} to

@samp{7}); for instance, both @samp{r0h} and @samp{r7l} are valid

register names.

You can also use the eight predefined symbols @samp{r@var{n}} to refer

to the H8/300 registers as 16-bit registers (you must use this form for

addressing).

On the H8/300H, you can also use the eight predefined symbols

@samp{er@var{n}} (@samp{er0} @dots{} @samp{er7}) to refer to the 32-bit

general purpose registers.

The two control registers are called @code{pc} (program counter; a

16-bit register, except on the H8/300H where it is 24 bits) and

@code{ccr} (condition code register; an 8-bit register).  @code{r7} is

used as the stack pointer, and can also be called @code{sp}.

@node H8/300-Addressing

@subsection Addressing Modes

@cindex addressing modes, H8/300

@cindex H8/300 addressing modes

@value{AS} understands the following addressing modes for the H8/300:

@table @code

@item r@var{n}

Register direct

@item @@r@var{n}

Register indirect

@need 1200

@item @@(@var{d}, r@var{n})

@itemx @@(@var{d}:16, r@var{n})

@itemx @@(@var{d}:24, r@var{n})

Register indirect: 16-bit or 24-bit displacement @var{d} from register

@var{n}.  (24-bit displacements are only meaningful on the H8/300H.)

@item @@r@var{n}+

Register indirect with post-increment

@item @@-r@var{n}

Register indirect with pre-decrement

@item @code{@@}@var{aa}

@itemx @code{@@}@var{aa}:8

@itemx @code{@@}@var{aa}:16

@itemx @code{@@}@var{aa}:24

Absolute address @code{aa}.  (The address size @samp{:24} only makes

sense on the H8/300H.)

@item #@var{xx}

@itemx #@var{xx}:8

@itemx #@var{xx}:16

@itemx #@var{xx}:32

Immediate data @var{xx}.  You may specify the @samp{:8}, @samp{:16}, or

@samp{:32} for clarity, if you wish; but @code{@value{AS}} neither

requires this nor uses it---the data size required is taken from

context.

@item @code{@@}@code{@@}@var{aa}

@itemx @code{@@}@code{@@}@var{aa}:8

Memory indirect.  You may specify the @samp{:8} for clarity, if you

wish; but @code{@value{AS}} neither requires this nor uses it.

@end table

@node H8/300 Floating Point

@section Floating Point

@cindex floating point, H8/300 (@sc{ieee})

@cindex H8/300 floating point (@sc{ieee})

The H8/300 family has no hardware floating point, but the @code{.float}

directive generates @sc{ieee} floating-point numbers for compatibility

with other development tools.

@page

@node H8/300 Directives

@section H8/300 Machine Directives

@cindex H8/300 machine directives (none)

@cindex machine directives, H8/300 (none)

@cindex @code{word} directive, H8/300

@cindex @code{int} directive, H8/300

@code{@value{AS}} has the following machine-dependent directives for

the H8/300:

@table @code

@cindex H8/300H, assembling for

@item .h8300h

Recognize and emit additional instructions for the H8/300H variant, and

also make @code{.int} emit 32-bit numbers rather than the usual (16-bit)

for the H8/300 family.

@item .h8300s

Recognize and emit additional instructions for the H8S variant, and

also make @code{.int} emit 32-bit numbers rather than the usual (16-bit)

for the H8/300 family.

@item .h8300hn

Recognize and emit additional instructions for the H8/300H variant in

normal mode, and also make @code{.int} emit 32-bit numbers rather than

the usual (16-bit) for the H8/300 family.

@item .h8300sn

Recognize and emit additional instructions for the H8S variant in

normal mode, and also make @code{.int} emit 32-bit numbers rather than

the usual (16-bit) for the H8/300 family.

@end table

On the H8/300 family (including the H8/300H) @samp{.word} directives

generate 16-bit numbers.

@node H8/300 Opcodes

@section Opcodes

@cindex H8/300 opcode summary

@cindex opcode summary, H8/300

@cindex mnemonics, H8/300

@cindex instruction summary, H8/300

For detailed information on the H8/300 machine instruction set, see

@cite{H8/300 Series Programming Manual}.  For information specific to

the H8/300H, see @cite{H8/300H Series Programming Manual} (Renesas).

@code{@value{AS}} implements all the standard H8/300 opcodes.  No additional

pseudo-instructions are needed on this family.

@ifset SMALL

@c this table, due to the multi-col faking and hardcoded order, looks silly

@c except in smallbook.  See comments below "@set SMALL" near top of this file.

The following table summarizes the H8/300 opcodes, and their arguments.

Entries marked @samp{*} are opcodes used only on the H8/300H.

@smallexample

@c Using @group seems to use the normal baselineskip, not the smallexample

@c baselineskip; looks approx doublespaced.

         @i{Legend:}

            Rs   @r{source register}

            Rd   @r{destination register}

            abs  @r{absolute address}

            imm  @r{immediate data}

         disp:N  @r{N-bit displacement from a register}

        pcrel:N  @r{N-bit displacement relative to program counter}

   add.b #imm,rd              *  andc #imm,ccr

   add.b rs,rd                   band #imm,rd

   add.w rs,rd                   band #imm,@@rd

*  add.w #imm,rd                 band #imm,@@abs:8

*  add.l rs,rd                   bra  pcrel:8

*  add.l #imm,rd              *  bra  pcrel:16

   adds #imm,rd                  bt   pcrel:8

   addx #imm,rd               *  bt   pcrel:16

   addx rs,rd                    brn  pcrel:8

   and.b #imm,rd              *  brn  pcrel:16

   and.b rs,rd                   bf   pcrel:8

*  and.w rs,rd                *  bf   pcrel:16

*  and.w #imm,rd                 bhi  pcrel:8

*  and.l #imm,rd              *  bhi  pcrel:16

*  and.l rs,rd                   bls  pcrel:8

@page

*  bls  pcrel:16                 bld  #imm,rd

   bcc  pcrel:8                  bld  #imm,@@rd

*  bcc  pcrel:16                 bld  #imm,@@abs:8

   bhs  pcrel:8                  bnot #imm,rd

*  bhs  pcrel:16                 bnot #imm,@@rd

   bcs  pcrel:8                  bnot #imm,@@abs:8

*  bcs  pcrel:16                 bnot rs,rd

   blo  pcrel:8                  bnot rs,@@rd

*  blo  pcrel:16                 bnot rs,@@abs:8

   bne  pcrel:8                  bor  #imm,rd

*  bne  pcrel:16                 bor  #imm,@@rd

   beq  pcrel:8                  bor  #imm,@@abs:8

*  beq  pcrel:16                 bset #imm,rd

   bvc  pcrel:8                  bset #imm,@@rd

*  bvc  pcrel:16                 bset #imm,@@abs:8

   bvs  pcrel:8                  bset rs,rd

*  bvs  pcrel:16                 bset rs,@@rd

   bpl  pcrel:8                  bset rs,@@abs:8

*  bpl  pcrel:16                 bsr  pcrel:8

   bmi  pcrel:8                  bsr  pcrel:16

*  bmi  pcrel:16                 bst  #imm,rd

   bge  pcrel:8                  bst  #imm,@@rd

*  bge  pcrel:16                 bst  #imm,@@abs:8

   blt  pcrel:8                  btst #imm,rd

*  blt  pcrel:16                 btst #imm,@@rd

   bgt  pcrel:8                  btst #imm,@@abs:8

*  bgt  pcrel:16                 btst rs,rd

   ble  pcrel:8                  btst rs,@@rd

*  ble  pcrel:16                 btst rs,@@abs:8

   bclr #imm,rd                  bxor #imm,rd

   bclr #imm,@@rd                 bxor #imm,@@rd

   bclr #imm,@@abs:8              bxor #imm,@@abs:8

   bclr rs,rd                    cmp.b #imm,rd

   bclr rs,@@rd                   cmp.b rs,rd

   bclr rs,@@abs:8                cmp.w rs,rd

   biand #imm,rd                 cmp.w rs,rd

   biand #imm,@@rd             *  cmp.w #imm,rd

   biand #imm,@@abs:8          *  cmp.l #imm,rd

   bild #imm,rd               *  cmp.l rs,rd

   bild #imm,@@rd                 daa  rs

   bild #imm,@@abs:8              das  rs

   bior #imm,rd                  dec.b rs

   bior #imm,@@rd              *  dec.w #imm,rd

   bior #imm,@@abs:8           *  dec.l #imm,rd

   bist #imm,rd                  divxu.b rs,rd

   bist #imm,@@rd              *  divxu.w rs,rd

   bist #imm,@@abs:8           *  divxs.b rs,rd

   bixor #imm,rd              *  divxs.w rs,rd

   bixor #imm,@@rd                eepmov

   bixor #imm,@@abs:8          *  eepmovw

@page

*  exts.w rd                     mov.w rs,@@abs:16

*  exts.l rd                  *  mov.l #imm,rd

*  extu.w rd                  *  mov.l rs,rd

*  extu.l rd                  *  mov.l @@rs,rd

   inc  rs                    *  mov.l @@(disp:16,rs),rd

*  inc.w #imm,rd              *  mov.l @@(disp:24,rs),rd

*  inc.l #imm,rd              *  mov.l @@rs+,rd

   jmp  @@rs                   *  mov.l @@abs:16,rd

   jmp  abs                   *  mov.l @@abs:24,rd

   jmp  @@@@abs:8               *  mov.l rs,@@rd

   jsr  @@rs                   *  mov.l rs,@@(disp:16,rd)

   jsr  abs                   *  mov.l rs,@@(disp:24,rd)

   jsr  @@@@abs:8               *  mov.l rs,@@-rd

   ldc  #imm,ccr              *  mov.l rs,@@abs:16

   ldc  rs,ccr                *  mov.l rs,@@abs:24

*  ldc  @@abs:16,ccr              movfpe @@abs:16,rd

*  ldc  @@abs:24,ccr              movtpe rs,@@abs:16

*  ldc  @@(disp:16,rs),ccr        mulxu.b rs,rd

*  ldc  @@(disp:24,rs),ccr     *  mulxu.w rs,rd

*  ldc  @@rs+,ccr              *  mulxs.b rs,rd

*  ldc  @@rs,ccr               *  mulxs.w rs,rd

*  mov.b @@(disp:24,rs),rd        neg.b rs

*  mov.b rs,@@(disp:24,rd)     *  neg.w rs

   mov.b @@abs:16,rd           *  neg.l rs

   mov.b rs,rd                   nop

   mov.b @@abs:8,rd               not.b rs

   mov.b rs,@@abs:8            *  not.w rs

   mov.b rs,rd                *  not.l rs

   mov.b #imm,rd                 or.b #imm,rd

   mov.b @@rs,rd                  or.b rs,rd

   mov.b @@(disp:16,rs),rd     *  or.w #imm,rd

   mov.b @@rs+,rd              *  or.w rs,rd

   mov.b @@abs:8,rd            *  or.l #imm,rd

   mov.b rs,@@rd               *  or.l rs,rd

   mov.b rs,@@(disp:16,rd)        orc  #imm,ccr

   mov.b rs,@@-rd                 pop.w rs

   mov.b rs,@@abs:8            *  pop.l rs

   mov.w rs,@@rd                  push.w rs

*  mov.w @@(disp:24,rs),rd     *  push.l rs

*  mov.w rs,@@(disp:24,rd)        rotl.b rs

*  mov.w @@abs:24,rd           *  rotl.w rs

*  mov.w rs,@@abs:24           *  rotl.l rs

   mov.w rs,rd                   rotr.b rs

   mov.w #imm,rd              *  rotr.w rs

   mov.w @@rs,rd               *  rotr.l rs

   mov.w @@(disp:16,rs),rd        rotxl.b rs

   mov.w @@rs+,rd              *  rotxl.w rs

   mov.w @@abs:16,rd           *  rotxl.l rs

   mov.w rs,@@(disp:16,rd)        rotxr.b rs

   mov.w rs,@@-rd              *  rotxr.w rs

@page

*  rotxr.l rs                 *  stc  ccr,@@(disp:24,rd)

   bpt                        *  stc  ccr,@@-rd

   rte                        *  stc  ccr,@@abs:16

   rts                        *  stc  ccr,@@abs:24

   shal.b rs                     sub.b rs,rd

*  shal.w rs                     sub.w rs,rd

*  shal.l rs                  *  sub.w #imm,rd

   shar.b rs                  *  sub.l rs,rd

*  shar.w rs                  *  sub.l #imm,rd

*  shar.l rs                     subs #imm,rd

   shll.b rs                     subx #imm,rd

*  shll.w rs                     subx rs,rd

*  shll.l rs                  *  trapa #imm

   shlr.b rs                     xor  #imm,rd

*  shlr.w rs                     xor  rs,rd

*  shlr.l rs                  *  xor.w #imm,rd

   sleep                      *  xor.w rs,rd

   stc  ccr,rd                *  xor.l #imm,rd

*  stc  ccr,@@rs               *  xor.l rs,rd

*  stc  ccr,@@(disp:16,rd)        xorc #imm,ccr

@end smallexample

@end ifset

@cindex size suffixes, H8/300

@cindex H8/300 size suffixes

Four H8/300 instructions (@code{add}, @code{cmp}, @code{mov},

@code{sub}) are defined with variants using the suffixes @samp{.b},

@samp{.w}, and @samp{.l} to specify the size of a memory operand.

@code{@value{AS}} supports these suffixes, but does not require them;

since one of the operands is always a register, @code{@value{AS}} can

deduce the correct size.

For example, since @code{r0} refers to a 16-bit register,

@example

mov    r0,@@foo

@exdent is equivalent to

mov.w  r0,@@foo

@end example

If you use the size suffixes, @code{@value{AS}} issues a warning when

the suffix and the register size do not match.