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@c Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
@c This is part of the GAS manual.
@c For copying conditions, see the file as.texinfo.
@page
@node H8/500-Dependent
@chapter H8/500 Dependent Features
@cindex H8/500 support
@menu
* H8/500 Options:: Options
* H8/500 Syntax:: Syntax
* H8/500 Floating Point:: Floating Point
* H8/500 Directives:: H8/500 Machine Directives
* H8/500 Opcodes:: Opcodes
@end menu
@node H8/500 Options
@section Options
@cindex H8/500 options (none)
@cindex options, H8/500 (none)
@code{@value{AS}} has no additional command-line options for the Hitachi
H8/500 family.
@node H8/500 Syntax
@section Syntax
@menu
* H8/500-Chars:: Special Characters
* H8/500-Regs:: Register Names
* H8/500-Addressing:: Addressing Modes
@end menu
@node H8/500-Chars
@subsection Special Characters
@cindex line comment character, H8/500
@cindex H8/500 line comment character
@samp{!} is the line comment character.
@cindex line separator, H8/500
@cindex statement separator, H8/500
@cindex H8/500 line separator
@samp{;} can be used instead of a newline to separate statements.
@cindex symbol names, @samp{$} in
@cindex @code{$} in symbol names
Since @samp{$} has no special meaning, you may use it in symbol names.
@node H8/500-Regs
@subsection Register Names
@cindex H8/500 registers
@cindex registers, H8/500
You can use the predefined symbols @samp{r0}, @samp{r1}, @samp{r2},
@samp{r3}, @samp{r4}, @samp{r5}, @samp{r6}, and @samp{r7} to refer to
the H8/500 registers.
The H8/500 also has these control registers:
@table @code
@item cp
code pointer
@item dp
data pointer
@item bp
base pointer
@item tp
stack top pointer
@item ep
extra pointer
@item sr
status register
@item ccr
condition code register
@end table
All registers are 16 bits long. To represent 32 bit numbers, use two
adjacent registers; for distant memory addresses, use one of the segment
pointers (@code{cp} for the program counter; @code{dp} for
@code{r0}--@code{r3}; @code{ep} for @code{r4} and @code{r5}; and
@code{tp} for @code{r6} and @code{r7}.
@node H8/500-Addressing
@subsection Addressing Modes
@cindex addressing modes, H8/500
@cindex H8/500 addressing modes
@value{AS} understands the following addressing modes for the H8/500:
@table @code
@item R@var{n}
Register direct
@item @@R@var{n}
Register indirect
@item @@(d:8, R@var{n})
Register indirect with 8 bit signed displacement
@item @@(d:16, R@var{n})
Register indirect with 16 bit signed displacement
@item @@-R@var{n}
Register indirect with pre-decrement
@item @@R@var{n}+
Register indirect with post-increment
@item @@@var{aa}:8
8 bit absolute address
@item @@@var{aa}:16
16 bit absolute address
@item #@var{xx}:8
8 bit immediate
@item #@var{xx}:16
16 bit immediate
@end table
@node H8/500 Floating Point
@section Floating Point
@cindex floating point, H8/500 (@sc{ieee})
@cindex H8/500 floating point (@sc{ieee})
The H8/500 family has no hardware floating point, but the @code{.float}
directive generates @sc{ieee} floating-point numbers for compatibility
with other development tools.
@node H8/500 Directives
@section H8/500 Machine Directives
@cindex H8/500 machine directives (none)
@cindex machine directives, H8/500 (none)
@cindex @code{word} directive, H8/500
@cindex @code{int} directive, H8/500
@code{@value{AS}} has no machine-dependent directives for the H8/500.
However, on this platform the @samp{.int} and @samp{.word} directives
generate 16-bit numbers.
@node H8/500 Opcodes
@section Opcodes
@cindex H8/500 opcode summary
@cindex opcode summary, H8/500
@cindex mnemonics, H8/500
@cindex instruction summary, H8/500
For detailed information on the H8/500 machine instruction set, see
@cite{H8/500 Series Programming Manual} (Hitachi M21T001).
@code{@value{AS}} implements all the standard H8/500 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 H8/500 opcodes and their operands:
@c Use @group if it ever works, instead of @page
@page
@smallexample
@i{Legend:}
abs8 @r{8-bit absolute address}
abs16 @r{16-bit absolute address}
abs24 @r{24-bit absolute address}
crb @r{@code{ccr}, @code{br}, @code{ep}, @code{dp}, @code{tp}, @code{dp}}
disp8 @r{8-bit displacement}
ea @r{@code{rn}, @code{@@rn}, @code{@@(d:8, rn)}, @code{@@(d:16, rn)},}
@r{@code{@@-rn}, @code{@@rn+}, @code{@@aa:8}, @code{@@aa:16},}
@r{@code{#xx:8}, @code{#xx:16}}
ea_mem @r{@code{@@rn}, @code{@@(d:8, rn)}, @code{@@(d:16, rn)},}
@r{@code{@@-rn}, @code{@@rn+}, @code{@@aa:8}, @code{@@aa:16}}
ea_noimm @r{@code{rn}, @code{@@rn}, @code{@@(d:8, rn)}, @code{@@(d:16, rn)},}
@r{@code{@@-rn}, @code{@@rn+}, @code{@@aa:8}, @code{@@aa:16}}
fp r6
imm4 @r{4-bit immediate data}
imm8 @r{8-bit immediate data}
imm16 @r{16-bit immediate data}
pcrel8 @r{8-bit offset from program counter}
pcrel16 @r{16-bit offset from program counter}
qim @r{@code{-2}, @code{-1}, @code{1}, @code{2}}
rd @r{any register}
rs @r{a register distinct from rd}
rlist @r{comma-separated list of registers in parentheses;}
@r{register ranges @code{rd-rs} are allowed}
sp @r{stack pointer (@code{r7})}
sr @r{status register}
sz @r{size; @samp{.b} or @samp{.w}. If omitted, default @samp{.w}}
ldc[.b] ea,crb bcc[.w] pcrel16
ldc[.w] ea,sr bcc[.b] pcrel8
add[:q] sz qim,ea_noimm bhs[.w] pcrel16
add[:g] sz ea,rd bhs[.b] pcrel8
adds sz ea,rd bcs[.w] pcrel16
addx sz ea,rd bcs[.b] pcrel8
and sz ea,rd blo[.w] pcrel16
andc[.b] imm8,crb blo[.b] pcrel8
andc[.w] imm16,sr bne[.w] pcrel16
bpt bne[.b] pcrel8
bra[.w] pcrel16 beq[.w] pcrel16
bra[.b] pcrel8 beq[.b] pcrel8
bt[.w] pcrel16 bvc[.w] pcrel16
bt[.b] pcrel8 bvc[.b] pcrel8
brn[.w] pcrel16 bvs[.w] pcrel16
brn[.b] pcrel8 bvs[.b] pcrel8
bf[.w] pcrel16 bpl[.w] pcrel16
bf[.b] pcrel8 bpl[.b] pcrel8
bhi[.w] pcrel16 bmi[.w] pcrel16
bhi[.b] pcrel8 bmi[.b] pcrel8
bls[.w] pcrel16 bge[.w] pcrel16
bls[.b] pcrel8 bge[.b] pcrel8
@page
blt[.w] pcrel16 mov[:g][.b] imm8,ea_mem
blt[.b] pcrel8 mov[:g][.w] imm16,ea_mem
bgt[.w] pcrel16 movfpe[.b] ea,rd
bgt[.b] pcrel8 movtpe[.b] rs,ea_noimm
ble[.w] pcrel16 mulxu sz ea,rd
ble[.b] pcrel8 neg sz ea
bclr sz imm4,ea_noimm nop
bclr sz rs,ea_noimm not sz ea
bnot sz imm4,ea_noimm or sz ea,rd
bnot sz rs,ea_noimm orc[.b] imm8,crb
bset sz imm4,ea_noimm orc[.w] imm16,sr
bset sz rs,ea_noimm pjmp abs24
bsr[.b] pcrel8 pjmp @@rd
bsr[.w] pcrel16 pjsr abs24
btst sz imm4,ea_noimm pjsr @@rd
btst sz rs,ea_noimm prtd imm8
clr sz ea prtd imm16
cmp[:e][.b] imm8,rd prts
cmp[:i][.w] imm16,rd rotl sz ea
cmp[:g].b imm8,ea_noimm rotr sz ea
cmp[:g][.w] imm16,ea_noimm rotxl sz ea
Cmp[:g] sz ea,rd rotxr sz ea
dadd rs,rd rtd imm8
divxu sz ea,rd rtd imm16
dsub rs,rd rts
exts[.b] rd scb/f rs,pcrel8
extu[.b] rd scb/ne rs,pcrel8
jmp @@rd scb/eq rs,pcrel8
jmp @@(imm8,rd) shal sz ea
jmp @@(imm16,rd) shar sz ea
jmp abs16 shll sz ea
jsr @@rd shlr sz ea
jsr @@(imm8,rd) sleep
jsr @@(imm16,rd) stc[.b] crb,ea_noimm
jsr abs16 stc[.w] sr,ea_noimm
ldm @@sp+,(rlist) stm (rlist),@@-sp
link fp,imm8 sub sz ea,rd
link fp,imm16 subs sz ea,rd
mov[:e][.b] imm8,rd subx sz ea,rd
mov[:i][.w] imm16,rd swap[.b] rd
mov[:l][.w] abs8,rd tas[.b] ea
mov[:l].b abs8,rd trapa imm4
mov[:s][.w] rs,abs8 trap/vs
mov[:s].b rs,abs8 tst sz ea
mov[:f][.w] @@(disp8,fp),rd unlk fp
mov[:f][.w] rs,@@(disp8,fp) xch[.w] rs,rd
mov[:f].b @@(disp8,fp),rd xor sz ea,rd
mov[:f].b rs,@@(disp8,fp) xorc.b imm8,crb
mov[:g] sz rs,ea_mem xorc.w imm16,sr
mov[:g] sz ea,rd
@end smallexample
@end ifset
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