source: trunk/binutils/gas/doc/as.info-5@ 3260

This is as.info, produced by makeinfo version 4.3 from as.texinfo.

START-INFO-DIR-ENTRY
* As: (as).                     The GNU assembler.
* Gas: (as).                    The GNU assembler.
END-INFO-DIR-ENTRY

   This file documents the GNU Assembler "as".

   Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002
Free Software Foundation, Inc.

   Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.1 or
any later version published by the Free Software Foundation; with no
Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
Texts.  A copy of the license is included in the section entitled "GNU
Free Documentation License".


File: as.info,  Node: CRIS-Regs,  Next: CRIS-Pseudos,  Prev: CRIS-Pic,  Up: CRIS-Syntax

Register names
..............

   A `$' character may always prefix a general or special register name
in an instruction operand but is mandatory when the option
`--no-underscore' is specified or when the `.syntax register_prefix'
directive is in effect (*note crisnous::).  Register names are
case-insensitive.


File: as.info,  Node: CRIS-Pseudos,  Prev: CRIS-Regs,  Up: CRIS-Syntax

Assembler Directives
....................

   There are a few CRIS-specific pseudo-directives in addition to the
generic ones.  *Note Pseudo Ops::.  Constants emitted by
pseudo-directives are in little-endian order for CRIS.  There is no
support for floating-point-specific directives for CRIS.

`.dword EXPRESSIONS'
     The `.dword' directive is a synonym for `.int', expecting zero or
     more EXPRESSIONS, separated by commas.  For each expression, a
     32-bit little-endian constant is emitted.

`.syntax ARGUMENT'
     The `.syntax' directive takes as ARGUMENT one of the following
     case-sensitive choices.

    `no_register_prefix'
          The `.syntax no_register_prefix' directive makes a `$'
          character prefix on all registers optional.  It overrides a
          previous setting, including the corresponding effect of the
          option `--no-underscore'.  If this directive is used when
          ordinary symbols do not have a `_' character prefix, care
          must be taken to avoid ambiguities whether an operand is a
          register or a symbol; using symbols with names the same as
          general or special registers then invoke undefined behavior.

    `register_prefix'
          This directive makes a `$' character prefix on all registers
          mandatory.  It overrides a previous setting, including the
          corresponding effect of the option `--underscore'.

    `leading_underscore'
          This is an assertion directive, emitting an error if the
          `--no-underscore' option is in effect.

    `no_leading_underscore'
          This is the opposite of the `.syntax leading_underscore'
          directive and emits an error if the option `--underscore' is
          in effect.


File: as.info,  Node: D10V-Dependent,  Next: D30V-Dependent,  Prev: CRIS-Dependent,  Up: Machine Dependencies

D10V Dependent Features
=======================

* Menu:

* D10V-Opts::                   D10V Options
* D10V-Syntax::                 Syntax
* D10V-Float::                  Floating Point
* D10V-Opcodes::                Opcodes


File: as.info,  Node: D10V-Opts,  Next: D10V-Syntax,  Up: D10V-Dependent

D10V Options
------------

   The Mitsubishi D10V version of `as' has a few machine dependent
options.

`-O'
     The D10V can often execute two sub-instructions in parallel. When
     this option is used, `as' will attempt to optimize its output by
     detecting when instructions can be executed in parallel.

`--nowarnswap'
     To optimize execution performance, `as' will sometimes swap the
     order of instructions. Normally this generates a warning. When
     this option is used, no warning will be generated when
     instructions are swapped.

`--gstabs-packing'

`--no-gstabs-packing'
     `as' packs adjacent short instructions into a single packed
     instruction. `--no-gstabs-packing' turns instruction packing off if
     `--gstabs' is specified as well; `--gstabs-packing' (the default)
     turns instruction packing on even when `--gstabs' is specified.


File: as.info,  Node: D10V-Syntax,  Next: D10V-Float,  Prev: D10V-Opts,  Up: D10V-Dependent

Syntax
------

   The D10V syntax is based on the syntax in Mitsubishi's D10V
architecture manual.  The differences are detailed below.

* Menu:

* D10V-Size::                 Size Modifiers
* D10V-Subs::                 Sub-Instructions
* D10V-Chars::                Special Characters
* D10V-Regs::                 Register Names
* D10V-Addressing::           Addressing Modes
* D10V-Word::                 @WORD Modifier


File: as.info,  Node: D10V-Size,  Next: D10V-Subs,  Up: D10V-Syntax

Size Modifiers
..............

   The D10V version of `as' uses the instruction names in the D10V
Architecture Manual.  However, the names in the manual are sometimes
ambiguous.  There are instruction names that can assemble to a short or
long form opcode.  How does the assembler pick the correct form?  `as'
will always pick the smallest form if it can.  When dealing with a
symbol that is not defined yet when a line is being assembled, it will
always use the long form.  If you need to force the assembler to use
either the short or long form of the instruction, you can append either
`.s' (short) or `.l' (long) to it.  For example, if you are writing an
assembly program and you want to do a branch to a symbol that is
defined later in your program, you can write `bra.s   foo'.  Objdump
and GDB will always append `.s' or `.l' to instructions which have both
short and long forms.


File: as.info,  Node: D10V-Subs,  Next: D10V-Chars,  Prev: D10V-Size,  Up: D10V-Syntax

Sub-Instructions
................

   The D10V assembler takes as input a series of instructions, either
one-per-line, or in the special two-per-line format described in the
next section.  Some of these instructions will be short-form or
sub-instructions.  These sub-instructions can be packed into a single
instruction.  The assembler will do this automatically.  It will also
detect when it should not pack instructions.  For example, when a label
is defined, the next instruction will never be packaged with the
previous one.  Whenever a branch and link instruction is called, it
will not be packaged with the next instruction so the return address
will be valid.  Nops are automatically inserted when necessary.

   If you do not want the assembler automatically making these
decisions, you can control the packaging and execution type (parallel
or sequential) with the special execution symbols described in the next
section.


File: as.info,  Node: D10V-Chars,  Next: D10V-Regs,  Prev: D10V-Subs,  Up: D10V-Syntax

Special Characters
..................

   `;' and `#' are the line comment characters.  Sub-instructions may
be executed in order, in reverse-order, or in parallel.  Instructions
listed in the standard one-per-line format will be executed
sequentially.  To specify the executing order, use the following
symbols:
`->'
     Sequential with instruction on the left first.

`<-'
     Sequential with instruction on the right first.

`||'
     Parallel The D10V syntax allows either one instruction per line,
one instruction per line with the execution symbol, or two instructions
per line.  For example
`abs       a1      ->      abs     r0'
     Execute these sequentially.  The instruction on the right is in
     the right container and is executed second.

`abs       r0      <-      abs     a1'
     Execute these reverse-sequentially.  The instruction on the right
     is in the right container, and is executed first.

`ld2w    r2,@r8+         ||      mac     a0,r0,r7'
     Execute these in parallel.

`ld2w    r2,@r8+         ||'
`mac     a0,r0,r7'
     Two-line format. Execute these in parallel.

`ld2w    r2,@r8+'
`mac     a0,r0,r7'
     Two-line format. Execute these sequentially.  Assembler will put
     them in the proper containers.

`ld2w    r2,@r8+         ->'
`mac     a0,r0,r7'
     Two-line format. Execute these sequentially.  Same as above but
     second instruction will always go into right container.  Since `$'
has no special meaning, you may use it in symbol names.


File: as.info,  Node: D10V-Regs,  Next: D10V-Addressing,  Prev: D10V-Chars,  Up: D10V-Syntax

Register Names
..............

   You can use the predefined symbols `r0' through `r15' to refer to
the D10V registers.  You can also use `sp' as an alias for `r15'.  The
accumulators are `a0' and `a1'.  There are special register-pair names
that may optionally be used in opcodes that require even-numbered
registers. Register names are not case sensitive.

   Register Pairs
`r0-r1'

`r2-r3'

`r4-r5'

`r6-r7'

`r8-r9'

`r10-r11'

`r12-r13'

`r14-r15'
   The D10V also has predefined symbols for these control registers and
status bits:
`psw'
     Processor Status Word

`bpsw'
     Backup Processor Status Word

`pc'
     Program Counter

`bpc'
     Backup Program Counter

`rpt_c'
     Repeat Count

`rpt_s'
     Repeat Start address

`rpt_e'
     Repeat End address

`mod_s'
     Modulo Start address

`mod_e'
     Modulo End address

`iba'
     Instruction Break Address

`f0'
     Flag 0

`f1'
     Flag 1

`c'
     Carry flag


File: as.info,  Node: D10V-Addressing,  Next: D10V-Word,  Prev: D10V-Regs,  Up: D10V-Syntax

Addressing Modes
................

   `as' understands the following addressing modes for the D10V.  `RN'
in the following refers to any of the numbered registers, but _not_ the
control registers.
`RN'
     Register direct

`@RN'
     Register indirect

`@RN+'
     Register indirect with post-increment

`@RN-'
     Register indirect with post-decrement

`@-SP'
     Register indirect with pre-decrement

`@(DISP, RN)'
     Register indirect with displacement

`ADDR'
     PC relative address (for branch or rep).

`#IMM'
     Immediate data (the `#' is optional and ignored)


File: as.info,  Node: D10V-Word,  Prev: D10V-Addressing,  Up: D10V-Syntax

@WORD Modifier
..............

   Any symbol followed by `@word' will be replaced by the symbol's value
shifted right by 2.  This is used in situations such as loading a
register with the address of a function (or any other code fragment).
For example, if you want to load a register with the location of the
function `main' then jump to that function, you could do it as follows:
     ldi     r2, main@word
     jmp     r2


File: as.info,  Node: D10V-Float,  Next: D10V-Opcodes,  Prev: D10V-Syntax,  Up: D10V-Dependent

Floating Point
--------------

   The D10V has no hardware floating point, but the `.float' and
`.double' directives generates IEEE floating-point numbers for
compatibility with other development tools.


File: as.info,  Node: D10V-Opcodes,  Prev: D10V-Float,  Up: D10V-Dependent

Opcodes
-------

   For detailed information on the D10V machine instruction set, see
`D10V Architecture: A VLIW Microprocessor for Multimedia Applications'
(Mitsubishi Electric Corp.).  `as' implements all the standard D10V
opcodes.  The only changes are those described in the section on size
modifiers


File: as.info,  Node: D30V-Dependent,  Next: H8/300-Dependent,  Prev: D10V-Dependent,  Up: Machine Dependencies

D30V Dependent Features
=======================

* Menu:

* D30V-Opts::                   D30V Options
* D30V-Syntax::                 Syntax
* D30V-Float::                  Floating Point
* D30V-Opcodes::                Opcodes


File: as.info,  Node: D30V-Opts,  Next: D30V-Syntax,  Up: D30V-Dependent

D30V Options
------------

   The Mitsubishi D30V version of `as' has a few machine dependent
options.

`-O'
     The D30V can often execute two sub-instructions in parallel. When
     this option is used, `as' will attempt to optimize its output by
     detecting when instructions can be executed in parallel.

`-n'
     When this option is used, `as' will issue a warning every time it
     adds a nop instruction.

`-N'
     When this option is used, `as' will issue a warning if it needs to
     insert a nop after a 32-bit multiply before a load or 16-bit
     multiply instruction.


File: as.info,  Node: D30V-Syntax,  Next: D30V-Float,  Prev: D30V-Opts,  Up: D30V-Dependent

Syntax
------

   The D30V syntax is based on the syntax in Mitsubishi's D30V
architecture manual.  The differences are detailed below.

* Menu:

* D30V-Size::                 Size Modifiers
* D30V-Subs::                 Sub-Instructions
* D30V-Chars::                Special Characters
* D30V-Guarded::              Guarded Execution
* D30V-Regs::                 Register Names
* D30V-Addressing::           Addressing Modes


File: as.info,  Node: D30V-Size,  Next: D30V-Subs,  Up: D30V-Syntax

Size Modifiers
..............

   The D30V version of `as' uses the instruction names in the D30V
Architecture Manual.  However, the names in the manual are sometimes
ambiguous.  There are instruction names that can assemble to a short or
long form opcode.  How does the assembler pick the correct form?  `as'
will always pick the smallest form if it can.  When dealing with a
symbol that is not defined yet when a line is being assembled, it will
always use the long form.  If you need to force the assembler to use
either the short or long form of the instruction, you can append either
`.s' (short) or `.l' (long) to it.  For example, if you are writing an
assembly program and you want to do a branch to a symbol that is
defined later in your program, you can write `bra.s foo'.  Objdump and
GDB will always append `.s' or `.l' to instructions which have both
short and long forms.


File: as.info,  Node: D30V-Subs,  Next: D30V-Chars,  Prev: D30V-Size,  Up: D30V-Syntax

Sub-Instructions
................

   The D30V assembler takes as input a series of instructions, either
one-per-line, or in the special two-per-line format described in the
next section.  Some of these instructions will be short-form or
sub-instructions.  These sub-instructions can be packed into a single
instruction.  The assembler will do this automatically.  It will also
detect when it should not pack instructions.  For example, when a label
is defined, the next instruction will never be packaged with the
previous one.  Whenever a branch and link instruction is called, it
will not be packaged with the next instruction so the return address
will be valid.  Nops are automatically inserted when necessary.

   If you do not want the assembler automatically making these
decisions, you can control the packaging and execution type (parallel
or sequential) with the special execution symbols described in the next
section.


File: as.info,  Node: D30V-Chars,  Next: D30V-Guarded,  Prev: D30V-Subs,  Up: D30V-Syntax

Special Characters
..................

   `;' and `#' are the line comment characters.  Sub-instructions may
be executed in order, in reverse-order, or in parallel.  Instructions
listed in the standard one-per-line format will be executed
sequentially unless you use the `-O' option.

   To specify the executing order, use the following symbols:
`->'
     Sequential with instruction on the left first.

`<-'
     Sequential with instruction on the right first.

`||'
     Parallel

   The D30V syntax allows either one instruction per line, one
instruction per line with the execution symbol, or two instructions per
line.  For example
`abs r2,r3 -> abs r4,r5'
     Execute these sequentially.  The instruction on the right is in
     the right container and is executed second.

`abs r2,r3 <- abs r4,r5'
     Execute these reverse-sequentially.  The instruction on the right
     is in the right container, and is executed first.

`abs r2,r3 || abs r4,r5'
     Execute these in parallel.

`ldw r2,@(r3,r4) ||'
`mulx r6,r8,r9'
     Two-line format. Execute these in parallel.

`mulx a0,r8,r9'
`stw r2,@(r3,r4)'
     Two-line format. Execute these sequentially unless `-O' option is
     used.  If the `-O' option is used, the assembler will determine if
     the instructions could be done in parallel (the above two
     instructions can be done in parallel), and if so, emit them as
     parallel instructions.  The assembler will put them in the proper
     containers.  In the above example, the assembler will put the
     `stw' instruction in left container and the `mulx' instruction in
     the right container.

`stw r2,@(r3,r4) ->'
`mulx a0,r8,r9'
     Two-line format.  Execute the `stw' instruction followed by the
     `mulx' instruction sequentially.  The first instruction goes in the
     left container and the second instruction goes into right
     container.  The assembler will give an error if the machine
     ordering constraints are violated.

`stw r2,@(r3,r4) <-'
`mulx a0,r8,r9'
     Same as previous example, except that the `mulx' instruction is
     executed before the `stw' instruction.

   Since `$' has no special meaning, you may use it in symbol names.


File: as.info,  Node: D30V-Guarded,  Next: D30V-Regs,  Prev: D30V-Chars,  Up: D30V-Syntax

Guarded Execution
.................

   `as' supports the full range of guarded execution directives for
each instruction.  Just append the directive after the instruction
proper.  The directives are:

`/tx'
     Execute the instruction if flag f0 is true.

`/fx'
     Execute the instruction if flag f0 is false.

`/xt'
     Execute the instruction if flag f1 is true.

`/xf'
     Execute the instruction if flag f1 is false.

`/tt'
     Execute the instruction if both flags f0 and f1 are true.

`/tf'
     Execute the instruction if flag f0 is true and flag f1 is false.


File: as.info,  Node: D30V-Regs,  Next: D30V-Addressing,  Prev: D30V-Guarded,  Up: D30V-Syntax

Register Names
..............

   You can use the predefined symbols `r0' through `r63' to refer to
the D30V registers.  You can also use `sp' as an alias for `r63' and
`link' as an alias for `r62'.  The accumulators are `a0' and `a1'.

   The D30V also has predefined symbols for these control registers and
status bits:
`psw'
     Processor Status Word

`bpsw'
     Backup Processor Status Word

`pc'
     Program Counter

`bpc'
     Backup Program Counter

`rpt_c'
     Repeat Count

`rpt_s'
     Repeat Start address

`rpt_e'
     Repeat End address

`mod_s'
     Modulo Start address

`mod_e'
     Modulo End address

`iba'
     Instruction Break Address

`f0'
     Flag 0

`f1'
     Flag 1

`f2'
     Flag 2

`f3'
     Flag 3

`f4'
     Flag 4

`f5'
     Flag 5

`f6'
     Flag 6

`f7'
     Flag 7

`s'
     Same as flag 4 (saturation flag)

`v'
     Same as flag 5 (overflow flag)

`va'
     Same as flag 6 (sticky overflow flag)

`c'
     Same as flag 7 (carry/borrow flag)

`b'
     Same as flag 7 (carry/borrow flag)


File: as.info,  Node: D30V-Addressing,  Prev: D30V-Regs,  Up: D30V-Syntax

Addressing Modes
................

   `as' understands the following addressing modes for the D30V.  `RN'
in the following refers to any of the numbered registers, but _not_ the
control registers.
`RN'
     Register direct

`@RN'
     Register indirect

`@RN+'
     Register indirect with post-increment

`@RN-'
     Register indirect with post-decrement

`@-SP'
     Register indirect with pre-decrement

`@(DISP, RN)'
     Register indirect with displacement

`ADDR'
     PC relative address (for branch or rep).

`#IMM'
     Immediate data (the `#' is optional and ignored)


File: as.info,  Node: D30V-Float,  Next: D30V-Opcodes,  Prev: D30V-Syntax,  Up: D30V-Dependent

Floating Point
--------------

   The D30V has no hardware floating point, but the `.float' and
`.double' directives generates IEEE floating-point numbers for
compatibility with other development tools.


File: as.info,  Node: D30V-Opcodes,  Prev: D30V-Float,  Up: D30V-Dependent

Opcodes
-------

   For detailed information on the D30V machine instruction set, see
`D30V Architecture: A VLIW Microprocessor for Multimedia Applications'
(Mitsubishi Electric Corp.).  `as' implements all the standard D30V
opcodes.  The only changes are those described in the section on size
modifiers


File: as.info,  Node: H8/300-Dependent,  Next: H8/500-Dependent,  Prev: D30V-Dependent,  Up: Machine Dependencies

H8/300 Dependent Features
=========================

* 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


File: as.info,  Node: H8/300 Options,  Next: H8/300 Syntax,  Up: H8/300-Dependent

Options
-------

   `as' has no additional command-line options for the Renesas
(formerly Hitachi) H8/300 family.


File: as.info,  Node: H8/300 Syntax,  Next: H8/300 Floating Point,  Prev: H8/300 Options,  Up: H8/300-Dependent

Syntax
------

* Menu:

* H8/300-Chars::                Special Characters
* H8/300-Regs::                 Register Names
* H8/300-Addressing::           Addressing Modes


File: as.info,  Node: H8/300-Chars,  Next: H8/300-Regs,  Up: H8/300 Syntax

Special Characters
..................

   `;' is the line comment character.

   `$' can be used instead of a newline to separate statements.
Therefore _you may not use `$' in symbol names_ on the H8/300.


File: as.info,  Node: H8/300-Regs,  Next: H8/300-Addressing,  Prev: H8/300-Chars,  Up: H8/300 Syntax

Register Names
..............

   You can use predefined symbols of the form `rNh' and `rNl' to refer
to the H8/300 registers as sixteen 8-bit general-purpose registers.  N
is a digit from `0' to `7'); for instance, both `r0h' and `r7l' are
valid register names.

   You can also use the eight predefined symbols `rN' 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 `erN'
(`er0' ... `er7') to refer to the 32-bit general purpose registers.

   The two control registers are called `pc' (program counter; a 16-bit
register, except on the H8/300H where it is 24 bits) and `ccr'
(condition code register; an 8-bit register).  `r7' is used as the
stack pointer, and can also be called `sp'.


File: as.info,  Node: H8/300-Addressing,  Prev: H8/300-Regs,  Up: H8/300 Syntax

Addressing Modes
................

   as understands the following addressing modes for the H8/300:
`rN'
     Register direct

`@rN'
     Register indirect

`@(D, rN)'
`@(D:16, rN)'
`@(D:24, rN)'
     Register indirect: 16-bit or 24-bit displacement D from register
     N.  (24-bit displacements are only meaningful on the H8/300H.)

`@rN+'
     Register indirect with post-increment

`@-rN'
     Register indirect with pre-decrement

``@'AA'
``@'AA:8'
``@'AA:16'
``@'AA:24'
     Absolute address `aa'.  (The address size `:24' only makes sense
     on the H8/300H.)

`#XX'
`#XX:8'
`#XX:16'
`#XX:32'
     Immediate data XX.  You may specify the `:8', `:16', or `:32' for
     clarity, if you wish; but `as' neither requires this nor uses
     it--the data size required is taken from context.

``@'`@'AA'
``@'`@'AA:8'
     Memory indirect.  You may specify the `:8' for clarity, if you
     wish; but `as' neither requires this nor uses it.


File: as.info,  Node: H8/300 Floating Point,  Next: H8/300 Directives,  Prev: H8/300 Syntax,  Up: H8/300-Dependent

Floating Point
--------------

   The H8/300 family has no hardware floating point, but the `.float'
directive generates IEEE floating-point numbers for compatibility with
other development tools.


File: as.info,  Node: H8/300 Directives,  Next: H8/300 Opcodes,  Prev: H8/300 Floating Point,  Up: H8/300-Dependent

H8/300 Machine Directives
-------------------------

   `as' has the following machine-dependent directives for the H8/300:

`.h8300h'
     Recognize and emit additional instructions for the H8/300H
     variant, and also make `.int' emit 32-bit numbers rather than the
     usual (16-bit) for the H8/300 family.

`.h8300s'
     Recognize and emit additional instructions for the H8S variant, and
     also make `.int' emit 32-bit numbers rather than the usual (16-bit)
     for the H8/300 family.

`.h8300hn'
     Recognize and emit additional instructions for the H8/300H variant
     in normal mode, and also make `.int' emit 32-bit numbers rather
     than the usual (16-bit) for the H8/300 family.

`.h8300sn'
     Recognize and emit additional instructions for the H8S variant in
     normal mode, and also make `.int' emit 32-bit numbers rather than
     the usual (16-bit) for the H8/300 family.

   On the H8/300 family (including the H8/300H) `.word' directives
generate 16-bit numbers.


File: as.info,  Node: H8/300 Opcodes,  Prev: H8/300 Directives,  Up: H8/300-Dependent

Opcodes
-------

   For detailed information on the H8/300 machine instruction set, see
`H8/300 Series Programming Manual'.  For information specific to the
H8/300H, see `H8/300H Series Programming Manual' (Renesas).

   `as' implements all the standard H8/300 opcodes.  No additional
pseudo-instructions are needed on this family.

   The following table summarizes the H8/300 opcodes, and their
arguments.  Entries marked `*' are opcodes used only on the H8/300H.

              Legend:
                 Rs   source register
                 Rd   destination register
                 abs  absolute address
                 imm  immediate data
              disp:N  N-bit displacement from a register
             pcrel:N  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
     
     *  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
     
     *  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
     
     *  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

   Four H8/300 instructions (`add', `cmp', `mov', `sub') are defined
with variants using the suffixes `.b', `.w', and `.l' to specify the
size of a memory operand.  `as' supports these suffixes, but does not
require them; since one of the operands is always a register, `as' can
deduce the correct size.

   For example, since `r0' refers to a 16-bit register,
     mov    r0,@foo
is equivalent to
     mov.w  r0,@foo

   If you use the size suffixes, `as' issues a warning when the suffix
and the register size do not match.


File: as.info,  Node: H8/500-Dependent,  Next: HPPA-Dependent,  Prev: H8/300-Dependent,  Up: Machine Dependencies

H8/500 Dependent Features
=========================

* 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


File: as.info,  Node: H8/500 Options,  Next: H8/500 Syntax,  Up: H8/500-Dependent

Options
-------

   `as' has no additional command-line options for the Renesas
(formerly Hitachi) H8/500 family.


File: as.info,  Node: H8/500 Syntax,  Next: H8/500 Floating Point,  Prev: H8/500 Options,  Up: H8/500-Dependent

Syntax
------

* Menu:

* H8/500-Chars::                Special Characters
* H8/500-Regs::                 Register Names
* H8/500-Addressing::           Addressing Modes


File: as.info,  Node: H8/500-Chars,  Next: H8/500-Regs,  Up: H8/500 Syntax

Special Characters
..................

   `!' is the line comment character.

   `;' can be used instead of a newline to separate statements.

   Since `$' has no special meaning, you may use it in symbol names.


File: as.info,  Node: H8/500-Regs,  Next: H8/500-Addressing,  Prev: H8/500-Chars,  Up: H8/500 Syntax

Register Names
..............

   You can use the predefined symbols `r0', `r1', `r2', `r3', `r4',
`r5', `r6', and `r7' to refer to the H8/500 registers.

   The H8/500 also has these control registers:

`cp'
     code pointer

`dp'
     data pointer

`bp'
     base pointer

`tp'
     stack top pointer

`ep'
     extra pointer

`sr'
     status register

`ccr'
     condition code register

   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 (`cp' for the program counter; `dp' for `r0'-`r3'; `ep' for
`r4' and `r5'; and `tp' for `r6' and `r7'.


File: as.info,  Node: H8/500-Addressing,  Prev: H8/500-Regs,  Up: H8/500 Syntax

Addressing Modes
................

   as understands the following addressing modes for the H8/500:
`RN'
     Register direct

`@RN'
     Register indirect

`@(d:8, RN)'
     Register indirect with 8 bit signed displacement

`@(d:16, RN)'
     Register indirect with 16 bit signed displacement

`@-RN'
     Register indirect with pre-decrement

`@RN+'
     Register indirect with post-increment

`@AA:8'
     8 bit absolute address

`@AA:16'
     16 bit absolute address

`#XX:8'
     8 bit immediate

`#XX:16'
     16 bit immediate


File: as.info,  Node: H8/500 Floating Point,  Next: H8/500 Directives,  Prev: H8/500 Syntax,  Up: H8/500-Dependent

Floating Point
--------------

   The H8/500 family has no hardware floating point, but the `.float'
directive generates IEEE floating-point numbers for compatibility with
other development tools.


File: as.info,  Node: H8/500 Directives,  Next: H8/500 Opcodes,  Prev: H8/500 Floating Point,  Up: H8/500-Dependent

H8/500 Machine Directives
-------------------------

   `as' has no machine-dependent directives for the H8/500.  However,
on this platform the `.int' and `.word' directives generate 16-bit
numbers.


File: as.info,  Node: H8/500 Opcodes,  Prev: H8/500 Directives,  Up: H8/500-Dependent

Opcodes
-------

   For detailed information on the H8/500 machine instruction set, see
`H8/500 Series Programming Manual' (Renesas M21T001).

   `as' implements all the standard H8/500 opcodes.  No additional
pseudo-instructions are needed on this family.

   The following table summarizes H8/500 opcodes and their operands:

     Legend:
     abs8      8-bit absolute address
     abs16     16-bit absolute address
     abs24     24-bit absolute address
     crb       `ccr', `br', `ep', `dp', `tp', `dp'
     disp8     8-bit displacement
     ea        `rn', `@rn', `@(d:8, rn)', `@(d:16, rn)',
               `@-rn', `@rn+', `@aa:8', `@aa:16',
               `#xx:8', `#xx:16'
     ea_mem    `@rn', `@(d:8, rn)', `@(d:16, rn)',
               `@-rn', `@rn+', `@aa:8', `@aa:16'
     ea_noimm  `rn', `@rn', `@(d:8, rn)', `@(d:16, rn)',
               `@-rn', `@rn+', `@aa:8', `@aa:16'
     fp        r6
     imm4      4-bit immediate data
     imm8      8-bit immediate data
     imm16     16-bit immediate data
     pcrel8    8-bit offset from program counter
     pcrel16   16-bit offset from program counter
     qim       `-2', `-1', `1', `2'
     rd        any register
     rs        a register distinct from rd
     rlist     comma-separated list of registers in parentheses;
               register ranges `rd-rs' are allowed
     sp        stack pointer (`r7')
     sr        status register
     sz        size; `.b' or `.w'.  If omitted, default `.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
     
     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


File: as.info,  Node: HPPA-Dependent,  Next: ESA/390-Dependent,  Prev: H8/500-Dependent,  Up: Machine Dependencies

HPPA Dependent Features
=======================

* Menu:

* HPPA Notes::                Notes
* HPPA Options::              Options
* HPPA Syntax::               Syntax
* HPPA Floating Point::       Floating Point
* HPPA Directives::           HPPA Machine Directives
* HPPA Opcodes::              Opcodes


File: as.info,  Node: HPPA Notes,  Next: HPPA Options,  Up: HPPA-Dependent

Notes
-----

   As a back end for GNU CC `as' has been throughly tested and should
work extremely well.  We have tested it only minimally on hand written
assembly code and no one has tested it much on the assembly output from
the HP compilers.

   The format of the debugging sections has changed since the original
`as' port (version 1.3X) was released; therefore, you must rebuild all
HPPA objects and libraries with the new assembler so that you can debug
the final executable.

   The HPPA `as' port generates a small subset of the relocations
available in the SOM and ELF object file formats.  Additional relocation
support will be added as it becomes necessary.


File: as.info,  Node: HPPA Options,  Next: HPPA Syntax,  Prev: HPPA Notes,  Up: HPPA-Dependent

Options
-------

   `as' has no machine-dependent command-line options for the HPPA.


File: as.info,  Node: HPPA Syntax,  Next: HPPA Floating Point,  Prev: HPPA Options,  Up: HPPA-Dependent

Syntax
------

   The assembler syntax closely follows the HPPA instruction set
reference manual; assembler directives and general syntax closely
follow the HPPA assembly language reference manual, with a few
noteworthy differences.

   First, a colon may immediately follow a label definition.  This is
simply for compatibility with how most assembly language programmers
write code.

   Some obscure expression parsing problems may affect hand written
code which uses the `spop' instructions, or code which makes significant
use of the `!' line separator.

   `as' is much less forgiving about missing arguments and other
similar oversights than the HP assembler.  `as' notifies you of missing
arguments as syntax errors; this is regarded as a feature, not a bug.

   Finally, `as' allows you to use an external symbol without
explicitly importing the symbol.  _Warning:_ in the future this will be
an error for HPPA targets.

   Special characters for HPPA targets include:

   `;' is the line comment character.

   `!' can be used instead of a newline to separate statements.

   Since `$' has no special meaning, you may use it in symbol names.


File: as.info,  Node: HPPA Floating Point,  Next: HPPA Directives,  Prev: HPPA Syntax,  Up: HPPA-Dependent

Floating Point
--------------

   The HPPA family uses IEEE floating-point numbers.