GNU Info
(as.info)HPPA Directives
HPPA Assembler Directives
-------------------------
`as' for the HPPA supports many additional directives for
compatibility with the native assembler. This section describes them
only briefly. For detailed information on HPPA-specific assembler
directives, see `HP9000 Series 800 Assembly Language Reference Manual'
(HP 92432-90001).
`as' does _not_ support the following assembler directives described
in the HP manual:
.endm .liston
.enter .locct
.leave .macro
.listoff
Beyond those implemented for compatibility, `as' supports one
additional assembler directive for the HPPA: `.param'. It conveys
register argument locations for static functions. Its syntax closely
follows the `.export' directive.
These are the additional directives in `as' for the HPPA:
`.block N'
`.blockz N'
Reserve N bytes of storage, and initialize them to zero.
`.call'
Mark the beginning of a procedure call. Only the special case
with _no arguments_ is allowed.
`.callinfo [ PARAM=VALUE, ... ] [ FLAG, ... ]'
Specify a number of parameters and flags that define the
environment for a procedure.
PARAM may be any of `frame' (frame size), `entry_gr' (end of
general register range), `entry_fr' (end of float register range),
`entry_sr' (end of space register range).
The values for FLAG are `calls' or `caller' (proc has
subroutines), `no_calls' (proc does not call subroutines),
`save_rp' (preserve return pointer), `save_sp' (proc preserves
stack pointer), `no_unwind' (do not unwind this proc), `hpux_int'
(proc is interrupt routine).
`.code'
Assemble into the standard section called `$TEXT$', subsection
`$CODE$'.
`.copyright "STRING"'
In the SOM object format, insert STRING into the object code,
marked as a copyright string.
`.copyright "STRING"'
In the ELF object format, insert STRING into the object code,
marked as a version string.
`.enter'
Not yet supported; the assembler rejects programs containing this
directive.
`.entry'
Mark the beginning of a procedure.
`.exit'
Mark the end of a procedure.
`.export NAME [ ,TYP ] [ ,PARAM=R ]'
Make a procedure NAME available to callers. TYP, if present, must
be one of `absolute', `code' (ELF only, not SOM), `data', `entry',
`data', `entry', `millicode', `plabel', `pri_prog', or `sec_prog'.
PARAM, if present, provides either relocation information for the
procedure arguments and result, or a privilege level. PARAM may be
`argwN' (where N ranges from `0' to `3', and indicates one of four
one-word arguments); `rtnval' (the procedure's result); or
`priv_lev' (privilege level). For arguments or the result, R
specifies how to relocate, and must be one of `no' (not
relocatable), `gr' (argument is in general register), `fr' (in
floating point register), or `fu' (upper half of float register).
For `priv_lev', R is an integer.
`.half N'
Define a two-byte integer constant N; synonym for the portable
`as' directive `.short'.
`.import NAME [ ,TYP ]'
Converse of `.export'; make a procedure available to call. The
arguments use the same conventions as the first two arguments for
`.export'.
`.label NAME'
Define NAME as a label for the current assembly location.
`.leave'
Not yet supported; the assembler rejects programs containing this
directive.
`.origin LC'
Advance location counter to LC. Synonym for the `{No value for
`as'}' portable directive `.org'.
`.param NAME [ ,TYP ] [ ,PARAM=R ]'
Similar to `.export', but used for static procedures.
`.proc'
Use preceding the first statement of a procedure.
`.procend'
Use following the last statement of a procedure.
`LABEL .reg EXPR'
Synonym for `.equ'; define LABEL with the absolute expression EXPR
as its value.
`.space SECNAME [ ,PARAMS ]'
Switch to section SECNAME, creating a new section by that name if
necessary. You may only use PARAMS when creating a new section,
not when switching to an existing one. SECNAME may identify a
section by number rather than by name.
If specified, the list PARAMS declares attributes of the section,
identified by keywords. The keywords recognized are `spnum=EXP'
(identify this section by the number EXP, an absolute expression),
`sort=EXP' (order sections according to this sort key when linking;
EXP is an absolute expression), `unloadable' (section contains no
loadable data), `notdefined' (this section defined elsewhere), and
`private' (data in this section not available to other programs).
`.spnum SECNAM'
Allocate four bytes of storage, and initialize them with the
section number of the section named SECNAM. (You can define the
section number with the HPPA `.space' directive.)
`.string "STR"'
Copy the characters in the string STR to the object file. Note:
Strings, for information on escape sequences you can use
in `as' strings.
_Warning!_ The HPPA version of `.string' differs from the usual
`as' definition: it does _not_ write a zero byte after copying STR.
`.stringz "STR"'
Like `.string', but appends a zero byte after copying STR to object
file.
`.subspa NAME [ ,PARAMS ]'
`.nsubspa NAME [ ,PARAMS ]'
Similar to `.space', but selects a subsection NAME within the
current section. You may only specify PARAMS when you create a
subsection (in the first instance of `.subspa' for this NAME).
If specified, the list PARAMS declares attributes of the
subsection, identified by keywords. The keywords recognized are
`quad=EXPR' ("quadrant" for this subsection), `align=EXPR'
(alignment for beginning of this subsection; a power of two),
`access=EXPR' (value for "access rights" field), `sort=EXPR'
(sorting order for this subspace in link), `code_only' (subsection
contains only code), `unloadable' (subsection cannot be loaded
into memory), `common' (subsection is common block), `dup_comm'
(initialized data may have duplicate names), or `zero' (subsection
is all zeros, do not write in object file).
`.nsubspa' always creates a new subspace with the given name, even
if one with the same name already exists.
`.version "STR"'
Write STR as version identifier in object code.
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