(1) summary descriptions of HPPA-specific directives
(2) leading comments for future updates, about places to check for new
directives
(3) doc for new portable ".string" directive
(4) minor updates to dates etc.
This commit is contained in:
Roland Pesch
parent
74557dc6bb
commit
e680d73781
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@ -1,5 +1,13 @@
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\input texinfo @c -*-Texinfo-*-
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@c Copyright (c) 1991 1992 1993 Free Software Foundation, Inc.
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@c Copyright (c) 1991 1992 1993 1994 Free Software Foundation, Inc.
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@c UPDATE!! On future updates--
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@c (1) check for new machine-dep cmdline options in
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@c md_parse_option definitions in config/tc-*.c
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@c (2) for platform-specific directives, examine md_pseudo_op
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@c in config/tc-*.c
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@c (3) for object-format specific directives, examine obj_pseudo_op
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@c in config/obj-*.c
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@c (4) portable directives in potable[] in read.c
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@c %**start of header
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@setfilename as.info
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@c ---config---
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@ -51,7 +59,7 @@ END-INFO-DIR-ENTRY
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@ifinfo
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This file documents the GNU Assembler "@value{AS}".
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Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
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Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
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Permission is granted to make and distribute verbatim copies of
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this manual provided the copyright notice and this permission notice
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@ -85,7 +93,7 @@ instead of in the original English.
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@subtitle for the @value{TARGET} family
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@end ifclear
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@sp 1
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@subtitle March 1993
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@subtitle January 1994
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@sp 1
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@sp 13
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The Free Software Foundation Inc. thanks The Nice Computer
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@ -111,7 +119,7 @@ done.
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@end tex
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@vskip 0pt plus 1filll
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Copyright @copyright{} 1991, 1992, 1993 Free Software Foundation, Inc.
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Copyright @copyright{} 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
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Permission is granted to make and distribute verbatim copies of
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this manual provided the copyright notice and this permission notice
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@ -2657,6 +2665,8 @@ Some machine configurations provide additional directives.
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@ifset have-stabs
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* Stab:: @code{.stabd, .stabn, .stabs}
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@end ifset
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* String:: @code{.string "@var{str}"}
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@ifset COFF
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* Tag:: @code{.tag @var{structname}}
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@end ifset
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@ -3012,8 +3022,9 @@ Both spellings (@samp{.globl} and @samp{.global}) are accepted, for
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compatibility with other assemblers.
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@ifset HPPA
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On the HPPA symbols are made visible to @code{@value{LD}} with the
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@code{.EXPORT} directive.
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On the HPPA, @code{.global} is not always enough to make it accessible to other
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partial programs. You may need the HPPA-only @code{.EXPORT} directive as well.
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@xref{HPPA Directives,, HPPA Assembler Directives}.
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@end ifset
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@node hword
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@ -3487,9 +3498,10 @@ and @var{fill} are omitted, @var{fill} is assumed to be zero.
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@ifset HPPA
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@quotation
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@emph{Warning:} @code{.space} has a completely different meaning for HPPA
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targets; use @code{.block} as a substitute. See @cite{HP9000 Series 800
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Assembly Language Reference Manual} (HP 92432-90001) for the meaning of
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the @code{.space} directive.
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targets; use @code{.block} as a substitute. See @cite{HP9000 Series 800
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Assembly Language Reference Manual} (HP 92432-90001) for the meaning of the
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@code{.space} directive. @xref{HPPA Directives,,HPPA Assembler Directives},
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for a summary.
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@end quotation
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@end ifset
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@end ifclear
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@ -3575,6 +3587,16 @@ All five fields are specified.
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@end ifset
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@c end have-stabs
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@node String
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@section @code{.string} "@var{str}"
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@cindex string, copying to object file
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@cindex @code{string} directive
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Copy the characters in @var{str} to the object file. You may specify more than
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one string to copy, separated by commas. Unless otherwise specified for a
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particular machine, the assembler marks the end of each string with a 0 byte.
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@ifset COFF
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@node Tag
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@section @code{.tag @var{structname}}
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@ -4986,27 +5008,182 @@ Since @samp{$} has no special meaning, you may use it in symbol names.
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The HPPA family uses @sc{ieee} floating-point numbers.
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@node HPPA Directives
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@section HPPA Machine Directives
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For detailed information on the HPPA machine instruction set, see
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@cite{HP9000 Series 800 Assembly Language Reference Manual}
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(HP 92432-90001).
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@section HPPA Assembler Directives
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@code{@value{AS}} does not support the following assembler directives
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found in the HP manual:
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@itemize @bullet
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@item endm
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@item enter
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@item leave
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@item listoff
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@item liston
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@item locct
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@item macro
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@end itemize
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@code{@value{AS}} for the HPPA supports many additional directives for
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compatibility with the native assembler. This section describes them only
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briefly. For detailed information on HPPA-specific assembler directives, see
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@cite{HP9000 Series 800 Assembly Language Reference Manual} (HP 92432-90001).
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@cindex @code{.PARAM} on HPPA
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@code{@value{AS}} supports one additional assembler directive for the
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HPPA: @code{.PARAM}. It conveys register argument locations for
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static functions. Its syntax closely follows the @code{.EXPORT} directive.
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@cindex HPPA directives not supported
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@code{@value{AS}} does @emph{not} support the following assembler directives
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described in the HP manual:
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@example
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endm liston
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enter locct
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leave macro
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listoff
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@end example
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@cindex @code{.param} on HPPA
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Beyond those implemented for compatibility, @code{@value{AS}} supports one
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additional assembler directive for the HPPA: @code{.param}. It conveys
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register argument locations for static functions. Its syntax closely follows
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the @code{.export} directive.
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@cindex HPPA-only directives
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These are the additional directives in @code{@value{AS}} for the HPPA:
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@table @code
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@item .block @var{n}
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@itemx .blockz @var{n}
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Reserve @var{n} bytes of storage, and initialize them to zero.
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@item .call
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Mark the beginning of a procedure call. Only the special case with @emph{no
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arguments} is allowed.
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@item .callinfo [ @var{param}=@var{value}, @dots{} ] [ @var{flag}, @dots{} ]
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Specify a number of parameters and flags that define the environment for a
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procedure.
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@var{param} may be any of @samp{frame} (frame size), @samp{entry_gr} (end of
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general register range), @samp{entry_fr} (end of float register range),
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@samp{entry_sr} (end of space register range).
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The values for @var{flag} are @samp{calls} or @samp{caller} (proc has
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subroutines), @samp{no_calls} (proc does not call subroutines), @samp{save_rp}
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(preserve return pointer), @samp{save_sp} (proc preserves stack pointer),
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@samp{no_unwind} (do not unwind this proc), @samp{hpux_int} (proc is interrupt
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routine).
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@item .code
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@c ??? Not in HP manual
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Assemble into the code section.
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@ifset SOM
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@item .copyright "@var{string}"
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In the SOM object format, insert @var{string} into the object code, marked as a
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copyright string.
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@end ifset
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@ifset ELF
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@item .copyright "@var{string}"
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In the ELF object format, insert @var{string} into the object code, marked as a
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version string.
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@end ifset
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@item .enter
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Not yet supported; the assembler rejects programs containing this directive.
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@item .entry
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Mark the beginning of a procedure.
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@item .exit
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Mark the end of a procedure.
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@item .export @var{name} [ ,@var{typ} ] [ ,@var{param}=@var{r} ]
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Make a procedure @var{name} available to callers. @var{typ}, if present, must
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be one of @samp{absolute}, @samp{code} (ELF only, not SOM), @samp{data},
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@samp{entry}, @samp{data}, @samp{entry}, @samp{millicode}, @samp{plabel},
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@samp{pri_prog}, or @samp{sec_prog}.
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@var{param}, if present, provides either relocation information for the
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procedure arguments and result, or a privilege level. @var{param} may be
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@samp{argw@var{n}} (where @var{n} ranges from @code{0} to @code{3}, and
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indicates one of four one-word arguments); @samp{rtnval} (the procedure's
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result); or @samp{priv_lev} (privilege level). For arguments or the result,
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@var{r} specifies how to relocate, and must be one of @samp{no} (not
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relocatable), @samp{gr} (argument is in general register), @samp{fr} (in
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floating point register), or @samp{fu} (upper half of float register).
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For @samp{priv_lev}, @var{r} is an integer.
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@item .half @var{n}
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@c ?? Not in HP manual
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Define a two-byte integer constant @var{n}; synonym for the portable
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@code{@value{AS}} directive @code{.short}.
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@item .import @var{name} [ ,@var{typ} ]
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Converse of @code{.export}; make a procedure available to call. The arguments
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use the same conventions as the first two arguments for @code{.export}.
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@item .label @var{name}
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Define @var{name} as a label for the current assembly location.
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@item .leave
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@c ?? Not in HP manual
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Not yet supported; the assembler rejects programs containing this directive.
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@item .origin @var{lc}
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Advance location counter to @var{lc}. Synonym for the @code{@value{as}}
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portable directive @code{.org}.
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@item .param @var{name} [ ,@var{typ} ] [ ,@var{param}=@var{r} ]
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@c Not in HP manual
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Similar to @code{.export}, but used for static procedures.
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@item .proc
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Use preceding the first statement of a procedure.
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@item .procend
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Use following the last statement of a procedure.
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@item @var{label} .reg @var{expr}
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@c ?? Not in HP manual
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Synonym for @code{.equ}; define @var{label} with the absolute expression
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@var{expr} as its value.
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@item .space @var{secname}
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Switch to section @var{secname}, creating a new section by that name if
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necessary. You may only use @var{keywords} when creating a new section, not
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when switching to an existing one. @var{secname} may identify a section by
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number rather than by name.
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@c FIXME! Shouldn't there be optional parameters the first time? I don't see
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@c provision for them in pa_space.
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@ignore
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@item .spnum
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@c ?? Not in HP manual
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FIXME--- Comments in source indicate directive not well understood.
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@end ignore
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@item .string "@var{str}"
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@cindex @code{string} directive on HPPA
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Copy the characters in @var{str} to the object file, after converting some
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@samp{\@var{x}} escape sequences to single characters. Use @samp{\x@var{dd}}
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to refer to a character in hexadecimal.
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@c FIXME! Is that all? HP manual mentions more, which I don't see in
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@c pa_stringer.
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@emph{Warning!} The HPPA version of @code{.string} differs in two ways from the
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usual @code{@value{AS}} definition. First, it performs @samp{\} escape
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preprocessing, as described above; second, it does @emph{not} write a zero byte
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after copying @var{str}.
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@item .stringz "@var{str}"
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Like @code{.string}, but appends a zero byte after copying @var{str} to object
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file.
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@item .subspa @var{name} [ ,@var{params} ]
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Similar to @code{.space}, but selects a subsection @var{name} within the
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current section. You may only specify @var{params} when you create a
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subsection (in the first instance of @code{.subspa} for this @var{name}).
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If specified, @var{params} declare attributes of the subsection, identified by
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keywords. The keywords recognized are @samp{quad=@var{expr}} (``quadrant'' for
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this subsection), @samp{align=@var{expr}} (alignment for beginning of this
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subsection; a power of two), @samp{access=@var{expr}} (value for ``access
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rights'' field), @samp{sort=@var{expr}} (sorting order for this subspace in
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link), @samp{code_only} (subsection contains only code), @samp{unloadable}
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@c ?!
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(subsection cannot be loaded into memory), @samp{common} (subsection is common
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block), @samp{dup_comm} (initialized data may have duplicate names),
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or @samp{zero} (subsection is all zeros, do not write in object file).
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@item .version "@var{str}"
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Write @var{str} as version identifier in object code.
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@end table
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@node HPPA Opcodes
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@section Opcodes
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@ -6957,7 +7134,7 @@ described elsewhere in this manual.
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If you have contributed to @code{@value{AS}} and your name isn't listed here,
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it is not meant as a slight. We just don't know about it. Send mail to the
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maintainer, and we'll correct the situation. Currently (June 1993), the
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maintainer, and we'll correct the situation. Currently (January 1994), the
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maintainer is Ken Raeburn (email address @code{raeburn@@cygnus.com}).
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Dean Elsner wrote the original GNU assembler for the VAX.@footnote{Any more
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