binutils-gdb/gas
Richard Sandiford e1b988bba6 [AArch64][SVE 11/32] Tweak aarch64_reg_parse_32_64 interface
aarch64_reg_parse_32_64 is currently used to parse address registers,
among other things.  It returns two bits of information about the
register: whether it's W rather than X, and whether it's a zero register.

SVE adds addressing modes in which the base or offset can be a vector
register instead of a scalar, so a choice between W and X is no longer
enough.  It's more convenient to pass the type of register around as
a qualifier instead.

As it happens, two callers of aarch64_reg_parse_32_64 already wanted
the information in the form of a qualifier, so the change feels pretty
natural even without SVE.

Also, the function took two parameters to control whether {W}SP
and (W|X)ZR should be accepted.  We tend to get slightly better
error messages by accepting them regardless and getting the caller
to do the check, rather than potentially treating "xzr", "sp" etc.
as constants.  This is easier to do if the function returns the
reg_entry rather than just the register number.

This does create a corner case where:

	.equ	sp, 1
	ldr	w0, [x0, sp]

was previously an acceptable way of writing "ldr w0, [x0, #1]",
but I don't think it's important to continue supporting that.
We already rejected things like:

	.equ	sp, 1
	add	x0, x1, sp

To ensure these new error messages "win" when matching against
several candidate instruction entries, we need to use the same
address-parsing code for all addresses, including ADDR_SIMPLE
and SIMD_ADDR_SIMPLE.  The next patch also relies on this.

Finally, aarcch64_check_reg_type was written in a pretty
conservative way.  It should always be equivalent to a single
bit test.

gas/
	* config/tc-aarch64.c (REG_TYPE_R_Z, REG_TYPE_R_SP): New register
	types.
	(get_reg_expected_msg): Handle them and REG_TYPE_R64_SP.
	(aarch64_check_reg_type): Simplify.
	(aarch64_reg_parse_32_64): Return the reg_entry instead of the
	register number.  Return the type as a qualifier rather than an
	"isreg32" boolean.  Remove reject_sp, reject_rz and isregzero
	parameters.
	(parse_shifter_operand): Update call to aarch64_parse_32_64_reg.
	Use get_reg_expected_msg.
	(parse_address_main): Likewise.  Use aarch64_check_reg_type.
	(po_int_reg_or_fail): Replace reject_sp and reject_rz parameters
	with a reg_type parameter.  Update call to aarch64_parse_32_64_reg.
	Use aarch64_check_reg_type to test the result.
	(parse_operands): Update after the above changes.  Parse ADDR_SIMPLE
	addresses normally before enforcing the syntax restrictions.
	* testsuite/gas/aarch64/diagnostic.s: Add tests for a post-index
	zero register and for a stack pointer index.
	* testsuite/gas/aarch64/diagnostic.l: Update accordingly.
	Also update existing diagnostic messages after the above changes.
	* testsuite/gas/aarch64/illegal-lse.l: Update the error message
	for 32-bit register bases.
2016-09-21 16:49:24 +01:00
..
config [AArch64][SVE 11/32] Tweak aarch64_reg_parse_32_64 interface 2016-09-21 16:49:24 +01:00
doc gas: detect DCTI couples in sparc 2016-09-14 07:10:49 -07:00
po Copyright update for binutils 2016-01-01 23:00:01 +10:30
testsuite [AArch64][SVE 11/32] Tweak aarch64_reg_parse_32_64 interface 2016-09-21 16:49:24 +01:00
.gitignore
acinclude.m4
aclocal.m4 Regenerate Makefile.in/aclocal.m4 automake 1.11.6 2016-04-15 16:20:55 -07:00
app.c use XNEW and related macros more 2016-05-13 00:35:51 -04:00
as.c Allow ARC target to be configured with --with-cpu=<cpu-name>. 2016-06-30 11:14:41 +01:00
as.h Add command line option to stop the assembler from padding the end of sections to their alignment boundary. 2016-06-27 13:51:06 +01:00
asintl.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
atof-generic.c Remove use of alloca. 2016-03-21 16:31:46 +00:00
bignum.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
bit_fix.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
cgen.c use XNEW and related macros more 2016-05-13 00:35:51 -04:00
cgen.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
ChangeLog [AArch64][SVE 11/32] Tweak aarch64_reg_parse_32_64 interface 2016-09-21 16:49:24 +01:00
ChangeLog-0001
ChangeLog-0203
ChangeLog-2004
ChangeLog-2005
ChangeLog-2006
ChangeLog-2007
ChangeLog-2008
ChangeLog-2009
ChangeLog-2010
ChangeLog-2011
ChangeLog-2012
ChangeLog-2013
ChangeLog-2014
ChangeLog-2015 binutils ChangeLog rotation 2016-01-01 22:59:17 +10:30
ChangeLog-9295
ChangeLog-9697
ChangeLog-9899
compress-debug.c Copyright update for binutils 2016-01-01 23:00:01 +10:30
compress-debug.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
cond.c Add more const type qualifiers to GAS sources. 2016-02-22 14:11:27 +00:00
config.in Allow ARC target to be configured with --with-cpu=<cpu-name>. 2016-06-30 11:14:41 +01:00
configure Set BFD_VERSION to 2.27.51 2016-07-21 15:22:13 -07:00
configure.ac Allow ARC target to be configured with --with-cpu=<cpu-name>. 2016-06-30 11:14:41 +01:00
configure.com Copyright update for binutils 2016-01-01 23:00:01 +10:30
configure.tgt Default to --enable-compressed-debug-sections=gas for Linux/x86 2016-06-29 09:32:34 -07:00
CONTRIBUTORS Copyright update for binutils 2016-01-01 23:00:01 +10:30
COPYING
debug.c Copyright update for binutils 2016-01-01 23:00:01 +10:30
dep-in.sed
depend.c use XNEW and related macros more 2016-04-03 20:43:23 -04:00
dw2gencfi.c use XNEW and related macros more 2016-05-13 00:35:51 -04:00
dw2gencfi.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
dwarf2dbg.c use XNEW and related macros more 2016-05-13 00:35:51 -04:00
dwarf2dbg.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
ecoff.c use XNEW and related macros more 2016-05-13 00:35:51 -04:00
ecoff.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
ehopt.c Copyright update for binutils 2016-01-01 23:00:01 +10:30
emul-target.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
emul.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
expr.c use xstrdup, xmemdup0 and concat more 2016-05-13 00:35:51 -04:00
expr.h Add more const type qualifiers to GAS sources. 2016-02-22 14:11:27 +00:00
flonum-copy.c Copyright update for binutils 2016-01-01 23:00:01 +10:30
flonum-konst.c Copyright update for binutils 2016-01-01 23:00:01 +10:30
flonum-mult.c Copyright update for binutils 2016-01-01 23:00:01 +10:30
flonum.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
frags.c Add more const type qualifiers to GAS sources. 2016-02-22 14:11:27 +00:00
frags.h Add more const type qualifiers to GAS sources. 2016-02-22 14:11:27 +00:00
gdbinit.in
hash.c use XNEW and related macros more 2016-04-03 20:43:23 -04:00
hash.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
input-file.c use XNEW and related macros more 2016-04-03 20:43:23 -04:00
input-file.h Add more const type qualifiers to GAS sources. 2016-02-22 14:11:27 +00:00
input-scrub.c use XNEW and related macros more 2016-05-13 00:35:51 -04:00
itbl-lex-wrapper.c Copyright update for binutils 2016-01-01 23:00:01 +10:30
itbl-lex.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
itbl-lex.l Copyright update for binutils 2016-01-01 23:00:01 +10:30
itbl-ops.c use XNEW and related macros more 2016-05-13 00:35:51 -04:00
itbl-ops.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
itbl-parse.y fixup another old style function definition 2016-06-05 23:49:03 -04:00
listing.c use XNEW and related macros more 2016-05-13 00:35:51 -04:00
listing.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
literal.c get rid of K&R style args 2016-03-31 01:04:00 -04:00
macro.c Fix potential buffer overflows with sprintf and very large integer values. 2016-07-01 12:35:01 +01:00
macro.h Add more const type qualifiers to GAS sources. 2016-02-22 14:11:27 +00:00
MAINTAINERS Copyright update for binutils 2016-01-01 23:00:01 +10:30
Makefile.am Don't include libbfd.h outside of bfd, part 1 2016-07-16 13:25:11 +09:30
Makefile.in Don't include libbfd.h outside of bfd, part 1 2016-07-16 13:25:11 +09:30
makefile.vms Copyright update for binutils 2016-01-01 23:00:01 +10:30
messages.c GAS: Fix a typo in `as_bad' description 2016-04-09 13:22:54 +01:00
NEWS Add marker for 2.27 branch. 2016-07-01 10:58:29 +02:00
obj.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
output-file.c Add more const type qualifiers to GAS sources. 2016-02-22 14:11:27 +00:00
output-file.h Add more const type qualifiers to GAS sources. 2016-02-22 14:11:27 +00:00
read.c PR19896, Segmentation fault on bad input 2016-04-02 17:31:36 +10:30
read.h Add const qualifiers at various places. 2016-03-07 15:16:28 +00:00
README Copyright update for binutils 2016-01-01 23:00:01 +10:30
remap.c use XNEW and related macros more 2016-04-03 20:43:23 -04:00
sb.c replace some raw xmalloc / xrealloc with the XNEW* macros 2016-03-22 19:06:39 -04:00
sb.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
stabs.c use XNEW and related macros more 2016-05-13 00:35:51 -04:00
stamp-h.in
struc-symbol.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
subsegs.c use XNEW and related macros more 2016-05-13 00:35:51 -04:00
subsegs.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
symbols.c use XNEW and related macros more 2016-05-13 00:35:51 -04:00
symbols.h Copyright update for binutils 2016-01-01 23:00:01 +10:30
tc.h cleanup FLT_CHARS and EXP_CHARS 2016-04-03 19:50:02 -04:00
write.c PR gas/20312: Do not pad sections to alignment on failed assembly 2016-06-30 15:11:23 +01:00
write.h Add more const type qualifiers to GAS sources. 2016-02-22 14:11:27 +00:00

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		README for GAS

A number of things have changed since version 1 and the wonderful
world of gas looks very different.  There's still a lot of irrelevant
garbage lying around that will be cleaned up in time.  Documentation
is scarce, as are logs of the changes made since the last gas release.
My apologies, and I'll try to get something useful.

Unpacking and Installation - Summary
====================================

See ../binutils/README.

To build just the assembler, make the target all-gas.

Documentation
=============

The GAS release includes texinfo source for its manual, which can be processed
into `info' or `dvi' forms.

The DVI form is suitable for printing or displaying; the commands for doing
this vary from system to system.  On many systems, `lpr -d' will print a DVI
file.  On others, you may need to run a program such as `dvips' to convert the
DVI file into a form your system can print.

If you wish to build the DVI file, you will need to have TeX installed on your
system.  You can rebuild it by typing:

	cd gas/doc
	make as.dvi

The Info form is viewable with the GNU Emacs `info' subsystem, or the
stand-alone `info' program, available as part of the GNU Texinfo distribution.
To build the info files, you will need the `makeinfo' program.  Type:

	cd gas/doc
	make info

Specifying names for hosts and targets
======================================

   The specifications used for hosts and targets in the `configure'
script are based on a three-part naming scheme, but some short
predefined aliases are also supported.  The full naming scheme encodes
three pieces of information in the following pattern:

     ARCHITECTURE-VENDOR-OS

   For example, you can use the alias `sun4' as a HOST argument or in a
`--target=TARGET' option.  The equivalent full name is
`sparc-sun-sunos4'.

   The `configure' script accompanying GAS does not provide any query
facility to list all supported host and target names or aliases.
`configure' calls the Bourne shell script `config.sub' to map
abbreviations to full names; you can read the script, if you wish, or
you can use it to test your guesses on abbreviations--for example:

     % sh config.sub i386v
     i386-unknown-sysv
     % sh config.sub i786v
     Invalid configuration `i786v': machine `i786v' not recognized


`configure' options
===================

   Here is a summary of the `configure' options and arguments that are
most often useful for building GAS.  `configure' also has several other
options not listed here.

     configure [--help]
               [--prefix=DIR]
               [--srcdir=PATH]
               [--host=HOST]
               [--target=TARGET]
               [--with-OPTION]
               [--enable-OPTION]

You may introduce options with a single `-' rather than `--' if you
prefer; but you may abbreviate option names if you use `--'.

`--help'
     Print a summary of the options to `configure', and exit.

`-prefix=DIR'
     Configure the source to install programs and files under directory
     `DIR'.

`--srcdir=PATH'
     Look for the package's source code in directory DIR.  Usually
     `configure' can determine that directory automatically.

`--host=HOST'
     Configure GAS to run on the specified HOST.  Normally the
     configure script can figure this out automatically.

     There is no convenient way to generate a list of all available
     hosts.

`--target=TARGET'
     Configure GAS for cross-assembling programs for the specified
     TARGET.  Without this option, GAS is configured to assemble .o files
     that run on the same machine (HOST) as GAS itself.

     There is no convenient way to generate a list of all available
     targets.

`--enable-OPTION'
     These flags tell the program or library being configured to
     configure itself differently from the default for the specified
     host/target combination.  See below for a list of `--enable'
     options recognized in the gas distribution.

`configure' accepts other options, for compatibility with configuring
other GNU tools recursively; but these are the only options that affect
GAS or its supporting libraries.

The `--enable' options recognized by software in the gas distribution are:

`--enable-targets=...'
     This causes one or more specified configurations to be added to those for
     which BFD support is compiled.  Currently gas cannot use any format other
     than its compiled-in default, so this option is not very useful.

`--enable-bfd-assembler'
     This causes the assembler to use the new code being merged into it to use
     BFD data structures internally, and use BFD for writing object files.
     For most targets, this isn't supported yet.  For most targets where it has
     been done, it's already the default.  So generally you won't need to use
     this option.

Compiler Support Hacks
======================

On a few targets, the assembler has been modified to support a feature
that is potentially useful when assembling compiler output, but which
may confuse assembly language programmers.  If assembler encounters a
.word pseudo-op of the form symbol1-symbol2 (the difference of two
symbols), and the difference of those two symbols will not fit in 16
bits, the assembler will create a branch around a long jump to
symbol1, and insert this into the output directly before the next
label: The .word will (instead of containing garbage, or giving an
error message) contain (the address of the long jump)-symbol2.  This
allows the assembler to assemble jump tables that jump to locations
very far away into code that works properly.  If the next label is
more than 32K away from the .word, you lose (silently); RMS claims
this will never happen.  If the -K option is given, you will get a
warning message when this happens.


REPORTING BUGS IN GAS
=====================

Bugs in gas should be reported to:

   bug-binutils@gnu.org.

They may be cross-posted to gcc-bugs@gnu.org if they affect the use of
gas with gcc.  They should not be reported just to gcc-bugs, since not
all of the maintainers read that list.

See ../binutils/README for what we need in a bug report.

Copyright (C) 2012-2016 Free Software Foundation, Inc.

Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.