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Thomas Preud'homme c168ce07e5 [ARM] Keep separation between extensions and architecture bits throughout execution 
=== Context ===

This patch is part of a patch series to add support for ARMv8-R
architecture. Its purpose is to keep the distinction between
architecture feature bits and extension ones after parsing has occured.

=== Motivation ===

This distinction is necessary to allow the Tag_CPU_arch build attribute
value to be exactly as per the architecture of the selected CPU. With
mixed architecture and extension feature bit, it is impossible to find
an architecture with an exact match of feature bit and the build
attribute value logic must then select the closest match which might not
be the right architecture. The previous patch in the patch series makes
the distinction possible when parsing -mcpu and .cpu directives but the
distinction gets lost after. Similarly feature bits contributed by
extensions in -march or .arch_extensions directive are mixed together
with architecture extensions.

=== Patch description ===

The patch adds new feature bit pointer for extension feature bits.
Information from the parsing regarding extensions can then be kept
separate in those. This requires adapting arm_parse_extension to deal
with two feature bits, allowing the architecture bits to be marked as
const. It also requires extra care when setting cpu_variant and
selected_cpu because the extension bits are optional since there might
not be any extension in use.

Note that contrary to cpu feature bits, the extension feature bits are
made read/write and are always dynamically allocated. This allows to
unconditionally free them in arm_md_post_relax added for this occasion,
thereby fixing a longstanding memory leak when arm_parse_extension was
invoked (XNEW of ext_fset without corresponding XDELETE).
Introduction of arm_md_post_relax is necessary to only free the
extension feature bits after aeabi_set_attribute_string has been called
for the last time.

2017-06-21  Thomas Preud'homme  <thomas.preudhomme@arm.com>

gas/
	* config/tc-arm.c (dyn_mcpu_ext_opt): New static variable.
	(dyn_march_ext_opt): Likewise.
	(md_begin): Copy extension feature bits alongside architecture ones.
	Merge extensions feature bits in selected_cpu and cpu_variant if there
	is some.
	(arm_parse_extension): Pass architecture and extension feature bits in
	separate parameters, with architecture bits being read only.  Update
	**opt_p directly rather than *ext_set and initialize it if needed.
	(arm_parse_cpu): Stop merging architecture and extension feature bits
	and instead use mcpu_cpu_opt and dyn_mcpu_ext_opt to memorize them
	respectively.  Adapt to change in parameters of arm_parse_extension.
	(arm_parse_arch): Adapt to change in parameters of arm_parse_extension.
	(aeabi_set_attribute_string): Make function static.
	(arm_md_post_relax): New function.
	(s_arm_cpu): Stop merging architecture and extension feature bits and
	instead use mcpu_cpu_opt and dyn_mcpu_ext_opt to memorize them
	respectively.  Merge extension feature bits in cpu_variant
	if there is any.
	(s_arm_arch): Reset extension feature bit.  Set selected_cpu from
	*mcpu_cpu_opt and cpu_variant from selected_cpu and *mfpu_opt for
	consistency with s_arm_cpu.
	(s_arm_arch_extension): Update *dyn_mcpu_ext_opt rather than
	selected_cpu, allocating it before hand if needed.  Set selected_cpu
	from it and then cpu_variant.
	(s_arm_fpu): Merge *mcpu_ext_opt feature bits if any in cpu_variant.
	* config/tc-arm.h (md_post_relax_hook): Set to arm_md_post_relax.
	(aeabi_set_public_attributes): Delete external declaration.
	(arm_md_post_relax): Declare externally.
2017-06-21 14:11:14 +01:00
..
config [ARM] Keep separation between extensions and architecture bits throughout execution 2017-06-21 14:11:14 +01:00
doc Add support for the Cortex-A55 and Cortex-A75 versions of the AArch64 architecture. 2017-06-21 09:13:25 +01:00
po Add support for the WebAssembly file format and the wasm32 ELF conversion to gas and the binutils. 2017-03-30 10:57:21 +01:00
testsuite i386-dis: Add 2 tests with invalid bnd register 2017-06-15 08:21:48 -07:00
.gitignore
acinclude.m4
aclocal.m4
app.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
as.c Catch gas exit-via-signal 2017-01-18 08:23:10 -05:00
as.h Catch gas exit-via-signal 2017-01-18 08:23:10 -05:00
asintl.h Fix spelling mistakes and typos in the GAS sources. 2017-01-23 15:23:07 +00:00
atof-generic.c Fix spelling mistakes and typos in the GAS sources. 2017-01-23 15:23:07 +00:00
bignum.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
bit_fix.h Fix spelling mistakes and typos in the GAS sources. 2017-01-23 15:23:07 +00:00
cgen.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
cgen.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
ChangeLog [ARM] Keep separation between extensions and architecture bits throughout execution 2017-06-21 14:11:14 +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
ChangeLog-2016 ChangeLog rotation 2017-01-02 13:55:05 +10:30
ChangeLog-9295
ChangeLog-9697
ChangeLog-9899
compress-debug.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
compress-debug.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
cond.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
config.in Catch gas exit-via-signal 2017-01-18 08:23:10 -05:00
configure [AArch64, gas] Support ILP32 triplet aarch64*-linux-gnu_ilp32 2017-05-22 13:27:11 +01:00
configure.ac [AArch64, gas] Support ILP32 triplet aarch64*-linux-gnu_ilp32 2017-05-22 13:27:11 +01:00
configure.com Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
configure.tgt [AArch64, gas] Support ILP32 triplet aarch64*-linux-gnu_ilp32 2017-05-22 13:27:11 +01:00
CONTRIBUTORS Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
COPYING
debug.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
dep-in.sed
depend.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
dw2gencfi.c dw2gencfi.c DWARF2_FDE_RELOC_SIZE 2017-03-06 20:43:45 +10:30
dw2gencfi.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
dwarf2dbg.c gas: Emit name, comp_dir and producer strings in .debug_str. 2017-03-05 23:37:54 +01:00
dwarf2dbg.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
ecoff.c GAS: Consistently fix labels at the `.end' pseudo-op 2017-02-22 18:15:33 +00:00
ecoff.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
ehopt.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
emul-target.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
emul.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
expr.c gas: require an operand to .startof.()/.sizeof.() 2017-02-22 10:37:52 +01:00
expr.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
flonum-copy.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
flonum-konst.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
flonum-mult.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
flonum.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
frags.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
frags.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
gdbinit.in
hash.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
hash.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
input-file.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
input-file.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
input-scrub.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
itbl-lex-wrapper.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
itbl-lex.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
itbl-lex.l Add support for processing lex source files with flex v 2.6.3 2017-01-18 13:38:27 +00:00
itbl-ops.c Fix spelling mistakes and typos in the GAS sources. 2017-01-23 15:23:07 +00:00
itbl-ops.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
itbl-parse.y Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
listing.c Fix spelling mistakes and typos in the GAS sources. 2017-01-23 15:23:07 +00:00
listing.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
literal.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
macro.c Fix spelling mistakes and typos in the GAS sources. 2017-01-23 15:23:07 +00:00
macro.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
MAINTAINERS Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
Makefile.am Add support for the WebAssembly file format and the wasm32 ELF conversion to gas and the binutils. 2017-03-30 10:57:21 +01:00
Makefile.in Add support for the WebAssembly file format and the wasm32 ELF conversion to gas and the binutils. 2017-03-30 10:57:21 +01:00
makefile.vms Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
messages.c Catch gas exit-via-signal 2017-01-18 08:23:10 -05:00
NEWS Support ELF SHF_GNU_MBIND and PT_GNU_MBIND_XXX 2017-04-04 09:06:04 -07:00
obj.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
output-file.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
output-file.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
read.c Fix spelling mistakes and typos in the GAS sources. 2017-01-23 15:23:07 +00:00
read.h Prevent internal assembler errors if a stabs creation function builds an badly formatted input string. 2017-01-12 14:56:13 +00:00
README Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
remap.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
sb.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
sb.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
stabs.c Prevent internal assembler errors if a stabs creation function builds an badly formatted input string. 2017-01-12 14:56:13 +00:00
stamp-h.in
struc-symbol.h Fix spelling mistakes and typos in the GAS sources. 2017-01-23 15:23:07 +00:00
subsegs.c Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
subsegs.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
symbols.c Prevent a seg-fault in the assembler when provided with a bogus input source file. 2017-05-03 09:52:01 +01:00
symbols.h Fix spelling mistakes and typos in the GAS sources. 2017-01-23 15:23:07 +00:00
tc.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
write.c Allow target files access to default TC_FORCE_RELOCATION defines 2017-05-16 10:35:02 +09:30
write.h Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30

README

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

		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) 2012-2017 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.