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Nelson Chu d3ffd7f776 RISC-V: Support new .option arch directive.
https://github.com/riscv/riscv-asm-manual/pull/67

Format:
.option arch, +<extension><version>, ...
.option arch, -<extension>
.option arch, =<ISA string>

The new direcitve is used to enable/disable extensions for the specific
code region.  For example,

.attribute arch, "rv64ic"   # arch = rv64i2p0_c2p0
.option push
.option arch, +d2p0, -c     # arch = rv64i2p0_f2p0_d2p0, f is added implied
.option arch, =rv32gc       # arch = rv32i2p0_m2p0_a2p0_f2p0_d2p0_c2p0
.option pop                 # arch = rv64i2p0_c2p0

Note that,
1. ".option rvc/norvc" have the same behavior as ".option arch +c/-c".
2. ".option arch -i" is illegal, since we cannot remove base i extension.
3. If arch=rv64i2p0, then ".option arch, +i3p0" will update the i's version
   from 2.0 to 3.0.
4. If arch=rv64i3p0, then ".option arch, +i" will update the i's version
   from 2.0 to the default one according to the chosen isa spec.

bfd/
	* elfxx-riscv.c (riscv_add_subset): If the subset is already added,
	and the new versions are not RISCV_UNKNOWN_VERSION, then update the
	versions to the subset list.
	(riscv_copy_subset): New function.  Copy the subset from list.
	(riscv_copy_subset_list): New function.  Return the new copyed list.
	(riscv_update_subset): Updated to make .option arch directives workable.
	* elfxx-riscv.h: Updated.
gas/
	* config/tc-riscv.c (riscv_subsets): Defined as a pointer.
	(riscv_rps_as): Init the subset_list to NULL, we will set it later
	once riscv_opts_stack is created or updated.
	(struct riscv_option_stack, riscv_opts_stack): Moved forward.
	(riscv_set_arch): Updated.
	(s_riscv_option): Support new .option arch directive, to add, remove
	or update subsets for the specific code region.
	(riscv_write_out_attrs): Updated.
	* doc/c-riscv.texi: Added document for new .option arch directive.
	* testsuite/gas/riscv/option-arch-01a.d: New testcase.
	* testsuite/gas/riscv/option-arch-01b.d: Likewise.
	* testsuite/gas/riscv/option-arch-01.s: Likewise..
	* testsuite/gas/riscv/option-arch-02.d: Likewise.
	* testsuite/gas/riscv/option-arch-02.s: Likewise.
	* testsuite/gas/riscv/option-arch-fail.d: Likewise.
	* testsuite/gas/riscv/option-arch-fail.l: Likewise.
	* testsuite/gas/riscv/option-arch-fail.s: Likewise.
2021-11-19 18:50:27 +08:00
bfd RISC-V: Support new .option arch directive. 2021-11-19 18:50:27 +08:00
binutils RISC-V: Support STO_RISCV_VARIANT_CC and DT_RISCV_VARIANT_CC. 2021-11-19 09:32:19 +08:00
config
contrib
cpu
elfcpp
etc
gas RISC-V: Support new .option arch directive. 2021-11-19 18:50:27 +08:00
gdb dprintf-execution-x-script.exp: Adjust test for native-extended-gdbserver 2021-11-18 15:38:34 -07:00
gdbserver Remove config.cache in gdbserver's "distclean" 2021-11-16 09:13:24 -07:00
gdbsupport gdbsupport: make gdb_assert_not_reached accept a format string 2021-11-18 11:29:19 -05:00
gnulib
gold -Waddress fixes for gold testsuite 2021-11-15 13:26:17 +10:30
gprof
include RISC-V: Support STO_RISCV_VARIANT_CC and DT_RISCV_VARIANT_CC. 2021-11-19 09:32:19 +08:00
intl Regenerate a couple of files 2021-11-15 12:20:12 +10:30
ld RISC-V: Support STO_RISCV_VARIANT_CC and DT_RISCV_VARIANT_CC. 2021-11-19 09:32:19 +08:00
libbacktrace sync libbacktrace from gcc 2021-11-14 18:07:50 +10:30
libctf doc/ctf-spec.texi: Remove "@validatemenus off" 2021-11-09 05:35:42 -08:00
libdecnumber
libiberty
opcodes Re: Don't compile some opcodes files when bfd is 32-bit only 2021-11-18 18:55:16 +10:30
readline
sim sim: install various doc files 2021-11-19 03:36:45 -05:00
texinfo
zlib
.cvsignore
.gitattributes
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ar-lib
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compile
config-ml.in
config.guess
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configure
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COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
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COPYING.NEWLIB
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djunpack.bat
install-sh
libtool.m4
lt~obsolete.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
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MAINTAINERS
Makefile.def Import Makefile.def from gcc 2021-11-12 19:02:12 +10:30
Makefile.in Sync Makefile.tpl with GCC 2021-11-13 09:04:03 -08:00
Makefile.tpl Sync Makefile.tpl with GCC 2021-11-13 09:04:03 -08:00
makefile.vms
missing
mkdep
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src-release.sh
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ylwrap

		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.