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The existing iclass information tells us the general shape and purpose
of the instructions. In some cases, however, we need to further disect
the iclass on the basis of other finer-grain information. E.g., for the
purpose of SCFI, we need to know whether a given insn with iclass
of ldst_* is a load or a store.
At the moment, specify subclasses for only those iclasses relevant to
SCFI: ldst_imm9, ldst_pos, ldstpair_indexed, ldstpair_off and
ldstnapair_offs.
Some insns are best tagged with F_SUBCLASS_OTHER rather than F_LDST_LOAD
or F_LDST_STORE:
- stg* ops (as they store tag only),
- prfm,
- ldpsw, ldrsw (32-bit loads with signed extended value. Not useful
for restore operations in context of SCFI.)
- Use F_SUBCLASS_OTHER for all QL_LDST_R8 and QL_LDST_R16 operands.
Also use F_SUBLASS_OTHER for strb/ldrb, strh/ldrh opcodes.
These are not full loads and stores and cannot be allowed for
register save / restore for the purpose of SCFI.
opcodes/
* aarch64-tbl.h: Use the new F_LDST_* flags.
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The existing iclass information tells us the general shape and purpose
of the instructions. In some cases, however, we need to further disect
the iclass on the basis of other finer-grain information. E.g., for the
purpose of SCFI, we need to know whether a given insn with iclass of
ldst_* is a load or a store. Similarly, whether a particular arithmetic
insn is an add or sub or mov, etc.
This patch defines new flags to demarcate the insns. Also provide an
access function for subclass lookup.
Later, we will enforce (in aarch64-gen.c) that if an iclass has at least
one instruction with a non-zero subclass, all instructions of the iclass
must have a non-zero subclass information. If none of the defined
subclasses are applicable (or not required for SCFI purposes),
F_SUBCLASS_OTHER can be used for such instructions.
include/
* opcode/aarch64.h (F_SUBCLASS): New flag.
(F_SUBCLASS_OTHER): Likewise.
(F_LDST_LOAD): Likewise.
(F_LDST_STORE): Likewise.
(F_ARITH_ADD): Likewise.
(F_ARITH_SUB): Likewise.
(F_ARITH_MOV): Likewise.
(F_BRANCH_CALL): Likewise.
(F_BRANCH_RET): Likewise.
(F_DP_TAG_ONLY): Likewise.
(aarch64_opcode_subclass_p): New definition.
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When the SCFI machinery detects that a register has been restored from
stack, it makes some state changes in the SCFI state object.
Prior to the patch, scfi_state_restore_reg () was setting a value of
(reg, CFI_IN_REG) for (base, state) respectively. This was causing
issues in the cmp_scfi_state () function:
- The default state of all (callee-saved) regs at the beginning of
function is set to (0, CFI_UNDEFINED).
- If a register is saved and restored on some control path, the state
of reg is (reg, CFI_IN_REG) on that path.
- On another control path where the register was perhaps not
used (or saved/restored on stack) remains (0, CFI_UNDEFINED).
- The two states should be treated equal, however, at the point in
program after the register has been restored.
Fix this by resetting the state to (0, CFI_UNDEFINED) in
scfi_state_restore_reg ().
A testcase (scfi-cfg-4.s) for this is added in a subsequent commit.
gas/
* scfi.c (scfi_state_restore_reg): Reset to 0, CFI_UNDEFINED
for base, state.
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- help message: add a comma between the short and long option
- as doc:
- brief summary of how to invoke gas: separate [-w] [-x] on a new line as those
two options have nothing to do with the warning options.
- reordering of the warning options to have the same order as the listing.
- no-warn option description: change an "and" to a "or", as it is either the short
or long option to use, but not both at the same time.
- remove trailing whitespaces.
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Within the debug-file-directory GDB looks for the existence of a
.build-id directory.
Within the .build-id directory GDB looks for files with the form:
.build-id/ff/4b4142d62b399499844924d53e33d4028380db.debug
which contain the debug information for the objfile with the build-id
ff4b4142d62b399499844924d53e33d4028380db.
There appear to be two strategies for populating the .build-id
directory. Ubuntu takes the approach of placing the actual debug
information in this directory, so
4b4142d62b399499844924d53e33d4028380db.debug is an actual file
containing the debug information.
Fedora, RHEL, and SUSE take a slightly different approach, placing the
debug information elsewhere, and then creating symlinks in the
.build-id directory back to the original debug information file. The
actual debug information is arranged in a mirror of the filesystem
within the debug directory, as an example, if the debug-file-directory
is /usr/lib/debug, then the debug information for /bin/foo can be
found in /usr/lib/debug/bin/foo.debug.
Where this gets interesting is that in some cases a package will
install a single binary with multiple names, in this case a single
binary will be install with either hard-links, or symlinks providing
the alternative names.
The debug information for these multiple binaries will then be placed
into the /usr/lib/debug/ tree, and again, links are created so a
single file can provide debug information for each of the names that
binary presents as. An example file system might look like this (the
[link] could be symlinks, but are more likely hard-links):
/bin/
foo
bar -> foo [ HARD LINK ]
baz -> foo [ HARD LINK ]
/usr/
lib/
debug/
bin/
foo.debug
bar.debug -> foo.debug [ HARD LINK ]
baz.debug -> foo.debug [ HARD LINK ]
In the .build-id tree though we have a problem. Do we have a single
entry that links to one of the .debug files? This would work; a user
debugging any of the binaries will find the debug information based on
the build-id, and will get the correct information, after all the
.debug files are identical (same file linked together). But there is
one problem with this approach.
Sometimes, for *reasons* it's possible that one or more the linked
binaries might get removed, along with its associated debug
information. I'm honestly not 100% certain under what circumstances
this can happen, but what I observe is that sometime a single name for
a binary, and its corresponding .debug entry, can be missing. If this
happens to be the entry that the .build-id link is pointing at, then
we have a problem. The user can no longer find the debug information
based on the .build-id link.
The solution that Fedora, RHEL, & SUSE have adopted is to add multiple
entries in the .build-id tree, with each entry pointing to a different
name within the debug/ tree, a sequence number is added to the
build-id to distinguish the multiple entries. Thus, we might end up
with a layout like this:
/bin/
foo
bar -> foo [ HARD LINK ]
baz -> foo [ HARD LINK ]
/usr/
lib/
debug/
bin/
foo.debug
bar.debug -> foo.debug [ HARD LINK ]
baz.debug -> foo.debug [ HARD LINK ]
.build-id/
a3/
4b4142d62b399499844924d53e33d4028380db.debug -> ../../debug/bin/foo.debug [ SYMLINK ]
4b4142d62b399499844924d53e33d4028380db.1.debug -> ../../debug/bin/bar.debug [ SYMLINK ]
4b4142d62b399499844924d53e33d4028380db.2.debug -> ../../debug/bin/baz.debug [ SYMLINK ]
With current master GDB, debug information will only ever be looked up
via the 4b4142d62b399499844924d53e33d4028380db.debug link. But if
'foo' and its corresponding 'foo.debug' are ever removed, then master
GDB will fail to find the debug information.
Ubuntu seems to have a much better approach for debug information
handling; they place the debug information directly into the .build-id
tree, so there only ever needs to be a single entry for any one
build-id. I wonder if/how they handle the case where multiple names
might share a single .debug file, if one of those names is then
uninstalled, how do they know the .debug file should be retained or
not ... but I assume that problem either doesn't exist or has been
solved.
Anyway, for a while Fedora has carried a patch that handles the
build-id sequence number logic. What's presented here is inspired by
the Fedora patch, but has some changes to fix some issues.
I'm aware that this is a patch that applies to only some (probably a
minority) of distros. However, the logic is contained to only a
single function in build-id.c, and isn't too complex, so I'm hoping
that there wont be too many objections.
For distros that don't have build-id sequence numbers there should be
no impact. The sequence number approach still leaves the first file
without a sequence number, and this is the first file that GDB (after
this patch) checks for. The new logic only kicks in if the
non-sequence numbered first file exists, but is a symlink to a non
existent file; in this case GDB checks for the sequence numbered files
instead.
Tests are included.
There is a small fix needed for gdb.base/sysroot-debug-lookup.exp,
after this commit GDB now treats a target: sysroot where the target
file system is local to GDB the same as if the sysroot had no target:
prefix. The consequence of this is that GDB now resolves a symlink
back to the real filename in the sysroot-debug-lookup.exp test where
it didn't previously. As this behaviour is inline with the case where
there is no target: prefix I think this is fine.
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After the previous two commits, this commit adds support for the
vFile::stat packet to gdbserver. This is pretty similar to the
handling for vFile::fstat, but instead calls 'lstat'.
There's still no users of target_fileio_stat in GDB, that will come in
a later commit.
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This commit adds the GDB side of target_ops::fileio_stat. There's an
implementation for inf_child_target, which just calls 'lstat', and
there's an implementation for remote_target, which sends a new
vFile:stat packet.
The new packet is documented.
There's still no users of target_fileio_stat as I have not yet added
support for vFile::stat to gdbserver. If these packets are currently
sent to gdbserver then they will be reported as not supported and the
ENOSYS error code will be returned.
Reviewed-By: Eli Zaretskii <eliz@gnu.org>
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In a later commit I want target_fileio_stat, that is a call that
operates on a filename rather than an open file descriptor as
target_fileio_fstat does.
This commit adds the initial framework for target_fileio_stat, I've
added the top level target function and the virtual target_ops methods
in the target_ops base class.
At this point no actual targets override target_ops::fileio_stat, so
any attempts to call this function will return ENOSYS error code.
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gas/ChangeLog:
* NEWS: Added "APX_F is fully supportted" to gas/NEWS.
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When running test-case gdb.arch/arm-pseudo-unwind.exp with target board
unix/mthumb, we run into:
...
(gdb) continue^M
Continuing.^M
^M
Program received signal SIGILL, Illegal instruction.^M
0x00400f38 in ?? ()^M
(gdb) FAIL: $exp: continue to breakpoint: continue to callee
...
The test-case attempts to force arm-pseudo-unwind.c to be compiled in arm mode
using additional_flags=-marm, but that's overridden by using target board
unix/mthumb.
This causes function main to be in thumb mode, and consequently function
caller (which is called from main) is is executed as if it's in thumb mode,
while it's actually in arm mode.
Fix this by adding an intermediate function caller_trampoline in
arm-pseudo-unwind.c, and hardcoding it to arm mode using
__attribute__((target("arm"))).
Likewise for test-case gdb.arch/arm-pseudo-unwind-legacy.exp.
Tested on arm-linux.
Approved-By: Luis Machado <luis.machado@arm.com>
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Update some stale text in the README. Add few more notes to guide
future maintenance of the testsuite.
gas/testsuite/
* gas/scfi/README: Update text.
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C++ 11 has a built-in attribute for this, no need to use a compat macro.
Change-Id: I90e4220d26e8f3949d91761f8a13cd9c37da3875
Reviewed-by: Lancelot Six <lancelot.six@amd.com>
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Change-Id: If344acdf703fdd3892f73f75fc891d5473808b79
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My IDE (well, clangd) suggested this. It doesn't hurt to have it.
Change-Id: If6001983c17dbed3dceebac3078c8deb12c04d6b
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I noticed a lot of escaping in test-case gdb.base/complex-parts.exp.
Make the test-case more readable by using:
- string_to_regexp, and
- {} instead of "".
Tested on x86_64-linux and aarch64-linux.
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Make the current program space bubble up one level.
Change-Id: I5ac1e3290ad266730465cd60aa3672d45ffa6475
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Make the current program space reference bubble up one level.
Change-Id: Iee8b11c853c76e539c991c4785737c69e6a1925c
Approved-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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Make the current program space reference bubble up one level.
Change-Id: I81e45e89e0cfd87c308f801d49ae811a941348b7
Approved-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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Make the current program space reference bubble up one level.
Change-Id: Ifc9b8186abaefb10caf99f79ae09e526fa65c882
Approved-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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Make the current program space bubble up one level.
Change-Id: Ic3ad0869ca1afe41854f605a6f7eb092fca29ff8
Approved-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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Make the current program space reference bubble up one level.
Change-Id: I9b33c9e0d22c171eb1bb59ce480621b02c7b7bf7
Approved-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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Make the current program space reference bubble up one level.
Change-Id: I6ba6dc4a2cb188720cbb61b84ab5c954aac105c6
Approved-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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Make the current program space reference bubble up one level.
Change-Id: I19c4fc2ca955f9c828ef426a077b43983865697b
Approved-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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Change return types to bool, and make a few stylistic adjustments.
Change-Id: I784c3c33af0394a77c25064b06eb3e128e69222f
Approved-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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Make the current program space reference bubble up one level.
Change-Id: I692554474d17e4f4708fd8ad662bf6c0bb964726
Approved-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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Use `this` instead of `current_program_space`. Presumably, the method
wants to check the solibs of "this" program space, not the current
global program space (although they are likely always the same at the
moment).
Change-Id: Iaf0534f36bfd47c04c53ed0657da332bdb8fb906
Approved-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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Make the current program space reference bubble up one level. Pass
`current_program_space` everywhere, except in some cases where we can
get the pspace another way, and it's relatively obvious that it's the
same as the current program space.
Change-Id: Id86b79f1e44f92a398f49d137d57457174dfa96d
Approved-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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The `no_shared_libraries` function is currently used to implement the
`nosharedlibrary` command, but it also used internally by other
functions. This does not make a very good internal API.
Add the `no_shared_libraries_command` function to implement the CLI
command. Remove the unused parameters from `no_shared_libraries`.
Remove the `from_tty` parameter of `target_pre_inferior`, since it's now
unused.
Change-Id: I4fcba5ee1e0f7d250aab1a7b62b9ea16265fe962
Approved-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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Make the current program space reference bubble up one level.
Change-Id: I08cfa77a0351c9602131ed2a294eabb1f1f59a6e
Approved-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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I think it would make sense to use objfile::pspace instead of the
current program space here. It reduces the risks of calling this
method with the wrong current program space set.
Change-Id: Id4f3644719f232640c83a1c7f4aa92eaa6af6c5c
Approved-By: Tom Tromey <tom@tromey.com>
Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
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It is obvious that pspace is the same as current_program_space in these
cases, due to the set_current_program_space call just above. The rest
of the functions probably care about the current program space though,
so leave the set_cset_current_program_space calls there.
Change-Id: I3c300decbf2c2fe5f25aa7f697ebcb524432394f
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Currently you get this assertion failure if you try to execute the
inferior after loading a saved recording, when no recording was done
earlier in the same gdb session:
```
$ gdb -q c -ex "record restore test.rec"
Reading symbols from c...
[New LWP 26428]
Core was generated by `/tmp/c'.
Restored records from core file /tmp/test.rec.
(gdb) c
Continuing.
../../gdb/inferior.c:293: internal-error: inferior* find_inferior_pid(process_stratum_target*, int): Assertion `pid != 0' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
```
The change in step-precsave.exp triggers this bug, since now the
recording is loaded in a new gdb session, where
record_full_resume_ptid was never set.
The fix is to simply set record_full_resume_ptid when resuming a loaded
recording.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31971
Approved-By: Guinevere Larsen <blarsen@redhat.com>
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Rename to m_pspace, add getter. An objfile's pspace never changes, so
no setter is necessary.
Change-Id: If4dfb300cb90dc0fb9776ea704ff92baebb8f626
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The option only makes sense for RELA relative relocs where the
addend is present, not for RELR relative relocs.
Fixes bug 31924.
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Commit d125f9675372b1ae01ceb1893c06ccb27bc7bf22 introduced a bug
in handling relocations for data. The R_PARISC_DIR32 relocation
operates on 32-bit data and not instructions. The HOWTO table
needs to be used to determine the format of relocations that apply
to data. The R_PARISC_SEGBASE relocation is another special case
as it only changes segment base.
This was noticed in Debian cmor package build.
2024-07-14 John David Anglin <danglin@gcc.gnu.org>
bfd/ChangeLog:
* elf32-hppa.c (final_link_relocate): Use HOWTO table to
determine reload format for relocations that apply to data.
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This reverts commit d49f2dd78b08efa4e1ee51f5df5058846c2eb4fa. It was
applied unapproved.
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This reverts commit bfa257b407270d1c808b31fbd97da779e0fd20d2. It was
applied unapproved.
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In the past, the .align directive generated a label that did not match
the regular expression, and we set it to XFAIL.
But now it matches fine so it becomes XPASS. We fix it with PASS.
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This imports the following commits from GCC as of r15-1722-g7682d115402743:
ca2f7c84927f libiberty: Invoke D demangler when --format=auto
94792057ad4a Fix up duplicated words mostly in comments, part 1
20e57660e64e libiberty: Fix error return value in pex_unix_exec_child [PR113957].
52ac4c6be866 [libiberty] remove TBAA violation in iterative_hash, improve code-gen
53bb7145135c libiberty: Fix up libiberty_vprintf_buffer_size
65388b28656d c++, demangle: Implement https://github.com/itanium-cxx-abi/cxx-abi/issues/148 non-proposal
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This complements and reuses logic from Andreas Krebbel's commit
896a639babe2 ("s390: Avoid reloc overflows on undefined weak symbols").
Replace relative long addressing instructions of weak symbols, which
will definitely resolve to zero, with either a load address of 0 or a
a trapping insn.
This prevents the PLT32DBL relocation from overflowing in case the
binary will be loaded at 4GB or more.
bfd/
* elf64-s390.c (elf_s390_relocate_section): Replace
instructions using undefined weak symbols with relative
addressing to avoid relocation overflows.
ld/
* testsuite/ld-s390/s390.exp: Add new test.
* testsuite/ld-s390/weakundef-2.s: New test.
* testsuite/ld-s390/weakundef-2.dd: Likewise.
Reported-by: Alexander Gordeev <agordeev@linux.ibm.com>
Suggested-by: Ilya Leoshkevich <iii@linux.ibm.com>
Suggested-by: Andreas Krebbel <krebbel@linux.ibm.com>
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
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Branch Relative on Count High (brcth) is a conditional branch relative
instruction. It is not guaranteed that it only appears within loops
that sooner or later will take the branch. It may very well be used to
check a condition that will prevent the branch from ever being taken.
bfd/
* elf64-s390.c (elf_s390_relocate_section): Do not replace brcth
referencing undefined weak symbol with a trap.
ld/
* testsuite/ld-s390/weakundef-1.s: Update test case accordingly.
* testsuite/ld-s390/weakundef-1.dd: Likewise.
Fixes: 896a639babe2 ("s390: Avoid reloc overflows on undefined weak symbols")
Signed-off-by: Jens Remus <jremus@linux.ibm.com>
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This patch adds support for following sme2.1 zero instructions and
the spec is available here [1].
1. ZERO (single-vector).
2. ZERO (double-vector).
3. ZERO (quad-vector).
The VECTOR GROUP symbols VGx2 and VGx4 are optional for the assembler
for most of the sme and sve instructions. But for few of the sme2.1
zero instruction variants VECTOR GROUP symbols VGx2 and VGx4 are mandatory.
To address this a bit "F_VG_REQ" is introduced in this patch, on setting
F_VG_REQ bit in flags of aarch64_opcode forces the assembler to accept
instruction operand only having VECTOR GROUP symbols.
[1]: https://developer.arm.com/documentation/ddi0602/2024-03/SME-Instructions?lang=en
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