[PATCH, BINUTILS, AARCH64, 7/9] Add BTI instruction

[Sudakshina Das]

Hi

This patch is part of the patch series to add support for ARMv8.5-A
extensions.
(https://developer.arm.com/products/architecture/cpu-architecture/a-profile/docs/ddi0596/a/a64-base-instructions-alphabetic-order/bti-branch-target-identification)

The Branch Target Identification instructions (BTI) are allocated to
existing HINT space, using HINT numbers 32, 34, 36, 38, such that
bits[7:6] of the instruction identify the compatibility of the BTI
instruction to different branches.
BTI {<targets>}
where <targets> one of the following, specifying which type of
indirection is allowed:
j : Can be a target of any BR Xn isntruction.
c : Can be a target of any BLR Xn and BR {X16|X17}.
jc: Can be a target of any free branch.

A BTI instruction without any <targets> is the strictest of all and
can not be a target of nay free branch.

Testing done: Builds and reg tests all pass on aarch64-none-linux-gnu.
and aarch64-none-elf. Updated and added new tests to check.

Ok for trunk?

Thanks
Sudi
PS. I do not have commit access so if OK can someone apply for me?
Also the patch was too big to attach due to the regenerated files.


*** include/ChangeLog ***

2018-xx-xx Sudakshina Das <***@arm.com>

* opcode/aarch64.h (AARCH64_FEATURE_BTI): New.
(AARCH64_ARCH_V8_5): Add AARCH64_FEATURE_BTI by default.
(aarch64_opnd): Add AARCH64_OPND_BTI_TARGET.

*** opcodes/ChangeLog ***

2018-xx-xx Sudakshina Das <***@arm.com>

* aarch64-opc.c (aarch64_hint_options): New entries for
c, j, jc and default for BTI.
(aarch64_print_operand): Add case for AARCH64_OPND_BTI_TARGET
and create an exception for "default" option.
* aarch64-tbl.h (aarch64_feature_bti, BTI, BTI_INSN): New.
(aarch64_opcode_table): Add entry for BTI.
(AARCH64_OPERANDS): Add new description for BTI targets.
* aarch64-asm-2.c: Regenerate.
* aarch64-dis-2.c: Regenerate.
* aarch64-opc-2.c: Regenerate.

*** gas/ChangeLog ***

2018-xx-xx Sudakshina Das <***@arm.com>

* config/tc-aarch64.c (parse_bti_operand): New.
(process_omitted_operand): Add case for AARCH64_OPND_BTI_TARGET.
(parse_operands): Likewise.
* testsuite/gas/aarch64/system.d: Update for BTI.
* testsuite/gas/aarch64/bti.s: New.
* testsuite/gas/aarch64/bti.d: New.
* testsuite/gas/aarch64/illegal-bti.d: New.
* testsuite/gas/aarch64/illegal-bti.l: New.

[Richard Earnshaw (lists)]

Post by Sudakshina Das
Hi
This patch is part of the patch series to add support for ARMv8.5-A
extensions.
(https://developer.arm.com/products/architecture/cpu-architecture/a-profile/docs/ddi0596/a/a64-base-instructions-alphabetic-order/bti-branch-target-identification)
The Branch Target Identification instructions (BTI) are allocated to
existing HINT space, using HINT numbers 32, 34, 36, 38, such that
bits[7:6] of the instruction identify the compatibility of the BTI
instruction to different branches.
BTI {<targets>}
where <targets> one of the following, specifying which type of
j : Can be a target of any BR Xn isntruction.
c : Can be a target of any BLR Xn and BR {X16|X17}.
jc: Can be a target of any free branch.
A BTI instruction without any <targets> is the strictest of all and
can not be a target of nay free branch.
Testing done: Builds and reg tests all pass on aarch64-none-linux-gnu.
and aarch64-none-elf. Updated and added new tests to check.
Ok for trunk?
Thanks
Sudi
PS. I do not have commit access so if OK can someone apply for me?
Also the patch was too big to attach due to the regenerated files.
*** include/ChangeLog ***
* opcode/aarch64.h (AARCH64_FEATURE_BTI): New.
(AARCH64_ARCH_V8_5): Add AARCH64_FEATURE_BTI by default.
(aarch64_opnd): Add AARCH64_OPND_BTI_TARGET.
*** opcodes/ChangeLog ***
* aarch64-opc.c (aarch64_hint_options): New entries for
c, j, jc and default for BTI.
(aarch64_print_operand): Add case for AARCH64_OPND_BTI_TARGET
and create an exception for "default" option.
* aarch64-tbl.h (aarch64_feature_bti, BTI, BTI_INSN): New.
(aarch64_opcode_table): Add entry for BTI.
(AARCH64_OPERANDS): Add new description for BTI targets.
* aarch64-asm-2.c: Regenerate.
* aarch64-dis-2.c: Regenerate.
* aarch64-opc-2.c: Regenerate.
*** gas/ChangeLog ***
* config/tc-aarch64.c (parse_bti_operand): New.
(process_omitted_operand): Add case for AARCH64_OPND_BTI_TARGET.
(parse_operands): Likewise.
* testsuite/gas/aarch64/system.d: Update for BTI.
* testsuite/gas/aarch64/bti.s: New.
* testsuite/gas/aarch64/bti.d: New.
* testsuite/gas/aarch64/illegal-bti.d: New.
* testsuite/gas/aarch64/illegal-bti.l: New.

gas/config/tc-aarch64.c:

+ case 0x22:
+ case 0x24:
+ case 0x26: break;
+ default:

Put the 'break on a separate line when you have multiple cases. Blank
line before the default.

Also, if the user writes

bti default
bti fred

they will get a different error message for each line. That's inconsistent.

opcodes/aarch64-opc.c:

case AARCH64_OPND_BARRIER_PSB:
- snprintf (buf, size, "%s", opnd->hint_option->name);
+ case AARCH64_OPND_BTI_TARGET:
+ /* BTI with no target. */
+ if (opnd->hint_option->value != 0x20)
+ snprintf (buf, size, "%s", opnd->hint_option->name);
break;

I don't particularly like the specific exception here. Can we find a
better way to do this? Perhaps a flag bit associated with the tupple to
indicate that the name field should not be printed.

[Sudakshina Das]

Hi Richard

Post by Richard Earnshaw (lists)

Post by Sudakshina Das
Hi
This patch is part of the patch series to add support for ARMv8.5-A
extensions.
(https://developer.arm.com/products/architecture/cpu-architecture/a-profile/docs/ddi0596/a/a64-base-instructions-alphabetic-order/bti-branch-target-identification)
The Branch Target Identification instructions (BTI) are allocated to
existing HINT space, using HINT numbers 32, 34, 36, 38, such that
bits[7:6] of the instruction identify the compatibility of the BTI
instruction to different branches.
BTI {<targets>}
where <targets> one of the following, specifying which type of
j : Can be a target of any BR Xn isntruction.
c : Can be a target of any BLR Xn and BR {X16|X17}.
jc: Can be a target of any free branch.
A BTI instruction without any <targets> is the strictest of all and
can not be a target of nay free branch.
Testing done: Builds and reg tests all pass on aarch64-none-linux-gnu.
and aarch64-none-elf. Updated and added new tests to check.
Ok for trunk?
Thanks
Sudi
PS. I do not have commit access so if OK can someone apply for me?
Also the patch was too big to attach due to the regenerated files.
*** include/ChangeLog ***
* opcode/aarch64.h (AARCH64_FEATURE_BTI): New.
(AARCH64_ARCH_V8_5): Add AARCH64_FEATURE_BTI by default.
(aarch64_opnd): Add AARCH64_OPND_BTI_TARGET.
*** opcodes/ChangeLog ***
* aarch64-opc.c (aarch64_hint_options): New entries for
c, j, jc and default for BTI.
(aarch64_print_operand): Add case for AARCH64_OPND_BTI_TARGET
and create an exception for "default" option.
* aarch64-tbl.h (aarch64_feature_bti, BTI, BTI_INSN): New.
(aarch64_opcode_table): Add entry for BTI.
(AARCH64_OPERANDS): Add new description for BTI targets.
* aarch64-asm-2.c: Regenerate.
* aarch64-dis-2.c: Regenerate.
* aarch64-opc-2.c: Regenerate.
*** gas/ChangeLog ***
* config/tc-aarch64.c (parse_bti_operand): New.
(process_omitted_operand): Add case for AARCH64_OPND_BTI_TARGET.
(parse_operands): Likewise.
* testsuite/gas/aarch64/system.d: Update for BTI.
* testsuite/gas/aarch64/bti.s: New.
* testsuite/gas/aarch64/bti.d: New.
* testsuite/gas/aarch64/illegal-bti.d: New.
* testsuite/gas/aarch64/illegal-bti.l: New.

+ case 0x26: break;
Put the 'break on a separate line when you have multiple cases. Blank
line before the default.
Also, if the user writes
bti default
bti fred
they will get a different error message for each line. That's inconsistent.
- snprintf (buf, size, "%s", opnd->hint_option->name);
+ /* BTI with no target. */
+ if (opnd->hint_option->value != 0x20)
+ snprintf (buf, size, "%s", opnd->hint_option->name);
break;
I don't particularly like the specific exception here. Can we find a
better way to do this? Perhaps a flag bit associated with the tupple to
indicate that the name field should not be printed.

Please find a new version attached. Since the #imm for HINT is only a
7-bit value. I have edited the use of the "value" in the
aarch64_name_value_pair to encode both #imm and a Flag indicating
that the name does not need printing.

*** include/ChangeLog ***

2018-xx-xx Sudakshina Das <***@arm.com>

* opcode/aarch64.h (AARCH64_FEATURE_BTI): New.
(AARCH64_ARCH_V8_5): Add AARCH64_FEATURE_BTI by default.
(aarch64_opnd): Add AARCH64_OPND_BTI_TARGET.

*** opcodes/ChangeLog ***

2018-xx-xx Sudakshina Das <***@arm.com>

* aarch64-opc.h (HINT_OPD_NOPRINT, HINT_ENCODE): New.
(HINT_FLAG, HINT_VALUE): New macros to encode NO_PRINT flag
with the hint immediate.
* aarch64-opc.c (aarch64_hint_options): New entries for
c, j, jc and default (with HINT_NOPRINT flag) for BTI.
(aarch64_print_operand): Add case for AARCH64_OPND_BTI_TARGET
while checking for HINT_OPD_NOPRINT flag.
* aarch64-dis.c (aarch64_ext_hint): Use new HINT_VALUE to
extract value.
* aarch64-tbl.h (aarch64_feature_bti, BTI, BTI_INSN): New.
(aarch64_opcode_table): Add entry for BTI.
(AARCH64_OPERANDS): Add new description for BTI targets.
* aarch64-asm-2.c: Regenerate.
* aarch64-dis-2.c: Regenerate.
* aarch64-opc-2.c: Regenerate.

*** gas/ChangeLog ***

2018-xx-xx Sudakshina Das <***@arm.com>

* config/tc-aarch64.c (parse_bti_operand): New.
(process_omitted_operand): Add case for AARCH64_OPND_BTI_TARGET.
(parse_operands): Likewise.
* testsuite/gas/aarch64/system.d: Update for BTI.
* testsuite/gas/aarch64/bti.s: New.
* testsuite/gas/aarch64/bti.d: New.
* testsuite/gas/aarch64/illegal-bti.d: New.
* testsuite/gas/aarch64/illegal-bti.l: New.


Thanks
Sudi

[Sudakshina Das]

Hi Richard

Post by Sudakshina Das
Hi Richard

Post by Sudakshina Das
Hi
This patch is part of the patch series to add support for ARMv8.5-A
extensions.
(https://developer.arm.com/products/architecture/cpu-architecture/a-profile/docs/ddi0596/a/a64-base-instructions-alphabetic-order/bti-branch-target-identification)
The Branch Target Identification instructions (BTI) are allocated to
existing HINT space, using HINT numbers 32, 34, 36, 38, such that
bits[7:6] of the instruction identify the compatibility of the BTI
instruction to different branches.
         BTI {<targets>}
where <targets> one of the following, specifying which type of
        j : Can be a target of any BR Xn isntruction.
        c : Can be a target of any BLR Xn and BR {X16|X17}.
        jc: Can be a target of any free branch.
A BTI instruction without any <targets> is the strictest of all and
can not be a target of nay free branch.
Testing done: Builds and reg tests all pass on aarch64-none-linux-gnu.
and aarch64-none-elf. Updated and added new tests to check.
Ok for trunk?
Thanks
Sudi
PS. I do not have commit access so if OK can someone apply for me?
Also the patch was too big to attach due to the regenerated files.
*** include/ChangeLog ***
    * opcode/aarch64.h (AARCH64_FEATURE_BTI): New.
    (AARCH64_ARCH_V8_5): Add AARCH64_FEATURE_BTI by default.
    (aarch64_opnd): Add AARCH64_OPND_BTI_TARGET.
*** opcodes/ChangeLog ***
    * aarch64-opc.c (aarch64_hint_options): New entries for
    c, j, jc and default for BTI.
    (aarch64_print_operand): Add case for AARCH64_OPND_BTI_TARGET
    and create an exception for "default" option.
    * aarch64-tbl.h (aarch64_feature_bti, BTI, BTI_INSN): New.
    (aarch64_opcode_table): Add entry for BTI.
    (AARCH64_OPERANDS): Add new description for BTI targets.
    * aarch64-asm-2.c: Regenerate.
    * aarch64-dis-2.c: Regenerate.
    * aarch64-opc-2.c: Regenerate.
*** gas/ChangeLog ***
    * config/tc-aarch64.c (parse_bti_operand): New.
    (process_omitted_operand): Add case for AARCH64_OPND_BTI_TARGET.
    (parse_operands): Likewise.
    * testsuite/gas/aarch64/system.d: Update for BTI.
    * testsuite/gas/aarch64/bti.s: New.
    * testsuite/gas/aarch64/bti.d: New.
    * testsuite/gas/aarch64/illegal-bti.d: New.
    * testsuite/gas/aarch64/illegal-bti.l: New.

+    case 0x26: break;
Put the 'break on a separate line when you have multiple cases.  Blank
line before the default.
Also, if the user writes
    bti default
    bti fred
they will get a different error message for each line.  That's
inconsistent.
-      snprintf (buf, size, "%s", opnd->hint_option->name);
+      /* BTI with no target.  */
+      if (opnd->hint_option->value != 0x20)
+    snprintf (buf, size, "%s", opnd->hint_option->name);
        break;
I don't particularly like the specific exception here.  Can we find a
better way to do this?  Perhaps a flag bit associated with the tupple to
indicate that the name field should not be printed.

Please find a new version attached. Since the #imm for HINT is only a
7-bit value. I have edited the use of the "value" in the
aarch64_name_value_pair to encode both #imm and a Flag indicating
that the name does not need printing.

With new macros for the bti operands:

*** include/ChangeLog ***

2018-xx-xx Sudakshina Das <***@arm.com>

* opcode/aarch64.h (AARCH64_FEATURE_BTI): New.
(AARCH64_ARCH_V8_5): Add AARCH64_FEATURE_BTI by default.
(aarch64_opnd): Add AARCH64_OPND_BTI_TARGET.
(HINT_OPD_CSYNC, HINT_OPD_C, HINT_OPD_J): New macros to
define HINT #imm values.
(HINT_OPD_JC, HINT_OPD_NULL): Likewise.

*** opcodes/ChangeLog ***

2018-xx-xx Sudakshina Das <***@arm.com>

* aarch64-opc.h (HINT_OPD_NOPRINT, HINT_ENCODE): New.
(HINT_FLAG, HINT_VALUE): New macros to encode NO_PRINT flag
with the hint immediate.
* aarch64-opc.c (aarch64_hint_options): New entries for
c, j, jc and default (with HINT_OPD_F_NOPRINT flag) for BTI.
(aarch64_print_operand): Add case for AARCH64_OPND_BTI_TARGET
while checking for HINT_OPD_F_NOPRINT flag.
* aarch64-dis.c (aarch64_ext_hint): Use new HINT_VALUE to
extract value.
* aarch64-tbl.h (aarch64_feature_bti, BTI, BTI_INSN): New.
(aarch64_opcode_table): Add entry for BTI.
(AARCH64_OPERANDS): Add new description for BTI targets.
* aarch64-asm-2.c: Regenerate.
* aarch64-dis-2.c: Regenerate.
* aarch64-opc-2.c: Regenerate.

*** gas/ChangeLog ***

2018-xx-xx Sudakshina Das <***@arm.com>

* config/tc-aarch64.c (parse_bti_operand): New.
(process_omitted_operand): Add case for AARCH64_OPND_BTI_TARGET.
(parse_operands): Likewise.
* testsuite/gas/aarch64/system.d: Update for BTI.
* testsuite/gas/aarch64/bti.s: New.
* testsuite/gas/aarch64/bti.d: New.
* testsuite/gas/aarch64/illegal-bti.d: New.
* testsuite/gas/aarch64/illegal-bti.l: New.

Thanks
Sudi

Post by Sudakshina Das
*** include/ChangeLog ***
    * opcode/aarch64.h (AARCH64_FEATURE_BTI): New.
    (AARCH64_ARCH_V8_5): Add AARCH64_FEATURE_BTI by default.
    (aarch64_opnd): Add AARCH64_OPND_BTI_TARGET.
*** opcodes/ChangeLog ***
    * aarch64-opc.h (HINT_OPD_NOPRINT, HINT_ENCODE): New.
     (HINT_FLAG, HINT_VALUE): New macros to encode NO_PRINT flag
    with the hint immediate.
    * aarch64-opc.c (aarch64_hint_options): New entries for
    c, j, jc and default (with HINT_NOPRINT flag) for BTI.
    (aarch64_print_operand): Add case for AARCH64_OPND_BTI_TARGET
    while checking for HINT_OPD_NOPRINT flag.
    * aarch64-dis.c (aarch64_ext_hint): Use new HINT_VALUE to
    extract value.
    * aarch64-tbl.h (aarch64_feature_bti, BTI, BTI_INSN): New.
    (aarch64_opcode_table): Add entry for BTI.
    (AARCH64_OPERANDS): Add new description for BTI targets.
    * aarch64-asm-2.c: Regenerate.
    * aarch64-dis-2.c: Regenerate.
    * aarch64-opc-2.c: Regenerate.
*** gas/ChangeLog ***
    * config/tc-aarch64.c (parse_bti_operand): New.
    (process_omitted_operand): Add case for AARCH64_OPND_BTI_TARGET.
    (parse_operands): Likewise.
    * testsuite/gas/aarch64/system.d: Update for BTI.
    * testsuite/gas/aarch64/bti.s: New.
    * testsuite/gas/aarch64/bti.d: New.
    * testsuite/gas/aarch64/illegal-bti.d: New.
    * testsuite/gas/aarch64/illegal-bti.l: New.
Thanks
Sudi

[Richard Earnshaw (lists)]

Post by Sudakshina Das
Hi Richard

Post by Sudakshina Das
Hi Richard

Post by Sudakshina Das
Hi
This patch is part of the patch series to add support for ARMv8.5-A
extensions.
(https://developer.arm.com/products/architecture/cpu-architecture/a-profile/docs/ddi0596/a/a64-base-instructions-alphabetic-order/bti-branch-target-identification)
The Branch Target Identification instructions (BTI) are allocated to
existing HINT space, using HINT numbers 32, 34, 36, 38, such that
bits[7:6] of the instruction identify the compatibility of the BTI
instruction to different branches.
         BTI {<targets>}
where <targets> one of the following, specifying which type of
        j : Can be a target of any BR Xn isntruction.
        c : Can be a target of any BLR Xn and BR {X16|X17}.
        jc: Can be a target of any free branch.
A BTI instruction without any <targets> is the strictest of all and
can not be a target of nay free branch.
Testing done: Builds and reg tests all pass on aarch64-none-linux-gnu.
and aarch64-none-elf. Updated and added new tests to check.
Ok for trunk?
Thanks
Sudi
PS. I do not have commit access so if OK can someone apply for me?
Also the patch was too big to attach due to the regenerated files.
*** include/ChangeLog ***
    * opcode/aarch64.h (AARCH64_FEATURE_BTI): New.
    (AARCH64_ARCH_V8_5): Add AARCH64_FEATURE_BTI by default.
    (aarch64_opnd): Add AARCH64_OPND_BTI_TARGET.
*** opcodes/ChangeLog ***
    * aarch64-opc.c (aarch64_hint_options): New entries for
    c, j, jc and default for BTI.
    (aarch64_print_operand): Add case for AARCH64_OPND_BTI_TARGET
    and create an exception for "default" option.
    * aarch64-tbl.h (aarch64_feature_bti, BTI, BTI_INSN): New.
    (aarch64_opcode_table): Add entry for BTI.
    (AARCH64_OPERANDS): Add new description for BTI targets.
    * aarch64-asm-2.c: Regenerate.
    * aarch64-dis-2.c: Regenerate.
    * aarch64-opc-2.c: Regenerate.
*** gas/ChangeLog ***
    * config/tc-aarch64.c (parse_bti_operand): New.
    (process_omitted_operand): Add case for AARCH64_OPND_BTI_TARGET.
    (parse_operands): Likewise.
    * testsuite/gas/aarch64/system.d: Update for BTI.
    * testsuite/gas/aarch64/bti.s: New.
    * testsuite/gas/aarch64/bti.d: New.
    * testsuite/gas/aarch64/illegal-bti.d: New.
    * testsuite/gas/aarch64/illegal-bti.l: New.

+    case 0x26: break;
Put the 'break on a separate line when you have multiple cases.  Blank
line before the default.
Also, if the user writes
    bti default
    bti fred
they will get a different error message for each line.  That's
inconsistent.
-      snprintf (buf, size, "%s", opnd->hint_option->name);
+      /* BTI with no target.  */
+      if (opnd->hint_option->value != 0x20)
+    snprintf (buf, size, "%s", opnd->hint_option->name);
        break;
I don't particularly like the specific exception here.  Can we find a
better way to do this?  Perhaps a flag bit associated with the tupple to
indicate that the name field should not be printed.

Please find a new version attached. Since the #imm for HINT is only a
7-bit value. I have edited the use of the "value" in the
aarch64_name_value_pair to encode both #imm and a Flag indicating
that the name does not need printing.

*** include/ChangeLog ***
    * opcode/aarch64.h (AARCH64_FEATURE_BTI): New.
    (AARCH64_ARCH_V8_5): Add AARCH64_FEATURE_BTI by default.
    (aarch64_opnd): Add AARCH64_OPND_BTI_TARGET.
    (HINT_OPD_CSYNC, HINT_OPD_C, HINT_OPD_J): New macros to
    define HINT #imm values.
    (HINT_OPD_JC, HINT_OPD_NULL): Likewise.
*** opcodes/ChangeLog ***
    * aarch64-opc.h (HINT_OPD_NOPRINT, HINT_ENCODE): New.
     (HINT_FLAG, HINT_VALUE): New macros to encode NO_PRINT flag
    with the hint immediate.
    * aarch64-opc.c (aarch64_hint_options): New entries for
    c, j, jc and default (with HINT_OPD_F_NOPRINT flag) for BTI.
    (aarch64_print_operand): Add case for AARCH64_OPND_BTI_TARGET
    while checking for HINT_OPD_F_NOPRINT flag.
    * aarch64-dis.c (aarch64_ext_hint): Use new HINT_VALUE to
    extract value.
    * aarch64-tbl.h (aarch64_feature_bti, BTI, BTI_INSN): New.
    (aarch64_opcode_table): Add entry for BTI.
    (AARCH64_OPERANDS): Add new description for BTI targets.
    * aarch64-asm-2.c: Regenerate.
    * aarch64-dis-2.c: Regenerate.
    * aarch64-opc-2.c: Regenerate.
*** gas/ChangeLog ***
    * config/tc-aarch64.c (parse_bti_operand): New.
    (process_omitted_operand): Add case for AARCH64_OPND_BTI_TARGET.
    (parse_operands): Likewise.
    * testsuite/gas/aarch64/system.d: Update for BTI.
    * testsuite/gas/aarch64/bti.s: New.
    * testsuite/gas/aarch64/bti.d: New.
    * testsuite/gas/aarch64/illegal-bti.d: New.
    * testsuite/gas/aarch64/illegal-bti.l: New.

Committed.

R.

Post by Sudakshina Das
Thanks
Sudi

Post by Sudakshina Das
*** include/ChangeLog ***
     * opcode/aarch64.h (AARCH64_FEATURE_BTI): New.
     (AARCH64_ARCH_V8_5): Add AARCH64_FEATURE_BTI by default.
     (aarch64_opnd): Add AARCH64_OPND_BTI_TARGET.
*** opcodes/ChangeLog ***
     * aarch64-opc.h (HINT_OPD_NOPRINT, HINT_ENCODE): New.
      (HINT_FLAG, HINT_VALUE): New macros to encode NO_PRINT flag
     with the hint immediate.
     * aarch64-opc.c (aarch64_hint_options): New entries for
     c, j, jc and default (with HINT_NOPRINT flag) for BTI.
     (aarch64_print_operand): Add case for AARCH64_OPND_BTI_TARGET
     while checking for HINT_OPD_NOPRINT flag.
     * aarch64-dis.c (aarch64_ext_hint): Use new HINT_VALUE to
     extract value.
     * aarch64-tbl.h (aarch64_feature_bti, BTI, BTI_INSN): New.
     (aarch64_opcode_table): Add entry for BTI.
     (AARCH64_OPERANDS): Add new description for BTI targets.
     * aarch64-asm-2.c: Regenerate.
     * aarch64-dis-2.c: Regenerate.
     * aarch64-opc-2.c: Regenerate.
*** gas/ChangeLog ***
     * config/tc-aarch64.c (parse_bti_operand): New.
     (process_omitted_operand): Add case for AARCH64_OPND_BTI_TARGET.
     (parse_operands): Likewise.
     * testsuite/gas/aarch64/system.d: Update for BTI.
     * testsuite/gas/aarch64/bti.s: New.
     * testsuite/gas/aarch64/bti.d: New.
     * testsuite/gas/aarch64/illegal-bti.d: New.
     * testsuite/gas/aarch64/illegal-bti.l: New.
Thanks
Sudi