[PATCH 2/3] aarch64: Add arch support for LSE128 extension

[Victor Do Nascimento <victor.donascimento@arm.com>]

Enable the `+lse128' feature modifier which, together with new
internal feature flags, enables LSE128 instructions, which are
represented via the new `_LSE128_INSN' macro.

gas/ChangeLog:

	* config/tc-aarch64.c (aarch64_features): Add new "lse128"
	entry.

include/ChangeLog:

	* include/opcode/aarch64.h (enum aarch64_feature_bit): New
	AARCH64_FEATURE_LSE128 feature bit.
	(enum aarch64_insn_class): New lse128_atomic instruction class.

opcodes/ChangeLog:

	* opcodes/aarch64-tbl.h (aarch64_feature_lse128): New.
	(LSE128): Likewise.
	(_LSE128_INSN): Likewise.
---
 gas/config/tc-aarch64.c  | 1 +
 gas/doc/c-aarch64.texi   | 2 ++
 include/opcode/aarch64.h | 3 +++
 opcodes/aarch64-tbl.h    | 5 +++++
 4 files changed, 11 insertions(+)

diff --git a/gas/config/tc-aarch64.c b/gas/config/tc-aarch64.c
index 7e76c1b0733..325ea2f99d8 100644
--- a/gas/config/tc-aarch64.c
+++ b/gas/config/tc-aarch64.c
@@ -10239,6 +10239,7 @@ static const struct aarch64_option_cpu_value_table aarch64_features[] = {
 			AARCH64_FEATURE (SIMD)},
   {"fp",		AARCH64_FEATURE (FP), AARCH64_NO_FEATURES},
   {"lse",		AARCH64_FEATURE (LSE), AARCH64_NO_FEATURES},
+  {"lse128",		AARCH64_FEATURES (2, LSE, LSE128), AARCH64_NO_FEATURES},
   {"simd",		AARCH64_FEATURE (SIMD), AARCH64_FEATURE (FP)},
   {"pan",		AARCH64_FEATURE (PAN), AARCH64_NO_FEATURES},
   {"lor",		AARCH64_FEATURE (LOR), AARCH64_NO_FEATURES},
diff --git a/gas/doc/c-aarch64.texi b/gas/doc/c-aarch64.texi
index a3ca714c299..b9fddd6a7f9 100644
--- a/gas/doc/c-aarch64.texi
+++ b/gas/doc/c-aarch64.texi
@@ -263,6 +263,8 @@ automatically cause those extensions to be disabled.
  @tab Enable Check Feature Status Extension.
 @item @code{gcs} @tab N/A @tab No
  @tab Enable Guarded Control Stack Extension.
+@item @code{lse128} @Armv9.4-A @tab No
+ @tab Enable the 128-bit Atomic Instructions extension.  This implies @code{lse}.
 @end multitable
 
 @node AArch64 Syntax
diff --git a/include/opcode/aarch64.h b/include/opcode/aarch64.h
index 2b7e633fae2..3dd55f1438e 100644
--- a/include/opcode/aarch64.h
+++ b/include/opcode/aarch64.h
@@ -165,6 +165,8 @@ enum aarch64_feature_bit {
   AARCH64_FEATURE_GCS,
   /* SME2.  */
   AARCH64_FEATURE_SME2,
+  /* LSE128.  */
+  AARCH64_FEATURE_LSE128,
   AARCH64_NUM_FEATURES
 };
 
@@ -855,6 +857,7 @@ enum aarch64_insn_class
   log_imm,
   log_shift,
   lse_atomic,
+  lse128_atomic,
   movewide,
   pcreladdr,
   ic_system,
diff --git a/opcodes/aarch64-tbl.h b/opcodes/aarch64-tbl.h
index 150b042d7ee..58787fbc4a9 100644
--- a/opcodes/aarch64-tbl.h
+++ b/opcodes/aarch64-tbl.h
@@ -2470,6 +2470,8 @@ static const aarch64_feature_set aarch64_feature_crc =
   AARCH64_FEATURE (CRC);
 static const aarch64_feature_set aarch64_feature_lse =
   AARCH64_FEATURE (LSE);
+static const aarch64_feature_set aarch64_feature_lse128 =
+  AARCH64_FEATURES (2, LSE, LSE128);
 static const aarch64_feature_set aarch64_feature_lor =
   AARCH64_FEATURE (LOR);
 static const aarch64_feature_set aarch64_feature_rdma =
@@ -2582,6 +2584,7 @@ static const aarch64_feature_set aarch64_feature_gcs =
 #define SIMD		&aarch64_feature_simd
 #define CRC		&aarch64_feature_crc
 #define LSE		&aarch64_feature_lse
+#define LSE128		&aarch64_feature_lse128
 #define LOR		&aarch64_feature_lor
 #define RDMA		&aarch64_feature_rdma
 #define FP_F16		&aarch64_feature_fp_f16
@@ -2649,6 +2652,8 @@ static const aarch64_feature_set aarch64_feature_gcs =
   { NAME, OPCODE, MASK, CLASS, 0, CRC, OPS, QUALS, FLAGS, 0, 0, NULL }
 #define _LSE_INSN(NAME,OPCODE,MASK,CLASS,OPS,QUALS,FLAGS) \
   { NAME, OPCODE, MASK, CLASS, 0, LSE, OPS, QUALS, FLAGS, 0, 0, NULL }
+#define _LSE128_INSN(NAME,OPCODE,MASK,CLASS,OPS,QUALS,FLAGS) \
+  { NAME, OPCODE, MASK, CLASS, 0, LSE128, OPS, QUALS, FLAGS, 0, 0, NULL }
 #define _LOR_INSN(NAME,OPCODE,MASK,CLASS,OPS,QUALS,FLAGS) \
   { NAME, OPCODE, MASK, CLASS, 0, LOR, OPS, QUALS, FLAGS, 0, 0, NULL }
 #define RDMA_INSN(NAME,OPCODE,MASK,CLASS,OPS,QUALS,FLAGS) \
-- 
2.41.0