aarch64: Add FEAT_ITE support

This patch add support for FEAT_ITE "Instrumentation Extension" adding
the "trcit" instruction.

This is enabled by the +ite march flag.

gas/config/tc-aarch64.c

@@ -10296,6 +10296,7 @@ static const struct aarch64_option_cpu_value_table aarch64_features[] = {
   {"gcs",		AARCH64_FEATURE (GCS), AARCH64_NO_FEATURES},
   {"the",		AARCH64_FEATURE (THE), AARCH64_NO_FEATURES},
   {"rasv2",		AARCH64_FEATURE (RASv2), AARCH64_FEATURE (RAS)},
+  {"ite",		AARCH64_FEATURE (ITE), AARCH64_NO_FEATURES},
   {NULL,		AARCH64_NO_FEATURES, AARCH64_NO_FEATURES},
 };
 

gas/doc/c-aarch64.texi

@@ -272,6 +272,8 @@ automatically cause those extensions to be disabled.
  @tab Enable the Reliability, Availability and Serviceability extension v2.
 @item @code{predres2} @tab ARMv8-A/Armv9-A @tab ARMv8.9-A/Armv9.4-A or later
  @tab Enable Prediction instructions.
+@item @code{ite} @tab N/A @tab no
+ @tab Enable TRCIT instruction.
 @end multitable
 
 @node AArch64 Syntax

gas/testsuite/gas/aarch64/illegal-ite1-1.d

@@ -0,0 +1,3 @@
+#as: -march=armv8-a
+#source: ite1.s
+#error_output: illegal-ite1-1.l

gas/testsuite/gas/aarch64/illegal-ite1-1.l

@@ -0,0 +1,2 @@
+[^:]*: Assembler messages:
+[^:]*:[0-9]+: Error: selected processor does not support `trcit x1'

gas/testsuite/gas/aarch64/ite1.d

@@ -0,0 +1,9 @@
+#as: -march=armv9.4-a+ite
+#objdump: -dr
+
+.*:     file format .*
+
+Disassembly of section \.text:
+
+0+ <.*>:
+.*:	d50b72e1 	trcit	x1

gas/testsuite/gas/aarch64/ite1.s

@@ -0,0 +1,3 @@
+/* File to test the +ite option.  */
+func:
+	trcit x1

include/opcode/aarch64.h

@@ -199,6 +199,8 @@ enum aarch64_feature_bit {
   AARCH64_FEATURE_TCR2,
   /* Speculation Prediction Restriction instructions.  */
   AARCH64_FEATURE_PREDRES2,
+  /* Instrumentation Extension.  */
+  AARCH64_FEATURE_ITE,
   AARCH64_NUM_FEATURES
 };
 

opcodes/aarch64-asm-2.c

@@ -465,6 +465,7 @@ aarch64_find_real_opcode (const aarch64_opcode *opcode)
     case 1236:	/* dsb */
       value = 1236;	/* --> dsb.  */
       break;
+    case 3194:	/* trcit */
     case 1264:	/* cosp */
     case 1263:	/* cpp */
     case 1262:	/* dvp */

opcodes/aarch64-dis-2.c

@@ -31324,7 +31324,7 @@ aarch64_find_alias_opcode (const aarch64_opcode *opcode)
     case 1215: value = 3193; break;	/* hint --> clrbhb.  */
     case 1235: value = 1239; break;	/* dsb --> pssbb.  */
     case 1236: value = 1236; break;	/* dsb --> dsb.  */
-    case 1254: value = 1264; break;	/* sys --> cosp.  */
+    case 1254: value = 3194; break;	/* sys --> trcit.  */
     case 1259: value = 1259; break;	/* wfet --> wfet.  */
     case 1260: value = 1260; break;	/* wfit --> wfit.  */
     case 1325: value = 2078; break;	/* and --> bic.  */
@@ -31511,6 +31511,7 @@ aarch64_find_next_alias_opcode (const aarch64_opcode *opcode)
     case 1239: value = 1238; break;	/* pssbb --> ssbb.  */
     case 1238: value = 1237; break;	/* ssbb --> dfb.  */
     case 1237: value = 1235; break;	/* dfb --> dsb.  */
+    case 3194: value = 1264; break;	/* trcit --> cosp.  */
     case 1264: value = 1263; break;	/* cosp --> cpp.  */
     case 1263: value = 1262; break;	/* cpp --> dvp.  */
     case 1262: value = 1261; break;	/* dvp --> cfp.  */

opcodes/aarch64-tbl.h

@@ -2580,6 +2580,8 @@ static const aarch64_feature_set aarch64_feature_chk =
   AARCH64_FEATURE (CHK);
 static const aarch64_feature_set aarch64_feature_gcs =
   AARCH64_FEATURE (GCS);
+static const aarch64_feature_set aarch64_feature_ite =
+  AARCH64_FEATURE (ITE);
 
 #define CORE		&aarch64_feature_v8
 #define FP		&aarch64_feature_fp
@@ -2642,6 +2644,7 @@ static const aarch64_feature_set aarch64_feature_gcs =
 #define CSSC	  &aarch64_feature_cssc
 #define CHK	  &aarch64_feature_chk
 #define GCS	  &aarch64_feature_gcs
+#define ITE	  &aarch64_feature_ite
 
 #define CORE_INSN(NAME,OPCODE,MASK,CLASS,OP,OPS,QUALS,FLAGS) \
   { NAME, OPCODE, MASK, CLASS, OP, CORE, OPS, QUALS, FLAGS, 0, 0, NULL }
@@ -2847,6 +2850,9 @@ static const aarch64_feature_set aarch64_feature_gcs =
 #define PREDRES2_INSN(NAME,OPCODE,MASK,CLASS,OPS,QUALS,FLAGS) \
   { NAME, OPCODE, MASK, CLASS, 0, PREDRES2, OPS, QUALS, FLAGS, 0, 0, NULL }
 
+#define ITE_INSN(NAME,OPCODE,MASK,CLASS,OPS,QUALS,FLAGS) \
+  { NAME, OPCODE, MASK, CLASS, 0, ITE, OPS, QUALS, FLAGS, 0, 0, NULL }
+
 const struct aarch64_opcode aarch64_opcode_table[] =
 {
   /* Add/subtract (with carry).  */
@@ -6117,6 +6123,8 @@ const struct aarch64_opcode aarch64_opcode_table[] =
      command-line flags.  */
   CORE_INSN ("clrbhb", 0xd50322df, 0xffffffff, ic_system, 0, OP0 (), {}, F_ALIAS),
 
+  ITE_INSN ("trcit", 0xd50b72e0, 0xffffffe0, ic_system, OP1 (Rt), QL_I1X, F_ALIAS),
+
   {0, 0, 0, 0, 0, 0, {}, {}, 0, 0, 0, NULL},
 };