x86: Add support for Intel HRESET instruction

gas/

	* NEWS: Add Intel HRESET.
	* config/tc-i386.c (cpu_arch): Add .hreset.
	(cpu_noarch): Likewise.
	* doc/c-i386.texi: Document .hreset, nohreset.
	* testsuite/gas/i386/i386.exp: Run HRESET tests.
	* testsuite/gas/i386/hreset.d: New file.
	* testsuite/gas/i386/x86-64-hreset.d: Likewise.
	* testsuite/gas/i386/hreset.s: Likewise.

opcodes/

	* i386-dis.c (PREFIX_0F3A0F): New.
	(MOD_0F3A0F_PREFIX_1): Likewise.
	(REG_0F3A0F_PREFIX_1_MOD_3): Likewise.
	(RM_0F3A0F_P_1_MOD_3_REG_0): Likewise.
	(prefix_table): Add PREFIX_0F3A0F.
	(mod_table): Add MOD_0F3A0F_PREFIX_1.
	(reg_table): Add REG_0F3A0F_PREFIX_1_MOD_3.
	(rm_table): Add RM_0F3A0F_P_1_MOD_3_REG_0.
	* i386-gen.c (cpu_flag_init): Add HRESET_FLAGS,
	CPU_ANY_HRESET_FLAGS.
	(cpu_flags): Add CpuHRESET.
	(output_i386_opcode): Allow 4 byte base_opcode.
	* i386-opc.h (enum): Add CpuHRESET.
	(i386_cpu_flags): Add cpuhreset.
	* i386-opc.tbl: Add Intel HRESET instruction.
	* i386-init.h: Regenerate.
	* i386-tbl.h: Likewise.

8 files changed, 50 insertions, 1 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 7a55863..ade0076 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,5 +1,16 @@
 2020-10-14  Lili Cui  <lili.cui@intel.com>
 
+	* NEWS: Add Intel HRESET.
+	* config/tc-i386.c (cpu_arch): Add .hreset.
+	(cpu_noarch): Likewise.
+	* doc/c-i386.texi: Document .hreset, nohreset.
+	* testsuite/gas/i386/i386.exp: Run HRESET tests.
+	* testsuite/gas/i386/hreset.d: New file.
+	* testsuite/gas/i386/x86-64-hreset.d: Likewise.
+	* testsuite/gas/i386/hreset.s: Likewise.
+
+2020-10-14  Lili Cui  <lili.cui@intel.com>
+
 	* NEWS: Add Intel UINTR.
 	* config/tc-i386.c (cpu_arch): Add .uintr.
 	(cpu_noarch): Likewise.
diff --git a/gas/NEWS b/gas/NEWS
index ff757fe..3914775 100644
--- a/gas/NEWS
+++ b/gas/NEWS
@@ -1,5 +1,7 @@
 -*- text -*-
 
+* Add support for Intel HRESET instruction.
+
 * Add support for Intel UINTR instructions.
 
 * Support non-absolute segment values for i386 lcall and ljmp.
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c
index 2de7e74..6df250a 100644
--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -1242,6 +1242,8 @@ static const arch_entry cpu_arch[] =
     CPU_WIDEKL_FLAGS, 0 },
   { STRING_COMMA_LEN (".uintr"), PROCESSOR_UNKNOWN,
     CPU_UINTR_FLAGS, 0 },
+  { STRING_COMMA_LEN (".hreset"), PROCESSOR_UNKNOWN,
+    CPU_HRESET_FLAGS, 0 },
 };
 
 static const noarch_entry cpu_noarch[] =
@@ -1295,6 +1297,7 @@ static const noarch_entry cpu_noarch[] =
   { STRING_COMMA_LEN ("nokl"), CPU_ANY_KL_FLAGS },
   { STRING_COMMA_LEN ("nowidekl"), CPU_ANY_WIDEKL_FLAGS },
   { STRING_COMMA_LEN ("nouintr"), CPU_ANY_UINTR_FLAGS },
+  { STRING_COMMA_LEN ("nohreset"), CPU_ANY_HRESET_FLAGS },
 };
 
 #ifdef I386COFF
diff --git a/gas/doc/c-i386.texi b/gas/doc/c-i386.texi
index 5f58b89..6fd2f42 100644
--- a/gas/doc/c-i386.texi
+++ b/gas/doc/c-i386.texi
@@ -193,6 +193,7 @@ accept various extension mnemonics.  For example,
 @code{nokl},
 @code{widekl},
 @code{nowidekl},
+@code{hreset},
 @code{avx512f},
 @code{avx512cd},
 @code{avx512er},
@@ -239,6 +240,7 @@ accept various extension mnemonics.  For example,
 @code{amx_tile},
 @code{noamx_tile},
 @code{nouintr},
+@code{nohreset},
 @code{vmx},
 @code{vmfunc},
 @code{smx},
@@ -1513,7 +1515,7 @@ supported on the CPU specified.  The choices for @var{cpu_type} are:
 @item @samp{.shstk} @tab @samp{.gfni} @tab @samp{.vaes} @tab @samp{.vpclmulqdq}
 @item @samp{.movdiri} @tab @samp{.movdir64b} @tab @samp{.enqcmd} @tab @samp{.tsxldtrk}
 @item @samp{.amx_int8} @tab @samp{.amx_bf16} @tab @samp{.amx_tile}
-@item @samp{.kl} @tab @samp{.widekl} @tab @samp{.uintr}
+@item @samp{.kl} @tab @samp{.widekl} @tab @samp{.uintr} @tab @samp{.hreset}
 @item @samp{.3dnow} @tab @samp{.3dnowa} @tab @samp{.sse4a} @tab @samp{.sse5}
 @item @samp{.syscall} @tab @samp{.rdtscp} @tab @samp{.svme}
 @item @samp{.lwp} @tab @samp{.fma4} @tab @samp{.xop} @tab @samp{.cx16}
diff --git a/gas/testsuite/gas/i386/hreset.d b/gas/testsuite/gas/i386/hreset.d
new file mode 100644
index 0000000..0254865
--- /dev/null
+++ b/gas/testsuite/gas/i386/hreset.d
@@ -0,0 +1,12 @@
+#as:
+#objdump: -dw
+#name: HRESET insns
+#source: hreset.s
+
+.*: +file format .*
+
+Disassembly of section \.text:
+
+0+ <_start>:
+[ 	]*[a-f0-9]+:[ 	]*f3 0f 3a f0 c0 08[ 	]*hreset \$0x8
+#pass
diff --git a/gas/testsuite/gas/i386/hreset.s b/gas/testsuite/gas/i386/hreset.s
new file mode 100644
index 0000000..ff0887c
--- /dev/null
+++ b/gas/testsuite/gas/i386/hreset.s
@@ -0,0 +1,5 @@
+# Check HRESET instructions.
+
+	.text
+_start:
+	hreset $0x8
diff --git a/gas/testsuite/gas/i386/i386.exp b/gas/testsuite/gas/i386/i386.exp
index 66366a0..a761767 100644
--- a/gas/testsuite/gas/i386/i386.exp
+++ b/gas/testsuite/gas/i386/i386.exp
@@ -493,6 +493,7 @@ if [gas_32_check] then {
     run_dump_test "serialize"
     run_dump_test "tdx"
     run_dump_test "tsxldtrk"
+    run_dump_test "hreset"
     run_dump_test "vp2intersect"
     run_dump_test "vp2intersect-intel"
     run_list_test "vp2intersect-inval-bcast"
@@ -1106,6 +1107,7 @@ if [gas_64_check] then {
     run_dump_test "x86-64-serialize"
     run_dump_test "x86-64-tdx"
     run_dump_test "x86-64-tsxldtrk"
+    run_dump_test "x86-64-hreset"
     run_dump_test "x86-64-vp2intersect"
     run_dump_test "x86-64-vp2intersect-intel"
     run_list_test "x86-64-vp2intersect-inval-bcast"
diff --git a/gas/testsuite/gas/i386/x86-64-hreset.d b/gas/testsuite/gas/i386/x86-64-hreset.d
new file mode 100644
index 0000000..3f0b0b8
--- /dev/null
+++ b/gas/testsuite/gas/i386/x86-64-hreset.d
@@ -0,0 +1,12 @@
+#as:
+#objdump: -dw
+#name: x86_64 HRESET insns
+#source: hreset.s
+
+.*: +file format .*
+
+Disassembly of section \.text:
+
+0+ <_start>:
+[ 	]*[a-f0-9]+:[ 	]*f3 0f 3a f0 c0 08[ 	]*hreset \$0x8
+#pass