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[PATCH, BINUTILS, ARM] Add SSBB and PSSBB


Hi

This patch adds the following speculation barrier instructions
to the ARM assembler and disassembler according to
https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability/download-the-whitepaper

SSBB
PSSBB

These are added retrospectively to all older architectures,
and thus have been added to ARM_EXT_V3 for AArch32 and ARM_EXT_V6T2
for Thumb2.

Testing done: Builds and reg tests all pass on arm-none-linux-gnueabi.
Updated test to check.

Is this ok for trunk? I do not have commit rights. If it is ok can someone
commit it on my behalf.

Thanks
Sudi

*** opcodes/ChangeLog ***

2018-xx-xx  Sudakshina Das  <sudi.das@arm.com>

	* arm-dis.c (arm_opcodes): Add ssbb and pssbb and move
	csdb together with them.
	(thumb32_opcodes): Likewise.

*** gas/ChangeLog ***

2018-xx-xx  Sudakshina Das  <sudi.das@arm.com>

	* config/tc-arm.c (insns): Add new ssbb and pssbb instructions.
	* testsuite/gas/arm/csdb.s: Add new tests for ssbb and pssbb.
	* testsuite/gas/arm/csdb.d: Likewise
	* testsuite/gas/arm/thumb2_it_bad.s: Likewise.
	* testsuite/gas/arm/thumb2_it_bad.l: Likewise.
	* testsuite/gas/arm/barrier.d: Update with ssbb.
	* testsuite/gas/arm/barrier-thumb.d: Likewise.
diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index ef814ff758602e5cfade4fc2581dd46fa2ca6d92..9f3988a64430918266f30274f0e4f4d11159b0a2 100644
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -20051,6 +20051,8 @@ static const struct asm_opcode insns[] =
 #define THUMB_VARIANT  & arm_ext_v6t2
 
  TUE("csdb",	320f014, f3af8014, 0, (), noargs, t_csdb),
+ TUF("ssbb",	57ff040, f3bf8f40, 0, (), noargs, t_csdb),
+ TUF("pssbb",	57ff044, f3bf8f44, 0, (), noargs, t_csdb),
 
 #undef  ARM_VARIANT
 #define ARM_VARIANT    & arm_ext_v6t2
diff --git a/gas/testsuite/gas/arm/barrier-thumb.d b/gas/testsuite/gas/arm/barrier-thumb.d
index 9194372aefe7e8e259f220a24090f20130a443a9..fd163fc57988ff49bae11d219a77fa2a23c98ee8 100644
--- a/gas/testsuite/gas/arm/barrier-thumb.d
+++ b/gas/testsuite/gas/arm/barrier-thumb.d
@@ -59,7 +59,7 @@ Disassembly of section .text:
 000000b8 <[^>]*> f3bf 8f46 	dsb	(nshst|unst|#6)
 000000bc <[^>]*> f3bf 8f43 	dsb	(osh|#3)
 000000c0 <[^>]*> f3bf 8f6f 	isb	(sy|#15)
-000000c4 <[^>]*> f3bf 8f40 	dsb	#0
+000000c4 <[^>]*> f3bf 8f40 	ssbb
 000000c8 <[^>]*> f3bf 8f4f 	dsb	(sy|#15)
 000000cc <[^>]*> f3bf 8f50 	dmb	#0
 000000d0 <[^>]*> f3bf 8f5f 	dmb	(sy|#15)
diff --git a/gas/testsuite/gas/arm/barrier.d b/gas/testsuite/gas/arm/barrier.d
index a09b1ea5ee4d0422594deed83b8bb49f99432fe4..f74702653299e4747b03b11786fed8008981b669 100644
--- a/gas/testsuite/gas/arm/barrier.d
+++ b/gas/testsuite/gas/arm/barrier.d
@@ -58,7 +58,7 @@ Disassembly of section .text:
 000000b8 <[^>]*> f57ff046 	dsb	(nshst|unst|#6)
 000000bc <[^>]*> f57ff043 	dsb	(osh|#3)
 000000c0 <[^>]*> f57ff06f 	isb	(sy|#15)
-000000c4 <[^>]*> f57ff040 	dsb	#0
+000000c4 <[^>]*> f57ff040 	ssbb
 000000c8 <[^>]*> f57ff04f 	dsb	(sy|#15)
 000000cc <[^>]*> f57ff050 	dmb	#0
 000000d0 <[^>]*> f57ff05f 	dmb	(sy|#15)
diff --git a/gas/testsuite/gas/arm/csdb.d b/gas/testsuite/gas/arm/csdb.d
index baf585590b53ddc84472522fd5805241e2e9482b..db73907be4337b4e2efb1f534fb75c01e85cc4dd 100644
--- a/gas/testsuite/gas/arm/csdb.d
+++ b/gas/testsuite/gas/arm/csdb.d
@@ -5,6 +5,9 @@
 .*: +file format .*arm.*
 
 Disassembly of section .text:
-0+000 <[^>]*> f3af 8014 ?	csdb
-0+004 <[^>]*> e320f014 ?	csdb
-
+.*> f3af 8014 ?	csdb
+.*> f3bf 8f40 ?	ssbb
+.*> f3bf 8f44 ?	pssbb
+.*> e320f014 ?	csdb
+.*> f57ff040 ?	ssbb
+.*> f57ff044 ?	pssbb
diff --git a/gas/testsuite/gas/arm/csdb.s b/gas/testsuite/gas/arm/csdb.s
index 133a5f093e6af6eca15b4323f4d98f7293afee3f..f31f5df0e257032fc558e8a0bf971c9c6e0a6a44 100644
--- a/gas/testsuite/gas/arm/csdb.s
+++ b/gas/testsuite/gas/arm/csdb.s
@@ -2,5 +2,9 @@
 .thumb
 .syntax unified
 csdb
+ssbb
+pssbb
 .arm
 csdb
+ssbb
+pssbb
diff --git a/gas/testsuite/gas/arm/thumb2_it_bad.l b/gas/testsuite/gas/arm/thumb2_it_bad.l
index da9341fccfc598fb50b20b213b156bfdd01e01e5..95ef2739bd6d42c7ee01474862f2633a85c56787 100644
--- a/gas/testsuite/gas/arm/thumb2_it_bad.l
+++ b/gas/testsuite/gas/arm/thumb2_it_bad.l
@@ -11,3 +11,5 @@
 [^:]*:20: Error: instruction not allowed in IT block -- `setendeq le'
 [^:]*:22: Error: IT falling in the range of a previous IT block -- `iteq eq'
 [^:]*:25: Error: instruction not allowed in IT block -- `csdbeq'
+[^:]*:26: Error: instruction not allowed in IT block -- `ssbbeq'
+[^:]*:27: Error: instruction not allowed in IT block -- `pssbbeq'
diff --git a/gas/testsuite/gas/arm/thumb2_it_bad.s b/gas/testsuite/gas/arm/thumb2_it_bad.s
index 72f305dc582c2e7672aa2e12dbc282fbf3324962..7cdb9f1a78565010f5668b7f1f06c326cadc47f6 100644
--- a/gas/testsuite/gas/arm/thumb2_it_bad.s
+++ b/gas/testsuite/gas/arm/thumb2_it_bad.s
@@ -21,6 +21,8 @@ thumb2_it_bad:
 	it	eq
 	iteq	eq
 	nop
-	it	eq
+	ittt	eq
 	csdbeq
+	ssbbeq
+	pssbbeq
 foo:
diff --git a/opcodes/arm-dis.c b/opcodes/arm-dis.c
index 8bcec13ddf2ae999ddce8cb82738d9cd4ae38d68..cb2de1b87be117a94ad2782d8d79350ff69e2c63 100644
--- a/opcodes/arm-dis.c
+++ b/opcodes/arm-dis.c
@@ -1846,6 +1846,11 @@ static const struct opcode32 arm_opcodes[] =
   /* MP Extension instructions.  */
   {ARM_FEATURE_CORE_LOW (ARM_EXT_MP), 0xf410f000, 0xfc70f000, "pldw\t%a"},
 
+  /* Speculation Barriers.  */
+  {ARM_FEATURE_CORE_LOW (ARM_EXT_V3), 0xe320f014, 0xffffffff, "csdb"},
+  {ARM_FEATURE_CORE_LOW (ARM_EXT_V3), 0xf57ff040, 0xffffffff, "ssbb"},
+  {ARM_FEATURE_CORE_LOW (ARM_EXT_V3), 0xf57ff044, 0xffffffff, "pssbb"},
+
   /* V7 instructions.  */
   {ARM_FEATURE_CORE_LOW (ARM_EXT_V7), 0xf450f000, 0xfd70f000, "pli\t%P"},
   {ARM_FEATURE_CORE_LOW (ARM_EXT_V7), 0x0320f0f0, 0x0ffffff0, "dbg%c\t#%0-3d"},
@@ -1901,9 +1906,6 @@ static const struct opcode32 arm_opcodes[] =
   {ARM_FEATURE_CORE_LOW (ARM_EXT_V6K),
     0x01e00f90, 0x0ff00ff0, "strexh%c\t%12-15R, %0-3R, [%16-19R]"},
 
-  /* CSDB.  */
-  {ARM_FEATURE_CORE_LOW (ARM_EXT_V3), 0xe320f014, 0xffffffff, "csdb"},
-
   /* ARM V6K NOP hints.  */
   {ARM_FEATURE_CORE_LOW (ARM_EXT_V6K),
     0x0320f001, 0x0fffffff, "yield%c"},
@@ -2799,6 +2801,11 @@ static const struct opcode32 thumb32_opcodes[] =
   {ARM_FEATURE_COPROC (CRC_EXT_ARMV8),
     0xfad0f0a0, 0xfff0f0f0, "crc32cw\t%8-11R, %16-19R, %0-3R"},
 
+  /* Speculation Barriers.  */
+  {ARM_FEATURE_CORE_LOW (ARM_EXT_V6T2), 0xf3af8014, 0xffffffff, "csdb"},
+  {ARM_FEATURE_CORE_LOW (ARM_EXT_V6T2), 0xf3bf8f40, 0xffffffff, "ssbb"},
+  {ARM_FEATURE_CORE_LOW (ARM_EXT_V6T2), 0xf3bf8f44, 0xffffffff, "pssbb"},
+
   /* V7 instructions.  */
   {ARM_FEATURE_CORE_LOW (ARM_EXT_V7), 0xf910f000, 0xff70f000, "pli%c\t%a"},
   {ARM_FEATURE_CORE_LOW (ARM_EXT_V7), 0xf3af80f0, 0xfffffff0, "dbg%c\t#%0-3d"},
@@ -2822,9 +2829,6 @@ static const struct opcode32 thumb32_opcodes[] =
   /* Security extension instructions.  */
   {ARM_FEATURE_CORE_LOW (ARM_EXT_SEC),  0xf7f08000, 0xfff0f000, "smc%c\t%K"},
 
-  /* CSDB.  */
-  {ARM_FEATURE_CORE_LOW (ARM_EXT_V6T2), 0xf3af8014, 0xffffffff, "csdb"},
-
   /* Instructions defined in the basic V6T2 set.  */
   {ARM_FEATURE_CORE_LOW (ARM_EXT_V6T2), 0xf3af8000, 0xffffffff, "nop%c.w"},
   {ARM_FEATURE_CORE_LOW (ARM_EXT_V6T2), 0xf3af8001, 0xffffffff, "yield%c.w"},

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