[BINUTILS, AARCH64, 3/8] Add Pointer Arithmetic instructions in Memory Tagging Extension

This patch is part of the patch series to add support for ARMv8.5-A
Memory Tagging Extensions which is an optional extension to
ARMv8.5-A and is enabled using the +memtag command line option.

This patch add support to the Pointer Arithmetic instructions from
MTE. These are the following instructions added in this patch:
- SUBP <Xd>, <Xn|SP>, <Xm|SP>
- SUBPS <Xd>, <Xn|SP>, <Xm|SP>
- CMPP <Xn|SP>, <Xm|SP>
where CMPP is an alias to SUBPS XZR, <Xn|SP>, <Xm|SP>

where
<Xd> : Is the 64-bit destination GPR.
<Xn|SP> : Is the 64-bit first source GPR or Stack pointer.
<Xm|SP> : Is the 64-bit second source GPR or Stack pointer.

*** opcodes/ChangeLog ***

2018-11-12  Sudakshina Das  <sudi.das@arm.com>

	* aarch64-tbl.h (aarch64_opcode_table): Add subp, subps and cmpp.
	* aarch64-asm-2.c: Regenerated.
	* aarch64-dis-2.c: Regenerated.
	* aarch64-opc-2.c: Regenerated.

*** gas/ChangeLog ***

2018-11-12  Sudakshina Das  <sudi.das@arm.com>

	* testsuite/gas/aarch64/armv8_5-a-memtag.s: Add tests for subp,
	subps and cmpp.
	* testsuite/gas/aarch64/armv8_5-a-memtag.d: Likewise.
	* testsuite/gas/aarch64/illegal-memtag.s: Likewise.
	* testsuite/gas/aarch64/illegal-memtag.l: Likewise.

4 files changed, 58 insertions, 0 deletions

diff --git a/gas/testsuite/gas/aarch64/armv8_5-a-memtag.d b/gas/testsuite/gas/aarch64/armv8_5-a-memtag.d
index 4610461..a7cb6c4 100644
--- a/gas/testsuite/gas/aarch64/armv8_5-a-memtag.d
+++ b/gas/testsuite/gas/aarch64/armv8_5-a-memtag.d
@@ -33,3 +33,25 @@ Disassembly of section \.text:
 .*:	d180037b 	subg	x27, x27, #0x0, #0x0
 .*:	d1bf3fe0 	subg	x0, sp, #0x3f0, #0xf
 .*:	d1bf141f 	subg	sp, x0, #0x3f0, #0x5
+.*:	9ac00000 	subp	x0, x0, x0
+.*:	9ac0001b 	subp	x27, x0, x0
+.*:	9ac00360 	subp	x0, x27, x0
+.*:	9adb0000 	subp	x0, x0, x27
+.*:	9adb037b 	subp	x27, x27, x27
+.*:	9ac003e0 	subp	x0, sp, x0
+.*:	9adf0000 	subp	x0, x0, sp
+.*:	9ac0001f 	subp	xzr, x0, x0
+.*:	bac00000 	subps	x0, x0, x0
+.*:	bac0001b 	subps	x27, x0, x0
+.*:	bac00360 	subps	x0, x27, x0
+.*:	badb0000 	subps	x0, x0, x27
+.*:	badb037b 	subps	x27, x27, x27
+.*:	bac003e0 	subps	x0, sp, x0
+.*:	badf0000 	subps	x0, x0, sp
+.*:	bac0001f 	cmpp	x0, x0
+.*:	bac0001f 	cmpp	x0, x0
+.*:	bac0037f 	cmpp	x27, x0
+.*:	badb001f 	cmpp	x0, x27
+.*:	badb037f 	cmpp	x27, x27
+.*:	bac003ff 	cmpp	sp, x0
+.*:	badf001f 	cmpp	x0, sp
diff --git a/gas/testsuite/gas/aarch64/armv8_5-a-memtag.s b/gas/testsuite/gas/aarch64/armv8_5-a-memtag.s
index 96a3f37..f17f87e 100644
--- a/gas/testsuite/gas/aarch64/armv8_5-a-memtag.s
+++ b/gas/testsuite/gas/aarch64/armv8_5-a-memtag.s
@@ -35,3 +35,23 @@ func:
 	expand_2_reg subg
 	subg x0, sp, #0x3f0, #0xf
 	subg sp, x0, #0x3f0, #0x5
+
+	# SUBP
+	expand_3_reg subp
+	subp x0, sp, x0
+	subp x0, x0, sp
+	subp xzr, x0, x0
+
+	# SUBPS
+	expand_3_reg subps
+	subps x0, sp, x0
+	subps x0, x0, sp
+	subps xzr, x0, x0
+
+	# CMPP
+	cmpp x0, x0
+	cmpp x27, x0
+	cmpp x0, x27
+	cmpp x27, x27
+	cmpp sp, x0
+	cmpp x0, sp
diff --git a/gas/testsuite/gas/aarch64/illegal-memtag.l b/gas/testsuite/gas/aarch64/illegal-memtag.l
index 501faa7..4da0c35 100644
--- a/gas/testsuite/gas/aarch64/illegal-memtag.l
+++ b/gas/testsuite/gas/aarch64/illegal-memtag.l
@@ -12,3 +12,11 @@
 [^:]*:[0-9]+: Error: operand 2 must be an integer or stack pointer register -- `gmi x1,xzr,x3'
 [^:]*:[0-9]+: Error: operand 1 must be an integer or stack pointer register -- `addg xzr,x2,#0,#0'
 [^:]*:[0-9]+: Error: operand 2 must be an integer or stack pointer register -- `subg x1,xzr,#0,#0'
+[^:]*:[0-9]+: Error: operand 1 must be an integer register -- `subp sp,x1,x2'
+[^:]*:[0-9]+: Error: operand 2 must be an integer or stack pointer register -- `subp x1,xzr,x2'
+[^:]*:[0-9]+: Error: operand 3 must be an integer or stack pointer register -- `subp x1,x2,xzr'
+[^:]*:[0-9]+: Error: operand 1 must be an integer register -- `subps sp,x1,x2'
+[^:]*:[0-9]+: Error: operand 2 must be an integer or stack pointer register -- `subps x1,xzr,x2'
+[^:]*:[0-9]+: Error: operand 3 must be an integer or stack pointer register -- `subps x1,x2,xzr'
+[^:]*:[0-9]+: Error: operand 1 must be an integer or stack pointer register -- `cmpp xzr,x2'
+[^:]*:[0-9]+: Error: operand 2 must be an integer or stack pointer register -- `cmpp x2,xzr'
diff --git a/gas/testsuite/gas/aarch64/illegal-memtag.s b/gas/testsuite/gas/aarch64/illegal-memtag.s
index 05f3ead..7eab07f 100644
--- a/gas/testsuite/gas/aarch64/illegal-memtag.s
+++ b/gas/testsuite/gas/aarch64/illegal-memtag.s
@@ -17,3 +17,11 @@ func:
 	gmi x1, xzr, x3
 	addg xzr, x2, #0, #0
 	subg x1, xzr, #0, #0
+	subp sp, x1, x2
+	subp x1, xzr, x2
+	subp x1, x2, xzr
+	subps sp, x1, x2
+	subps x1, xzr, x2
+	subps x1, x2, xzr
+	cmpp xzr, x2
+	cmpp x2, xzr