Add load-link, store-conditional paired EVA instructions

Add paired load-link and store-conditional instructions to the
EVA ASE for MIPS32R6[1].  These instructions are optional within
the EVA ASE.  Their presence is indicated by the XNP bit in the
Config5 register.

[1] "MIPS Architecture for Programmers Volume II-A: The MIPS32
     Instruction Set Manual", Imagination Technologies Ltd., Document
     Number: MD00086, Revision 6.06, December 15, 2016, Section 3.2
     "Alphabetical List of Instructions", pp. 230-231, pp. 357-360.

gas/
	* config/tc-mips.c (mips_set_ase): Handle ASE_EVA_R6.
	(macro) <M_LLWPE_AB, M_SCWPE_AB>: New cases.
	(mips_after_parse_args): Translate EVA to EVA_R6.
	* testsuite/gas/mips/ase-errors-1.s: Add new instructions.
	* testsuite/gas/mips/eva.s: Likewise.
	* testsuite/gas/mips/ase-errors-1.l: Check errors for
	 new instructions.
	* testsuite/gas/mips/mipsr6@eva.d: Check new test cases.

include/
	* opcode/mips.h (ASE_EVA_R6): New macro.
	(M_LLWPE_AB, M_SCWPE_AB): New enum values.

opcodes/
	* mips-dis.c (mips_calculate_combination_ases): Add ISA
	argument and set ASE_EVA_R6 appropriately.
	(set_default_mips_dis_options): Pass ISA to above.
	(parse_mips_dis_option): Likewise.
	* mips-opc.c (EVAR6): New macro.
	(mips_builtin_opcodes): Add llwpe, scwpe.

Derived from patch authored by Andrew Bennett <andrew.bennett@imgtec.com>

6 files changed, 91 insertions, 1 deletions

diff --git a/gas/ChangeLog b/gas/ChangeLog
index ec21153..e83a893 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,15 @@
+2019-05-06  Andrew Bennett  <andrew.bennett@imgtec.com>
+	    Faraz Shahbazker  <fshahbazker@wavecomp.com>
+
+	* config/tc-mips.c (mips_set_ase): Handle ASE_EVA_R6.
+	(macro) <M_LLWPE_AB, M_SCWPE_AB>: New cases.
+	(mips_after_parse_args): Translate EVA to EVA_R6.
+	* testsuite/gas/mips/ase-errors-1.s: Add new instructions.
+	* testsuite/gas/mips/eva.s: Likewise.
+	* testsuite/gas/mips/ase-errors-1.l: Check errors for
+	 new instructions.
+	* testsuite/gas/mips/mipsr6@eva.d: Check new test cases.
+
 2019-05-06  Alan Modra  <amodra@gmail.com>
 
 	* symbols.c (symbol_relc_make_sym): Do not access sym->sy_value
diff --git a/gas/config/tc-mips.c b/gas/config/tc-mips.c
index 091ea7b..6a945e3 100644
--- a/gas/config/tc-mips.c
+++ b/gas/config/tc-mips.c
@@ -2227,7 +2227,7 @@ mips_set_ase (const struct mips_ase *ase, struct mips_set_options *opts,
 
   /* Clear combination ASE flags, which need to be recalculated based on
      updated regular ASE settings.  */
-  opts->ase &= ~(ASE_MIPS16E2_MT | ASE_XPA_VIRT);
+  opts->ase &= ~(ASE_MIPS16E2_MT | ASE_XPA_VIRT | ASE_EVA_R6);
 
   if (enabled_p)
     opts->ase |= ase->flags;
@@ -2246,6 +2246,15 @@ mips_set_ase (const struct mips_ase *ase, struct mips_set_options *opts,
       mask |= ASE_MIPS16E2_MT;
     }
 
+  /* The EVA Extension has instructions which are only valid when the R6 ISA
+     is enabled.  This sets the ASE_EVA_R6 flag when both EVA and R6 ISA are
+     present.  */
+  if (((opts->ase & ASE_EVA) != 0) && ISA_IS_R6 (opts->isa))
+    {
+      opts->ase |= ASE_EVA_R6;
+      mask |= ASE_EVA_R6;
+    }
+
   return mask;
 }
 
@@ -12017,6 +12026,7 @@ macro (struct mips_cl_insn *ip, char *str)
       goto ld;
     case M_LLDP_AB:
     case M_LLWP_AB:
+    case M_LLWPE_AB:
       s = ip->insn_mo->name;
       fmt = "t,d,s";
       ll_sc_paired = 1;
@@ -12125,6 +12135,7 @@ macro (struct mips_cl_insn *ip, char *str)
       goto ld_st;
     case M_SCDP_AB:
     case M_SCWP_AB:
+    case M_SCWPE_AB:
       s = ip->insn_mo->name;
       fmt = "t,d,s";
       ll_sc_paired = 1;
@@ -15246,6 +15257,12 @@ mips_after_parse_args (void)
   file_mips_opts.isa = arch_info->isa;
   file_mips_opts.init_ase = arch_info->ase;
 
+  /* The EVA Extension has instructions which are only valid when the R6 ISA
+     is enabled.  This sets the ASE_EVA_R6 flag when both EVA and R6 ISA are
+     present.  */
+  if (((file_mips_opts.ase & ASE_EVA) != 0) && ISA_IS_R6 (file_mips_opts.isa))
+    file_mips_opts.ase |= ASE_EVA_R6;
+
   /* Set up initial mips_opts state.  */
   mips_opts = file_mips_opts;
 
diff --git a/gas/testsuite/gas/mips/ase-errors-1.l b/gas/testsuite/gas/mips/ase-errors-1.l
index 2c9fb9e..b51db4f 100644
--- a/gas/testsuite/gas/mips/ase-errors-1.l
+++ b/gas/testsuite/gas/mips/ase-errors-1.l
@@ -48,3 +48,7 @@
 .*:117: Warning: the `ginv' extension requires MIPS32 revision 6 or greater
 .*:120: Error: opcode not supported.* `ginvi \$a0'
 # ----------------------------------------------------------------------------
+.*:127: Error: opcode not supported .* `llwpe \$2,\$3,\$4'
+.*:128: Error: opcode not supported .* `scwpe \$2,\$3,\$4'
+.*:131: Error: opcode not supported .* `llwpe \$2,\$3,\$4'
+.*:132: Error: opcode not supported .* `scwpe \$2,\$3,\$4'
diff --git a/gas/testsuite/gas/mips/ase-errors-1.s b/gas/testsuite/gas/mips/ase-errors-1.s
index 8b679a3..7deeea1 100644
--- a/gas/testsuite/gas/mips/ase-errors-1.s
+++ b/gas/testsuite/gas/mips/ase-errors-1.s
@@ -119,6 +119,18 @@
 	.set noginv
 	ginvi $a0		# ERROR: ginv not enabled
 
+	.set mips32r6
+	.set eva
+	llwpe	$2, $3, $4	# OK
+	scwpe	$2, $3, $4	# OK
+	.set noeva
+	llwpe	$2, $3, $4	# ERROR: eva not enabled
+	scwpe	$2, $3, $4	# ERROR: eva not enabled
+	.set mips32r5
+	.set eva
+	llwpe	$2, $3, $4	# ERROR: only avaialable on R6
+	scwpe	$2, $3, $4	# ERROR: only avaialable on R6
+
 	# There should be no errors after this.
 	.set fp=32
 	.set mips1
diff --git a/gas/testsuite/gas/mips/eva.s b/gas/testsuite/gas/mips/eva.s
index 7865fb4..a8a7c05 100644
--- a/gas/testsuite/gas/mips/eva.s
+++ b/gas/testsuite/gas/mips/eva.s
@@ -615,3 +615,16 @@ test_eva:
 	prefe	11,($12)
 	prefe	13,MYDATA
 	prefe	5,%lo(foo)($6)
+
+	.ifdef r6
+	llwpe $2, $3, 0x1234
+	llwpe $2, $0, 0xabcd($0)
+	llwpe $0, $3, %lo(sync_mem)
+	llwpe $2, $2, 0xffffffff01234567($0)
+	llwpe $0, $0, sync_mem
+	scwpe $2, $3, 0x1234
+	scwpe $2, $0, 0xabcd($0)
+	scwpe $0, $3, %lo(sync_mem)
+	scwpe $2, $2, 0xffffffff01234567($0)
+	scwpe $0, $0, sync_mem
+	.endif
diff --git a/gas/testsuite/gas/mips/mipsr6@eva.d b/gas/testsuite/gas/mips/mipsr6@eva.d
index 79b6030..4400f95 100644
--- a/gas/testsuite/gas/mips/mipsr6@eva.d
+++ b/gas/testsuite/gas/mips/mipsr6@eva.d
@@ -949,4 +949,36 @@ Disassembly of section \.text:
 [ 0-9a-f]+:	24c10000 	addiu	\$1,\$6,0
 			[ 0-9a-f]+: R_MIPS_LO16	foo
 [ 0-9a-f]+:	7c250023 	prefe	0x5,0\(\$1\)
+[ 0-9a-f]+:	24021234 	li	\$2,4660
+[ 0-9a-f]+:	7c42186e 	llwpe	\$2,\$3,\$2
+[ 0-9a-f]+:	3c020001 	lui	\$2,0x1
+[ 0-9a-f]+:	2442abcd 	addiu	\$2,\$2,-21555
+[ 0-9a-f]+:	7c42006e 	llwpe	\$2,\$0,\$2
+[ 0-9a-f]+:	24030000 	li	\$3,0
+			[0-9a-f]+: R_MIPS_LO16	sync_mem
+[ 0-9a-f]+:	7c60186e 	llwpe	\$0,\$3,\$3
+[ 0-9a-f]+:	3c020123 	lui	\$2,0x123
+[ 0-9a-f]+:	24424567 	addiu	\$2,\$2,17767
+[ 0-9a-f]+:	7c42106e 	llwpe	\$2,\$2,\$2
+[ 0-9a-f]+:	3c010000 	lui	\$1,0x0
+			[0-9a-f]+: R_MIPS_HI16	sync_mem
+[ 0-9a-f]+:	24210000 	addiu	\$1,\$1,0
+			[0-9a-f]+: R_MIPS_LO16	sync_mem
+[ 0-9a-f]+:	7c20006e 	llwpe	\$0,\$0,\$1
+[ 0-9a-f]+:	24011234 	li	\$1,4660
+[ 0-9a-f]+:	7c22185e 	scwpe	\$2,\$3,\$1
+[ 0-9a-f]+:	3c010001 	lui	\$1,0x1
+[ 0-9a-f]+:	2421abcd 	addiu	\$1,\$1,-21555
+[ 0-9a-f]+:	7c22005e 	scwpe	\$2,\$0,\$1
+[ 0-9a-f]+:	24010000 	li	\$1,0
+			[0-9a-f]+: R_MIPS_LO16	sync_mem
+[ 0-9a-f]+:	7c20185e 	scwpe	\$0,\$3,\$1
+[ 0-9a-f]+:	3c010123 	lui	\$1,0x123
+[ 0-9a-f]+:	24214567 	addiu	\$1,\$1,17767
+[ 0-9a-f]+:	7c22105e 	scwpe	\$2,\$2,\$1
+[ 0-9a-f]+:	3c010000 	lui	\$1,0x0
+			[0-9a-f]+: R_MIPS_HI16	sync_mem
+[ 0-9a-f]+:	24210000 	addiu	\$1,\$1,0
+			[0-9a-f]+: R_MIPS_LO16	sync_mem
+[ 0-9a-f]+:	7c20005e 	scwpe	\$0,\$0,\$1
 #pass