RISC-V: Add 'Smrnmi' extension

This commit adds `mnret' instruction and RNMI-related CSRs from Smrnmi
extension.

bfd/ChangeLog:

	* elfxx-riscv.c (riscv_multi_subset_supports): Add new
	instruction class handling.
	(riscv_multi_subset_supports_ext): Likewise.

gas/ChangeLog:

	* config/tc-riscv.c (enum riscv_csr_class): Add new CSR class.
	(riscv_csr_address): Add new CSR class handling.
	* testsuite/gas/riscv/csr.s: Add new CSR test.
	* testsuite/gas/riscv/csr-dw-regnums.s: Likewise.
	* testsuite/gas/riscv/csr-dw-regnums.d: Likewise.
	* testsuite/gas/riscv/csr-version-1p9p1.d: Likewise.
	* testsuite/gas/riscv/csr-version-1p9p1.l: Likewise.
	* testsuite/gas/riscv/csr-version-1p10.d: Likewise.
	* testsuite/gas/riscv/csr-version-1p10.l: Likewise.
	* testsuite/gas/riscv/csr-version-1p11.d: Likewise.
	* testsuite/gas/riscv/csr-version-1p11.l: Likewise.
	* testsuite/gas/riscv/csr-version-1p12.d: Likewise.
	* testsuite/gas/riscv/csr-version-1p12.l: Likewise.
	* testsuite/gas/riscv/smrnmi.s: New test for mnret instruction.
	* testsuite/gas/riscv/smrnmi.d: Likewise.

include/ChangeLog:

	* opcode/riscv-opc.h (MATCH_MNRET, MASK_MNRET, CSR_MNSCRATCH,
	CSR_MNEPC, CSR_MNCAUSE, CSR_MNSTATUS): New.
	* opcode/riscv.h (enum riscv_insn_class): Add new instruction
	class.

opcodes/ChangeLog:

	* riscv-opc.c (riscv_opcodes): Add 'mnret' instruction.

bfd/elfxx-riscv.c

@@ -1231,6 +1231,7 @@ static struct riscv_supported_ext riscv_supported_std_z_ext[] =
 
 static struct riscv_supported_ext riscv_supported_std_s_ext[] =
 {
+  {"smrnmi",		ISA_SPEC_CLASS_DRAFT,		0, 1, 0 },
   {"smstateen",		ISA_SPEC_CLASS_DRAFT,		1, 0, 0 },
   {"sscofpmf",		ISA_SPEC_CLASS_DRAFT,		1, 0, 0 },
   {"sstc",		ISA_SPEC_CLASS_DRAFT,		1, 0, 0 },
@@ -2391,6 +2392,8 @@ riscv_multi_subset_supports (riscv_parse_subset_t *rps,
 	      || riscv_subset_supports (rps, "zve64d")
 	      || riscv_subset_supports (rps, "zve64f")
 	      || riscv_subset_supports (rps, "zve32f"));
+    case INSN_CLASS_SMRNMI:
+      return riscv_subset_supports (rps, "smrnmi");
     case INSN_CLASS_SVINVAL:
       return riscv_subset_supports (rps, "svinval");
     case INSN_CLASS_H:
@@ -2488,6 +2491,8 @@ riscv_multi_subset_supports_ext (riscv_parse_subset_t *rps,
       return _("v' or `zve64x' or `zve32x");
     case INSN_CLASS_ZVEF:
       return _("v' or `zve64d' or `zve64f' or `zve32f");
+    case INSN_CLASS_SMRNMI:
+      return "smrnmi";
     case INSN_CLASS_SVINVAL:
       return "svinval";
     case INSN_CLASS_ZFH:

gas/config/tc-riscv.c

@@ -68,6 +68,7 @@ enum riscv_csr_class
   CSR_CLASS_DEBUG,	/* debug CSR */
   CSR_CLASS_H,		/* hypervisor */
   CSR_CLASS_H_32,	/* hypervisor, rv32 only */
+  CSR_CLASS_SMRNMI,		/* Smrnmi only */
   CSR_CLASS_SMSTATEEN,		/* Smstateen only */
   CSR_CLASS_SMSTATEEN_AND_H,	/* Smstateen only (with H) */
   CSR_CLASS_SMSTATEEN_32,	/* Smstateen RV32 only */
@@ -937,6 +938,9 @@ riscv_csr_address (const char *csr_name,
     case CSR_CLASS_V:
       extension = "v";
       break;
+    case CSR_CLASS_SMRNMI:
+      extension = "smrnmi";
+      break;
     case CSR_CLASS_SMSTATEEN:
     case CSR_CLASS_SMSTATEEN_AND_H:
     case CSR_CLASS_SMSTATEEN_32:

gas/testsuite/gas/riscv/csr-dw-regnums.d

@@ -313,6 +313,10 @@ Contents of the .* section:
   DW_CFA_offset_extended_sf: r4675 \(vstval\) at cfa\+2316
   DW_CFA_offset_extended_sf: r4676 \(vsip\) at cfa\+2320
   DW_CFA_offset_extended_sf: r4736 \(vsatp\) at cfa\+2560
+  DW_CFA_offset_extended_sf: r5952 \(mnscratch\) at cfa\+7424
+  DW_CFA_offset_extended_sf: r5953 \(mnepc\) at cfa\+7428
+  DW_CFA_offset_extended_sf: r5954 \(mncause\) at cfa\+7432
+  DW_CFA_offset_extended_sf: r5956 \(mnstatus\) at cfa\+7440
   DW_CFA_offset_extended_sf: r4876 \(mstateen0\) at cfa\+3120
   DW_CFA_offset_extended_sf: r4877 \(mstateen1\) at cfa\+3124
   DW_CFA_offset_extended_sf: r4878 \(mstateen2\) at cfa\+3128

gas/testsuite/gas/riscv/csr-dw-regnums.s

@@ -307,6 +307,11 @@ _start:
 	.cfi_offset vstval, 2316
 	.cfi_offset vsip, 2320
 	.cfi_offset vsatp, 2560
+	# Smrnmi extension
+	.cfi_offset mnscratch, 7424
+	.cfi_offset mnepc, 7428
+	.cfi_offset mncause, 7432
+	.cfi_offset mnstatus, 7440
 	# Smstateen extension
 	.cfi_offset mstateen0, 3120
 	.cfi_offset mstateen1, 3124

gas/testsuite/gas/riscv/csr-version-1p10.d

@@ -601,6 +601,14 @@ Disassembly of section .text:
 [ 	]+[0-9a-f]+:[ 	]+24459073[ 	]+csrw[ 	]+vsip,a1
 [ 	]+[0-9a-f]+:[ 	]+28002573[ 	]+csrr[ 	]+a0,vsatp
 [ 	]+[0-9a-f]+:[ 	]+28059073[ 	]+csrw[ 	]+vsatp,a1
+[ 	]+[0-9a-f]+:[ 	]+74002573[ 	]+csrr[ 	]+a0,mnscratch
+[ 	]+[0-9a-f]+:[ 	]+74059073[ 	]+csrw[ 	]+mnscratch,a1
+[ 	]+[0-9a-f]+:[ 	]+74102573[ 	]+csrr[ 	]+a0,mnepc
+[ 	]+[0-9a-f]+:[ 	]+74159073[ 	]+csrw[ 	]+mnepc,a1
+[ 	]+[0-9a-f]+:[ 	]+74202573[ 	]+csrr[ 	]+a0,mncause
+[ 	]+[0-9a-f]+:[ 	]+74259073[ 	]+csrw[ 	]+mncause,a1
+[ 	]+[0-9a-f]+:[ 	]+74402573[ 	]+csrr[ 	]+a0,mnstatus
+[ 	]+[0-9a-f]+:[ 	]+74459073[ 	]+csrw[ 	]+mnstatus,a1
 [ 	]+[0-9a-f]+:[ 	]+30c02573[ 	]+csrr[ 	]+a0,mstateen0
 [ 	]+[0-9a-f]+:[ 	]+30c59073[ 	]+csrw[ 	]+mstateen0,a1
 [ 	]+[0-9a-f]+:[ 	]+30d02573[ 	]+csrr[ 	]+a0,mstateen1

gas/testsuite/gas/riscv/csr-version-1p10.l

@@ -411,6 +411,14 @@
 .*Warning: invalid CSR `vsip', needs `h' extension
 .*Warning: invalid CSR `vsatp', needs `h' extension
 .*Warning: invalid CSR `vsatp', needs `h' extension
+.*Warning: invalid CSR `mnscratch', needs `smrnmi' extension
+.*Warning: invalid CSR `mnscratch', needs `smrnmi' extension
+.*Warning: invalid CSR `mnepc', needs `smrnmi' extension
+.*Warning: invalid CSR `mnepc', needs `smrnmi' extension
+.*Warning: invalid CSR `mncause', needs `smrnmi' extension
+.*Warning: invalid CSR `mncause', needs `smrnmi' extension
+.*Warning: invalid CSR `mnstatus', needs `smrnmi' extension
+.*Warning: invalid CSR `mnstatus', needs `smrnmi' extension
 .*Warning: invalid CSR `mstateen0', needs `smstateen' extension
 .*Warning: invalid CSR `mstateen0', needs `smstateen' extension
 .*Warning: invalid CSR `mstateen1', needs `smstateen' extension

gas/testsuite/gas/riscv/csr-version-1p11.d

@@ -601,6 +601,14 @@ Disassembly of section .text:
 [ 	]+[0-9a-f]+:[ 	]+24459073[ 	]+csrw[ 	]+vsip,a1
 [ 	]+[0-9a-f]+:[ 	]+28002573[ 	]+csrr[ 	]+a0,vsatp
 [ 	]+[0-9a-f]+:[ 	]+28059073[ 	]+csrw[ 	]+vsatp,a1
+[ 	]+[0-9a-f]+:[ 	]+74002573[ 	]+csrr[ 	]+a0,mnscratch
+[ 	]+[0-9a-f]+:[ 	]+74059073[ 	]+csrw[ 	]+mnscratch,a1
+[ 	]+[0-9a-f]+:[ 	]+74102573[ 	]+csrr[ 	]+a0,mnepc
+[ 	]+[0-9a-f]+:[ 	]+74159073[ 	]+csrw[ 	]+mnepc,a1
+[ 	]+[0-9a-f]+:[ 	]+74202573[ 	]+csrr[ 	]+a0,mncause
+[ 	]+[0-9a-f]+:[ 	]+74259073[ 	]+csrw[ 	]+mncause,a1
+[ 	]+[0-9a-f]+:[ 	]+74402573[ 	]+csrr[ 	]+a0,mnstatus
+[ 	]+[0-9a-f]+:[ 	]+74459073[ 	]+csrw[ 	]+mnstatus,a1
 [ 	]+[0-9a-f]+:[ 	]+30c02573[ 	]+csrr[ 	]+a0,mstateen0
 [ 	]+[0-9a-f]+:[ 	]+30c59073[ 	]+csrw[ 	]+mstateen0,a1
 [ 	]+[0-9a-f]+:[ 	]+30d02573[ 	]+csrr[ 	]+a0,mstateen1

gas/testsuite/gas/riscv/csr-version-1p11.l

@@ -409,6 +409,14 @@
 .*Warning: invalid CSR `vsip', needs `h' extension
 .*Warning: invalid CSR `vsatp', needs `h' extension
 .*Warning: invalid CSR `vsatp', needs `h' extension
+.*Warning: invalid CSR `mnscratch', needs `smrnmi' extension
+.*Warning: invalid CSR `mnscratch', needs `smrnmi' extension
+.*Warning: invalid CSR `mnepc', needs `smrnmi' extension
+.*Warning: invalid CSR `mnepc', needs `smrnmi' extension
+.*Warning: invalid CSR `mncause', needs `smrnmi' extension
+.*Warning: invalid CSR `mncause', needs `smrnmi' extension
+.*Warning: invalid CSR `mnstatus', needs `smrnmi' extension
+.*Warning: invalid CSR `mnstatus', needs `smrnmi' extension
 .*Warning: invalid CSR `mstateen0', needs `smstateen' extension
 .*Warning: invalid CSR `mstateen0', needs `smstateen' extension
 .*Warning: invalid CSR `mstateen1', needs `smstateen' extension

gas/testsuite/gas/riscv/csr-version-1p12.d

@@ -601,6 +601,14 @@ Disassembly of section .text:
 [ 	]+[0-9a-f]+:[ 	]+24459073[ 	]+csrw[ 	]+vsip,a1
 [ 	]+[0-9a-f]+:[ 	]+28002573[ 	]+csrr[ 	]+a0,vsatp
 [ 	]+[0-9a-f]+:[ 	]+28059073[ 	]+csrw[ 	]+vsatp,a1
+[ 	]+[0-9a-f]+:[ 	]+74002573[ 	]+csrr[ 	]+a0,mnscratch
+[ 	]+[0-9a-f]+:[ 	]+74059073[ 	]+csrw[ 	]+mnscratch,a1
+[ 	]+[0-9a-f]+:[ 	]+74102573[ 	]+csrr[ 	]+a0,mnepc
+[ 	]+[0-9a-f]+:[ 	]+74159073[ 	]+csrw[ 	]+mnepc,a1
+[ 	]+[0-9a-f]+:[ 	]+74202573[ 	]+csrr[ 	]+a0,mncause
+[ 	]+[0-9a-f]+:[ 	]+74259073[ 	]+csrw[ 	]+mncause,a1
+[ 	]+[0-9a-f]+:[ 	]+74402573[ 	]+csrr[ 	]+a0,mnstatus
+[ 	]+[0-9a-f]+:[ 	]+74459073[ 	]+csrw[ 	]+mnstatus,a1
 [ 	]+[0-9a-f]+:[ 	]+30c02573[ 	]+csrr[ 	]+a0,mstateen0
 [ 	]+[0-9a-f]+:[ 	]+30c59073[ 	]+csrw[ 	]+mstateen0,a1
 [ 	]+[0-9a-f]+:[ 	]+30d02573[ 	]+csrr[ 	]+a0,mstateen1

gas/testsuite/gas/riscv/csr-version-1p12.l

@@ -271,6 +271,14 @@
 .*Warning: invalid CSR `vsip', needs `h' extension
 .*Warning: invalid CSR `vsatp', needs `h' extension
 .*Warning: invalid CSR `vsatp', needs `h' extension
+.*Warning: invalid CSR `mnscratch', needs `smrnmi' extension
+.*Warning: invalid CSR `mnscratch', needs `smrnmi' extension
+.*Warning: invalid CSR `mnepc', needs `smrnmi' extension
+.*Warning: invalid CSR `mnepc', needs `smrnmi' extension
+.*Warning: invalid CSR `mncause', needs `smrnmi' extension
+.*Warning: invalid CSR `mncause', needs `smrnmi' extension
+.*Warning: invalid CSR `mnstatus', needs `smrnmi' extension
+.*Warning: invalid CSR `mnstatus', needs `smrnmi' extension
 .*Warning: invalid CSR `mstateen0', needs `smstateen' extension
 .*Warning: invalid CSR `mstateen0', needs `smstateen' extension
 .*Warning: invalid CSR `mstateen1', needs `smstateen' extension

gas/testsuite/gas/riscv/csr-version-1p9p1.d

@@ -601,6 +601,14 @@ Disassembly of section .text:
 [ 	]+[0-9a-f]+:[ 	]+24459073[ 	]+csrw[ 	]+vsip,a1
 [ 	]+[0-9a-f]+:[ 	]+28002573[ 	]+csrr[ 	]+a0,vsatp
 [ 	]+[0-9a-f]+:[ 	]+28059073[ 	]+csrw[ 	]+vsatp,a1
+[ 	]+[0-9a-f]+:[ 	]+74002573[ 	]+csrr[ 	]+a0,mnscratch
+[ 	]+[0-9a-f]+:[ 	]+74059073[ 	]+csrw[ 	]+mnscratch,a1
+[ 	]+[0-9a-f]+:[ 	]+74102573[ 	]+csrr[ 	]+a0,mnepc
+[ 	]+[0-9a-f]+:[ 	]+74159073[ 	]+csrw[ 	]+mnepc,a1
+[ 	]+[0-9a-f]+:[ 	]+74202573[ 	]+csrr[ 	]+a0,mncause
+[ 	]+[0-9a-f]+:[ 	]+74259073[ 	]+csrw[ 	]+mncause,a1
+[ 	]+[0-9a-f]+:[ 	]+74402573[ 	]+csrr[ 	]+a0,mnstatus
+[ 	]+[0-9a-f]+:[ 	]+74459073[ 	]+csrw[ 	]+mnstatus,a1
 [ 	]+[0-9a-f]+:[ 	]+30c02573[ 	]+csrr[ 	]+a0,mstateen0
 [ 	]+[0-9a-f]+:[ 	]+30c59073[ 	]+csrw[ 	]+mstateen0,a1
 [ 	]+[0-9a-f]+:[ 	]+30d02573[ 	]+csrr[ 	]+a0,mstateen1

gas/testsuite/gas/riscv/csr-version-1p9p1.l

@@ -461,6 +461,14 @@
 .*Warning: invalid CSR `vsip', needs `h' extension
 .*Warning: invalid CSR `vsatp', needs `h' extension
 .*Warning: invalid CSR `vsatp', needs `h' extension
+.*Warning: invalid CSR `mnscratch', needs `smrnmi' extension
+.*Warning: invalid CSR `mnscratch', needs `smrnmi' extension
+.*Warning: invalid CSR `mnepc', needs `smrnmi' extension
+.*Warning: invalid CSR `mnepc', needs `smrnmi' extension
+.*Warning: invalid CSR `mncause', needs `smrnmi' extension
+.*Warning: invalid CSR `mncause', needs `smrnmi' extension
+.*Warning: invalid CSR `mnstatus', needs `smrnmi' extension
+.*Warning: invalid CSR `mnstatus', needs `smrnmi' extension
 .*Warning: invalid CSR `mstateen0', needs `smstateen' extension
 .*Warning: invalid CSR `mstateen0', needs `smstateen' extension
 .*Warning: invalid CSR `mstateen1', needs `smstateen' extension

gas/testsuite/gas/riscv/csr.s

@@ -337,6 +337,12 @@
 	csr vsip
 	csr vsatp
 
+	# Smrnmi extension
+	csr mnscratch
+	csr mnepc
+	csr mncause
+	csr mnstatus
+
 	# Smstateen extension
 	csr mstateen0
 	csr mstateen1

gas/testsuite/gas/riscv/smrnmi.d

@@ -0,0 +1,10 @@
+#as: -march=rv64i_smrnmi
+#source: smrnmi.s
+#objdump: -dr
+
+.*:[ 	]+file format .*
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ 	]+[0-9a-f]+:[ 	]+70200073[ 	]+mnret

gas/testsuite/gas/riscv/smrnmi.s

@@ -0,0 +1,2 @@
+target:
+	mnret

include/opcode/riscv-opc.h

@@ -2055,6 +2055,9 @@
 #define MASK_VDOTUVV  0xfc00707f
 #define MATCH_VFDOTVV  0xe4001057
 #define MASK_VFDOTVV  0xfc00707f
+/* Smrnmi instruction.  */
+#define MATCH_MNRET 0x70200073
+#define MASK_MNRET 0xffffffff
 /* Svinval instruction.  */
 #define MATCH_SINVAL_VMA 0x16000073
 #define MASK_SINVAL_VMA 0xfe007fff
@@ -2432,6 +2435,11 @@
 #define CSR_UIP 0x44
 #define CSR_SEDELEG 0x102
 #define CSR_SIDELEG 0x103
+/* Smrnmi extension */
+#define CSR_MNSCRATCH 0x740
+#define CSR_MNEPC 0x741
+#define CSR_MNCAUSE 0x742
+#define CSR_MNSTATUS 0x744
 /* Smstateen extension */
 #define CSR_MSTATEEN0 0x30c
 #define CSR_MSTATEEN1 0x30d
@@ -2823,6 +2831,7 @@ DECLARE_INSN(c_sd, MATCH_C_SD, MASK_C_SD)
 DECLARE_INSN(c_addiw, MATCH_C_ADDIW, MASK_C_ADDIW)
 DECLARE_INSN(c_ldsp, MATCH_C_LDSP, MASK_C_LDSP)
 DECLARE_INSN(c_sdsp, MATCH_C_SDSP, MASK_C_SDSP)
+DECLARE_INSN(mnret, MATCH_MNRET, MASK_MNRET)
 DECLARE_INSN(sinval_vma, MATCH_SINVAL_VMA, MASK_SINVAL_VMA)
 DECLARE_INSN(sfence_w_inval, MATCH_SFENCE_W_INVAL, MASK_SFENCE_W_INVAL)
 DECLARE_INSN(sfence_inval_ir, MATCH_SFENCE_INVAL_IR, MASK_SFENCE_INVAL_IR)
@@ -3154,6 +3163,11 @@ DECLARE_CSR(vscause, CSR_VSCAUSE, CSR_CLASS_H, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_C
 DECLARE_CSR(vstval, CSR_VSTVAL, CSR_CLASS_H, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
 DECLARE_CSR(vsip, CSR_VSIP, CSR_CLASS_H, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
 DECLARE_CSR(vsatp, CSR_VSATP, CSR_CLASS_H, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+/* Smrnmi extension */
+DECLARE_CSR(mnscratch, CSR_MNSCRATCH, CSR_CLASS_SMRNMI, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(mnepc, CSR_MNEPC, CSR_CLASS_SMRNMI, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(mncause, CSR_MNCAUSE, CSR_CLASS_SMRNMI, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(mnstatus, CSR_MNSTATUS, CSR_CLASS_SMRNMI, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
 /* Smstateen extension */
 DECLARE_CSR(mstateen0, CSR_MSTATEEN0, CSR_CLASS_SMSTATEEN, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
 DECLARE_CSR(mstateen1, CSR_MSTATEEN1, CSR_CLASS_SMSTATEEN, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)

include/opcode/riscv.h

@@ -391,6 +391,7 @@ enum riscv_insn_class
   INSN_CLASS_ZKND_OR_ZKNE,
   INSN_CLASS_V,
   INSN_CLASS_ZVEF,
+  INSN_CLASS_SMRNMI,
   INSN_CLASS_SVINVAL,
   INSN_CLASS_ZICBOM,
   INSN_CLASS_ZICBOP,

opcodes/riscv-opc.c

@@ -1797,6 +1797,9 @@ const struct riscv_opcode riscv_opcodes[] =
 {"vmv4r.v",    0, INSN_CLASS_V, "Vd,Vt", MATCH_VMV4RV, MASK_VMV4RV, match_opcode, 0},
 {"vmv8r.v",    0, INSN_CLASS_V, "Vd,Vt", MATCH_VMV8RV, MASK_VMV8RV, match_opcode, 0},
 
+/* Smrnmi instructions.  */
+{"mnret",           0, INSN_CLASS_SMRNMI, "", MATCH_MNRET, MASK_MNRET, match_opcode, 0 },
+
 /* Svinval instructions.  */
 {"sinval.vma",      0, INSN_CLASS_SVINVAL, "s,t", MATCH_SINVAL_VMA, MASK_SINVAL_VMA, match_opcode, 0 },
 {"sfence.w.inval",  0, INSN_CLASS_SVINVAL, "",    MATCH_SFENCE_W_INVAL, MASK_SFENCE_W_INVAL, match_opcode, 0 },