RISC-V: Support debug and float CSR as the unprivileged ones.

The unprivileged CSR should be controlled by other specific specs rather
than the privileged spec.  For example, the debug CSR should be controlled
by the debug spec, and the float CSR should be controlled by the float
spec.  User may use assembler options to choose what the debug and other
specs they want, or may encode the versions of specs into the architecture
string directly.  Since we haven't decided which one is better, we set the
defined and aborted versions of unprivileged CSR to PRIV_SPEC_CLASS_NONE
in the include/opcode/riscv-opc.h, to tell assembler don't check priv spec
versions for them.  However, these PRIV_SPEC_CLASS_NONE will be changed
to FLOAT_SPEC_CLASS_* and DEBUG_SPEC_CLASS_* in the future.

	gas/
	* config/tc-riscv.c (riscv_csr_class_check): Removed.  Move the
	checking into riscv_csr_address.
	(riscv_csr_version_check): Likewise.
	(riscv_csr_address): New function.  Return the suitable CSR address
	after checking the ISA dependency and versions.  Issue warnings	if
	we find any conflict and -mcsr-check is set.  CSR_CLASS_F and
	CSR_CLASS_DEBUG are unprivileged CSR for now, so don't check the
	priv spec versions for them.
	(reg_csr_lookup_internal): Call riscv_csr_address to find the
	suitable CSR address.

	* testsuite/gas/riscv/priv-reg-fail-fext.d: Remove -mpriv-spec=1.11.
	* testsuite/gas/riscv/priv-reg-fail-read-only-01.d: Likewise.
	* testsuite/gas/riscv/priv-reg-fail-rv32-only.d: Likewise.
	* testsuite/gas/riscv/priv-reg-fail-fext.l:  We don't care the
	priv spec warnings here.  These warnings are added by accident.
	Remove them and only focus on the ISA dependency warnings.
	* testsuite/gas/riscv/priv-reg-fail-rv32-only.l: Likewise.
	* testsuite/gas/riscv/priv-reg-fail-read-only-01.l: Likewise.
	* testsuite/gas/riscv/priv-reg-fail-version-1p9.l: Updated since
	dscratch0 and dscratch1 are regarded as the unprivileged CSR rather
	than the privileged ones.
	* testsuite/gas/riscv/priv-reg-fail-version-1p9p1.l: Likewise.
	* testsuite/gas/riscv/priv-reg-fail-version-1p10.l: Likewise.
	* testsuite/gas/riscv/priv-reg-fail-version-1p11.l: Likewise.
	* testsuite/gas/riscv/priv-reg.s: Likewise.  Add missing debug CSR.
	* testsuite/gas/riscv/priv-reg-version-1p9.d: Likewise.
	* testsuite/gas/riscv/priv-reg-version-1p9p1.d: Likewise.
	* testsuite/gas/riscv/priv-reg-version-1p10.d: Likewise.
	* testsuite/gas/riscv/priv-reg-version-1p11.d: Likewise.
	* testsuite/gas/riscv/csr-dw-regnums.d: Likewise.
	* testsuite/gas/riscv/csr-dw-regnums.s: Likewise.

	include/
	* opcode/riscv-opc.h: Support the unprivileged CSR.  The versions
	of the unprivileged CSR should be PRIV_SPEC_CLASS_NONE for now.
	* opcode/riscv.h (enum riscv_csr_class): Add CSR_CLASS_DEBUG.

	opcodes/
	* riscv-dis.c (print_insn_args, case 'E'): Updated.  Let the
	unprivileged CSR can also be initialized.

3 files changed, 49 insertions, 24 deletions

diff --git a/include/ChangeLog b/include/ChangeLog
index b357064..a9e30ca 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,5 +1,11 @@
 2020-06-30  Nelson Chu  <nelson.chu@sifive.com>
 
+	* opcode/riscv-opc.h: Support the unprivileged CSR.  The versions
+	of the unprivileged CSR should be PRIV_SPEC_CLASS_NONE for now.
+	* opcode/riscv.h (enum riscv_csr_class): Add CSR_CLASS_DEBUG.
+
+2020-06-30  Nelson Chu  <nelson.chu@sifive.com>
+
 	* opcode/riscv-opc.h: Cleanup and remove the unused macros.
 
 2020-06-29  Alan Modra  <amodra@gmail.com>
diff --git a/include/opcode/riscv-opc.h b/include/opcode/riscv-opc.h
index 67bd334..158de32 100644
--- a/include/opcode/riscv-opc.h
+++ b/include/opcode/riscv-opc.h
@@ -595,7 +595,7 @@
 #define MASK_CUSTOM3_RD_RS1  0x707f
 #define MATCH_CUSTOM3_RD_RS1_RS2 0x707b
 #define MASK_CUSTOM3_RD_RS1_RS2  0x707f
-/* CSR addresses (priv spec v1.11).  */
+/* Privileged CSR addresses (v1.11).  */
 #define CSR_USTATUS 0x0
 #define CSR_UIE 0x4
 #define CSR_UTVEC 0x5
@@ -604,9 +604,6 @@
 #define CSR_UCAUSE 0x42
 #define CSR_UTVAL 0x43
 #define CSR_UIP 0x44
-#define CSR_FFLAGS 0x1
-#define CSR_FRM 0x2
-#define CSR_FCSR 0x3
 #define CSR_CYCLE 0xc00
 #define CSR_TIME 0xc01
 #define CSR_INSTRET 0xc02
@@ -811,14 +808,6 @@
 #define CSR_MHPMEVENT29 0x33d
 #define CSR_MHPMEVENT30 0x33e
 #define CSR_MHPMEVENT31 0x33f
-#define CSR_TSELECT 0x7a0
-#define CSR_TDATA1 0x7a1
-#define CSR_TDATA2 0x7a2
-#define CSR_TDATA3 0x7a3
-#define CSR_DCSR 0x7b0
-#define CSR_DPC 0x7b1
-#define CSR_DSCRATCH0 0x7b2
-#define CSR_DSCRATCH1 0x7b3
 #define CSR_HSTATUS 0x200
 #define CSR_HEDELEG 0x202
 #define CSR_HIDELEG 0x203
@@ -837,6 +826,22 @@
 #define CSR_MDBOUND 0x385
 #define CSR_MSCOUNTEREN 0x321
 #define CSR_MHCOUNTEREN 0x322
+/* Unprivileged CSR addresses.  */
+#define CSR_FFLAGS 0x1
+#define CSR_FRM 0x2
+#define CSR_FCSR 0x3
+#define CSR_DCSR 0x7b0
+#define CSR_DPC 0x7b1
+#define CSR_DSCRATCH0 0x7b2
+#define CSR_DSCRATCH1 0x7b3
+#define CSR_TSELECT 0x7a0
+#define CSR_TDATA1 0x7a1
+#define CSR_TDATA2 0x7a2
+#define CSR_TDATA3 0x7a3
+#define CSR_TINFO 0x7a4
+#define CSR_TCONTROL 0x7a5
+#define CSR_MCONTEXT 0x7a8
+#define CSR_SCONTEXT 0x7aa
 #endif /* RISCV_ENCODING_H.  */
 #ifdef DECLARE_INSN
 DECLARE_INSN(slli_rv32, MATCH_SLLI_RV32, MASK_SLLI_RV32)
@@ -1124,6 +1129,7 @@ DECLARE_INSN(custom3_rd_rs1, MATCH_CUSTOM3_RD_RS1, MASK_CUSTOM3_RD_RS1)
 DECLARE_INSN(custom3_rd_rs1_rs2, MATCH_CUSTOM3_RD_RS1_RS2, MASK_CUSTOM3_RD_RS1_RS2)
 #endif /* DECLARE_INSN.  */
 #ifdef DECLARE_CSR
+/* Privileged.  */
 DECLARE_CSR(ustatus, CSR_USTATUS, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
 DECLARE_CSR(uie, CSR_UIE, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
 DECLARE_CSR(utvec, CSR_UTVEC, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
@@ -1132,9 +1138,6 @@ DECLARE_CSR(uepc, CSR_UEPC, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_
 DECLARE_CSR(ucause, CSR_UCAUSE, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
 DECLARE_CSR(utval, CSR_UTVAL, CSR_CLASS_I, PRIV_SPEC_CLASS_1P10, PRIV_SPEC_CLASS_DRAFT)
 DECLARE_CSR(uip, CSR_UIP, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
-DECLARE_CSR(fflags, CSR_FFLAGS, CSR_CLASS_F, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
-DECLARE_CSR(frm, CSR_FRM, CSR_CLASS_F, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
-DECLARE_CSR(fcsr, CSR_FCSR, CSR_CLASS_F, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
 DECLARE_CSR(cycle, CSR_CYCLE, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
 DECLARE_CSR(time, CSR_TIME, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
 DECLARE_CSR(instret, CSR_INSTRET, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
@@ -1339,14 +1342,7 @@ DECLARE_CSR(mhpmevent28, CSR_MHPMEVENT28, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PR
 DECLARE_CSR(mhpmevent29, CSR_MHPMEVENT29, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
 DECLARE_CSR(mhpmevent30, CSR_MHPMEVENT30, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
 DECLARE_CSR(mhpmevent31, CSR_MHPMEVENT31, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
-DECLARE_CSR(tselect, CSR_TSELECT, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
-DECLARE_CSR(tdata1, CSR_TDATA1, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
-DECLARE_CSR(tdata2, CSR_TDATA2, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
-DECLARE_CSR(tdata3, CSR_TDATA3, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
-DECLARE_CSR(dcsr, CSR_DCSR, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
-DECLARE_CSR(dpc, CSR_DPC, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_DRAFT)
-DECLARE_CSR(dscratch0, CSR_DSCRATCH0, CSR_CLASS_I, PRIV_SPEC_CLASS_1P11, PRIV_SPEC_CLASS_DRAFT)
-DECLARE_CSR(dscratch1, CSR_DSCRATCH1, CSR_CLASS_I, PRIV_SPEC_CLASS_1P11, PRIV_SPEC_CLASS_DRAFT)
+/* Dropped.  */
 DECLARE_CSR(hstatus, CSR_HSTATUS, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_1P10)
 DECLARE_CSR(hedeleg, CSR_HEDELEG, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_1P10)
 DECLARE_CSR(hideleg, CSR_HIDELEG, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_1P10)
@@ -1365,6 +1361,22 @@ DECLARE_CSR(mdbase, CSR_MDBASE, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CL
 DECLARE_CSR(mdbound, CSR_MDBOUND, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_1P10)
 DECLARE_CSR(mscounteren, CSR_MSCOUNTEREN, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_1P10)
 DECLARE_CSR(mhcounteren, CSR_MHCOUNTEREN, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_1P10)
+/* Unprivileged.  */
+DECLARE_CSR(fflags, CSR_FFLAGS, CSR_CLASS_F, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(frm, CSR_FRM, CSR_CLASS_F, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(fcsr, CSR_FCSR, CSR_CLASS_F, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(dcsr, CSR_DCSR, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(dpc, CSR_DPC, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(dscratch0, CSR_DSCRATCH0, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(dscratch1, CSR_DSCRATCH1, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(tselect, CSR_TSELECT, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(tdata1, CSR_TDATA1, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(tdata2, CSR_TDATA2, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(tdata3, CSR_TDATA3, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(tinfo, CSR_TINFO, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(tcontrol, CSR_TCONTROL, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(mcontext, CSR_MCONTEXT, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR(scontext, CSR_SCONTEXT, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
 #endif /* DECLARE_CSR.  */
 #ifdef DECLARE_CSR_ALIAS
 DECLARE_CSR_ALIAS(ubadaddr, CSR_UTVAL, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_1P10)
@@ -1372,5 +1384,11 @@ DECLARE_CSR_ALIAS(sbadaddr, CSR_STVAL, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_
 DECLARE_CSR_ALIAS(sptbr, CSR_SATP, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_1P10)
 DECLARE_CSR_ALIAS(mbadaddr, CSR_MTVAL, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_1P10)
 DECLARE_CSR_ALIAS(mucounteren, CSR_MCOUNTINHIBIT, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_1P10)
-DECLARE_CSR_ALIAS(dscratch, CSR_DSCRATCH0, CSR_CLASS_I, PRIV_SPEC_CLASS_1P9P1, PRIV_SPEC_CLASS_1P11)
+DECLARE_CSR_ALIAS(dscratch, CSR_DSCRATCH0, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR_ALIAS(mcontrol, CSR_TDATA1, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR_ALIAS(icount, CSR_TDATA1, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR_ALIAS(itrigger, CSR_TDATA1, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR_ALIAS(etrigger, CSR_TDATA1, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR_ALIAS(textra32, CSR_TDATA3, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
+DECLARE_CSR_ALIAS(textra64, CSR_TDATA3, CSR_CLASS_DEBUG, PRIV_SPEC_CLASS_NONE, PRIV_SPEC_CLASS_NONE)
 #endif /* DECLARE_CSR_ALIAS.  */
diff --git a/include/opcode/riscv.h b/include/opcode/riscv.h
index ba993e7..5cd7515 100644
--- a/include/opcode/riscv.h
+++ b/include/opcode/riscv.h
@@ -373,6 +373,7 @@ enum riscv_csr_class
   CSR_CLASS_I,
   CSR_CLASS_I_32,      /* rv32 only */
   CSR_CLASS_F,         /* f-ext only */
+  CSR_CLASS_DEBUG      /* debug CSR */
 };
 
 /* The current supported privilege spec versions.  */