From e85cb99c5e042ebce78f64213677a48ee7ba0491 Mon Sep 17 00:00:00 2001
From: Andrew Waterman <waterman@eecs.berkeley.edu>
Date: Mon, 9 Dec 2013 15:55:52 -0800
Subject: [PATCH 1/1] New RDCYCLE encoding

---
 riscv/decode.h       |  5 +++--
 riscv/disasm.cc      | 16 ++++++++--------
 riscv/encoding.h     | 44 ++++++++++++++++++++++----------------------
 riscv/insns/csrrc.h  |  2 +-
 riscv/insns/csrrci.h |  2 +-
 riscv/insns/csrrs.h  |  2 +-
 riscv/insns/csrrsi.h |  2 +-
 riscv/insns/csrrw.h  |  2 +-
 riscv/insns/csrrwi.h |  2 +-
 9 files changed, 39 insertions(+), 38 deletions(-)

diff --git a/riscv/decode.h b/riscv/decode.h
index 2229afb..8e506e2 100644
--- a/riscv/decode.h
+++ b/riscv/decode.h
@@ -62,6 +62,7 @@ public:
   uint32_t rs2() { return x(20, 5); }
   uint32_t rs3() { return x(27, 5); }
   uint32_t rm() { return x(12, 3); }
+  reg_t csr() { return x(20, 12); }
 private:
   uint32_t b;
   reg_t x(int lo, int len) { return b << (32-lo-len) >> (32-len); }
@@ -167,8 +168,8 @@ private:
      } while(0)
 
 #define validate_csr(which, write) ({ \
-  int read_priv = ((which) >> 10) & 3; \
-  int write_priv = ((which) >> 8) & 3; \
+  int write_priv = ((which) >> 10) & 3; \
+  int read_priv = ((which) >> 8) & 3; \
   if (read_priv > 0 || (write_priv > 0 && (write))) require_supervisor; \
   (which); })
 
diff --git a/riscv/disasm.cc b/riscv/disasm.cc
index 7d5a8e2..f81d702 100644
--- a/riscv/disasm.cc
+++ b/riscv/disasm.cc
@@ -83,7 +83,7 @@ struct : public arg_t {
 
 struct : public arg_t {
   std::string to_string(insn_t insn) const {
-    switch (insn.i_imm())
+    switch (insn.csr())
     {
       #define DECLARE_CSR(name, num) case num: return #name;
       #include "encoding.h"
@@ -296,13 +296,13 @@ disassembler_t::disassembler_t()
   DEFINE_NOARG(fence_i);
 
   add_insn(new disasm_insn_t("csrr", match_csrrs, mask_csrrs | mask_rs1, {&xrd, &csr}));
-  add_insn(new disasm_insn_t("csrw", match_csrrw, mask_csrrw | mask_rd, {&xrs1, &csr}));
-  add_insn(new disasm_insn_t("csrrw", match_csrrw, mask_csrrw, {&xrd, &xrs1, &csr}));
-  add_insn(new disasm_insn_t("csrrs", match_csrrs, mask_csrrs, {&xrd, &xrs1, &csr}));
-  add_insn(new disasm_insn_t("csrrc", match_csrrc, mask_csrrc, {&xrd, &xrs1, &csr}));
-  add_insn(new disasm_insn_t("csrrwi", match_csrrwi, mask_csrrwi, {&xrd, &zimm5, &csr}));
-  add_insn(new disasm_insn_t("csrrsi", match_csrrsi, mask_csrrsi, {&xrd, &zimm5, &csr}));
-  add_insn(new disasm_insn_t("csrrci", match_csrrci, mask_csrrci, {&xrd, &zimm5, &csr}));
+  add_insn(new disasm_insn_t("csrw", match_csrrw, mask_csrrw | mask_rd, {&csr, &xrs1}));
+  add_insn(new disasm_insn_t("csrrw", match_csrrw, mask_csrrw, {&xrd, &csr, &xrs1}));
+  add_insn(new disasm_insn_t("csrrs", match_csrrs, mask_csrrs, {&xrd, &csr, &xrs1}));
+  add_insn(new disasm_insn_t("csrrc", match_csrrc, mask_csrrc, {&xrd, &csr, &xrs1}));
+  add_insn(new disasm_insn_t("csrrwi", match_csrrwi, mask_csrrwi, {&xrd, &csr, &zimm5}));
+  add_insn(new disasm_insn_t("csrrsi", match_csrrsi, mask_csrrsi, {&xrd, &csr, &zimm5}));
+  add_insn(new disasm_insn_t("csrrci", match_csrrci, mask_csrrci, {&xrd, &csr, &zimm5}));
   DEFINE_NOARG(sret)
 
   DEFINE_FRTYPE(fadd_s);
diff --git a/riscv/encoding.h b/riscv/encoding.h
index 92accfe..48a0108 100644
--- a/riscv/encoding.h
+++ b/riscv/encoding.h
@@ -412,32 +412,32 @@
 #define MASK_FMSUB_D  0x600007f
 #define MATCH_SD 0x3023
 #define MASK_SD  0x707f
-#define CSR_SUP0 0x500
 #define CSR_FFLAGS 0x1
 #define CSR_FRM 0x2
 #define CSR_FCSR 0x3
-#define CSR_CYCLE 0x4
-#define CSR_TIME 0x5
-#define CSR_INSTRET 0x6
+#define CSR_SUP0 0x500
 #define CSR_SUP1 0x501
+#define CSR_EPC 0x502
+#define CSR_BADVADDR 0x503
+#define CSR_PTBR 0x504
+#define CSR_ASID 0x505
+#define CSR_COUNT 0x506
+#define CSR_COMPARE 0x507
 #define CSR_EVEC 0x508
 #define CSR_CAUSE 0x509
 #define CSR_STATUS 0x50a
 #define CSR_HARTID 0x50b
 #define CSR_IMPL 0x50c
-#define CSR_EPC 0x502
+#define CSR_FATC 0x50d
 #define CSR_SEND_IPI 0x50e
 #define CSR_CLEAR_IPI 0x50f
-#define CSR_BADVADDR 0x503
-#define CSR_PTBR 0x504
 #define CSR_STATS 0x51c
 #define CSR_RESET 0x51d
 #define CSR_TOHOST 0x51e
-#define CSR_ASID 0x505
-#define CSR_COUNT 0x506
-#define CSR_COMPARE 0x507
 #define CSR_FROMHOST 0x51f
-#define CSR_FATC 0x50d
+#define CSR_CYCLE 0xc00
+#define CSR_TIME 0xc01
+#define CSR_INSTRET 0xc02
 #endif
 #ifdef DECLARE_INSN
 DECLARE_INSN(fmv_s_x, MATCH_FMV_S_X, MASK_FMV_S_X)
@@ -597,30 +597,30 @@ DECLARE_INSN(fmsub_d, MATCH_FMSUB_D, MASK_FMSUB_D)
 DECLARE_INSN(sd, MATCH_SD, MASK_SD)
 #endif
 #ifdef DECLARE_CSR
-DECLARE_CSR(sup0, CSR_SUP0)
 DECLARE_CSR(fflags, CSR_FFLAGS)
 DECLARE_CSR(frm, CSR_FRM)
 DECLARE_CSR(fcsr, CSR_FCSR)
-DECLARE_CSR(cycle, CSR_CYCLE)
-DECLARE_CSR(time, CSR_TIME)
-DECLARE_CSR(instret, CSR_INSTRET)
+DECLARE_CSR(sup0, CSR_SUP0)
 DECLARE_CSR(sup1, CSR_SUP1)
+DECLARE_CSR(epc, CSR_EPC)
+DECLARE_CSR(badvaddr, CSR_BADVADDR)
+DECLARE_CSR(ptbr, CSR_PTBR)
+DECLARE_CSR(asid, CSR_ASID)
+DECLARE_CSR(count, CSR_COUNT)
+DECLARE_CSR(compare, CSR_COMPARE)
 DECLARE_CSR(evec, CSR_EVEC)
 DECLARE_CSR(cause, CSR_CAUSE)
 DECLARE_CSR(status, CSR_STATUS)
 DECLARE_CSR(hartid, CSR_HARTID)
 DECLARE_CSR(impl, CSR_IMPL)
-DECLARE_CSR(epc, CSR_EPC)
+DECLARE_CSR(fatc, CSR_FATC)
 DECLARE_CSR(send_ipi, CSR_SEND_IPI)
 DECLARE_CSR(clear_ipi, CSR_CLEAR_IPI)
-DECLARE_CSR(badvaddr, CSR_BADVADDR)
-DECLARE_CSR(ptbr, CSR_PTBR)
 DECLARE_CSR(stats, CSR_STATS)
 DECLARE_CSR(reset, CSR_RESET)
 DECLARE_CSR(tohost, CSR_TOHOST)
-DECLARE_CSR(asid, CSR_ASID)
-DECLARE_CSR(count, CSR_COUNT)
-DECLARE_CSR(compare, CSR_COMPARE)
 DECLARE_CSR(fromhost, CSR_FROMHOST)
-DECLARE_CSR(fatc, CSR_FATC)
+DECLARE_CSR(cycle, CSR_CYCLE)
+DECLARE_CSR(time, CSR_TIME)
+DECLARE_CSR(instret, CSR_INSTRET)
 #endif
diff --git a/riscv/insns/csrrc.h b/riscv/insns/csrrc.h
index 636c3f8..8ca7c41 100644
--- a/riscv/insns/csrrc.h
+++ b/riscv/insns/csrrc.h
@@ -1,2 +1,2 @@
-int csr = validate_csr(insn.i_imm(), true);
+int csr = validate_csr(insn.csr(), true);
 WRITE_RD(p->set_pcr(csr, p->get_pcr(csr) & ~RS1));
diff --git a/riscv/insns/csrrci.h b/riscv/insns/csrrci.h
index d671f3b..fc98056 100644
--- a/riscv/insns/csrrci.h
+++ b/riscv/insns/csrrci.h
@@ -1,2 +1,2 @@
-int csr = validate_csr(insn.i_imm(), true);
+int csr = validate_csr(insn.csr(), true);
 WRITE_RD(p->set_pcr(csr, p->get_pcr(csr) & ~(reg_t)insn.rs1()));
diff --git a/riscv/insns/csrrs.h b/riscv/insns/csrrs.h
index fff9f23..60ac6b3 100644
--- a/riscv/insns/csrrs.h
+++ b/riscv/insns/csrrs.h
@@ -1,2 +1,2 @@
-int csr = validate_csr(insn.i_imm(), insn.rs1() != 0);
+int csr = validate_csr(insn.csr(), insn.rs1() != 0);
 WRITE_RD(p->set_pcr(csr, p->get_pcr(csr) | RS1));
diff --git a/riscv/insns/csrrsi.h b/riscv/insns/csrrsi.h
index 99d323b..db6fcd0 100644
--- a/riscv/insns/csrrsi.h
+++ b/riscv/insns/csrrsi.h
@@ -1,2 +1,2 @@
-int csr = validate_csr(insn.i_imm(), true);
+int csr = validate_csr(insn.csr(), true);
 WRITE_RD(p->set_pcr(csr, p->get_pcr(csr) | insn.rs1()));
diff --git a/riscv/insns/csrrw.h b/riscv/insns/csrrw.h
index fbccb77..4b16773 100644
--- a/riscv/insns/csrrw.h
+++ b/riscv/insns/csrrw.h
@@ -1,2 +1,2 @@
-int csr = validate_csr(insn.i_imm(), true);
+int csr = validate_csr(insn.csr(), true);
 WRITE_RD(p->set_pcr(csr, RS1));
diff --git a/riscv/insns/csrrwi.h b/riscv/insns/csrrwi.h
index 840150e..ff20833 100644
--- a/riscv/insns/csrrwi.h
+++ b/riscv/insns/csrrwi.h
@@ -1,2 +1,2 @@
-int csr = validate_csr(insn.i_imm(), true);
+int csr = validate_csr(insn.csr(), true);
 WRITE_RD(p->set_pcr(csr, insn.rs1()));
-- 
2.30.2