[Qemu-devel] [PATCHv2 02/13] unicore32-softmmu: Add coprocessor 0(sysctrl) and 1(ocd) instruction support

[Guan Xuetao]

Coprocessor 0 is system control coprocessor, and we need get/set its contents.
Also, all cache/tlb ops shoule be implemented here, but just ignored with no 
harm.

Coprocessor 1 is OCD (on-chip-debugger), which is used for faked console,
so we could output chars to this console without graphic card.

Signed-off-by: Guan Xuetao <address@hidden>
---
 target-unicore32/helper.c    |  185 ++++++++++++++++++++++++++++++++----------
 target-unicore32/helper.h    |   15 ++--
 target-unicore32/translate.c |   75 +++++++++++++++++-
 3 files changed, 223 insertions(+), 52 deletions(-)

diff --git a/target-unicore32/helper.c b/target-unicore32/helper.c
index 17d9b41..f58a5af 100644
--- a/target-unicore32/helper.c
+++ b/target-unicore32/helper.c
@@ -1,12 +1,10 @@
 /*
- * Copyright (C) 2010-2011 GUAN Xue-tao
+ * Copyright (C) 2010-2012 Guan Xuetao
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Contributions from 2012-04-01 on are considered under GPL version 2,
- * or (at your option) any later version.
+ * published by the Free Software Foundation, or any later version.
+ * See the COPYING file in the top-level directory.
  */
 
 #include "cpu.h"
@@ -14,6 +12,14 @@
 #include "helper.h"
 #include "host-utils.h"
 
+#undef DEBUG_UC32
+
+#ifdef DEBUG_UC32
+#define DPRINTF(fmt, ...) printf("%s: " fmt , __func__, ## __VA_ARGS__)
+#else
+#define DPRINTF(fmt, ...) do {} while (0)
+#endif
+
 CPUUniCore32State *uc32_cpu_init(const char *cpu_model)
 {
     UniCore32CPU *cpu;
@@ -45,6 +51,138 @@ uint32_t HELPER(clz)(uint32_t x)
     return clz32(x);
 }
 
+#ifndef CONFIG_USER_ONLY
+void helper_cp0_set(CPUUniCore32State *env, uint32_t val, uint32_t creg,
+        uint32_t cop)
+{
+    /*
+     * movc pp.nn, rn, #imm9
+     *      rn: UCOP_REG_D
+     *      nn: UCOP_REG_N
+     *          1: sys control reg.
+     *          2: page table base reg.
+     *          3: data fault status reg.
+     *          4: insn fault status reg.
+     *          5: cache op. reg.
+     *          6: tlb op. reg.
+     *      imm9: split UCOP_IMM10 with bit5 is 0
+     */
+    switch (creg) {
+    case 1:
+        if (cop != 0) goto unrecognized;
+        env->cp0.c1_sys = val;
+        break;
+    case 2:
+        if (cop != 0) goto unrecognized;
+        env->cp0.c2_base = val;
+        break;
+    case 3:
+        if (cop != 0) goto unrecognized;
+        env->cp0.c3_faultstatus = val;
+        break;
+    case 4:
+        if (cop != 0) goto unrecognized;
+        env->cp0.c4_faultaddr = val;
+        break;
+    case 5:
+        switch(cop) {
+        case 28:
+            DPRINTF("Invalidate Entire I&D cache\n");
+            return;
+        case 20:
+            DPRINTF("Invalidate Entire Icache\n");
+            return;
+        case 12:
+            DPRINTF("Invalidate Entire Dcache\n");
+            return;
+        case 10:
+            DPRINTF("Clean Entire Dcache\n");
+            return;
+        case 14:
+            DPRINTF("Flush Entire Dcache\n");
+            return;
+        case 13:
+            DPRINTF("Invalidate Dcache line\n");
+            return;
+        case 11:
+            DPRINTF("Clean Dcache line\n");
+            return;
+        case 15:
+            DPRINTF("Flush Dcache line\n");
+            return;
+        }
+        break;
+    case 6:
+        if ((cop <= 6) && (cop >=2)) {
+            /* invalid all tlb */
+            tlb_flush(env, 1);
+            return;
+        }
+        break;
+    default:
+        goto unrecognized;
+    }
+    return;
+unrecognized:
+    cpu_abort(env, "Wrong register (%d) or wrong operation (%d) in cp0_set!\n",
+            creg, cop);
+}
+
+uint32_t helper_cp0_get(CPUUniCore32State *env, uint32_t creg, uint32_t cop)
+{
+    /*
+     * movc rd, pp.nn, #imm9
+     *      rd: UCOP_REG_D
+     *      nn: UCOP_REG_N
+     *          0: cpuid and cachetype
+     *          1: sys control reg.
+     *          2: page table base reg.
+     *          3: data fault status reg.
+     *          4: insn fault status reg.
+     *      imm9: split UCOP_IMM10 with bit5 is 0
+     */
+    switch (creg) {
+    case 0:
+        switch (cop) {
+        case 0:
+            return env->cp0.c0_cpuid;
+        case 1:
+            return env->cp0.c0_cachetype;
+        }
+        break;
+    case 1:
+        if (cop == 0) {
+            return env->cp0.c1_sys;
+        }
+        break;
+    case 2:
+        if (cop == 0) {
+            return env->cp0.c2_base;
+        }
+        break;
+    case 3:
+        if (cop == 0) {
+            return env->cp0.c3_faultstatus;
+        }
+        break;
+    case 4:
+        if (cop == 0) {
+            return env->cp0.c4_faultaddr;
+        }
+        break;
+    }
+    cpu_abort(env, "Wrong register (%d) or wrong operation (%d) in cp0_set!\n",
+            creg, cop);
+}
+
+void helper_cp1_putc(target_ulong x)
+{
+    printf("%c", x);
+    fflush(NULL);
+    return;
+}
+#endif
+
 #ifdef CONFIG_USER_ONLY
 void switch_mode(CPUUniCore32State *env, int mode)
 {
@@ -66,43 +204,6 @@ int uc32_cpu_handle_mmu_fault(CPUUniCore32State *env, 
target_ulong address,
 }
 #endif
 
-/* These should probably raise undefined insn exceptions.  */
-void HELPER(set_cp)(CPUUniCore32State *env, uint32_t insn, uint32_t val)
-{
-    int op1 = (insn >> 8) & 0xf;
-    cpu_abort(env, "cp%i insn %08x\n", op1, insn);
-    return;
-}
-
-uint32_t HELPER(get_cp)(CPUUniCore32State *env, uint32_t insn)
-{
-    int op1 = (insn >> 8) & 0xf;
-    cpu_abort(env, "cp%i insn %08x\n", op1, insn);
-    return 0;
-}
-
-void HELPER(set_cp0)(CPUUniCore32State *env, uint32_t insn, uint32_t val)
-{
-    cpu_abort(env, "cp0 insn %08x\n", insn);
-}
-
-uint32_t HELPER(get_cp0)(CPUUniCore32State *env, uint32_t insn)
-{
-    cpu_abort(env, "cp0 insn %08x\n", insn);
-    return 0;
-}
-
-void HELPER(set_r29_banked)(CPUUniCore32State *env, uint32_t mode, uint32_t 
val)
-{
-    cpu_abort(env, "banked r29 write\n");
-}
-
-uint32_t HELPER(get_r29_banked)(CPUUniCore32State *env, uint32_t mode)
-{
-    cpu_abort(env, "banked r29 read\n");
-    return 0;
-}
-
 /* UniCore-F64 support.  We follow the convention used for F64 instrunctions:
    Single precition routines have a "s" suffix, double precision a
    "d" suffix.  */
diff --git a/target-unicore32/helper.h b/target-unicore32/helper.h
index 5a3b8a4..2bbb6af 100644
--- a/target-unicore32/helper.h
+++ b/target-unicore32/helper.h
@@ -8,6 +8,12 @@
  */
 #include "def-helper.h"
 
+#ifndef CONFIG_USER_ONLY
+DEF_HELPER_4(cp0_set, void, env, i32, i32, i32)
+DEF_HELPER_3(cp0_get, i32, env, i32, i32)
+DEF_HELPER_1(cp1_putc, void, i32)
+#endif
+
 DEF_HELPER_1(clz, i32, i32)
 DEF_HELPER_1(clo, i32, i32)
 
@@ -16,12 +22,6 @@ DEF_HELPER_1(exception, void, i32)
 DEF_HELPER_2(asr_write, void, i32, i32)
 DEF_HELPER_0(asr_read, i32)
 
-DEF_HELPER_3(set_cp0, void, env, i32, i32)
-DEF_HELPER_2(get_cp0, i32, env, i32)
-
-DEF_HELPER_3(set_cp, void, env, i32, i32)
-DEF_HELPER_2(get_cp, i32, env, i32)
-
 DEF_HELPER_1(get_user_reg, i32, i32)
 DEF_HELPER_2(set_user_reg, void, i32, i32)
 
@@ -38,9 +38,6 @@ DEF_HELPER_2(shr_cc, i32, i32, i32)
 DEF_HELPER_2(sar_cc, i32, i32, i32)
 DEF_HELPER_2(ror_cc, i32, i32, i32)
 
-DEF_HELPER_2(get_r29_banked, i32, env, i32)
-DEF_HELPER_3(set_r29_banked, void, env, i32, i32)
-
 DEF_HELPER_1(ucf64_get_fpscr, i32, env)
 DEF_HELPER_2(ucf64_set_fpscr, void, env, i32)
 
diff --git a/target-unicore32/translate.c b/target-unicore32/translate.c
index 9793d14..fd51a61 100644
--- a/target-unicore32/translate.c
+++ b/target-unicore32/translate.c
@@ -1,7 +1,7 @@
 /*
  *  UniCore32 translation
  *
- * Copyright (C) 2010-2011 GUAN Xue-tao
+ * Copyright (C) 2010-2012 Guan Xuetao
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -176,6 +176,71 @@ static void store_reg(DisasContext *s, int reg, TCGv var)
                         "Illegal UniCore32 instruction %x at line %d!", \
                         insn, __LINE__)
 
+#ifndef CONFIG_USER_ONLY
+static void disas_cp0_insn(CPUUniCore32State *env, DisasContext *s, uint32_t 
insn)
+{
+    TCGv tmp, tmp2, tmp3;
+    if ((insn & 0xfe000000) == 0xe0000000) {
+        tmp2 = new_tmp();
+        tmp3 = new_tmp();
+        tcg_gen_movi_i32(tmp2, UCOP_REG_N);
+        tcg_gen_movi_i32(tmp3, UCOP_IMM10);
+        if (UCOP_SET_L) {
+            tmp = new_tmp();
+            gen_helper_cp0_get(tmp, cpu_env, tmp2, tmp3);
+            store_reg(s, UCOP_REG_D, tmp);
+        } else {
+            tmp = load_reg(s, UCOP_REG_D);
+            gen_helper_cp0_set(cpu_env, tmp, tmp2, tmp3);
+            dead_tmp(tmp);
+        }
+        dead_tmp(tmp2);
+        dead_tmp(tmp3);
+        return;
+    }
+    ILLEGAL;
+}
+
+static void disas_ocd_insn(CPUUniCore32State *env, DisasContext *s, uint32_t 
insn)
+{
+    TCGv tmp;
+
+    if ((insn & 0xff003fff) == 0xe1000400) {
+        /*
+         * movc rd, pp.nn, #imm9
+         *      rd: UCOP_REG_D
+         *      nn: UCOP_REG_N (must be 0)
+         *      imm9: 0
+         */
+        if (UCOP_REG_N == 0) {
+            tmp = new_tmp();
+            tcg_gen_movi_i32(tmp, 0);
+            store_reg(s, UCOP_REG_D, tmp);
+            return;
+        } else {
+            ILLEGAL;
+        }
+    }
+    if ((insn & 0xff003fff) == 0xe0000401) {
+        /*
+         * movc pp.nn, rn, #imm9
+         *      rn: UCOP_REG_D
+         *      nn: UCOP_REG_N (must be 1)
+         *      imm9: 1
+         */
+        if (UCOP_REG_N == 1) {
+            tmp = load_reg(s, UCOP_REG_D);
+            gen_helper_cp1_putc(tmp);
+            dead_tmp(tmp);
+            return;
+        } else {
+            ILLEGAL;
+        }
+    }
+    ILLEGAL;
+}
+#endif
+
 static inline void gen_set_asr(TCGv var, uint32_t mask)
 {
     TCGv tmp_mask = tcg_const_i32(mask);
@@ -1127,6 +1192,14 @@ static void gen_exception_return(DisasContext *s, TCGv 
pc)
 static void disas_coproc_insn(CPUUniCore32State *env, DisasContext *s, 
uint32_t insn)
 {
     switch (UCOP_CPNUM) {
+#ifndef CONFIG_USER_ONLY
+    case 0:
+        disas_cp0_insn(env, s, insn);
+        break;
+    case 1:
+        disas_ocd_insn(env, s, insn);
+        break;
+#endif
     case 2:
         disas_ucf64_insn(env, s, insn);
         break;
-- 
1.7.0.4