lm32: translation routines

This patch adds the main translation routine. All opcodes of the
LatticeMico32 processor are supported and translated to TCG ops.

Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>

3 files changed, 1654 insertions, 0 deletions

diff --git a/target-lm32/helper.c b/target-lm32/helper.c
new file mode 100644
index 0000000000..318e2cf6e0
--- /dev/null
+++ b/target-lm32/helper.c
@@ -0,0 +1,259 @@
+/*
+ *  LatticeMico32 helper routines.
+ *
+ *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+
+#include "config.h"
+#include "cpu.h"
+#include "exec-all.h"
+#include "host-utils.h"
+
+int cpu_lm32_handle_mmu_fault(CPUState *env, target_ulong address, int rw,
+                               int mmu_idx, int is_softmmu)
+{
+    int prot;
+
+    address &= TARGET_PAGE_MASK;
+    prot = PAGE_BITS;
+    if (env->flags & LM32_FLAG_IGNORE_MSB) {
+        tlb_set_page(env, address, address & 0x7fffffff, prot, mmu_idx,
+                TARGET_PAGE_SIZE);
+    } else {
+        tlb_set_page(env, address, address, prot, mmu_idx, TARGET_PAGE_SIZE);
+    }
+
+    return 0;
+}
+
+target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
+{
+    return addr & TARGET_PAGE_MASK;
+}
+
+void do_interrupt(CPUState *env)
+{
+    qemu_log_mask(CPU_LOG_INT,
+            "exception at pc=%x type=%x\n", env->pc, env->exception_index);
+
+    switch (env->exception_index) {
+    case EXCP_INSN_BUS_ERROR:
+    case EXCP_DATA_BUS_ERROR:
+    case EXCP_DIVIDE_BY_ZERO:
+    case EXCP_IRQ:
+    case EXCP_SYSTEMCALL:
+        /* non-debug exceptions */
+        env->regs[R_EA] = env->pc;
+        env->ie |= (env->ie & IE_IE) ? IE_EIE : 0;
+        env->ie &= ~IE_IE;
+        if (env->dc & DC_RE) {
+            env->pc = env->deba + (env->exception_index * 32);
+        } else {
+            env->pc = env->eba + (env->exception_index * 32);
+        }
+        log_cpu_state_mask(CPU_LOG_INT, env, 0);
+        break;
+    case EXCP_BREAKPOINT:
+    case EXCP_WATCHPOINT:
+        /* debug exceptions */
+        env->regs[R_BA] = env->pc;
+        env->ie |= (env->ie & IE_IE) ? IE_BIE : 0;
+        env->ie &= ~IE_IE;
+        if (env->dc & DC_RE) {
+            env->pc = env->deba + (env->exception_index * 32);
+        } else {
+            env->pc = env->eba + (env->exception_index * 32);
+        }
+        log_cpu_state_mask(CPU_LOG_INT, env, 0);
+        break;
+    default:
+        cpu_abort(env, "unhandled exception type=%d\n",
+                  env->exception_index);
+        break;
+    }
+}
+
+typedef struct {
+    const char *name;
+    uint32_t revision;
+    uint8_t num_interrupts;
+    uint8_t num_breakpoints;
+    uint8_t num_watchpoints;
+    uint32_t features;
+} LM32Def;
+
+static const LM32Def lm32_defs[] = {
+    {
+        .name = "lm32-basic",
+        .revision = 3,
+        .num_interrupts = 32,
+        .num_breakpoints = 4,
+        .num_watchpoints = 4,
+        .features = (LM32_FEATURE_SHIFT
+                     | LM32_FEATURE_SIGN_EXTEND
+                     | LM32_FEATURE_CYCLE_COUNT),
+    },
+    {
+        .name = "lm32-standard",
+        .revision = 3,
+        .num_interrupts = 32,
+        .num_breakpoints = 4,
+        .num_watchpoints = 4,
+        .features = (LM32_FEATURE_MULTIPLY
+                     | LM32_FEATURE_DIVIDE
+                     | LM32_FEATURE_SHIFT
+                     | LM32_FEATURE_SIGN_EXTEND
+                     | LM32_FEATURE_I_CACHE
+                     | LM32_FEATURE_CYCLE_COUNT),
+    },
+    {
+        .name = "lm32-full",
+        .revision = 3,
+        .num_interrupts = 32,
+        .num_breakpoints = 4,
+        .num_watchpoints = 4,
+        .features = (LM32_FEATURE_MULTIPLY
+                     | LM32_FEATURE_DIVIDE
+                     | LM32_FEATURE_SHIFT
+                     | LM32_FEATURE_SIGN_EXTEND
+                     | LM32_FEATURE_I_CACHE
+                     | LM32_FEATURE_D_CACHE
+                     | LM32_FEATURE_CYCLE_COUNT),
+    }
+};
+
+void cpu_lm32_list(FILE *f, fprintf_function cpu_fprintf)
+{
+    int i;
+
+    cpu_fprintf(f, "Available CPUs:\n");
+    for (i = 0; i < ARRAY_SIZE(lm32_defs); i++) {
+        cpu_fprintf(f, "  %s\n", lm32_defs[i].name);
+    }
+}
+
+static const LM32Def *cpu_lm32_find_by_name(const char *name)
+{
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(lm32_defs); i++) {
+        if (strcasecmp(name, lm32_defs[i].name) == 0) {
+            return &lm32_defs[i];
+        }
+    }
+
+    return NULL;
+}
+
+static uint32_t cfg_by_def(const LM32Def *def)
+{
+    uint32_t cfg = 0;
+
+    if (def->features & LM32_FEATURE_MULTIPLY) {
+        cfg |= CFG_M;
+    }
+
+    if (def->features & LM32_FEATURE_DIVIDE) {
+        cfg |= CFG_D;
+    }
+
+    if (def->features & LM32_FEATURE_SHIFT) {
+        cfg |= CFG_S;
+    }
+
+    if (def->features & LM32_FEATURE_SIGN_EXTEND) {
+        cfg |= CFG_X;
+    }
+
+    if (def->features & LM32_FEATURE_I_CACHE) {
+        cfg |= CFG_IC;
+    }
+
+    if (def->features & LM32_FEATURE_D_CACHE) {
+        cfg |= CFG_DC;
+    }
+
+    if (def->features & LM32_FEATURE_CYCLE_COUNT) {
+        cfg |= CFG_CC;
+    }
+
+    cfg |= (def->num_interrupts << CFG_INT_SHIFT);
+    cfg |= (def->num_breakpoints << CFG_BP_SHIFT);
+    cfg |= (def->num_watchpoints << CFG_WP_SHIFT);
+    cfg |= (def->revision << CFG_REV_SHIFT);
+
+    return cfg;
+}
+
+CPUState *cpu_lm32_init(const char *cpu_model)
+{
+    CPUState *env;
+    const LM32Def *def;
+    static int tcg_initialized;
+
+    def = cpu_lm32_find_by_name(cpu_model);
+    if (!def) {
+        return NULL;
+    }
+
+    env = qemu_mallocz(sizeof(CPUState));
+
+    env->features = def->features;
+    env->num_bps = def->num_breakpoints;
+    env->num_wps = def->num_watchpoints;
+    env->cfg = cfg_by_def(def);
+    env->flags = 0;
+
+    cpu_exec_init(env);
+    cpu_reset(env);
+
+    if (!tcg_initialized) {
+        tcg_initialized = 1;
+        lm32_translate_init();
+    }
+
+    return env;
+}
+
+/* Some soc ignores the MSB on the address bus. Thus creating a shadow memory
+ * area. As a general rule, 0x00000000-0x7fffffff is cached, whereas
+ * 0x80000000-0xffffffff is not cached and used to access IO devices. */
+void cpu_lm32_set_phys_msb_ignore(CPUState *env, int value)
+{
+    if (value) {
+        env->flags |= LM32_FLAG_IGNORE_MSB;
+    } else {
+        env->flags &= ~LM32_FLAG_IGNORE_MSB;
+    }
+}
+
+void cpu_reset(CPUState *env)
+{
+    if (qemu_loglevel_mask(CPU_LOG_RESET)) {
+        qemu_log("CPU Reset (CPU %d)\n", env->cpu_index);
+        log_cpu_state(env, 0);
+    }
+
+    tlb_flush(env, 1);
+
+    /* reset cpu state */
+    memset(env, 0, offsetof(CPULM32State, breakpoints));
+}
+
diff --git a/target-lm32/lm32-decode.h b/target-lm32/lm32-decode.h
new file mode 100644
index 0000000000..f745b39626
--- /dev/null
+++ b/target-lm32/lm32-decode.h
@@ -0,0 +1,78 @@
+/*
+ *  LatticeMico32 instruction decoding macros.
+ *
+ *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Convenient binary macros */
+#define HEX__(n) 0x##n##LU
+#define B8__(x) (((x&0x0000000FLU) ? 1 : 0) \
+                  + ((x&0x000000F0LU) ? 2 : 0) \
+                  + ((x&0x00000F00LU) ? 4 : 0) \
+                  + ((x&0x0000F000LU) ? 8 : 0) \
+                  + ((x&0x000F0000LU) ? 16 : 0) \
+                  + ((x&0x00F00000LU) ? 32 : 0) \
+                  + ((x&0x0F000000LU) ? 64 : 0) \
+                  + ((x&0xF0000000LU) ? 128 : 0))
+#define B8(d) ((unsigned char)B8__(HEX__(d)))
+
+/* Decode logic, value and mask.  */
+#define DEC_ADD     {B8(00001101), B8(00011111)}
+#define DEC_AND     {B8(00001000), B8(00011111)}
+#define DEC_ANDHI   {B8(00011000), B8(00111111)}
+#define DEC_B       {B8(00110000), B8(00111111)}
+#define DEC_BI      {B8(00111000), B8(00111111)}
+#define DEC_BE      {B8(00010001), B8(00111111)}
+#define DEC_BG      {B8(00010010), B8(00111111)}
+#define DEC_BGE     {B8(00010011), B8(00111111)}
+#define DEC_BGEU    {B8(00010100), B8(00111111)}
+#define DEC_BGU     {B8(00010101), B8(00111111)}
+#define DEC_BNE     {B8(00010111), B8(00111111)}
+#define DEC_CALL    {B8(00110110), B8(00111111)}
+#define DEC_CALLI   {B8(00111110), B8(00111111)}
+#define DEC_CMPE    {B8(00011001), B8(00011111)}
+#define DEC_CMPG    {B8(00011010), B8(00011111)}
+#define DEC_CMPGE   {B8(00011011), B8(00011111)}
+#define DEC_CMPGEU  {B8(00011100), B8(00011111)}
+#define DEC_CMPGU   {B8(00011101), B8(00011111)}
+#define DEC_CMPNE   {B8(00011111), B8(00011111)}
+#define DEC_DIVU    {B8(00100011), B8(00111111)}
+#define DEC_LB      {B8(00000100), B8(00111111)}
+#define DEC_LBU     {B8(00010000), B8(00111111)}
+#define DEC_LH      {B8(00000111), B8(00111111)}
+#define DEC_LHU     {B8(00001011), B8(00111111)}
+#define DEC_LW      {B8(00001010), B8(00111111)}
+#define DEC_MODU    {B8(00110001), B8(00111111)}
+#define DEC_MUL     {B8(00000010), B8(00011111)}
+#define DEC_NOR     {B8(00000001), B8(00011111)}
+#define DEC_OR      {B8(00001110), B8(00011111)}
+#define DEC_ORHI    {B8(00011110), B8(00111111)}
+#define DEC_RAISE   {B8(00101011), B8(00111111)}
+#define DEC_RCSR    {B8(00100100), B8(00111111)}
+#define DEC_SB      {B8(00001100), B8(00111111)}
+#define DEC_SEXTB   {B8(00101100), B8(00111111)}
+#define DEC_SEXTH   {B8(00110111), B8(00111111)}
+#define DEC_SH      {B8(00000011), B8(00111111)}
+#define DEC_SL      {B8(00001111), B8(00011111)}
+#define DEC_SR      {B8(00000101), B8(00011111)}
+#define DEC_SRU     {B8(00000000), B8(00011111)}
+#define DEC_SUB     {B8(00110010), B8(00111111)}
+#define DEC_SW      {B8(00010110), B8(00111111)}
+#define DEC_USER    {B8(00110011), B8(00111111)}
+#define DEC_WCSR    {B8(00110100), B8(00111111)}
+#define DEC_XNOR    {B8(00001001), B8(00011111)}
+#define DEC_XOR     {B8(00000110), B8(00011111)}
+
diff --git a/target-lm32/translate.c b/target-lm32/translate.c
new file mode 100644
index 0000000000..0b0e405fe7
--- /dev/null
+++ b/target-lm32/translate.c
@@ -0,0 +1,1317 @@
+/*
+ *  LatticeMico32 main translation routines.
+ *
+ *  Copyright (c) 2010 Michael Walle <michael@walle.cc>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include <assert.h>
+
+#include "cpu.h"
+#include "exec-all.h"
+#include "disas.h"
+#include "helper.h"
+#include "tcg-op.h"
+#include "lm32-decode.h"
+#include "qemu-common.h"
+
+#include "hw/lm32_pic.h"
+
+#define GEN_HELPER 1
+#include "helper.h"
+
+#define DISAS_LM32 1
+#if DISAS_LM32
+#  define LOG_DIS(...) qemu_log_mask(CPU_LOG_TB_IN_ASM, ## __VA_ARGS__)
+#else
+#  define LOG_DIS(...) do { } while (0)
+#endif
+
+#define EXTRACT_FIELD(src, start, end) \
+            (((src) >> start) & ((1 << (end - start + 1)) - 1))
+
+#define MEM_INDEX 0
+
+static TCGv_ptr cpu_env;
+static TCGv cpu_R[32];
+static TCGv cpu_pc;
+static TCGv cpu_ie;
+static TCGv cpu_icc;
+static TCGv cpu_dcc;
+static TCGv cpu_cc;
+static TCGv cpu_cfg;
+static TCGv cpu_eba;
+static TCGv cpu_dc;
+static TCGv cpu_deba;
+static TCGv cpu_bp[4];
+static TCGv cpu_wp[4];
+
+#include "gen-icount.h"
+
+enum {
+    OP_FMT_RI,
+    OP_FMT_RR,
+    OP_FMT_CR,
+    OP_FMT_I
+};
+
+/* This is the state at translation time.  */
+typedef struct DisasContext {
+    CPUState *env;
+    target_ulong pc;
+
+    /* Decoder.  */
+    int format;
+    uint32_t ir;
+    uint8_t opcode;
+    uint8_t r0, r1, r2, csr;
+    uint16_t imm5;
+    uint16_t imm16;
+    uint32_t imm26;
+
+    unsigned int delayed_branch;
+    unsigned int tb_flags, synced_flags; /* tb dependent flags.  */
+    int is_jmp;
+
+    int nr_nops;
+    struct TranslationBlock *tb;
+    int singlestep_enabled;
+} DisasContext;
+
+static const char *regnames[] = {
+    "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+    "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+    "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
+    "r24", "r25", "r26/gp", "r27/fp", "r28/sp", "r29/ra",
+    "r30/ea", "r31/ba", "bp0", "bp1", "bp2", "bp3", "wp0",
+    "wp1", "wp2", "wp3"
+};
+
+static inline int zero_extend(unsigned int val, int width)
+{
+    return val & ((1 << width) - 1);
+}
+
+static inline int sign_extend(unsigned int val, int width)
+{
+    int sval;
+
+    /* LSL.  */
+    val <<= 32 - width;
+    sval = val;
+    /* ASR.  */
+    sval >>= 32 - width;
+
+    return sval;
+}
+
+static inline void t_gen_raise_exception(DisasContext *dc, uint32_t index)
+{
+    TCGv_i32 tmp = tcg_const_i32(index);
+
+    gen_helper_raise_exception(tmp);
+    tcg_temp_free_i32(tmp);
+}
+
+static void gen_goto_tb(DisasContext *dc, int n, target_ulong dest)
+{
+    TranslationBlock *tb;
+
+    tb = dc->tb;
+    if ((tb->pc & TARGET_PAGE_MASK) == (dest & TARGET_PAGE_MASK) &&
+            likely(!dc->singlestep_enabled)) {
+        tcg_gen_goto_tb(n);
+        tcg_gen_movi_tl(cpu_pc, dest);
+        tcg_gen_exit_tb((long)tb + n);
+    } else {
+        tcg_gen_movi_tl(cpu_pc, dest);
+        if (dc->singlestep_enabled) {
+            t_gen_raise_exception(dc, EXCP_DEBUG);
+        }
+        tcg_gen_exit_tb(0);
+    }
+}
+
+static void dec_add(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        if (dc->r0 == R_R0) {
+            if (dc->r1 == R_R0 && dc->imm16 == 0) {
+                LOG_DIS("nop\n");
+            } else {
+                LOG_DIS("mvi r%d, %d\n", dc->r1, sign_extend(dc->imm16, 16));
+            }
+        } else {
+            LOG_DIS("addi r%d, r%d, %d\n", dc->r1, dc->r0,
+                    sign_extend(dc->imm16, 16));
+        }
+    } else {
+        LOG_DIS("add r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+    }
+
+    if (dc->format == OP_FMT_RI) {
+        tcg_gen_addi_tl(cpu_R[dc->r1], cpu_R[dc->r0],
+                sign_extend(dc->imm16, 16));
+    } else {
+        tcg_gen_add_tl(cpu_R[dc->r2], cpu_R[dc->r0], cpu_R[dc->r1]);
+    }
+}
+
+static void dec_and(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("andi r%d, r%d, %d\n", dc->r1, dc->r0,
+                zero_extend(dc->imm16, 16));
+    } else {
+        LOG_DIS("and r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+    }
+
+    if (dc->format == OP_FMT_RI) {
+        tcg_gen_andi_tl(cpu_R[dc->r1], cpu_R[dc->r0],
+                zero_extend(dc->imm16, 16));
+    } else  {
+        if (dc->r0 == 0 && dc->r1 == 0 && dc->r2 == 0) {
+            tcg_gen_movi_tl(cpu_pc, dc->pc + 4);
+            gen_helper_hlt();
+        } else {
+            tcg_gen_and_tl(cpu_R[dc->r2], cpu_R[dc->r0], cpu_R[dc->r1]);
+        }
+    }
+}
+
+static void dec_andhi(DisasContext *dc)
+{
+    LOG_DIS("andhi r%d, r%d, %d\n", dc->r2, dc->r0, dc->imm16);
+
+    tcg_gen_andi_tl(cpu_R[dc->r1], cpu_R[dc->r0], (dc->imm16 << 16));
+}
+
+static void dec_b(DisasContext *dc)
+{
+    if (dc->r0 == R_RA) {
+        LOG_DIS("ret\n");
+    } else if (dc->r0 == R_EA) {
+        LOG_DIS("eret\n");
+    } else if (dc->r0 == R_BA) {
+        LOG_DIS("bret\n");
+    } else {
+        LOG_DIS("b r%d\n", dc->r0);
+    }
+
+    /* restore IE.IE in case of an eret */
+    if (dc->r0 == R_EA) {
+        TCGv t0 = tcg_temp_new();
+        int l1 = gen_new_label();
+        tcg_gen_andi_tl(t0, cpu_ie, IE_EIE);
+        tcg_gen_ori_tl(cpu_ie, cpu_ie, IE_IE);
+        tcg_gen_brcondi_tl(TCG_COND_EQ, t0, IE_EIE, l1);
+        tcg_gen_andi_tl(cpu_ie, cpu_ie, ~IE_IE);
+        gen_set_label(l1);
+        tcg_temp_free(t0);
+    } else if (dc->r0 == R_BA) {
+        TCGv t0 = tcg_temp_new();
+        int l1 = gen_new_label();
+        tcg_gen_andi_tl(t0, cpu_ie, IE_BIE);
+        tcg_gen_ori_tl(cpu_ie, cpu_ie, IE_IE);
+        tcg_gen_brcondi_tl(TCG_COND_EQ, t0, IE_BIE, l1);
+        tcg_gen_andi_tl(cpu_ie, cpu_ie, ~IE_IE);
+        gen_set_label(l1);
+        tcg_temp_free(t0);
+    }
+    tcg_gen_mov_tl(cpu_pc, cpu_R[dc->r0]);
+
+    dc->is_jmp = DISAS_JUMP;
+}
+
+static void dec_bi(DisasContext *dc)
+{
+    LOG_DIS("bi %d\n", sign_extend(dc->imm26 << 2, 26));
+
+    gen_goto_tb(dc, 0, dc->pc + (sign_extend(dc->imm26 << 2, 26)));
+
+    dc->is_jmp = DISAS_TB_JUMP;
+}
+
+static inline void gen_cond_branch(DisasContext *dc, int cond)
+{
+    int l1;
+
+    l1 = gen_new_label();
+    tcg_gen_brcond_tl(cond, cpu_R[dc->r0], cpu_R[dc->r1], l1);
+    gen_goto_tb(dc, 0, dc->pc + 4);
+    gen_set_label(l1);
+    gen_goto_tb(dc, 1, dc->pc + (sign_extend(dc->imm16 << 2, 16)));
+    dc->is_jmp = DISAS_TB_JUMP;
+}
+
+static void dec_be(DisasContext *dc)
+{
+    LOG_DIS("be r%d, r%d, %d\n", dc->r0, dc->r1,
+            sign_extend(dc->imm16, 16) * 4);
+
+    gen_cond_branch(dc, TCG_COND_EQ);
+}
+
+static void dec_bg(DisasContext *dc)
+{
+    LOG_DIS("bg r%d, r%d, %d\n", dc->r0, dc->r1,
+            sign_extend(dc->imm16, 16 * 4));
+
+    gen_cond_branch(dc, TCG_COND_GT);
+}
+
+static void dec_bge(DisasContext *dc)
+{
+    LOG_DIS("bge r%d, r%d, %d\n", dc->r0, dc->r1,
+            sign_extend(dc->imm16, 16) * 4);
+
+    gen_cond_branch(dc, TCG_COND_GE);
+}
+
+static void dec_bgeu(DisasContext *dc)
+{
+    LOG_DIS("bgeu r%d, r%d, %d\n", dc->r0, dc->r1,
+            sign_extend(dc->imm16, 16) * 4);
+
+    gen_cond_branch(dc, TCG_COND_GEU);
+}
+
+static void dec_bgu(DisasContext *dc)
+{
+    LOG_DIS("bgu r%d, r%d, %d\n", dc->r0, dc->r1,
+            sign_extend(dc->imm16, 16) * 4);
+
+    gen_cond_branch(dc, TCG_COND_GTU);
+}
+
+static void dec_bne(DisasContext *dc)
+{
+    LOG_DIS("bne r%d, r%d, %d\n", dc->r0, dc->r1,
+            sign_extend(dc->imm16, 16) * 4);
+
+    gen_cond_branch(dc, TCG_COND_NE);
+}
+
+static void dec_call(DisasContext *dc)
+{
+    LOG_DIS("call r%d\n", dc->r0);
+
+    tcg_gen_movi_tl(cpu_R[R_RA], dc->pc + 4);
+    tcg_gen_mov_tl(cpu_pc, cpu_R[dc->r0]);
+
+    dc->is_jmp = DISAS_JUMP;
+}
+
+static void dec_calli(DisasContext *dc)
+{
+    LOG_DIS("calli %d\n", sign_extend(dc->imm26, 26) * 4);
+
+    tcg_gen_movi_tl(cpu_R[R_RA], dc->pc + 4);
+    gen_goto_tb(dc, 0, dc->pc + (sign_extend(dc->imm26 << 2, 26)));
+
+    dc->is_jmp = DISAS_TB_JUMP;
+}
+
+static inline void gen_compare(DisasContext *dc, int cond)
+{
+    int rX = (dc->format == OP_FMT_RR) ? dc->r2 : dc->r1;
+    int rY = (dc->format == OP_FMT_RR) ? dc->r0 : dc->r0;
+    int rZ = (dc->format == OP_FMT_RR) ? dc->r1 : -1;
+
+    if (dc->format == OP_FMT_RI) {
+        tcg_gen_setcondi_tl(cond, cpu_R[rX], cpu_R[rY],
+                sign_extend(dc->imm16, 16));
+    } else {
+        tcg_gen_setcond_tl(cond, cpu_R[rX], cpu_R[rY], cpu_R[rZ]);
+    }
+}
+
+static void dec_cmpe(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("cmpei r%d, r%d, %d\n", dc->r0, dc->r1,
+                sign_extend(dc->imm16, 16));
+    } else {
+        LOG_DIS("cmpe r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+    }
+
+    gen_compare(dc, TCG_COND_EQ);
+}
+
+static void dec_cmpg(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("cmpgi r%d, r%d, %d\n", dc->r0, dc->r1,
+                sign_extend(dc->imm16, 16));
+    } else {
+        LOG_DIS("cmpg r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+    }
+
+    gen_compare(dc, TCG_COND_GT);
+}
+
+static void dec_cmpge(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("cmpgei r%d, r%d, %d\n", dc->r0, dc->r1,
+                sign_extend(dc->imm16, 16));
+    } else {
+        LOG_DIS("cmpge r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+    }
+
+    gen_compare(dc, TCG_COND_GE);
+}
+
+static void dec_cmpgeu(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("cmpgeui r%d, r%d, %d\n", dc->r0, dc->r1,
+                sign_extend(dc->imm16, 16));
+    } else {
+        LOG_DIS("cmpgeu r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+    }
+
+    gen_compare(dc, TCG_COND_GEU);
+}
+
+static void dec_cmpgu(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("cmpgui r%d, r%d, %d\n", dc->r0, dc->r1,
+                sign_extend(dc->imm16, 16));
+    } else {
+        LOG_DIS("cmpgu r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+    }
+
+    gen_compare(dc, TCG_COND_GTU);
+}
+
+static void dec_cmpne(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("cmpnei r%d, r%d, %d\n", dc->r0, dc->r1,
+                sign_extend(dc->imm16, 16));
+    } else {
+        LOG_DIS("cmpne r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+    }
+
+    gen_compare(dc, TCG_COND_NE);
+}
+
+static void dec_divu(DisasContext *dc)
+{
+    int l1;
+
+    LOG_DIS("divu r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+
+    if (!(dc->env->features & LM32_FEATURE_DIVIDE)) {
+        cpu_abort(dc->env, "hardware divider is not available\n");
+    }
+
+    l1 = gen_new_label();
+    tcg_gen_brcondi_tl(TCG_COND_NE, cpu_R[dc->r1], 0, l1);
+    tcg_gen_movi_tl(cpu_pc, dc->pc);
+    t_gen_raise_exception(dc, EXCP_DIVIDE_BY_ZERO);
+    gen_set_label(l1);
+    tcg_gen_divu_tl(cpu_R[dc->r2], cpu_R[dc->r0], cpu_R[dc->r1]);
+}
+
+static void dec_lb(DisasContext *dc)
+{
+    TCGv t0;
+
+    LOG_DIS("lb r%d, (r%d+%d)\n", dc->r1, dc->r0, dc->imm16);
+
+    t0 = tcg_temp_new();
+    tcg_gen_addi_tl(t0, cpu_R[dc->r0], sign_extend(dc->imm16, 16));
+    tcg_gen_qemu_ld8s(cpu_R[dc->r1], t0, MEM_INDEX);
+    tcg_temp_free(t0);
+}
+
+static void dec_lbu(DisasContext *dc)
+{
+    TCGv t0;
+
+    LOG_DIS("lbu r%d, (r%d+%d)\n", dc->r1, dc->r0, dc->imm16);
+
+    t0 = tcg_temp_new();
+    tcg_gen_addi_tl(t0, cpu_R[dc->r0], sign_extend(dc->imm16, 16));
+    tcg_gen_qemu_ld8u(cpu_R[dc->r1], t0, MEM_INDEX);
+    tcg_temp_free(t0);
+}
+
+static void dec_lh(DisasContext *dc)
+{
+    TCGv t0;
+
+    LOG_DIS("lh r%d, (r%d+%d)\n", dc->r1, dc->r0, dc->imm16);
+
+    t0 = tcg_temp_new();
+    tcg_gen_addi_tl(t0, cpu_R[dc->r0], sign_extend(dc->imm16, 16));
+    tcg_gen_qemu_ld16s(cpu_R[dc->r1], t0, MEM_INDEX);
+    tcg_temp_free(t0);
+}
+
+static void dec_lhu(DisasContext *dc)
+{
+    TCGv t0;
+
+    LOG_DIS("lhu r%d, (r%d+%d)\n", dc->r1, dc->r0, dc->imm16);
+
+    t0 = tcg_temp_new();
+    tcg_gen_addi_tl(t0, cpu_R[dc->r0], sign_extend(dc->imm16, 16));
+    tcg_gen_qemu_ld16u(cpu_R[dc->r1], t0, MEM_INDEX);
+    tcg_temp_free(t0);
+}
+
+static void dec_lw(DisasContext *dc)
+{
+    TCGv t0;
+
+    LOG_DIS("lw r%d, (r%d+%d)\n", dc->r1, dc->r0, sign_extend(dc->imm16, 16));
+
+    t0 = tcg_temp_new();
+    tcg_gen_addi_tl(t0, cpu_R[dc->r0], sign_extend(dc->imm16, 16));
+    tcg_gen_qemu_ld32s(cpu_R[dc->r1], t0, MEM_INDEX);
+    tcg_temp_free(t0);
+}
+
+static void dec_modu(DisasContext *dc)
+{
+    int l1;
+
+    LOG_DIS("modu r%d, r%d, %d\n", dc->r2, dc->r0, dc->r1);
+
+    if (!(dc->env->features & LM32_FEATURE_DIVIDE)) {
+        cpu_abort(dc->env, "hardware divider is not available\n");
+    }
+
+    l1 = gen_new_label();
+    tcg_gen_brcondi_tl(TCG_COND_NE, cpu_R[dc->r1], 0, l1);
+    tcg_gen_movi_tl(cpu_pc, dc->pc);
+    t_gen_raise_exception(dc, EXCP_DIVIDE_BY_ZERO);
+    gen_set_label(l1);
+    tcg_gen_remu_tl(cpu_R[dc->r2], cpu_R[dc->r0], cpu_R[dc->r1]);
+}
+
+static void dec_mul(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("muli r%d, r%d, %d\n", dc->r0, dc->r1,
+                sign_extend(dc->imm16, 16));
+    } else {
+        LOG_DIS("mul r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+    }
+
+    if (!(dc->env->features & LM32_FEATURE_MULTIPLY)) {
+        cpu_abort(dc->env, "hardware multiplier is not available\n");
+    }
+
+    if (dc->format == OP_FMT_RI) {
+        tcg_gen_muli_tl(cpu_R[dc->r1], cpu_R[dc->r0],
+                sign_extend(dc->imm16, 16));
+    } else {
+        tcg_gen_mul_tl(cpu_R[dc->r2], cpu_R[dc->r0], cpu_R[dc->r1]);
+    }
+}
+
+static void dec_nor(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("nori r%d, r%d, %d\n", dc->r0, dc->r1,
+                zero_extend(dc->imm16, 16));
+    } else {
+        LOG_DIS("nor r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+    }
+
+    if (dc->format == OP_FMT_RI) {
+        TCGv t0 = tcg_temp_new();
+        tcg_gen_movi_tl(t0, zero_extend(dc->imm16, 16));
+        tcg_gen_nor_tl(cpu_R[dc->r1], cpu_R[dc->r0], t0);
+        tcg_temp_free(t0);
+    } else {
+        tcg_gen_nor_tl(cpu_R[dc->r2], cpu_R[dc->r0], cpu_R[dc->r1]);
+    }
+}
+
+static void dec_or(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("ori r%d, r%d, %d\n", dc->r1, dc->r0,
+                zero_extend(dc->imm16, 16));
+    } else {
+        if (dc->r1 == R_R0) {
+            LOG_DIS("mv r%d, r%d\n", dc->r2, dc->r0);
+        } else {
+            LOG_DIS("or r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+        }
+    }
+
+    if (dc->format == OP_FMT_RI) {
+        tcg_gen_ori_tl(cpu_R[dc->r1], cpu_R[dc->r0],
+                zero_extend(dc->imm16, 16));
+    } else {
+        tcg_gen_or_tl(cpu_R[dc->r2], cpu_R[dc->r0], cpu_R[dc->r1]);
+    }
+}
+
+static void dec_orhi(DisasContext *dc)
+{
+    if (dc->r0 == R_R0) {
+        LOG_DIS("mvhi r%d, %d\n", dc->r1, dc->imm16);
+    } else {
+        LOG_DIS("orhi r%d, r%d, %d\n", dc->r1, dc->r0, dc->imm16);
+    }
+
+    tcg_gen_ori_tl(cpu_R[dc->r1], cpu_R[dc->r0], (dc->imm16 << 16));
+}
+
+static void dec_raise(DisasContext *dc)
+{
+    TCGv t0;
+    int l1;
+
+    if (dc->imm5 == 7) {
+        LOG_DIS("scall\n");
+    } else if (dc->imm5 == 2) {
+        LOG_DIS("break\n");
+    } else {
+        cpu_abort(dc->env, "invalid opcode\n");
+    }
+
+    t0 = tcg_temp_new();
+    l1 = gen_new_label();
+
+    /* save IE.IE */
+    tcg_gen_andi_tl(t0, cpu_ie, IE_IE);
+
+    /* IE.IE = 0 */
+    tcg_gen_andi_tl(cpu_ie, cpu_ie, ~IE_IE);
+
+    if (dc->imm5 == 7) {
+        /* IE.EIE = IE.IE */
+        tcg_gen_ori_tl(cpu_ie, cpu_ie, IE_EIE);
+        tcg_gen_brcondi_tl(TCG_COND_EQ, t0, IE_IE, l1);
+        tcg_gen_andi_tl(cpu_ie, cpu_ie, ~IE_EIE);
+        gen_set_label(l1);
+
+        /* gpr[ea] = PC */
+        tcg_gen_movi_tl(cpu_R[R_EA], dc->pc);
+        tcg_temp_free(t0);
+
+        tcg_gen_movi_tl(cpu_pc, dc->pc);
+        t_gen_raise_exception(dc, EXCP_SYSTEMCALL);
+    } else {
+        /* IE.BIE = IE.IE */
+        tcg_gen_ori_tl(cpu_ie, cpu_ie, IE_BIE);
+        tcg_gen_brcondi_tl(TCG_COND_EQ, t0, IE_IE, l1);
+        tcg_gen_andi_tl(cpu_ie, cpu_ie, ~IE_BIE);
+        gen_set_label(l1);
+
+        /* gpr[ba] = PC */
+        tcg_gen_movi_tl(cpu_R[R_BA], dc->pc);
+        tcg_temp_free(t0);
+
+        tcg_gen_movi_tl(cpu_pc, dc->pc);
+        t_gen_raise_exception(dc, EXCP_BREAKPOINT);
+    }
+}
+
+static void dec_rcsr(DisasContext *dc)
+{
+    LOG_DIS("rcsr r%d, %d\n", dc->r2, dc->csr);
+
+    switch (dc->csr) {
+    case CSR_IE:
+        tcg_gen_mov_tl(cpu_R[dc->r2], cpu_ie);
+        break;
+    case CSR_IM:
+        gen_helper_rcsr_im(cpu_R[dc->r2]);
+        break;
+    case CSR_IP:
+        gen_helper_rcsr_ip(cpu_R[dc->r2]);
+        break;
+    case CSR_CC:
+        tcg_gen_mov_tl(cpu_R[dc->r2], cpu_cc);
+        break;
+    case CSR_CFG:
+        tcg_gen_mov_tl(cpu_R[dc->r2], cpu_cfg);
+        break;
+    case CSR_EBA:
+        tcg_gen_mov_tl(cpu_R[dc->r2], cpu_eba);
+        break;
+    case CSR_DC:
+        tcg_gen_mov_tl(cpu_R[dc->r2], cpu_dc);
+        break;
+    case CSR_DEBA:
+        tcg_gen_mov_tl(cpu_R[dc->r2], cpu_deba);
+        break;
+    case CSR_JTX:
+        gen_helper_rcsr_jtx(cpu_R[dc->r2]);
+        break;
+    case CSR_JRX:
+        gen_helper_rcsr_jrx(cpu_R[dc->r2]);
+        break;
+    case CSR_ICC:
+    case CSR_DCC:
+    case CSR_BP0:
+    case CSR_BP1:
+    case CSR_BP2:
+    case CSR_BP3:
+    case CSR_WP0:
+    case CSR_WP1:
+    case CSR_WP2:
+    case CSR_WP3:
+        cpu_abort(dc->env, "invalid read access csr=%x\n", dc->csr);
+        break;
+    default:
+        cpu_abort(dc->env, "read_csr: unknown csr=%x\n", dc->csr);
+        break;
+    }
+}
+
+static void dec_sb(DisasContext *dc)
+{
+    TCGv t0;
+
+    LOG_DIS("sb (r%d+%d), r%d\n", dc->r0, dc->imm16, dc->r1);
+
+    t0 = tcg_temp_new();
+    tcg_gen_addi_tl(t0, cpu_R[dc->r0], sign_extend(dc->imm16, 16));
+    tcg_gen_qemu_st8(cpu_R[dc->r1], t0, MEM_INDEX);
+    tcg_temp_free(t0);
+}
+
+static void dec_sextb(DisasContext *dc)
+{
+    LOG_DIS("sextb r%d, r%d\n", dc->r2, dc->r0);
+
+    if (!(dc->env->features & LM32_FEATURE_SIGN_EXTEND)) {
+        cpu_abort(dc->env, "hardware sign extender is not available\n");
+    }
+
+    tcg_gen_ext8s_tl(cpu_R[dc->r2], cpu_R[dc->r0]);
+}
+
+static void dec_sexth(DisasContext *dc)
+{
+    LOG_DIS("sexth r%d, r%d\n", dc->r2, dc->r0);
+
+    if (!(dc->env->features & LM32_FEATURE_SIGN_EXTEND)) {
+        cpu_abort(dc->env, "hardware sign extender is not available\n");
+    }
+
+    tcg_gen_ext16s_tl(cpu_R[dc->r2], cpu_R[dc->r0]);
+}
+
+static void dec_sh(DisasContext *dc)
+{
+    TCGv t0;
+
+    LOG_DIS("sh (r%d+%d), r%d\n", dc->r0, dc->imm16, dc->r1);
+
+    t0 = tcg_temp_new();
+    tcg_gen_addi_tl(t0, cpu_R[dc->r0], sign_extend(dc->imm16, 16));
+    tcg_gen_qemu_st16(cpu_R[dc->r1], t0, MEM_INDEX);
+    tcg_temp_free(t0);
+}
+
+static void dec_sl(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("sli r%d, r%d, %d\n", dc->r1, dc->r0, dc->imm5);
+    } else {
+        LOG_DIS("sl r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+    }
+
+    if (!(dc->env->features & LM32_FEATURE_SHIFT)) {
+        cpu_abort(dc->env, "hardware shifter is not available\n");
+    }
+
+    if (dc->format == OP_FMT_RI) {
+        tcg_gen_shli_tl(cpu_R[dc->r1], cpu_R[dc->r0], dc->imm5);
+    } else {
+        TCGv t0 = tcg_temp_new();
+        tcg_gen_andi_tl(t0, cpu_R[dc->r1], 0x1f);
+        tcg_gen_shl_tl(cpu_R[dc->r2], cpu_R[dc->r0], t0);
+        tcg_temp_free(t0);
+    }
+}
+
+static void dec_sr(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("sri r%d, r%d, %d\n", dc->r1, dc->r0, dc->imm5);
+    } else {
+        LOG_DIS("sr r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+    }
+
+    if (!(dc->env->features & LM32_FEATURE_SHIFT)) {
+        if (dc->format == OP_FMT_RI) {
+            /* TODO: check r1 == 1 during runtime */
+        } else {
+            if (dc->imm5 != 1) {
+                cpu_abort(dc->env, "hardware shifter is not available\n");
+            }
+        }
+    }
+
+    if (dc->format == OP_FMT_RI) {
+        tcg_gen_sari_tl(cpu_R[dc->r1], cpu_R[dc->r0], dc->imm5);
+    } else {
+        TCGv t0 = tcg_temp_new();
+        tcg_gen_andi_tl(t0, cpu_R[dc->r1], 0x1f);
+        tcg_gen_sar_tl(cpu_R[dc->r2], cpu_R[dc->r0], t0);
+        tcg_temp_free(t0);
+    }
+}
+
+static void dec_sru(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("srui r%d, r%d, %d\n", dc->r1, dc->r0, dc->imm5);
+    } else {
+        LOG_DIS("sru r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+    }
+
+    if (!(dc->env->features & LM32_FEATURE_SHIFT)) {
+        if (dc->format == OP_FMT_RI) {
+            /* TODO: check r1 == 1 during runtime */
+        } else {
+            if (dc->imm5 != 1) {
+                cpu_abort(dc->env, "hardware shifter is not available\n");
+            }
+        }
+    }
+
+    if (dc->format == OP_FMT_RI) {
+        tcg_gen_shri_tl(cpu_R[dc->r1], cpu_R[dc->r0], dc->imm5);
+    } else {
+        TCGv t0 = tcg_temp_new();
+        tcg_gen_andi_tl(t0, cpu_R[dc->r1], 0x1f);
+        tcg_gen_shr_tl(cpu_R[dc->r2], cpu_R[dc->r0], t0);
+        tcg_temp_free(t0);
+    }
+}
+
+static void dec_sub(DisasContext *dc)
+{
+    LOG_DIS("sub r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+
+    tcg_gen_sub_tl(cpu_R[dc->r2], cpu_R[dc->r0], cpu_R[dc->r1]);
+}
+
+static void dec_sw(DisasContext *dc)
+{
+    TCGv t0;
+
+    LOG_DIS("sw (r%d+%d), r%d\n", dc->r0, sign_extend(dc->imm16, 16), dc->r1);
+
+    t0 = tcg_temp_new();
+    tcg_gen_addi_tl(t0, cpu_R[dc->r0], sign_extend(dc->imm16, 16));
+    tcg_gen_qemu_st32(cpu_R[dc->r1], t0, MEM_INDEX);
+    tcg_temp_free(t0);
+}
+
+static void dec_user(DisasContext *dc)
+{
+    LOG_DIS("user");
+
+    cpu_abort(dc->env, "user insn undefined\n");
+}
+
+static void dec_wcsr(DisasContext *dc)
+{
+    int no;
+
+    LOG_DIS("wcsr r%d, %d\n", dc->r1, dc->csr);
+
+    switch (dc->csr) {
+    case CSR_IE:
+        tcg_gen_mov_tl(cpu_ie, cpu_R[dc->r1]);
+        tcg_gen_movi_tl(cpu_pc, dc->pc + 4);
+        dc->is_jmp = DISAS_UPDATE;
+        break;
+    case CSR_IM:
+        /* mark as an io operation because it could cause an interrupt */
+        if (use_icount) {
+            gen_io_start();
+        }
+        gen_helper_wcsr_im(cpu_R[dc->r1]);
+        tcg_gen_movi_tl(cpu_pc, dc->pc + 4);
+        if (use_icount) {
+            gen_io_end();
+        }
+        dc->is_jmp = DISAS_UPDATE;
+        break;
+    case CSR_IP:
+        /* mark as an io operation because it could cause an interrupt */
+        if (use_icount) {
+            gen_io_start();
+        }
+        gen_helper_wcsr_ip(cpu_R[dc->r1]);
+        tcg_gen_movi_tl(cpu_pc, dc->pc + 4);
+        if (use_icount) {
+            gen_io_end();
+        }
+        dc->is_jmp = DISAS_UPDATE;
+        break;
+    case CSR_ICC:
+        /* TODO */
+        break;
+    case CSR_DCC:
+        /* TODO */
+        break;
+    case CSR_EBA:
+        tcg_gen_mov_tl(cpu_eba, cpu_R[dc->r1]);
+        break;
+    case CSR_DEBA:
+        tcg_gen_mov_tl(cpu_deba, cpu_R[dc->r1]);
+        break;
+    case CSR_JTX:
+        gen_helper_wcsr_jtx(cpu_R[dc->r1]);
+        break;
+    case CSR_JRX:
+        gen_helper_wcsr_jrx(cpu_R[dc->r1]);
+        break;
+    case CSR_DC:
+        tcg_gen_mov_tl(cpu_dc, cpu_R[dc->r1]);
+        break;
+    case CSR_BP0:
+    case CSR_BP1:
+    case CSR_BP2:
+    case CSR_BP3:
+        no = dc->csr - CSR_BP0;
+        if (dc->env->num_bps <= no) {
+            cpu_abort(dc->env, "breakpoint #%i is not available\n", no);
+        }
+        tcg_gen_mov_tl(cpu_bp[no], cpu_R[dc->r1]);
+        break;
+    case CSR_WP0:
+    case CSR_WP1:
+    case CSR_WP2:
+    case CSR_WP3:
+        no = dc->csr - CSR_WP0;
+        if (dc->env->num_wps <= no) {
+            cpu_abort(dc->env, "watchpoint #%i is not available\n", no);
+        }
+        tcg_gen_mov_tl(cpu_wp[no], cpu_R[dc->r1]);
+        break;
+    case CSR_CC:
+    case CSR_CFG:
+        cpu_abort(dc->env, "invalid write access csr=%x\n", dc->csr);
+        break;
+    default:
+        cpu_abort(dc->env, "write_csr unknown csr=%x\n", dc->csr);
+        break;
+    }
+}
+
+static void dec_xnor(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("xnori r%d, r%d, %d\n", dc->r0, dc->r1,
+                zero_extend(dc->imm16, 16));
+    } else {
+        if (dc->r1 == R_R0) {
+            LOG_DIS("not r%d, r%d\n", dc->r2, dc->r0);
+        } else {
+            LOG_DIS("xnor r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+        }
+    }
+
+    if (dc->format == OP_FMT_RI) {
+        tcg_gen_xori_tl(cpu_R[dc->r1], cpu_R[dc->r0],
+                zero_extend(dc->imm16, 16));
+        tcg_gen_not_tl(cpu_R[dc->r1], cpu_R[dc->r1]);
+    } else {
+        tcg_gen_eqv_tl(cpu_R[dc->r2], cpu_R[dc->r0], cpu_R[dc->r1]);
+    }
+}
+
+static void dec_xor(DisasContext *dc)
+{
+    if (dc->format == OP_FMT_RI) {
+        LOG_DIS("xori r%d, r%d, %d\n", dc->r0, dc->r1,
+                zero_extend(dc->imm16, 16));
+    } else {
+        LOG_DIS("xor r%d, r%d, r%d\n", dc->r2, dc->r0, dc->r1);
+    }
+
+    if (dc->format == OP_FMT_RI) {
+        tcg_gen_xori_tl(cpu_R[dc->r1], cpu_R[dc->r0],
+                zero_extend(dc->imm16, 16));
+    } else {
+        tcg_gen_xor_tl(cpu_R[dc->r2], cpu_R[dc->r0], cpu_R[dc->r1]);
+    }
+}
+
+typedef struct {
+    struct {
+        uint32_t bits;
+        uint32_t mask;
+    };
+    void (*dec)(DisasContext *dc);
+} DecoderInfo;
+
+static const DecoderInfo decinfo[] = {
+    {DEC_ADD, dec_add},
+    {DEC_AND, dec_and},
+    {DEC_ANDHI, dec_andhi},
+    {DEC_B, dec_b},
+    {DEC_BI, dec_bi},
+    {DEC_BE, dec_be},
+    {DEC_BG, dec_bg},
+    {DEC_BGE, dec_bge},
+    {DEC_BGEU, dec_bgeu},
+    {DEC_BGU, dec_bgu},
+    {DEC_BNE, dec_bne},
+    {DEC_CALL, dec_call},
+    {DEC_CALLI, dec_calli},
+    {DEC_CMPE, dec_cmpe},
+    {DEC_CMPG, dec_cmpg},
+    {DEC_CMPGE, dec_cmpge},
+    {DEC_CMPGEU, dec_cmpgeu},
+    {DEC_CMPGU, dec_cmpgu},
+    {DEC_CMPNE, dec_cmpne},
+    {DEC_DIVU, dec_divu},
+    {DEC_LB, dec_lb},
+    {DEC_LBU, dec_lbu},
+    {DEC_LH, dec_lh},
+    {DEC_LHU, dec_lhu},
+    {DEC_LW, dec_lw},
+    {DEC_MODU, dec_modu},
+    {DEC_MUL, dec_mul},
+    {DEC_NOR, dec_nor},
+    {DEC_OR, dec_or},
+    {DEC_ORHI, dec_orhi},
+    {DEC_RAISE, dec_raise},
+    {DEC_RCSR, dec_rcsr},
+    {DEC_SB, dec_sb},
+    {DEC_SEXTB, dec_sextb},
+    {DEC_SEXTH, dec_sexth},
+    {DEC_SH, dec_sh},
+    {DEC_SL, dec_sl},
+    {DEC_SR, dec_sr},
+    {DEC_SRU, dec_sru},
+    {DEC_SUB, dec_sub},
+    {DEC_SW, dec_sw},
+    {DEC_USER, dec_user},
+    {DEC_WCSR, dec_wcsr},
+    {DEC_XNOR, dec_xnor},
+    {DEC_XOR, dec_xor},
+};
+
+static inline void decode(DisasContext *dc)
+{
+    uint32_t ir;
+    int i;
+
+    if (unlikely(qemu_loglevel_mask(CPU_LOG_TB_OP))) {
+        tcg_gen_debug_insn_start(dc->pc);
+    }
+
+    dc->ir = ir = ldl_code(dc->pc);
+    LOG_DIS("%8.8x\t", dc->ir);
+
+    /* try guessing 'empty' instruction memory, although it may be a valid
+     * instruction sequence (eg. srui r0, r0, 0) */
+    if (dc->ir) {
+        dc->nr_nops = 0;
+    } else {
+        LOG_DIS("nr_nops=%d\t", dc->nr_nops);
+        dc->nr_nops++;
+        if (dc->nr_nops > 4) {
+            cpu_abort(dc->env, "fetching nop sequence\n");
+        }
+    }
+
+    dc->opcode = EXTRACT_FIELD(ir, 26, 31);
+
+    dc->imm5 = EXTRACT_FIELD(ir, 0, 4);
+    dc->imm16 = EXTRACT_FIELD(ir, 0, 15);
+    dc->imm26 = EXTRACT_FIELD(ir, 0, 25);
+
+    dc->csr = EXTRACT_FIELD(ir, 21, 25);
+    dc->r0 = EXTRACT_FIELD(ir, 21, 25);
+    dc->r1 = EXTRACT_FIELD(ir, 16, 20);
+    dc->r2 = EXTRACT_FIELD(ir, 11, 15);
+
+    /* bit 31 seems to indicate insn type.  */
+    if (ir & (1 << 31)) {
+        dc->format = OP_FMT_RR;
+    } else {
+        dc->format = OP_FMT_RI;
+    }
+
+    /* Large switch for all insns.  */
+    for (i = 0; i < ARRAY_SIZE(decinfo); i++) {
+        if ((dc->opcode & decinfo[i].mask) == decinfo[i].bits) {
+            decinfo[i].dec(dc);
+            return;
+        }
+    }
+
+    cpu_abort(dc->env, "unknown opcode 0x%02x\n", dc->opcode);
+}
+
+static void check_breakpoint(CPUState *env, DisasContext *dc)
+{
+    CPUBreakpoint *bp;
+
+    if (unlikely(!QTAILQ_EMPTY(&env->breakpoints))) {
+        QTAILQ_FOREACH(bp, &env->breakpoints, entry) {
+            if (bp->pc == dc->pc) {
+                tcg_gen_movi_tl(cpu_pc, dc->pc);
+                t_gen_raise_exception(dc, EXCP_DEBUG);
+                dc->is_jmp = DISAS_UPDATE;
+             }
+        }
+    }
+}
+
+/* generate intermediate code for basic block 'tb'.  */
+static void gen_intermediate_code_internal(CPUState *env,
+        TranslationBlock *tb, int search_pc)
+{
+    struct DisasContext ctx, *dc = &ctx;
+    uint16_t *gen_opc_end;
+    uint32_t pc_start;
+    int j, lj;
+    uint32_t next_page_start;
+    int num_insns;
+    int max_insns;
+
+    qemu_log_try_set_file(stderr);
+
+    pc_start = tb->pc;
+    dc->env = env;
+    dc->tb = tb;
+
+    gen_opc_end = gen_opc_buf + OPC_MAX_SIZE;
+
+    dc->is_jmp = DISAS_NEXT;
+    dc->pc = pc_start;
+    dc->singlestep_enabled = env->singlestep_enabled;
+    dc->nr_nops = 0;
+
+    if (pc_start & 3) {
+        cpu_abort(env, "LM32: unaligned PC=%x\n", pc_start);
+    }
+
+    if (qemu_loglevel_mask(CPU_LOG_TB_IN_ASM)) {
+        qemu_log("-----------------------------------------\n");
+        log_cpu_state(env, 0);
+    }
+
+    next_page_start = (pc_start & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE;
+    lj = -1;
+    num_insns = 0;
+    max_insns = tb->cflags & CF_COUNT_MASK;
+    if (max_insns == 0) {
+        max_insns = CF_COUNT_MASK;
+    }
+
+    gen_icount_start();
+    do {
+        check_breakpoint(env, dc);
+
+        if (search_pc) {
+            j = gen_opc_ptr - gen_opc_buf;
+            if (lj < j) {
+                lj++;
+                while (lj < j) {
+                    gen_opc_instr_start[lj++] = 0;
+                }
+            }
+            gen_opc_pc[lj] = dc->pc;
+            gen_opc_instr_start[lj] = 1;
+            gen_opc_icount[lj] = num_insns;
+        }
+
+        /* Pretty disas.  */
+        LOG_DIS("%8.8x:\t", dc->pc);
+
+        if (num_insns + 1 == max_insns && (tb->cflags & CF_LAST_IO)) {
+            gen_io_start();
+        }
+
+        decode(dc);
+        dc->pc += 4;
+        num_insns++;
+
+    } while (!dc->is_jmp
+         && gen_opc_ptr < gen_opc_end
+         && !env->singlestep_enabled
+         && !singlestep
+         && (dc->pc < next_page_start)
+         && num_insns < max_insns);
+
+    if (tb->cflags & CF_LAST_IO) {
+        gen_io_end();
+    }
+
+    if (unlikely(env->singlestep_enabled)) {
+        if (dc->is_jmp == DISAS_NEXT) {
+            tcg_gen_movi_tl(cpu_pc, dc->pc);
+        }
+        t_gen_raise_exception(dc, EXCP_DEBUG);
+    } else {
+        switch (dc->is_jmp) {
+        case DISAS_NEXT:
+            gen_goto_tb(dc, 1, dc->pc);
+            break;
+        default:
+        case DISAS_JUMP:
+        case DISAS_UPDATE:
+            /* indicate that the hash table must be used
+               to find the next TB */
+            tcg_gen_exit_tb(0);
+            break;
+        case DISAS_TB_JUMP:
+            /* nothing more to generate */
+            break;
+        }
+    }
+
+    gen_icount_end(tb, num_insns);
+    *gen_opc_ptr = INDEX_op_end;
+    if (search_pc) {
+        j = gen_opc_ptr - gen_opc_buf;
+        lj++;
+        while (lj <= j) {
+            gen_opc_instr_start[lj++] = 0;
+        }
+    } else {
+        tb->size = dc->pc - pc_start;
+        tb->icount = num_insns;
+    }
+
+#ifdef DEBUG_DISAS
+    if (qemu_loglevel_mask(CPU_LOG_TB_IN_ASM)) {
+        qemu_log("\n");
+        log_target_disas(pc_start, dc->pc - pc_start, 0);
+        qemu_log("\nisize=%d osize=%zd\n",
+            dc->pc - pc_start, gen_opc_ptr - gen_opc_buf);
+    }
+#endif
+}
+
+void gen_intermediate_code(CPUState *env, struct TranslationBlock *tb)
+{
+    gen_intermediate_code_internal(env, tb, 0);
+}
+
+void gen_intermediate_code_pc(CPUState *env, struct TranslationBlock *tb)
+{
+    gen_intermediate_code_internal(env, tb, 1);
+}
+
+void cpu_dump_state(CPUState *env, FILE *f, fprintf_function cpu_fprintf,
+                     int flags)
+{
+    int i;
+
+    if (!env || !f) {
+        return;
+    }
+
+    cpu_fprintf(f, "IN: PC=%x %s\n",
+                env->pc, lookup_symbol(env->pc));
+
+    cpu_fprintf(f, "ie=%8.8x (IE=%x EIE=%x BIE=%x) im=%8.8x ip=%8.8x\n",
+             env->ie,
+             (env->ie & IE_IE) ? 1 : 0,
+             (env->ie & IE_EIE) ? 1 : 0,
+             (env->ie & IE_BIE) ? 1 : 0,
+             lm32_pic_get_im(env->pic_state),
+             lm32_pic_get_ip(env->pic_state));
+    cpu_fprintf(f, "eba=%8.8x deba=%8.8x\n",
+             env->eba,
+             env->deba);
+
+    for (i = 0; i < 32; i++) {
+        cpu_fprintf(f, "r%2.2d=%8.8x ", i, env->regs[i]);
+        if ((i + 1) % 4 == 0) {
+            cpu_fprintf(f, "\n");
+        }
+    }
+    cpu_fprintf(f, "\n\n");
+}
+
+void gen_pc_load(CPUState *env, struct TranslationBlock *tb,
+                 unsigned long searched_pc, int pc_pos, void *puc)
+{
+    env->pc = gen_opc_pc[pc_pos];
+}
+
+void lm32_translate_init(void)
+{
+    int i;
+
+    cpu_env = tcg_global_reg_new_ptr(TCG_AREG0, "env");
+
+    for (i = 0; i < ARRAY_SIZE(cpu_R); i++) {
+        cpu_R[i] = tcg_global_mem_new(TCG_AREG0,
+                          offsetof(CPUState, regs[i]),
+                          regnames[i]);
+    }
+
+    for (i = 0; i < ARRAY_SIZE(cpu_bp); i++) {
+        cpu_bp[i] = tcg_global_mem_new(TCG_AREG0,
+                          offsetof(CPUState, bp[i]),
+                          regnames[32+i]);
+    }
+
+    for (i = 0; i < ARRAY_SIZE(cpu_wp); i++) {
+        cpu_wp[i] = tcg_global_mem_new(TCG_AREG0,
+                          offsetof(CPUState, wp[i]),
+                          regnames[36+i]);
+    }
+
+    cpu_pc = tcg_global_mem_new(TCG_AREG0,
+                    offsetof(CPUState, pc),
+                    "pc");
+    cpu_ie = tcg_global_mem_new(TCG_AREG0,
+                    offsetof(CPUState, ie),
+                    "ie");
+    cpu_icc = tcg_global_mem_new(TCG_AREG0,
+                    offsetof(CPUState, icc),
+                    "icc");
+    cpu_dcc = tcg_global_mem_new(TCG_AREG0,
+                    offsetof(CPUState, dcc),
+                    "dcc");
+    cpu_cc = tcg_global_mem_new(TCG_AREG0,
+                    offsetof(CPUState, cc),
+                    "cc");
+    cpu_cfg = tcg_global_mem_new(TCG_AREG0,
+                    offsetof(CPUState, cfg),
+                    "cfg");
+    cpu_eba = tcg_global_mem_new(TCG_AREG0,
+                    offsetof(CPUState, eba),
+                    "eba");
+    cpu_dc = tcg_global_mem_new(TCG_AREG0,
+                    offsetof(CPUState, dc),
+                    "dc");
+    cpu_deba = tcg_global_mem_new(TCG_AREG0,
+                    offsetof(CPUState, deba),
+                    "deba");
+}
+