xref: /qemu/target/openrisc/translate.c (revision a4fd3ec3c7299f6a0f99e89aeb8a52c6538ca27b)

/*
 * OpenRISC translation
 *
 * Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
 *                         Feng Gao <gf91597@gmail.com>
 *
 * 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 "qemu/osdep.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "disas/disas.h"
#include "tcg-op.h"
#include "qemu-common.h"
#include "qemu/log.h"
#include "qemu/bitops.h"
#include "exec/cpu_ldst.h"
#include "exec/translator.h"

#include "exec/helper-proto.h"
#include "exec/helper-gen.h"

#include "trace-tcg.h"
#include "exec/log.h"

#define LOG_DIS(str, ...) \
    qemu_log_mask(CPU_LOG_TB_IN_ASM, "%08x: " str, dc->base.pc_next,    \
                  ## __VA_ARGS__)

/* is_jmp field values */
#define DISAS_JUMP    DISAS_TARGET_0 /* only pc was modified dynamically */
#define DISAS_UPDATE  DISAS_TARGET_1 /* cpu state was modified dynamically */
#define DISAS_TB_JUMP DISAS_TARGET_2 /* only pc was modified statically */

typedef struct DisasContext {
    DisasContextBase base;
    uint32_t mem_idx;
    uint32_t tb_flags;
    uint32_t delayed_branch;
} DisasContext;

static TCGv cpu_sr;
static TCGv cpu_R[32];
static TCGv cpu_R0;
static TCGv cpu_pc;
static TCGv jmp_pc;            /* l.jr/l.jalr temp pc */
static TCGv cpu_ppc;
static TCGv cpu_sr_f;           /* bf/bnf, F flag taken */
static TCGv cpu_sr_cy;          /* carry (unsigned overflow) */
static TCGv cpu_sr_ov;          /* signed overflow */
static TCGv cpu_lock_addr;
static TCGv cpu_lock_value;
static TCGv_i32 fpcsr;
static TCGv_i64 cpu_mac;        /* MACHI:MACLO */
static TCGv_i32 cpu_dflag;
#include "exec/gen-icount.h"

void openrisc_translate_init(void)
{
    static const char * const 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", "r27", "r28", "r29", "r30", "r31",
    };
    int i;

    cpu_sr = tcg_global_mem_new(cpu_env,
                                offsetof(CPUOpenRISCState, sr), "sr");
    cpu_dflag = tcg_global_mem_new_i32(cpu_env,
                                       offsetof(CPUOpenRISCState, dflag),
                                       "dflag");
    cpu_pc = tcg_global_mem_new(cpu_env,
                                offsetof(CPUOpenRISCState, pc), "pc");
    cpu_ppc = tcg_global_mem_new(cpu_env,
                                 offsetof(CPUOpenRISCState, ppc), "ppc");
    jmp_pc = tcg_global_mem_new(cpu_env,
                                offsetof(CPUOpenRISCState, jmp_pc), "jmp_pc");
    cpu_sr_f = tcg_global_mem_new(cpu_env,
                                  offsetof(CPUOpenRISCState, sr_f), "sr_f");
    cpu_sr_cy = tcg_global_mem_new(cpu_env,
                                   offsetof(CPUOpenRISCState, sr_cy), "sr_cy");
    cpu_sr_ov = tcg_global_mem_new(cpu_env,
                                   offsetof(CPUOpenRISCState, sr_ov), "sr_ov");
    cpu_lock_addr = tcg_global_mem_new(cpu_env,
                                       offsetof(CPUOpenRISCState, lock_addr),
                                       "lock_addr");
    cpu_lock_value = tcg_global_mem_new(cpu_env,
                                        offsetof(CPUOpenRISCState, lock_value),
                                        "lock_value");
    fpcsr = tcg_global_mem_new_i32(cpu_env,
                                   offsetof(CPUOpenRISCState, fpcsr),
                                   "fpcsr");
    cpu_mac = tcg_global_mem_new_i64(cpu_env,
                                     offsetof(CPUOpenRISCState, mac),
                                     "mac");
    for (i = 0; i < 32; i++) {
        cpu_R[i] = tcg_global_mem_new(cpu_env,
                                      offsetof(CPUOpenRISCState,
                                               shadow_gpr[0][i]),
                                      regnames[i]);
    }
    cpu_R0 = cpu_R[0];
}

static void gen_exception(DisasContext *dc, unsigned int excp)
{
    TCGv_i32 tmp = tcg_const_i32(excp);
    gen_helper_exception(cpu_env, tmp);
    tcg_temp_free_i32(tmp);
}

static void gen_illegal_exception(DisasContext *dc)
{
    tcg_gen_movi_tl(cpu_pc, dc->base.pc_next);
    gen_exception(dc, EXCP_ILLEGAL);
    dc->base.is_jmp = DISAS_NORETURN;
}

/* not used yet, open it when we need or64.  */
/*#ifdef TARGET_OPENRISC64
static void check_ob64s(DisasContext *dc)
{
    if (!(dc->flags & CPUCFGR_OB64S)) {
        gen_illegal_exception(dc);
    }
}

static void check_of64s(DisasContext *dc)
{
    if (!(dc->flags & CPUCFGR_OF64S)) {
        gen_illegal_exception(dc);
    }
}

static void check_ov64s(DisasContext *dc)
{
    if (!(dc->flags & CPUCFGR_OV64S)) {
        gen_illegal_exception(dc);
    }
}
#endif*/

/* We're about to write to REG.  On the off-chance that the user is
   writing to R0, re-instate the architectural register.  */
#define check_r0_write(reg)             \
    do {                                \
        if (unlikely(reg == 0)) {       \
            cpu_R[0] = cpu_R0;          \
        }                               \
    } while (0)

static inline bool use_goto_tb(DisasContext *dc, target_ulong dest)
{
    if (unlikely(dc->base.singlestep_enabled)) {
        return false;
    }

#ifndef CONFIG_USER_ONLY
    return (dc->base.tb->pc & TARGET_PAGE_MASK) == (dest & TARGET_PAGE_MASK);
#else
    return true;
#endif
}

static void gen_goto_tb(DisasContext *dc, int n, target_ulong dest)
{
    if (use_goto_tb(dc, dest)) {
        tcg_gen_movi_tl(cpu_pc, dest);
        tcg_gen_goto_tb(n);
        tcg_gen_exit_tb((uintptr_t)dc->base.tb + n);
    } else {
        tcg_gen_movi_tl(cpu_pc, dest);
        if (dc->base.singlestep_enabled) {
            gen_exception(dc, EXCP_DEBUG);
        }
        tcg_gen_exit_tb(0);
    }
}

static void gen_jump(DisasContext *dc, int32_t n26, uint32_t reg, uint32_t op0)
{
    target_ulong tmp_pc = dc->base.pc_next + n26 * 4;

    switch (op0) {
    case 0x00:     /* l.j */
        tcg_gen_movi_tl(jmp_pc, tmp_pc);
        break;
    case 0x01:     /* l.jal */
        tcg_gen_movi_tl(cpu_R[9], dc->base.pc_next + 8);
        /* Optimize jal being used to load the PC for PIC.  */
        if (tmp_pc == dc->base.pc_next + 8) {
            return;
        }
        tcg_gen_movi_tl(jmp_pc, tmp_pc);
        break;
    case 0x03:     /* l.bnf */
    case 0x04:     /* l.bf  */
        {
            TCGv t_next = tcg_const_tl(dc->base.pc_next + 8);
            TCGv t_true = tcg_const_tl(tmp_pc);
            TCGv t_zero = tcg_const_tl(0);

            tcg_gen_movcond_tl(op0 == 0x03 ? TCG_COND_EQ : TCG_COND_NE,
                               jmp_pc, cpu_sr_f, t_zero, t_true, t_next);

            tcg_temp_free(t_next);
            tcg_temp_free(t_true);
            tcg_temp_free(t_zero);
        }
        break;
    case 0x11:     /* l.jr */
        tcg_gen_mov_tl(jmp_pc, cpu_R[reg]);
        break;
    case 0x12:     /* l.jalr */
        tcg_gen_movi_tl(cpu_R[9], (dc->base.pc_next + 8));
        tcg_gen_mov_tl(jmp_pc, cpu_R[reg]);
        break;
    default:
        gen_illegal_exception(dc);
        break;
    }

    dc->delayed_branch = 2;
}

static void gen_ove_cy(DisasContext *dc)
{
    if (dc->tb_flags & SR_OVE) {
        gen_helper_ove_cy(cpu_env);
    }
}

static void gen_ove_ov(DisasContext *dc)
{
    if (dc->tb_flags & SR_OVE) {
        gen_helper_ove_ov(cpu_env);
    }
}

static void gen_ove_cyov(DisasContext *dc)
{
    if (dc->tb_flags & SR_OVE) {
        gen_helper_ove_cyov(cpu_env);
    }
}

static void gen_add(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
{
    TCGv t0 = tcg_const_tl(0);
    TCGv res = tcg_temp_new();

    tcg_gen_add2_tl(res, cpu_sr_cy, srca, t0, srcb, t0);
    tcg_gen_xor_tl(cpu_sr_ov, srca, srcb);
    tcg_gen_xor_tl(t0, res, srcb);
    tcg_gen_andc_tl(cpu_sr_ov, t0, cpu_sr_ov);
    tcg_temp_free(t0);

    tcg_gen_mov_tl(dest, res);
    tcg_temp_free(res);

    gen_ove_cyov(dc);
}

static void gen_addc(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
{
    TCGv t0 = tcg_const_tl(0);
    TCGv res = tcg_temp_new();

    tcg_gen_add2_tl(res, cpu_sr_cy, srca, t0, cpu_sr_cy, t0);
    tcg_gen_add2_tl(res, cpu_sr_cy, res, cpu_sr_cy, srcb, t0);
    tcg_gen_xor_tl(cpu_sr_ov, srca, srcb);
    tcg_gen_xor_tl(t0, res, srcb);
    tcg_gen_andc_tl(cpu_sr_ov, t0, cpu_sr_ov);
    tcg_temp_free(t0);

    tcg_gen_mov_tl(dest, res);
    tcg_temp_free(res);

    gen_ove_cyov(dc);
}

static void gen_sub(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
{
    TCGv res = tcg_temp_new();

    tcg_gen_sub_tl(res, srca, srcb);
    tcg_gen_xor_tl(cpu_sr_cy, srca, srcb);
    tcg_gen_xor_tl(cpu_sr_ov, res, srcb);
    tcg_gen_and_tl(cpu_sr_ov, cpu_sr_ov, cpu_sr_cy);
    tcg_gen_setcond_tl(TCG_COND_LTU, cpu_sr_cy, srca, srcb);

    tcg_gen_mov_tl(dest, res);
    tcg_temp_free(res);

    gen_ove_cyov(dc);
}

static void gen_mul(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
{
    TCGv t0 = tcg_temp_new();

    tcg_gen_muls2_tl(dest, cpu_sr_ov, srca, srcb);
    tcg_gen_sari_tl(t0, dest, TARGET_LONG_BITS - 1);
    tcg_gen_setcond_tl(TCG_COND_NE, cpu_sr_ov, cpu_sr_ov, t0);
    tcg_temp_free(t0);

    tcg_gen_neg_tl(cpu_sr_ov, cpu_sr_ov);
    gen_ove_ov(dc);
}

static void gen_mulu(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
{
    tcg_gen_muls2_tl(dest, cpu_sr_cy, srca, srcb);
    tcg_gen_setcondi_tl(TCG_COND_NE, cpu_sr_cy, cpu_sr_cy, 0);

    gen_ove_cy(dc);
}

static void gen_div(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
{
    TCGv t0 = tcg_temp_new();

    tcg_gen_setcondi_tl(TCG_COND_EQ, cpu_sr_ov, srcb, 0);
    /* The result of divide-by-zero is undefined.
       Supress the host-side exception by dividing by 1.  */
    tcg_gen_or_tl(t0, srcb, cpu_sr_ov);
    tcg_gen_div_tl(dest, srca, t0);
    tcg_temp_free(t0);

    tcg_gen_neg_tl(cpu_sr_ov, cpu_sr_ov);
    gen_ove_ov(dc);
}

static void gen_divu(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
{
    TCGv t0 = tcg_temp_new();

    tcg_gen_setcondi_tl(TCG_COND_EQ, cpu_sr_cy, srcb, 0);
    /* The result of divide-by-zero is undefined.
       Supress the host-side exception by dividing by 1.  */
    tcg_gen_or_tl(t0, srcb, cpu_sr_cy);
    tcg_gen_divu_tl(dest, srca, t0);
    tcg_temp_free(t0);

    gen_ove_cy(dc);
}

static void gen_muld(DisasContext *dc, TCGv srca, TCGv srcb)
{
    TCGv_i64 t1 = tcg_temp_new_i64();
    TCGv_i64 t2 = tcg_temp_new_i64();

    tcg_gen_ext_tl_i64(t1, srca);
    tcg_gen_ext_tl_i64(t2, srcb);
    if (TARGET_LONG_BITS == 32) {
        tcg_gen_mul_i64(cpu_mac, t1, t2);
        tcg_gen_movi_tl(cpu_sr_ov, 0);
    } else {
        TCGv_i64 high = tcg_temp_new_i64();

        tcg_gen_muls2_i64(cpu_mac, high, t1, t2);
        tcg_gen_sari_i64(t1, cpu_mac, 63);
        tcg_gen_setcond_i64(TCG_COND_NE, t1, t1, high);
        tcg_temp_free_i64(high);
        tcg_gen_trunc_i64_tl(cpu_sr_ov, t1);
        tcg_gen_neg_tl(cpu_sr_ov, cpu_sr_ov);

        gen_ove_ov(dc);
    }
    tcg_temp_free_i64(t1);
    tcg_temp_free_i64(t2);
}

static void gen_muldu(DisasContext *dc, TCGv srca, TCGv srcb)
{
    TCGv_i64 t1 = tcg_temp_new_i64();
    TCGv_i64 t2 = tcg_temp_new_i64();

    tcg_gen_extu_tl_i64(t1, srca);
    tcg_gen_extu_tl_i64(t2, srcb);
    if (TARGET_LONG_BITS == 32) {
        tcg_gen_mul_i64(cpu_mac, t1, t2);
        tcg_gen_movi_tl(cpu_sr_cy, 0);
    } else {
        TCGv_i64 high = tcg_temp_new_i64();

        tcg_gen_mulu2_i64(cpu_mac, high, t1, t2);
        tcg_gen_setcondi_i64(TCG_COND_NE, high, high, 0);
        tcg_gen_trunc_i64_tl(cpu_sr_cy, high);
        tcg_temp_free_i64(high);

        gen_ove_cy(dc);
    }
    tcg_temp_free_i64(t1);
    tcg_temp_free_i64(t2);
}

static void gen_mac(DisasContext *dc, TCGv srca, TCGv srcb)
{
    TCGv_i64 t1 = tcg_temp_new_i64();
    TCGv_i64 t2 = tcg_temp_new_i64();

    tcg_gen_ext_tl_i64(t1, srca);
    tcg_gen_ext_tl_i64(t2, srcb);
    tcg_gen_mul_i64(t1, t1, t2);

    /* Note that overflow is only computed during addition stage.  */
    tcg_gen_xor_i64(t2, cpu_mac, t1);
    tcg_gen_add_i64(cpu_mac, cpu_mac, t1);
    tcg_gen_xor_i64(t1, t1, cpu_mac);
    tcg_gen_andc_i64(t1, t1, t2);
    tcg_temp_free_i64(t2);

#if TARGET_LONG_BITS == 32
    tcg_gen_extrh_i64_i32(cpu_sr_ov, t1);
#else
    tcg_gen_mov_i64(cpu_sr_ov, t1);
#endif
    tcg_temp_free_i64(t1);

    gen_ove_ov(dc);
}

static void gen_macu(DisasContext *dc, TCGv srca, TCGv srcb)
{
    TCGv_i64 t1 = tcg_temp_new_i64();
    TCGv_i64 t2 = tcg_temp_new_i64();

    tcg_gen_extu_tl_i64(t1, srca);
    tcg_gen_extu_tl_i64(t2, srcb);
    tcg_gen_mul_i64(t1, t1, t2);
    tcg_temp_free_i64(t2);

    /* Note that overflow is only computed during addition stage.  */
    tcg_gen_add_i64(cpu_mac, cpu_mac, t1);
    tcg_gen_setcond_i64(TCG_COND_LTU, t1, cpu_mac, t1);
    tcg_gen_trunc_i64_tl(cpu_sr_cy, t1);
    tcg_temp_free_i64(t1);

    gen_ove_cy(dc);
}

static void gen_msb(DisasContext *dc, TCGv srca, TCGv srcb)
{
    TCGv_i64 t1 = tcg_temp_new_i64();
    TCGv_i64 t2 = tcg_temp_new_i64();

    tcg_gen_ext_tl_i64(t1, srca);
    tcg_gen_ext_tl_i64(t2, srcb);
    tcg_gen_mul_i64(t1, t1, t2);

    /* Note that overflow is only computed during subtraction stage.  */
    tcg_gen_xor_i64(t2, cpu_mac, t1);
    tcg_gen_sub_i64(cpu_mac, cpu_mac, t1);
    tcg_gen_xor_i64(t1, t1, cpu_mac);
    tcg_gen_and_i64(t1, t1, t2);
    tcg_temp_free_i64(t2);

#if TARGET_LONG_BITS == 32
    tcg_gen_extrh_i64_i32(cpu_sr_ov, t1);
#else
    tcg_gen_mov_i64(cpu_sr_ov, t1);
#endif
    tcg_temp_free_i64(t1);

    gen_ove_ov(dc);
}

static void gen_msbu(DisasContext *dc, TCGv srca, TCGv srcb)
{
    TCGv_i64 t1 = tcg_temp_new_i64();
    TCGv_i64 t2 = tcg_temp_new_i64();

    tcg_gen_extu_tl_i64(t1, srca);
    tcg_gen_extu_tl_i64(t2, srcb);
    tcg_gen_mul_i64(t1, t1, t2);

    /* Note that overflow is only computed during subtraction stage.  */
    tcg_gen_setcond_i64(TCG_COND_LTU, t2, cpu_mac, t1);
    tcg_gen_sub_i64(cpu_mac, cpu_mac, t1);
    tcg_gen_trunc_i64_tl(cpu_sr_cy, t2);
    tcg_temp_free_i64(t2);
    tcg_temp_free_i64(t1);

    gen_ove_cy(dc);
}

static void gen_lwa(DisasContext *dc, TCGv rd, TCGv ra, int32_t ofs)
{
    TCGv ea = tcg_temp_new();

    tcg_gen_addi_tl(ea, ra, ofs);
    tcg_gen_qemu_ld_tl(rd, ea, dc->mem_idx, MO_TEUL);
    tcg_gen_mov_tl(cpu_lock_addr, ea);
    tcg_gen_mov_tl(cpu_lock_value, rd);
    tcg_temp_free(ea);
}

static void gen_swa(DisasContext *dc, int b, TCGv ra, int32_t ofs)
{
    TCGv ea, val;
    TCGLabel *lab_fail, *lab_done;

    ea = tcg_temp_new();
    tcg_gen_addi_tl(ea, ra, ofs);

    /* For TB_FLAGS_R0_0, the branch below invalidates the temporary assigned
       to cpu_R[0].  Since l.swa is quite often immediately followed by a
       branch, don't bother reallocating; finish the TB using the "real" R0.
       This also takes care of RB input across the branch.  */
    cpu_R[0] = cpu_R0;

    lab_fail = gen_new_label();
    lab_done = gen_new_label();
    tcg_gen_brcond_tl(TCG_COND_NE, ea, cpu_lock_addr, lab_fail);
    tcg_temp_free(ea);

    val = tcg_temp_new();
    tcg_gen_atomic_cmpxchg_tl(val, cpu_lock_addr, cpu_lock_value,
                              cpu_R[b], dc->mem_idx, MO_TEUL);
    tcg_gen_setcond_tl(TCG_COND_EQ, cpu_sr_f, val, cpu_lock_value);
    tcg_temp_free(val);

    tcg_gen_br(lab_done);

    gen_set_label(lab_fail);
    tcg_gen_movi_tl(cpu_sr_f, 0);

    gen_set_label(lab_done);
    tcg_gen_movi_tl(cpu_lock_addr, -1);
}

static void dec_calc(DisasContext *dc, uint32_t insn)
{
    uint32_t op0, op1, op2;
    uint32_t ra, rb, rd;
    op0 = extract32(insn, 0, 4);
    op1 = extract32(insn, 8, 2);
    op2 = extract32(insn, 6, 2);
    ra = extract32(insn, 16, 5);
    rb = extract32(insn, 11, 5);
    rd = extract32(insn, 21, 5);

    switch (op1) {
    case 0:
        switch (op0) {
        case 0x0: /* l.add */
            LOG_DIS("l.add r%d, r%d, r%d\n", rd, ra, rb);
            gen_add(dc, cpu_R[rd], cpu_R[ra], cpu_R[rb]);
            return;

        case 0x1: /* l.addc */
            LOG_DIS("l.addc r%d, r%d, r%d\n", rd, ra, rb);
            gen_addc(dc, cpu_R[rd], cpu_R[ra], cpu_R[rb]);
            return;

        case 0x2: /* l.sub */
            LOG_DIS("l.sub r%d, r%d, r%d\n", rd, ra, rb);
            gen_sub(dc, cpu_R[rd], cpu_R[ra], cpu_R[rb]);
            return;

        case 0x3: /* l.and */
            LOG_DIS("l.and r%d, r%d, r%d\n", rd, ra, rb);
            tcg_gen_and_tl(cpu_R[rd], cpu_R[ra], cpu_R[rb]);
            return;

        case 0x4: /* l.or */
            LOG_DIS("l.or r%d, r%d, r%d\n", rd, ra, rb);
            tcg_gen_or_tl(cpu_R[rd], cpu_R[ra], cpu_R[rb]);
            return;

        case 0x5: /* l.xor */
            LOG_DIS("l.xor r%d, r%d, r%d\n", rd, ra, rb);
            tcg_gen_xor_tl(cpu_R[rd], cpu_R[ra], cpu_R[rb]);
            return;

        case 0x8:
            switch (op2) {
            case 0: /* l.sll */
                LOG_DIS("l.sll r%d, r%d, r%d\n", rd, ra, rb);
                tcg_gen_shl_tl(cpu_R[rd], cpu_R[ra], cpu_R[rb]);
                return;
            case 1: /* l.srl */
                LOG_DIS("l.srl r%d, r%d, r%d\n", rd, ra, rb);
                tcg_gen_shr_tl(cpu_R[rd], cpu_R[ra], cpu_R[rb]);
                return;
            case 2: /* l.sra */
                LOG_DIS("l.sra r%d, r%d, r%d\n", rd, ra, rb);
                tcg_gen_sar_tl(cpu_R[rd], cpu_R[ra], cpu_R[rb]);
                return;
            case 3: /* l.ror */
                LOG_DIS("l.ror r%d, r%d, r%d\n", rd, ra, rb);
                tcg_gen_rotr_tl(cpu_R[rd], cpu_R[ra], cpu_R[rb]);
                return;
            }
            break;

        case 0xc:
            switch (op2) {
            case 0: /* l.exths */
                LOG_DIS("l.exths r%d, r%d\n", rd, ra);
                tcg_gen_ext16s_tl(cpu_R[rd], cpu_R[ra]);
                return;
            case 1: /* l.extbs */
                LOG_DIS("l.extbs r%d, r%d\n", rd, ra);
                tcg_gen_ext8s_tl(cpu_R[rd], cpu_R[ra]);
                return;
            case 2: /* l.exthz */
                LOG_DIS("l.exthz r%d, r%d\n", rd, ra);
                tcg_gen_ext16u_tl(cpu_R[rd], cpu_R[ra]);
                return;
            case 3: /* l.extbz */
                LOG_DIS("l.extbz r%d, r%d\n", rd, ra);
                tcg_gen_ext8u_tl(cpu_R[rd], cpu_R[ra]);
                return;
            }
            break;

        case 0xd:
            switch (op2) {
            case 0: /* l.extws */
                LOG_DIS("l.extws r%d, r%d\n", rd, ra);
                tcg_gen_ext32s_tl(cpu_R[rd], cpu_R[ra]);
                return;
            case 1: /* l.extwz */
                LOG_DIS("l.extwz r%d, r%d\n", rd, ra);
                tcg_gen_ext32u_tl(cpu_R[rd], cpu_R[ra]);
                return;
            }
            break;

        case 0xe: /* l.cmov */
            LOG_DIS("l.cmov r%d, r%d, r%d\n", rd, ra, rb);
            {
                TCGv zero = tcg_const_tl(0);
                tcg_gen_movcond_tl(TCG_COND_NE, cpu_R[rd], cpu_sr_f, zero,
                                   cpu_R[ra], cpu_R[rb]);
                tcg_temp_free(zero);
            }
            return;

        case 0xf: /* l.ff1 */
            LOG_DIS("l.ff1 r%d, r%d, r%d\n", rd, ra, rb);
            tcg_gen_ctzi_tl(cpu_R[rd], cpu_R[ra], -1);
            tcg_gen_addi_tl(cpu_R[rd], cpu_R[rd], 1);
            return;
        }
        break;

    case 1:
        switch (op0) {
        case 0xf: /* l.fl1 */
            LOG_DIS("l.fl1 r%d, r%d, r%d\n", rd, ra, rb);
            tcg_gen_clzi_tl(cpu_R[rd], cpu_R[ra], TARGET_LONG_BITS);
            tcg_gen_subfi_tl(cpu_R[rd], TARGET_LONG_BITS, cpu_R[rd]);
            return;
        }
        break;

    case 2:
        break;

    case 3:
        switch (op0) {
        case 0x6: /* l.mul */
            LOG_DIS("l.mul r%d, r%d, r%d\n", rd, ra, rb);
            gen_mul(dc, cpu_R[rd], cpu_R[ra], cpu_R[rb]);
            return;

        case 0x7: /* l.muld */
            LOG_DIS("l.muld r%d, r%d\n", ra, rb);
            gen_muld(dc, cpu_R[ra], cpu_R[rb]);
            break;

        case 0x9: /* l.div */
            LOG_DIS("l.div r%d, r%d, r%d\n", rd, ra, rb);
            gen_div(dc, cpu_R[rd], cpu_R[ra], cpu_R[rb]);
            return;

        case 0xa: /* l.divu */
            LOG_DIS("l.divu r%d, r%d, r%d\n", rd, ra, rb);
            gen_divu(dc, cpu_R[rd], cpu_R[ra], cpu_R[rb]);
            return;

        case 0xb: /* l.mulu */
            LOG_DIS("l.mulu r%d, r%d, r%d\n", rd, ra, rb);
            gen_mulu(dc, cpu_R[rd], cpu_R[ra], cpu_R[rb]);
            return;

        case 0xc: /* l.muldu */
            LOG_DIS("l.muldu r%d, r%d\n", ra, rb);
            gen_muldu(dc, cpu_R[ra], cpu_R[rb]);
            return;
        }
        break;
    }
    gen_illegal_exception(dc);
}

static void dec_misc(DisasContext *dc, uint32_t insn)
{
    uint32_t op0, op1;
    uint32_t ra, rb, rd;
    uint32_t L6, K5, K16, K5_11;
    int32_t I16, I5_11, N26;
    TCGMemOp mop;
    TCGv t0;

    op0 = extract32(insn, 26, 6);
    op1 = extract32(insn, 24, 2);
    ra = extract32(insn, 16, 5);
    rb = extract32(insn, 11, 5);
    rd = extract32(insn, 21, 5);
    L6 = extract32(insn, 5, 6);
    K5 = extract32(insn, 0, 5);
    K16 = extract32(insn, 0, 16);
    I16 = (int16_t)K16;
    N26 = sextract32(insn, 0, 26);
    K5_11 = (extract32(insn, 21, 5) << 11) | extract32(insn, 0, 11);
    I5_11 = (int16_t)K5_11;

    switch (op0) {
    case 0x00:    /* l.j */
        LOG_DIS("l.j %d\n", N26);
        gen_jump(dc, N26, 0, op0);
        break;

    case 0x01:    /* l.jal */
        LOG_DIS("l.jal %d\n", N26);
        gen_jump(dc, N26, 0, op0);
        break;

    case 0x03:    /* l.bnf */
        LOG_DIS("l.bnf %d\n", N26);
        gen_jump(dc, N26, 0, op0);
        break;

    case 0x04:    /* l.bf */
        LOG_DIS("l.bf %d\n", N26);
        gen_jump(dc, N26, 0, op0);
        break;

    case 0x05:
        switch (op1) {
        case 0x01:    /* l.nop */
            LOG_DIS("l.nop %d\n", I16);
            break;

        default:
            gen_illegal_exception(dc);
            break;
        }
        break;

    case 0x11:    /* l.jr */
        LOG_DIS("l.jr r%d\n", rb);
         gen_jump(dc, 0, rb, op0);
         break;

    case 0x12:    /* l.jalr */
        LOG_DIS("l.jalr r%d\n", rb);
        gen_jump(dc, 0, rb, op0);
        break;

    case 0x13:    /* l.maci */
        LOG_DIS("l.maci r%d, %d\n", ra, I16);
        t0 = tcg_const_tl(I16);
        gen_mac(dc, cpu_R[ra], t0);
        tcg_temp_free(t0);
        break;

    case 0x09:    /* l.rfe */
        LOG_DIS("l.rfe\n");
        {
#if defined(CONFIG_USER_ONLY)
            return;
#else
            if (dc->mem_idx == MMU_USER_IDX) {
                gen_illegal_exception(dc);
                return;
            }
            gen_helper_rfe(cpu_env);
            dc->base.is_jmp = DISAS_UPDATE;
#endif
        }
        break;

    case 0x1b: /* l.lwa */
        LOG_DIS("l.lwa r%d, r%d, %d\n", rd, ra, I16);
        check_r0_write(rd);
        gen_lwa(dc, cpu_R[rd], cpu_R[ra], I16);
        break;

    case 0x1c:    /* l.cust1 */
        LOG_DIS("l.cust1\n");
        break;

    case 0x1d:    /* l.cust2 */
        LOG_DIS("l.cust2\n");
        break;

    case 0x1e:    /* l.cust3 */
        LOG_DIS("l.cust3\n");
        break;

    case 0x1f:    /* l.cust4 */
        LOG_DIS("l.cust4\n");
        break;

    case 0x3c:    /* l.cust5 */
        LOG_DIS("l.cust5 r%d, r%d, r%d, %d, %d\n", rd, ra, rb, L6, K5);
        break;

    case 0x3d:    /* l.cust6 */
        LOG_DIS("l.cust6\n");
        break;

    case 0x3e:    /* l.cust7 */
        LOG_DIS("l.cust7\n");
        break;

    case 0x3f:    /* l.cust8 */
        LOG_DIS("l.cust8\n");
        break;

/* not used yet, open it when we need or64.  */
/*#ifdef TARGET_OPENRISC64
    case 0x20:     l.ld
        LOG_DIS("l.ld r%d, r%d, %d\n", rd, ra, I16);
        check_ob64s(dc);
        mop = MO_TEQ;
        goto do_load;
#endif*/

    case 0x21:    /* l.lwz */
        LOG_DIS("l.lwz r%d, r%d, %d\n", rd, ra, I16);
        mop = MO_TEUL;
        goto do_load;

    case 0x22:    /* l.lws */
        LOG_DIS("l.lws r%d, r%d, %d\n", rd, ra, I16);
        mop = MO_TESL;
        goto do_load;

    case 0x23:    /* l.lbz */
        LOG_DIS("l.lbz r%d, r%d, %d\n", rd, ra, I16);
        mop = MO_UB;
        goto do_load;

    case 0x24:    /* l.lbs */
        LOG_DIS("l.lbs r%d, r%d, %d\n", rd, ra, I16);
        mop = MO_SB;
        goto do_load;

    case 0x25:    /* l.lhz */
        LOG_DIS("l.lhz r%d, r%d, %d\n", rd, ra, I16);
        mop = MO_TEUW;
        goto do_load;

    case 0x26:    /* l.lhs */
        LOG_DIS("l.lhs r%d, r%d, %d\n", rd, ra, I16);
        mop = MO_TESW;
        goto do_load;

    do_load:
        check_r0_write(rd);
        t0 = tcg_temp_new();
        tcg_gen_addi_tl(t0, cpu_R[ra], I16);
        tcg_gen_qemu_ld_tl(cpu_R[rd], t0, dc->mem_idx, mop);
        tcg_temp_free(t0);
        break;

    case 0x27:    /* l.addi */
        LOG_DIS("l.addi r%d, r%d, %d\n", rd, ra, I16);
        check_r0_write(rd);
        t0 = tcg_const_tl(I16);
        gen_add(dc, cpu_R[rd], cpu_R[ra], t0);
        tcg_temp_free(t0);
        break;

    case 0x28:    /* l.addic */
        LOG_DIS("l.addic r%d, r%d, %d\n", rd, ra, I16);
        check_r0_write(rd);
        t0 = tcg_const_tl(I16);
        gen_addc(dc, cpu_R[rd], cpu_R[ra], t0);
        tcg_temp_free(t0);
        break;

    case 0x29:    /* l.andi */
        LOG_DIS("l.andi r%d, r%d, %d\n", rd, ra, K16);
        check_r0_write(rd);
        tcg_gen_andi_tl(cpu_R[rd], cpu_R[ra], K16);
        break;

    case 0x2a:    /* l.ori */
        LOG_DIS("l.ori r%d, r%d, %d\n", rd, ra, K16);
        check_r0_write(rd);
        tcg_gen_ori_tl(cpu_R[rd], cpu_R[ra], K16);
        break;

    case 0x2b:    /* l.xori */
        LOG_DIS("l.xori r%d, r%d, %d\n", rd, ra, I16);
        check_r0_write(rd);
        tcg_gen_xori_tl(cpu_R[rd], cpu_R[ra], I16);
        break;

    case 0x2c:    /* l.muli */
        LOG_DIS("l.muli r%d, r%d, %d\n", rd, ra, I16);
        check_r0_write(rd);
        t0 = tcg_const_tl(I16);
        gen_mul(dc, cpu_R[rd], cpu_R[ra], t0);
        tcg_temp_free(t0);
        break;

    case 0x2d:    /* l.mfspr */
        LOG_DIS("l.mfspr r%d, r%d, %d\n", rd, ra, K16);
        check_r0_write(rd);
        {
#if defined(CONFIG_USER_ONLY)
            return;
#else
            TCGv_i32 ti = tcg_const_i32(K16);
            if (dc->mem_idx == MMU_USER_IDX) {
                gen_illegal_exception(dc);
                return;
            }
            gen_helper_mfspr(cpu_R[rd], cpu_env, cpu_R[rd], cpu_R[ra], ti);
            tcg_temp_free_i32(ti);
#endif
        }
        break;

    case 0x30:    /* l.mtspr */
        LOG_DIS("l.mtspr r%d, r%d, %d\n", ra, rb, K5_11);
        {
#if defined(CONFIG_USER_ONLY)
            return;
#else
            TCGv_i32 im = tcg_const_i32(K5_11);
            if (dc->mem_idx == MMU_USER_IDX) {
                gen_illegal_exception(dc);
                return;
            }
            gen_helper_mtspr(cpu_env, cpu_R[ra], cpu_R[rb], im);
            tcg_temp_free_i32(im);
#endif
        }
        break;

    case 0x33: /* l.swa */
        LOG_DIS("l.swa r%d, r%d, %d\n", ra, rb, I5_11);
        gen_swa(dc, rb, cpu_R[ra], I5_11);
        break;

/* not used yet, open it when we need or64.  */
/*#ifdef TARGET_OPENRISC64
    case 0x34:     l.sd
        LOG_DIS("l.sd r%d, r%d, %d\n", ra, rb, I5_11);
        check_ob64s(dc);
        mop = MO_TEQ;
        goto do_store;
#endif*/

    case 0x35:    /* l.sw */
        LOG_DIS("l.sw r%d, r%d, %d\n", ra, rb, I5_11);
        mop = MO_TEUL;
        goto do_store;

    case 0x36:    /* l.sb */
        LOG_DIS("l.sb r%d, r%d, %d\n", ra, rb, I5_11);
        mop = MO_UB;
        goto do_store;

    case 0x37:    /* l.sh */
        LOG_DIS("l.sh r%d, r%d, %d\n", ra, rb, I5_11);
        mop = MO_TEUW;
        goto do_store;

    do_store:
        {
            TCGv t0 = tcg_temp_new();
            tcg_gen_addi_tl(t0, cpu_R[ra], I5_11);
            tcg_gen_qemu_st_tl(cpu_R[rb], t0, dc->mem_idx, mop);
            tcg_temp_free(t0);
        }
        break;

    default:
        gen_illegal_exception(dc);
        break;
    }
}

static void dec_mac(DisasContext *dc, uint32_t insn)
{
    uint32_t op0;
    uint32_t ra, rb;
    op0 = extract32(insn, 0, 4);
    ra = extract32(insn, 16, 5);
    rb = extract32(insn, 11, 5);

    switch (op0) {
    case 0x0001:    /* l.mac */
        LOG_DIS("l.mac r%d, r%d\n", ra, rb);
        gen_mac(dc, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x0002:    /* l.msb */
        LOG_DIS("l.msb r%d, r%d\n", ra, rb);
        gen_msb(dc, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x0003:    /* l.macu */
        LOG_DIS("l.macu r%d, r%d\n", ra, rb);
        gen_macu(dc, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x0004:    /* l.msbu */
        LOG_DIS("l.msbu r%d, r%d\n", ra, rb);
        gen_msbu(dc, cpu_R[ra], cpu_R[rb]);
        break;

    default:
        gen_illegal_exception(dc);
        break;
   }
}

static void dec_logic(DisasContext *dc, uint32_t insn)
{
    uint32_t op0;
    uint32_t rd, ra, L6, S6;
    op0 = extract32(insn, 6, 2);
    rd = extract32(insn, 21, 5);
    ra = extract32(insn, 16, 5);
    L6 = extract32(insn, 0, 6);
    S6 = L6 & (TARGET_LONG_BITS - 1);

    check_r0_write(rd);
    switch (op0) {
    case 0x00:    /* l.slli */
        LOG_DIS("l.slli r%d, r%d, %d\n", rd, ra, L6);
        tcg_gen_shli_tl(cpu_R[rd], cpu_R[ra], S6);
        break;

    case 0x01:    /* l.srli */
        LOG_DIS("l.srli r%d, r%d, %d\n", rd, ra, L6);
        tcg_gen_shri_tl(cpu_R[rd], cpu_R[ra], S6);
        break;

    case 0x02:    /* l.srai */
        LOG_DIS("l.srai r%d, r%d, %d\n", rd, ra, L6);
        tcg_gen_sari_tl(cpu_R[rd], cpu_R[ra], S6);
        break;

    case 0x03:    /* l.rori */
        LOG_DIS("l.rori r%d, r%d, %d\n", rd, ra, L6);
        tcg_gen_rotri_tl(cpu_R[rd], cpu_R[ra], S6);
        break;

    default:
        gen_illegal_exception(dc);
        break;
    }
}

static void dec_M(DisasContext *dc, uint32_t insn)
{
    uint32_t op0;
    uint32_t rd;
    uint32_t K16;
    op0 = extract32(insn, 16, 1);
    rd = extract32(insn, 21, 5);
    K16 = extract32(insn, 0, 16);

    check_r0_write(rd);
    switch (op0) {
    case 0x0:    /* l.movhi */
        LOG_DIS("l.movhi  r%d, %d\n", rd, K16);
        tcg_gen_movi_tl(cpu_R[rd], (K16 << 16));
        break;

    case 0x1:    /* l.macrc */
        LOG_DIS("l.macrc  r%d\n", rd);
        tcg_gen_trunc_i64_tl(cpu_R[rd], cpu_mac);
        tcg_gen_movi_i64(cpu_mac, 0);
        break;

    default:
        gen_illegal_exception(dc);
        break;
    }
}

static void dec_comp(DisasContext *dc, uint32_t insn)
{
    uint32_t op0;
    uint32_t ra, rb;

    op0 = extract32(insn, 21, 5);
    ra = extract32(insn, 16, 5);
    rb = extract32(insn, 11, 5);

    /* unsigned integers  */
    tcg_gen_ext32u_tl(cpu_R[ra], cpu_R[ra]);
    tcg_gen_ext32u_tl(cpu_R[rb], cpu_R[rb]);

    switch (op0) {
    case 0x0:    /* l.sfeq */
        LOG_DIS("l.sfeq  r%d, r%d\n", ra, rb);
        tcg_gen_setcond_tl(TCG_COND_EQ, cpu_sr_f, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x1:    /* l.sfne */
        LOG_DIS("l.sfne  r%d, r%d\n", ra, rb);
        tcg_gen_setcond_tl(TCG_COND_NE, cpu_sr_f, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x2:    /* l.sfgtu */
        LOG_DIS("l.sfgtu  r%d, r%d\n", ra, rb);
        tcg_gen_setcond_tl(TCG_COND_GTU, cpu_sr_f, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x3:    /* l.sfgeu */
        LOG_DIS("l.sfgeu  r%d, r%d\n", ra, rb);
        tcg_gen_setcond_tl(TCG_COND_GEU, cpu_sr_f, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x4:    /* l.sfltu */
        LOG_DIS("l.sfltu  r%d, r%d\n", ra, rb);
        tcg_gen_setcond_tl(TCG_COND_LTU, cpu_sr_f, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x5:    /* l.sfleu */
        LOG_DIS("l.sfleu  r%d, r%d\n", ra, rb);
        tcg_gen_setcond_tl(TCG_COND_LEU, cpu_sr_f, cpu_R[ra], cpu_R[rb]);
        break;

    case 0xa:    /* l.sfgts */
        LOG_DIS("l.sfgts  r%d, r%d\n", ra, rb);
        tcg_gen_setcond_tl(TCG_COND_GT, cpu_sr_f, cpu_R[ra], cpu_R[rb]);
        break;

    case 0xb:    /* l.sfges */
        LOG_DIS("l.sfges  r%d, r%d\n", ra, rb);
        tcg_gen_setcond_tl(TCG_COND_GE, cpu_sr_f, cpu_R[ra], cpu_R[rb]);
        break;

    case 0xc:    /* l.sflts */
        LOG_DIS("l.sflts  r%d, r%d\n", ra, rb);
        tcg_gen_setcond_tl(TCG_COND_LT, cpu_sr_f, cpu_R[ra], cpu_R[rb]);
        break;

    case 0xd:    /* l.sfles */
        LOG_DIS("l.sfles  r%d, r%d\n", ra, rb);
        tcg_gen_setcond_tl(TCG_COND_LE, cpu_sr_f, cpu_R[ra], cpu_R[rb]);
        break;

    default:
        gen_illegal_exception(dc);
        break;
    }
}

static void dec_compi(DisasContext *dc, uint32_t insn)
{
    uint32_t op0, ra;
    int32_t I16;

    op0 = extract32(insn, 21, 5);
    ra = extract32(insn, 16, 5);
    I16 = sextract32(insn, 0, 16);

    switch (op0) {
    case 0x0:    /* l.sfeqi */
        LOG_DIS("l.sfeqi  r%d, %d\n", ra, I16);
        tcg_gen_setcondi_tl(TCG_COND_EQ, cpu_sr_f, cpu_R[ra], I16);
        break;

    case 0x1:    /* l.sfnei */
        LOG_DIS("l.sfnei  r%d, %d\n", ra, I16);
        tcg_gen_setcondi_tl(TCG_COND_NE, cpu_sr_f, cpu_R[ra], I16);
        break;

    case 0x2:    /* l.sfgtui */
        LOG_DIS("l.sfgtui  r%d, %d\n", ra, I16);
        tcg_gen_setcondi_tl(TCG_COND_GTU, cpu_sr_f, cpu_R[ra], I16);
        break;

    case 0x3:    /* l.sfgeui */
        LOG_DIS("l.sfgeui  r%d, %d\n", ra, I16);
        tcg_gen_setcondi_tl(TCG_COND_GEU, cpu_sr_f, cpu_R[ra], I16);
        break;

    case 0x4:    /* l.sfltui */
        LOG_DIS("l.sfltui  r%d, %d\n", ra, I16);
        tcg_gen_setcondi_tl(TCG_COND_LTU, cpu_sr_f, cpu_R[ra], I16);
        break;

    case 0x5:    /* l.sfleui */
        LOG_DIS("l.sfleui  r%d, %d\n", ra, I16);
        tcg_gen_setcondi_tl(TCG_COND_LEU, cpu_sr_f, cpu_R[ra], I16);
        break;

    case 0xa:    /* l.sfgtsi */
        LOG_DIS("l.sfgtsi  r%d, %d\n", ra, I16);
        tcg_gen_setcondi_tl(TCG_COND_GT, cpu_sr_f, cpu_R[ra], I16);
        break;

    case 0xb:    /* l.sfgesi */
        LOG_DIS("l.sfgesi  r%d, %d\n", ra, I16);
        tcg_gen_setcondi_tl(TCG_COND_GE, cpu_sr_f, cpu_R[ra], I16);
        break;

    case 0xc:    /* l.sfltsi */
        LOG_DIS("l.sfltsi  r%d, %d\n", ra, I16);
        tcg_gen_setcondi_tl(TCG_COND_LT, cpu_sr_f, cpu_R[ra], I16);
        break;

    case 0xd:    /* l.sflesi */
        LOG_DIS("l.sflesi  r%d, %d\n", ra, I16);
        tcg_gen_setcondi_tl(TCG_COND_LE, cpu_sr_f, cpu_R[ra], I16);
        break;

    default:
        gen_illegal_exception(dc);
        break;
    }
}

static void dec_sys(DisasContext *dc, uint32_t insn)
{
    uint32_t op0;
    uint32_t K16;

    op0 = extract32(insn, 16, 10);
    K16 = extract32(insn, 0, 16);

    switch (op0) {
    case 0x000:    /* l.sys */
        LOG_DIS("l.sys %d\n", K16);
        tcg_gen_movi_tl(cpu_pc, dc->base.pc_next);
        gen_exception(dc, EXCP_SYSCALL);
        dc->base.is_jmp = DISAS_NORETURN;
        break;

    case 0x100:    /* l.trap */
        LOG_DIS("l.trap %d\n", K16);
        tcg_gen_movi_tl(cpu_pc, dc->base.pc_next);
        gen_exception(dc, EXCP_TRAP);
        dc->base.is_jmp = DISAS_NORETURN;
        break;

    case 0x300:    /* l.csync */
        LOG_DIS("l.csync\n");
        break;

    case 0x200:    /* l.msync */
        LOG_DIS("l.msync\n");
        tcg_gen_mb(TCG_MO_ALL);
        break;

    case 0x270:    /* l.psync */
        LOG_DIS("l.psync\n");
        break;

    default:
        gen_illegal_exception(dc);
        break;
    }
}

static void dec_float(DisasContext *dc, uint32_t insn)
{
    uint32_t op0;
    uint32_t ra, rb, rd;
    op0 = extract32(insn, 0, 8);
    ra = extract32(insn, 16, 5);
    rb = extract32(insn, 11, 5);
    rd = extract32(insn, 21, 5);

    switch (op0) {
    case 0x00:    /* lf.add.s */
        LOG_DIS("lf.add.s r%d, r%d, r%d\n", rd, ra, rb);
        check_r0_write(rd);
        gen_helper_float_add_s(cpu_R[rd], cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x01:    /* lf.sub.s */
        LOG_DIS("lf.sub.s r%d, r%d, r%d\n", rd, ra, rb);
        check_r0_write(rd);
        gen_helper_float_sub_s(cpu_R[rd], cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x02:    /* lf.mul.s */
        LOG_DIS("lf.mul.s r%d, r%d, r%d\n", rd, ra, rb);
        check_r0_write(rd);
        gen_helper_float_mul_s(cpu_R[rd], cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x03:    /* lf.div.s */
        LOG_DIS("lf.div.s r%d, r%d, r%d\n", rd, ra, rb);
        check_r0_write(rd);
        gen_helper_float_div_s(cpu_R[rd], cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x04:    /* lf.itof.s */
        LOG_DIS("lf.itof r%d, r%d\n", rd, ra);
        check_r0_write(rd);
        gen_helper_itofs(cpu_R[rd], cpu_env, cpu_R[ra]);
        break;

    case 0x05:    /* lf.ftoi.s */
        LOG_DIS("lf.ftoi r%d, r%d\n", rd, ra);
        check_r0_write(rd);
        gen_helper_ftois(cpu_R[rd], cpu_env, cpu_R[ra]);
        break;

    case 0x06:    /* lf.rem.s */
        LOG_DIS("lf.rem.s r%d, r%d, r%d\n", rd, ra, rb);
        check_r0_write(rd);
        gen_helper_float_rem_s(cpu_R[rd], cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x07:    /* lf.madd.s */
        LOG_DIS("lf.madd.s r%d, r%d, r%d\n", rd, ra, rb);
        check_r0_write(rd);
        gen_helper_float_madd_s(cpu_R[rd], cpu_env, cpu_R[rd],
                                cpu_R[ra], cpu_R[rb]);
        break;

    case 0x08:    /* lf.sfeq.s */
        LOG_DIS("lf.sfeq.s r%d, r%d\n", ra, rb);
        gen_helper_float_eq_s(cpu_sr_f, cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x09:    /* lf.sfne.s */
        LOG_DIS("lf.sfne.s r%d, r%d\n", ra, rb);
        gen_helper_float_ne_s(cpu_sr_f, cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x0a:    /* lf.sfgt.s */
        LOG_DIS("lf.sfgt.s r%d, r%d\n", ra, rb);
        gen_helper_float_gt_s(cpu_sr_f, cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x0b:    /* lf.sfge.s */
        LOG_DIS("lf.sfge.s r%d, r%d\n", ra, rb);
        gen_helper_float_ge_s(cpu_sr_f, cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x0c:    /* lf.sflt.s */
        LOG_DIS("lf.sflt.s r%d, r%d\n", ra, rb);
        gen_helper_float_lt_s(cpu_sr_f, cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x0d:    /* lf.sfle.s */
        LOG_DIS("lf.sfle.s r%d, r%d\n", ra, rb);
        gen_helper_float_le_s(cpu_sr_f, cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

/* not used yet, open it when we need or64.  */
/*#ifdef TARGET_OPENRISC64
    case 0x10:     lf.add.d
        LOG_DIS("lf.add.d r%d, r%d, r%d\n", rd, ra, rb);
        check_of64s(dc);
        check_r0_write(rd);
        gen_helper_float_add_d(cpu_R[rd], cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x11:     lf.sub.d
        LOG_DIS("lf.sub.d r%d, r%d, r%d\n", rd, ra, rb);
        check_of64s(dc);
        check_r0_write(rd);
        gen_helper_float_sub_d(cpu_R[rd], cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x12:     lf.mul.d
        LOG_DIS("lf.mul.d r%d, r%d, r%d\n", rd, ra, rb);
        check_of64s(dc);
        check_r0_write(rd);
        gen_helper_float_mul_d(cpu_R[rd], cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x13:     lf.div.d
        LOG_DIS("lf.div.d r%d, r%d, r%d\n", rd, ra, rb);
        check_of64s(dc);
        check_r0_write(rd);
        gen_helper_float_div_d(cpu_R[rd], cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x14:     lf.itof.d
        LOG_DIS("lf.itof r%d, r%d\n", rd, ra);
        check_of64s(dc);
        check_r0_write(rd);
        gen_helper_itofd(cpu_R[rd], cpu_env, cpu_R[ra]);
        break;

    case 0x15:     lf.ftoi.d
        LOG_DIS("lf.ftoi r%d, r%d\n", rd, ra);
        check_of64s(dc);
        check_r0_write(rd);
        gen_helper_ftoid(cpu_R[rd], cpu_env, cpu_R[ra]);
        break;

    case 0x16:     lf.rem.d
        LOG_DIS("lf.rem.d r%d, r%d, r%d\n", rd, ra, rb);
        check_of64s(dc);
        check_r0_write(rd);
        gen_helper_float_rem_d(cpu_R[rd], cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x17:     lf.madd.d
        LOG_DIS("lf.madd.d r%d, r%d, r%d\n", rd, ra, rb);
        check_of64s(dc);
        check_r0_write(rd);
        gen_helper_float_madd_d(cpu_R[rd], cpu_env, cpu_R[rd],
                                cpu_R[ra], cpu_R[rb]);
        break;

    case 0x18:     lf.sfeq.d
        LOG_DIS("lf.sfeq.d r%d, r%d\n", ra, rb);
        check_of64s(dc);
        gen_helper_float_eq_d(cpu_sr_f, cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x1a:     lf.sfgt.d
        LOG_DIS("lf.sfgt.d r%d, r%d\n", ra, rb);
        check_of64s(dc);
        gen_helper_float_gt_d(cpu_sr_f, cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x1b:     lf.sfge.d
        LOG_DIS("lf.sfge.d r%d, r%d\n", ra, rb);
        check_of64s(dc);
        gen_helper_float_ge_d(cpu_sr_f, cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x19:     lf.sfne.d
        LOG_DIS("lf.sfne.d r%d, r%d\n", ra, rb);
        check_of64s(dc);
        gen_helper_float_ne_d(cpu_sr_f, cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x1c:     lf.sflt.d
        LOG_DIS("lf.sflt.d r%d, r%d\n", ra, rb);
        check_of64s(dc);
        gen_helper_float_lt_d(cpu_sr_f, cpu_env, cpu_R[ra], cpu_R[rb]);
        break;

    case 0x1d:     lf.sfle.d
        LOG_DIS("lf.sfle.d r%d, r%d\n", ra, rb);
        check_of64s(dc);
        gen_helper_float_le_d(cpu_sr_f, cpu_env, cpu_R[ra], cpu_R[rb]);
        break;
#endif*/

    default:
        gen_illegal_exception(dc);
        break;
    }
}

static void disas_openrisc_insn(DisasContext *dc, OpenRISCCPU *cpu)
{
    uint32_t op0;
    uint32_t insn;
    insn = cpu_ldl_code(&cpu->env, dc->base.pc_next);
    op0 = extract32(insn, 26, 6);

    switch (op0) {
    case 0x06:
        dec_M(dc, insn);
        break;

    case 0x08:
        dec_sys(dc, insn);
        break;

    case 0x2e:
        dec_logic(dc, insn);
        break;

    case 0x2f:
        dec_compi(dc, insn);
        break;

    case 0x31:
        dec_mac(dc, insn);
        break;

    case 0x32:
        dec_float(dc, insn);
        break;

    case 0x38:
        dec_calc(dc, insn);
        break;

    case 0x39:
        dec_comp(dc, insn);
        break;

    default:
        dec_misc(dc, insn);
        break;
    }
}

static void openrisc_tr_init_disas_context(DisasContextBase *dcb, CPUState *cs)
{
    DisasContext *dc = container_of(dcb, DisasContext, base);
    CPUOpenRISCState *env = cs->env_ptr;
    int bound;

    dc->mem_idx = cpu_mmu_index(env, false);
    dc->tb_flags = dc->base.tb->flags;
    dc->delayed_branch = (dc->tb_flags & TB_FLAGS_DFLAG) != 0;
    bound = -(dc->base.pc_first | TARGET_PAGE_MASK) / 4;
    dc->base.max_insns = MIN(dc->base.max_insns, bound);
}

static void openrisc_tr_tb_start(DisasContextBase *db, CPUState *cs)
{
    DisasContext *dc = container_of(db, DisasContext, base);

    /* Allow the TCG optimizer to see that R0 == 0,
       when it's true, which is the common case.  */
    if (dc->tb_flags & TB_FLAGS_R0_0) {
        cpu_R[0] = tcg_const_tl(0);
    } else {
        cpu_R[0] = cpu_R0;
    }
}

static void openrisc_tr_insn_start(DisasContextBase *dcbase, CPUState *cs)
{
    DisasContext *dc = container_of(dcbase, DisasContext, base);

    tcg_gen_insn_start(dc->base.pc_next, (dc->delayed_branch ? 1 : 0)
                       | (dc->base.num_insns > 1 ? 2 : 0));
}

static bool openrisc_tr_breakpoint_check(DisasContextBase *dcbase, CPUState *cs,
                                         const CPUBreakpoint *bp)
{
    DisasContext *dc = container_of(dcbase, DisasContext, base);

    tcg_gen_movi_tl(cpu_pc, dc->base.pc_next);
    gen_exception(dc, EXCP_DEBUG);
    dc->base.is_jmp = DISAS_NORETURN;
    /* The address covered by the breakpoint must be included in
       [tb->pc, tb->pc + tb->size) in order to for it to be
       properly cleared -- thus we increment the PC here so that
       the logic setting tb->size below does the right thing.  */
    dc->base.pc_next += 4;
    return true;
}

static void openrisc_tr_translate_insn(DisasContextBase *dcbase, CPUState *cs)
{
    DisasContext *dc = container_of(dcbase, DisasContext, base);
    OpenRISCCPU *cpu = OPENRISC_CPU(cs);

    disas_openrisc_insn(dc, cpu);
    dc->base.pc_next += 4;

    /* delay slot */
    if (dc->delayed_branch) {
        dc->delayed_branch--;
        if (!dc->delayed_branch) {
            tcg_gen_mov_tl(cpu_pc, jmp_pc);
            tcg_gen_discard_tl(jmp_pc);
            dc->base.is_jmp = DISAS_UPDATE;
            return;
        }
    }
}

static void openrisc_tr_tb_stop(DisasContextBase *dcbase, CPUState *cs)
{
    DisasContext *dc = container_of(dcbase, DisasContext, base);

    if ((dc->tb_flags & TB_FLAGS_DFLAG ? 1 : 0) != (dc->delayed_branch != 0)) {
        tcg_gen_movi_i32(cpu_dflag, dc->delayed_branch != 0);
    }

    tcg_gen_movi_tl(cpu_ppc, dc->base.pc_next - 4);
    if (dc->base.is_jmp == DISAS_NEXT) {
        dc->base.is_jmp = DISAS_UPDATE;
        tcg_gen_movi_tl(cpu_pc, dc->base.pc_next);
    }
    if (unlikely(dc->base.singlestep_enabled)) {
        gen_exception(dc, EXCP_DEBUG);
    } else {
        switch (dc->base.is_jmp) {
        case DISAS_TOO_MANY:
            gen_goto_tb(dc, 0, dc->base.pc_next);
            break;
        case DISAS_NORETURN:
        case DISAS_JUMP:
        case DISAS_TB_JUMP:
            break;
        case DISAS_UPDATE:
            /* indicate that the hash table must be used
               to find the next TB */
            tcg_gen_exit_tb(0);
            break;
        default:
            g_assert_not_reached();
        }
    }
}

static void openrisc_tr_disas_log(const DisasContextBase *dcbase, CPUState *cs)
{
    DisasContext *s = container_of(dcbase, DisasContext, base);

    qemu_log("IN: %s\n", lookup_symbol(s->base.pc_first));
    log_target_disas(cs, s->base.pc_first, s->base.tb->size);
}

static const TranslatorOps openrisc_tr_ops = {
    .init_disas_context = openrisc_tr_init_disas_context,
    .tb_start           = openrisc_tr_tb_start,
    .insn_start         = openrisc_tr_insn_start,
    .breakpoint_check   = openrisc_tr_breakpoint_check,
    .translate_insn     = openrisc_tr_translate_insn,
    .tb_stop            = openrisc_tr_tb_stop,
    .disas_log          = openrisc_tr_disas_log,
};

void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb)
{
    DisasContext ctx;

    translator_loop(&openrisc_tr_ops, &ctx.base, cs, tb);
}

void openrisc_cpu_dump_state(CPUState *cs, FILE *f,
                             fprintf_function cpu_fprintf,
                             int flags)
{
    OpenRISCCPU *cpu = OPENRISC_CPU(cs);
    CPUOpenRISCState *env = &cpu->env;
    int i;

    cpu_fprintf(f, "PC=%08x\n", env->pc);
    for (i = 0; i < 32; ++i) {
        cpu_fprintf(f, "R%02d=%08x%c", i, cpu_get_gpr(env, i),
                    (i % 4) == 3 ? '\n' : ' ');
    }
}

void restore_state_to_opc(CPUOpenRISCState *env, TranslationBlock *tb,
                          target_ulong *data)
{
    env->pc = data[0];
    env->dflag = data[1] & 1;
    if (data[1] & 2) {
        env->ppc = env->pc - 4;
    }
}