Archipelago » qemu

/*

 * Tiny Code Generator for QEMU

 *

 * Copyright (c) 2008-2009 Arnaud Patard <arnaud.patard@rtp-net.org>

 * Copyright (c) 2009 Aurelien Jarno <aurelien@aurel32.net>

 * Based on i386/tcg-target.c - Copyright (c) 2008 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#if defined(TCG_TARGET_WORDS_BIGENDIAN) == defined(TARGET_WORDS_BIGENDIAN)

# define TCG_NEED_BSWAP 0

#else

# define TCG_NEED_BSWAP 1

#endif

#ifndef NDEBUG

static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {

    "zero",

    "at",

    "v0",

    "v1",

    "a0",

    "a1",

    "a2",

    "a3",

    "t0",

    "t1",

    "t2",

    "t3",

    "t4",

    "t5",

    "t6",

    "t7",

    "s0",

    "s1",

    "s2",

    "s3",

    "s4",

    "s5",

    "s6",

    "s7",

    "t8",

    "t9",

    "k0",

    "k1",

    "gp",

    "sp",

    "fp",

    "ra",

};

#endif

/* check if we really need so many registers :P */

static const int tcg_target_reg_alloc_order[] = {

    TCG_REG_S0,

    TCG_REG_S1,

    TCG_REG_S2,

    TCG_REG_S3,

    TCG_REG_S4,

    TCG_REG_S5,

    TCG_REG_S6,

    TCG_REG_S7,

    TCG_REG_T1,

    TCG_REG_T2,

    TCG_REG_T3,

    TCG_REG_T4,

    TCG_REG_T5,

    TCG_REG_T6,

    TCG_REG_T7,

    TCG_REG_T8,

    TCG_REG_T9,

    TCG_REG_A0,

    TCG_REG_A1,

    TCG_REG_A2,

    TCG_REG_A3,

    TCG_REG_V0,

    TCG_REG_V1

};

static const int tcg_target_call_iarg_regs[4] = {

    TCG_REG_A0,

    TCG_REG_A1,

    TCG_REG_A2,

    TCG_REG_A3

};

static const int tcg_target_call_oarg_regs[2] = {

    TCG_REG_V0,

    TCG_REG_V1

};

static uint8_t *tb_ret_addr;

static inline uint32_t reloc_lo16_val (void *pc, tcg_target_long target)

{

    return target & 0xffff;

}

static inline void reloc_lo16 (void *pc, tcg_target_long target)

{

    *(uint32_t *) pc = (*(uint32_t *) pc & ~0xffff)

                       | reloc_lo16_val(pc, target);

}

static inline uint32_t reloc_hi16_val (void *pc, tcg_target_long target)

{

    return (target >> 16) & 0xffff;

}

static inline void reloc_hi16 (void *pc, tcg_target_long target)

{

    *(uint32_t *) pc = (*(uint32_t *) pc & ~0xffff)

                       | reloc_hi16_val(pc, target);

}

static inline uint32_t reloc_pc16_val (void *pc, tcg_target_long target)

{

    int32_t disp;

    disp = target - (tcg_target_long) pc - 4;

    if (disp != (disp << 14) >> 14) {

        tcg_abort ();

    }

    return (disp >> 2) & 0xffff;

}

static inline void reloc_pc16 (void *pc, tcg_target_long target)

{

    *(uint32_t *) pc = (*(uint32_t *) pc & ~0xffff)

                       | reloc_pc16_val(pc, target);

}

static inline uint32_t reloc_26_val (void *pc, tcg_target_long target)

{

    if ((((tcg_target_long)pc + 4) & 0xf0000000) != (target & 0xf0000000)) {

        tcg_abort ();

    }

    return (target >> 2) & 0x3ffffff;

}

static inline void reloc_pc26 (void *pc, tcg_target_long target)

{

    *(uint32_t *) pc = (*(uint32_t *) pc & ~0x3ffffff)

                       | reloc_26_val(pc, target);

}

static void patch_reloc(uint8_t *code_ptr, int type,

                        tcg_target_long value, tcg_target_long addend)

{

    value += addend;

    switch(type) {

    case R_MIPS_LO16:

        reloc_lo16(code_ptr, value);

        break;

    case R_MIPS_HI16:

        reloc_hi16(code_ptr, value);

        break;

    case R_MIPS_PC16:

        reloc_pc16(code_ptr, value);

        break;

    case R_MIPS_26:

        reloc_pc26(code_ptr, value);

        break;

    default:

        tcg_abort();

    }

}

/* maximum number of register used for input function arguments */

static inline int tcg_target_get_call_iarg_regs_count(int flags)

{

    return 4;

}

/* parse target specific constraints */

static int target_parse_constraint(TCGArgConstraint *ct, const char **pct_str)

{

    const char *ct_str;

    ct_str = *pct_str;

    switch(ct_str[0]) {

    case 'r':

        ct->ct |= TCG_CT_REG;

        tcg_regset_set(ct->u.regs, 0xffffffff);

        break;

    case 'C':

        ct->ct |= TCG_CT_REG;

        tcg_regset_clear(ct->u.regs);

        tcg_regset_set_reg(ct->u.regs, TCG_REG_T9);

        break;

    case 'L': /* qemu_ld output arg constraint */

        ct->ct |= TCG_CT_REG;

        tcg_regset_set(ct->u.regs, 0xffffffff);

        tcg_regset_reset_reg(ct->u.regs, TCG_REG_V0);

        break;

    case 'l': /* qemu_ld input arg constraint */

        ct->ct |= TCG_CT_REG;

        tcg_regset_set(ct->u.regs, 0xffffffff);

#if defined(CONFIG_SOFTMMU)

        tcg_regset_reset_reg(ct->u.regs, TCG_REG_A0);

#endif

        break;

    case 'S': /* qemu_st constraint */

        ct->ct |= TCG_CT_REG;

        tcg_regset_set(ct->u.regs, 0xffffffff);

#if defined(CONFIG_SOFTMMU)

        tcg_regset_reset_reg(ct->u.regs, TCG_REG_A0);

# if TARGET_LONG_BITS == 64

        tcg_regset_reset_reg(ct->u.regs, TCG_REG_A1);

# endif

        tcg_regset_reset_reg(ct->u.regs, TCG_REG_A2);

#endif

        break;

    case 'I':

        ct->ct |= TCG_CT_CONST_U16;

        break;

    case 'J':

        ct->ct |= TCG_CT_CONST_S16;

        break;

    case 'Z':

        /* We are cheating a bit here, using the fact that the register

           ZERO is also the register number 0. Hence there is no need

           to check for const_args in each instruction. */

        ct->ct |= TCG_CT_CONST_ZERO;

        break;

    default:

        return -1;

    }

    ct_str++;

    *pct_str = ct_str;

    return 0;

}

/* test if a constant matches the constraint */

static inline int tcg_target_const_match(tcg_target_long val,

                                         const TCGArgConstraint *arg_ct)

{

    int ct;

    ct = arg_ct->ct;

    if (ct & TCG_CT_CONST)

        return 1;

    else if ((ct & TCG_CT_CONST_ZERO) && val == 0)

        return 1;

    else if ((ct & TCG_CT_CONST_U16) && val == (uint16_t)val)

        return 1;

    else if ((ct & TCG_CT_CONST_S16) && val == (int16_t)val)

        return 1;

    else

        return 0;

}

/* instruction opcodes */

enum {

    OPC_SPECIAL  = 0x00 << 26,

    OPC_BEQ      = 0x04 << 26,

    OPC_BNE      = 0x05 << 26,

    OPC_ADDIU    = 0x09 << 26,

    OPC_SLTI     = 0x0A << 26,

    OPC_SLTIU    = 0x0B << 26,

    OPC_ANDI     = 0x0C << 26,

    OPC_ORI      = 0x0D << 26,

    OPC_XORI     = 0x0E << 26,

    OPC_LUI      = 0x0F << 26,

    OPC_LB       = 0x20 << 26,

    OPC_LH       = 0x21 << 26,

    OPC_LW       = 0x23 << 26,

    OPC_LBU      = 0x24 << 26,

    OPC_LHU      = 0x25 << 26,

    OPC_LWU      = 0x27 << 26,

    OPC_SB       = 0x28 << 26,

    OPC_SH       = 0x29 << 26,

    OPC_SW       = 0x2B << 26,

    OPC_SLL      = OPC_SPECIAL | 0x00,

    OPC_SRL      = OPC_SPECIAL | 0x02,

    OPC_SRA      = OPC_SPECIAL | 0x03,

    OPC_SLLV     = OPC_SPECIAL | 0x04,

    OPC_SRLV     = OPC_SPECIAL | 0x06,

    OPC_SRAV     = OPC_SPECIAL | 0x07,

    OPC_JR       = OPC_SPECIAL | 0x08,

    OPC_JALR     = OPC_SPECIAL | 0x09,

    OPC_MFHI     = OPC_SPECIAL | 0x10,

    OPC_MFLO     = OPC_SPECIAL | 0x12,

    OPC_MULT     = OPC_SPECIAL | 0x18,

    OPC_MULTU    = OPC_SPECIAL | 0x19,

    OPC_DIV      = OPC_SPECIAL | 0x1A,

    OPC_DIVU     = OPC_SPECIAL | 0x1B,

    OPC_ADDU     = OPC_SPECIAL | 0x21,

    OPC_SUBU     = OPC_SPECIAL | 0x23,

    OPC_AND      = OPC_SPECIAL | 0x24,

    OPC_OR       = OPC_SPECIAL | 0x25,

    OPC_XOR      = OPC_SPECIAL | 0x26,

    OPC_NOR      = OPC_SPECIAL | 0x27,

    OPC_SLT      = OPC_SPECIAL | 0x2A,

    OPC_SLTU     = OPC_SPECIAL | 0x2B,

};

/*

 * Type reg

 */

static inline void tcg_out_opc_reg(TCGContext *s, int opc, int rd, int rs, int rt)

{

    int32_t inst;

    inst = opc;

    inst |= (rs & 0x1F) << 21;

    inst |= (rt & 0x1F) << 16;

    inst |= (rd & 0x1F) << 11;

    tcg_out32(s, inst);

}

/*

 * Type immediate

 */

static inline void tcg_out_opc_imm(TCGContext *s, int opc, int rt, int rs, int imm)

{

    int32_t inst;

    inst = opc;

    inst |= (rs & 0x1F) << 21;

    inst |= (rt & 0x1F) << 16;

    inst |= (imm & 0xffff);

    tcg_out32(s, inst);

}

/*

 * Type sa

 */

static inline void tcg_out_opc_sa(TCGContext *s, int opc, int rd, int rt, int sa)

{

    int32_t inst;

    inst = opc;

    inst |= (rt & 0x1F) << 16;

    inst |= (rd & 0x1F) << 11;

    inst |= (sa & 0x1F) <<  6;

    tcg_out32(s, inst);

}

static inline void tcg_out_nop(TCGContext *s)

{

    tcg_out32(s, 0);

}

static inline void tcg_out_mov(TCGContext *s, int ret, int arg)

{

    tcg_out_opc_reg(s, OPC_ADDU, ret, arg, TCG_REG_ZERO);

}

static inline void tcg_out_movi(TCGContext *s, TCGType type,

                                int reg, int32_t arg)

{

    if (arg == (int16_t)arg) {

        tcg_out_opc_imm(s, OPC_ADDIU, reg, TCG_REG_ZERO, arg);

    } else if (arg == (uint16_t)arg) {

        tcg_out_opc_imm(s, OPC_ORI, reg, TCG_REG_ZERO, arg);

    } else {

        tcg_out_opc_imm(s, OPC_LUI, reg, 0, arg >> 16);

        tcg_out_opc_imm(s, OPC_ORI, reg, reg, arg & 0xffff);

    }

}

static inline void tcg_out_bswap16(TCGContext *s, int ret, int arg)

{

    /* ret and arg can't be register at */

    if (ret == TCG_REG_AT || arg == TCG_REG_AT) {

        tcg_abort();

    }

    tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, arg, 8);

    tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_AT, TCG_REG_AT, 0x00ff);

    tcg_out_opc_sa(s, OPC_SLL, ret, arg, 8);

    tcg_out_opc_imm(s, OPC_ANDI, ret, ret, 0xff00);

    tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT);

}

static inline void tcg_out_bswap16s(TCGContext *s, int ret, int arg)

{

    /* ret and arg can't be register at */

    if (ret == TCG_REG_AT || arg == TCG_REG_AT) {

        tcg_abort();

    }

    tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, arg, 8);

    tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_AT, TCG_REG_AT, 0xff);

    tcg_out_opc_sa(s, OPC_SLL, ret, arg, 24);

    tcg_out_opc_sa(s, OPC_SRA, ret, ret, 16);

    tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT);

}

static inline void tcg_out_bswap32(TCGContext *s, int ret, int arg)

{

    /* ret and arg must be different and can't be register at */

    if (ret == arg || ret == TCG_REG_AT || arg == TCG_REG_AT) {

        tcg_abort();

    }

    tcg_out_opc_sa(s, OPC_SLL, ret, arg, 24);

    tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, arg, 24);

    tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT);

    tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_AT, arg, 0xff00);

    tcg_out_opc_sa(s, OPC_SLL, TCG_REG_AT, TCG_REG_AT, 8);

    tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT);

    tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, arg, 8);

    tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_AT, TCG_REG_AT, 0xff00);

    tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT);

}

static inline void tcg_out_ldst(TCGContext *s, int opc, int arg,

                              int arg1, tcg_target_long arg2)

{

    if (arg2 == (int16_t) arg2) {

        tcg_out_opc_imm(s, opc, arg, arg1, arg2);

    } else {

        tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_AT, arg2);

        tcg_out_opc_reg(s, OPC_ADDU, TCG_REG_AT, TCG_REG_AT, arg1);

        tcg_out_opc_imm(s, opc, arg, TCG_REG_AT, 0);

    }

}

static inline void tcg_out_ld(TCGContext *s, TCGType type, int arg,

                              int arg1, tcg_target_long arg2)

{

    tcg_out_ldst(s, OPC_LW, arg, arg1, arg2);

}

static inline void tcg_out_st(TCGContext *s, TCGType type, int arg,

                              int arg1, tcg_target_long arg2)

{

    tcg_out_ldst(s, OPC_SW, arg, arg1, arg2);

}

static inline void tcg_out_addi(TCGContext *s, int reg, tcg_target_long val)

{

    if (val == (int16_t)val) {

        tcg_out_opc_imm(s, OPC_ADDIU, reg, reg, val);

    } else {

        tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_AT, val);

        tcg_out_opc_reg(s, OPC_ADDU, reg, reg, TCG_REG_AT);

    }

}

static void tcg_out_brcond(TCGContext *s, TCGCond cond, int arg1,

                           int arg2, int label_index)

{

    TCGLabel *l = &s->labels[label_index];

    switch (cond) {

    case TCG_COND_EQ:

        tcg_out_opc_imm(s, OPC_BEQ, arg1, arg2, 0);

        break;

    case TCG_COND_NE:

        tcg_out_opc_imm(s, OPC_BNE, arg1, arg2, 0);

        break;

    case TCG_COND_LT:

        tcg_out_opc_reg(s, OPC_SLT, TCG_REG_AT, arg1, arg2);

        tcg_out_opc_imm(s, OPC_BNE, TCG_REG_AT, TCG_REG_ZERO, 0);

        break;

    case TCG_COND_LTU:

        tcg_out_opc_reg(s, OPC_SLTU, TCG_REG_AT, arg1, arg2);

        tcg_out_opc_imm(s, OPC_BNE, TCG_REG_AT, TCG_REG_ZERO, 0);

        break;

    case TCG_COND_GE:

        tcg_out_opc_reg(s, OPC_SLT, TCG_REG_AT, arg1, arg2);

        tcg_out_opc_imm(s, OPC_BEQ, TCG_REG_AT, TCG_REG_ZERO, 0);

        break;

    case TCG_COND_GEU:

        tcg_out_opc_reg(s, OPC_SLTU, TCG_REG_AT, arg1, arg2);

        tcg_out_opc_imm(s, OPC_BEQ, TCG_REG_AT, TCG_REG_ZERO, 0);

        break;

    case TCG_COND_LE:

        tcg_out_opc_reg(s, OPC_SLT, TCG_REG_AT, arg2, arg1);

        tcg_out_opc_imm(s, OPC_BEQ, TCG_REG_AT, TCG_REG_ZERO, 0);

        break;

    case TCG_COND_LEU:

        tcg_out_opc_reg(s, OPC_SLTU, TCG_REG_AT, arg2, arg1);

        tcg_out_opc_imm(s, OPC_BEQ, TCG_REG_AT, TCG_REG_ZERO, 0);

        break;

    case TCG_COND_GT:

        tcg_out_opc_reg(s, OPC_SLT, TCG_REG_AT, arg2, arg1);

        tcg_out_opc_imm(s, OPC_BNE, TCG_REG_AT, TCG_REG_ZERO, 0);

        break;

    case TCG_COND_GTU:

        tcg_out_opc_reg(s, OPC_SLTU, TCG_REG_AT, arg2, arg1);

        tcg_out_opc_imm(s, OPC_BNE, TCG_REG_AT, TCG_REG_ZERO, 0);

        break;

    default:

        tcg_abort();

        break;

    }

    if (l->has_value) {

        reloc_pc16(s->code_ptr - 4, l->u.value);

    } else {

        tcg_out_reloc(s, s->code_ptr - 4, R_MIPS_PC16, label_index, 0);

    }

    tcg_out_nop(s);

}

/* XXX: we implement it at the target level to avoid having to

   handle cross basic blocks temporaries */

static void tcg_out_brcond2(TCGContext *s, TCGCond cond, int arg1,

                            int arg2, int arg3, int arg4, int label_index)

{

    void *label_ptr;

    switch(cond) {

    case TCG_COND_NE:

        tcg_out_brcond(s, TCG_COND_NE, arg2, arg4, label_index);

        tcg_out_brcond(s, TCG_COND_NE, arg1, arg3, label_index);

        return;

    case TCG_COND_EQ:

        break;

    case TCG_COND_LT:

    case TCG_COND_LE:

        tcg_out_brcond(s, TCG_COND_LT, arg2, arg4, label_index);

        break;

    case TCG_COND_GT:

    case TCG_COND_GE:

        tcg_out_brcond(s, TCG_COND_GT, arg2, arg4, label_index);

        break;

    case TCG_COND_LTU:

    case TCG_COND_LEU:

        tcg_out_brcond(s, TCG_COND_LTU, arg2, arg4, label_index);

        break;

    case TCG_COND_GTU:

    case TCG_COND_GEU:

        tcg_out_brcond(s, TCG_COND_GTU, arg2, arg4, label_index);

        break;

    default:

        tcg_abort();

    }

    label_ptr = s->code_ptr;

    tcg_out_opc_imm(s, OPC_BNE, arg2, arg4, 0);

    tcg_out_nop(s);

    switch(cond) {

    case TCG_COND_EQ:

        tcg_out_brcond(s, TCG_COND_EQ, arg1, arg3, label_index);

        break;

    case TCG_COND_LT:

    case TCG_COND_LTU:

        tcg_out_brcond(s, TCG_COND_LTU, arg1, arg3, label_index);

        break;

    case TCG_COND_LE:

    case TCG_COND_LEU:

        tcg_out_brcond(s, TCG_COND_LEU, arg1, arg3, label_index);

        break;

    case TCG_COND_GT:

    case TCG_COND_GTU:

        tcg_out_brcond(s, TCG_COND_GTU, arg1, arg3, label_index);

        break;

    case TCG_COND_GE:

    case TCG_COND_GEU:

        tcg_out_brcond(s, TCG_COND_GEU, arg1, arg3, label_index);

        break;

    default:

        tcg_abort();

    }

    reloc_pc16(label_ptr, (tcg_target_long) s->code_ptr);

}

static void tcg_out_setcond(TCGContext *s, TCGCond cond, int ret,

                            int arg1, int arg2)

{

    switch (cond) {

    case TCG_COND_EQ:

        if (arg1 == 0) {

            tcg_out_opc_imm(s, OPC_SLTIU, ret, arg2, 1);

        } else if (arg2 == 0) {

            tcg_out_opc_imm(s, OPC_SLTIU, ret, arg1, 1);

        } else {

            tcg_out_opc_reg(s, OPC_XOR, ret, arg1, arg2);

            tcg_out_opc_imm(s, OPC_SLTIU, ret, ret, 1);

        }

        break;

    case TCG_COND_NE:

        if (arg1 == 0) {

            tcg_out_opc_reg(s, OPC_SLTU, ret, TCG_REG_ZERO, arg2);

        } else if (arg2 == 0) {

            tcg_out_opc_reg(s, OPC_SLTU, ret, TCG_REG_ZERO, arg1);

        } else {

            tcg_out_opc_reg(s, OPC_XOR, ret, arg1, arg2);

            tcg_out_opc_reg(s, OPC_SLTU, ret, TCG_REG_ZERO, ret);

        }

        break;

    case TCG_COND_LT:

        tcg_out_opc_reg(s, OPC_SLT, ret, arg1, arg2);

        break;

    case TCG_COND_LTU:

        tcg_out_opc_reg(s, OPC_SLTU, ret, arg1, arg2);

        break;

    case TCG_COND_GE:

        tcg_out_opc_reg(s, OPC_SLT, ret, arg1, arg2);

        tcg_out_opc_imm(s, OPC_XORI, ret, ret, 1);

        break;

    case TCG_COND_GEU:

        tcg_out_opc_reg(s, OPC_SLTU, ret, arg1, arg2);

        tcg_out_opc_imm(s, OPC_XORI, ret, ret, 1);

        break;

    case TCG_COND_LE:

        tcg_out_opc_reg(s, OPC_SLT, ret, arg2, arg1);

        tcg_out_opc_imm(s, OPC_XORI, ret, ret, 1);

        break;

    case TCG_COND_LEU:

        tcg_out_opc_reg(s, OPC_SLTU, ret, arg2, arg1);

        tcg_out_opc_imm(s, OPC_XORI, ret, ret, 1);

        break;

    case TCG_COND_GT:

        tcg_out_opc_reg(s, OPC_SLT, ret, arg2, arg1);

        break;

    case TCG_COND_GTU:

        tcg_out_opc_reg(s, OPC_SLTU, ret, arg2, arg1);

        break;

    default:

        tcg_abort();

        break;

    }

}

/* XXX: we implement it at the target level to avoid having to

   handle cross basic blocks temporaries */

static void tcg_out_setcond2(TCGContext *s, TCGCond cond, int ret,

                             int arg1, int arg2, int arg3, int arg4)

{

    switch (cond) {

    case TCG_COND_EQ:

        tcg_out_setcond(s, TCG_COND_EQ, TCG_REG_AT, arg2, arg4);

        tcg_out_setcond(s, TCG_COND_EQ, TCG_REG_T0, arg1, arg3);

        tcg_out_opc_reg(s, OPC_AND, ret, TCG_REG_AT, TCG_REG_T0);

        return;

    case TCG_COND_NE:

        tcg_out_setcond(s, TCG_COND_NE, TCG_REG_AT, arg2, arg4);

        tcg_out_setcond(s, TCG_COND_NE, TCG_REG_T0, arg1, arg3);

        tcg_out_opc_reg(s, OPC_OR, ret, TCG_REG_AT, TCG_REG_T0);

        return;

    case TCG_COND_LT:

    case TCG_COND_LE:

        tcg_out_setcond(s, TCG_COND_LT, TCG_REG_AT, arg2, arg4);

        break;

    case TCG_COND_GT:

    case TCG_COND_GE:

        tcg_out_setcond(s, TCG_COND_GT, TCG_REG_AT, arg2, arg4);

        break;

    case TCG_COND_LTU:

    case TCG_COND_LEU:

        tcg_out_setcond(s, TCG_COND_LTU, TCG_REG_AT, arg2, arg4);

        break;

    case TCG_COND_GTU:

    case TCG_COND_GEU:

        tcg_out_setcond(s, TCG_COND_GTU, TCG_REG_AT, arg2, arg4);

        break;

    default:

        tcg_abort();

        break;

    }

    tcg_out_setcond(s, TCG_COND_EQ, TCG_REG_T0, arg2, arg4);

    switch(cond) {

    case TCG_COND_LT:

    case TCG_COND_LTU:

        tcg_out_setcond(s, TCG_COND_LTU, ret, arg1, arg3);

        break;

    case TCG_COND_LE:

    case TCG_COND_LEU:

        tcg_out_setcond(s, TCG_COND_LEU, ret, arg1, arg3);

        break;

    case TCG_COND_GT:

    case TCG_COND_GTU:

        tcg_out_setcond(s, TCG_COND_GTU, ret, arg1, arg3);

        break;

    case TCG_COND_GE:

    case TCG_COND_GEU:

        tcg_out_setcond(s, TCG_COND_GEU, ret, arg1, arg3);

        break;

    default:

        tcg_abort();

    }

    tcg_out_opc_reg(s, OPC_AND, ret, ret, TCG_REG_T0);

    tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT);

}

#if defined(CONFIG_SOFTMMU)

#include "../../softmmu_defs.h"

static void *qemu_ld_helpers[4] = {

    __ldb_mmu,

    __ldw_mmu,

    __ldl_mmu,

    __ldq_mmu,

};

static void *qemu_st_helpers[4] = {

    __stb_mmu,

    __stw_mmu,

    __stl_mmu,

    __stq_mmu,

};

#endif

static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,

                            int opc)

{

    int addr_regl, addr_reg1, addr_meml;

    int data_regl, data_regh, data_reg1, data_reg2;

    int mem_index, s_bits;

#if defined(CONFIG_SOFTMMU)

    void *label1_ptr, *label2_ptr;

    int sp_args;

#endif

#if TARGET_LONG_BITS == 64

# if defined(CONFIG_SOFTMMU)

    uint8_t *label3_ptr;

# endif

    int addr_regh, addr_reg2, addr_memh;

#endif

    data_regl = *args++;

    if (opc == 3)

        data_regh = *args++;

    else

        data_regh = 0;

    addr_regl = *args++;

#if TARGET_LONG_BITS == 64

    addr_regh = *args++;

#endif

    mem_index = *args;

    s_bits = opc & 3;

    if (opc == 3) {

#if defined(TCG_TARGET_WORDS_BIGENDIAN)

        data_reg1 = data_regh;

        data_reg2 = data_regl;

#else

        data_reg1 = data_regl;

        data_reg2 = data_regh;

#endif

    } else {

        data_reg1 = data_regl;

        data_reg2 = 0;

    }

#if TARGET_LONG_BITS == 64

# if defined(TCG_TARGET_WORDS_BIGENDIAN)

    addr_reg1 = addr_regh;

    addr_reg2 = addr_regl;

    addr_memh = 0;

    addr_meml = 4;

# else

    addr_reg1 = addr_regl;

    addr_reg2 = addr_regh;

    addr_memh = 4;

    addr_meml = 0;

# endif

#else

    addr_reg1 = addr_regl;

    addr_meml = 0;

#endif

#if defined(CONFIG_SOFTMMU)

    tcg_out_opc_sa(s, OPC_SRL, TCG_REG_A0, addr_regl, TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS);

    tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_A0, TCG_REG_A0, (CPU_TLB_SIZE - 1) << CPU_TLB_ENTRY_BITS);

    tcg_out_opc_reg(s, OPC_ADDU, TCG_REG_A0, TCG_REG_A0, TCG_AREG0);

    tcg_out_opc_imm(s, OPC_LW, TCG_REG_AT, TCG_REG_A0,

                    offsetof(CPUState, tlb_table[mem_index][0].addr_read) + addr_meml);

    tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_T0, TARGET_PAGE_MASK | ((1 << s_bits) - 1));

    tcg_out_opc_reg(s, OPC_AND, TCG_REG_T0, TCG_REG_T0, addr_regl);

# if TARGET_LONG_BITS == 64

    label3_ptr = s->code_ptr;

    tcg_out_opc_imm(s, OPC_BNE, TCG_REG_T0, TCG_REG_AT, 0);

    tcg_out_nop(s);

    tcg_out_opc_imm(s, OPC_LW, TCG_REG_AT, TCG_REG_A0,

                    offsetof(CPUState, tlb_table[mem_index][0].addr_read) + addr_memh);

    label1_ptr = s->code_ptr;

    tcg_out_opc_imm(s, OPC_BEQ, addr_regh, TCG_REG_AT, 0);

    tcg_out_nop(s);

    reloc_pc16(label3_ptr, (tcg_target_long) s->code_ptr);

# else

    label1_ptr = s->code_ptr;

    tcg_out_opc_imm(s, OPC_BEQ, TCG_REG_T0, TCG_REG_AT, 0);

    tcg_out_nop(s);

# endif

    /* slow path */

    sp_args = TCG_REG_A0;

    tcg_out_mov(s, sp_args++, addr_reg1);

# if TARGET_LONG_BITS == 64

    tcg_out_mov(s, sp_args++, addr_reg2);

# endif

    tcg_out_movi(s, TCG_TYPE_I32, sp_args++, mem_index);

    tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_T9, (tcg_target_long)qemu_ld_helpers[s_bits]);

    tcg_out_opc_reg(s, OPC_JALR, TCG_REG_RA, TCG_REG_T9, 0);

    tcg_out_nop(s);

    switch(opc) {

    case 0:

        tcg_out_opc_imm(s, OPC_ANDI, data_reg1, TCG_REG_V0, 0xff);

        break;

    case 0 | 4:

        tcg_out_opc_sa(s, OPC_SLL, TCG_REG_V0, TCG_REG_V0, 24);

        tcg_out_opc_sa(s, OPC_SRA, data_reg1, TCG_REG_V0, 24);

        break;

    case 1:

        tcg_out_opc_imm(s, OPC_ANDI, data_reg1, TCG_REG_V0, 0xffff);

        break;

    case 1 | 4:

        tcg_out_opc_sa(s, OPC_SLL, TCG_REG_V0, TCG_REG_V0, 16);

        tcg_out_opc_sa(s, OPC_SRA, data_reg1, TCG_REG_V0, 16);

        break;

    case 2:

        tcg_out_mov(s, data_reg1, TCG_REG_V0);

        break;

    case 3:

        tcg_out_mov(s, data_reg2, TCG_REG_V1);

        tcg_out_mov(s, data_reg1, TCG_REG_V0);

        break;

    default:

        tcg_abort();

    }

    label2_ptr = s->code_ptr;

    tcg_out_opc_imm(s, OPC_BEQ, TCG_REG_ZERO, TCG_REG_ZERO, 0);

    tcg_out_nop(s);

    /* label1: fast path */

    reloc_pc16(label1_ptr, (tcg_target_long) s->code_ptr);

    tcg_out_opc_imm(s, OPC_LW, TCG_REG_A0, TCG_REG_A0,

                    offsetof(CPUState, tlb_table[mem_index][0].addend) + addr_meml);

    tcg_out_opc_reg(s, OPC_ADDU, TCG_REG_V0, TCG_REG_A0, addr_regl);

    addr_reg1 = TCG_REG_V0;

#endif

    switch(opc) {

    case 0:

        tcg_out_opc_imm(s, OPC_LBU, data_reg1, addr_reg1, 0);

        break;

    case 0 | 4:

        tcg_out_opc_imm(s, OPC_LB, data_reg1, addr_reg1, 0);

        break;

    case 1:

        if (TCG_NEED_BSWAP) {

            tcg_out_opc_imm(s, OPC_LHU, TCG_REG_T0, addr_reg1, 0);

            tcg_out_bswap16(s, data_reg1, TCG_REG_T0);

        } else {

            tcg_out_opc_imm(s, OPC_LHU, data_reg1, addr_reg1, 0);

        }

        break;

    case 1 | 4:

        if (TCG_NEED_BSWAP) {

            tcg_out_opc_imm(s, OPC_LHU, TCG_REG_T0, addr_reg1, 0);

            tcg_out_bswap16s(s, data_reg1, TCG_REG_T0);

        } else {

            tcg_out_opc_imm(s, OPC_LH, data_reg1, addr_reg1, 0);

        }

        break;

    case 2: