translate.c

/*
 *  MIPS32 emulation for qemu: main translation routines.
 *
 *  Copyright (c) 2004-2005 Jocelyn Mayer
 *  Copyright (c) 2006 Marius Groeger (FPU operations)
 *  Copyright (c) 2006 Thiemo Seufer (MIPS32R2 support)
 *  Copyright (c) 2009 CodeSourcery (MIPS16 and microMIPS support)
 *
 * 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 "cpu.h"
#include "exec-all.h"
#include "disas.h"
#include "tcg-op.h"
#include "qemu-common.h"

#include "helper.h"
#define GEN_HELPER 1
#include "helper.h"

//#define MIPS_DEBUG_DISAS
//#define MIPS_DEBUG_SIGN_EXTENSIONS

/* MIPS major opcodes */
#define MASK_OP_MAJOR(op)  (op & (0x3F << 26))

enum {
    /* indirect opcode tables */
    OPC_SPECIAL  = (0x00 << 26),
    OPC_REGIMM   = (0x01 << 26),
    OPC_CP0      = (0x10 << 26),
    OPC_CP1      = (0x11 << 26),
    OPC_CP2      = (0x12 << 26),
    OPC_CP3      = (0x13 << 26),
    OPC_SPECIAL2 = (0x1C << 26),
    OPC_SPECIAL3 = (0x1F << 26),
    /* arithmetic with immediate */
    OPC_ADDI     = (0x08 << 26),
    OPC_ADDIU    = (0x09 << 26),
    OPC_SLTI     = (0x0A << 26),
    OPC_SLTIU    = (0x0B << 26),
    /* logic with immediate */
    OPC_ANDI     = (0x0C << 26),
    OPC_ORI      = (0x0D << 26),
    OPC_XORI     = (0x0E << 26),
    OPC_LUI      = (0x0F << 26),
    /* arithmetic with immediate */
    OPC_DADDI    = (0x18 << 26),
    OPC_DADDIU   = (0x19 << 26),
    /* Jump and branches */
    OPC_J        = (0x02 << 26),
    OPC_JAL      = (0x03 << 26),
    OPC_JALS     = OPC_JAL | 0x5,
    OPC_BEQ      = (0x04 << 26),  /* Unconditional if rs = rt = 0 (B) */
    OPC_BEQL     = (0x14 << 26),
    OPC_BNE      = (0x05 << 26),
    OPC_BNEL     = (0x15 << 26),
    OPC_BLEZ     = (0x06 << 26),
    OPC_BLEZL    = (0x16 << 26),
    OPC_BGTZ     = (0x07 << 26),
    OPC_BGTZL    = (0x17 << 26),
    OPC_JALX     = (0x1D << 26),  /* MIPS 16 only */
    OPC_JALXS    = OPC_JALX | 0x5,
    /* Load and stores */
    OPC_LDL      = (0x1A << 26),
    OPC_LDR      = (0x1B << 26),
    OPC_LB       = (0x20 << 26),
    OPC_LH       = (0x21 << 26),
    OPC_LWL      = (0x22 << 26),
    OPC_LW       = (0x23 << 26),
    OPC_LWPC     = OPC_LW | 0x5,
    OPC_LBU      = (0x24 << 26),
    OPC_LHU      = (0x25 << 26),
    OPC_LWR      = (0x26 << 26),
    OPC_LWU      = (0x27 << 26),
    OPC_SB       = (0x28 << 26),
    OPC_SH       = (0x29 << 26),
    OPC_SWL      = (0x2A << 26),
    OPC_SW       = (0x2B << 26),
    OPC_SDL      = (0x2C << 26),
    OPC_SDR      = (0x2D << 26),
    OPC_SWR      = (0x2E << 26),
    OPC_LL       = (0x30 << 26),
    OPC_LLD      = (0x34 << 26),
    OPC_LD       = (0x37 << 26),
    OPC_LDPC     = OPC_LD | 0x5,
    OPC_SC       = (0x38 << 26),
    OPC_SCD      = (0x3C << 26),
    OPC_SD       = (0x3F << 26),
    /* Floating point load/store */
    OPC_LWC1     = (0x31 << 26),
    OPC_LWC2     = (0x32 << 26),
    OPC_LDC1     = (0x35 << 26),
    OPC_LDC2     = (0x36 << 26),
    OPC_SWC1     = (0x39 << 26),
    OPC_SWC2     = (0x3A << 26),
    OPC_SDC1     = (0x3D << 26),
    OPC_SDC2     = (0x3E << 26),
    /* MDMX ASE specific */
    OPC_MDMX     = (0x1E << 26),
    /* Cache and prefetch */
    OPC_CACHE    = (0x2F << 26),
    OPC_PREF     = (0x33 << 26),
    /* Reserved major opcode */
    OPC_MAJOR3B_RESERVED = (0x3B << 26),
};

/* MIPS special opcodes */
#define MASK_SPECIAL(op)   MASK_OP_MAJOR(op) | (op & 0x3F)

enum {
    /* Shifts */
    OPC_SLL      = 0x00 | OPC_SPECIAL,
    /* NOP is SLL r0, r0, 0   */
    /* SSNOP is SLL r0, r0, 1 */
    /* EHB is SLL r0, r0, 3 */
    OPC_SRL      = 0x02 | OPC_SPECIAL, /* also ROTR */
    OPC_ROTR     = OPC_SRL | (1 << 21),
    OPC_SRA      = 0x03 | OPC_SPECIAL,
    OPC_SLLV     = 0x04 | OPC_SPECIAL,
    OPC_SRLV     = 0x06 | OPC_SPECIAL, /* also ROTRV */
    OPC_ROTRV    = OPC_SRLV | (1 << 6),
    OPC_SRAV     = 0x07 | OPC_SPECIAL,
    OPC_DSLLV    = 0x14 | OPC_SPECIAL,
    OPC_DSRLV    = 0x16 | OPC_SPECIAL, /* also DROTRV */
    OPC_DROTRV   = OPC_DSRLV | (1 << 6),
    OPC_DSRAV    = 0x17 | OPC_SPECIAL,
    OPC_DSLL     = 0x38 | OPC_SPECIAL,
    OPC_DSRL     = 0x3A | OPC_SPECIAL, /* also DROTR */
    OPC_DROTR    = OPC_DSRL | (1 << 21),
    OPC_DSRA     = 0x3B | OPC_SPECIAL,
    OPC_DSLL32   = 0x3C | OPC_SPECIAL,
    OPC_DSRL32   = 0x3E | OPC_SPECIAL, /* also DROTR32 */
    OPC_DROTR32  = OPC_DSRL32 | (1 << 21),
    OPC_DSRA32   = 0x3F | OPC_SPECIAL,
    /* Multiplication / division */
    OPC_MULT     = 0x18 | OPC_SPECIAL,
    OPC_MULTU    = 0x19 | OPC_SPECIAL,
    OPC_DIV      = 0x1A | OPC_SPECIAL,
    OPC_DIVU     = 0x1B | OPC_SPECIAL,
    OPC_DMULT    = 0x1C | OPC_SPECIAL,
    OPC_DMULTU   = 0x1D | OPC_SPECIAL,
    OPC_DDIV     = 0x1E | OPC_SPECIAL,
    OPC_DDIVU    = 0x1F | OPC_SPECIAL,
    /* 2 registers arithmetic / logic */
    OPC_ADD      = 0x20 | OPC_SPECIAL,
    OPC_ADDU     = 0x21 | OPC_SPECIAL,
    OPC_SUB      = 0x22 | OPC_SPECIAL,
    OPC_SUBU     = 0x23 | OPC_SPECIAL,
    OPC_AND      = 0x24 | OPC_SPECIAL,
    OPC_OR       = 0x25 | OPC_SPECIAL,
    OPC_XOR      = 0x26 | OPC_SPECIAL,
    OPC_NOR      = 0x27 | OPC_SPECIAL,
    OPC_SLT      = 0x2A | OPC_SPECIAL,
    OPC_SLTU     = 0x2B | OPC_SPECIAL,
    OPC_DADD     = 0x2C | OPC_SPECIAL,
    OPC_DADDU    = 0x2D | OPC_SPECIAL,
    OPC_DSUB     = 0x2E | OPC_SPECIAL,
    OPC_DSUBU    = 0x2F | OPC_SPECIAL,
    /* Jumps */
    OPC_JR       = 0x08 | OPC_SPECIAL, /* Also JR.HB */
    OPC_JALR     = 0x09 | OPC_SPECIAL, /* Also JALR.HB */
    OPC_JALRC    = OPC_JALR | (0x5 << 6),
    OPC_JALRS    = 0x10 | OPC_SPECIAL | (0x5 << 6),
    /* Traps */
    OPC_TGE      = 0x30 | OPC_SPECIAL,
    OPC_TGEU     = 0x31 | OPC_SPECIAL,
    OPC_TLT      = 0x32 | OPC_SPECIAL,
    OPC_TLTU     = 0x33 | OPC_SPECIAL,
    OPC_TEQ      = 0x34 | OPC_SPECIAL,
    OPC_TNE      = 0x36 | OPC_SPECIAL,
    /* HI / LO registers load & stores */
    OPC_MFHI     = 0x10 | OPC_SPECIAL,
    OPC_MTHI     = 0x11 | OPC_SPECIAL,
    OPC_MFLO     = 0x12 | OPC_SPECIAL,
    OPC_MTLO     = 0x13 | OPC_SPECIAL,
    /* Conditional moves */
    OPC_MOVZ     = 0x0A | OPC_SPECIAL,
    OPC_MOVN     = 0x0B | OPC_SPECIAL,

    OPC_MOVCI    = 0x01 | OPC_SPECIAL,

    /* Special */
    OPC_PMON     = 0x05 | OPC_SPECIAL, /* unofficial */
    OPC_SYSCALL  = 0x0C | OPC_SPECIAL,
    OPC_BREAK    = 0x0D | OPC_SPECIAL,
    OPC_SPIM     = 0x0E | OPC_SPECIAL, /* unofficial */
    OPC_SYNC     = 0x0F | OPC_SPECIAL,

    OPC_SPECIAL15_RESERVED = 0x15 | OPC_SPECIAL,
    OPC_SPECIAL28_RESERVED = 0x28 | OPC_SPECIAL,
    OPC_SPECIAL29_RESERVED = 0x29 | OPC_SPECIAL,
    OPC_SPECIAL35_RESERVED = 0x35 | OPC_SPECIAL,
    OPC_SPECIAL37_RESERVED = 0x37 | OPC_SPECIAL,
    OPC_SPECIAL39_RESERVED = 0x39 | OPC_SPECIAL,
    OPC_SPECIAL3D_RESERVED = 0x3D | OPC_SPECIAL,
};

/* Multiplication variants of the vr54xx. */
#define MASK_MUL_VR54XX(op)   MASK_SPECIAL(op) | (op & (0x1F << 6))

enum {
    OPC_VR54XX_MULS    = (0x03 << 6) | OPC_MULT,
    OPC_VR54XX_MULSU   = (0x03 << 6) | OPC_MULTU,
    OPC_VR54XX_MACC    = (0x05 << 6) | OPC_MULT,
    OPC_VR54XX_MACCU   = (0x05 << 6) | OPC_MULTU,
    OPC_VR54XX_MSAC    = (0x07 << 6) | OPC_MULT,
    OPC_VR54XX_MSACU   = (0x07 << 6) | OPC_MULTU,
    OPC_VR54XX_MULHI   = (0x09 << 6) | OPC_MULT,
    OPC_VR54XX_MULHIU  = (0x09 << 6) | OPC_MULTU,
    OPC_VR54XX_MULSHI  = (0x0B << 6) | OPC_MULT,
    OPC_VR54XX_MULSHIU = (0x0B << 6) | OPC_MULTU,
    OPC_VR54XX_MACCHI  = (0x0D << 6) | OPC_MULT,
    OPC_VR54XX_MACCHIU = (0x0D << 6) | OPC_MULTU,
    OPC_VR54XX_MSACHI  = (0x0F << 6) | OPC_MULT,
    OPC_VR54XX_MSACHIU = (0x0F << 6) | OPC_MULTU,
};

/* REGIMM (rt field) opcodes */
#define MASK_REGIMM(op)    MASK_OP_MAJOR(op) | (op & (0x1F << 16))

enum {
    OPC_BLTZ     = (0x00 << 16) | OPC_REGIMM,
    OPC_BLTZL    = (0x02 << 16) | OPC_REGIMM,
    OPC_BGEZ     = (0x01 << 16) | OPC_REGIMM,
    OPC_BGEZL    = (0x03 << 16) | OPC_REGIMM,
    OPC_BLTZAL   = (0x10 << 16) | OPC_REGIMM,
    OPC_BLTZALS  = OPC_BLTZAL | 0x5, /* microMIPS */
    OPC_BLTZALL  = (0x12 << 16) | OPC_REGIMM,
    OPC_BGEZAL   = (0x11 << 16) | OPC_REGIMM,
    OPC_BGEZALS  = OPC_BGEZAL | 0x5, /* microMIPS */
    OPC_BGEZALL  = (0x13 << 16) | OPC_REGIMM,
    OPC_TGEI     = (0x08 << 16) | OPC_REGIMM,
    OPC_TGEIU    = (0x09 << 16) | OPC_REGIMM,
    OPC_TLTI     = (0x0A << 16) | OPC_REGIMM,
    OPC_TLTIU    = (0x0B << 16) | OPC_REGIMM,
    OPC_TEQI     = (0x0C << 16) | OPC_REGIMM,
    OPC_TNEI     = (0x0E << 16) | OPC_REGIMM,
    OPC_SYNCI    = (0x1F << 16) | OPC_REGIMM,
};

/* Special2 opcodes */
#define MASK_SPECIAL2(op)  MASK_OP_MAJOR(op) | (op & 0x3F)

enum {
    /* Multiply & xxx operations */
    OPC_MADD     = 0x00 | OPC_SPECIAL2,
    OPC_MADDU    = 0x01 | OPC_SPECIAL2,
    OPC_MUL      = 0x02 | OPC_SPECIAL2,
    OPC_MSUB     = 0x04 | OPC_SPECIAL2,
    OPC_MSUBU    = 0x05 | OPC_SPECIAL2,
    /* Misc */
    OPC_CLZ      = 0x20 | OPC_SPECIAL2,
    OPC_CLO      = 0x21 | OPC_SPECIAL2,
    OPC_DCLZ     = 0x24 | OPC_SPECIAL2,
    OPC_DCLO     = 0x25 | OPC_SPECIAL2,
    /* Special */
    OPC_SDBBP    = 0x3F | OPC_SPECIAL2,
};

/* Special3 opcodes */
#define MASK_SPECIAL3(op)  MASK_OP_MAJOR(op) | (op & 0x3F)

enum {
    OPC_EXT      = 0x00 | OPC_SPECIAL3,
    OPC_DEXTM    = 0x01 | OPC_SPECIAL3,
    OPC_DEXTU    = 0x02 | OPC_SPECIAL3,
    OPC_DEXT     = 0x03 | OPC_SPECIAL3,
    OPC_INS      = 0x04 | OPC_SPECIAL3,
    OPC_DINSM    = 0x05 | OPC_SPECIAL3,
    OPC_DINSU    = 0x06 | OPC_SPECIAL3,
    OPC_DINS     = 0x07 | OPC_SPECIAL3,
    OPC_FORK     = 0x08 | OPC_SPECIAL3,
    OPC_YIELD    = 0x09 | OPC_SPECIAL3,
    OPC_BSHFL    = 0x20 | OPC_SPECIAL3,
    OPC_DBSHFL   = 0x24 | OPC_SPECIAL3,
    OPC_RDHWR    = 0x3B | OPC_SPECIAL3,
};

/* BSHFL opcodes */
#define MASK_BSHFL(op)     MASK_SPECIAL3(op) | (op & (0x1F << 6))

enum {
    OPC_WSBH     = (0x02 << 6) | OPC_BSHFL,
    OPC_SEB      = (0x10 << 6) | OPC_BSHFL,
    OPC_SEH      = (0x18 << 6) | OPC_BSHFL,
};

/* DBSHFL opcodes */
#define MASK_DBSHFL(op)    MASK_SPECIAL3(op) | (op & (0x1F << 6))

enum {
    OPC_DSBH     = (0x02 << 6) | OPC_DBSHFL,
    OPC_DSHD     = (0x05 << 6) | OPC_DBSHFL,
};

/* Coprocessor 0 (rs field) */
#define MASK_CP0(op)       MASK_OP_MAJOR(op) | (op & (0x1F << 21))

enum {
    OPC_MFC0     = (0x00 << 21) | OPC_CP0,
    OPC_DMFC0    = (0x01 << 21) | OPC_CP0,
    OPC_MTC0     = (0x04 << 21) | OPC_CP0,
    OPC_DMTC0    = (0x05 << 21) | OPC_CP0,
    OPC_MFTR     = (0x08 << 21) | OPC_CP0,
    OPC_RDPGPR   = (0x0A << 21) | OPC_CP0,
    OPC_MFMC0    = (0x0B << 21) | OPC_CP0,
    OPC_MTTR     = (0x0C << 21) | OPC_CP0,
    OPC_WRPGPR   = (0x0E << 21) | OPC_CP0,
    OPC_C0       = (0x10 << 21) | OPC_CP0,
    OPC_C0_FIRST = (0x10 << 21) | OPC_CP0,
    OPC_C0_LAST  = (0x1F << 21) | OPC_CP0,
};

/* MFMC0 opcodes */
#define MASK_MFMC0(op)     MASK_CP0(op) | (op & 0xFFFF)

enum {
    OPC_DMT      = 0x01 | (0 << 5) | (0x0F << 6) | (0x01 << 11) | OPC_MFMC0,
    OPC_EMT      = 0x01 | (1 << 5) | (0x0F << 6) | (0x01 << 11) | OPC_MFMC0,
    OPC_DVPE     = 0x01 | (0 << 5) | OPC_MFMC0,
    OPC_EVPE     = 0x01 | (1 << 5) | OPC_MFMC0,
    OPC_DI       = (0 << 5) | (0x0C << 11) | OPC_MFMC0,
    OPC_EI       = (1 << 5) | (0x0C << 11) | OPC_MFMC0,
};

/* Coprocessor 0 (with rs == C0) */
#define MASK_C0(op)        MASK_CP0(op) | (op & 0x3F)

enum {
    OPC_TLBR     = 0x01 | OPC_C0,
    OPC_TLBWI    = 0x02 | OPC_C0,
    OPC_TLBWR    = 0x06 | OPC_C0,
    OPC_TLBP     = 0x08 | OPC_C0,
    OPC_RFE      = 0x10 | OPC_C0,
    OPC_ERET     = 0x18 | OPC_C0,
    OPC_DERET    = 0x1F | OPC_C0,
    OPC_WAIT     = 0x20 | OPC_C0,
};

/* Coprocessor 1 (rs field) */
#define MASK_CP1(op)       MASK_OP_MAJOR(op) | (op & (0x1F << 21))

/* Values for the fmt field in FP instructions */
enum {
    /* 0 - 15 are reserved */
    FMT_S = 16,          /* single fp */
    FMT_D = 17,          /* double fp */
    FMT_E = 18,          /* extended fp */
    FMT_Q = 19,          /* quad fp */
    FMT_W = 20,          /* 32-bit fixed */
    FMT_L = 21,          /* 64-bit fixed */
    FMT_PS = 22,         /* paired single fp */
    /* 23 - 31 are reserved */
};

enum {
    OPC_MFC1     = (0x00 << 21) | OPC_CP1,
    OPC_DMFC1    = (0x01 << 21) | OPC_CP1,
    OPC_CFC1     = (0x02 << 21) | OPC_CP1,
    OPC_MFHC1    = (0x03 << 21) | OPC_CP1,
    OPC_MTC1     = (0x04 << 21) | OPC_CP1,
    OPC_DMTC1    = (0x05 << 21) | OPC_CP1,
    OPC_CTC1     = (0x06 << 21) | OPC_CP1,
    OPC_MTHC1    = (0x07 << 21) | OPC_CP1,
    OPC_BC1      = (0x08 << 21) | OPC_CP1, /* bc */
    OPC_BC1ANY2  = (0x09 << 21) | OPC_CP1,
    OPC_BC1ANY4  = (0x0A << 21) | OPC_CP1,
    OPC_S_FMT    = (FMT_S << 21) | OPC_CP1,
    OPC_D_FMT    = (FMT_D << 21) | OPC_CP1,
    OPC_E_FMT    = (FMT_E << 21) | OPC_CP1,
    OPC_Q_FMT    = (FMT_Q << 21) | OPC_CP1,
    OPC_W_FMT    = (FMT_W << 21) | OPC_CP1,
    OPC_L_FMT    = (FMT_L << 21) | OPC_CP1,
    OPC_PS_FMT   = (FMT_PS << 21) | OPC_CP1,
};

#define MASK_CP1_FUNC(op)       MASK_CP1(op) | (op & 0x3F)
#define MASK_BC1(op)            MASK_CP1(op) | (op & (0x3 << 16))

enum {
    OPC_BC1F     = (0x00 << 16) | OPC_BC1,
    OPC_BC1T     = (0x01 << 16) | OPC_BC1,
    OPC_BC1FL    = (0x02 << 16) | OPC_BC1,
    OPC_BC1TL    = (0x03 << 16) | OPC_BC1,
};

enum {
    OPC_BC1FANY2     = (0x00 << 16) | OPC_BC1ANY2,
    OPC_BC1TANY2     = (0x01 << 16) | OPC_BC1ANY2,
};

enum {
    OPC_BC1FANY4     = (0x00 << 16) | OPC_BC1ANY4,
    OPC_BC1TANY4     = (0x01 << 16) | OPC_BC1ANY4,
};

#define MASK_CP2(op)       MASK_OP_MAJOR(op) | (op & (0x1F << 21))

enum {
    OPC_MFC2    = (0x00 << 21) | OPC_CP2,
    OPC_DMFC2   = (0x01 << 21) | OPC_CP2,
    OPC_CFC2    = (0x02 << 21) | OPC_CP2,
    OPC_MFHC2   = (0x03 << 21) | OPC_CP2,
    OPC_MTC2    = (0x04 << 21) | OPC_CP2,
    OPC_DMTC2   = (0x05 << 21) | OPC_CP2,
    OPC_CTC2    = (0x06 << 21) | OPC_CP2,
    OPC_MTHC2   = (0x07 << 21) | OPC_CP2,
    OPC_BC2     = (0x08 << 21) | OPC_CP2,
};

#define MASK_CP3(op)       MASK_OP_MAJOR(op) | (op & 0x3F)

enum {
    OPC_LWXC1   = 0x00 | OPC_CP3,
    OPC_LDXC1   = 0x01 | OPC_CP3,
    OPC_LUXC1   = 0x05 | OPC_CP3,
    OPC_SWXC1   = 0x08 | OPC_CP3,
    OPC_SDXC1   = 0x09 | OPC_CP3,
    OPC_SUXC1   = 0x0D | OPC_CP3,
    OPC_PREFX   = 0x0F | OPC_CP3,
    OPC_ALNV_PS = 0x1E | OPC_CP3,
    OPC_MADD_S  = 0x20 | OPC_CP3,
    OPC_MADD_D  = 0x21 | OPC_CP3,
    OPC_MADD_PS = 0x26 | OPC_CP3,
    OPC_MSUB_S  = 0x28 | OPC_CP3,
    OPC_MSUB_D  = 0x29 | OPC_CP3,
    OPC_MSUB_PS = 0x2E | OPC_CP3,
    OPC_NMADD_S = 0x30 | OPC_CP3,
    OPC_NMADD_D = 0x31 | OPC_CP3,
    OPC_NMADD_PS= 0x36 | OPC_CP3,
    OPC_NMSUB_S = 0x38 | OPC_CP3,
    OPC_NMSUB_D = 0x39 | OPC_CP3,
    OPC_NMSUB_PS= 0x3E | OPC_CP3,
};

/* global register indices */
static TCGv_ptr cpu_env;
static TCGv cpu_gpr[32], cpu_PC;
static TCGv cpu_HI[MIPS_DSP_ACC], cpu_LO[MIPS_DSP_ACC], cpu_ACX[MIPS_DSP_ACC];
static TCGv cpu_dspctrl, btarget, bcond;
static TCGv_i32 hflags;
static TCGv_i32 fpu_fcr0, fpu_fcr31;

static uint32_t gen_opc_hflags[OPC_BUF_SIZE];

#include "gen-icount.h"

#define gen_helper_0i(name, arg) do {                             \
    TCGv_i32 helper_tmp = tcg_const_i32(arg);                     \
    gen_helper_##name(helper_tmp);                                \
    tcg_temp_free_i32(helper_tmp);                                \
    } while(0)

#define gen_helper_1i(name, arg1, arg2) do {                      \
    TCGv_i32 helper_tmp = tcg_const_i32(arg2);                    \
    gen_helper_##name(arg1, helper_tmp);                          \
    tcg_temp_free_i32(helper_tmp);                                \
    } while(0)

#define gen_helper_2i(name, arg1, arg2, arg3) do {                \
    TCGv_i32 helper_tmp = tcg_const_i32(arg3);                    \
    gen_helper_##name(arg1, arg2, helper_tmp);                    \
    tcg_temp_free_i32(helper_tmp);                                \
    } while(0)

#define gen_helper_3i(name, arg1, arg2, arg3, arg4) do {          \
    TCGv_i32 helper_tmp = tcg_const_i32(arg4);                    \
    gen_helper_##name(arg1, arg2, arg3, helper_tmp);              \
    tcg_temp_free_i32(helper_tmp);                                \
    } while(0)

typedef struct DisasContext {
    struct TranslationBlock *tb;
    target_ulong pc, saved_pc;
    uint32_t opcode;
    int singlestep_enabled;
    /* Routine used to access memory */
    int mem_idx;
    uint32_t hflags, saved_hflags;
    int bstate;
    target_ulong btarget;
} DisasContext;

enum {
    BS_NONE     = 0, /* We go out of the TB without reaching a branch or an
                      * exception condition */
    BS_STOP     = 1, /* We want to stop translation for any reason */
    BS_BRANCH   = 2, /* We reached a branch condition     */
    BS_EXCP     = 3, /* We reached an exception condition */
};

static const char *regnames[] =
    { "r0", "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", "s8", "ra", };

static const char *regnames_HI[] =
    { "HI0", "HI1", "HI2", "HI3", };

static const char *regnames_LO[] =
    { "LO0", "LO1", "LO2", "LO3", };

static const char *regnames_ACX[] =
    { "ACX0", "ACX1", "ACX2", "ACX3", };

static const char *fregnames[] =
    { "f0",  "f1",  "f2",  "f3",  "f4",  "f5",  "f6",  "f7",
      "f8",  "f9",  "f10", "f11", "f12", "f13", "f14", "f15",
      "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
      "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", };

#ifdef MIPS_DEBUG_DISAS
#define MIPS_DEBUG(fmt, ...)                         \
        qemu_log_mask(CPU_LOG_TB_IN_ASM,                \
                       TARGET_FMT_lx ": %08x " fmt "\n", \
                       ctx->pc, ctx->opcode , ## __VA_ARGS__)
#define LOG_DISAS(...) qemu_log_mask(CPU_LOG_TB_IN_ASM, ## __VA_ARGS__)
#else
#define MIPS_DEBUG(fmt, ...) do { } while(0)
#define LOG_DISAS(...) do { } while (0)
#endif

#define MIPS_INVAL(op)                                                        \
do {                                                                          \
    MIPS_DEBUG("Invalid %s %03x %03x %03x", op, ctx->opcode >> 26,            \
               ctx->opcode & 0x3F, ((ctx->opcode >> 16) & 0x1F));             \
} while (0)

/* General purpose registers moves. */
static inline void gen_load_gpr (TCGv t, int reg)
{
    if (reg == 0)
        tcg_gen_movi_tl(t, 0);
    else
        tcg_gen_mov_tl(t, cpu_gpr[reg]);
}

static inline void gen_store_gpr (TCGv t, int reg)
{
    if (reg != 0)
        tcg_gen_mov_tl(cpu_gpr[reg], t);
}

/* Moves to/from ACX register.  */
static inline void gen_load_ACX (TCGv t, int reg)
{
    tcg_gen_mov_tl(t, cpu_ACX[reg]);
}

static inline void gen_store_ACX (TCGv t, int reg)
{
    tcg_gen_mov_tl(cpu_ACX[reg], t);
}

/* Moves to/from shadow registers. */
static inline void gen_load_srsgpr (int from, int to)
{
    TCGv t0 = tcg_temp_new();

    if (from == 0)
        tcg_gen_movi_tl(t0, 0);
    else {
        TCGv_i32 t2 = tcg_temp_new_i32();
        TCGv_ptr addr = tcg_temp_new_ptr();

        tcg_gen_ld_i32(t2, cpu_env, offsetof(CPUState, CP0_SRSCtl));
        tcg_gen_shri_i32(t2, t2, CP0SRSCtl_PSS);
        tcg_gen_andi_i32(t2, t2, 0xf);
        tcg_gen_muli_i32(t2, t2, sizeof(target_ulong) * 32);
        tcg_gen_ext_i32_ptr(addr, t2);
        tcg_gen_add_ptr(addr, cpu_env, addr);

        tcg_gen_ld_tl(t0, addr, sizeof(target_ulong) * from);
        tcg_temp_free_ptr(addr);
        tcg_temp_free_i32(t2);
    }
    gen_store_gpr(t0, to);
    tcg_temp_free(t0);
}

static inline void gen_store_srsgpr (int from, int to)
{
    if (to != 0) {
        TCGv t0 = tcg_temp_new();
        TCGv_i32 t2 = tcg_temp_new_i32();
        TCGv_ptr addr = tcg_temp_new_ptr();

        gen_load_gpr(t0, from);
        tcg_gen_ld_i32(t2, cpu_env, offsetof(CPUState, CP0_SRSCtl));
        tcg_gen_shri_i32(t2, t2, CP0SRSCtl_PSS);
        tcg_gen_andi_i32(t2, t2, 0xf);
        tcg_gen_muli_i32(t2, t2, sizeof(target_ulong) * 32);
        tcg_gen_ext_i32_ptr(addr, t2);
        tcg_gen_add_ptr(addr, cpu_env, addr);

        tcg_gen_st_tl(t0, addr, sizeof(target_ulong) * to);
        tcg_temp_free_ptr(addr);
        tcg_temp_free_i32(t2);
        tcg_temp_free(t0);
    }
}

/* Floating point register moves. */
static inline void gen_load_fpr32 (TCGv_i32 t, int reg)
{
    tcg_gen_ld_i32(t, cpu_env, offsetof(CPUState, active_fpu.fpr[reg].w[FP_ENDIAN_IDX]));
}

static inline void gen_store_fpr32 (TCGv_i32 t, int reg)
{
    tcg_gen_st_i32(t, cpu_env, offsetof(CPUState, active_fpu.fpr[reg].w[FP_ENDIAN_IDX]));
}

static inline void gen_load_fpr32h (TCGv_i32 t, int reg)
{
    tcg_gen_ld_i32(t, cpu_env, offsetof(CPUState, active_fpu.fpr[reg].w[!FP_ENDIAN_IDX]));
}

static inline void gen_store_fpr32h (TCGv_i32 t, int reg)
{
    tcg_gen_st_i32(t, cpu_env, offsetof(CPUState, active_fpu.fpr[reg].w[!FP_ENDIAN_IDX]));
}

static inline void gen_load_fpr64 (DisasContext *ctx, TCGv_i64 t, int reg)
{
    if (ctx->hflags & MIPS_HFLAG_F64) {
        tcg_gen_ld_i64(t, cpu_env, offsetof(CPUState, active_fpu.fpr[reg].d));
    } else {
        TCGv_i32 t0 = tcg_temp_new_i32();
        TCGv_i32 t1 = tcg_temp_new_i32();
        gen_load_fpr32(t0, reg & ~1);
        gen_load_fpr32(t1, reg | 1);
        tcg_gen_concat_i32_i64(t, t0, t1);
        tcg_temp_free_i32(t0);
        tcg_temp_free_i32(t1);
    }
}

static inline void gen_store_fpr64 (DisasContext *ctx, TCGv_i64 t, int reg)
{
    if (ctx->hflags & MIPS_HFLAG_F64) {
        tcg_gen_st_i64(t, cpu_env, offsetof(CPUState, active_fpu.fpr[reg].d));
    } else {
        TCGv_i64 t0 = tcg_temp_new_i64();
        TCGv_i32 t1 = tcg_temp_new_i32();
        tcg_gen_trunc_i64_i32(t1, t);
        gen_store_fpr32(t1, reg & ~1);
        tcg_gen_shri_i64(t0, t, 32);
        tcg_gen_trunc_i64_i32(t1, t0);
        gen_store_fpr32(t1, reg | 1);
        tcg_temp_free_i32(t1);
        tcg_temp_free_i64(t0);
    }
}

static inline int get_fp_bit (int cc)
{
    if (cc)
        return 24 + cc;
    else
        return 23;
}

/* Tests */
static inline void gen_save_pc(target_ulong pc)
{
    tcg_gen_movi_tl(cpu_PC, pc);
}

static inline void save_cpu_state (DisasContext *ctx, int do_save_pc)
{
    LOG_DISAS("hflags %08x saved %08x\n", ctx->hflags, ctx->saved_hflags);
    if (do_save_pc && ctx->pc != ctx->saved_pc) {
        gen_save_pc(ctx->pc);
        ctx->saved_pc = ctx->pc;
    }
    if (ctx->hflags != ctx->saved_hflags) {
        tcg_gen_movi_i32(hflags, ctx->hflags);
        ctx->saved_hflags = ctx->hflags;
        switch (ctx->hflags & MIPS_HFLAG_BMASK_BASE) {
        case MIPS_HFLAG_BR:
            break;
        case MIPS_HFLAG_BC:
        case MIPS_HFLAG_BL:
        case MIPS_HFLAG_B:
            tcg_gen_movi_tl(btarget, ctx->btarget);
            break;
        }
    }
}

static inline void restore_cpu_state (CPUState *env, DisasContext *ctx)
{
    ctx->saved_hflags = ctx->hflags;
    switch (ctx->hflags & MIPS_HFLAG_BMASK_BASE) {
    case MIPS_HFLAG_BR:
        break;
    case MIPS_HFLAG_BC:
    case MIPS_HFLAG_BL:
    case MIPS_HFLAG_B:
        ctx->btarget = env->btarget;
        break;
    }
}

static inline void
generate_exception_err (DisasContext *ctx, int excp, int err)
{
    TCGv_i32 texcp = tcg_const_i32(excp);
    TCGv_i32 terr = tcg_const_i32(err);
    save_cpu_state(ctx, 1);
    gen_helper_raise_exception_err(texcp, terr);
    tcg_temp_free_i32(terr);
    tcg_temp_free_i32(texcp);
}

static inline void
generate_exception (DisasContext *ctx, int excp)
{
    save_cpu_state(ctx, 1);
    gen_helper_0i(raise_exception, excp);
}

/* Addresses computation */
static inline void gen_op_addr_add (DisasContext *ctx, TCGv ret, TCGv arg0, TCGv arg1)
{
    tcg_gen_add_tl(ret, arg0, arg1);

#if defined(TARGET_MIPS64)
    /* For compatibility with 32-bit code, data reference in user mode
       with Status_UX = 0 should be casted to 32-bit and sign extended.
       See the MIPS64 PRA manual, section 4.10. */
    if (((ctx->hflags & MIPS_HFLAG_KSU) == MIPS_HFLAG_UM) &&
        !(ctx->hflags & MIPS_HFLAG_UX)) {
        tcg_gen_ext32s_i64(ret, ret);
    }
#endif
}

static inline void check_cp0_enabled(DisasContext *ctx)
{
    if (unlikely(!(ctx->hflags & MIPS_HFLAG_CP0)))
        generate_exception_err(ctx, EXCP_CpU, 0);
}

static inline void check_cp1_enabled(DisasContext *ctx)
{
    if (unlikely(!(ctx->hflags & MIPS_HFLAG_FPU)))
        generate_exception_err(ctx, EXCP_CpU, 1);
}

/* Verify that the processor is running with COP1X instructions enabled.
   This is associated with the nabla symbol in the MIPS32 and MIPS64
   opcode tables.  */

static inline void check_cop1x(DisasContext *ctx)
{
    if (unlikely(!(ctx->hflags & MIPS_HFLAG_COP1X)))
        generate_exception(ctx, EXCP_RI);
}

/* Verify that the processor is running with 64-bit floating-point
   operations enabled.  */

static inline void check_cp1_64bitmode(DisasContext *ctx)
{
    if (unlikely(~ctx->hflags & (MIPS_HFLAG_F64 | MIPS_HFLAG_COP1X)))
        generate_exception(ctx, EXCP_RI);
}

/*
 * Verify if floating point register is valid; an operation is not defined
 * if bit 0 of any register specification is set and the FR bit in the
 * Status register equals zero, since the register numbers specify an
 * even-odd pair of adjacent coprocessor general registers. When the FR bit
 * in the Status register equals one, both even and odd register numbers
 * are valid. This limitation exists only for 64 bit wide (d,l,ps) registers.
 *
 * Multiple 64 bit wide registers can be checked by calling
 * gen_op_cp1_registers(freg1 | freg2 | ... | fregN);
 */
static inline void check_cp1_registers(DisasContext *ctx, int regs)
{
    if (unlikely(!(ctx->hflags & MIPS_HFLAG_F64) && (regs & 1)))
        generate_exception(ctx, EXCP_RI);
}

/* This code generates a "reserved instruction" exception if the
   CPU does not support the instruction set corresponding to flags. */
static inline void check_insn(CPUState *env, DisasContext *ctx, int flags)
{
    if (unlikely(!(env->insn_flags & flags)))
        generate_exception(ctx, EXCP_RI);
}

/* This code generates a "reserved instruction" exception if 64-bit
   instructions are not enabled. */
static inline void check_mips_64(DisasContext *ctx)
{
    if (unlikely(!(ctx->hflags & MIPS_HFLAG_64)))
        generate_exception(ctx, EXCP_RI);
}

/* Define small wrappers for gen_load_fpr* so that we have a uniform
   calling interface for 32 and 64-bit FPRs.  No sense in changing
   all callers for gen_load_fpr32 when we need the CTX parameter for
   this one use.  */
#define gen_ldcmp_fpr32(ctx, x, y) gen_load_fpr32(x, y)
#define gen_ldcmp_fpr64(ctx, x, y) gen_load_fpr64(ctx, x, y)
#define FOP_CONDS(type, abs, fmt, ifmt, bits)                                 \
static inline void gen_cmp ## type ## _ ## fmt(DisasContext *ctx, int n,      \
                                               int ft, int fs, int cc)        \
{                                                                             \
    TCGv_i##bits fp0 = tcg_temp_new_i##bits ();                               \
    TCGv_i##bits fp1 = tcg_temp_new_i##bits ();                               \
    switch (ifmt) {                                                           \
    case FMT_PS:                                                              \
        check_cp1_64bitmode(ctx);                                             \
        break;                                                                \
    case FMT_D:                                                               \
        if (abs) {                                                            \
            check_cop1x(ctx);                                                 \
        }                                                                     \
        check_cp1_registers(ctx, fs | ft);                                    \
        break;                                                                \
    case FMT_S:                                                               \
        if (abs) {                                                            \
            check_cop1x(ctx);                                                 \
        }                                                                     \
        break;                                                                \
    }                                                                         \
    gen_ldcmp_fpr##bits (ctx, fp0, fs);                                       \
    gen_ldcmp_fpr##bits (ctx, fp1, ft);                                       \
    switch (n) {                                                              \
    case  0: gen_helper_2i(cmp ## type ## _ ## fmt ## _f, fp0, fp1, cc);    break;\
    case  1: gen_helper_2i(cmp ## type ## _ ## fmt ## _un, fp0, fp1, cc);   break;\
    case  2: gen_helper_2i(cmp ## type ## _ ## fmt ## _eq, fp0, fp1, cc);   break;\
    case  3: gen_helper_2i(cmp ## type ## _ ## fmt ## _ueq, fp0, fp1, cc);  break;\
    case  4: gen_helper_2i(cmp ## type ## _ ## fmt ## _olt, fp0, fp1, cc);  break;\
    case  5: gen_helper_2i(cmp ## type ## _ ## fmt ## _ult, fp0, fp1, cc);  break;\
    case  6: gen_helper_2i(cmp ## type ## _ ## fmt ## _ole, fp0, fp1, cc);  break;\
    case  7: gen_helper_2i(cmp ## type ## _ ## fmt ## _ule, fp0, fp1, cc);  break;\
    case  8: gen_helper_2i(cmp ## type ## _ ## fmt ## _sf, fp0, fp1, cc);   break;\
    case  9: gen_helper_2i(cmp ## type ## _ ## fmt ## _ngle, fp0, fp1, cc); break;\
    case 10: gen_helper_2i(cmp ## type ## _ ## fmt ## _seq, fp0, fp1, cc);  break;\
    case 11: gen_helper_2i(cmp ## type ## _ ## fmt ## _ngl, fp0, fp1, cc);  break;\
    case 12: gen_helper_2i(cmp ## type ## _ ## fmt ## _lt, fp0, fp1, cc);   break;\
    case 13: gen_helper_2i(cmp ## type ## _ ## fmt ## _nge, fp0, fp1, cc);  break;\
    case 14: gen_helper_2i(cmp ## type ## _ ## fmt ## _le, fp0, fp1, cc);   break;\
    case 15: gen_helper_2i(cmp ## type ## _ ## fmt ## _ngt, fp0, fp1, cc);  break;\
    default: abort();                                                         \
    }                                                                         \
    tcg_temp_free_i##bits (fp0);                                              \
    tcg_temp_free_i##bits (fp1);                                              \
}

FOP_CONDS(, 0, d, FMT_D, 64)
FOP_CONDS(abs, 1, d, FMT_D, 64)
FOP_CONDS(, 0, s, FMT_S, 32)
FOP_CONDS(abs, 1, s, FMT_S, 32)
FOP_CONDS(, 0, ps, FMT_PS, 64)
FOP_CONDS(abs, 1, ps, FMT_PS, 64)
#undef FOP_CONDS
#undef gen_ldcmp_fpr32
#undef gen_ldcmp_fpr64

/* load/store instructions. */
#define OP_LD(insn,fname)                                                 \
static inline void op_ldst_##insn(TCGv ret, TCGv arg1, DisasContext *ctx) \
{                                                                         \
    tcg_gen_qemu_##fname(ret, arg1, ctx->mem_idx);                        \
}
OP_LD(lb,ld8s);
OP_LD(lbu,ld8u);
OP_LD(lh,ld16s);
OP_LD(lhu,ld16u);
OP_LD(lw,ld32s);
#if defined(TARGET_MIPS64)
OP_LD(lwu,ld32u);
OP_LD(ld,ld64);
#endif
#undef OP_LD

#define OP_ST(insn,fname)                                                  \
static inline void op_ldst_##insn(TCGv arg1, TCGv arg2, DisasContext *ctx) \
{                                                                          \
    tcg_gen_qemu_##fname(arg1, arg2, ctx->mem_idx);                        \
}
OP_ST(sb,st8);
OP_ST(sh,st16);
OP_ST(sw,st32);
#if defined(TARGET_MIPS64)
OP_ST(sd,st64);
#endif
#undef OP_ST

#ifdef CONFIG_USER_ONLY
#define OP_LD_ATOMIC(insn,fname)                                           \
static inline void op_ldst_##insn(TCGv ret, TCGv arg1, DisasContext *ctx)  \
{                                                                          \
    TCGv t0 = tcg_temp_new();                                              \
    tcg_gen_mov_tl(t0, arg1);                                              \
    tcg_gen_qemu_##fname(ret, arg1, ctx->mem_idx);                         \
    tcg_gen_st_tl(t0, cpu_env, offsetof(CPUState, lladdr));                \
    tcg_gen_st_tl(ret, cpu_env, offsetof(CPUState, llval));                \
    tcg_temp_free(t0);                                                     \
}
#else
#define OP_LD_ATOMIC(insn,fname)                                           \
static inline void op_ldst_##insn(TCGv ret, TCGv arg1, DisasContext *ctx)  \
{                                                                          \
    gen_helper_2i(insn, ret, arg1, ctx->mem_idx);                          \
}
#endif
OP_LD_ATOMIC(ll,ld32s);
#if defined(TARGET_MIPS64)
OP_LD_ATOMIC(lld,ld64);
#endif
#undef OP_LD_ATOMIC

#ifdef CONFIG_USER_ONLY
#define OP_ST_ATOMIC(insn,fname,ldname,almask)                               \
static inline void op_ldst_##insn(TCGv arg1, TCGv arg2, int rt, DisasContext *ctx) \
{                                                                            \
    TCGv t0 = tcg_temp_new();                                                \
    int l1 = gen_new_label();                                                \
    int l2 = gen_new_label();                                                \
                                                                             \
    tcg_gen_andi_tl(t0, arg2, almask);                                       \
    tcg_gen_brcondi_tl(TCG_COND_EQ, t0, 0, l1);                              \
    tcg_gen_st_tl(arg2, cpu_env, offsetof(CPUState, CP0_BadVAddr));          \
    generate_exception(ctx, EXCP_AdES);                                      \
    gen_set_label(l1);                                                       \
    tcg_gen_ld_tl(t0, cpu_env, offsetof(CPUState, lladdr));                  \
    tcg_gen_brcond_tl(TCG_COND_NE, arg2, t0, l2);                            \
    tcg_gen_movi_tl(t0, rt | ((almask << 3) & 0x20));                        \
    tcg_gen_st_tl(t0, cpu_env, offsetof(CPUState, llreg));                   \
    tcg_gen_st_tl(arg1, cpu_env, offsetof(CPUState, llnewval));              \
    gen_helper_0i(raise_exception, EXCP_SC);                                 \
    gen_set_label(l2);                                                       \
    tcg_gen_movi_tl(t0, 0);                                                  \
    gen_store_gpr(t0, rt);                                                   \
    tcg_temp_free(t0);                                                       \
}
#else
#define OP_ST_ATOMIC(insn,fname,ldname,almask)                               \
static inline void op_ldst_##insn(TCGv arg1, TCGv arg2, int rt, DisasContext *ctx) \
{                                                                            \
    TCGv t0 = tcg_temp_new();                                                \
    gen_helper_3i(insn, t0, arg1, arg2, ctx->mem_idx);                       \
    gen_store_gpr(t0, rt);                                                   \
    tcg_temp_free(t0);                                                       \
}
#endif
OP_ST_ATOMIC(sc,st32,ld32s,0x3);
#if defined(TARGET_MIPS64)
OP_ST_ATOMIC(scd,st64,ld64,0x7);
#endif
#undef OP_ST_ATOMIC

static void gen_base_offset_addr (DisasContext *ctx, TCGv addr,
                                  int base, int16_t offset)
{
    if (base == 0) {
        tcg_gen_movi_tl(addr, offset);
    } else if (offset == 0) {
        gen_load_gpr(addr, base);
    } else {
        tcg_gen_movi_tl(addr, offset);
        gen_op_addr_add(ctx, addr, cpu_gpr[base], addr);
    }
}

static target_ulong pc_relative_pc (DisasContext *ctx)
{
    target_ulong pc = ctx->pc;

    if (ctx->hflags & MIPS_HFLAG_BMASK) {
        int branch_bytes = ctx->hflags & MIPS_HFLAG_BDS16 ? 2 : 4;