
#include "m32r.hpp"

struct opcode {
    int instruction;        // instruction name

// flags for opcode_flags
#define OC_1        0x00000001    // first 4 bits, 0xF000
#define OC_2        0x00000002    // second 4 bits, 0x0F00
#define OC_3        0x00000004    // third 4 bits, 0x00F0
#define OC_4        0x00000008    // last 4 bits, 0x000F

    int opcode_flags;        // flags to situate the operation code (example OC_1|OC_3 : first and third operands)
    int opcode_value;        // value for the operation code

// flags for op[1-3].flags

// operand type
#define OP_REG      0x00000001    // operand is register
#define OP_IMM      0x00000002    // operand is immediate
#define OP_ADDR     0x00000004    // operand is immediate

// operand size
#define OP_S4       0x00000010    // operand is 4 bits long
#define OP_S8       0x00000020    // operand is 8 bits long
#define OP_S16      0x00000040    // operand is 16 bits long
#define OP_S24      0x00000080    // operand is 24 bits long

// operand offset
#define OP_O4       0x00000100     // operand is located at offset 4
#define OP_O8       0x00000200     // operand is located at offset 8
#define OP_O12      0x00000400     // operand is located at offset 12
#define OP_O16      0x00000800     // operand is located at offset 16

// operand phrase type (optionnal for non-phrase op)
#define OP_PHRASE1  0x00001000    // @R
#define OP_PHRASE2  0x00002000    // @R+
#define OP_PHRASE4  0x00008000    // @+R
#define OP_PHRASE5  0x00010000    // @-R

// displacement argument
#define OP_DISPL_A    0x00004000    // reg in @(imm, reg)
#define OP_DISPL_B    0x00100000    // imm in @(imm, reg)

    int op1_flags;        // first operand flags, if exists
    int op2_flags;        // second operand flags, if exists
    int op3_flags;        // third operand flags, if exists

#define op1     op1_flags
#define op2     op2_flags
#define op3     op3_flags
};

static const struct opcode opcodes[] = {

    { m32r_add,       OC_1|OC_3,            0x000A,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_add3,      OC_1|OC_3,            0x008A,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      OP_IMM|OP_S16|OP_O16            },
    { m32r_addi,      OC_1,                 0x0004,        OP_REG|OP_S4|OP_O4,     OP_IMM|OP_S8|OP_O8,       0                               },
    { m32r_addv,      OC_1|OC_3,            0x0008,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_addv3,     OC_1|OC_3,            0x0088,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      OP_IMM|OP_S16|OP_O16            },
    { m32r_addx,      OC_1|OC_3,            0x0009,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_and,       OC_1|OC_3,            0x000C,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_and3,      OC_1|OC_3,            0x008C,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      OP_IMM|OP_S16|OP_O16            },
    { m32r_bc,        OC_1|OC_2,            0x007C,        OP_ADDR|OP_S8|OP_O8,    0,                        0                               },
    { m32r_bc,        OC_1|OC_2,            0x00FC,        OP_ADDR|OP_S24|OP_O8,   0,                        0                               },
    { m32r_beq,       OC_1|OC_3,            0x00B0,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      OP_ADDR|OP_S16|OP_O16           },
    { m32r_beqz,      OC_1|OC_2|OC_3,       0x0B08,        OP_REG|OP_S4|OP_O12,    OP_ADDR|OP_S16|OP_O16,    0                               },
    { m32r_bgez,      OC_1|OC_2|OC_3,       0x0B0B,        OP_REG|OP_S4|OP_O12,    OP_ADDR|OP_S16|OP_O16,    0                               },
    { m32r_bgtz,      OC_1|OC_2|OC_3,       0x0B0D,        OP_REG|OP_S4|OP_O12,    OP_ADDR|OP_S16|OP_O16,    0                               },
    { m32r_bl,        OC_1|OC_2,            0x007E,        OP_ADDR|OP_S8|OP_O8,    0,                        0                               },
    { m32r_bl,        OC_1|OC_2,            0x00FE,        OP_ADDR|OP_S24|OP_O8,   0,                        0                               },
    { m32r_blez,      OC_1|OC_2|OC_3,       0x0B0C,        OP_REG|OP_S4|OP_O12,    OP_ADDR|OP_S16|OP_O16,    0                               },
    { m32r_bltz,      OC_1|OC_2|OC_3,       0x0B0A,        OP_REG|OP_S4|OP_O12,    OP_ADDR|OP_S16|OP_O16,    0                               },
    { m32r_bnc,       OC_1|OC_2,            0x007D,        OP_ADDR|OP_S8|OP_O8,    0,                        0                               },
    { m32r_bnc,       OC_1|OC_2,            0x00FD,        OP_ADDR|OP_S24|OP_O8,   0,                        0                               },
    { m32r_bne,       OC_1|OC_3,            0x00B1,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      OP_ADDR|OP_S16|OP_O16           },
    { m32r_bnez,      OC_1|OC_2|OC_3,       0x0B09,        OP_REG|OP_S4|OP_O12,    OP_ADDR|OP_S16|OP_O16,    0                               },
    { m32r_bra,       OC_1|OC_2,            0x007F,        OP_ADDR|OP_S8|OP_O8,    0,                        0                               },
    { m32r_bra,       OC_1|OC_2,            0x00FF,        OP_ADDR|OP_S24|OP_O8,   0,                        0                               },
    { m32r_cmp,       OC_1|OC_3,            0x0004,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_cmpi,      OC_1|OC_2|OC_3,       0x0804,        OP_REG|OP_S4|OP_O12,    OP_IMM|OP_S16|OP_O16,     0                               },
    { m32r_cmpu,      OC_1|OC_3,            0x0005,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_cmpui,     OC_1|OC_2|OC_3,       0x0805,        OP_REG|OP_S4|OP_O12,    OP_IMM|OP_S16|OP_O16,     0                               },
    { m32r_div,       OC_1|OC_3,            0x0090,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_divu,      OC_1|OC_3,            0x0091,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_jl,        OC_1|OC_2|OC_3,       0x01EC,        OP_REG|OP_S4|OP_O12,    0,                        0                               },
    { m32r_jmp,       OC_1|OC_2|OC_3,       0x01FC,        OP_REG|OP_S4|OP_O12,    0,                        0                               },
    { m32r_ld,        OC_1|OC_3,            0x002C,        OP_REG|OP_S4|OP_O4,     OP_PHRASE1|OP_S4|OP_O12,  0                               },
    { m32r_ld,        OC_1|OC_3,            0x002E,        OP_REG|OP_S4|OP_O4,     OP_PHRASE2|OP_S4|OP_O12,  0                               },
    { m32r_ld,        OC_1|OC_3,            0x00AC,        OP_REG|OP_S4|OP_O4,     OP_DISPL_A|OP_S4|OP_O12,  OP_DISPL_B|OP_S16|OP_O16        },
    { m32r_ld24,      OC_1,                 0x000E,        OP_REG|OP_S4|OP_O4,     OP_IMM|OP_S24|OP_O8,      0                               },
    { m32r_ldb,       OC_1|OC_3,            0x0028,        OP_REG|OP_S4|OP_O4,     OP_PHRASE1|OP_S4|OP_O12,  0                               },
    { m32r_ldb,       OC_1|OC_3,            0x00A8,        OP_REG|OP_S4|OP_O4,     OP_DISPL_A|OP_S4|OP_O12,  OP_DISPL_B|OP_S16|OP_O16        },
    { m32r_ldh,       OC_1|OC_3,            0x002A,        OP_REG|OP_S4|OP_O4,     OP_PHRASE1|OP_S4|OP_O12,  0                               },
    { m32r_ldh,       OC_1|OC_3,            0x00AA,        OP_REG|OP_S4|OP_O4,     OP_DISPL_A|OP_S4|OP_O12,  OP_DISPL_B|OP_S16|OP_O16        },
    { m32r_ldi,       OC_1,                 0x0006,        OP_REG|OP_S4|OP_O4,     OP_IMM|OP_S8|OP_O8,       0                               },
    { m32r_ldi,       OC_1|OC_3|OC_4,       0x09F0,        OP_REG|OP_S4|OP_O4,     OP_IMM|OP_S16|OP_O16,     0                               },
    { m32r_ldub,      OC_1|OC_3,            0x0029,        OP_REG|OP_S4|OP_O4,     OP_PHRASE1|OP_S4|OP_O12,  0                               },
    { m32r_ldub,      OC_1|OC_3,            0x00A9,        OP_REG|OP_S4|OP_O4,     OP_DISPL_A|OP_S4|OP_O12,  OP_DISPL_B|OP_S16|OP_O16        },
    { m32r_lduh,      OC_1|OC_3,            0x002B,        OP_REG|OP_S4|OP_O4,     OP_PHRASE1|OP_S4|OP_O12,  0                               },
    { m32r_lduh,      OC_1|OC_3,            0x00AB,        OP_REG|OP_S4|OP_O4,     OP_DISPL_A|OP_S4|OP_O12,  OP_DISPL_B|OP_S16|OP_O16        },
    { m32r_lock,      OC_1|OC_3,            0x002D,        OP_REG|OP_S4|OP_O4,     OP_PHRASE1|OP_S4|OP_O12,  0                               },
    { m32r_machi,     OC_1|OC_3,            0x0034,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_maclo,     OC_1|OC_3,            0x0035,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_macwhi,    OC_1|OC_3,            0x0036,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_macwlo,    OC_1|OC_3,            0x0037,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_mul,       OC_1|OC_3,            0x0016,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_mulhi,     OC_1|OC_3,            0x0030,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_mullo,     OC_1|OC_3,            0x0031,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_mulwhi,    OC_1|OC_3,            0x0032,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_mulwlo,    OC_1|OC_3,            0x0033,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_mv,        OC_1|OC_3,            0x0018,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_mvfachi,   OC_1|OC_3|OC_4,       0x05F0,        OP_REG|OP_S4|OP_O4,     0,                        0                               },
    { m32r_mvfaclo,   OC_1|OC_3|OC_4,       0x05F1,        OP_REG|OP_S4|OP_O4,     0,                        0                               },
    { m32r_mvfacmi,   OC_1|OC_3|OC_4,       0x05F2,        OP_REG|OP_S4|OP_O4,     0,                        0                               },
    { m32r_mvfc,      OC_1|OC_3,            0x0019,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_mvtachi,   OC_1|OC_3|OC_4,       0x0570,        OP_REG|OP_S4|OP_O4,     0,                        0                               },
    { m32r_mvtaclo,   OC_1|OC_3|OC_4,       0x0571,        OP_REG|OP_S4|OP_O4,     0,                        0                               },
    { m32r_mvtc,      OC_1|OC_3,            0x001A,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_neg,       OC_1|OC_3,            0x0003,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_nop,       OC_1|OC_2|OC_3|OC_4,  0x7000,        0,                      0,                        0                               },
    { m32r_not,       OC_1|OC_3,            0x000B,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_or,        OC_1|OC_3,            0x000E,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_or3,       OC_1|OC_3,            0x008E,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      OP_IMM|OP_S16|OP_O16            },
    { m32r_rac,       OC_1|OC_2|OC_3|OC_4,  0x5090,        0,                      0,                        0                               },
    { m32r_rach,      OC_1|OC_2|OC_3|OC_4,  0x5080,        0,                      0,                        0                               },
    { m32r_rem,       OC_1|OC_3,            0x0092,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_remu,      OC_1|OC_3,            0x0093,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_rte,       OC_1|OC_2|OC_3|OC_4,  0x10D6,        0,                      0,                        0                               },
    { m32r_seth,      OC_1|OC_3|OC_4,       0x0DC0,        OP_REG|OP_S4|OP_O4,     OP_IMM|OP_S16|OP_O16,     0                               },
    { m32r_sll,       OC_1|OC_3,            0x0014,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_sll3,      OC_1|OC_3,            0x009C,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      OP_IMM|OP_S16|OP_O16            },
    { m32r_sra,       OC_1|OC_3,            0x0012,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_sra3,      OC_1|OC_3,            0x009A,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      OP_IMM|OP_S16|OP_O16            },
#if 0
    { m32r_srai,    OC_1|OC_3,            0x0051    },    // Shirt right arithmetic immediate
    { m32r_slli,    OC_1|OC_3,            0x0082    },    // Shift left logical immediate
    { m32r_srli,    OC_1|OC_3,            0x0050    },    // Shift right logical immediate
#endif
    { m32r_srl,       OC_1|OC_3,            0x0010,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_srl3,      OC_1|OC_3,            0x0098,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      OP_IMM|OP_S16|OP_O16            },
    { m32r_st,        OC_1|OC_3,            0x0024,        OP_REG|OP_S4|OP_O4,     OP_PHRASE1|OP_S4|OP_O12,  0                               },
    { m32r_st,        OC_1|OC_3,            0x0026,        OP_REG|OP_S4|OP_O4,     OP_PHRASE4|OP_S4|OP_O12,  0                               },
    { m32r_st,        OC_1|OC_3,            0x0027,        OP_REG|OP_S4|OP_O4,     OP_PHRASE5|OP_S4|OP_O12,  0                               },
    { m32r_st,        OC_1|OC_3,            0x00A4,        OP_REG|OP_S4|OP_O4,     OP_DISPL_A|OP_S4|OP_O12,  OP_DISPL_B|OP_S16|OP_O16        },
    { m32r_stb,       OC_1|OC_3,            0x0020,        OP_REG|OP_S4|OP_O4,     OP_PHRASE1|OP_S4|OP_O12,  0                               },
    { m32r_stb,       OC_1|OC_3,            0x00A0,        OP_REG|OP_S4|OP_O4,     OP_DISPL_A|OP_S4|OP_O12,  OP_DISPL_B|OP_S16|OP_O16        },
    { m32r_sth,       OC_1|OC_3,            0x0022,        OP_REG|OP_S4|OP_O4,     OP_PHRASE1|OP_S4|OP_O12,  0                               },
    { m32r_sth,       OC_1|OC_3,            0x00A2,        OP_REG|OP_S4|OP_O4,     OP_DISPL_A|OP_S4|OP_O12,  OP_DISPL_B|OP_S16|OP_O16        },
    { m32r_sub,       OC_1|OC_3,            0x0002,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_subv,      OC_1|OC_3,            0x0000,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_subx,      OC_1|OC_3,            0x0001,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_trap,      OC_1|OC_2|OC_3,       0x010F,        OP_IMM|OP_S4|OP_O12,    0,                        0                               },
    { m32r_unlock,    OC_1|OC_3,            0x0025,        OP_REG|OP_S4|OP_O4,     OP_PHRASE1|OP_S4|OP_O12,  0                               },
    { m32r_xor,       OC_1|OC_3,            0x000D,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32r_xor3,      OC_1|OC_3,            0x008D,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      OP_IMM|OP_S16|OP_O16            }
};

// M32RX additionnal opcodes :
static const struct opcode ext_opcodes[] = {

    { m32rx_bcl,      OC_1|OC_2,            0x0078,        OP_ADDR|OP_S8|OP_O8,    0,                        0                               },
    { m32rx_bcl,      OC_1|OC_2,            0x00F8,        OP_ADDR|OP_S24|OP_O8,   0,                        0                               },
    { m32rx_bncl,     OC_1|OC_2,            0x0079,        OP_ADDR|OP_S8|OP_O8,    0,                        0                               },
    { m32rx_bncl,     OC_1|OC_2,            0x00F9,        OP_ADDR|OP_S24|OP_O8,   0,                        0                               },
    { m32rx_cmpeq,    OC_1|OC_3,            0x0006,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32rx_cmpz,     OC_1|OC_2|OC_3,       0x0007,        OP_REG|OP_S4|OP_O12,    0,                        0                               },
    { m32rx_mulwu1,   OC_1|OC_3,            0x005A,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32rx_macwu1,   OC_1|OC_3,            0x005B,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32rx_maclh1,   OC_1|OC_3,            0x005C,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32rx_msblo,    OC_1|OC_3,            0x005D,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32rx_sadd,     OC_1|OC_2|OC_3|OC_4,  0x50E4,        0,                      0,                        0                               },
    { m32rx_sat,      OC_1|OC_3,            0x0086,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
#if 0
    { m32rx_divh,      OC_1|OC_3,            0x0090,        OP_REG|OP_S4|OP_O4,       OP_REG|OP_S4|OP_O12,      0                                 },
#endif
    { m32rx_mulhi,    OC_1|OC_3,            0x0038,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32rx_mullo,    OC_1|OC_3,            0x0039,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32rx_machi,    OC_1|OC_3,            0x003C,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32rx_maclo,    OC_1|OC_3,            0x003D,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32rx_mvfachi,  OC_1|OC_3|OC_4,       0x05F4,        OP_REG|OP_S4|OP_O4,     0,                        0                               },
    { m32rx_mvfaclo,  OC_1|OC_3|OC_4,       0x05F5,        OP_REG|OP_S4|OP_O4,     0,                        0                               },
    { m32rx_mvfacmi,  OC_1|OC_3|OC_4,       0x05F6,        OP_REG|OP_S4|OP_O4,     0,                        0                               },
    { m32rx_mvtachi,  OC_1|OC_3|OC_4,       0x0574,        OP_REG|OP_S4|OP_O4,     0,                        0                               },
    { m32rx_mvtaclo,  OC_1|OC_3|OC_4,       0x0575,        OP_REG|OP_S4|OP_O4,     0,                        0                               },
    { m32rx_sc,       OC_1|OC_2|OC_3|OC_4,  0x7401,        0,                      0,                        0                               },
    { m32rx_snc,      OC_1|OC_2|OC_3|OC_4,  0x7501,        0,                      0,                        0                               },
    { m32rx_jc,       OC_1|OC_2|OC_3,       0x01CC,        OP_REG|OP_S4|OP_O12,    0,                        0                               },
    { m32rx_jnc,      OC_1|OC_2|OC_3,       0x01DC,        OP_REG|OP_S4|OP_O12,    0,                        0                               },
    { m32rx_mulwhi,   OC_1|OC_3,            0x003A,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32rx_mulwlo,   OC_1|OC_3,            0x003B,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32rx_macwhi,   OC_1|OC_3,            0x003E,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32rx_macwlo,   OC_1|OC_3,            0x003F,        OP_REG|OP_S4|OP_O4,     OP_REG|OP_S4|OP_O12,      0                               },
    { m32rx_pcmpbz,   OC_1|OC_2|OC_3,       0x0037,        OP_REG|OP_S4|OP_O12,    0,                        0                               }
};

// get size of this operand (in bits)
inline static int get_size(const int op) {

    if (op & OP_S4)     return 4;
    if (op & OP_S8)     return 8;
    if (op & OP_S16)    return 16;
    if (op & OP_S24)    return 24;

    return 0;
}

// get size of this instruction (in bits)
inline static int get_op_size(const struct opcode *oc) {
    int s = 0;

    if (oc->opcode_flags & OC_1)    s += 4;
    if (oc->opcode_flags & OC_2)    s += 4;
    if (oc->opcode_flags & OC_3)    s += 4;
    if (oc->opcode_flags & OC_4)    s += 4;

    if (oc->op1 != 0)    s += get_size(oc->op1);
    if (oc->op2 != 0)    s += get_size(oc->op2);
    if (oc->op3 != 0)    s += get_size(oc->op3);

    return s;
}

// get value of target operand in target operation code
static int get_offset(const int word, const int word2, const int size, const int op) {

    if (op & OP_O4) {
        switch(size) {
            case 4:     return (word & 0x0F00) >> 8;
            default:    interr2("get_offset(): OP_O4 with size != 4 bits (%d)", size);
        }
    }
    if (op & OP_O8) {
        switch(size) {
            case 4:     return (word & 0x00F0) >> 4;
            case 8:     return word & 0x00FF;
            case 24:    return ((word & 0x00FF) << 16) + (word2 & 0xFFFF);
            default:    interr2("get_offset(): OP_O8 with size != 4, 8, 24 bits (%d)", size);
        }
    }
    if (op & OP_O12) {
        switch(size) {
            case 4:     return word & 0x000F;
            default:    interr2("get_offset(): OP_O12 with size != 4 bits (%d)", size);
        }
    }
    if (op & OP_O16) {
        switch(size) {
            case 16:    return word2 & 0xFFFF;
            default:    interr2("get_offset() : OP_O16 with size != 16 bits (%d)", size);
        }
    }

    interr("get_offset(): operand with unknown offset !");
    return 0;
}

// return the corresponding dt_xxx element for a specified size (in bits)
static inline int bits2dt(const int size) {
    switch(size) {
        case 4:     return dt_byte;
        case 8:     return dt_byte;
        case 16:    return dt_word;
        case 24:    return dt_dword;
    }

    interr2("bits2dt(): invalid size %d", size);
    return dt_void;
}

// swap 2 opcodes (o1 <=> o2)
static inline void swap_op(op_t &o1, op_t &o2) {
    op_t tmp = o1;
    o1 = o2;
    o2 = tmp;
}

// convert a general-purpose register to a control register
inline static int r2cr(const int reg) {
    switch (reg) {
        case rR0:   return rCR0;
        case rR1:   return rCR1;
        case rR2:   return rCR2;
        case rR3:   return rCR3;
        case rR6:   return rCR6;
    }

    interr2("r2cr(): invalid reg %d !", reg);
    return -1;
}

// initialize a register operand
inline void set_reg(op_t &op, int reg) {
    op.type = o_reg;
    op.reg = reg;
    // all m32r registers are 32 bits long
    op.dtyp = dt_word;
}

#define sign_extend(x) ( ( ( signed ) ( (x) << 8 ) ) >> 8 )

// fill a target cmd-operand structure with fresh data
static void set_arg(const int word, const int word2, op_t &op, const int oc) {

    int size = get_size(oc);
    int val = get_offset(word, word2, size, oc);

    if (oc & OP_REG) {
        set_reg(op, val);
    }
    else if (oc & OP_IMM) {
        op.type = o_imm;
        switch (size) {
            case 4:
            case 8:         op.value = (signed char) val;
                            break;
            case 16:        op.value = (signed short) val;
                            break;
            case 24:        op.value = val & 0x00ffffff;
                            break;
            default:        interr2("set_arg(): OP_IMM with size != 4, 8, 16, 24 (%d)", size);
        }
        op.dtyp = bits2dt(size);
    }
    else if (oc & OP_ADDR) {
        op.type = o_near;
        switch(size) {
            case 8:         op.addr = (signed char) val;
                            break;
            case 16:        op.addr = (signed short) val;
                            break;
            case 24:        op.addr = sign_extend(val);
                            break;
            default:        interr2( "set_arg(): OP_ADDR with size != 8, 16, 24 (%d)", size);
        }
        op.addr <<= 2;
        op.addr += cmd.ip & 0xfffffffc;
        op.dtyp = dt_code;
    }
    else if (oc & OP_PHRASE1) {     // @R
        op.type = o_phrase;
        op.specflag1 = fRI;
        op.reg = val;
    }
    else if (oc & OP_PHRASE2) {     // @R+
        op.type = o_phrase;
        op.specflag1 = fRIBA;
        op.reg = val;
    }
    else if (oc & OP_DISPL_A) {     // reg in @(imm, reg)
        op.type = o_displ;
        op.reg = val;
    }
    else if (oc & OP_DISPL_B) {     // imm in @(imm, reg)
        op.type = o_displ;
        op.addr = (signed short) val;
    }
    else if (oc & OP_PHRASE4) {     // @+R
        op.type = o_phrase;
        op.specflag1 = fRIAA;
        op.reg = val;
    }
    else if (oc & OP_PHRASE5) {     // @-R
        op.type = o_phrase;
        op.specflag1 = fRIAS;
        op.reg = val;
    }
    else {
        interr( "set_arg(): operand with unknow type!");
    }
}

static int get_code(const struct opcode *op, const int word) {
    int code = 0;

    if (op->opcode_flags & OC_1)     code = (code > 0 ? code * 0x10 : 0) + ((word & 0xF000) >> 12);
    if (op->opcode_flags & OC_2)     code = (code > 0 ? code * 0x10 : 0) + ((word & 0x0F00) >> 8);
    if (op->opcode_flags & OC_3)     code = (code > 0 ? code * 0x10 : 0) + ((word & 0x00F0) >> 4);
    if (op->opcode_flags & OC_4)     code = (code > 0 ? code * 0x10 : 0) + ((word & 0x000F) >> 0);

    return code;
}

// from the first picked word, scan the opcode table and return the corresponding entry (if exists)
static const struct opcode * get_opcode(int word) {
#if DEBUG
    msg("ANA: opcode 0x%X\n", word);
#endif

    for (int i = 0; i < qnumber(opcodes); i++) {
        if (opcodes[i].opcode_value == get_code(&opcodes[i], word))    return &opcodes[i];
    }

    if (ptype == prc_m32rx) {
        for (int i = 0; i < qnumber(ext_opcodes); i++) {
            if (ext_opcodes[i].opcode_value == get_code(&ext_opcodes[i], word))    return &ext_opcodes[i];
        }
    }
    else msg("ANA: %d not m32rx...\n", ptype);

    return NULL;
}

// analyze a special instruction
bool ana_special(int word, int *s) {
    bool special = false;

    // srli, srai, and slli are 3 special instructions, with this kind of opcode format :
    // 0101 dest 000 imm5 (SRLI)
    // 0101 dest 001 imm5 (SRAI)
    // 0101 dest 010 imm5 (SLLI)
    if (((word & 0xF000) >> 12) == 5) {
        int imm5 = word & 0x1F;
        int reg = (word & 0x0F00) >> 8;
        switch ((word & /*0x0070*/ 0x00F0) >> 5) {
            case 0:
                special = true;
                cmd.itype = m32r_srli;
                break;
            case 1:
                special = true;
                cmd.itype = m32r_srai;
                break;
            case 2:
                special = true;
                cmd.itype = m32r_slli;
                break;
        }
        if (special) {
            cmd.Op1.type = o_reg;
            cmd.Op1.reg = reg;
            cmd.Op2.type = o_imm;
            cmd.Op2.value = imm5;
#if DEBUG
            msg("ANA: special shift instruction %s detected\n", Instructions[cmd.itype]);
#endif
            *s = 16;
            return true;
        }
    }

    // detect m32rx rac/rach instructions
    if (ptype == prc_m32rx) {

        int v = (word & 0x00F0) >> 4;
        int itype = (v == 9 ? m32rx_rac : v == 8 ? m32rx_rach : -1);

        if (itype == -1)
            return false;

        switch (word & 0xFF0F) {
            // rac[h] a1
            case 0x5400:
                set_reg(cmd.Op1, rA1);
                special = true;
                break;

            // rac[h] a0, a1
            case 0x5004:
                set_reg(cmd.Op1, rA0);
                set_reg(cmd.Op2, rA1);
                special = true;
                break;

            // rac[h] a1, a1
            case 0x5404:
                set_reg(cmd.Op1, rA1);
                set_reg(cmd.Op2, rA1);
                special = true;
                break;

            // rac[h] a0, a1, #2
            case 0x5005:
                set_reg(cmd.Op1, rA0);
                set_reg(cmd.Op2, rA1);
                cmd.Op3.type = o_imm;
                cmd.Op3.value = 2;
                cmd.Op3.dtyp = dt_byte;
                special = true;
                break;

            // rac[h] a1, a0, #2
            case 0x5401:
                set_reg(cmd.Op1, rA1);
                set_reg(cmd.Op2, rA0);
                cmd.Op3.type = o_imm;
                cmd.Op3.value = 2;
                cmd.Op3.dtyp = dt_byte;
                special = true;
                break;
        }

        if (special) {
#if DEBUG
            msg("ANA: detected special m32rx rac[h] insn!\n");
#endif
            cmd.itype = itype;
            return true;
        }
    }

    return false;
}

// analyze an instruction
int ana(void) {

    int word, word2 = 0, s = 0;

    word = ua_next_word();

    // if the MSB if 1 and the current address NOT divisible by 4, then remove the MSB
    if (((word & 0x8000) >> 15) == 1) {
        if (cmd.ea % 4 != 0) {
#if DEBUG
            msg("0x%a => removing MSB for 0x%X !\n", cmd.ea, word);
#endif
            word &= 0x7FFF;
        }
    }

    bool special = ana_special(word, &s);

    if (!special) {

        // retreive the corresponding opcode struct entry
        const struct opcode *oc = get_opcode(word);
        if (oc == NULL) {
            // second try without the MSB
            //oc = get_opcode(word & 0x7FFF);
            //if (oc == NULL) {
#if DEBUG
                msg("ANA: 0x%X unmatched instruction\n", word);
#endif
                return 0;
            //}
        }

        // fill the insn name
        cmd.itype = oc->instruction;

#if DEBUG
        msg("ANA: Analysing %s (0x%X)\n", Instructions[oc->instruction], word);
#endif

        // compute the size of our operation code
        s = get_op_size(oc);

#if DEBUG
        msg("ANA: size %d bits (%d %d %d)\n", s, get_size(oc->op1), get_size(oc->op2), get_size(oc->op3));
#endif

        // size must be either 16 or 32 bits long
        if (s != 16 && s != 32) {
            interr2("size of operand != 16 or 32 (%d)", s);
            return 0;
        }

        // 32 bits ? we need to pick an another word
        if (s == 32) {
#if DEBUG
            msg("ANA: picked an another word\n");
#endif
            word2 = ua_next_word();
        }

        // those '16-bit' instructions are always followed by an another word
        // (which is specified in the array).
        // this code will check if the next word has the right value, according
        // to the current instruction.

        struct {
            int insn;
            int word;
        } sinsn[] = {
            { m32r_div,      0x0000     },
            { m32r_divu,     0x0000     },
            { m32r_rem,      0x0000     },
            { m32r_remu,     0x0000     },
            { m32rx_sat,     0x0000     },
            { m32rx_satb,    0x0300     },
            { m32rx_sath,    0x0200     },
            { m32rx_divh,    0x0010     }
        };

        if (s == 16) {
            for (int i = 0; i < qnumber(sinsn); i++) {
                if (sinsn[i].insn != cmd.itype)
                    continue;

                word2 = get_word(cmd.ea + 2);
                if (word2 != sinsn[i].word) {

                    // second chance for div
                    if (cmd.itype == m32r_div) {
                        cmd.itype = m32rx_divh;
                        continue;
                    }

                    // second chance for sat
                    if (cmd.itype == m32rx_sat) {
                        cmd.itype = m32rx_satb;
                        continue;
                    }

                    // second chance for satb
                    if (cmd.itype == m32rx_satb) {
                        cmd.itype = m32rx_sath;
                        continue;
                    }

#if DEBUG
                    msg("ANA: next word '0x%X' is not equal to '0x%X'\n",
                        word2, sinsn[i].word);
#endif
                    return 0;
                }
                word2 = ua_next_word();
                s += 16;
                break;
            }
        }

        // fill the appropriate operands of the cmd structure
        if (oc->op1 != 0)     set_arg(word, word2, cmd.Op1, oc->op1);
        if (oc->op2 != 0)     set_arg(word, word2, cmd.Op2, oc->op2);
        if (oc->op3 != 0) {
            // @(imm, reg) : fill the second operand
            if (oc->op3 & OP_DISPL_B) {
                set_arg(word, word2, cmd.Op2, oc->op3);
            }
            else {
                set_arg(word, word2, cmd.Op3, oc->op3);
            }
        }

        // Additionnal code
        switch (oc->instruction) {
            // instructions mvfc - mvtc uses control registers
            case m32r_mvfc:   cmd.Op2.reg = r2cr(cmd.Op2.reg);
                              break;
            case m32r_mvtc:   swap_op(cmd.Op1, cmd.Op2);
                              cmd.Op2.reg = r2cr(cmd.Op2.reg);
                              break;

            // some of the m32rx instructions uses accumulator registers
            case m32rx_mulhi:
            case m32rx_mullo:
            case m32rx_machi:
            case m32rx_maclo:
            case m32rx_mvfachi:
            case m32rx_mvfaclo:
            case m32rx_mvfacmi:
            case m32rx_mvtachi:
            case m32rx_mvtaclo:
            case m32rx_mulwhi:
            case m32rx_mulwlo:
            case m32rx_macwhi:
            case m32rx_macwlo:
                cmd.Op3.type = o_reg;
                cmd.Op3.reg = rA1;        // this is the default
                cmd.Op3.dtyp = dt_dword;
                break;

            // synthetic instructions
            case m32r_bc:
            case m32r_bl:
            case m32r_bnc:
            case m32r_bra:
            case m32r_ldi:    cmd.segpref |= (s == 16 ? SYNTHETIC_SHORT : SYNTHETIC_LONG);
                              break;

            case m32r_st:     if (cmd.Op2.specflag1 == fRIAS && cmd.Op2.reg == rSP) {
                                    cmd.itype = (use_synthetic_insn() ? m32r_push : m32r_st);
                                    cmd.Op2.type = (use_synthetic_insn() ? o_void : o_phrase);
                              }
                              break;
            case m32r_ld:     if (cmd.Op2.specflag1 == fRIBA && cmd.Op2.reg == rSP) {
                                    cmd.itype = (use_synthetic_insn() ? m32r_pop : m32r_ld);
                                    cmd.Op2.type = (use_synthetic_insn() ? o_void : o_phrase);
                              }
                              break;
        }
    }

    // detect parallel NOP / DSP instructions
    if (s == 16) {
        int b = get_word(cmd.ea + cmd.size);

        //if (((b >> 12) & 1) == 1) {
        if (((b & 0x8FFF) >> 15) == 1) {

            // next opcode is NOP
            if (b == 0xF000) {
                cmd.size += 2;
                cmd.segpref |= NEXT_INSN_PARALLEL_NOP;
            }
            // this opcode is NOP, the next should be a DSP insn
            else if (word == 0x7000) {
                // recall the analyzer (and therefore erase the current NOP)
                ana();
                // flag the DSP instruction
                cmd.segpref |= NEXT_INSN_PARALLEL_DSP;
            }
            // we don't know what is the next insn, but we are sure it is //

            else {
                insn_t old_cmd = cmd;

                ua_ana0(cmd.ea + cmd.size);
                if (cmd.size == 2)
                    old_cmd.segpref |= NEXT_INSN_PARALLEL_OTHER;

                cmd = old_cmd;
            }
        }
    }

    return cmd.size;
}

void do_interr(const char *file, const int line, const char *message, ...) {
    const char *name = NULL;
    char b[200];
    va_list va;

    va_start(va, message);

    if (cmd.itype < m32r_last) {
        name = Instructions[cmd.itype].name;
    }
    else {
        cmd.itype = m32r_null;
    }

    qvsnprintf(b, sizeof b, message, va);

    warning("%s:%d : %a(%s) : internal error => %s",
        file, line, cmd.ea, name, b);

    va_end(va);
}

