common.h

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// SPDX-FileCopyrightText: 2022 Dhruv Maroo <dhruvmaru007@gmail.com>
// SPDX-License-Identifier: LGPL-3.0-only
 
#ifndef RZ_SH_COMMON_H
#define RZ_SH_COMMON_H
 
#include "disassembler.h"
 
struct sh_param_builder_addr_t {
    ut8 start; 
    st8 bits; 
    SHAddrMode mode; 
};
 
typedef struct sh_param_builder_t {
    // either find the param using param builder or use an already provided param
    union {
        struct sh_param_builder_addr_t addr;
        SHParam param;
    };
    bool is_param; 
} SHParamBuilder;
 
typedef struct sh_op_raw_t {
    const char *str_mnem; 
    SHOpMnem mnemonic; 
    ut16 opcode; 
    ut16 mask; 
    SHScaling scaling; 
    SHParamBuilder param_builder[2]; 
} SHOpRaw;
 
// xxxx used to denote param fields in the opcode
#define I f
#define N f
#define D f
#define M f
 
// to form opcode in nibbles
#define OPCODE_(a, b, c, d) 0x##a##b##c##d
#define OPCODE(a, b, c, d)  OPCODE_(a, b, c, d)
 
// nibble position
#define NIB0 0
#define NIB1 4
#define NIB2 8
#define NIB3 12
 
// return a param builder struct
#define ADDR(nib, addrmode) \
    { \
        { .addr = { .start = nib, .bits = -1, .mode = addrmode } }, .is_param = false \
    }
 
// return a param builder struct with custom bit read length
#define ADDRBITS(nib, addrmode, b) \
    { \
        { .addr = { .start = nib, .bits = b, .mode = addrmode } }, .is_param = false \
    }
 
// return a param
#define PARAM(reg, addrmode) \
    { { .param = { .param = { \
                   SH_REG_IND_##reg, \
               }, \
            .mode = addrmode } }, \
        .is_param = true }
 
// opcode for "weird" movl
#define MOVL 0x1fff
 
#define NOPARAM ADDR(NIB0, SH_ADDR_INVALID)
 
#endif // RZ_SH_COMMON_H