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/* cr16.h -- Header file for CR16 opcode and register tables.

   Copyright (C) 2007-2015 Free Software Foundation, Inc.

   Contributed by M R Swami Reddy

   This file is part of GAS, GDB and the GNU binutils.

   GAS, GDB, and GNU binutils is free software; you can redistribute it

   and/or modify it under the terms of the GNU General Public License as

   published by the Free Software Foundation; either version 3, or (at your

   option) any later version.

   GAS, GDB, and GNU binutils are distributed in the hope that they will be

   useful, but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software Foundation,

   Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

#ifndef _CR16_H_

#define _CR16_H_

/* CR16 core Registers :

   The enums are used as indices to CR16 registers table (cr16_regtab).

   Therefore, order MUST be preserved.  */

typedef enum

{

  /* 16-bit general purpose registers.  */

  r0, r1, r2, r3,

  r4, r5, r6, r7,

  r8, r9, r10, r11,

  r12_L = 12, r13_L = 13, ra = 14, sp_L = 15,

  /* 32-bit general purpose registers.  */

  r12 = 12, r13 = 13, r14 = 14, r15 = 15,

  era = 14, sp = 15, RA,

  /* Not a register.  */

  nullregister,

  MAX_REG

}

reg;

/* CR16 processor registers and special registers :

   The enums are used as indices to CR16 processor registers table

   (cr16_pregtab). Therefore, order MUST be preserved.  */

typedef enum

{

  /* processor registers.  */

  dbs = MAX_REG,

  dsr, dcrl, dcrh,

  car0l, car0h, car1l, car1h,

  cfg, psr, intbasel, intbaseh,

  ispl, isph, uspl, usph,

  dcr =  dcrl,

  car0 = car0l,

  car1 = car1l,

  intbase = intbasel,

  isp =  ispl,

  usp =  uspl,

  /* Not a processor register.  */

  nullpregister = usph + 1,

  MAX_PREG

}

preg;

/* CR16 Register types. */

typedef enum

{

  CR16_R_REGTYPE,    /* r      */

  CR16_RP_REGTYPE,   /* reg pair  */

  CR16_P_REGTYPE     /* Processor register  */

}

reg_type;

/* CR16 argument types :

   The argument types correspond to instructions operands

   Argument types :

   r - register

   rp - register pair

   c - constant

   i - immediate

   idxr - index with register

   idxrp - index with register pair

   rbase - register base

   rpbase - register pair base

   pr - processor register.  */

typedef enum

{

  arg_r,

  arg_c,

  arg_cr,

  arg_crp,

  arg_ic,

  arg_icr,

  arg_idxr,

  arg_idxrp,

  arg_rbase,

  arg_rpbase,

  arg_rp,

  arg_pr,

  arg_prp,

  arg_cc,

  arg_ra,

  /* Not an argument.  */

  nullargs

}

argtype;

/* CR16 operand types:The operand types correspond to instructions operands.  */

typedef enum

{

  dummy,

  /* N-bit signed immediate.  */

  imm3, imm4, imm5, imm6, imm16, imm20, imm32,

  /* N-bit unsigned immediate.  */

  uimm3, uimm3_1, uimm4, uimm4_1, uimm5, uimm16, uimm20, uimm32,

  /* N-bit signed displacement.  */

  disps5, disps17, disps25,

  /* N-bit unsigned displacement.  */

  dispe9,

  /* N-bit absolute address.  */

  abs20, abs24,

  /* Register relative.  */

  rra, rbase, rbase_disps20, rbase_dispe20,

  /* Register pair relative.  */

  rpbase_disps0, rpbase_dispe4, rpbase_disps4, rpbase_disps16,

  rpbase_disps20, rpbase_dispe20,

  /* Register index.  */

  rindex7_abs20, rindex8_abs20,

  /* Register pair index.  */

  rpindex_disps0, rpindex_disps14, rpindex_disps20,

  /* register.  */

  regr,

  /* register pair.  */

  regp,

  /* processor register.  */

  pregr,

  /* processor register 32 bit.  */

  pregrp,

  /* condition code - 4 bit.  */

  cc,

  /* Not an operand.  */

  nulloperand,

  /* Maximum supported operand.  */

  MAX_OPRD

}

operand_type;

/* CR16 instruction types.  */

#define NO_TYPE_INS       0

#define ARITH_INS         1

#define LD_STOR_INS       2

#define BRANCH_INS        3

#define ARITH_BYTE_INS    4

#define SHIFT_INS         5

#define BRANCH_NEQ_INS    6

#define LD_STOR_INS_INC   7

#define STOR_IMM_INS      8

#define CSTBIT_INS        9

/* Maximum value supported for instruction types.  */

#define CR16_INS_MAX        (1 << 4)

/* Mask to record an instruction type.  */

#define CR16_INS_MASK       (CR16_INS_MAX - 1)

/* Return instruction type, given instruction's attributes.  */

#define CR16_INS_TYPE(attr) ((attr) & CR16_INS_MASK)

/* Indicates whether this instruction has a register list as parameter.  */

#define REG_LIST        CR16_INS_MAX

/* The operands in binary and assembly are placed in reverse order.

   load - (REVERSE_MATCH)/store - (! REVERSE_MATCH).  */

#define REVERSE_MATCH  (1 << 5)

/* Printing formats, where the instruction prefix isn't consecutive.  */

#define FMT_1          (1 << 9)    /* 0xF0F00000 */

#define FMT_2          (1 << 10)   /* 0xFFF0FF00 */

#define FMT_3          (1 << 11)   /* 0xFFF00F00 */

#define FMT_4          (1 << 12)   /* 0xFFF0F000 */

#define FMT_5          (1 << 13)   /* 0xFFF0FFF0 */

#define FMT_CR16       (FMT_1 | FMT_2 | FMT_3 | FMT_4 | FMT_5)

/* Indicates whether this instruction can be relaxed.  */

#define RELAXABLE      (1 << 14)

/* Indicates that instruction uses user registers (and not

   general-purpose registers) as operands.  */

#define USER_REG       (1 << 15)

/* Instruction shouldn't allow 'sp' usage.  */

#define NO_SP          (1 << 17)

/* Instruction shouldn't allow to push a register which is used as a rptr.  */

#define NO_RPTR        (1 << 18)

/* Maximum operands per instruction.  */

#define MAX_OPERANDS     5

/* Maximum register name length. */

#define MAX_REGNAME_LEN  10

/* Maximum instruction length. */

#define MAX_INST_LEN     256

/* Values defined for the flags field of a struct operand_entry.  */

/* Operand must be an unsigned number.  */

#define OP_UNSIGNED   (1 << 0)

/* Operand must be a signed number.  */

#define OP_SIGNED     (1 << 1)

/* Operand must be a negative number.  */

#define OP_NEG        (1 << 2)

/* A special load/stor 4-bit unsigned displacement operand.  */

#define OP_DEC        (1 << 3)

/* Operand must be an even number.  */

#define OP_EVEN       (1 << 4)

/* Operand is shifted right.  */

#define OP_SHIFT      (1 << 5)

/* Operand is shifted right and decremented.  */

#define OP_SHIFT_DEC  (1 << 6)

/* Operand has reserved escape sequences.  */

#define OP_ESC        (1 << 7)

/* Operand must be a ABS20 number.  */

#define OP_ABS20      (1 << 8)

/* Operand must be a ABS24 number.  */

#define OP_ABS24      (1 << 9)

/* Operand has reserved escape sequences type 1.  */

#define OP_ESC1       (1 << 10)

/* Single operand description.  */

typedef struct

{

  /* Operand type.  */

  operand_type op_type;

  /* Operand location within the opcode.  */

  unsigned int shift;

}

operand_desc;

/* Instruction data structure used in instruction table.  */

typedef struct

{

  /* Name.  */

  const char *mnemonic;

  /* Size (in words).  */

  unsigned int size;

  /* Constant prefix (matched by the disassembler).  */

  unsigned long match;  /* ie opcode */

  /* Match size (in bits).  */

  /* MASK: if( (i & match_bits) == match ) then match */

  int match_bits;

  /* Attributes.  */

  unsigned int flags;

  /* Operands (always last, so unreferenced operands are initialized).  */

  operand_desc operands[MAX_OPERANDS];

}

inst;

/* Data structure for a single instruction's arguments (Operands).  */

typedef struct

{

  /* Register or base register.  */

  reg r;

  /* Register pair register.  */

  reg rp;

  /* Index register.  */

  reg i_r;

  /* Processor register.  */

  preg pr;

  /* Processor register. 32 bit  */

  preg prp;

  /* Constant/immediate/absolute value.  */

  long constant;

  /* CC code.  */

  unsigned int cc;

  /* Scaled index mode.  */

  unsigned int scale;

  /* Argument type.  */

  argtype type;

  /* Size of the argument (in bits) required to represent.  */

  int size;

  /* The type of the expression.  */

  unsigned char X_op;

}

argument;

/* Internal structure to hold the various entities

   corresponding to the current assembling instruction.  */

typedef struct

{

  /* Number of arguments.  */

  int nargs;

  /* The argument data structure for storing args (operands).  */

  argument arg[MAX_OPERANDS];

/* The following fields are required only by CR16-assembler.  */

#ifdef TC_CR16

  /* Expression used for setting the fixups (if any).  */

  expressionS exp;

  bfd_reloc_code_real_type rtype;

#endif /* TC_CR16 */

  /* Instruction size (in bytes).  */

  int size;

}

ins;

/* Structure to hold information about predefined operands.  */

typedef struct

{

  /* Size (in bits).  */

  unsigned int bit_size;

  /* Argument type.  */

  argtype arg_type;

  /* One bit syntax flags.  */

  int flags;

}

operand_entry;

/* Structure to hold trap handler information.  */

typedef struct

{

  /* Trap name.  */

  char *name;

  /* Index in dispatch table.  */

  unsigned int entry;

}

trap_entry;

/* Structure to hold information about predefined registers.  */

typedef struct

{

  /* Name (string representation).  */

  char *name;

  /* Value (enum representation).  */

  union

  {

    /* Register.  */

    reg reg_val;

    /* processor register.  */

    preg preg_val;

  } value;

  /* Register image.  */

  int image;

  /* Register type.  */

  reg_type type;

}

reg_entry;

/* CR16 opcode table.  */

extern const inst cr16_instruction[];

extern const unsigned int cr16_num_opcodes;

#define NUMOPCODES cr16_num_opcodes

/* CR16 operands table.  */

extern const operand_entry cr16_optab[];

extern const unsigned int cr16_num_optab;

/* CR16 registers table.  */

extern const reg_entry cr16_regtab[];

extern const unsigned int cr16_num_regs;

#define NUMREGS cr16_num_regs

/* CR16 register pair table.  */

extern const reg_entry cr16_regptab[];

extern const unsigned int cr16_num_regps;

#define NUMREGPS cr16_num_regps

/* CR16 processor registers table.  */

extern const reg_entry cr16_pregtab[];

extern const unsigned int cr16_num_pregs;

#define NUMPREGS cr16_num_pregs

/* CR16 processor registers - 32 bit table.  */

extern const reg_entry cr16_pregptab[];

extern const unsigned int cr16_num_pregps;

#define NUMPREGPS cr16_num_pregps

/* CR16 trap/interrupt table.  */

extern const trap_entry cr16_traps[];

extern const unsigned int cr16_num_traps;

#define NUMTRAPS cr16_num_traps

/* CR16 CC - codes bit table.  */

extern const char * cr16_b_cond_tab[];

extern const unsigned int cr16_num_cc;

#define NUMCC cr16_num_cc;

/* Table of instructions with no operands.  */

extern const char * cr16_no_op_insn[];

/* Current instruction we're assembling.  */

extern const inst *instruction;

/* A macro for representing the instruction "constant" opcode, that is,

   the FIXED part of the instruction. The "constant" opcode is represented

   as a 32-bit unsigned long, where OPC is expanded (by a left SHIFT)

   over that range.  */

#define BIN(OPC,SHIFT)        (OPC << SHIFT)

/* Is the current instruction type is TYPE ?  */

#define IS_INSN_TYPE(TYPE)              \

  (CR16_INS_TYPE (instruction->flags) == TYPE)

/* Is the current instruction mnemonic is MNEMONIC ?  */

#define IS_INSN_MNEMONIC(MNEMONIC)    \

  (strcmp (instruction->mnemonic, MNEMONIC) == 0)

/* Does the current instruction has register list ?  */

#define INST_HAS_REG_LIST              \

  (instruction->flags & REG_LIST)

/* Utility macros for string comparison.  */

#define streq(a, b)           (strcmp (a, b) == 0)

#define strneq(a, b, c)       (strncmp (a, b, c) == 0)

/* Long long type handling.  */

/* Replace all appearances of 'long long int' with LONGLONG.  */

typedef long long int LONGLONG;

typedef unsigned long long ULONGLONG;

/* Data types for opcode handling.  */

typedef unsigned long dwordU;

typedef unsigned short wordU;

/* Globals to store opcode data and build the instruction.  */

extern wordU cr16_words[3];

extern ULONGLONG cr16_allWords;

extern ins cr16_currInsn;

/* Prototypes for function in cr16-dis.c.  */

extern void cr16_make_instruction (void);

extern int  cr16_match_opcode (void);

#endif /* _CR16_H_ */