source: trunk/libs/newlib/src/include/opcode/msp430-decode.h @ 507

/* Opcode decoder for the TI MSP430
   Copyright 2012-2013 Free Software Foundation, Inc.
   Written by DJ Delorie <dj@redhat.com>

   This file is part of GDB, the GNU Debugger.

   This program 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 of the License, or
   (at your option) any later version.

   This program 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 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.  */

typedef enum
{
  MSO_unknown,
  /* Double-operand instructions - all repeat .REPEATS times. */
  MSO_mov,      /* dest = src */
  MSO_add,      /* dest += src */
  MSO_addc,     /* dest += src + carry */
  MSO_subc,     /* dest -= (src-1) + carry */
  MSO_sub,      /* dest -= src */
  MSO_cmp,      /* dest - src -> status */
  MSO_dadd,     /* dest += src (as BCD) */
  MSO_bit,      /* dest & src -> status */
  MSO_bic,      /* dest &= ~src (bit clear) */
  MSO_bis,      /* dest |= src (bit set, OR) */
  MSO_xor,      /* dest ^= src */
  MSO_and,      /* dest &= src */

  /* Single-operand instructions.  */
  MSO_rrc,      /* Rotate through carry, dest >>= .REPEATS.  */
  MSO_swpb,     /* Swap lower bytes of operand.  */
  MSO_rra,      /* Signed shift dest >>= .REPEATS.  */
  MSO_sxt,      /* Sign extend lower byte.  */
  MSO_push,     /* Push .REPEATS registers (or other op) starting at SRC going towards R0.  */
  MSO_pop,      /* Pop .REPEATS registers starting at DEST going towards R15.  */
  MSO_call,
  MSO_reti,

  /* Jumps.  */
  MSO_jmp,      /* PC = SRC if .COND true.  */

  /* Extended single-operand instructions.  */
  MSO_rru,      /* Unsigned shift right, dest >>= .REPEATS.  */

} MSP430_Opcode_ID;

typedef enum
{
  MSP430_Operand_None,
  MSP430_Operand_Immediate,
  MSP430_Operand_Register,
  MSP430_Operand_Indirect,
  MSP430_Operand_Indirect_Postinc
} MSP430_Operand_Type;

typedef enum
{
  MSR_0 = 0,
  MSR_PC = 0,
  MSR_SP = 1,
  MSR_SR = 2,
  MSR_CG = 3,
  MSR_None = 16,
} MSP430_Register;

typedef struct
{
  MSP430_Operand_Type  type;
  int                  addend;
  MSP430_Register      reg : 8;
  MSP430_Register      reg2 : 8;
  unsigned char        bit_number : 4;
  unsigned char        condition : 3;
} MSP430_Opcode_Operand;

typedef enum
{
  MSP430_Byte = 0,
  MSP430_Word,
  MSP430_Addr
} MSP430_Size;

/* These numerically match the bit encoding.  */
typedef enum
{
  MSC_nz = 0,
  MSC_z,
  MSC_nc,
  MSC_c,
  MSC_n,
  MSC_ge,
  MSC_l,
  MSC_true,
} MSP430_Condition;

#define MSP430_FLAG_C   0x01
#define MSP430_FLAG_Z   0x02
#define MSP430_FLAG_N   0x04
#define MSP430_FLAG_V   0x80

typedef struct
{
  int lineno;
  MSP430_Opcode_ID      id;
  unsigned              flags_1:8;      /* These flags are set to '1' by the insn.  */
  unsigned              flags_0:8;      /* These flags are set to '0' by the insn.  */
  unsigned              flags_set:8;    /* These flags are set appropriately by the insn.  */
  unsigned              zc:1;           /* If set, pretend the carry bit is zero.  */
  unsigned              repeat_reg:1;   /* If set, count is in REG[repeats].  */
  unsigned              ofs_430x:1;     /* If set, the offset in any operand is 430x (else use 430 compatibility mode).  */
  unsigned              repeats:5;      /* Contains COUNT-1, or register number.  */
  int                   n_bytes;        /* Opcode size in BYTES.  */
  char *                syntax;
  MSP430_Size           size;           /* Operand size in BITS.  */
  MSP430_Condition      cond;
  /* By convention, these are [0]destination, [1]source.  */
  MSP430_Opcode_Operand op[2];
} MSP430_Opcode_Decoded;

int msp430_decode_opcode (unsigned long, MSP430_Opcode_Decoded *, int (*)(void *), void *);