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  1. /* Opcode decoder for the TI MSP430
  2.    Copyright 2012-2013 Free Software Foundation, Inc.
  3.    Written by DJ Delorie <dj@redhat.com>
  4.  
  5.    This file is part of GDB, the GNU Debugger.
  6.  
  7.    This program is free software; you can redistribute it and/or modify
  8.    it under the terms of the GNU General Public License as published by
  9.    the Free Software Foundation; either version 3 of the License, or
  10.    (at your option) any later version.
  11.  
  12.    This program is distributed in the hope that it will be useful,
  13.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15.    GNU General Public License for more details.
  16.  
  17.    You should have received a copy of the GNU General Public License
  18.    along with this program; if not, write to the Free Software
  19.    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
  20.    02110-1301, USA.  */
  21.  
  22. typedef enum
  23. {
  24.   MSO_unknown,
  25.   /* Double-operand instructions - all repeat .REPEATS times. */
  26.   MSO_mov,      /* dest = src */
  27.   MSO_add,      /* dest += src */
  28.   MSO_addc,     /* dest += src + carry */
  29.   MSO_subc,     /* dest -= (src-1) + carry */
  30.   MSO_sub,      /* dest -= src */
  31.   MSO_cmp,      /* dest - src -> status */
  32.   MSO_dadd,     /* dest += src (as BCD) */
  33.   MSO_bit,      /* dest & src -> status */
  34.   MSO_bic,      /* dest &= ~src (bit clear) */
  35.   MSO_bis,      /* dest |= src (bit set, OR) */
  36.   MSO_xor,      /* dest ^= src */
  37.   MSO_and,      /* dest &= src */
  38.  
  39.   /* Single-operand instructions.  */
  40.   MSO_rrc,      /* Rotate through carry, dest >>= .REPEATS.  */
  41.   MSO_swpb,     /* Swap lower bytes of operand.  */
  42.   MSO_rra,      /* Signed shift dest >>= .REPEATS.  */
  43.   MSO_sxt,      /* Sign extend lower byte.  */
  44.   MSO_push,     /* Push .REPEATS registers (or other op) starting at SRC going towards R0.  */
  45.   MSO_pop,      /* Pop .REPEATS registers starting at DEST going towards R15.  */
  46.   MSO_call,
  47.   MSO_reti,
  48.  
  49.   /* Jumps.  */
  50.   MSO_jmp,      /* PC = SRC if .COND true.  */
  51.  
  52.   /* Extended single-operand instructions.  */
  53.   MSO_rru,      /* Unsigned shift right, dest >>= .REPEATS.  */
  54.  
  55. } MSP430_Opcode_ID;
  56.  
  57. typedef enum
  58. {
  59.   MSP430_Operand_None,
  60.   MSP430_Operand_Immediate,
  61.   MSP430_Operand_Register,
  62.   MSP430_Operand_Indirect,
  63.   MSP430_Operand_Indirect_Postinc
  64. } MSP430_Operand_Type;
  65.  
  66. typedef enum
  67. {
  68.   MSR_0 = 0,
  69.   MSR_PC = 0,
  70.   MSR_SP = 1,
  71.   MSR_SR = 2,
  72.   MSR_CG = 3,
  73.   MSR_None = 16,
  74. } MSP430_Register;
  75.  
  76. typedef struct
  77. {
  78.   MSP430_Operand_Type  type;
  79.   int                  addend;
  80.   MSP430_Register      reg : 8;
  81.   MSP430_Register      reg2 : 8;
  82.   unsigned char        bit_number : 4;
  83.   unsigned char        condition : 3;
  84. } MSP430_Opcode_Operand;
  85.  
  86. typedef enum
  87. {
  88.   MSP430_Byte = 0,
  89.   MSP430_Word,
  90.   MSP430_Addr
  91. } MSP430_Size;
  92.  
  93. /* These numerically match the bit encoding.  */
  94. typedef enum
  95. {
  96.   MSC_nz = 0,
  97.   MSC_z,
  98.   MSC_nc,
  99.   MSC_c,
  100.   MSC_n,
  101.   MSC_ge,
  102.   MSC_l,
  103.   MSC_true,
  104. } MSP430_Condition;
  105.  
  106. #define MSP430_FLAG_C   0x01
  107. #define MSP430_FLAG_Z   0x02
  108. #define MSP430_FLAG_N   0x04
  109. #define MSP430_FLAG_V   0x80
  110.  
  111. typedef struct
  112. {
  113.   int lineno;
  114.   MSP430_Opcode_ID      id;
  115.   unsigned              flags_1:8;      /* These flags are set to '1' by the insn.  */
  116.   unsigned              flags_0:8;      /* These flags are set to '0' by the insn.  */
  117.   unsigned              flags_set:8;    /* These flags are set appropriately by the insn.  */
  118.   unsigned              zc:1;           /* If set, pretend the carry bit is zero.  */
  119.   unsigned              repeat_reg:1;   /* If set, count is in REG[repeats].  */
  120.   unsigned              ofs_430x:1;     /* If set, the offset in any operand is 430x (else use 430 compatibility mode).  */
  121.   unsigned              repeats:5;      /* Contains COUNT-1, or register number.  */
  122.   int                   n_bytes;        /* Opcode size in BYTES.  */
  123.   char *                syntax;
  124.   MSP430_Size           size;           /* Operand size in BITS.  */
  125.   MSP430_Condition      cond;
  126.   /* By convention, these are [0]destination, [1]source.  */
  127.   MSP430_Opcode_Operand op[2];
  128. } MSP430_Opcode_Decoded;
  129.  
  130. int msp430_decode_opcode (unsigned long, MSP430_Opcode_Decoded *, int (*)(void *), void *);
  131.