| 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 *); |
|---|
