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/* Opcode decoder for the TI MSP430
Copyright (C) 2012-2015 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. */
#ifdef __cplusplus
extern "C" {
#endif
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 *);
#ifdef __cplusplus
}
#endif
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