Subversion Repositories Kolibri OS

/* Opcode decoder for the Renesas RX

   Copyright 2008, 2009, 2010

   Free Software Foundation, Inc.

   Written by DJ Delorie 

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

   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.  */

/* The RX decoder in libopcodes is used by the simulator, gdb's

   analyzer, and the disassembler.  Given an opcode data source,

   it decodes the next opcode into the following structures.  */

typedef enum

{

  RX_AnySize = 0,

  RX_Byte, /* undefined extension */

  RX_UByte,

  RX_SByte,

  RX_Word, /* undefined extension */

  RX_UWord,

  RX_SWord,

  RX_3Byte,

  RX_Long,

} RX_Size;

typedef enum

{

  RX_Operand_None,

  RX_Operand_Immediate,	/* #addend */

  RX_Operand_Register,	/* Rn */

  RX_Operand_Indirect,	/* [Rn + addend] */

  RX_Operand_Postinc,	/* [Rn+] */

  RX_Operand_Predec,	/* [-Rn] */

  RX_Operand_Condition,	/* eq, gtu, etc */

  RX_Operand_Flag,	/* [UIOSZC] */

  RX_Operand_TwoReg,	/* [Rn + scale*R2] */

} RX_Operand_Type;

typedef enum

{

  RXO_unknown,

  RXO_mov,	/* d = s (signed) */

  RXO_movbi,	/* d = [s,s2] (signed) */

  RXO_movbir,	/* [s,s2] = d (signed) */

  RXO_pushm,	/* s..s2 */

  RXO_popm,	/* s..s2 */

  RXO_xchg,	/* s <-> d */

  RXO_stcc,	/* d = s if cond(s2) */

  RXO_rtsd,	/* rtsd, 1=imm, 2-0 = reg if reg type */

  /* These are all either d OP= s or, if s2 is set, d = s OP s2.  Note

     that d may be "None".  */

  RXO_and,

  RXO_or,

  RXO_xor,

  RXO_add,

  RXO_sub,

  RXO_mul,

  RXO_div,

  RXO_divu,

  RXO_shll,

  RXO_shar,

  RXO_shlr,

  RXO_adc,	/* d = d + s + carry */

  RXO_sbb,	/* d = d - s - ~carry */

  RXO_abs,	/* d = |s| */

  RXO_max,	/* d = max(d,s) */

  RXO_min,	/* d = min(d,s) */

  RXO_emul,	/* d:64 = d:32 * s */

  RXO_emulu,	/* d:64 = d:32 * s (unsigned) */

  RXO_rolc,	/* d <<= 1 through carry */

  RXO_rorc,	/* d >>= 1 through carry*/

  RXO_rotl,	/* d <<= #s without carry */

  RXO_rotr,	/* d >>= #s without carry*/

  RXO_revw,	/* d = revw(s) */

  RXO_revl,	/* d = revl(s) */

  RXO_branch,	/* pc = d if cond(s) */

  RXO_branchrel,/* pc += d if cond(s) */

  RXO_jsr,	/* pc = d */

  RXO_jsrrel,	/* pc += d */

  RXO_rts,

  RXO_nop,

  RXO_nop2,

  RXO_nop3,

  RXO_scmpu,

  RXO_smovu,

  RXO_smovb,

  RXO_suntil,

  RXO_swhile,

  RXO_smovf,

  RXO_sstr,

  RXO_rmpa,

  RXO_mulhi,

  RXO_mullo,

  RXO_machi,

  RXO_maclo,

  RXO_mvtachi,

  RXO_mvtaclo,

  RXO_mvfachi,

  RXO_mvfacmi,

  RXO_mvfaclo,

  RXO_racw,

  RXO_sat,	/* sat(d) */

  RXO_satr,

  RXO_fadd,	/* d op= s */

  RXO_fcmp,

  RXO_fsub,

  RXO_ftoi,

  RXO_fmul,

  RXO_fdiv,

  RXO_round,

  RXO_itof,

  RXO_bset,	/* d |= (1<

  RXO_bclr,	/* d &= ~(1<

  RXO_btst,	/* s & (1<

  RXO_bnot,	/* d ^= (1<

  RXO_bmcc,	/* d = cond(s2) */

  RXO_clrpsw,	/* flag index in d */

  RXO_setpsw,	/* flag index in d */

  RXO_mvtipl,	/* new IPL in s */

  RXO_rtfi,

  RXO_rte,

  RXO_rtd,	/* undocumented */

  RXO_brk,

  RXO_dbt,	/* undocumented */

  RXO_int,	/* vector id in s */

  RXO_stop,

  RXO_wait,

  RXO_sccnd,	/* d = cond(s) ? 1 : 0 */

} RX_Opcode_ID;

/* Condition bitpatterns, as registers.  */

#define RXC_eq		0

#define RXC_z		0

#define RXC_ne		1

#define RXC_nz		1

#define RXC_c		2

#define RXC_nc		3

#define RXC_gtu		4

#define RXC_leu		5

#define RXC_pz		6

#define RXC_n		7

#define RXC_ge		8

#define RXC_lt		9

#define RXC_gt		10

#define RXC_le		11

#define RXC_o		12

#define RXC_no		13

#define RXC_always	14

#define RXC_never	15

typedef struct

{

  RX_Operand_Type  type;

  int              reg;

  int              addend;

  RX_Size          size;

} RX_Opcode_Operand;

typedef struct

{

  RX_Opcode_ID      id;

  int               n_bytes;

  int               prefix;

  char *            syntax;

  RX_Size           size;

  /* By convention, these are destination, source1, source2.  */

  RX_Opcode_Operand op[3];

  /* The logic here is:

     newflags = (oldflags & ~(int)flags_0) | flags_1 | (op_flags & flags_s)

     Only the O, S, Z, and C flags are affected.  */

  char flags_0; /* This also clears out flags-to-be-set.  */

  char flags_1;

  char flags_s;

} RX_Opcode_Decoded;

/* Within the syntax, %c-style format specifiers are as follows:

   %% = '%' character

   %0 = operand[0] (destination)

   %1 = operand[1] (source)

   %2 = operand[2] (2nd source)

   %s = operation size (b/w/l)

   %SN = operand size [N] (N=0,1,2)

   %aN = op[N] as an address (N=0,1,2)

   Register numbers 0..15 are general registers.  16..31 are control

   registers.  32..47 are condition codes.  */

int rx_decode_opcode (unsigned long, RX_Opcode_Decoded *, int (*)(void *), void *);