/* Opcode decoder for the Renesas RX
Copyright 2008, 2009, 2010
Free Software Foundation, Inc.
Written by DJ Delorie <dj@redhat.com>
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<<s) */
RXO_bclr, /* d &= ~(1<<s) */
RXO_btst, /* s & (1<<s2) */
RXO_bnot, /* d ^= (1<<s) */
RXO_bmcc, /* d<s> = 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 *);