Copyright 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler, and 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 2 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. */
ix86 Unix assemblers, generate floating point instructions with
reversed source and destination registers in certain cases.
Unfortunately, gcc and possibly many other programs use this
reversed syntax, so we're stuck with it.
eg. `fsub %st(3),%st' results in st = st - st(3) as expected, but
`fsub %st,%st(3)' results in st(3) = st - st(3), rather than
the expected st(3) = st(3) - st
This happens with all the non-commutative arithmetic floating point
operations with two register operands, where the source register is
%st, and destination register is %st(i).
The affected opcode map is dceX, dcfX, deeX, defX. */
#ifndef SYSV386_COMPAT
non-broken opcodes at your peril. gcc generates SystemV/386
compatible instructions. */
#define SYSV386_COMPAT 1
#endif
#ifndef OLDGCC_COMPAT
generate nonsense fsubp, fsubrp, fdivp and fdivrp with operands
reversed. */
#define OLDGCC_COMPAT SYSV386_COMPAT
#endif
#define MOV_AX_DISP32 0xa0
#define POP_SEG_SHORT 0x07
#define JUMP_PC_RELATIVE 0xeb
#define INT_OPCODE 0xcd
#define INT3_OPCODE 0xcc
prefix when it can. */
#define FWAIT_OPCODE 0x9b
#define ADDR_PREFIX_OPCODE 0x67
#define DATA_PREFIX_OPCODE 0x66
#define LOCK_PREFIX_OPCODE 0xf0
#define CS_PREFIX_OPCODE 0x2e
#define DS_PREFIX_OPCODE 0x3e
#define ES_PREFIX_OPCODE 0x26
#define FS_PREFIX_OPCODE 0x64
#define GS_PREFIX_OPCODE 0x65
#define SS_PREFIX_OPCODE 0x36
#define REPNE_PREFIX_OPCODE 0xf2
#define REPE_PREFIX_OPCODE 0xf3
#define TWO_BYTE_OPCODE_ESCAPE 0x0f
#define NOP_OPCODE (char) 0x90
#define EBP_REG_NUM 5
#define ESP_REG_NUM 4
#define ESCAPE_TO_TWO_BYTE_ADDRESSING ESP_REG_NUM
#define NO_INDEX_REGISTER ESP_REG_NUM
#define NO_BASE_REGISTER EBP_REG_NUM
#define NO_BASE_REGISTER_16 6
#define REGMEM_FIELD_HAS_REG 0x3/* always = 0x3 */
#define REGMEM_FIELD_HAS_MEM (~REGMEM_FIELD_HAS_REG)
#define REX_OPCODE 0x40
#define REX_W 8
#define REX_R 4
#define REX_X 2
#define REX_B 1
#define MAX_OPERANDS 5
#define MAX_IMMEDIATE_OPERANDS 2
#define MAX_MEMORY_OPERANDS 2
#define MAX_MNEM_SIZE 20
#define MAX_REG_NAME_SIZE 8
