/* insns.h   header file for insns.c
 *
 * The Netwide Assembler is copyright (C) 1996 Simon Tatham and
 * Julian Hall. All rights reserved. The software is
 * redistributable under the licence given in the file "Licence"
 * distributed in the NASM archive.
 */

#ifndef NASM_INSNS_H
#define NASM_INSNS_H

struct itemplate {
    int opcode;                        /* the token, passed from "parser.c" */
    int operands;                      /* number of operands */
    long opd[3];                       /* bit flags for operand types */
    char *code;                        /* the code it assembles to */
    int flags;                         /* some flags */
};

/*
 * Instruction template flags. These specify which processor
 * targets the instruction is eligible for, whether it is
 * privileged or undocumented, and also specify extra error
 * checking on the matching of the instruction.
 *
 * IF_SM stands for Size Match: any operand whose size is not
 * explicitly specified by the template is `really' intended to be
 * the same size as the first size-specified operand.
 * Non-specification is tolerated in the input instruction, but
 * _wrong_ specification is not.
 *
 * IF_SM2 invokes Size Match on only the first _two_ operands, for
 * three-operand instructions such as SHLD: it implies that the
 * first two operands must match in size, but that the third is
 * required to be _unspecified_.
 *
 * IF_SB invokes Size Byte: operands with unspecified size in the
 * template are really bytes, and so no non-byte specification in
 * the input instruction will be tolerated. IF_SW similarly invokes
 * Size Word, and IF_SD invokes Size Doubleword.
 *
 * (The default state if neither IF_SM nor IF_SM2 is specified is
 * that any operand with unspecified size in the template is
 * required to have unspecified size in the instruction too...)
 */

#define IF_SM     0x0001               /* size match */
#define IF_SM2    0x0002               /* size match first two operands */
#define IF_SB     0x0004               /* unsized operands can't be non-byte */
#define IF_SW     0x0008               /* unsized operands can't be non-word */
#define IF_SD     0x0010               /* unsized operands can't be nondword */
#define IF_8086   0x0000               /* 8086 instruction */
#define IF_186    0x0100               /* 186+ instruction */
#define IF_286    0x0200               /* 286+ instruction */
#define IF_386    0x0300               /* 386+ instruction */
#define IF_486    0x0400               /* 486+ instruction */
#define IF_PENT   0x0500               /* Pentium instruction */
#define IF_P6     0x0600               /* P6 instruction */
#define IF_CYRIX  0x0800               /* Cyrix-specific instruction */
#define IF_PMASK  0x0F00               /* the mask for processor types */
#define IF_PRIV   0x1000               /* it's a privileged instruction */
#define IF_UNDOC  0x2000               /* it's an undocumented instruction */
#define IF_FPU    0x4000               /* it's an FPU instruction */
#define IF_MMX    0x8000               /* it's an MMX instruction */

#endif
