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/* mmix.h -- Header file for MMIX opcode table
Copyright (C) 2001-2020 Free Software Foundation, Inc.
Written by Hans-Peter Nilsson (hp@bitrange.com)
This file is part of GDB, GAS, and the GNU binutils.
GDB, GAS, and the GNU binutils are free software; you can redistribute
them and/or modify them under the terms of the GNU General Public
License as published by the Free Software Foundation; either version 3,
or (at your option) any later version.
GDB, GAS, and the GNU binutils are distributed in the hope that they
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 file; see the file COPYING3. If not, write to the Free
Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
/* We could have just a char*[] table indexed by the register number, but
that would not allow for synonyms. The table is terminated with an
entry with a NULL name. */
struct mmix_spec_reg
{
const char *name;
unsigned int number;
};
/* General indication of the type of instruction. */
enum mmix_insn_type
{
mmix_type_pseudo,
mmix_type_normal,
mmix_type_branch,
mmix_type_condbranch,
mmix_type_memaccess_octa,
mmix_type_memaccess_tetra,
mmix_type_memaccess_wyde,
mmix_type_memaccess_byte,
mmix_type_memaccess_block,
mmix_type_jsr
};
/* Type of operands an instruction takes. Use when parsing assembly code
and disassembling. */
enum mmix_operands_type
{
mmix_operands_none = 0,
/* All operands are registers: "$X,$Y,$Z". */
mmix_operands_regs,
/* "$X,YZ", like SETH. */
mmix_operands_reg_yz,
/* The regular "$X,$Y,$Z|Z".
The Z is optional; if only "$X,$Y" is given, then "$X,$Y,0" is
assumed. */
mmix_operands_regs_z_opt,
/* The regular "$X,$Y,$Z|Z". */
mmix_operands_regs_z,
/* "Address"; only JMP. Zero operands allowed unless GNU syntax. */
mmix_operands_jmp,
/* "$X|X,$Y,$Z|Z": PUSHGO; like "3", but X can be expressed as an
integer. */
mmix_operands_pushgo,
/* Two registers or a register and a byte, like FLOT, possibly with
rounding: "$X,$Z|Z" or "$X,ROUND_MODE,$Z|Z". */
mmix_operands_roundregs_z,
/* "X,YZ", POP. Unless GNU syntax, zero or one operand is allowed. */
mmix_operands_pop,
/* Two registers, possibly with rounding: "$X,$Z" or
"$X,ROUND_MODE,$Z". */
mmix_operands_roundregs,
/* "XYZ", like SYNC. */
mmix_operands_sync,
/* "X,$Y,$Z|Z", like SYNCD. */
mmix_operands_x_regs_z,
/* "$X,Y,$Z|Z", like NEG and NEGU. The Y field is optional, default 0. */
mmix_operands_neg,
/* "$X,Address, like GETA or branches. */
mmix_operands_regaddr,
/* "$X|X,Address, like PUSHJ. */
mmix_operands_pushj,
/* "$X,spec_reg"; GET. */
mmix_operands_get,
/* "spec_reg,$Z|Z"; PUT. */
mmix_operands_put,
/* Two registers, "$X,$Y". */
mmix_operands_set,
/* "$X,0"; SAVE. */
mmix_operands_save,
/* "0,$Z"; UNSAVE. */
mmix_operands_unsave,
/* "X,Y,Z"; like SWYM or TRAP. Zero (or 1 if GNU syntax) to three
operands, interpreted as 0; XYZ; X, YZ and X, Y, Z. */
mmix_operands_xyz_opt,
/* Just "Z", like RESUME. Unless GNU syntax, the operand can be omitted
and will then be assumed zero. */
mmix_operands_resume,
/* These are specials to handle that pseudo-directives are specified
like ordinary insns when being mmixal-compatible. They signify the
specific pseudo-directive rather than the operands type. */
/* LOC. */
mmix_operands_loc,
/* PREFIX. */
mmix_operands_prefix,
/* BYTE. */
mmix_operands_byte,
/* WYDE. */
mmix_operands_wyde,
/* TETRA. */
mmix_operands_tetra,
/* OCTA. */
mmix_operands_octa,
/* LOCAL. */
mmix_operands_local,
/* BSPEC. */
mmix_operands_bspec,
/* ESPEC. */
mmix_operands_espec,
};
struct mmix_opcode
{
const char *name;
unsigned long match;
unsigned long lose;
enum mmix_operands_type operands;
/* This is used by the disassembly function. */
enum mmix_insn_type type;
};
/* Declare the actual tables. */
extern const struct mmix_opcode mmix_opcodes[];
/* This one is terminated with an entry with a NULL name. */
extern const struct mmix_spec_reg mmix_spec_regs[];
/* Some insn values we use when padding and synthesizing address loads. */
#define IMM_OFFSET_BIT 1
#define COND_INV_BIT 0x8
#define PRED_INV_BIT 0x10
#define PUSHGO_INSN_BYTE 0xbeu
#define GO_INSN_BYTE 0x9eu
#define SETL_INSN_BYTE 0xe3u
#define INCML_INSN_BYTE 0xe6u
#define INCMH_INSN_BYTE 0xe5u
#define INCH_INSN_BYTE 0xe4u
#define SWYM_INSN_BYTE 0xfdu
#define JMP_INSN_BYTE 0xf0u
/* We can have 256 - 32 (local registers) - 1 ($255 is not allocatable)
global registers. */
#define MAX_GREGS 223
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