#
#   This file is part of the program psim.
#
#   Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au>
#
#   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
#
# Instruction unpacking:
#
#   Once the instruction has been decoded, the register (and other)
#   fields within the instruction need to be extracted.
#
#   The table that follows determines how each field should be treated.
#   Importantly it considers the case where the extracted field is to
#   be used immediatly or stored in an instruction cache.
#
#   <valid>
#
#   Zero marks the end of the table.  More importantly 1. indicates
#   that the entry is valid and can be cached. 2. indicates that that
#   the entry is valid but can not be cached.
#
#   <old_name>
#
#   The field name as given in the instruction spec.
#
#   <new_name>
#
#   A name for <old_name> once it has been extracted from the
#   instructioin (and possibly stored in the instruction cache).
#
#   <type>
#
#   String specifying the storage type for <new_name> (the extracted
#   field>.
#
#   <expression>
#
#   Specifies how to get <new_name> from <old_name>.  If null, old and
#   new name had better be the same. */
#
#
1:RA:RA::
1:RA:rA:signed_word *:(cpu_registers(processor)->gpr + RA)
1:RT:RT::
1:RT:rT:signed_word *:(cpu_registers(processor)->gpr + RT)
2:RS:RS::
1:RS:rS:signed_word *:(cpu_registers(processor)->gpr + RS)
2:RB:RB::
1:RB:rB:signed_word *:(cpu_registers(processor)->gpr + RB)
2:FRA:FRA::
1:FRA:frA:unsigned64 *:(cpu_registers(processor)->fpr + FRA)
2:FRB:FRB::
1:FRB:frB:unsigned64 *:(cpu_registers(processor)->fpr + FRB)
2:FRC:FRC::
1:FRC:frC:unsigned64 *:(cpu_registers(processor)->fpr + FRC)
2:FRS:FRS::
1:FRS:frS:unsigned64 *:(cpu_registers(processor)->fpr + FRS)
2:FRT:FRT::
1:FRT:frT:unsigned64 *:(cpu_registers(processor)->fpr + FRT)
1:SI:EXTS_SI:unsigned_word:((signed_word)(signed16)instruction)
2:BI:BI::
1:BI:BIT32_BI::BIT32(BI)
2:BA:BA::
1:BA:BIT32_BA::BIT32(BA)
2:BB:BB::
1:BB:BIT32_BB::BIT32(BB)
1:BD:EXTS_BD_0b00:unsigned_word:(((signed_word)(signed16)instruction) & ~3)
#1:BD:CIA_plus_EXTS_BD_0b00:unsigned_word:CIA + EXTS(BD_0b00)
1:LI:EXTS_LI_0b00:unsigned_word:((((signed_word)(signed32)(instruction << 6)) >> 6) & ~0x3)
1:D:EXTS_D:unsigned_word:((signed_word)(signed16)(instruction))
1:DS:EXTS_DS_0b00:unsigned_word:(((signed_word)(signed16)instruction) & ~0x3)