#
# OpenRISC instruction decode definitions.
#
# Copyright (c) 2018 Richard Henderson <rth@twiddle.net>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, see <http://www.gnu.org/licenses/>.
#

&dab            d a b
&da             d a
&ab             a b
&dal            d a l
&ai             a i

####
# System Instructions
####

l_sys           001000 0000000000 k:16
l_trap          001000 0100000000 k:16
l_msync         001000 1000000000 00000000 00000000
l_psync         001000 1010000000 00000000 00000000
l_csync         001000 1100000000 00000000 00000000

l_rfe           001001 ----- ----- -------- --------

####
# Branch Instructions
####

l_j             000000 n:s26
l_jal           000001 n:s26
l_bnf           000011 n:s26
l_bf            000100 n:s26

l_jr            010001 ---------- b:5 -----------
l_jalr          010010 ---------- b:5 -----------

####
# Memory Instructions
####

&load           d a i
@load           ...... d:5 a:5 i:s16                    &load

%store_i        21:s5 0:11
&store          a b i
@store          ...... ..... a:5 b:5 ...........        &store i=%store_i

l_lwa           011011 ..... ..... ........ ........    @load
l_lwz           100001 ..... ..... ........ ........    @load
l_lws           100010 ..... ..... ........ ........    @load
l_lbz           100011 ..... ..... ........ ........    @load
l_lbs           100100 ..... ..... ........ ........    @load
l_lhz           100101 ..... ..... ........ ........    @load
l_lhs           100110 ..... ..... ........ ........    @load

l_swa           110011 ..... ..... ..... ...........    @store
l_sw            110101 ..... ..... ..... ...........    @store
l_sb            110110 ..... ..... ..... ...........    @store
l_sh            110111 ..... ..... ..... ...........    @store

####
# Immediate Operand Instructions
####

%mtspr_k        21:5 0:11

&rri            d a i
&rrk            d a k
@rri            ...... d:5 a:5 i:s16                    &rri
@rrk            ...... d:5 a:5 k:16                     &rrk

l_nop           000101 01--- ----- k:16

l_addi          100111 ..... ..... ........ ........    @rri
l_addic         101000 ..... ..... ........ ........    @rri
l_andi          101001 ..... ..... ........ ........    @rrk
l_ori           101010 ..... ..... ........ ........    @rrk
l_xori          101011 ..... ..... ........ ........    @rri
l_muli          101100 ..... ..... ........ ........    @rri

l_mfspr         101101 ..... ..... ........ ........    @rrk
l_mtspr         110000 ..... a:5 b:5 ...........        k=%mtspr_k

l_maci          010011 ----- a:5 i:s16

l_movhi         000110 d:5 ----0 k:16
l_macrc         000110 d:5 ----1 00000000 00000000

####
# Arithmetic Instructions
####

l_exths         111000 d:5 a:5 ----- - 0000 -- 1100
l_extbs         111000 d:5 a:5 ----- - 0001 -- 1100
l_exthz         111000 d:5 a:5 ----- - 0010 -- 1100
l_extbz         111000 d:5 a:5 ----- - 0011 -- 1100

l_add           111000 d:5 a:5 b:5   - 00 ---- 0000
l_addc          111000 d:5 a:5 b:5   - 00 ---- 0001
l_sub           111000 d:5 a:5 b:5   - 00 ---- 0010
l_and           111000 d:5 a:5 b:5   - 00 ---- 0011
l_or            111000 d:5 a:5 b:5   - 00 ---- 0100
l_xor           111000 d:5 a:5 b:5   - 00 ---- 0101
l_cmov          111000 d:5 a:5 b:5   - 00 ---- 1110
l_ff1           111000 d:5 a:5 ----- - 00 ---- 1111
l_fl1           111000 d:5 a:5 ----- - 01 ---- 1111

l_sll           111000 d:5 a:5 b:5   - 0000 -- 1000
l_srl           111000 d:5 a:5 b:5   - 0001 -- 1000
l_sra           111000 d:5 a:5 b:5   - 0010 -- 1000
l_ror           111000 d:5 a:5 b:5   - 0011 -- 1000

l_mul           111000 d:5 a:5 b:5   - 11 ---- 0110
l_mulu          111000 d:5 a:5 b:5   - 11 ---- 1011
l_div           111000 d:5 a:5 b:5   - 11 ---- 1001
l_divu          111000 d:5 a:5 b:5   - 11 ---- 1010

l_muld          111000 ----- a:5 b:5 - 11 ---- 0111
l_muldu         111000 ----- a:5 b:5 - 11 ---- 1100

l_mac           110001 ----- a:5 b:5 ------- 0001
l_macu          110001 ----- a:5 b:5 ------- 0011
l_msb           110001 ----- a:5 b:5 ------- 0010
l_msbu          110001 ----- a:5 b:5 ------- 0100

l_slli          101110 d:5 a:5 -------- 00 l:6
l_srli          101110 d:5 a:5 -------- 01 l:6
l_srai          101110 d:5 a:5 -------- 10 l:6
l_rori          101110 d:5 a:5 -------- 11 l:6

####
# Compare Instructions
####

l_sfeq          111001 00000 a:5 b:5 -----------
l_sfne          111001 00001 a:5 b:5 -----------
l_sfgtu         111001 00010 a:5 b:5 -----------
l_sfgeu         111001 00011 a:5 b:5 -----------
l_sfltu         111001 00100 a:5 b:5 -----------
l_sfleu         111001 00101 a:5 b:5 -----------
l_sfgts         111001 01010 a:5 b:5 -----------
l_sfges         111001 01011 a:5 b:5 -----------
l_sflts         111001 01100 a:5 b:5 -----------
l_sfles         111001 01101 a:5 b:5 -----------

l_sfeqi         101111 00000 a:5 i:s16
l_sfnei         101111 00001 a:5 i:s16
l_sfgtui        101111 00010 a:5 i:s16
l_sfgeui        101111 00011 a:5 i:s16
l_sfltui        101111 00100 a:5 i:s16
l_sfleui        101111 00101 a:5 i:s16
l_sfgtsi        101111 01010 a:5 i:s16
l_sfgesi        101111 01011 a:5 i:s16
l_sfltsi        101111 01100 a:5 i:s16
l_sflesi        101111 01101 a:5 i:s16

####
# FP Instructions
####

lf_add_s        110010 d:5 a:5 b:5   --- 00000000
lf_sub_s        110010 d:5 a:5 b:5   --- 00000001
lf_mul_s        110010 d:5 a:5 b:5   --- 00000010
lf_div_s        110010 d:5 a:5 b:5   --- 00000011
lf_rem_s        110010 d:5 a:5 b:5   --- 00000110
lf_madd_s       110010 d:5 a:5 b:5   --- 00000111

lf_itof_s       110010 d:5 a:5 00000 --- 00000100
lf_ftoi_s       110010 d:5 a:5 00000 --- 00000101

lf_sfeq_s       110010 ----- a:5 b:5 --- 00001000
lf_sfne_s       110010 ----- a:5 b:5 --- 00001001
lf_sfgt_s       110010 ----- a:5 b:5 --- 00001010
lf_sfge_s       110010 ----- a:5 b:5 --- 00001011
lf_sflt_s       110010 ----- a:5 b:5 --- 00001100
lf_sfle_s       110010 ----- a:5 b:5 --- 00001101