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1 #
2 # AVR instruction decode definitions.
3 #
4 # Copyright (c) 2019-2020 Michael Rolnik <mrolnik@gmail.com>
5 #
6 # This library is free software; you can redistribute it and/or
7 # modify it under the terms of the GNU Lesser General Public
8 # License as published by the Free Software Foundation; either
9 # version 2.1 of the License, or (at your option) any later version.
10 #
11 # This library is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # Lesser General Public License for more details.
15 #
16 # You should have received a copy of the GNU Lesser General Public
17 # License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 #
20 #
21 # regs_16_31_by_one = [16 .. 31]
22 # regs_16_23_by_one = [16 .. 23]
23 # regs_24_30_by_two = [24, 26, 28, 30]
24 # regs_00_30_by_two = [0, 2, 4, 6, 8, .. 30]
26 %rd 4:5
27 %rr 9:1 0:4
29 %rd_a 4:4 !function=to_regs_16_31_by_one
30 %rd_b 4:3 !function=to_regs_16_23_by_one
31 %rd_c 4:2 !function=to_regs_24_30_by_two
32 %rr_a 0:4 !function=to_regs_16_31_by_one
33 %rr_b 0:3 !function=to_regs_16_23_by_one
35 %imm6 6:2 0:4
36 %imm8 8:4 0:4
38 %io_imm 9:2 0:4
39 %ldst_d_imm 13:1 10:2 0:3
42 &rd_rr rd rr
43 &rd_imm rd imm
45 @op_rd_rr .... .. . ..... .... &rd_rr rd=%rd rr=%rr
46 @op_rd_imm6 .... .... .. .. .... &rd_imm rd=%rd_c imm=%imm6
47 @op_rd_imm8 .... .... .... .... &rd_imm rd=%rd_a imm=%imm8
48 @fmul .... .... . ... . ... &rd_rr rd=%rd_b rr=%rr_b
50 #
51 # Arithmetic Instructions
52 #
53 ADD 0000 11 . ..... .... @op_rd_rr
54 ADC 0001 11 . ..... .... @op_rd_rr
55 ADIW 1001 0110 .. .. .... @op_rd_imm6
56 SUB 0001 10 . ..... .... @op_rd_rr
57 SUBI 0101 .... .... .... @op_rd_imm8
58 SBC 0000 10 . ..... .... @op_rd_rr
59 SBCI 0100 .... .... .... @op_rd_imm8
60 SBIW 1001 0111 .. .. .... @op_rd_imm6
61 AND 0010 00 . ..... .... @op_rd_rr
62 ANDI 0111 .... .... .... @op_rd_imm8
63 OR 0010 10 . ..... .... @op_rd_rr
64 ORI 0110 .... .... .... @op_rd_imm8
65 EOR 0010 01 . ..... .... @op_rd_rr
66 COM 1001 010 rd:5 0000
67 NEG 1001 010 rd:5 0001
68 INC 1001 010 rd:5 0011
69 DEC 1001 010 rd:5 1010
70 MUL 1001 11 . ..... .... @op_rd_rr
71 MULS 0000 0010 .... .... &rd_rr rd=%rd_a rr=%rr_a
72 MULSU 0000 0011 0 ... 0 ... @fmul
73 FMUL 0000 0011 0 ... 1 ... @fmul
74 FMULS 0000 0011 1 ... 0 ... @fmul
75 FMULSU 0000 0011 1 ... 1 ... @fmul
76 DES 1001 0100 imm:4 1011
78 #
79 # Branch Instructions
80 #
82 # The 22-bit immediate is partially in the opcode word,
83 # and partially in the next. Use append_16 to build the
84 # complete 22-bit value.
85 %imm_call 4:5 0:1 !function=append_16
87 @op_bit .... .... . bit:3 ....
88 @op_bit_imm .... .. imm:s7 bit:3
90 RJMP 1100 imm:s12
91 IJMP 1001 0100 0000 1001
92 EIJMP 1001 0100 0001 1001
93 JMP 1001 010 ..... 110 . imm=%imm_call
94 RCALL 1101 imm:s12
95 ICALL 1001 0101 0000 1001
96 EICALL 1001 0101 0001 1001
97 CALL 1001 010 ..... 111 . imm=%imm_call
98 RET 1001 0101 0000 1000
99 RETI 1001 0101 0001 1000
100 CPSE 0001 00 . ..... .... @op_rd_rr
101 CP 0001 01 . ..... .... @op_rd_rr
102 CPC 0000 01 . ..... .... @op_rd_rr
103 CPI 0011 .... .... .... @op_rd_imm8
104 SBRC 1111 110 rr:5 0 bit:3
105 SBRS 1111 111 rr:5 0 bit:3
106 SBIC 1001 1001 reg:5 bit:3
107 SBIS 1001 1011 reg:5 bit:3
108 BRBS 1111 00 ....... ... @op_bit_imm
109 BRBC 1111 01 ....... ... @op_bit_imm
111 #
112 # Data Transfer Instructions
113 #
115 %rd_d 4:4 !function=to_regs_00_30_by_two
116 %rr_d 0:4 !function=to_regs_00_30_by_two
118 @io_rd_imm .... . .. ..... .... &rd_imm rd=%rd imm=%io_imm
119 @ldst_d .. . . .. . rd:5 . ... &rd_imm imm=%ldst_d_imm
121 # The 16-bit immediate is completely in the next word.
122 # Fields cannot be defined with no bits, so we cannot play
123 # the same trick and append to a zero-bit value.
124 # Defer reading the immediate until trans_{LDS,STS}.
125 @ldst_s .... ... rd:5 .... imm=0
127 MOV 0010 11 . ..... .... @op_rd_rr
128 MOVW 0000 0001 .... .... &rd_rr rd=%rd_d rr=%rr_d
129 LDI 1110 .... .... .... @op_rd_imm8
130 LDS 1001 000 ..... 0000 @ldst_s
131 LDX1 1001 000 rd:5 1100
132 LDX2 1001 000 rd:5 1101
133 LDX3 1001 000 rd:5 1110
134 LDY2 1001 000 rd:5 1001
135 LDY3 1001 000 rd:5 1010
136 LDZ2 1001 000 rd:5 0001
137 LDZ3 1001 000 rd:5 0010
138 LDDY 10 . 0 .. 0 ..... 1 ... @ldst_d
139 LDDZ 10 . 0 .. 0 ..... 0 ... @ldst_d
140 STS 1001 001 ..... 0000 @ldst_s
141 STX1 1001 001 rr:5 1100
142 STX2 1001 001 rr:5 1101
143 STX3 1001 001 rr:5 1110
144 STY2 1001 001 rd:5 1001
145 STY3 1001 001 rd:5 1010
146 STZ2 1001 001 rd:5 0001
147 STZ3 1001 001 rd:5 0010
148 STDY 10 . 0 .. 1 ..... 1 ... @ldst_d
149 STDZ 10 . 0 .. 1 ..... 0 ... @ldst_d
150 LPM1 1001 0101 1100 1000
151 LPM2 1001 000 rd:5 0100
152 LPMX 1001 000 rd:5 0101
153 ELPM1 1001 0101 1101 1000
154 ELPM2 1001 000 rd:5 0110
155 ELPMX 1001 000 rd:5 0111
156 SPM 1001 0101 1110 1000
157 SPMX 1001 0101 1111 1000
158 IN 1011 0 .. ..... .... @io_rd_imm
159 OUT 1011 1 .. ..... .... @io_rd_imm
160 PUSH 1001 001 rd:5 1111
161 POP 1001 000 rd:5 1111
162 XCH 1001 001 rd:5 0100
163 LAC 1001 001 rd:5 0110
164 LAS 1001 001 rd:5 0101
165 LAT 1001 001 rd:5 0111
167 #
168 # Bit and Bit-test Instructions
169 #
170 LSR 1001 010 rd:5 0110
171 ROR 1001 010 rd:5 0111
172 ASR 1001 010 rd:5 0101
173 SWAP 1001 010 rd:5 0010
174 SBI 1001 1010 reg:5 bit:3
175 CBI 1001 1000 reg:5 bit:3
176 BST 1111 101 rd:5 0 bit:3
177 BLD 1111 100 rd:5 0 bit:3
178 BSET 1001 0100 0 bit:3 1000
179 BCLR 1001 0100 1 bit:3 1000
181 #
182 # MCU Control Instructions
183 #
184 BREAK 1001 0101 1001 1000
185 NOP 0000 0000 0000 0000
186 SLEEP 1001 0101 1000 1000
187 WDR 1001 0101 1010 1000