1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
#!/usr/bin/env python3
""" format.py
Bit-packs instructions and verifies value ranges according to instruction formats.
Every instruction-line in the code segment needs to start with the opcode,
which has to be tagged with the instruction-format name. Arguments have to be provided
in the correct order, and their first tag is verified also.
Some immediates can be given in different sizes and will be sliced to size automatically.
For example the "j" instruction-format can take an "imm20" pre-sliced immediate, or an
"imm21" immediate, truncating the lowest bit (and asserting that it is zero).
>>> from io import StringIO
>>> # doctest: +REPORT_NDIFF
... print(subv.join_all(format(StringIO('''
... == code 0x80000000
... # main:
... # load 0x10010000 (UART0) into t0
... 37/u 5/rd 10010/imm20
... # store 0x48 (H) in UART0+0
... 13/i 6/rd 0/funct3 0/rs 48/imm12
... 23/s 2/funct3 5/rs1 0/imm12 6/rs2
... # store 0x65 (e) in UART0+0
... 13/i 6/rd 0/funct3 0/rs 65/imm12
... 23/s 2/funct3 5/rs1 0/imm12 6/rs2
... # store 0x6c (l) in UART0+0
... 13/i 6/rd 0/funct3 0/rs 6c/imm12
... 23/s 2/funct3 5/rs1 0/imm12 6/rs2
... # store 0x6c (l) in UART0+0
... 13/i 6/rd 0/funct3 0/rs 6c/imm12
... 23/s 2/funct3 5/rs1 0/imm12 6/rs2
... # store 0x6f (o) in UART0+0
... 13/i 6/rd 0/funct3 0/rs 6f/imm12
... 23/s 2/funct3 5/rs1 0/imm12 6/rs2
... # store 0x0a (\\\\n) in UART0+0
... 13/i 6/rd 0/funct3 0/rs a/imm12
... 23/s 2/funct3 5/rs1 0/imm12 6/rs2
... # jump back up to the top
... 6f/j 0/rd -34/imm21
... '''[1:-1]))))
== code 0x80000000
# main:
# load 0x10010000 (UART0) into t0
37/7 05/5 10010/20
# store 0x48 (H) in UART0+0
13/7 06/5 0/3 00/5 048/12
23/7 00/5 2/3 05/5 06/5 00/7
# store 0x65 (e) in UART0+0
13/7 06/5 0/3 00/5 065/12
23/7 00/5 2/3 05/5 06/5 00/7
# store 0x6c (l) in UART0+0
13/7 06/5 0/3 00/5 06c/12
23/7 00/5 2/3 05/5 06/5 00/7
# store 0x6c (l) in UART0+0
13/7 06/5 0/3 00/5 06c/12
23/7 00/5 2/3 05/5 06/5 00/7
# store 0x6f (o) in UART0+0
13/7 06/5 0/3 00/5 06f/12
23/7 00/5 2/3 05/5 06/5 00/7
# store 0x0a (\\n) in UART0+0
13/7 06/5 0/3 00/5 00a/12
23/7 00/5 2/3 05/5 06/5 00/7
# jump back up to the top
6f/7 00/5 ff/8 1/1 3e6/10 1/1
"""
import subv
import bits
def _test_format(words):
return " ".join(map(str, words))
def pack_r(instr):
"""verify & pack R-type instructions.
>>> _test_format(pack_r([(0x33, 'r'), (5, 'rd'), (0, 'funct3'), (0xa, 'rs1'), (0xb, 'rs2'), (0, 'funct7')]))
'33/7 05/5 0/3 0a/5 0b/5 00/7'
"""
(op, rd, funct3, rs1, rs2, funct7) = instr
op = bits.u(subv.untag(op), 7)
rd = bits.u(subv.untag(rd, "rd"), 5)
funct3 = bits.u(subv.untag(funct3, "funct3"), 3)
rs1 = bits.u(subv.untag(rs1, "rs1"), 5)
rs2 = bits.u(subv.untag(rs2, "rs2"), 5)
funct7 = bits.u(subv.untag(funct7, "funct7"), 7)
return [op, rd, funct3, rs1, rs2, funct7]
def pack_i(instr):
"""verify & pack I-type instructions.
>>> _test_format(pack_i([(0x13, 'i'), (6, 'rd'), (0, 'funct3'), (0, 'rs'), (0x65, 'imm12')]))
'13/7 06/5 0/3 00/5 065/12'
"""
(op, rd, funct, rs, imm) = instr
op = bits.u(subv.untag(op), 7)
rd = bits.u(subv.untag(rd, "rd"), 5)
funct = bits.u(subv.untag(funct, "funct3"), 3)
rs = bits.u(subv.untag(rs, "rs"), 5)
imm = bits.i(subv.untag(imm, "imm12"), 12)
return [op, rd, funct, rs, imm]
def pack_s(instr):
"""verify & pack S-type instructions.
>>> _test_format(pack_s([(0x23, 's'), (2, 'funct3'), (5, 'rs1'), (0, 'imm12'), (6, 'rs2')]))
'23/7 00/5 2/3 05/5 06/5 00/7'
"""
(op, funct, rs1, imm, rs2) = instr
op = bits.u(subv.untag(op), 7)
funct = bits.u(subv.untag(funct, "funct3"), 3)
rs1 = bits.u(subv.untag(rs1, "rs1"), 5)
imm = bits.i(subv.untag(imm, "imm12"), 12)
rs2 = bits.u(subv.untag(rs2, "rs2"), 5)
imm_lo = imm[4:0]
imm_hi = imm[11:5]
return [op, imm_lo, funct, rs1, rs2, imm_hi]
def pack_b(instr):
"""verify & pack B-type instructions.
>>> _test_format(pack_b([(0x63, 'branch'), (0, 'funct3'), (6, 'rs1'), (0, 'rs2'), (0, 'imm12')]))
'63/7 0/1 0/4 0/3 06/5 00/5 00/6 0/1'
>>> _test_format(pack_b([(0x63, 'branch'), (0, 'funct3'), (6, 'rs1'), (0, 'rs2'), (-2, 'imm12')]))
'63/7 1/1 e/4 0/3 06/5 00/5 3f/6 1/1'
"""
(op, funct, rs1, rs2, imm) = instr
op = bits.u(subv.untag(op), 7)
funct = bits.u(subv.untag(funct, "funct3"), 3)
rs1 = bits.u(subv.untag(rs1, "rs1"), 5)
rs2 = bits.u(subv.untag(rs2, "rs2"), 5)
if imm[1] == "imm13":
imm = bits.i(subv.untag(imm, "imm13"), 13)
imm = imm[12:1]
else:
imm = bits.i(subv.untag(imm, "imm12"), 12)
imm_lo = imm[3:0]
imm_md = imm[9:4]
imm_11 = imm[10]
imm_12 = imm[11]
return [op, imm_11, imm_lo, funct, rs1, rs2, imm_md, imm_12]
def pack_u(instr):
"""verify & pack U-type instructions.
>>> _test_format(pack_u([(0x37, 'lui'), (5, 'rd', 't0'), (0x10010, 'imm20')]))
'37/7 05/5 10010/20'
>>> _test_format(pack_u([(0x37, 'lui'), (5, 'rd', 't0'), (-0x1234, 'imm20')]))
'37/7 05/5 fedcc/20'
"""
(op, rd, imm) = instr
op = bits.u(subv.untag(op), 7)
rd = bits.u(subv.untag(rd, "rd"), 5)
imm = bits.i(subv.untag(imm, "imm20"), 20)
return [op, rd, imm]
def pack_j(instr):
"""verify & pack J-type instructions.
>>> _test_format(pack_j([(0x6f, 'jal'), (0, 'rd', 'x0'), (0, 'imm20')]))
'6f/7 00/5 00/8 0/1 000/10 0/1'
>>> _test_format(pack_j([(0x6f, 'jal'), (0, 'rd', 'x0'), (-2, 'imm20')]))
'6f/7 00/5 ff/8 1/1 3fe/10 1/1'
"""
(op, rd, imm) = instr
op = bits.u(subv.untag(op), 7)
rd = bits.u(subv.untag(rd, "rd"), 5)
if imm[1] == "imm21":
imm = bits.i(subv.untag(imm, "imm21"), 21)
imm = imm[20:1]
else:
imm = bits.i(subv.untag(imm, "imm20"), 20)
imm_lo = imm[9:0]
imm_11 = imm[10]
imm_hi = imm[18:11]
imm_20 = imm[19]
return [op, rd, imm_hi, imm_11, imm_lo, imm_20]
format_map = {
"r": pack_r,
"i": pack_i,
"s": pack_s,
"b": pack_b,
"u": pack_u,
"j": pack_j,
}
@subv.with_parsed_lines
def format(iter):
for segment, line in iter:
if line["type"] == "instr" and segment == "code":
op = line["instr"][0]
assert len(op) == 2, "instruction without format label: {}".format(op)
(op, format) = op
if format not in format_map:
raise ValueError("unknown instruction format: {}".format(format))
formatter = format_map[format]
line["instr"] = formatter(line["instr"][:])
line = yield subv.format(line)
else:
line = yield line["raw"]
if __name__ == "__main__":
import sys
for line in format(sys.stdin):
print(line)
|
