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#!/usr/bin/env python3
""" validate.py
Validates mnemonic labels match the numeric values given for opcodes,
register codes, etc; normalizes argument order and verifies that there are
no missing arguments.
>>> from io import StringIO
>>> # doctest: +REPORT_NDIFF
... print(subv.join_all(validate(StringIO('''
... == code 0x80000000
... main:
... # load 0x10010000 (UART0) into t0
... 37/lui 5/rd/t0 0x10010/imm20
... # store 0x48 (H) in UART0+0
... 13/opi 0/subop/add 6/rd/t1 0/rs/x0 48/imm12
... 23/store 2/width/word 5/rs/t0 6/rs/t1 0/off12
... # store 0x65 (e) in UART0+0
... 13/opi 0/subop/add 6/rd/t1 0/rs/x0 65/imm12
... 23/store 2/width/word 5/rs/t0 6/rs/t1 0/off12
... # store 0x6c (l) in UART0+0
... 13/opi 0/subop/add 6/rd/t1 0/rs/x0 6c/imm12
... 23/store 2/width/word 5/rs/t0 6/rs/t1 0/off12
... # store 0x6c (l) in UART0+0
... 13/opi 0/subop/add 6/rd/t1 0/rs/x0 6c/imm12
... 23/store 2/width/word 5/rs/t0 6/rs/t1 0/off12
... # store 0x6f (o) in UART0+0
... 13/opi 0/subop/add 6/rd/t1 0/rs/x0 6f/imm12
... 23/store 2/width/word 5/rs/t0 6/rs/t1 0/off12
... # store 0x0a (\\\\n) in UART0+0
... 13/opi 0/subop/add 6/rd/t1 0/rs/x0 0a/imm12
... 23/store 2/width/word 5/rs/t0 6/rs/t1 0/off12
... # jump back up to the top
... 6f/jal 0/rd/x0 main/off21
... '''[1:-1]))))
== 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 5/rs1 0/imm12 2/funct3 6/rs2
# store 0x65 (e) in UART0+0
13/i 6/rd 0/funct3 0/rs 65/imm12
23/s 5/rs1 0/imm12 2/funct3 6/rs2
# store 0x6c (l) in UART0+0
13/i 6/rd 0/funct3 0/rs 6c/imm12
23/s 5/rs1 0/imm12 2/funct3 6/rs2
# store 0x6c (l) in UART0+0
13/i 6/rd 0/funct3 0/rs 6c/imm12
23/s 5/rs1 0/imm12 2/funct3 6/rs2
# store 0x6f (o) in UART0+0
13/i 6/rd 0/funct3 0/rs 6f/imm12
23/s 5/rs1 0/imm12 2/funct3 6/rs2
# store 0x0a (\\n) in UART0+0
13/i 6/rd 0/funct3 0/rs a/imm12
23/s 5/rs1 0/imm12 2/funct3 6/rs2
# jump back up to the top
6f/j 0/rd main/off21
"""
import subv
def pop_piece(line, labels):
for part in line:
if part[1] in labels:
line.remove(part)
return (part[0], labels[0])
raise ValueError("Expected a part with labels {}".format(labels))
def pop_immediate(line, sizes, allow_offset=False):
if isinstance(sizes, int):
sizes = [sizes]
for part in line:
imm = subv.parse_immediate(part[1])
if imm and imm["size"] in sizes:
line.remove(part)
if not isinstance(part[0], str):
imm["mode"] = "imm"
return (part[0], subv.format_immediate(imm))
raise ValueError(
"Expected an immediate with size {}".format("/".join(str(s) for s in sizes))
)
REG_NAMES = "zero,ra,sp,gp,tp,t0,t1,t2,s0,s1,a0,a1,a2,a3,a4,a5,a6,a7,s2,s3,s4,s5,s6,s7,s8,s9,s10,s11,t3,t4,t5,t6"
REG_NAMES = {name: i for i, name in enumerate(REG_NAMES.split(","))}
REG_NAMES.update({"x{}".format(i): i for i in range(32)})
def pop_register(line, labels):
for part in line:
if part[1] in labels:
line.remove(part)
value = part[0]
if value < 0 or value > 31:
raise ValueError(
"Invalid register value {} (expected 0...31)".format(value)
)
if len(part) > 2:
name = part[2]
try:
assert value == REG_NAMES[name], ValueError(
"Invalid register value {} for '{}', expected {}".format(
value, name, REG_NAMES[name]
)
)
except KeyError:
raise ValueError("Unknown register name '{}'".format(name))
return (part[0], labels[0])
raise ValueError("Expected a register with labels {}".format(labels))
def validate_r(inputs):
op = inputs.pop(0)
dest = pop_register(inputs, ["rd", "dest"])
funct = pop_piece(inputs, ["funct7", "funct", "subop"])
rs1 = pop_register(inputs, ["rs1", "rs", "src1", "src"])
rs2 = pop_register(inputs, ["rs2", "rs", "src2", "src"])
assert len(inputs) == 0, ValueError("Extra arguments: {}".format(inputs))
return [
(op[0], "r"),
dest,
funct,
rs1,
rs2,
]
def validate_i(inputs):
op = inputs.pop(0)
rs_name = "src"
if op[1] in ["load", "jalr"]:
rs_name = "base"
dest = pop_register(inputs, ["rd", "dest"])
funct = pop_piece(inputs, ["funct3", "funct", "subop"])
rs = pop_register(inputs, ["rs", rs_name])
imm = pop_immediate(inputs, 12)
assert len(inputs) == 0, ValueError("Extra arguments: {}".format(inputs))
return [
(op[0], "i"),
dest,
funct,
rs,
imm,
]
def validate_s(inputs):
op = inputs.pop(0)
base = pop_register(inputs, ["rs1", "rs", "base"])
offset = pop_immediate(inputs, 12, allow_offset=True)
width = pop_piece(inputs, ["funct3", "funct", "width"])
src = pop_register(inputs, ["rs2", "rs", "src"])
assert len(inputs) == 0, ValueError("Extra arguments: {}".format(inputs))
return [
(op[0], "s"),
base,
offset,
width,
src,
]
def validate_b(inputs):
op = inputs.pop(0)
funct = pop_piece(inputs, ["funct3", "funct", "subop"])
rs1 = pop_register(inputs, ["rs1", "rs", "src1", "src"])
rs2 = pop_register(inputs, ["rs2", "rs", "src2", "src"])
offset = pop_immediate(inputs, [12, 13], allow_offset=True)
assert len(inputs) == 0, ValueError("Extra arguments: {}".format(inputs))
return [
(op[0], "b"),
funct,
rs1,
rs2,
offset,
]
def validate_u(inputs):
op = inputs.pop(0)
rd = pop_register(inputs, ["rd", "dest"])
imm = pop_immediate(inputs, 20, allow_offset=True)
assert len(inputs) == 0, ValueError("Extra arguments: {}".format(inputs))
return [
(op[0], "u"),
rd,
imm,
]
def validate_j(inputs):
op = inputs.pop(0)
dest = pop_register(inputs, ["rd", "dest"])
offset = pop_immediate(inputs, [21, 20], allow_offset=True)
assert len(inputs) == 0, ValueError("Extra arguments: {}".format(inputs))
return [
(op[0], "j"),
dest,
offset,
]
instr_map = {
"opr": (validate_r, 0x33),
"opi": (validate_i, 0x13),
"load": (validate_i, 0x03),
"jalr": (validate_i, 0x67),
"system": (validate_i, 0x73),
"store": (validate_s, 0x23),
"branch": (validate_b, 0x63),
"lui": (validate_u, 0x37),
"auipc": (validate_u, 0x17),
"jal": (validate_j, 0x6F),
}
@subv.with_parsed_lines
def validate(iter):
for segment, line in iter:
if line["type"] == "instr" and segment == "code":
op = line["instr"][0]
assert len(op) == 2, "instruction without op label: {}".format(op)
(op, label) = op
if label not in instr_map:
raise ValueError("unknown op label: {}".format(label))
(validator, expected) = instr_map[label]
if op != expected:
raise ValueError(
"opcode {} doesn't match label {} (expected {})".format(
op, label, expected
)
)
line["instr"] = validator(line["instr"][:])
line = yield subv.format(line)
else:
line = yield line["raw"]
if __name__ == "__main__":
import sys
for line in validate(sys.stdin):
print(line)
|
