mirror of
https://github.com/openhwgroup/cvw
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228 lines
7.8 KiB
Python
Executable File
228 lines
7.8 KiB
Python
Executable File
#!/usr/bin/python3
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##################################
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# testgen-LOAD.py
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#
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# Jarred Allen <jaallen@g.hmc.edu> 02 February 2021
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#
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# Generate directed and random test vectors for RISC-V Design Validation.
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##################################
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##################################
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# libraries
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##################################
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from datetime import datetime
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from random import randint, seed, getrandbits
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##################################
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# functions
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##################################
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def rand_reg():
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"""Produce a random register (skipping 6 and 31, since they're used for other things)"""
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r = randint(1,29)
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if r >= 6:
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r += 1
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return r
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def rand_value(width):
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"""Generate a random value which fits in the given width"""
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return randint(0, (1 << width) - 1)
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def rand_offset():
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"""Generate a random offset"""
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ret = rand_value(12)
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# print("Random offset: %d" % ret)
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return ret
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def rand_source():
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"""Generate a random value for the source register, such that the load address is in the test data"""
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ret = randint(1 << 12, (1 << 12) + (1 << 10))
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# print("Random source: %d" % ret)
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return ret
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def add_offset_to_source(source, offset):
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"""Find the address from the given source value and offset"""
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if offset & 0x800:
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offset -= 0x1000
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return source + offset
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def insert_into_data(test_data, source, offset, value, width, xlen):
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"""Insert the given value into the given location of the test data"""
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address = add_offset_to_source(source, offset)
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# print("Test #%d" % testcase_num)
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# print(f"Source: {source}, Offset: {offset}, Value: {value}, Width: {width}, xlen: {xlen}, Addr: {address}")
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if address < 0:
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return False
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word_offset = address % (xlen // 8)
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word_address = address - word_offset
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if word_address in test_data:
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return False
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test_data[word_address] = value * (1 << (word_offset*8)) + ((~(((1 << width)-1) << (word_offset*8))) & rand_value(xlen))
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# print(f"Word: {hex(test_data[word_address])}")
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return True
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def align(address, width):
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"""Align the address to the given width, in bits"""
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return address - (address % (width // 8))
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testcase_num = 0
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def generate_case(xlen, instruction, load_register, source_register, source_register_value, offset, expected):
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"""Produce the specified test case and return it as a pair of strings, where the first is the test case and the second is the output"""
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global testcase_num
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if xlen == 64:
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store = "sd"
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elif xlen == 32:
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if instruction in ["lwu", "ld"]:
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raise Exception("Instruction %s not supported in RV32I" % instruction)
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store = "sw"
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else:
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raise Exception("Unknown xlen value: %s" % xlen)
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if offset >= 0x800:
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offset -= 0x1000
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if widths[instruction] != xlen:
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expected = expected % (1 << widths[instruction])
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if 'u' not in instruction:
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if expected & (1 << (widths[instruction] - 1)):
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expected = (expected + ~((1 << widths[instruction]) - 1)) & ((1 << xlen) - 1)
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data = f"""# Testcase {testcase_num}: source {offset}(x{source_register} == {source_register_value}), result: x{load_register} == {expected}
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la x31, test_data
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lui x{source_register}, {source_register_value // (1 << 12)}
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addi x{source_register}, x{source_register}, {source_register_value % (1 << 12)}
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add x{source_register}, x{source_register}, x31
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{instruction} x{load_register}, {offset}(x{source_register})
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{store} x{load_register}, {(testcase_num*xlen//8) % 0x800}(x6)
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RVTEST_IO_ASSERT_GPR_EQ(x8, x{load_register}, {expected})
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"""
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testcase_num += 1
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if testcase_num*xlen//8 % 0x800 == 0:
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data += "# Adjust x6 because we're storing too many things\naddi x6, x6, 1024\naddi x6, x6, 1024\n\n"
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if xlen == 32:
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reference_output = "{:08x}\n".format(expected)
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elif xlen == 64:
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reference_output = "{:08x}\n{:08x}\n".format(expected % (1 << 32), expected >> 32)
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return (data, reference_output)
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def write_header(outfile):
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outfile.write(f"""///////////////////////////////////////////
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//
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// WALLY-LOAD
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//
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// Author: {author}
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//
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// Created {str(datetime.now())}
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//
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""")
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outfile.write(open("testgen_header.S", "r").read())
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def write_test_data(outfile, test_data, xlen):
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# print("Begin writing test data:")
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# print("{} entries, from address {} to {}".format(len(test_data), min(test_data.keys()), max(test_data.keys())))
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# print(test_data)
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outfile.write("""
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.align 16
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test_data:
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""")
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if xlen == 32:
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data_word = ".word"
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elif xlen == 64:
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data_word = ".dword"
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else:
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raise Exception("Unknown xlen: %d" % xlen)
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byte_width = xlen // 8
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for addr in [0] + sorted(test_data.keys()):
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if addr in test_data:
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word = f" {data_word} {hex(test_data[addr] % (1 << xlen))} # test_data+{hex(addr)}\n"
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else:
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word = ""
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try:
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fill_len = (min(k for k in test_data.keys() if k > addr) - addr) // byte_width - 1
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if word == "":
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fill_len += 1
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fill = f" .fill {fill_len}, {byte_width}, 0x0\n"
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except:
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fill = ""
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case = word+fill
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outfile.write(case)
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##################################
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# main body
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##################################
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widths = {
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"lb": 8,
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"lbu": 8,
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"lh": 16,
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"lhu": 16,
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"lw": 32,
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"lwu": 32,
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"ld": 64,
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}
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instructions = [i for i in widths]
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author = "Jarred Allen"
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xlens = [32, 64]
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numrand = 100;
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# setup
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seed(0) # make tests reproducible
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for xlen in xlens:
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testcase_num = 0
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fname = "../../imperas-riscv-tests/riscv-test-suite/rv{}i/src/WALLY-LOAD.S".format(xlen)
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refname = "../../imperas-riscv-tests/riscv-test-suite/rv{}i/references/WALLY-LOAD.reference_output".format(xlen)
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f = open(fname, "w")
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r = open(refname, "w")
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write_header(f)
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test_data = dict()
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corner_values = [0x00, 0xFFFFFFFF, 0x7F, 0x7FFF, 0x7FFFFFFF]
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if xlen == 64:
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corner_values += [0xFFFFFFFFFFFFFFFF, 0x7FFFFFFFFFFFFFF]
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corner_offsets = [0x800, 0x000, 0x7FF]
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for instruction in instructions:
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print("Running xlen: %d, instruction: %s" % (xlen, instruction))
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if xlen == 32:
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if instruction in ["lwu", "ld"]:
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continue
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for value in corner_values + [rand_value(widths[instruction]) for _ in range(3)]:
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value = value % (1 << widths[instruction])
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source_reg = rand_source()
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for offset in corner_offsets + [rand_offset() for _ in range(3)]:
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offset = align(offset, widths[instruction])
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source_reg = align(source_reg, widths[instruction])
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if insert_into_data(test_data, source_reg, offset, value, widths[instruction], xlen):
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data, output = generate_case(xlen, instruction, rand_reg(), rand_reg(), source_reg, offset, value)
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f.write(data)
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r.write(output)
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while testcase_num % 4:
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source = rand_source()
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offset = rand_offset()
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value = rand_value(widths[instruction])
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if insert_into_data(test_data, source, offset, value, widths['lb'], xlen):
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data, output = generate_case(xlen, 'lb', rand_reg(), rand_reg(), source, offset, value)
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f.write(data)
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r.write(output)
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f.write("""# ---------------------------------------------------------------------------------------------
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RVTEST_IO_WRITE_STR(x31, "Test End\\n")
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# ---------------------------------------------------------------------------------------------
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RV_COMPLIANCE_HALT
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RV_COMPLIANCE_CODE_END
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.data
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# Input data section
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""")
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write_test_data(f, test_data, xlen)
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f.write("""# Output data section.
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RV_COMPLIANCE_DATA_BEGIN
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test_1_res:
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""")
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f.write(f".fill {testcase_num}, {xlen//8}, -1\n")
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f.write("\nRV_COMPLIANCE_DATA_END\n")
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f.close()
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r.close()
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