2024-07-04 03:42:55 +00:00
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#!/usr/bin/env python3
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2023-11-23 06:17:01 +00:00
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#
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# disassembleBootTrace.py
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# David_Harris@hmc.edu 22 November 2023
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# SPDX-License-Identifier: Apache-2.0 WITH SHL-2.1
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#
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# Reads boottrace.log and disassembles the machine code
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#
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import csv
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import os
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import re
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# read a file from sim/logs/boottrace.log and extract the second comma-separated field containing the instruction
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print("Reading boottrace.log")
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trace = []
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count = 0
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with open('../../sim/logs/boottrace.log') as f:
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reader = csv.reader(f, delimiter=',')
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for row in reader:
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trace.append(row)
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count = count + 1
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if count > 50000000:
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break
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f.close()
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print("Disassembling boottrace.log instructions")
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# Write an assembly language file with the machine code
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with (open('boottrace.S', 'w')) as f:
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f.write('main:\n')
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for row in trace:
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instr = row[1]
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# scrape off leading white space from instr
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instr = instr.lstrip()
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# check if last character indicates an compressed or uncompressed instruction
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lastNibble = instr[-1]
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if (lastNibble == '3' or lastNibble == '7' or lastNibble == 'b' or lastNibble == 'f'):
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# uncompressed
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f.write('.word 0x' + instr + '\n')
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else:
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# compressed
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instr = instr[-4:]
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f.write('.hword 0x' + instr + '\n')
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f.close()
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# Then assemble and disassemble the file
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os.system('riscv64-unknown-elf-gcc -march=rv64gqc_zba_zbb_zbc_zbs_zfh_zicboz_zicbop_zicbom -mabi=lp64d -c boottrace.S')
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os.system('riscv64-unknown-elf-objdump -D boottrace.o > boottrace.objdump')
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# Patch disassembly back into boottrace
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print("Inserting disassembly into trace")
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dumpedLines = []
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with (open('boottrace.objdump', 'r')) as f:
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lines = f.readlines()
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f.close()
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lines = lines[7:] # skip header
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p = r'[^:]*:\s*(\S*)\s*(.*)'
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for line in lines:
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match = re.search(p, line)
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if (match):
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dump = [match.group(1), match.group(2)]
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dumpedLines.append(dump)
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linenum = 0
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for i in range(len(trace)):
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row = trace[i]
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row.insert(2, dumpedLines[i][1])
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# write trace back to csv file
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print("Writing trace back to boottrace_disasm.log")
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with (open('boottrace_disasm.log', 'w')) as f:
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writer = csv.writer(f)
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writer.writerows(trace)
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f.close()
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