emit code coverage trace log for import into external tools

[williballenthin]

it would be useful to see what instructions speakeasy has emulated (via run_speakeasy), such as via the https://github.com/gaasedelen/lighthouse IDA Pro plugin. add an option to this script that emits a log file with the instructions emulated by speakeasy, in a format like:

boombox+3a06
boombox+3a09
boombox+3a0f
boombox+3a15
...

ref

[ambiso]

This can be achieved with a code-hook:

se = speakeasy.Speakeasy()

f = open("coverage.txt", "w")

def insn_trace(emu, addr, size, ctx):
    f.write(f"0x{addr:08x}\n")

se.add_code_hook(cb=insn_trace)
module = se.load_module("myfile.dll")
se.run_module(module, all_entrypoints=False)
report = se.get_report()

f.close()

This generates the "Address Trace" format for lighthouse. The size parameter is the size of the instruction in bytes, and can be used for e.g. EZCOV.