23b: mask->FIR chain decoded — DESIGN body is vectorized LOG2 of band curve (poly fingerprinted), WIN_freq identified as periodic Hann(4096) falling half applied to FIR[n/2..n), full ILT stub->impl table resolved offline (ilt_resolve.py), live buffer catalog extended (SIMD lane masks at 0x540598, complex identity reset between callbacks, overlap buffer at 0x5406f8 non-zero), plugin output proven nondeterministic across renders (LCG dither) — spectral metrics only; ptrace lab scripts + lessons (TRACECLONE before CONT, sub-second host lifecycle under -renderproject)
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#!/usr/bin/env python3
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"""fntrace.py — ptrace INT3 tracer for FUN_180529fe0 (mask chain vtbl slot 6)
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in the live yabridge host. The wine module is mapped at its preferred base,
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so dump VAs == runtime addresses (verified: exec map 0x180001000-0x181baa000).
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On each hit logs: RIP, RCX (ctx), RDX, R8D (count), R9D, [RSP] (return addr),
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plus xmm0/xmm1 low scalars if available via GETFPREGS (skipped: not portable).
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Usage: python3 scripts/fntrace.py [rpp] [nhits]
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"""
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import ctypes
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import glob
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import os
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import signal
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import struct
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import subprocess
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import sys
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import time
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FN = int(os.environ.get('FN_ADDR', '0x180529FE0'), 16)
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SNAPDIR = '/tmp/opencode/fntrace'
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PTRACE_TRACEME = 0
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PTRACE_PEEKTEXT = 1
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PTRACE_PEEKDATA = 2
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PTRACE_POKETEXT = 4
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PTRACE_CONT = 7
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PTRACE_SINGLESTEP = 9
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PTRACE_GETREGS = 12
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PTRACE_SETREGS = 13
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PTRACE_ATTACH = 16
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PTRACE_DETACH = 17
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PTRACE_SEIZE = 0x4206
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PTRACE_INTERRUPT = 0x4207
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PTRACE_O_TRACECLONE = 0x00000002
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PTRACE_EVENT_CLONE = 3 # status >> 16 == 4 (event+1)? actually event = status>>16, CLONE==3 -> 4? use raw compare below
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PTRACE_EVENT_FORK = 1
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class UserRegs(ctypes.Structure):
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_fields_ = [(n, ctypes.c_ulonglong) for n in (
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'r15', 'r14', 'r13', 'r12', 'rbp', 'rbx', 'r11', 'r10',
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'r9', 'r8', 'rax', 'rcx', 'rdx', 'rsi', 'rdi', 'orig_rax',
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'rip', 'cs', 'eflags', 'rsp', 'ss', 'fs_base', 'gs_base',
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'ds', 'es', 'fs', 'gs')]
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libc = ctypes.CDLL('libc.so.6', use_errno=True)
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def ptrace(req, pid, addr=0, data=0):
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libc.ptrace.restype = ctypes.c_long
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r = libc.ptrace(req, pid, ctypes.c_void_p(addr), ctypes.c_void_p(data))
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if r == -1:
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e = ctypes.get_errno()
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if req not in (PTRACE_PEEKTEXT, PTRACE_PEEKDATA):
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raise OSError(e, f'ptrace({req:#x},{pid}) failed')
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return None
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return r
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def find_host():
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for p in glob.glob('/proc/[0-9]*'):
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pid = int(os.path.basename(p))
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try:
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cmd = open(f'/proc/{pid}/cmdline', 'rb').read().replace(b'\0', b' ').decode('utf8', 'replace')
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maps = open(f'/proc/{pid}/maps').read()
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except Exception:
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continue
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if 'soothe2' in maps and 'reaper' not in cmd:
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return pid
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return None
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def main():
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rpp = sys.argv[1] if len(sys.argv) > 1 else '/home/m/soothe-bt/dual_b1q_0.5.rpp'
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nhits = int(sys.argv[2]) if len(sys.argv) > 2 else 24
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render = '--render' in sys.argv
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os.makedirs(SNAPDIR, exist_ok=True)
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subprocess.run('pkill -9 -x reaser 2>/dev/null; pkill -9 -x reaper 2>/dev/null; '
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"pkill -9 -f '[y]abridge' 2>/dev/null; sleep 1", shell=True)
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if render:
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proc = subprocess.Popen(
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['/usr/bin/reaper', '-nosplash', '-ignoreerrors',
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'-renderproject', rpp],
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stdout=open('/dev/null', 'w'), stderr=subprocess.STDOUT)
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else:
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proc = subprocess.Popen(
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['/usr/bin/reaper', '-nosplash', '-ignoreerrors', rpp,
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'/home/m/re-tools/play_loop.lua'],
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stdout=open('/dev/null', 'w'), stderr=subprocess.STDOUT)
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t0 = time.time()
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host = None
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while time.time() - t0 < 60 and not host:
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host = find_host()
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time.sleep(0.05)
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if not host:
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print('NO HOST')
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return 1
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print('host', host, 'at %.1fs' % (time.time() - t0), flush=True)
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tids = [int(os.path.basename(p)) for p in glob.glob(f'/proc/{host}/task/*')]
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print('tids:', tids, flush=True)
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seized = []
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for tid in tids:
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try:
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ptrace(PTRACE_SEIZE, tid, 0, PTRACE_O_TRACECLONE)
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seized.append(tid)
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except OSError as e:
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print('seize fail', tid, e)
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if not seized:
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return 1
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# stop everyone
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stopped = []
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for tid in seized:
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try:
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ptrace(PTRACE_INTERRUPT, tid)
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os.waitpid(tid, os.WUNTRACED)
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stopped.append(tid)
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except (OSError, ChildProcessError):
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pass
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orig = ptrace(PTRACE_PEEKTEXT, stopped[0], FN)
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cc = (orig & ~0xFF) | 0xCC
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ptrace(PTRACE_POKETEXT, stopped[0], FN, cc)
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print('breakpoint armed at %#x (orig=%#x)' % (FN, orig), flush=True)
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for tid in stopped:
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try:
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ptrace(PTRACE_CONT, tid, 0, 0)
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except OSError:
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pass
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hits = 0
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log = []
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import select
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import time as _t
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t_last = _t.time()
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idle_deadline = float(os.environ.get('FNTRACE_IDLE', '20'))
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while hits < nhits and _t.time() - t_last < idle_deadline:
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try:
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pid, status = os.waitpid(-1, os.WUNTRACED | os.WSTOPPED | os.WNOHANG)
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except ChildProcessError:
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break
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if pid == 0:
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_t.sleep(0.005)
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continue
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sig = status >> 8
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if os.WIFEXITED(pid and status or status) or os.WIFSIGNALED(status):
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# thread/process exited (normal in wine): forget it
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if pid in seized:
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seized.remove(pid)
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if pid in stopped:
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stopped.remove(pid)
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continue
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if not os.WIFSTOPPED(pid):
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continue
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t_last = _t.time()
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ev = status >> 16
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if ev == PTRACE_EVENT_CLONE or ev == PTRACE_EVENT_FORK:
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if pid not in seized:
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seized.append(pid)
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ptrace(PTRACE_CONT, pid, 0, 0)
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continue
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if sig == signal.SIGTRAP:
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regs = UserRegs()
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try:
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ptrace(PTRACE_GETREGS, pid, 0, ctypes.addressof(regs))
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except OSError:
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ptrace(PTRACE_CONT, pid, 0, 0)
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continue
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if regs.rip - 1 == FN:
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ret = ptrace(PTRACE_PEEKDATA, pid, regs.rsp)
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rec = dict(rip=regs.rip - 1, ctx=regs.rcx, a2=regs.rdx,
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cnt=regs.r8 & 0xffffffff, r9=regs.r9 & 0xffffffff,
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ret=ret, tid=pid,
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rbx=regs.rbx, rbp_=regs.rbp, rsi=regs.rsi, rdi=regs.rdi)
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log.append(rec)
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hits += 1
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print(f'hit {hits}: tid={pid} ctx={regs.rcx:#x} '
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f'a2={regs.rdx:#x} cnt={regs.r8:#x} r9d={regs.r9:#x} '
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f'ret={ret:#x}', flush=True)
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# step over int3
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lo = struct.unpack('<Q', struct.pack('<Q', orig ^ ((orig ^ cc) & 0xFF)))[0]
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ptrace(PTRACE_POKETEXT, pid, FN, orig)
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regs.rip = FN
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ptrace(PTRACE_SETREGS, pid, 0, ctypes.addressof(regs))
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ptrace(PTRACE_SINGLESTEP, pid, 0, 0)
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os.waitpid(pid, os.WUNTRACED)
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ptrace(PTRACE_POKETEXT, pid, FN, cc)
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ptrace(PTRACE_CONT, pid, 0, 0)
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else:
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ptrace(PTRACE_CONT, pid, 0, 0)
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else:
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# other stop signals: deliver and continue
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ptrace(PTRACE_CONT, pid, 0, sig if 0 < sig < 0x20 else 0)
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# cleanup: remove breakpoint, detach
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print('done hits=', hits, 'cleaning up...', flush=True)
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for tid in seized:
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try:
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ptrace(PTRACE_INTERRUPT, tid)
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os.waitpid(tid, os.WUNTRACED)
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except (OSError, ChildProcessError):
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continue
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try:
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ptrace(PTRACE_POKETEXT, stopped[0], FN, orig)
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except Exception as e:
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print('restore fail', e)
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for tid in seized:
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try:
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ptrace(PTRACE_DETACH, tid, 0, 0)
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except OSError:
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pass
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import json
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json.dump(log, open(f'{SNAPDIR}/hits.json', 'w'), indent=1)
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print('saved', f'{SNAPDIR}/hits.json')
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if proc.poll() is None:
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proc.kill()
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return 0
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if __name__ == '__main__':
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sys.exit(main())
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