# SPDX-License-Identifier: BSD-3-Clause
# Copyright (c) 2026 Open-IOV contributors
# gdb script: at the libcuda error-scanner entry (FUN_0054fa00), walk the
# context list and dump every non-zero RM error record (magic words,
# errorClass at +0x8, shorts at +0xc/+0xe). The scanner is called often with
# a zeroed record; keep going until a hit has a non-zero record (that is the
# one a forced 999 comes from) and print it with a backtrace.
# Run: sudo gdb -p <cdt-pid> -batch -x /tmp/scanerr.py
import gdb

out = gdb.execute("info proc mappings", to_string=True)
base = None
for line in out.splitlines():
    if "libcuda" in line and "r-xp" in line:
        f = line.split()
        base = int(f[0], 16) - int(f[3], 16)
        break
print("BASE=0x%x" % (base or 0))
if base is None:
    raise SystemExit

gdb.execute("set pagination off")
gdb.execute("set confirm off")
gdb.execute("break *0x%x" % (base + 0x44fa00))


def rd64(a):
    try:
        return int(gdb.parse_and_eval("*(unsigned long *)0x%x" % a)) & 0xffffffffffffffff
    except Exception:
        return None


def rd32(a):
    try:
        return int(gdb.parse_and_eval("*(unsigned int *)0x%x" % a)) & 0xffffffff
    except Exception:
        return None


for hit in range(400):
    try:
        gdb.execute("continue")
    except gdb.error as e:
        print("CONTINUE_END %s" % e)
        break
    try:
        p1 = int(gdb.parse_and_eval("$rdi")) & 0xffffffffffffffff
        p2 = int(gdb.parse_and_eval("$rsi")) & 0xffffffff
    except Exception:
        print("REGS_GONE")
        break
    pl = rd64(p1)
    n = 0
    found = 0
    while pl and n < 64:
        mgr = rd64(pl + 0x1291 * 8)
        if mgr:
            reg = rd64(mgr + 0x10)
            if reg:
                rec = rd64(reg + 0x10)
                if rec:
                    vals = [rd32(rec + i) or 0 for i in range(0, 0x28, 4)]
                    if any(vals):
                        print("HIT %d param_2=%d ENTRY %d ctx=0x%x mgr=0x%x rec=0x%x rec=%s" %
                              (hit, p2, n, pl, mgr, rec,
                               ' '.join('0x%08x' % v for v in vals)))
                        found = 1
        pl = rd64(pl + 0x128e * 8)
        n += 1
    if found:
        print("FOUND")
        try:
            print(gdb.execute("bt 12", to_string=True))
        except Exception:
            pass
        break
print("DONE")
try:
    gdb.execute("detach")
except Exception:
    pass