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#!/usr/bin/env python3
# walk.py - host-side replica of the service's svc_gmmu_walk + pd_discover,
# run against /dev/shm/vgpu-guest-ram. Discovers the page directory that
# reproduces the service's map[] sample pairs, then walks the ring/window
# VAs through it.
import mmap, struct, sys
F = "/dev/shm/vgpu-guest-ram"
SEMA_PA_MAX = 0x180000000
# samples from the r690 dmesg map[] lines
SAMPLES = [
(0x100000000, 0x100326000),
(0x100e2f000, 0x10096e000),
(0x100e33000, 0x10096b000),
(0x100e34000, 0x10096a000),
(0x100e35000, 0x100969000),
(0x100e37000, 0x102dcb000),
(0x100e38000, 0x102dca000),
(0x100e39000, 0x102dc9000),
]
TARGET_VAS = [0x44a0000, 0x4500000, 0x4560000, 0x4480000, 0x4485000,
0x4ca0000, 0x4ca5000, 0x4d00000, 0x4b17000, 0x4020000,
0x4100000, 0x4160000]
mm = None
def off(pa):
return pa if pa < 0x80000000 else pa - 0x80000000
def rd(pa, n=8):
if pa + n > SEMA_PA_MAX:
return None
try:
d = mm[off(pa):off(pa)+n]
return d if len(d) == n else None
except Exception:
return None
def rd64(pa):
d = rd(pa, 8)
return None if d is None else int.from_bytes(d, "little")
def pde_aperture(ap):
if ap == 1: return "FB"
if ap in (2, 3): return "SYS"
return None
def pte_aperture(ap):
if ap == 0: return "FB"
if ap == 1: return None
return "SYS"
def pte_addr(e, fb):
if fb:
return ((e >> 8) & 0x1FFFFFF) << 12
return ((e >> 8) & 0x3FFFFFFFFFFF) << 12
def pte_leaf(table, idx):
e = rd64(table + 8 * idx)
if e is None or not (e & 1):
return None
ap = pte_aperture((e >> 1) & 0x3)
if ap is None:
return None
a = pte_addr(e, ap == "FB")
if not fb_ok(a):
return None
return a, ap
def fb_ok(a):
return a + 8 <= SEMA_PA_MAX
def walk(va):
table = None
# root_bits = ilog2(entries=4) = 2; shift = 49-2 = 47
e = rd64(table) if False else None
# level 0
idx = (va >> 47) & 0x3
# root table is the candidate itself (passed separately)
return None
def walk_from(pdb, va, trace=False):
table = pdb
for level in range(3):
if level == 0:
bits, shift = 2, 47
else:
bits, shift = 9, 38 if level == 1 else 29
idx = (va >> shift) & ((1 << bits) - 1)
e = rd64(table + 8 * idx)
if e is None:
return None
if trace:
print(" L%d table=0x%x idx=%u e=0x%016x" % (level, table, idx, e))
if e & 1:
return None
ap = pde_aperture((e >> 1) & 0x3)
if ap is None:
return None
table = pte_addr(e, ap == "FB")
if not fb_ok(table):
return None
idx = (va >> 21) & 0xff
big = rd64(table + 16 * idx)
small = rd64(table + 16 * idx + 8)
if big is None or small is None:
return None
if trace:
print(" PD0 table=0x%x idx=%u big=0x%016x small=0x%016x" %
(table, idx, big, small))
if not (small & 1):
sap = pde_aperture((small >> 1) & 0x3)
if sap is not None:
t = pte_addr(small, sap == "FB")
r = pte_leaf(t, (va >> 12) & 0x1ff)
if r:
return r[0] + (va & 0xfff), r[1]
if big & 1:
bap = pte_aperture((big >> 1) & 0x3)
if bap is not None:
a = pte_addr(big, bap == "FB") + (va & ((1 << 21) - 1))
if fb_ok(a):
return a, bap
else:
bap = pde_aperture((big >> 1) & 0x3)
if bap is not None:
t = pte_addr(big, bap == "FB")
r = pte_leaf(t, (va >> 16) & 0x1f)
if r:
return r[0] + (va & 0xffff), r[1]
return None
def main():
global mm
f = open(F, "rb")
mm = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)
size = len(mm)
print("# scanning for directory candidates...")
cands = []
for fo in range(0, size, 4096):
e = int.from_bytes(mm[fo:fo+8], "little")
if e and not (e & 1):
ap = (e >> 1) & 0x3
if ap in (1, 2, 3):
pa = fo if fo < 0x80000000 else fo + 0x80000000
if pa < SEMA_PA_MAX:
cands.append(pa)
print("# candidates: %d" % len(cands))
best = []
for c in cands:
hits = 0
for (sva, spa) in SAMPLES:
r = walk_from(c, sva)
if r and (r[0] & ~0xfff) == (spa & ~0xfff):
hits += 1
if hits >= 2:
best.append((hits, c))
best.sort(reverse=True)
print("# candidates with >=2 hits: %d" % len(best))
for hits, c in best[:10]:
print(" pdb=0x%x hits=%d/8" % (c, hits))
if not best:
return 1
pdb = best[0][1]
print("== walking targets through pdb=0x%x:" % pdb)
for va in TARGET_VAS:
r = walk_from(pdb, va)
if r:
print(" va=0x%x -> pa=0x%x ap=%s" % (va, r[0], r[1]))
else:
print(" va=0x%x -> no translation" % va)
mm.close(); f.close()
return 0
if __name__ == "__main__":
sys.exit(main())
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