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#!/usr/bin/env python3
# r673: find the push page. Patterns: ring entry raw qwords, the sem VA, and
# method-stream signatures. Dump contexts.
import numpy as np, struct, os, time
RAM="/dev/shm/vgpu-guest-ram"
img=open(RAM,"rb"); fsz=os.path.getsize(RAM)
def gpa2off(pa):
if pa < 0x80000000: return pa
if pa < 0x180000000: return 0x80000000+(pa-0x100000000)
return None
def off2gpa(off):
return off if off < 0x80000000 else 0x100000000+(off-0x80000000)
def rd(pa,n):
off=gpa2off(pa)
if off is None or off+n>fsz: return None
img.seek(off); return img.read(n)
pats=[
("entry0raw", 0x0005980004500000),
("entry1raw", 0x0000040004500598),
("entry2raw", 0x0003d0000450059c),
("sem_va", 0x4500598),
("sem_va2", 0x450059c),
("m20038090", 0x20038090),
("push_va", 0x4500000),
]
CH=64<<20
for name,pat in pats:
hits=[]
t0=time.time()
for pos in range(0,fsz,CH):
img.seek(pos); d=img.read(min(CH,fsz-pos))
n=len(d)//8
a=np.frombuffer(d[:n*8],dtype=np.uint64)
idx=np.nonzero(a==np.uint64(pat))[0]
for i in idx: hits.append(pos+int(i)*8)
print("== %s pat=0x%x hits=%d (%.1fs)" % (name,pat,len(hits),time.time()-t0))
for off in hits[:12]:
gpa=off2gpa(off); page=gpa&~0xfff
d=rd(page,0x1000)
ro=gpa-page
s=max(0,ro-24); e=min(0x1000,ro+40)
print(" gpa=0x%x page=0x%x off=0x%x ctx=%s" % (gpa,page,ro,d[s:e].hex() if d else "?"))
if len(hits)>12: print(" ... %d more" % (len(hits)-12))
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