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#!/usr/bin/env python3
"""Is the declared cmd_buf_len enforced at all?
LOAD_TA accepts cmd_buf_len = 0. If a TA then still writes into the buffer, the declared
length is not a bound the PSP enforces -- meaning the earlier "no writes past the declared
window" result reflected TAs writing little, not the platform enforcing anything.
AUC cmd 5 is the probe: it writes ~158 dwords with a normal window.
"""
import glob, struct, sys, time
sys.path.insert(0,'/root/psp/hw')
from tinygrad import Device
import tinygrad.runtime.autogen.am.am as am
from ring_wrap import install
adev=Device["AMD"].iface.dev_impl; psp=adev.psp
submit=install(psp,adev)
PAT=0xA5A5A5A5
def alloc(n):
pa=adev.mm.palloc(n,align=0x1000,zero=True,boot=False); return pa,adev.paddr2mc(pa)
blob=open(glob.glob('/root/psp/contall/ta_16-0-0-9_9e9044cf*')[0],'rb').read()
def run(decl):
ap_,amc=alloc(0x80000); cp,cmc=alloc(0x8000)
n=(len(blob)+3)&~3
adev.vram.view(ap_,n)[:]=blob+b'\x00'*(n-len(blob)); adev.gmc.flush_hdp()
c=am.struct_psp_gfx_cmd_resp(cmd_id=am.GFX_CMD_ID_LOAD_TA); t=c.cmd.cmd_load_ta
t.app_phy_addr_lo,t.app_phy_addr_hi=amc&0xFFFFFFFF,amc>>32; t.app_len=len(blob)
t.cmd_buf_phy_addr_lo,t.cmd_buf_phy_addr_hi=cmc&0xFFFFFFFF,cmc>>32; t.cmd_buf_len=decl
try: r=submit(c); st=r.resp.status&0xFFFFFFFF; sid=r.resp.session_id
except Exception as e: print(' load failed %s'%str(e)[:50]); return
buf=bytearray(struct.pack('<I',PAT)*(0x8000//4)); struct.pack_into('<I',buf,0,5)
adev.vram.view(cp,0x8000)[:]=bytes(buf); adev.gmc.flush_hdp()
c=am.struct_psp_gfx_cmd_resp(cmd_id=am.GFX_CMD_ID_INVOKE_CMD)
iv=c.cmd.cmd_invoke_cmd; iv.session_id,iv.ta_cmd_id=sid,5
t0=time.time()
try: r=submit(c); s=r.resp.status&0xFFFFFFFF
except Exception as e:
try: s=int(str(e).strip().split()[-1])&0xFFFFFFFF
except Exception: s=-1
dt=time.time()-t0
adev.gmc.flush_hdp()
out=bytes(adev.vram.view(cp,0x8000)[:])
changed=[o for o in range(4,0x8000,4) if struct.unpack_from('<I',out,o)[0]!=PAT]
hi=max(changed) if changed else 0
print(' decl=%#-9x load=%#-6x invoke=%#-10x %5.1fs dwords changed=%-4d highest=%#x%s'
%(decl,st,s,dt,len(changed),hi,' <<< HANG' if dt>5 else ''), flush=True)
for d in (0x1000, 0x0):
run(d)
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