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ps2dev / ps2-packer

Create packed ELF files to run on the PS2
GNU General Public License v2.0
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n2e asm stub is sometimes buggy #1

Closed jimmikaelkael closed 12 years ago

jimmikaelkael commented 12 years ago

Some times ago I found out that the n2e unpacker stub from ps2-packer have a bug striking sometimes, depending on the size on the original packed elf. When it happens, simply trying to launch the packed elf ends up with an exception in the n2e unpacker stub (see attached ps2link log and ps2dis capture of the stub. The exception strike during the branch delay slot (at 0x01d001a0).

jimmikaelkael@PC-DE-JIM:~/PS2dev/open-ps2-loader-new$ ps2client execee host:OPNPS2LD.ELF
loadelf: fname host:OPNPS2LD.ELF secname all
loadelf version 3.30
Input ELF format filename = host:OPNPS2LD.ELF
0 01c57060 000a915d ...........
Loaded, host:OPNPS2LD.ELF
start address 0x1d00008
gp address 00000000

           EE Exception handler: TLB load/inst fetch exception

      Cause B0008008  BadVAddr 02000000  Status 70030C13  EPC 01D0019C

zero: 00000000000000000000000000000000   t8: 00000000000000000000000000000000
  at: 00000000000000000000000000000000   t9: 00000000000000000000000001D00024
  v0: 00000000000000000000000000000000   s0: 00000000000000000000000002000000
  v1: 00000000000000000000000000000000   s1: 00000000000000000000000000440DD5
  a0: 000000000000000000000000000EB500   s2: 00000000000000000000000001C57060
  a1: 00000000000000000000000000000000   s3: 0000000000000000000000000019DDA0
  a2: 00000000000000000000000000000000   s4: 0000000000000000000000000029DDA0
  a3: 00000000000000000000000000000000   s5: 00000000000000000000000000000000
  t0: 0000000000000000000000001FE00000   s6: 00000000000000000000000000000000
  t1: 00000000000000000000000000E00000   s7: 00000000000000000000000000000000
  t2: 00000000000000000000000000000001   k0: 00000000000000000000000000000000
  t3: 00000000000000000000000000000000   k1: EDF755BEFF7FEFF80000000000000000
  t4: 00000000000000000000000000000000   gp: 00000000000000000000000000000000
  t5: 00000000000000000000000000000000   sp: 000000000000000000000000000DB320
  t6: 00000000000000000000000000FF0000   fp: 000000000000000000000000000DB320
  t7: 00000000000000000000000000000000   ra: 00000000000000000000000001D00084

ps2dis screenshot: http://imageshack.us/photo/my-images/9/n2eunpackerstubdisasm.png/