Editing Making Isolated SPU Modules and Loaders

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[[Category:OtherOS]]
=Introduction=
=Introduction=


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* You need SPU GCC compiler to compile your code and create binary version of it.
* You need SPU GCC compiler to compile your code and create binary version of it.
* On PS3 Debian, just install spu toolchain with aptitude.
* On PS3 Debian, just install spu toolchain.
* You can also cross-compile SPU GCC toolchain for your Linux PC.
* You can also cross-compile SPU GCC toolchain for your Linux PC.
* See http://gitorious.ps3dev.net/ps3linux/powerpc64-cross-compiler if you want to build SPU GCC cross-compiler. Just change in HOWTO target option from powerpc64-linux to spu-elf.
* See http://gitorious.ps3dev.net/ps3linux/powerpc64-cross-compiler if you want to build SPU GCC cross-compiler. Just change in HOWTO target option from powerpc64-linux to spu-elf.
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hexdump -C /mnt/arg1
hexdump -C /mnt/arg1
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=Example: Making dump_encdec_keys.self=
=Example: Making dump_encdec_keys.self=
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mv lv1ldr.elf dump_encdec_keys.elf
mv lv1ldr.elf dump_encdec_keys.elf


# print program header of decrypted loader
# print program header of decrypted SPU module
 
glevand@debian:~$ readelf -l dump_encdec_keys.elf
readelf -l dump_encdec_keys.elf


Elf file type is EXEC (Executable file)
Elf file type is EXEC (Executable file)
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   02    .unknown .unknown .unknown  
   02    .unknown .unknown .unknown  


# entry point is 0x12c00 which is in second program segment at file offset 0x100
# entry point is 0x12c00 which is in first program segment at file offset 0x100


# now we kill all old code and data with 0s before we put our code there.
# now we kill all old code and data with 0s before we put our code there.
# seek parameter is the offset of the second program segment.
# seek parameter is the offset of the first program segment.
# count parameter is the sum of the offset of the last program segment plus its size and
# count parameter is the sum of the offset of the last program segment plus its size and
# minus the offset of the second program segment.
# minus the offset of the first program segmnet.


# killing old code and data with 0s is a good idea because 0x00000000 means stop opcode.
# killing old code and data with 0s is a good idea because 0x00000000 means stop opcode.
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         ...
         ...


# now we copy our code to loader
# now we copy our code to SPU module
# seek parameter is the entry point offset in file
# seek parameter is the entry point offset in file


dd if=dump_encdec_keys.bin of=dump_encdec_keys.elf bs=1 seek=$((0x100)) conv=notrunc
dd if=dump_encdec_keys.bin of=dump_encdec_keys.elf bs=1 seek=$((0x100)) conv=notrunc


# now build loader
# now build isolated SPU module


iso_rebuilder dump_encdec_keys.elf dump_encdec_keys.self lv1ldr
iso_rebuilder dump_encdec_keys.elf dump_encdec_keys.self lv1ldr
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# encrypted and accepted by metldr
# encrypted and accepted by metldr


# dump your ENCDEC keys (not really, you have to calculate your ENCDEC keys)
# dump your ENCDEC keys


hexdump -C /mnt/buf2
hexdump -C /mnt/buf2
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{{Linux}}<noinclude>[[Category:Main]]</noinclude>
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