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Unknown CPU instructions

 
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dridri



Joined: 31 Jul 2009
Posts: 35

PostPosted: Sun Jul 04, 2010 11:00 pm    Post subject: Unknown CPU instructions Reply with quote

Hi, I found these instructions when reversing ge.prx :
Code:
ext        $t0, $a1, 0, 29
sync
mfic       $v1, $0
mtic       $zr, $0
movz       $t2, $zr, $t3
cache      0x1A, 0($t0)
I asked google but there's no informations about these inst.

If anyone know what these instructions mean....
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I'm French, and 15 years old, so my English is not good...
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Oby1Chick



Joined: 13 Feb 2010
Posts: 24

PostPosted: Wed Jul 07, 2010 12:00 am    Post subject: Re: Unknown CPU instructions Reply with quote

dridri wrote:
Hi, I found these instructions when reversing ge.prx :
Code:
ext        $t0, $a1, 0, 29
sync
mfic       $v1, $0
mtic       $zr, $0
movz       $t2, $zr, $t3
cache      0x1A, 0($t0)
I asked google but there's no informations about these inst.

If anyone know what these instructions mean....


Hey, here are the definitions of those commands :
mfic : Move from IC (interrupt controller)
mtic : Move to IC (interrupt controler)
PS : There are a few special uses of these two functions
mfic $v0, zero to save the interrupt state in v0
mtic zero, zero to disable them
mtic $a0, zero to renable based on the original mask contained in a0

No one knows exactly their purpose though.
I think you know what mean the others, correct me I am wrong.
Good luck,
Oby.
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