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Finding a Driver (in mem) and it's functionlist

 
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Hellcat



Joined: 24 Jan 2007
Posts: 84
PostPosted: Sat Feb 09, 2008 7:41 pm    Post subject: Finding a Driver (in mem) and it's functionlist Reply with quote
Hi there.

I want to find/locate a driver (MS, for example) in the memory during runtime and it's functions list.

Reasons are that for one project I want to call functions of the driver that don't have wrappers in the usual sceIo....() functions - at least not to my knowledge. (IoInit() would be one) - and for another app, I'd like to hook some (like done when doing flash-over-USB, but for something else).

I already have this snippet, which I also have successfully used:
Code:
PspIoDrv *FindDriver(char *drvname)
{
  u32 *mod = (u32 *)sceKernelFindModuleByName("sceIOFileManager");

  if (!mod)
  {
    return NULL;
  }

  u32 text_addr = *(mod+27);

  u32 *(* GetDevice)(char *) = (void *)(text_addr+0x16D4);
  u32 *u;

  u = GetDevice(drvname);

  if (!u)
  {
    return NULL;
  }

  return (PspIoDrv *)u[1];
}


But due to the hardcoded offsets this only works on 1.50 - but I'd like my stuff running on every FW.... well at least 3.xx CFWs.

So, I need a more generic way of finding the driver and it's functions list.


Anyone be willing to hint me into the right direction? :)
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moonlight



Joined: 26 Oct 2005
Posts: 567
PostPosted: Sat Feb 09, 2008 8:49 pm    Post subject: Reply with quote
CFW exports the function sctrlHENFindDriver that does what you want. (and thus, you don't need to use specific text_addr that differ between firmware versions). Given a driver name (without ":"), it will return a pointer to it (or NULL if no found).

Note that although the function can be called from user mode too, the returned pointer can only be manipulated by kernel code.
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