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How to hook sceGuFinish???

 
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iceman755



Joined: 21 Jul 2008
Posts: 34
PostPosted: Thu Aug 13, 2009 7:21 am    Post subject: How to hook sceGuFinish??? Reply with quote
After reading a lot about blitting on the XMB, I got that I have to hook sceGuFinish to do Gu things over the XMB, but No matter what I do, I can't get that function hooked.

I have two conclusion for my issue: the first one is that I'm using wrong module and library names (the NID for 5.00 was given by Silverspring in a post over this forum). The second conclusion is, if module and library names are correct, then maybe sceGuFinish is never call by the XMB.

This is the code I'm using to test if the function is being hooked:
Code:
#include <pspsdk.h>
#include <pspkernel.h>
#include <pspgu.h>
#include <systemctrl.h>
#include <stdio.h>
#include <string.h>

PSP_MODULE_INFO("test", 0x1000, 1, 0);

void myGuFinish()
   {
      int k1 = pspSdkSetK1(0);
      
      sceGuClearColor(GU_RGBA(255, 255, 255, 255));
      
      sceGuClear(GU_COLOR_BUFFER_BIT);
      
      pspSdkSetK1(k1);
      
      sceGuFinish();
   }

STMOD_HANDLER previous = NULL;
u32 orgaddr;

int OnModuleStart(SceModule2 *mod)
   {   
      if (strcmp(mod->modname, "scePaf_Module") == 0)
         {   
            orgaddr=sctrlHENFindFunction("scePaf_Module", "scePaf", 0x4170FB8F);
            sctrlHENPatchSyscall(orgaddr, myGuFinish);
   
            sceKernelDcacheWritebackAll();
            sceKernelIcacheClearAll();
         }
   
      if (!previous)
         return 0;
   
      return previous(mod);
   }

int module_start(SceSize args, void *argp)
{   
   previous = sctrlHENSetStartModuleHandler(OnModuleStart);
   
   return 0;
}


I'm hopping this code to clear the screen in white but nothing happens, no white screen, no errors, no crash, nothing.
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crazyc



Joined: 17 Jun 2005
Posts: 410
PostPosted: Thu Aug 13, 2009 11:09 am    Post subject: Reply with quote
You can't because sceGuFinish is not a kernel function. It only places a finish command in the display list. Try hooking sceGeListUpdateStallAddr instead.
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ab5000



Joined: 06 May 2008
Posts: 74
PostPosted: Thu Aug 13, 2009 5:20 pm    Post subject: Reply with quote
yes, you can hook a user mode function, but not in that way. search "easy hook example user kernel" in this forum.
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int _(int __,int ___,int ____,int _____)
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crazyc



Joined: 17 Jun 2005
Posts: 410
PostPosted: Fri Aug 14, 2009 12:59 am    Post subject: Reply with quote
ab5000 wrote:
yes, you can hook a user mode function, but not in that way. search "easy hook example user kernel" in this forum.
If he did want to override sceGuFinish, he could just change the order by linking his function before libgu, but that wouldn't enable him to do what he said he wanted.
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