PRX & Moduling Help

Devun_06 · Post by **Devun_06** » Sat Jun 17, 2006 7:14 pm

I'm trying to get my homebrew to load other eboots and call itself back up upon the exiting of the eboot my homebrew has loaded, but so far... I can't even tackle my first attempt at this moduling thing... can some one help me with this... my code doesn't look wrong to me.

Execution:

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//////////////////////Loading a PRX
int LoadAndStartModule_PRX&#40;char *ModuleFILE, int UserMode&#41;//UserMode mode&#58; 1==true; 0 == false;
&#123;//start moduling
SceKernelLMOption moduleprx;
                  moduleprx.mpidtext = &#40;UserMode+1&#41;;// 2 is equivalent to usermode ;&#41;
                  moduleprx.mpiddata = &#40;UserMode+1&#41;;// 2 is equivalent to usermode ;&#41;
                  moduleprx.position = 0;
                  moduleprx.access = 1;
                  moduleprx.size = sizeof&#40;moduleprx&#41;;
SceUID PrxID=0;
PrxID = sceKernelLoadModuleMs&#40;ModuleFILE,0,UserMode > 0 ? &moduleprx &#58; NULL&#41;;// If in usermode, don't call as NULL >&#58;// this carrys MS for Memory Stick ;&#41;
int prxstatus=-1;
if&#40; &#40; sceKernelStartModule &#40;PrxID, 0,NULL,&prxstatus,NULL&#41; &#41; !=0&#41;// it was &#58;if&#40; &#40; sceKernelStartModule &#40;PrxID, 0,NULL,&prxstatus,moduleprx&#41; &#41; !=0&#41;
&#123;//I think this is an okay error check<-
    //do nothing until necessary... &#58;&#41;, but this is on an errors existance
&#125;//last argument is 0 for usermode! #3 is NULL becaus it's okay, and I don't know wtf it's it's honestly asking for... &#58;'&#40;
//Finish MODULING&#58; Stop & Unload Relative MODULE
sceKernelStopModule&#40;PrxID, 0, NULL,&prxstatus,NULL&#41;;// it was&#58;sceKernelStopModule&#40;PrxID, 0, NULL,&prxstatus,moduleprx&#41;;
sceKernelUnloadModule&#40;PrxID&#41;;
return prxstatus;
&#125;//end moduling
//////////////////////Loading a PRX

Preperation:

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if&#40;Controller.Buttons & PSP_CTRL_LTRIGGER&#41;&#123;LoadAndStartModule_PRX&#40;"ms0&#58;/XT1_Module.prx", 0&#41;;&#125;

* I'm using the Sample PRX Renamed.
* It's in the right directory.
* After changing the name read in the sample loader, the PRX tested as *Working*

Thank You!!

moonlight · Post by **moonlight** » Sat Jun 17, 2006 7:34 pm

I suppose that you have previously called pspSdkInstallNoPlainModuleCheckPatch (which requires kernel mode), right?

Also, if you call pspSdkInstallNoDeviceCheckPatch, you wouldn't need the sceKernelLoadModuleMs, the normal sceKernelLoadModule would work better.
It seems that the sceKernelLoadModuleMs has problems in loading user mode prx's (no problems with kernel ones), that's why you should use sceKernelLoadModule instead.

Devun_06 · Post by **Devun_06** » Sun Jun 18, 2006 6:48 am

moonlight wrote:I suppose that you have previously called pspSdkInstallNoPlainModuleCheckPatch (which requires kernel mode), right?

Also, if you call pspSdkInstallNoDeviceCheckPatch, you wouldn't need the sceKernelLoadModuleMs, the normal sceKernelLoadModule would work better.
It seems that the sceKernelLoadModuleMs has problems in loading user mode prx's (no problems with kernel ones), that's why you should use sceKernelLoadModule instead.

Thanks

subbie · Post by **subbie** » Tue Jun 20, 2006 1:19 am

I have a minor prx question. How do you figure out the STUB info to use in the program that loads the prx?

Post by **TyRaNiD** » Tue Jun 20, 2006 2:29 am

subbie, make your export.exp with the functions you want to export then do psp-build-exports -s export.exp and that will spit out a file with LibName.S where libname is the name of your library you specified in the export.exp file. Then just copy that across to your loader application and add it to your makefile.

subbie · Post by **subbie** » Tue Jun 20, 2006 2:50 am

TyRaNiD wrote:subbie, make your export.exp with the functions you want to export then do psp-build-exports -s export.exp and that will spit out a file with LibName.S where libname is the name of your library you specified in the export.exp file. Then just copy that across to your loader application and add it to your makefile.

Sweet, Thanks !! :D

Devun_06 · Post by **Devun_06** » Thu Jul 27, 2006 5:22 am

Okay, I've made the necessary changes now, but I'm still not getting anything to boot from it except now the PSP doesn't crash unless I release the error codes as comments. What exactly is messing up my code now?

Code: Select all

int LoadAndStartModule_PRX&#40;char *ModuleFILE, int UserMode&#41;//UserMode mode&#58; 1==true; 0 == false;
&#123;//start moduling
//**ERROR INSTALL HANDLERS**\//
//pspDebugInstallKprintfHandler&#40;NULL&#41;;
//pspDebugInstallErrorHandler&#40;NULL&#41;;
//pspDebugInstallStdoutHandler&#40;pspDebugScreenPrintData&#41;;
//pspSdkInstallNoPlainModuleCheckPatch&#40;&#41;;//uses &#58; #include <pspsdk.h>
SceKernelLMOption moduleprx;
                  moduleprx.mpidtext = &#40;UserMode+1&#41;;// 2 is equivalent to usermode ;&#41;
                  moduleprx.mpiddata = &#40;UserMode+1&#41;;// 2 is equivalent to usermode ;&#41;
                  moduleprx.position = 0;
                  moduleprx.access = 1;
                  moduleprx.size = sizeof&#40;moduleprx&#41;;
SceUID PrxID=0;
PrxID = sceKernelLoadModule&#40;ModuleFILE,0,UserMode > 0 ? &moduleprx &#58; NULL&#41;;// If in usermode, don't call as NULL >&#58; 
int prxstatus=-1;
if&#40; &#40; sceKernelStartModule &#40;PrxID, 0,NULL,&prxstatus,NULL&#41; &#41; !=0&#41;// it was &#58;if&#40; &#40; sceKernelStartModule &#40;PrxID, 0,NULL,&prxstatus,moduleprx&#41; &#41; !=0&#41;
&#123;//I think this is an okay error check<-
    //do nothing until necessary... &#58;&#41;, but this is on an errors existance
&#125;//last argument is 0 for usermode! #3 is NULL because it's okay, and I don't know what it's honestly asking for... &#58;'&#40;
//Finish MODULING&#58; Stop & Unload Relative MODULE
sceKernelStopModule&#40;PrxID, 0, NULL,&prxstatus,NULL&#41;;// it was&#58;sceKernelStopModule&#40;PrxID, 0, NULL,&prxstatus,moduleprx&#41;;
sceKernelUnloadModule&#40;PrxID&#41;;
return prxstatus;
&#125;//end moduling