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Passing arguments to a Kernel module. How?

 
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Stewie87



Joined: 03 Apr 2008
Posts: 39
PostPosted: Tue Apr 06, 2010 8:02 am    Post subject: Passing arguments to a Kernel module. How? Reply with quote
First of all, sorry for my poor English... :P
I made a User-Mode homebrew which, at a certain point, loads a kernel module (PRX). This kernel module has the only purpose to start a EBOOT.PBP (thing that does not work in usermode).
Now, my problem is that I have to give to kernel module the path of the EBOOT.PBP to start. So, essentially, in (usermode) homebrew I have to pass to (kernelmode) PRX an argument.

This is the code of my (Kernel-mode) PRX:
Code:
int threadMain(SceSize args, void *argp)
{
   exec(...);
   return 0;
}

int module_start(SceSize args, void *argp)
{
   main_thid = sceKernelCreateThread("hbb_main", threadMain, 6, 0x800, 0, NULL);
   if(main_thid >= 0) sceKernelStartThread(main_thid, args, argp);
   return 0;
   sceKernelExitDeleteThread(0);
}

int module_stop(SceSize args, void *argp)
{
   return 0;
}


And, in the (usermode) homebrew I load the module with:
Code:
int build_args(char *args, const char *execfile, int argc, char **argv)
{
   int loc = 0;
   int i;

   strcpy(args, execfile);
   loc += strlen(execfile) + 1;
   for(i = 0; i < argc; i++)
   {
      strcpy(&args[loc], argv[i]);
      loc += strlen(argv[i]) + 1;
   }

   return loc;
}

int loadStartModule(const char *name, int argc, char **argv)
{
   SceUID modid;
   int status;
   char args[128];
   int len;

   modid = sceKernelLoadModule(name, 0, NULL);
   if(modid >= 0)
   {
      len = build_args(args, name, argc, argv);
      modid = sceKernelStartModule(modid, len, (void *) args, &status, NULL);
   }
   return modid;
}


So I have to give to exec(...) function the path of the EBOOT.PBP to start.
I tried to use char *argv[] like main functions, but sceKernelStartModule() use void* and don't accept any type of my arguments :S

In what way i could give my path to exec(...) from the hombrew? Thx
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willow :--)



Joined: 13 Jan 2007
Posts: 126
PostPosted: Tue Apr 06, 2010 8:14 am    Post subject: Reply with quote
just cast your arguments as void *
if you pass a string, args is the size of the string afaik

http://psp.jim.sh/pspsdk-doc/group__ModuleMgr.html#g69c3f128b68a8b0ec89fb1f17a5bd5b5
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psPea



Joined: 01 Sep 2007
Posts: 64
PostPosted: Tue Apr 06, 2010 8:14 am    Post subject: Reply with quote
how about exporting exec(...) from your kernel module and calling it from your app
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carl0sgs



Joined: 10 Dec 2009
Posts: 41
PostPosted: Tue Apr 06, 2010 8:24 am    Post subject: Reply with quote
I did it like this:

Sending the string to the module:
int runPRX(char *path, SceSize args, void *argp) {//Load and start module
SceUID mod = sceKernelLoadModule(path, 0, NULL);
if (mod > 0) {
return sceKernelStartModule(mod, args, argp, NULL, NULL);
}
return 0;
}

And in your code:
char path[500];
sprintf(path, "ms0:/eboot.pbp");
runPRX("ms0:/yourmodule.prx",strlen(path)+1,path);//+1 is important (\0 character).


Receiving the string in the module:
int threadMain(SceSize args, void *argp)
{
if(args > 0) {
char path[args];
sprintf(path,argp);
//The path you want is in "path"
exec(path);
return 0;
}

Hope it helped :-P
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carl0sgs



Joined: 10 Dec 2009
Posts: 41
PostPosted: Tue Apr 06, 2010 8:25 am    Post subject: Reply with quote
double post sorry ><
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Stewie87



Joined: 03 Apr 2008
Posts: 39
PostPosted: Tue Apr 06, 2010 8:43 am    Post subject: Reply with quote
carl0sgs wrote:
I did it like this:

Sending the string to the module:
int runPRX(char *path, SceSize args, void *argp) {//Load and start module
SceUID mod = sceKernelLoadModule(path, 0, NULL);
if (mod > 0) {
return sceKernelStartModule(mod, args, argp, NULL, NULL);
}
return 0;
}

And in your code:
char path[500];
sprintf(path, "ms0:/eboot.pbp");
runPRX("ms0:/yourmodule.prx",strlen(path)+1,path);//+1 is important (\0 character).


Receiving the string in the module:
int threadMain(SceSize args, void *argp)
{
if(args > 0) {
char path[args];
sprintf(path,argp);
//The path you want is in "path"
exec(path);
return 0;
}

Hope it helped :-P


Wow, it worked and on first attempt! Thank you very much :)
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carl0sgs



Joined: 10 Dec 2009
Posts: 41
PostPosted: Tue Apr 06, 2010 3:27 pm    Post subject: Reply with quote
You are welcome ;-)
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