#include <pspkernel.h>
#include <psploadexec.h>

PSP_MODULE_INFO("modulename", 0x1006, 1, 1);
PSP_MAIN_THREAD_ATTR(0);

...

int retval()
{
 const char * tmp = "ms0:/PSP/GAME/THEOTHERAPP/EBOOT.PBP";
 int i = 0;

 struct SceKernelLoadExecParam EBOOTPBP;
 const u32 Total_Length = strlen(tmp)+1;

 EBOOTPBP.args = Total_Length;
 EBOOTPBP.argp = tmp;
 EBOOTPBP.key = NULL;
 EBOOTPBP.size = sizeof(EBOOTPBP)+Total_Length;
 i = sceKernelLoadExec(tmp,&EBOOTPBP);

 
 return i;
}

...

MAIN APP CODE:

...

printf("%p\n", retval()); //prints =0x8002013A (Library not linked yet)

...