Odd things with threads

So, I've been trying to use threads for audio streaming and it's been going slowly.

For some reason argp (which I use to pass my struct) gets mangled, and I'm not seeing why.

I wrote a simple app to test the pointers, here it is:
#include <pspkernel.h>
#include <pspdisplay.h>
#include <pspdebug.h>
#include <pspctrl.h>
#include "callbacks.h"

PSP_MODULE_INFO("ThreadTest", 0, 1, 1);
PSP_MAIN_THREAD_ATTR(THREAD_ATTR_USER | PSP_THREAD_ATTR_VFPU);

#define printf pspDebugScreenPrintf

int test_thread(SceSize args, void *argp)
{
printf("argp = %p\n", argp);
return 0;
};

int main(int argc, char *argv[])
{
pspDebugScreenInit();
setupCallbacks();

int thid = sceKernelCreateThread("test_thread", test_thread, 0x10, 0x400*24, PSP_THREAD_ATTR_USER, NULL);
int *p = &thid;
if(thid >= 0)
{
printf("thid pointer = %p\n", &p);
sceKernelStartThread(thid, 4, p);
}

sceKernelSleepThreadCB();

return 0;
};

I get the following output:

thid pointer = 0x9fbfe24
argp = 0x9ffeef0

any help would be great, thanks.

EDIT: code tags don't work...

EDIT:solved, turns out sceKernelStartThread doesn't just pass the pointer it memcopies it to a new location