#include<stdio.h> 
#include<errno.h> 
#include<sys/types.h> 
#include<sys/stat.h> 
#include<unistd.h> 
#include<sys/mman.h> 
#include<string.h> 
#include<fcntl.h> 

// gcc -static -Wl,-Ttext=0x10000000 -o paefun paefun.c && ./paefun

char buf[1000];
int main(int argc, char *argv[])
{
	int *addr;
	int i;
	sprintf(buf, "cat /proc/%d/maps; echo", getpid());
	system(buf);
	addr = mmap(0x40000000, 0x10000, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
	*addr = 10;
	system(buf);
	munmap(addr, 0x10000);
	printf("addr: %p\n", addr);
	system(buf);
}

/*
throw some junk like this in task_mmu.c's m_start:

pgd_t *pgd;
pgd = pgd_offset(priv->task->mm, 0);
for (i = 0; i < PTRS_PER_PGD; i++) {
	printk("pgd[%d]: %016Lx\n", i, *(u64 *)&pgd[i]);
}
*/