top               205 user/usertests.c   uint64 top = (uint64) sbrk(0);
top               206 user/usertests.c   if((top % PGSIZE) != 0){
top               207 user/usertests.c     sbrk(PGSIZE - (top % PGSIZE));
top               209 user/usertests.c   top = (uint64) sbrk(0);
top               210 user/usertests.c   if(top % PGSIZE){
top               215 user/usertests.c   char *b = (char *) (top - 1);
top              2541 user/usertests.c   uint64 top = (uint64) sbrk(0);
top              2542 user/usertests.c   if((top % 4096) != 0)
top              2543 user/usertests.c     sbrk(4096 - (top % 4096));
top              2547 user/usertests.c   top = (uint64) sbrk(0);
top              2548 user/usertests.c   char *p = (char *) (top - 64);
top              2568 user/usertests.c   volatile char *top = sbrk(0);
top              2569 user/usertests.c   *(top-1) = *(top-1) + 1;