src/tests/userprog/sc-boundary-2.c

   1 /* Invokes a system call with one byte of the system call's
   2    argument on a separate page from the rest of the bytes.  This
   3    must work. */
   4
   5 #include <syscall-nr.h>
   6 #include "tests/userprog/boundary.h"
   7 #include "tests/lib.h"
   8 #include "tests/main.h"
   9
  10 void
  11 test_main (void)
  12 {
  13   /* Make one byte of a syscall argument hang over into a second
  14      page. */
  15   int *p = (int *) ((char *) get_boundary_area () - 7);
  16   p[0] = SYS_EXIT;
  17   p[1] = 67;
  18
  19   /* Invoke the system call. */
  20   asm volatile ("movl %0, %%esp; int $0x30" : : "g" (p));
  21   fail ("should have called exit(67)");
  22 }