gcc/testsuite/gcc.c-torture/execute/20001229-1.c

   1 /* This testcase originally provoked an unaligned access fault on Alpha.
   2
   3    Since Digital Unix and Linux (and probably others) by default fix
   4    these up in the kernel, the failure was not visible unless one
   5    is sitting at the console examining logs.
   6
   7    So: If we know how, ask the kernel to deliver SIGBUS instead so
   8    that the test case visibly fails.  */
   9
  10 #if defined(__alpha__) && defined(__linux__)
  11 #include <asm/sysinfo.h>
  12 #include <asm/unistd.h>
  13
  14 static inline int
  15 setsysinfo(unsigned long op, void *buffer, unsigned long size,
  16            int *start, void *arg, unsigned long flag)
  17 {
  18   syscall(__NR_osf_setsysinfo, op, buffer, size, start, arg, flag);
  19 }
  20
  21 static void __attribute__((constructor))
  22 trap_unaligned(void)
  23 {
  24   unsigned int buf[2];
  25   buf[0] = SSIN_UACPROC;
  26   buf[1] = UAC_SIGBUS | UAC_NOPRINT;
  27   setsysinfo(SSI_NVPAIRS, buf, 1, 0, 0, 0);
  28 }
  29 #endif /* alpha */
  30
  31 void foo(char *a, char *b) { }
  32
  33 void showinfo()
  34 {
  35     char uname[33] = "", tty[38] = "/dev/";
  36     foo(uname, tty);
  37 }
  38
  39 int main()
  40 {
  41   showinfo ();
  42   exit (0);
  43 }