none/tests/s390x/op_exception.c

   1 /* zArchitecture specifies that operation exception(illegal opcode) is
   2 suppressing. That means that the program check old psw will point to
   3 the instruction after the illegal one (according to the calculated length).
   4 There are some programs out there that use this mechanism to detect available
   5 instruction (sigh).
   6 This patch checks, that valgrind makes forard progress. */
   7 #include <signal.h>
   8 #include <stdio.h>
   9 #include <string.h>
  10 static volatile int got_ill;
  11 static void handle_ill(int sig)
  12 {
  13         got_ill = 1;
  14 }
  15 int main()
  16 {
  17         struct sigaction sa;
  18
  19         memset(&sa, 0, sizeof(sa));
  20         sa.sa_handler = handle_ill;
  21         sigaction(SIGILL, &sa, NULL);
  22
  23         got_ill = 0;
  24         /* most architectures loop here, but on s390 this would increase the
  25            PSW by 2 and then by 2 */
  26         asm volatile(".insn e,0x0000\n\t.insn e,0x0000");
  27         if (got_ill)
  28                 printf("0x00000000 does not loop\n");
  29
  30         got_ill = 0;
  31         /* most architectures loop here, but on s390 this would increase the
  32            PSW by 6 and then by 2*/
  33         asm volatile(".insn ril,0xffffffffffff,0xf,.-2\n\t.insn e,0x0000");
  34         if (got_ill)
  35                 printf("0xffffffff does not loop\n");
  36         return 0;
  37 }
  38