gcc/testsuite/gcc.target/rx/interrupts.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-mint-register=3" } */
   3
   4 /* Verify that the RX specific function attributes work.  */
   5
   6 void interrupt (void) __attribute__((__interrupt__));
   7 void exception (void) __attribute__((__exception__));
   8 int naked (int) __attribute__((__naked__));
   9
  10 int flag = 0;
  11
  12 /* Fast interrupt handler.  Only uses registers marked as fixed
  13    by the -fixed-xxx gcc command line option.  Returns via RTFI.  */
  14
  15 void
  16 interrupt (void)
  17 {
  18   flag = 1;
  19 }
  20
  21 /* Exception handler.  Must preserve any register it uses, even
  22    call clobbered ones.  Returns via RTE.  */
  23
  24 void
  25 exception (void)
  26 {
  27   switch (flag)
  28     {
  29     case 0:
  30       flag = -1;
  31       break;
  32     case 1:
  33     case 2:
  34     case 4:
  35       flag = flag - 2;
  36       break;
  37     case 5:
  38     case 7:
  39     case 6:
  40       flag ^= 3;
  41       break;
  42     default:
  43       naked (flag * 2);
  44       break;
  45     }
  46 }
  47
  48 /* Naked function.  The programmer must supply the function's
  49    prologue and epilogue instructions.  */
  50
  51 int
  52 naked (int arg)
  53 {
  54   flag = arg;
  55 }
  56
  57 /* { dg-final { scan-assembler "rtfi" } } */
  58 /* { dg-final { scan-assembler "rte" } } */