gcc/testsuite/gcc.target/arm/handler-align.c

   1 /* Test epilogue of a realigned interrupt handler. */
   2 /* { dg-do run } */
   3 /* { dg-options "-mthumb -Os" } */
   4 /* { dg-skip-if "" { ! { arm_thumb1_ok || arm_thumb2_ok } } } */
   5 /* { dg-require-effective-target arm_cortex_m } */
   6 /* { dg-require-effective-target arm_eabi } */
   7
   8 extern __attribute__((noreturn)) void abort(void);
   9 extern int snprintf(char *, int, const char *, ...);
  10
  11 #define BUFF_LEN 256
  12 char buff[BUFF_LEN];
  13
  14 char *get_buffer(void)
  15 {
  16         return buff;
  17 }
  18
  19 void __attribute__((interrupt)) foo(void)
  20 {
  21         char *msg = get_buffer();
  22         snprintf(msg, BUFF_LEN, "%d %p", 1, buff+BUFF_LEN);
  23 }
  24
  25 volatile void * save_sp;
  26 int main()
  27 {
  28         register volatile void * sp asm("sp");
  29         /* Check stack pointer before/after calling the interrupt
  30          * handler. Not equal means that handler doesn't restore
  31          * stack correctly.  */
  32         save_sp = sp;
  33         foo();
  34         /* Abort here instead of return non-zero. Due to wrong sp, lr value,
  35          * returning from main may not work.  */
  36         if (save_sp != sp)
  37         {
  38                 sp = save_sp;
  39                 abort();
  40         }
  41         return 0;
  42 }