memcheck/tests/s390x/cli.c

   1 #include <stdlib.h>
   2
   3 volatile unsigned long tmp;
   4 static const char      use_idx[] = "01234567890abcdefghijklmnopqrstuvwxyz";
   5
   6 static void depend_on(int val) { tmp = use_idx[val]; }
   7
   8 static void pretend_write(unsigned long* val) { __asm__("" : "=m"(*val) : :); }
   9
  10 static void do_compares(unsigned long value)
  11 {
  12    unsigned char val1 = value & 0xff;
  13    int result = 0;
  14
  15    __asm__("cli  %[val],0x20\n\t"
  16            "jl   1f\n\t"
  17            "lghi %[res],1\n\t"
  18            "1:   nopr 0"
  19            : [res] "+d"(result)
  20            : [val] "Q"(val1)
  21            :);
  22    depend_on(result);
  23
  24    __asm__("cli  %[val],0x40\n\t"
  25            "jnl  1f\n\t"
  26            "lghi %[res],2\n\t"
  27            "1:   nopr 0"
  28            : [res] "+d"(result)
  29            : [val] "Q"(val1)
  30            :);
  31    depend_on(result);
  32 }
  33
  34 int main()
  35 {
  36    unsigned long* buf = malloc(sizeof(unsigned long));
  37    pretend_write(buf);
  38    do_compares(*buf & 0x3f);
  39    free(buf);
  40    return 0;
  41 }