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/* This testcase is part of GDB, the GNU debugger.
Copyright 2017-2021 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <stdint.h>
#include <assert.h>
static int again;
static volatile struct
{
uint64_t alignment;
union
{
uint64_t size8[1];
uint32_t size4[2];
uint16_t size2[4];
uint8_t size1[8];
uint64_t size8twice[2];
}
u;
} data;
static int size = 0;
static int offset;
static void
write_size8twice (void)
{
static const uint64_t first = 1;
static const uint64_t second = 2;
#ifdef __aarch64__
asm volatile ("stp %1, %2, [%0]"
: /* output */
: "r" (data.u.size8twice), "r" (first), "r" (second) /* input */
: "memory" /* clobber */);
#else
data.u.size8twice[0] = first;
data.u.size8twice[1] = second;
#endif
}
int
main (void)
{
volatile uint64_t local;
assert (sizeof (data) == 8 + 2 * 8);
write_size8twice ();
while (size)
{
switch (size)
{
/* __s390x__ also defines __s390__ */
#ifdef __s390__
# define ACCESS(var) var = ~var
#else
# define ACCESS(var) local = var
#endif
case 8:
ACCESS (data.u.size8[offset]);
break;
case 4:
ACCESS (data.u.size4[offset]);
break;
case 2:
ACCESS (data.u.size2[offset]);
break;
case 1:
ACCESS (data.u.size1[offset]);
break;
#undef ACCESS
default:
assert (0);
}
size = 0;
size = size; /* start_again */
}
return 0; /* final_return */
}
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