97 lines
2.0 KiB
C
97 lines
2.0 KiB
C
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/* This testcase is part of GDB, the GNU debugger.
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Copyright 2017-2018 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <stdint.h>
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#include <assert.h>
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static int again;
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static volatile struct
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{
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uint64_t alignment;
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union
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{
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uint64_t size8[1];
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uint32_t size4[2];
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uint16_t size2[4];
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uint8_t size1[8];
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uint64_t size8twice[2];
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}
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u;
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} data;
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static int size = 0;
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static int offset;
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static void
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write_size8twice (void)
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{
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static const uint64_t first = 1;
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static const uint64_t second = 2;
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#ifdef __aarch64__
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asm volatile ("stp %1, %2, [%0]"
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: /* output */
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: "r" (data.u.size8twice), "r" (first), "r" (second) /* input */
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: "memory" /* clobber */);
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#else
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data.u.size8twice[0] = first;
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data.u.size8twice[1] = second;
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#endif
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}
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int
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main (void)
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{
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volatile uint64_t local;
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assert (sizeof (data) == 8 + 2 * 8);
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write_size8twice ();
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while (size)
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{
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switch (size)
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{
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/* __s390x__ also defines __s390__ */
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#ifdef __s390__
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# define ACCESS(var) var = ~var
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#else
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# define ACCESS(var) local = var
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#endif
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case 8:
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ACCESS (data.u.size8[offset]);
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break;
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case 4:
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ACCESS (data.u.size4[offset]);
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break;
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case 2:
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ACCESS (data.u.size2[offset]);
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break;
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case 1:
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ACCESS (data.u.size1[offset]);
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break;
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#undef ACCESS
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default:
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assert (0);
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}
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size = 0;
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size = size; /* start_again */
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}
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return 0; /* final_return */
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}
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