/usr/include/atomic_ops/sysdeps/gcc/m68k.h is in libatomic-ops-dev 7.4-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | /*
* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
* Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
* Copyright (c) 1999-2003 by Hewlett-Packard Company. All rights reserved.
*
*
* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
*
* Permission is hereby granted to use or copy this program
* for any purpose, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is granted,
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
*
*/
/* The cas instruction causes an emulation trap for the */
/* 060 with a misaligned pointer, so let's avoid this. */
#undef AO_t
typedef unsigned long AO_t __attribute__ ((aligned (4)));
/* FIXME. Very incomplete. */
#include "../all_aligned_atomic_load_store.h"
/* Are there any m68k multiprocessors still around? */
/* AFAIK, Alliants were sequentially consistent. */
#include "../ordered.h"
#include "../test_and_set_t_is_char.h"
AO_INLINE AO_TS_VAL_t
AO_test_and_set_full(volatile AO_TS_t *addr) {
AO_TS_t oldval;
/* The value at addr is semi-phony. */
/* 'tas' sets bit 7 while the return */
/* value pretends all bits were set, */
/* which at least matches AO_TS_SET. */
__asm__ __volatile__(
"tas %1; sne %0"
: "=d" (oldval), "=m" (*addr)
: "m" (*addr)
: "memory");
/* This cast works due to the above. */
return (AO_TS_VAL_t)oldval;
}
#define AO_HAVE_test_and_set_full
/* Returns nonzero if the comparison succeeded. */
AO_INLINE int
AO_compare_and_swap_full(volatile AO_t *addr,
AO_t old, AO_t new_val)
{
char result;
__asm__ __volatile__(
"cas.l %3,%4,%1; seq %0"
: "=d" (result), "=m" (*addr)
: "m" (*addr), "d" (old), "d" (new_val)
: "memory");
return -result;
}
#define AO_HAVE_compare_and_swap_full
/* TODO: implement AO_fetch_compare_and_swap. */
#define AO_T_IS_INT
|