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181 lines
5.9 KiB
C
181 lines
5.9 KiB
C
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/* Out-of-line libgcc versions of __sync_* builtins. */
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/* Copyright (C) 2008, 2009, 2011 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* This file is used by targets whose makefiles define SYNC
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to "yes". It is compiled with SYNC_CFLAGS and provides
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out-of-line versions of all relevant __sync_* primitives.
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These routines are intended for targets like MIPS that have two
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ISA encodings (the "normal" ISA and the MIPS16 ISA). The normal
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ISA provides full synchronization capabilities but the MIPS16 ISA
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has no encoding for them. MIPS16 code must therefore call external
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non-MIPS16 implementations of the __sync_* routines.
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The file is compiled once for each routine. The following __foo
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routines are selected by defining a macro called L<foo>:
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__sync_synchronize
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The following __foo_N routines are selected by defining FN=foo
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and SIZE=N:
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__sync_fetch_and_add_N
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__sync_fetch_and_sub_N
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__sync_fetch_and_or_N
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__sync_fetch_and_and_N
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__sync_fetch_and_xor_N
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__sync_fetch_and_nand_N
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__sync_add_and_fetch_N
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__sync_sub_and_fetch_N
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__sync_or_and_fetch_N
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__sync_and_and_fetch_N
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__sync_xor_and_fetch_N
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__sync_nand_and_fetch_N
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__sync_bool_compare_and_swap_N
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__sync_val_compare_and_swap_N
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__sync_lock_test_and_set_N
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SIZE can be 1, 2, 4, 8 or 16. __foo_N is omitted if the target does
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not provide __sync_compare_and_swap_N.
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Note that __sync_lock_release does not fall back on external
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__sync_lock_release_N functions. The default implementation
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of __sync_lock_release is a call to __sync_synchronize followed
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by a store of zero, so we don't need separate library functions
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for it. */
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#if defined FN
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/* Define macros for each __sync_* function type. Each macro defines a
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local function called <NAME>_<UNITS> that acts like __<NAME>_<UNITS>.
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TYPE is a type that has UNITS bytes. */
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#define DEFINE_V_PV(NAME, UNITS, TYPE) \
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static TYPE \
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NAME##_##UNITS (TYPE *ptr, TYPE value) \
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{ \
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return __##NAME (ptr, value); \
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}
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#define DEFINE_V_PVV(NAME, UNITS, TYPE) \
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static TYPE \
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NAME##_##UNITS (TYPE *ptr, TYPE value1, TYPE value2) \
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{ \
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return __##NAME (ptr, value1, value2); \
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}
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#define DEFINE_BOOL_PVV(NAME, UNITS, TYPE) \
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static _Bool \
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NAME##_##UNITS (TYPE *ptr, TYPE value1, TYPE value2) \
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{ \
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return __##NAME (ptr, value1, value2); \
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}
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/* Map function names to the appropriate DEFINE_* macro. */
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#define local_sync_fetch_and_add DEFINE_V_PV
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#define local_sync_fetch_and_sub DEFINE_V_PV
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#define local_sync_fetch_and_or DEFINE_V_PV
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#define local_sync_fetch_and_and DEFINE_V_PV
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#define local_sync_fetch_and_xor DEFINE_V_PV
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#define local_sync_fetch_and_nand DEFINE_V_PV
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#define local_sync_add_and_fetch DEFINE_V_PV
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#define local_sync_sub_and_fetch DEFINE_V_PV
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#define local_sync_or_and_fetch DEFINE_V_PV
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#define local_sync_and_and_fetch DEFINE_V_PV
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#define local_sync_xor_and_fetch DEFINE_V_PV
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#define local_sync_nand_and_fetch DEFINE_V_PV
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#define local_sync_bool_compare_and_swap DEFINE_BOOL_PVV
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#define local_sync_val_compare_and_swap DEFINE_V_PVV
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#define local_sync_lock_test_and_set DEFINE_V_PV
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/* Define the function __<NAME>_<UNITS>, given that TYPE is a type with
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UNITS bytes. */
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#define DEFINE1(NAME, UNITS, TYPE) \
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static int unused[sizeof (TYPE) == UNITS ? 1 : -1] \
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__attribute__((unused)); \
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local_##NAME (NAME, UNITS, TYPE); \
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typeof (NAME##_##UNITS) __##NAME##_##UNITS \
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__attribute__((alias (#NAME "_" #UNITS)));
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/* As above, but performing macro expansion on the arguments. */
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#define DEFINE(NAME, UNITS, TYPE) DEFINE1 (NAME, UNITS, TYPE)
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/* Find an appropriate type TYPE for SIZE and invoke DEFINE (FN, SIZE, TYPE).
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The types chosen here may be incorrect for some targets.
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For example, targets with 16-byte atomicity support might not
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support OImode. We would need some kind of target-specific
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override if that becomes a problem. */
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#if SIZE == 1 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1
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typedef unsigned int UQItype __attribute__((mode (QI)));
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DEFINE (FN, 1, UQItype)
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#elif SIZE == 2 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2
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typedef unsigned int UHItype __attribute__((mode (HI)));
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DEFINE (FN, 2, UHItype)
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#elif SIZE == 4 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
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typedef unsigned int USItype __attribute__((mode (SI)));
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DEFINE (FN, 4, USItype)
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#elif SIZE == 8 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
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typedef unsigned int UDItype __attribute__((mode (DI)));
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DEFINE (FN, 8, UDItype)
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#elif SIZE == 16 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
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typedef unsigned int UOItype __attribute__((mode (OI)));
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DEFINE (FN, 8, UOItype)
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#endif
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#elif __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 \
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|| __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 \
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|| __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 \
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|| __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 \
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|| __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16
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#if defined Lsync_synchronize
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static void
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sync_synchronize (void)
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{
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__sync_synchronize ();
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}
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typeof (sync_synchronize) __sync_synchronize \
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__attribute__((alias ("sync_synchronize")));
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#endif
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#endif
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