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Diffstat (limited to 'gcc/config/sync.c')
| -rw-r--r-- | gcc/config/sync.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/gcc/config/sync.c b/gcc/config/sync.c new file mode 100644 index 00000000000..ec60ef0a1a4 --- /dev/null +++ b/gcc/config/sync.c @@ -0,0 +1,185 @@ +/* Out-of-line libgcc versions of __sync_* builtins. */ +/* Copyright (C) 2008 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC 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 2, or (at your option) any later +version. + +In addition to the permissions in the GNU General Public License, the +Free Software Foundation gives you unlimited permission to link the +compiled version of this file into combinations with other programs, +and to distribute those combinations without any restriction coming +from the use of this file. (The General Public License restrictions +do apply in other respects; for example, they cover modification of +the file, and distribution when not linked into a combine +executable.) + +GCC 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 GCC; see the file COPYING. If not, write to the Free +Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301, USA. */ + +/* This file is used by targets whose makefiles define LIBGCC_SYNC + to "yes". It is compiled with LIBGCC_SYNC_CFLAGS and provides + out-of-line versions of all relevant __sync_* primitives. + + These routines are intended for targets like MIPS that have two + ISA encodings (the "normal" ISA and the MIPS16 ISA). The normal + ISA provides full synchronization capabilities but the MIPS16 ISA + has no encoding for them. MIPS16 code must therefore call external + non-MIPS16 implementations of the __sync_* routines. + + The file is compiled once for each routine. The following __foo + routines are selected by defining a macro called L<foo>: + + __sync_synchronize + + The following __foo_N routines are selected by defining FN=foo + and SIZE=N: + + __sync_fetch_and_add_N + __sync_fetch_and_sub_N + __sync_fetch_and_or_N + __sync_fetch_and_and_N + __sync_fetch_and_xor_N + __sync_fetch_and_nand_N + __sync_add_and_fetch_N + __sync_sub_and_fetch_N + __sync_or_and_fetch_N + __sync_and_and_fetch_N + __sync_xor_and_fetch_N + __sync_nand_and_fetch_N + __sync_bool_compare_and_swap_N + __sync_val_compare_and_swap_N + __sync_lock_test_and_set_N + + SIZE can be 1, 2, 4, 8 or 16. __foo_N is omitted if the target does + not provide __sync_compare_and_swap_N. + + Note that __sync_lock_release does not fall back on external + __sync_lock_release_N functions. The default implementation + of __sync_lock_release is a call to __sync_synchronize followed + by a store of zero, so we don't need separate library functions + for it. */ + +#if defined FN + +/* Define macros for each __sync_* function type. Each macro defines a + local function called <NAME>_<UNITS> that acts like __<NAME>_<UNITS>. + TYPE is a type that has UNITS bytes. */ + +#define DEFINE_V_PV(NAME, UNITS, TYPE) \ + static TYPE \ + NAME##_##UNITS (TYPE *ptr, TYPE value) \ + { \ + return __##NAME (ptr, value); \ + } + +#define DEFINE_V_PVV(NAME, UNITS, TYPE) \ + static TYPE \ + NAME##_##UNITS (TYPE *ptr, TYPE value1, TYPE value2) \ + { \ + return __##NAME (ptr, value1, value2); \ + } + +#define DEFINE_BOOL_PVV(NAME, UNITS, TYPE) \ + static _Bool \ + NAME##_##UNITS (TYPE *ptr, TYPE value1, TYPE value2) \ + { \ + return __##NAME (ptr, value1, value2); \ + } + +/* Map function names to the appropriate DEFINE_* macro. */ + +#define local_sync_fetch_and_add DEFINE_V_PV +#define local_sync_fetch_and_sub DEFINE_V_PV +#define local_sync_fetch_and_or DEFINE_V_PV +#define local_sync_fetch_and_and DEFINE_V_PV +#define local_sync_fetch_and_xor DEFINE_V_PV +#define local_sync_fetch_and_nand DEFINE_V_PV + +#define local_sync_add_and_fetch DEFINE_V_PV +#define local_sync_sub_and_fetch DEFINE_V_PV +#define local_sync_or_and_fetch DEFINE_V_PV +#define local_sync_and_and_fetch DEFINE_V_PV +#define local_sync_xor_and_fetch DEFINE_V_PV +#define local_sync_nand_and_fetch DEFINE_V_PV + +#define local_sync_bool_compare_and_swap DEFINE_BOOL_PVV +#define local_sync_val_compare_and_swap DEFINE_V_PVV + +#define local_sync_lock_test_and_set DEFINE_V_PV + +/* Define the function __<NAME>_<UNITS>, given that TYPE is a type with + UNITS bytes. */ +#define DEFINE1(NAME, UNITS, TYPE) \ + static int unused[sizeof (TYPE) == UNITS ? 1 : -1] \ + __attribute__((unused)); \ + local_##NAME (NAME, UNITS, TYPE); \ + typeof (NAME##_##UNITS) __##NAME##_##UNITS \ + __attribute__((alias (#NAME "_" #UNITS))); + +/* As above, but performing macro expansion on the arguments. */ +#define DEFINE(NAME, UNITS, TYPE) DEFINE1 (NAME, UNITS, TYPE) + +/* Find an appropriate type TYPE for SIZE and invoke DEFINE (FN, SIZE, TYPE). + + The types chosen here may be incorrect for some targets. + For example, targets with 16-byte atomicity support might not + support OImode. We would need some kind of target-specific + override if that becomes a problem. */ + +#if SIZE == 1 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 + +typedef unsigned int UQItype __attribute__((mode (QI))); +DEFINE (FN, 1, UQItype) + +#elif SIZE == 2 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 + +typedef unsigned int UHItype __attribute__((mode (HI))); +DEFINE (FN, 2, UHItype) + +#elif SIZE == 4 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 + +typedef unsigned int USItype __attribute__((mode (SI))); +DEFINE (FN, 4, USItype) + +#elif SIZE == 8 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 + +typedef unsigned int UDItype __attribute__((mode (DI))); +DEFINE (FN, 8, UDItype) + +#elif SIZE == 16 && __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 + +typedef unsigned int UOItype __attribute__((mode (OI))); +DEFINE (FN, 8, UOItype) + +#endif + +#elif __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 \ + || __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 \ + || __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 \ + || __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 \ + || __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 + +#if defined Lsync_synchronize + +static void +sync_synchronize (void) +{ + __sync_synchronize (); +} +typeof (sync_synchronize) __sync_synchronize \ + __attribute__((alias ("sync_synchronize"))); + +#endif + +#endif |