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Diffstat (limited to 'gcc/config/arm/linux-atomic-64bit.c')
| -rw-r--r-- | gcc/config/arm/linux-atomic-64bit.c | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/gcc/config/arm/linux-atomic-64bit.c b/gcc/config/arm/linux-atomic-64bit.c deleted file mode 100644 index af94c7f..0000000 --- a/gcc/config/arm/linux-atomic-64bit.c +++ /dev/null @@ -1,166 +0,0 @@ -/* 64bit Linux-specific atomic operations for ARM EABI. - Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc. - Based on linux-atomic.c - - 64 bit additions david.gilbert@linaro.org - -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 3, or (at your option) any later -version. - -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. - -Under Section 7 of GPL version 3, you are granted additional -permissions described in the GCC Runtime Library Exception, version -3.1, as published by the Free Software Foundation. - -You should have received a copy of the GNU General Public License and -a copy of the GCC Runtime Library Exception along with this program; -see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -<http://www.gnu.org/licenses/>. */ - -/* 64bit helper functions for atomic operations; the compiler will - call these when the code is compiled for a CPU without ldrexd/strexd. - (If the CPU had those then the compiler inlines the operation). - - These helpers require a kernel helper that's only present on newer - kernels; we check for that in an init section and bail out rather - unceremoneously. */ - -extern unsigned int __write (int fd, const void *buf, unsigned int count); -extern void abort (void); - -/* Kernel helper for compare-and-exchange. */ -typedef int (__kernel_cmpxchg64_t) (const long long* oldval, - const long long* newval, - long long *ptr); -#define __kernel_cmpxchg64 (*(__kernel_cmpxchg64_t *) 0xffff0f60) - -/* Kernel helper page version number. */ -#define __kernel_helper_version (*(unsigned int *)0xffff0ffc) - -/* Check that the kernel has a new enough version at load. */ -static void __check_for_sync8_kernelhelper (void) -{ - if (__kernel_helper_version < 5) - { - const char err[] = "A newer kernel is required to run this binary. " - "(__kernel_cmpxchg64 helper)\n"; - /* At this point we need a way to crash with some information - for the user - I'm not sure I can rely on much else being - available at this point, so do the same as generic-morestack.c - write () and abort (). */ - __write (2 /* stderr. */, err, sizeof (err)); - abort (); - } -}; - -static void (*__sync8_kernelhelper_inithook[]) (void) - __attribute__ ((used, section (".init_array"))) = { - &__check_for_sync8_kernelhelper -}; - -#define HIDDEN __attribute__ ((visibility ("hidden"))) - -#define FETCH_AND_OP_WORD64(OP, PFX_OP, INF_OP) \ - long long HIDDEN \ - __sync_fetch_and_##OP##_8 (long long *ptr, long long val) \ - { \ - int failure; \ - long long tmp,tmp2; \ - \ - do { \ - tmp = *ptr; \ - tmp2 = PFX_OP (tmp INF_OP val); \ - failure = __kernel_cmpxchg64 (&tmp, &tmp2, ptr); \ - } while (failure != 0); \ - \ - return tmp; \ - } - -FETCH_AND_OP_WORD64 (add, , +) -FETCH_AND_OP_WORD64 (sub, , -) -FETCH_AND_OP_WORD64 (or, , |) -FETCH_AND_OP_WORD64 (and, , &) -FETCH_AND_OP_WORD64 (xor, , ^) -FETCH_AND_OP_WORD64 (nand, ~, &) - -#define NAME_oldval(OP, WIDTH) __sync_fetch_and_##OP##_##WIDTH -#define NAME_newval(OP, WIDTH) __sync_##OP##_and_fetch_##WIDTH - -/* Implement both __sync_<op>_and_fetch and __sync_fetch_and_<op> for - subword-sized quantities. */ - -#define OP_AND_FETCH_WORD64(OP, PFX_OP, INF_OP) \ - long long HIDDEN \ - __sync_##OP##_and_fetch_8 (long long *ptr, long long val) \ - { \ - int failure; \ - long long tmp,tmp2; \ - \ - do { \ - tmp = *ptr; \ - tmp2 = PFX_OP (tmp INF_OP val); \ - failure = __kernel_cmpxchg64 (&tmp, &tmp2, ptr); \ - } while (failure != 0); \ - \ - return tmp2; \ - } - -OP_AND_FETCH_WORD64 (add, , +) -OP_AND_FETCH_WORD64 (sub, , -) -OP_AND_FETCH_WORD64 (or, , |) -OP_AND_FETCH_WORD64 (and, , &) -OP_AND_FETCH_WORD64 (xor, , ^) -OP_AND_FETCH_WORD64 (nand, ~, &) - -long long HIDDEN -__sync_val_compare_and_swap_8 (long long *ptr, long long oldval, - long long newval) -{ - int failure; - long long actual_oldval; - - while (1) - { - actual_oldval = *ptr; - - if (__builtin_expect (oldval != actual_oldval, 0)) - return actual_oldval; - - failure = __kernel_cmpxchg64 (&actual_oldval, &newval, ptr); - - if (__builtin_expect (!failure, 1)) - return oldval; - } -} - -typedef unsigned char bool; - -bool HIDDEN -__sync_bool_compare_and_swap_8 (long long *ptr, long long oldval, - long long newval) -{ - int failure = __kernel_cmpxchg64 (&oldval, &newval, ptr); - return (failure == 0); -} - -long long HIDDEN -__sync_lock_test_and_set_8 (long long *ptr, long long val) -{ - int failure; - long long oldval; - - do { - oldval = *ptr; - failure = __kernel_cmpxchg64 (&oldval, &val, ptr); - } while (failure != 0); - - return oldval; -} |