128 lines
3.1 KiB
C++
128 lines
3.1 KiB
C++
/* Copyright (C) 2013-2015 Free Software Foundation, Inc.
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Contributed by Andreas Krebbel <krebbel@linux.vnet.ibm.com>.
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This file is part of the GNU Transactional Memory Library (libitm).
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Libitm is free software; you can redistribute it and/or modify it
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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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Libitm 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 FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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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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#ifdef HAVE_SYS_AUXV_H
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#include <sys/auxv.h>
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#endif
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namespace GTM HIDDEN {
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#define HW_CACHELINE_SIZE 256
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typedef struct gtm_jmpbuf
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{
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/* We save registers r6-r14. */
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long int __gregs[9];
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/* r15 is stored into cfa field. It needs to be named that way
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since tls.h is accessing the field by name. Be aware that this
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is not actually what we consider the CFA on s390 (since there is
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a fix offset between sp and CFA). It is merely the saved stack
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pointer. */
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void *cfa;
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#ifdef __s390x__
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/* We save fpu registers f8 - f15. */
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long __fpregs[8];
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#else
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/* We save fpu registers f4 and f6. */
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long __fpregs[4];
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#endif
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} gtm_jmpbuf;
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static inline void
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cpu_relax (void)
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{
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__asm volatile ("" : : : "memory");
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}
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// Use HTM if it is supported by the system.
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// See gtm_thread::begin_transaction for how these functions are used.
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#if defined (__linux__) \
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&& defined (HAVE_AS_HTM) \
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&& defined (HAVE_GETAUXVAL) \
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&& defined (HWCAP_S390_TE)
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#include <htmintrin.h>
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/* Number of retries for transient failures. */
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#define _HTM_ITM_RETRIES 10
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#define USE_HTM_FASTPATH
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static inline bool
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htm_available ()
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{
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return (getauxval (AT_HWCAP) & HWCAP_S390_TE) ? true : false;
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}
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static inline uint32_t
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htm_init ()
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{
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return htm_available () ? _HTM_ITM_RETRIES : 0;
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}
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static inline uint32_t
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htm_begin ()
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{
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__asm volatile (".machine \"all\" \n\t");
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return __builtin_tbegin_nofloat (NULL);
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}
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static inline bool
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htm_begin_success (uint32_t begin_ret)
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{
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return begin_ret == _HTM_TBEGIN_STARTED;
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}
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static inline void
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htm_commit ()
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{
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__asm volatile (".machine \"all\" \n\t");
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__builtin_tend ();
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}
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static inline void
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htm_abort ()
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{
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__asm volatile (".machine \"all\" \n\t");
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__builtin_tabort (_HTM_FIRST_USER_ABORT_CODE);
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}
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static inline bool
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htm_abort_should_retry (uint32_t begin_ret)
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{
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return begin_ret == _HTM_TBEGIN_TRANSIENT;
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}
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static inline bool
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htm_transaction_active ()
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{
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__asm volatile (".machine \"all\" \n\t");
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return __builtin_tx_nesting_depth() != 0;
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}
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#endif
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} // namespace GTM
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