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/* Copyright (C) 2012-2019 Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@redhat.com>.
This file is part of the GNU Transactional Memory Library (libitm).
Libitm 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 of the License, or
(at your option) any later version.
Libitm 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/>. */
#ifdef HAVE_SYS_AUXV_H
#include <sys/auxv.h>
#endif
namespace GTM HIDDEN {
typedef int v128 __attribute__((vector_size(16), may_alias, aligned(16)));
typedef struct gtm_jmpbuf
{
#if defined(__ALTIVEC__) || defined(__VSX__)
v128 vr[12]; /* vr20-vr31 */
unsigned long long vscr; /* long long for padding only */
#endif
#ifndef _SOFT_FLOAT
double fr[18]; /* f14-f31 */
double fpscr;
#endif
unsigned long gr[18]; /* r14-r31 */
void *cfa;
unsigned long pc;
unsigned long toc; /* r2 on aix, r13 on darwin */
unsigned long cr;
} gtm_jmpbuf;
/* The size of one line in hardware caches (in bytes). */
#if defined (__powerpc64__) || defined (__ppc64__)
# define HW_CACHELINE_SIZE 128
#else
# define HW_CACHELINE_SIZE 32
#endif
static inline void
cpu_relax (void)
{
__asm volatile ("" : : : "memory");
}
// Use HTM if it is supported by the system.
// See gtm_thread::begin_transaction for how these functions are used.
#if defined (__linux__) \
&& defined (HAVE_AS_HTM) \
&& defined (HAVE_GETAUXVAL) \
&& defined (AT_HWCAP2) \
&& defined (PPC_FEATURE2_HAS_HTM)
#include <htmintrin.h>
#define USE_HTM_FASTPATH
#define _TBEGIN_STARTED 0
#define _TBEGIN_INDETERMINATE 1
#define _TBEGIN_PERSISTENT 2
/* Number of retries for transient failures. */
#define _HTM_RETRIES 10
static inline bool
htm_available (void)
{
#ifdef __BUILTIN_CPU_SUPPORTS__
if (__builtin_cpu_supports ("htm-no-suspend")
|| __builtin_cpu_supports ("htm"))
return true;
#else
unsigned long htm_flags = PPC_FEATURE2_HAS_HTM
#ifdef PPC_FEATURE2_HTM_NO_SUSPEND
| PPC_FEATURE2_HTM_NO_SUSPEND
#endif
| 0;
if (getauxval (AT_HWCAP2) & htm_flags)
return true;
#endif
return false;
}
static inline uint32_t
htm_init (void)
{
// Maximum number of times we try to execute a transaction
// as a HW transaction.
return htm_available () ? _HTM_RETRIES : 0;
}
static inline uint32_t
htm_begin (void)
{
if (__builtin_expect (__builtin_tbegin (0), 1))
return _TBEGIN_STARTED;
if (_TEXASRU_FAILURE_PERSISTENT (__builtin_get_texasru ()))
return _TBEGIN_PERSISTENT;
return _TBEGIN_INDETERMINATE;
}
static inline bool
htm_begin_success (uint32_t begin_ret)
{
return begin_ret == _TBEGIN_STARTED;
}
static inline void
htm_commit (void)
{
__builtin_tend (0);
}
static inline void
htm_abort (void)
{
__builtin_tabort (0);
}
static inline bool
htm_abort_should_retry (uint32_t begin_ret)
{
return begin_ret != _TBEGIN_PERSISTENT;
}
/* Returns true iff a hardware transaction is currently being executed. */
static inline bool
htm_transaction_active (void)
{
return (_HTM_STATE (__builtin_ttest ()) == _HTM_TRANSACTIONAL);
}
#endif
} // namespace GTM
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