mirror of
https://github.com/autc04/Retro68.git
synced 2024-10-30 09:27:20 +00:00
68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
/* Copyright (C) 2011 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/>. */
|
|
|
|
/* This file initializes GTM_hwcap in some os-specific way to indicate
|
|
what ISA extensions are present for ARM. */
|
|
|
|
#include "libitm_i.h"
|
|
#include "hwcap.h"
|
|
|
|
/* Begin by defaulting to whatever options were given to the compiler. */
|
|
int GTM_hwcap HIDDEN = 0
|
|
#ifdef __VFP_FP__
|
|
| HWCAP_ARM_VFP
|
|
#endif
|
|
#ifdef __IWMMXT__
|
|
| HWCAP_ARM_IWMMXT
|
|
#endif
|
|
;
|
|
|
|
#ifdef __linux__
|
|
#include <unistd.h>
|
|
#include <sys/fcntl.h>
|
|
#include <elf.h>
|
|
|
|
static void __attribute__((constructor))
|
|
init_gtm_hwcap(void)
|
|
{
|
|
int fd = open ("/proc/self/auxv", O_RDONLY);
|
|
if (fd < 0)
|
|
return;
|
|
|
|
Elf32_auxv_t pairs[512];
|
|
ssize_t rlen = read (fd, pairs, sizeof(pairs));
|
|
close (fd);
|
|
if (rlen < 0)
|
|
return;
|
|
|
|
size_t n = (size_t)rlen / sizeof(pairs[0]);
|
|
for (size_t i = 0; i < n; ++i)
|
|
if (pairs[i].a_type == AT_HWCAP)
|
|
{
|
|
GTM_hwcap = pairs[i].a_un.a_val;
|
|
return;
|
|
}
|
|
}
|
|
#endif
|