68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
/* Copyright (C) 2011-2013 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@redhat.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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/* This file initializes GTM_hwcap in some os-specific way to indicate
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what ISA extensions are present for ARM. */
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#include "libitm_i.h"
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#include "hwcap.h"
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/* Begin by defaulting to whatever options were given to the compiler. */
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int GTM_hwcap HIDDEN = 0
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#ifdef __VFP_FP__
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| HWCAP_ARM_VFP
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#endif
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#ifdef __IWMMXT__
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| HWCAP_ARM_IWMMXT
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#endif
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;
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#ifdef __linux__
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#include <unistd.h>
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#include <sys/fcntl.h>
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#include <elf.h>
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static void __attribute__((constructor))
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init_gtm_hwcap(void)
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{
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int fd = open ("/proc/self/auxv", O_RDONLY);
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if (fd < 0)
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return;
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Elf32_auxv_t pairs[512];
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ssize_t rlen = read (fd, pairs, sizeof(pairs));
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close (fd);
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if (rlen < 0)
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return;
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size_t n = (size_t)rlen / sizeof(pairs[0]);
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for (size_t i = 0; i < n; ++i)
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if (pairs[i].a_type == AT_HWCAP)
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{
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GTM_hwcap = pairs[i].a_un.a_val;
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return;
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}
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}
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#endif
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