110 lines
3.2 KiB
C++
110 lines
3.2 KiB
C++
/* Copyright (C) 2008-2021 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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#ifndef LIBITM_X86_TLS_H
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#define LIBITM_X86_TLS_H 1
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#if defined(__GLIBC_PREREQ)
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#if __GLIBC_PREREQ(2, 10)
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/* Use slots in the TCB head rather than __thread lookups.
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GLIBC has reserved words 10 through 13 for TM. */
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#define HAVE_ARCH_GTM_THREAD 1
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#define HAVE_ARCH_GTM_THREAD_DISP 1
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#endif
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#endif
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#include "config/generic/tls.h"
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#if defined(__GLIBC_PREREQ)
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#if __GLIBC_PREREQ(2, 10)
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namespace GTM HIDDEN {
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#ifdef __x86_64__
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#ifdef __LP64__
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# define SEG_READ(OFS) "movq\t%%fs:(80+" #OFS "*8),%0"
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# define SEG_WRITE(OFS) "movq\t%0,%%fs:(80+" #OFS "*8)"
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# define SEG_DECODE_READ(OFS) SEG_READ(OFS) "\n\t" \
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"rorq\t$17,%0\n\t" \
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"xorq\t%%fs:48,%0"
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# define SEG_ENCODE_WRITE(OFS) "xorq\t%%fs:48,%0\n\t" \
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"rolq\t$17,%0\n\t" \
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SEG_WRITE(OFS)
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#else
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// For X32.
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# define SEG_READ(OFS) "movl\t%%fs:(48+" #OFS "*4),%0"
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# define SEG_WRITE(OFS) "movl\t%0,%%fs:(48+" #OFS "*4)"
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# define SEG_DECODE_READ(OFS) SEG_READ(OFS) "\n\t" \
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"rorl\t$9,%0\n\t" \
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"xorl\t%%fs:28,%0"
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# define SEG_ENCODE_WRITE(OFS) "xorl\t%%fs:28,%0\n\t" \
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"roll\t$9,%0\n\t" \
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SEG_WRITE(OFS)
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#endif
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#else
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# define SEG_READ(OFS) "movl\t%%gs:(36+" #OFS "*4),%0"
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# define SEG_WRITE(OFS) "movl\t%0,%%gs:(36+" #OFS "*4)"
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# define SEG_DECODE_READ(OFS) SEG_READ(OFS) "\n\t" \
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"rorl\t$9,%0\n\t" \
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"xorl\t%%gs:24,%0"
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# define SEG_ENCODE_WRITE(OFS) "xorl\t%%gs:24,%0\n\t" \
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"roll\t$9,%0\n\t" \
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SEG_WRITE(OFS)
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#endif
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static inline struct gtm_thread *gtm_thr(void)
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{
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struct gtm_thread *r;
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asm volatile (SEG_READ(0) : "=r"(r));
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return r;
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}
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static inline void set_gtm_thr(struct gtm_thread *x)
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{
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asm volatile (SEG_WRITE(0) : : "r"(x));
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}
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static inline struct abi_dispatch *abi_disp(void)
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{
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struct abi_dispatch *r;
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asm volatile (SEG_DECODE_READ(1) : "=r"(r));
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return r;
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}
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static inline void set_abi_disp(struct abi_dispatch *x)
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{
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void *scratch;
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asm volatile (SEG_ENCODE_WRITE(1) : "=r"(scratch) : "0"(x));
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}
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#undef SEG_READ
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#undef SEG_WRITE
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#undef SEG_DECODE_READ
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#undef SEG_ENCODE_WRITE
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} // namespace GTM
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#endif /* >= GLIBC 2.10 */
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#endif
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#endif // LIBITM_X86_TLS_H
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