| /* Copyright (C) 2008-2018 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/>. */ |
| |
| #ifndef LIBITM_X86_TLS_H |
| #define LIBITM_X86_TLS_H 1 |
| |
| #if defined(__GLIBC_PREREQ) |
| #if __GLIBC_PREREQ(2, 10) |
| /* Use slots in the TCB head rather than __thread lookups. |
| GLIBC has reserved words 10 through 13 for TM. */ |
| #define HAVE_ARCH_GTM_THREAD 1 |
| #define HAVE_ARCH_GTM_THREAD_DISP 1 |
| #endif |
| #endif |
| |
| #include "config/generic/tls.h" |
| |
| #if defined(__GLIBC_PREREQ) |
| #if __GLIBC_PREREQ(2, 10) |
| namespace GTM HIDDEN { |
| |
| #ifdef __x86_64__ |
| #ifdef __LP64__ |
| # define SEG_READ(OFS) "movq\t%%fs:(" #OFS "*8),%0" |
| # define SEG_WRITE(OFS) "movq\t%0,%%fs:(" #OFS "*8)" |
| # define SEG_DECODE_READ(OFS) SEG_READ(OFS) "\n\t" \ |
| "rorq\t$17,%0\n\t" \ |
| "xorq\t%%fs:48,%0" |
| # define SEG_ENCODE_WRITE(OFS) "xorq\t%%fs:48,%0\n\t" \ |
| "rolq\t$17,%0\n\t" \ |
| SEG_WRITE(OFS) |
| #else |
| // For X32. |
| # define SEG_READ(OFS) "movl\t%%fs:(" #OFS "*4),%0" |
| # define SEG_WRITE(OFS) "movl\t%0,%%fs:(" #OFS "*4)" |
| # define SEG_DECODE_READ(OFS) SEG_READ(OFS) "\n\t" \ |
| "rorl\t$9,%0\n\t" \ |
| "xorl\t%%fs:24,%0" |
| # define SEG_ENCODE_WRITE(OFS) "xorl\t%%fs:24,%0\n\t" \ |
| "roll\t$9,%0\n\t" \ |
| SEG_WRITE(OFS) |
| #endif |
| #else |
| # define SEG_READ(OFS) "movl\t%%gs:(" #OFS "*4),%0" |
| # define SEG_WRITE(OFS) "movl\t%0,%%gs:(" #OFS "*4)" |
| # define SEG_DECODE_READ(OFS) SEG_READ(OFS) "\n\t" \ |
| "rorl\t$9,%0\n\t" \ |
| "xorl\t%%gs:24,%0" |
| # define SEG_ENCODE_WRITE(OFS) "xorl\t%%gs:24,%0\n\t" \ |
| "roll\t$9,%0\n\t" \ |
| SEG_WRITE(OFS) |
| #endif |
| |
| static inline struct gtm_thread *gtm_thr(void) |
| { |
| struct gtm_thread *r; |
| asm volatile (SEG_READ(10) : "=r"(r)); |
| return r; |
| } |
| |
| static inline void set_gtm_thr(struct gtm_thread *x) |
| { |
| asm volatile (SEG_WRITE(10) : : "r"(x)); |
| } |
| |
| static inline struct abi_dispatch *abi_disp(void) |
| { |
| struct abi_dispatch *r; |
| asm volatile (SEG_DECODE_READ(11) : "=r"(r)); |
| return r; |
| } |
| |
| static inline void set_abi_disp(struct abi_dispatch *x) |
| { |
| void *scratch; |
| asm volatile (SEG_ENCODE_WRITE(11) : "=r"(scratch) : "0"(x)); |
| } |
| |
| #undef SEG_READ |
| #undef SEG_WRITE |
| #undef SEG_DECODE_READ |
| #undef SEG_ENCODE_WRITE |
| |
| } // namespace GTM |
| #endif /* >= GLIBC 2.10 */ |
| #endif |
| |
| #endif // LIBITM_X86_TLS_H |