nptl/sysdeps/x86_64/x32/tls.h

   1 /* Definition for thread-local data handling.  nptl/x32 version.
   2    Copyright (C) 2012-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _X32_TLS_H
  20 #define _X32_TLS_H      1
  21
  22 #include <sysdeps/x86_64/tls.h>
  23
  24 #ifndef __ASSEMBLER__
  25
  26 /* X32 doesn't support 32-bit indirect calls via memory.  Instead, we
  27    load the 32-bit address from memory into the lower 32 bits of the
  28    return-value register, which will automatically zero-extend the upper
  29    32 bits of the return-value register.  We then do the indirect call
  30    via the 64-bit return-value register.  */
  31 # undef CALL_THREAD_FCT
  32 # define CALL_THREAD_FCT(descr) \
  33   ({ void *__res;                                                             \
  34      asm volatile ("movl %%fs:%P2, %%edi\n\t"                                 \
  35                    "movl %%fs:%P1, %k0\n\t"                                   \
  36                    "callq *%q0"                                               \
  37                    : "=a" (__res)                                             \
  38                    : "i" (offsetof (struct pthread, start_routine)),          \
  39                      "i" (offsetof (struct pthread, arg))                     \
  40                    : "di", "si", "cx", "dx", "r8", "r9", "r10", "r11",        \
  41                      "memory", "cc");                                         \
  42      __res; })
  43
  44 #endif /* __ASSEMBLER__ */
  45
  46 #endif  /* x32/tls.h */