nptl/sysdeps/x86_64/pthreaddef.h

   1 /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /* Default stack size.  */
  21 #define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024)
  22
  23 /* Required stack pointer alignment at beginning.  SSE requires 16
  24    bytes.  */
  25 #define STACK_ALIGN             16
  26
  27 /* Minimal stack size after allocating thread descriptor and guard size.  */
  28 #define MINIMAL_REST_STACK      2048
  29
  30 /* Alignment requirement for TCB.  */
  31 #define TCB_ALIGNMENT           16
  32
  33
  34 /* Location of current stack frame.  The frame pointer is not usable.  */
  35 #define CURRENT_STACK_FRAME \
  36   ({ char *frame; asm ("movq %%rsp, %0" : "=r" (frame)); frame; })
  37
  38
  39 /* We prefer to have the stack allocated in the low 4GB since this
  40    allows faster context switches.  */
  41 #define ARCH_MAP_FLAGS MAP_32BIT
  42
  43 /* If it is not possible to allocate memory there retry without that
  44    flag.  */
  45 #define ARCH_RETRY_MMAP(size) \
  46   mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,                       \
  47         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0)
  48
  49
  50 /* XXX Until we have a better place keep the definitions here.  */
  51
  52 /* While there is no such syscall.  */
  53 #define __exit_thread_inline(val) \
  54   asm volatile ("syscall" :: "a" (__NR_exit), "D" (val))