sysdeps/arm/nptl/pthreaddef.h

   1 /* Copyright (C) 2002-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library.  If not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /* Default stack size.  */
  19 #define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024)
  20
  21 /* Required stack pointer alignment at beginning.  SSE requires 16
  22    bytes.  */
  23 #define STACK_ALIGN             16
  24
  25 /* Minimal stack size after allocating thread descriptor and guard size.  */
  26 #define MINIMAL_REST_STACK      2048
  27
  28 /* Alignment requirement for TCB.  */
  29 #define TCB_ALIGNMENT           16
  30
  31
  32 /* Location of current stack frame.
  33
  34    __builtin_frame_address (0) returns the value of the hard frame
  35    pointer, which will point at the location of the saved PC on the
  36    stack.  Below this in memory is the remainder of the linkage info,
  37    occupying 12 bytes.  Therefore in order to address from
  38    CURRENT_STACK_FRAME using "struct layout", we need to have the macro
  39    return the hard FP minus 12.  Of course, this makes no sense
  40    without the obsolete APCS stack layout...  */
  41 #define CURRENT_STACK_FRAME     (__builtin_frame_address (0) - 12)