1  /* Copyright (C) 2002-2023 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     <https://www.gnu.org/licenses/>.  */
      17  
      18  /* Default stack size.  */
      19  #define ARCH_STACK_DEFAULT_SIZE	(2 * 1024 * 1024)
      20  
      21  /* Minimum guard size.  */
      22  #define ARCH_MIN_GUARD_SIZE 0
      23  
      24  /* Required stack pointer alignment at beginning.  SSE requires 16
      25     bytes.  */
      26  #define STACK_ALIGN		16
      27  
      28  /* Minimal stack size after allocating thread descriptor and guard size.  */
      29  #define MINIMAL_REST_STACK	2048
      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)