1 /* Copyright (C) 2002-2022 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)
42