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