/* Copyright (C) 2002-2019 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper , 2002. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see . */ /* Default stack size. */ #define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) /* Required stack pointer alignment at beginning. SSE requires 16 bytes. */ #define STACK_ALIGN 16 /* Minimal stack size after allocating thread descriptor and guard size. */ #define MINIMAL_REST_STACK 2048 /* Alignment requirement for TCB. We need to store post-AVX vector registers in the TCB and we want the storage to be aligned to at least 32 bytes. Some processors such as Intel Atom pay a big penalty on every access using a segment override if that segment's base is not aligned to the size of a cache line. (See Intel 64 and IA-32 Architectures Optimization Reference Manual, section 13.3.3.3, "Segment Base".) On such machines, a cache line is 64 bytes. */ #define TCB_ALIGNMENT 64 /* Location of current stack frame. The frame pointer is not usable. */ #define CURRENT_STACK_FRAME \ ({ register char *frame __asm__("rsp"); frame; })