| 1 | /* Copyright (C) 2002-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | /* Default stack size. */ |
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| 19 | #define ARCH_STACK_DEFAULT_SIZE (2 * 1024 * 1024) |
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| 20 | |
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| 21 | /* Minimum guard size. */ |
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| 22 | #define ARCH_MIN_GUARD_SIZE 0 |
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| 23 | |
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| 24 | /* Required stack pointer alignment at beginning. SSE requires 16 |
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| 25 | bytes. */ |
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| 26 | #define STACK_ALIGN 16 |
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| 27 | |
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| 28 | /* Minimal stack size after allocating thread descriptor and guard size. */ |
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| 29 | #define MINIMAL_REST_STACK 2048 |
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| 30 | |
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| 31 | /* Alignment requirement for TCB. |
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| 32 | |
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| 33 | Some processors such as Intel Atom pay a big penalty on every |
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| 34 | access using a segment override if that segment's base is not |
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| 35 | aligned to the size of a cache line. (See Intel 64 and IA-32 |
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| 36 | Architectures Optimization Reference Manual, section 13.3.3.3, |
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| 37 | "Segment Base".) On such machines, a cache line is 64 bytes. */ |
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| 38 | #define TCB_ALIGNMENT 64 |
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| 39 | |
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| 40 | |
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| 41 | /* Location of current stack frame. */ |
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| 42 | #ifdef __x86_64__ |
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| 43 | /* The frame pointer is not usable. */ |
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| 44 | # define CURRENT_STACK_FRAME \ |
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| 45 | ({ register char *frame __asm__("rsp"); frame; }) |
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| 46 | #else |
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| 47 | # define CURRENT_STACK_FRAME __builtin_frame_address (0) |
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| 48 | #endif |
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| 49 | |
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