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d614a753 | 1 | /* Copyright (C) 1999-2020 Free Software Foundation, Inc. |
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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 | |
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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. | |
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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 | |
3214b89b | 12 | Lesser General Public License for more details. |
761fb242 | 13 | |
3214b89b | 14 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff | 15 | License along with the GNU C Library. If not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
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17 | |
18 | /* This file contains a bit of information about the stack allocation | |
19 | of the processor. */ | |
20 | ||
21 | #ifndef _STACKINFO_H | |
22 | #define _STACKINFO_H 1 | |
23 | ||
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24 | #include <elf.h> |
25 | ||
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26 | /* On m68k the stack grows down. */ |
27 | #define _STACK_GROWS_DOWN 1 | |
28 | ||
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29 | /* Default to an executable stack. PF_X can be overridden if PT_GNU_STACK |
30 | is present, but it is presumed absent. */ | |
31 | #define DEFAULT_STACK_PERMS (PF_R|PF_W|PF_X) | |
32 | ||
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33 | /* Access to the stack pointer. */ |
34 | #define stackinfo_get_sp() \ | |
35 | ({ void *p__; asm volatile ("move.l %%sp, %0" : "=r" (p__)); p__; }) | |
36 | #define stackinfo_sub_sp(ptr) \ | |
37 | ({ ptrdiff_t d__; \ | |
38 | asm volatile ("sub.l %%sp, %0" : "=r" (d__) : "0" (ptr)); \ | |
39 | d__; }) | |
40 | ||
761fb242 | 41 | #endif /* stackinfo.h */ |