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6d7e8eda | 1 | /* Copyright (C) 2001-2023 Free Software Foundation, Inc. |
c9cf6dde AJ |
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 | |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
c9cf6dde AJ |
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 | ||
30950a5f RA |
24 | #include <elf.h> |
25 | ||
01bd6251 AZ |
26 | #ifdef __ILP32__ |
27 | # define RSP_REG "esp" | |
28 | #else | |
29 | # define RSP_REG "rsp" | |
30 | #endif | |
31 | ||
c9cf6dde AJ |
32 | /* On x86_64 the stack grows down. */ |
33 | #define _STACK_GROWS_DOWN 1 | |
34 | ||
30950a5f RA |
35 | /* Default to an executable stack. PF_X can be overridden if PT_GNU_STACK is |
36 | * present, but it is presumed absent. */ | |
37 | #define DEFAULT_STACK_PERMS (PF_R|PF_W|PF_X) | |
38 | ||
fd537e53 UD |
39 | /* Access to the stack pointer. The macros are used in alloca_account |
40 | for which they need to act as barriers as well, hence the additional | |
41 | (unnecessary) parameters. */ | |
42 | #define stackinfo_get_sp() \ | |
8cd559cf AZ |
43 | ({ register void * p__ __asm__(RSP_REG); \ |
44 | asm volatile("" : "=r" (p__)); \ | |
45 | p__; }) | |
fd537e53 UD |
46 | #define stackinfo_sub_sp(ptr) \ |
47 | ({ ptrdiff_t d__; \ | |
01bd6251 | 48 | asm volatile ("sub %%" RSP_REG " , %0" : "=r" (d__) : "0" (ptr)); \ |
fd537e53 UD |
49 | d__; }) |
50 | ||
c9cf6dde | 51 | #endif /* stackinfo.h */ |