stdlib: Fix stdbit.h with -Wconversion for clang
[glibc.git] / sysdeps / m68k / stackinfo.h
blob7fdb7c04c2e2610793af77a8b23a8c31080cccf0
1 /* Copyright (C) 1999-2024 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>. */
18 /* This file contains a bit of information about the stack allocation
19 of the processor. */
21 #ifndef _STACKINFO_H
22 #define _STACKINFO_H 1
24 #include <elf.h>
26 /* On m68k the stack grows down. */
27 #define _STACK_GROWS_DOWN 1
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)
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__; })
41 #endif /* stackinfo.h */