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55175d8659
This is used in various selftests and will be handy when integrating those with nolibc. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/r/20250428-nolibc-misc-v2-4-3c043eeab06c@linutronix.de Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* mm definition for NOLIBC
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* Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
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*/
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/* make sure to include all global symbols */
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#include "../nolibc.h"
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#ifndef _NOLIBC_SYS_MMAN_H
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#define _NOLIBC_SYS_MMAN_H
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#include "../arch.h"
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#include "../sys.h"
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#ifndef sys_mmap
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static __attribute__((unused))
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void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
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off_t offset)
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{
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int n;
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#if defined(__NR_mmap2)
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n = __NR_mmap2;
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offset >>= 12;
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#else
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n = __NR_mmap;
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#endif
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return (void *)my_syscall6(n, addr, length, prot, flags, fd, offset);
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}
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#endif
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/* Note that on Linux, MAP_FAILED is -1 so we can use the generic __sysret()
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* which returns -1 upon error and still satisfy user land that checks for
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* MAP_FAILED.
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*/
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static __attribute__((unused))
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void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
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{
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void *ret = sys_mmap(addr, length, prot, flags, fd, offset);
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if ((unsigned long)ret >= -4095UL) {
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SET_ERRNO(-(long)ret);
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ret = MAP_FAILED;
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}
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return ret;
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}
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static __attribute__((unused))
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void *sys_mremap(void *old_address, size_t old_size, size_t new_size, int flags, void *new_address)
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{
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return (void *)my_syscall5(__NR_mremap, old_address, old_size,
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new_size, flags, new_address);
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}
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static __attribute__((unused))
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void *mremap(void *old_address, size_t old_size, size_t new_size, int flags, void *new_address)
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{
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void *ret = sys_mremap(old_address, old_size, new_size, flags, new_address);
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if ((unsigned long)ret >= -4095UL) {
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SET_ERRNO(-(long)ret);
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ret = MAP_FAILED;
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}
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return ret;
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}
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static __attribute__((unused))
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int sys_munmap(void *addr, size_t length)
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{
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return my_syscall2(__NR_munmap, addr, length);
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}
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static __attribute__((unused))
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int munmap(void *addr, size_t length)
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{
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return __sysret(sys_munmap(addr, length));
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}
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#endif /* _NOLIBC_SYS_MMAN_H */
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