/*
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* Copyright (C) 2001,2002,2003,2004,2005 Philippe Gerum <rpm@xenomai.org>.
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*
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* Xenomai is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License,
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* or (at your option) any later version.
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*
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* Xenomai is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Xenomai; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#ifndef _COBALT_ASM_GENERIC_SYSCALL_H
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#define _COBALT_ASM_GENERIC_SYSCALL_H
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#include <linux/types.h>
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#include <linux/version.h>
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#include <linux/uaccess.h>
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#include <asm/xenomai/features.h>
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#include <asm/xenomai/wrappers.h>
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#include <asm/xenomai/machine.h>
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#include <cobalt/uapi/asm-generic/syscall.h>
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#include <cobalt/uapi/kernel/types.h>
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
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#define access_rok(addr, size) access_ok((addr), (size))
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#define access_wok(addr, size) access_ok((addr), (size))
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#else
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#define access_rok(addr, size) access_ok(VERIFY_READ, (addr), (size))
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#define access_wok(addr, size) access_ok(VERIFY_WRITE, (addr), (size))
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#endif
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#define __xn_copy_from_user(dstP, srcP, n) raw_copy_from_user(dstP, srcP, n)
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#define __xn_copy_to_user(dstP, srcP, n) raw_copy_to_user(dstP, srcP, n)
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#define __xn_put_user(src, dstP) __put_user(src, dstP)
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#define __xn_get_user(dst, srcP) __get_user(dst, srcP)
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#define __xn_strncpy_from_user(dstP, srcP, n) strncpy_from_user(dstP, srcP, n)
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static inline int cobalt_copy_from_user(void *dst, const void __user *src,
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size_t size)
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{
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size_t remaining = size;
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if (likely(access_rok(src, size)))
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remaining = __xn_copy_from_user(dst, src, size);
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if (unlikely(remaining > 0)) {
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memset(dst + (size - remaining), 0, remaining);
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return -EFAULT;
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}
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return 0;
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}
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static inline int cobalt_copy_to_user(void __user *dst, const void *src,
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size_t size)
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{
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if (unlikely(!access_wok(dst, size) ||
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__xn_copy_to_user(dst, src, size)))
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return -EFAULT;
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return 0;
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}
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static inline int cobalt_strncpy_from_user(char *dst, const char __user *src,
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size_t count)
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{
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if (unlikely(!access_rok(src, 1)))
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return -EFAULT;
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return __xn_strncpy_from_user(dst, src, count);
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}
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/*
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* NOTE: those copy helpers won't work in compat mode: use
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* sys32_get_*(), sys32_put_*() instead.
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*/
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static inline int cobalt_get_u_timespec(struct timespec64 *dst,
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const struct __user_old_timespec __user *src)
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{
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struct __user_old_timespec u_ts;
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int ret;
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ret = cobalt_copy_from_user(&u_ts, src, sizeof(u_ts));
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if (ret)
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return ret;
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dst->tv_sec = u_ts.tv_sec;
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dst->tv_nsec = u_ts.tv_nsec;
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return 0;
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}
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static inline int cobalt_put_u_timespec(
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struct __user_old_timespec __user *dst,
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const struct timespec64 *src)
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{
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struct __user_old_timespec u_ts;
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int ret;
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u_ts.tv_sec = src->tv_sec;
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u_ts.tv_nsec = src->tv_nsec;
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ret = cobalt_copy_to_user(dst, &u_ts, sizeof(*dst));
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if (ret)
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return ret;
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return 0;
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}
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static inline int cobalt_get_u_itimerspec(struct itimerspec64 *dst,
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const struct __user_old_itimerspec __user *src)
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{
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struct __user_old_itimerspec u_its;
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int ret;
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ret = cobalt_copy_from_user(&u_its, src, sizeof(u_its));
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if (ret)
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return ret;
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dst->it_interval.tv_sec = u_its.it_interval.tv_sec;
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dst->it_interval.tv_nsec = u_its.it_interval.tv_nsec;
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dst->it_value.tv_sec = u_its.it_value.tv_sec;
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dst->it_value.tv_nsec = u_its.it_value.tv_nsec;
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return 0;
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}
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static inline int cobalt_put_u_itimerspec(
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struct __user_old_itimerspec __user *dst,
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const struct itimerspec64 *src)
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{
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struct __user_old_itimerspec u_its;
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u_its.it_interval.tv_sec = src->it_interval.tv_sec;
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u_its.it_interval.tv_nsec = src->it_interval.tv_nsec;
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u_its.it_value.tv_sec = src->it_value.tv_sec;
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u_its.it_value.tv_nsec = src->it_value.tv_nsec;
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return cobalt_copy_to_user(dst, &u_its, sizeof(*dst));
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}
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/* 32bit syscall emulation */
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#define __COBALT_COMPAT_BIT 0x1
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/* 32bit syscall emulation - extended form */
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#define __COBALT_COMPATX_BIT 0x2
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#endif /* !_COBALT_ASM_GENERIC_SYSCALL_H */
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