cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

futex.h (1381B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef __ASM_SH_FUTEX_H
      3#define __ASM_SH_FUTEX_H
      4
      5#include <linux/futex.h>
      6#include <linux/uaccess.h>
      7#include <asm/errno.h>
      8
      9#if !defined(CONFIG_SMP)
     10#include <asm/futex-irq.h>
     11#elif defined(CONFIG_CPU_J2)
     12#include <asm/futex-cas.h>
     13#elif defined(CONFIG_CPU_SH4A)
     14#include <asm/futex-llsc.h>
     15#else
     16#error SMP not supported on this configuration.
     17#endif
     18
     19static inline int
     20futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
     21			      u32 oldval, u32 newval)
     22{
     23	if (!access_ok(uaddr, sizeof(u32)))
     24		return -EFAULT;
     25
     26	return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval);
     27}
     28
     29static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
     30		u32 __user *uaddr)
     31{
     32	u32 oldval, newval, prev;
     33	int ret;
     34
     35	do {
     36		ret = get_user(oldval, uaddr);
     37
     38		if (ret) break;
     39
     40		switch (op) {
     41		case FUTEX_OP_SET:
     42			newval = oparg;
     43			break;
     44		case FUTEX_OP_ADD:
     45			newval = oldval + oparg;
     46			break;
     47		case FUTEX_OP_OR:
     48			newval = oldval | oparg;
     49			break;
     50		case FUTEX_OP_ANDN:
     51			newval = oldval & ~oparg;
     52			break;
     53		case FUTEX_OP_XOR:
     54			newval = oldval ^ oparg;
     55			break;
     56		default:
     57			ret = -ENOSYS;
     58			break;
     59		}
     60
     61		if (ret) break;
     62
     63		ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
     64	} while (!ret && prev != oldval);
     65
     66	if (!ret)
     67		*oval = oldval;
     68
     69	return ret;
     70}
     71
     72#endif /* __ASM_SH_FUTEX_H */