cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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futex-cas.h (728B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef __ASM_SH_FUTEX_CAS_H
      3#define __ASM_SH_FUTEX_CAS_H
      4
      5static inline int atomic_futex_op_cmpxchg_inatomic(u32 *uval,
      6						   u32 __user *uaddr,
      7						   u32 oldval, u32 newval)
      8{
      9	int err = 0;
     10	__asm__ __volatile__(
     11		"1:\n\t"
     12		"cas.l	%2, %1, @r0\n"
     13		"2:\n\t"
     14#ifdef CONFIG_MMU
     15		".section	.fixup,\"ax\"\n"
     16		"3:\n\t"
     17		"mov.l	4f, %0\n\t"
     18		"jmp	@%0\n\t"
     19		" mov	%3, %0\n\t"
     20		".balign	4\n"
     21		"4:	.long	2b\n\t"
     22		".previous\n"
     23		".section	__ex_table,\"a\"\n\t"
     24		".long	1b, 3b\n\t"
     25		".previous"
     26#endif
     27		:"+r" (err), "+r" (newval)
     28		:"r" (oldval), "i" (-EFAULT), "z" (uaddr)
     29		:"t", "memory");
     30	if (err) return err;
     31	*uval = newval;
     32	return 0;
     33}
     34
     35#endif /* __ASM_SH_FUTEX_CAS_H */