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-llsc.h (870B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef __ASM_SH_FUTEX_LLSC_H
      3#define __ASM_SH_FUTEX_LLSC_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		"synco\n"
     12		"1:\n\t"
     13		"movli.l	@%2, r0\n\t"
     14		"mov	r0, %1\n\t"
     15		"cmp/eq	%1, %4\n\t"
     16		"bf	2f\n\t"
     17		"mov	%5, r0\n\t"
     18		"movco.l	r0, @%2\n\t"
     19		"bf	1b\n"
     20		"2:\n\t"
     21		"synco\n\t"
     22#ifdef CONFIG_MMU
     23		".section	.fixup,\"ax\"\n"
     24		"3:\n\t"
     25		"mov.l	4f, %0\n\t"
     26		"jmp	@%0\n\t"
     27		" mov	%3, %0\n\t"
     28		".balign	4\n"
     29		"4:	.long	2b\n\t"
     30		".previous\n"
     31		".section	__ex_table,\"a\"\n\t"
     32		".long	1b, 3b\n\t"
     33		".previous"
     34#endif
     35		:"+r" (err), "=&r" (*uval)
     36		:"r" (uaddr), "i" (-EFAULT), "r" (oldval), "r" (newval)
     37		:"t", "memory", "r0");
     38	if (err) return err;
     39	return 0;
     40}
     41
     42#endif /* __ASM_SH_FUTEX_LLSC_H */