43 lines
870 B
C
43 lines
870 B
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef __ASM_SH_FUTEX_LLSC_H
|
||
|
|
#define __ASM_SH_FUTEX_LLSC_H
|
||
|
|
|
||
|
|
static inline int atomic_futex_op_cmpxchg_inatomic(u32 *uval,
|
||
|
|
u32 __user *uaddr,
|
||
|
|
u32 oldval, u32 newval)
|
||
|
|
{
|
||
|
|
int err = 0;
|
||
|
|
__asm__ __volatile__(
|
||
|
|
"synco\n"
|
||
|
|
"1:\n\t"
|
||
|
|
"movli.l @%2, r0\n\t"
|
||
|
|
"mov r0, %1\n\t"
|
||
|
|
"cmp/eq %1, %4\n\t"
|
||
|
|
"bf 2f\n\t"
|
||
|
|
"mov %5, r0\n\t"
|
||
|
|
"movco.l r0, @%2\n\t"
|
||
|
|
"bf 1b\n"
|
||
|
|
"2:\n\t"
|
||
|
|
"synco\n\t"
|
||
|
|
#ifdef CONFIG_MMU
|
||
|
|
".section .fixup,\"ax\"\n"
|
||
|
|
"3:\n\t"
|
||
|
|
"mov.l 4f, %0\n\t"
|
||
|
|
"jmp @%0\n\t"
|
||
|
|
" mov %3, %0\n\t"
|
||
|
|
".balign 4\n"
|
||
|
|
"4: .long 2b\n\t"
|
||
|
|
".previous\n"
|
||
|
|
".section __ex_table,\"a\"\n\t"
|
||
|
|
".long 1b, 3b\n\t"
|
||
|
|
".previous"
|
||
|
|
#endif
|
||
|
|
:"+r" (err), "=&r" (*uval)
|
||
|
|
:"r" (uaddr), "i" (-EFAULT), "r" (oldval), "r" (newval)
|
||
|
|
:"t", "memory", "r0");
|
||
|
|
if (err) return err;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* __ASM_SH_FUTEX_LLSC_H */
|