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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
| commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
| tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/sh/include/asm/futex-cas.h | |
| parent | Initial commit. (diff) | |
| download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip | |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
| -rw-r--r-- | arch/sh/include/asm/futex-cas.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/sh/include/asm/futex-cas.h b/arch/sh/include/asm/futex-cas.h new file mode 100644 index 000000000..ed738e32b --- /dev/null +++ b/arch/sh/include/asm/futex-cas.h @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_SH_FUTEX_CAS_H +#define __ASM_SH_FUTEX_CAS_H + +static inline int atomic_futex_op_cmpxchg_inatomic(u32 *uval, + u32 __user *uaddr, + u32 oldval, u32 newval) +{ + int err = 0; + __asm__ __volatile__( + "1:\n\t" + "cas.l %2, %1, @r0\n" + "2:\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" (newval) + :"r" (oldval), "i" (-EFAULT), "z" (uaddr) + :"t", "memory"); + if (err) return err; + *uval = newval; + return 0; +} + +#endif /* __ASM_SH_FUTEX_CAS_H */ |