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| 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 | |
| 19 | static inline int |
| 20 | futex_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 | |
| 29 | static 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 */ |
| 73 |
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