projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| fc1d4c9c KK |
2 | #ifndef __ASM_SH_FUTEX_H |
| 3 | #define __ASM_SH_FUTEX_H | |
| 4732efbe | 4 | |
| fc1d4c9c | 5 | #ifdef __KERNEL__ |
| 4732efbe | 6 | |
| fc1d4c9c | 7 | #include <linux/futex.h> |
| 730f412c | 8 | #include <linux/uaccess.h> |
| fc1d4c9c | 9 | #include <asm/errno.h> |
| fc1d4c9c | 10 | |
| 00b73d8d | 11 | #if !defined(CONFIG_SMP) |
| fc1d4c9c | 12 | #include <asm/futex-irq.h> |
| 00b73d8d RF |
13 | #elif defined(CONFIG_CPU_J2) |
| 14 | #include <asm/futex-cas.h> | |
| 15 | #elif defined(CONFIG_CPU_SH4A) | |
| 16 | #include <asm/futex-llsc.h> | |
| 17 | #else | |
| 18 | #error SMP not supported on this configuration. | |
| 19 | #endif | |
| 20 | ||
| 21 | static inline int | |
| 22 | futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, | |
| 23 | u32 oldval, u32 newval) | |
| 24 | { | |
| 25 | if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) | |
| 26 | return -EFAULT; | |
| 27 | ||
| 28 | return atomic_futex_op_cmpxchg_inatomic(uval, uaddr, oldval, newval); | |
| 29 | } | |
| fc1d4c9c | 30 | |
| 30d6e0a4 JS |
31 | static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval, |
| 32 | u32 __user *uaddr) | |
| fc1d4c9c | 33 | { |
| 00b73d8d RF |
34 | u32 oldval, newval, prev; |
| 35 | int ret; | |
| fc1d4c9c | 36 | |
| fc1d4c9c KK |
37 | pagefault_disable(); |
| 38 | ||
| 00b73d8d RF |
39 | do { |
| 40 | if (op == FUTEX_OP_SET) | |
| 41 | ret = oldval = 0; | |
| 42 | else | |
| 43 | ret = get_user(oldval, uaddr); | |
| 44 | ||
| 45 | if (ret) break; | |
| 46 | ||
| 47 | switch (op) { | |
| 48 | case FUTEX_OP_SET: | |
| 49 | newval = oparg; | |
| 50 | break; | |
| 51 | case FUTEX_OP_ADD: | |
| 52 | newval = oldval + oparg; | |
| 53 | break; | |
| 54 | case FUTEX_OP_OR: | |
| 55 | newval = oldval | oparg; | |
| 56 | break; | |
| 57 | case FUTEX_OP_ANDN: | |
| 58 | newval = oldval & ~oparg; | |
| 59 | break; | |
| 60 | case FUTEX_OP_XOR: | |
| 61 | newval = oldval ^ oparg; | |
| 62 | break; | |
| 63 | default: | |
| 64 | ret = -ENOSYS; | |
| 65 | break; | |
| 66 | } | |
| 67 | ||
| 68 | if (ret) break; | |
| 69 | ||
| 70 | ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval); | |
| 71 | } while (!ret && prev != oldval); | |
| fc1d4c9c KK |
72 | |
| 73 | pagefault_enable(); | |
| 74 | ||
| 30d6e0a4 JS |
75 | if (!ret) |
| 76 | *oval = oldval; | |
| fc1d4c9c KK |
77 | |
| 78 | return ret; | |
| 79 | } | |
| 80 | ||
| fc1d4c9c KK |
81 | #endif /* __KERNEL__ */ |
| 82 | #endif /* __ASM_SH_FUTEX_H */ |