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