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#include <asm/futex-irq.h> 11 12static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr) 13{ 14 int op = (encoded_op >> 28) & 7; 15 int cmp = (encoded_op >> 24) & 15; 16 int oparg = (encoded_op << 8) >> 20; 17 int cmparg = (encoded_op << 20) >> 20; 18 int oldval = 0, ret; 19 20 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) 21 oparg = 1 << oparg; 22 23 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) 24 return -EFAULT; 25 26 pagefault_disable(); 27 28 switch (op) { 29 case FUTEX_OP_SET: 30 ret = atomic_futex_op_xchg_set(oparg, uaddr, &oldval); 31 break; 32 case FUTEX_OP_ADD: 33 ret = atomic_futex_op_xchg_add(oparg, uaddr, &oldval); 34 break; 35 case FUTEX_OP_OR: 36 ret = atomic_futex_op_xchg_or(oparg, uaddr, &oldval); 37 break; 38 case FUTEX_OP_ANDN: 39 ret = atomic_futex_op_xchg_and(~oparg, uaddr, &oldval); 40 break; 41 case FUTEX_OP_XOR: 42 ret = atomic_futex_op_xchg_xor(oparg, uaddr, &oldval); 43 break; 44 default: 45 ret = -ENOSYS; 46 break; 47 } 48 49 pagefault_enable(); 50 51 if (!ret) { 52 switch (cmp) { 53 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; 54 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; 55 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; 56 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; 57 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; 58 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; 59 default: ret = -ENOSYS; 60 } 61 } 62 63 return ret; 64} 65 66static inline int 67futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) 68{ 69 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) 70 return -EFAULT; 71 72 return atomic_futex_op_cmpxchg_inatomic(uaddr, oldval, newval); 73} 74 75#endif /* __KERNEL__ */ 76#endif /* __ASM_SH_FUTEX_H */ 77