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 */ 82