#ifndef _ASM_M68K_FUTEX_H #define _ASM_M68K_FUTEX_H #ifdef __KERNEL__ #if !defined(CONFIG_MMU) #include <asm-generic/futex.h> #else /* CONFIG_MMU */ #include <linux/futex.h> #include <linux/uaccess.h> #include <asm/errno.h> static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, u32 newval) { u32 val; if (unlikely(get_user(val, uaddr) != 0)) return -EFAULT; if (val == oldval && unlikely(put_user(newval, uaddr) != 0)) return -EFAULT; *uval = val; return 0; } static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr) { int op = (encoded_op >> 28) & 7; int cmp = (encoded_op >> 24) & 15; int oparg = (encoded_op << 8) >> 20; int cmparg = (encoded_op << 20) >> 20; int oldval, ret; u32 tmp; if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) oparg = 1 << oparg; pagefault_disable(); /* implies preempt_disable() */ ret = -EFAULT; if (unlikely(get_user(oldval, uaddr) != 0)) goto out_pagefault_enable; ret = 0; tmp = oldval; switch (op) { case FUTEX_OP_SET: tmp = oparg; break; case FUTEX_OP_ADD: tmp += oparg; break; case FUTEX_OP_OR: tmp |= oparg; break; case FUTEX_OP_ANDN: tmp &= ~oparg; break; case FUTEX_OP_XOR: tmp ^= oparg; break; default: ret = -ENOSYS; } if (ret == 0 && unlikely(put_user(tmp, uaddr) != 0)) ret = -EFAULT; out_pagefault_enable: pagefault_enable(); /* subsumes preempt_enable() */ if (ret == 0) { switch (cmp) { case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; default: ret = -ENOSYS; } } return ret; } #endif /* CONFIG_MMU */ #endif /* __KERNEL__ */ #endif /* _ASM_M68K_FUTEX_H */