mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-11-01 00:28:51 +01:00
94 lines
1.9 KiB
C
94 lines
1.9 KiB
C
#ifndef _ASM_M68K_FUTEX_H
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#define _ASM_M68K_FUTEX_H
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#ifdef __KERNEL__
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#if !defined(CONFIG_MMU)
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#include <asm-generic/futex.h>
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#else /* CONFIG_MMU */
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#include <linux/futex.h>
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#include <linux/uaccess.h>
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#include <asm/errno.h>
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static inline int
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futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
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u32 oldval, u32 newval)
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{
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u32 val;
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if (unlikely(get_user(val, uaddr) != 0))
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return -EFAULT;
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if (val == oldval && unlikely(put_user(newval, uaddr) != 0))
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return -EFAULT;
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*uval = val;
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return 0;
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}
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static inline int
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futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
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{
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int op = (encoded_op >> 28) & 7;
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int cmp = (encoded_op >> 24) & 15;
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int oparg = (encoded_op << 8) >> 20;
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int cmparg = (encoded_op << 20) >> 20;
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int oldval, ret;
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u32 tmp;
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if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
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oparg = 1 << oparg;
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pagefault_disable(); /* implies preempt_disable() */
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ret = -EFAULT;
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if (unlikely(get_user(oldval, uaddr) != 0))
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goto out_pagefault_enable;
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ret = 0;
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tmp = oldval;
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switch (op) {
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case FUTEX_OP_SET:
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tmp = oparg;
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break;
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case FUTEX_OP_ADD:
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tmp += oparg;
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break;
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case FUTEX_OP_OR:
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tmp |= oparg;
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break;
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case FUTEX_OP_ANDN:
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tmp &= ~oparg;
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break;
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case FUTEX_OP_XOR:
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tmp ^= oparg;
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break;
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default:
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ret = -ENOSYS;
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}
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if (ret == 0 && unlikely(put_user(tmp, uaddr) != 0))
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ret = -EFAULT;
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out_pagefault_enable:
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pagefault_enable(); /* subsumes preempt_enable() */
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if (ret == 0) {
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switch (cmp) {
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case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
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case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
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case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
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case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
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case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
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case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
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default: ret = -ENOSYS;
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}
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}
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return ret;
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}
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#endif /* CONFIG_MMU */
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#endif /* __KERNEL__ */
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#endif /* _ASM_M68K_FUTEX_H */
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