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95 lines
2.0 KiB
95 lines
2.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_ALPHA_FUTEX_H |
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#define _ASM_ALPHA_FUTEX_H |
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#ifdef __KERNEL__ |
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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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#include <asm/barrier.h> |
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#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ |
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__asm__ __volatile__( \ |
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__ASM_SMP_MB \ |
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"1: ldl_l %0,0(%2)\n" \ |
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insn \ |
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"2: stl_c %1,0(%2)\n" \ |
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" beq %1,4f\n" \ |
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" mov $31,%1\n" \ |
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"3: .subsection 2\n" \ |
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"4: br 1b\n" \ |
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" .previous\n" \ |
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EXC(1b,3b,$31,%1) \ |
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EXC(2b,3b,$31,%1) \ |
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: "=&r" (oldval), "=&r"(ret) \ |
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: "r" (uaddr), "r"(oparg) \ |
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: "memory") |
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static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, |
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u32 __user *uaddr) |
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{ |
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int oldval = 0, ret; |
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if (!access_ok(uaddr, sizeof(u32))) |
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return -EFAULT; |
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switch (op) { |
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case FUTEX_OP_SET: |
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__futex_atomic_op("mov %3,%1\n", ret, oldval, uaddr, oparg); |
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break; |
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case FUTEX_OP_ADD: |
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__futex_atomic_op("addl %0,%3,%1\n", ret, oldval, uaddr, oparg); |
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break; |
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case FUTEX_OP_OR: |
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__futex_atomic_op("or %0,%3,%1\n", ret, oldval, uaddr, oparg); |
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break; |
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case FUTEX_OP_ANDN: |
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__futex_atomic_op("andnot %0,%3,%1\n", ret, oldval, uaddr, oparg); |
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break; |
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case FUTEX_OP_XOR: |
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__futex_atomic_op("xor %0,%3,%1\n", ret, oldval, uaddr, 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) |
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*oval = oldval; |
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return ret; |
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} |
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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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int ret = 0, cmp; |
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u32 prev; |
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if (!access_ok(uaddr, sizeof(u32))) |
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return -EFAULT; |
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__asm__ __volatile__ ( |
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__ASM_SMP_MB |
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"1: ldl_l %1,0(%3)\n" |
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" cmpeq %1,%4,%2\n" |
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" beq %2,3f\n" |
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" mov %5,%2\n" |
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"2: stl_c %2,0(%3)\n" |
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" beq %2,4f\n" |
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"3: .subsection 2\n" |
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"4: br 1b\n" |
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" .previous\n" |
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EXC(1b,3b,$31,%0) |
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EXC(2b,3b,$31,%0) |
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: "+r"(ret), "=&r"(prev), "=&r"(cmp) |
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: "r"(uaddr), "r"((long)(int)oldval), "r"(newval) |
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: "memory"); |
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*uval = prev; |
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return ret; |
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} |
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#endif /* __KERNEL__ */ |
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#endif /* _ASM_ALPHA_FUTEX_H */
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