97 lines
2 KiB
C
97 lines
2 KiB
C
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/* 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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pagefault_disable();
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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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pagefault_enable();
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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(VERIFY_WRITE, 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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