| 1 |
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| 2 | #ifndef _ASM_ALPHA_FUTEX_H
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| 3 | #define _ASM_ALPHA_FUTEX_H
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| 4 |
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| 5 | #ifdef __KERNEL__
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| 6 |
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| 7 | #include <linux/futex.h>
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| 8 | #include <linux/uaccess.h>
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| 9 | #include <asm/errno.h>
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| 10 | #include <asm/barrier.h>
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| 11 |
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| 12 | #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
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| 13 | __asm__ __volatile__( \
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| 14 | __ASM_SMP_MB \
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| 15 | "1: ldl_l %0,0(%2)\n" \
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| 16 | insn \
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| 17 | "2: stl_c %1,0(%2)\n" \
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| 18 | " beq %1,4f\n" \
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| 19 | " mov $31,%1\n" \
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| 20 | "3: .subsection 2\n" \
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| 21 | "4: br 1b\n" \
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| 22 | " .previous\n" \
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| 23 | EXC(1b,3b,$31,%1) \
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| 24 | EXC(2b,3b,$31,%1) \
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| 25 | : "=&r" (oldval), "=&r"(ret) \
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| 26 | : "r" (uaddr), "r"(oparg) \
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| 27 | : "memory")
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| 28 |
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| 29 | static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
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| 30 | u32 __user *uaddr)
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| 31 | {
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| 32 | int oldval = 0, ret;
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| 33 |
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| 34 | if (!access_ok(uaddr, sizeof(u32)))
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| 35 | return -EFAULT;
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| 36 |
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| 37 | switch (op) {
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| 38 | case FUTEX_OP_SET:
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| 39 | __futex_atomic_op("mov %3,%1\n", ret, oldval, uaddr, oparg);
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| 40 | break;
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| 41 | case FUTEX_OP_ADD:
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| 42 | __futex_atomic_op("addl %0,%3,%1\n", ret, oldval, uaddr, oparg);
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| 43 | break;
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| 44 | case FUTEX_OP_OR:
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| 45 | __futex_atomic_op("or %0,%3,%1\n", ret, oldval, uaddr, oparg);
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| 46 | break;
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| 47 | case FUTEX_OP_ANDN:
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| 48 | __futex_atomic_op("andnot %0,%3,%1\n", ret, oldval, uaddr, oparg);
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| 49 | break;
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| 50 | case FUTEX_OP_XOR:
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| 51 | __futex_atomic_op("xor %0,%3,%1\n", ret, oldval, uaddr, oparg);
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| 52 | break;
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| 53 | default:
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| 54 | ret = -ENOSYS;
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| 55 | }
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| 56 |
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| 57 | if (!ret)
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| 58 | *oval = oldval;
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| 59 |
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| 60 | return ret;
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| 61 | }
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| 62 |
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| 63 | static inline int
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| 64 | futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
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| 65 | u32 oldval, u32 newval)
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| 66 | {
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| 67 | int ret = 0, cmp;
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| 68 | u32 prev;
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| 69 |
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| 70 | if (!access_ok(uaddr, sizeof(u32)))
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| 71 | return -EFAULT;
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| 72 |
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| 73 | __asm__ __volatile__ (
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| 74 | __ASM_SMP_MB
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| 75 | "1: ldl_l %1,0(%3)\n"
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| 76 | " cmpeq %1,%4,%2\n"
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| 77 | " beq %2,3f\n"
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| 78 | " mov %5,%2\n"
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| 79 | "2: stl_c %2,0(%3)\n"
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| 80 | " beq %2,4f\n"
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| 81 | "3: .subsection 2\n"
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| 82 | "4: br 1b\n"
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| 83 | " .previous\n"
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| 84 | EXC(1b,3b,$31,%0)
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| 85 | EXC(2b,3b,$31,%0)
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| 86 | : "+r"(ret), "=&r"(prev), "=&r"(cmp)
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| 87 | : "r"(uaddr), "r"((long)(int)oldval), "r"(newval)
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| 88 | : "memory");
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| 89 |
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| 90 | *uval = prev;
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| 91 | return ret;
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| 92 | }
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| 93 |
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| 94 | #endif
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| 95 | #endif
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