futex.h (cdd38c5f1ce4398ec58fec95904b75824daab7b5) futex.h (2e77a62cb3a6d2eb9dd875516411bcd131dd04e7)
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2012 ARM Ltd.
4 */
5#ifndef __ASM_FUTEX_H
6#define __ASM_FUTEX_H
7
8#include <linux/futex.h>

--- 11 unchanged lines hidden (view full) ---

20 asm volatile( \
21" prfm pstl1strm, %2\n" \
22"1: ldxr %w1, %2\n" \
23 insn "\n" \
24"2: stlxr %w0, %w3, %2\n" \
25" cbz %w0, 3f\n" \
26" sub %w4, %w4, %w0\n" \
27" cbnz %w4, 1b\n" \
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2012 ARM Ltd.
4 */
5#ifndef __ASM_FUTEX_H
6#define __ASM_FUTEX_H
7
8#include <linux/futex.h>

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20 asm volatile( \
21" prfm pstl1strm, %2\n" \
22"1: ldxr %w1, %2\n" \
23 insn "\n" \
24"2: stlxr %w0, %w3, %2\n" \
25" cbz %w0, 3f\n" \
26" sub %w4, %w4, %w0\n" \
27" cbnz %w4, 1b\n" \
28" mov %w0, %w7\n" \
28" mov %w0, %w6\n" \
29"3:\n" \
30" dmb ish\n" \
29"3:\n" \
30" dmb ish\n" \
31" .pushsection .fixup,\"ax\"\n" \
32" .align 2\n" \
33"4: mov %w0, %w6\n" \
34" b 3b\n" \
35" .popsection\n" \
36 _ASM_EXTABLE(1b, 4b) \
37 _ASM_EXTABLE(2b, 4b) \
31 _ASM_EXTABLE_UACCESS_ERR(1b, 3b, %w0) \
32 _ASM_EXTABLE_UACCESS_ERR(2b, 3b, %w0) \
38 : "=&r" (ret), "=&r" (oldval), "+Q" (*uaddr), "=&r" (tmp), \
39 "+r" (loops) \
33 : "=&r" (ret), "=&r" (oldval), "+Q" (*uaddr), "=&r" (tmp), \
34 "+r" (loops) \
40 : "r" (oparg), "Ir" (-EFAULT), "Ir" (-EAGAIN) \
35 : "r" (oparg), "Ir" (-EAGAIN) \
41 : "memory"); \
42 uaccess_disable_privileged(); \
43} while (0)
44
45static inline int
46arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *_uaddr)
47{
48 int oldval = 0, ret, tmp;

--- 51 unchanged lines hidden (view full) ---

100" prfm pstl1strm, %2\n"
101"1: ldxr %w1, %2\n"
102" sub %w3, %w1, %w5\n"
103" cbnz %w3, 4f\n"
104"2: stlxr %w3, %w6, %2\n"
105" cbz %w3, 3f\n"
106" sub %w4, %w4, %w3\n"
107" cbnz %w4, 1b\n"
36 : "memory"); \
37 uaccess_disable_privileged(); \
38} while (0)
39
40static inline int
41arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *_uaddr)
42{
43 int oldval = 0, ret, tmp;

--- 51 unchanged lines hidden (view full) ---

95" prfm pstl1strm, %2\n"
96"1: ldxr %w1, %2\n"
97" sub %w3, %w1, %w5\n"
98" cbnz %w3, 4f\n"
99"2: stlxr %w3, %w6, %2\n"
100" cbz %w3, 3f\n"
101" sub %w4, %w4, %w3\n"
102" cbnz %w4, 1b\n"
108" mov %w0, %w8\n"
103" mov %w0, %w7\n"
109"3:\n"
110" dmb ish\n"
111"4:\n"
104"3:\n"
105" dmb ish\n"
106"4:\n"
112" .pushsection .fixup,\"ax\"\n"
113"5: mov %w0, %w7\n"
114" b 4b\n"
115" .popsection\n"
116 _ASM_EXTABLE(1b, 5b)
117 _ASM_EXTABLE(2b, 5b)
107 _ASM_EXTABLE_UACCESS_ERR(1b, 4b, %w0)
108 _ASM_EXTABLE_UACCESS_ERR(2b, 4b, %w0)
118 : "+r" (ret), "=&r" (val), "+Q" (*uaddr), "=&r" (tmp), "+r" (loops)
109 : "+r" (ret), "=&r" (val), "+Q" (*uaddr), "=&r" (tmp), "+r" (loops)
119 : "r" (oldval), "r" (newval), "Ir" (-EFAULT), "Ir" (-EAGAIN)
110 : "r" (oldval), "r" (newval), "Ir" (-EAGAIN)
120 : "memory");
121 uaccess_disable_privileged();
122
123 if (!ret)
124 *uval = val;
125
126 return ret;
127}
128
129#endif /* __ASM_FUTEX_H */
111 : "memory");
112 uaccess_disable_privileged();
113
114 if (!ret)
115 *uval = val;
116
117 return ret;
118}
119
120#endif /* __ASM_FUTEX_H */