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109 lines
2.6 KiB
109 lines
2.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_FUTEX_H |
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#define _ASM_FUTEX_H |
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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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#define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \ |
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do { \ |
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register unsigned long r8 __asm ("r8") = 0; \ |
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__asm__ __volatile__( \ |
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" mf;; \n" \ |
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"[1:] " insn ";; \n" \ |
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" .xdata4 \"__ex_table\", 1b-., 2f-. \n" \ |
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"[2:]" \ |
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: "+r" (r8), "=r" (oldval) \ |
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: "r" (uaddr), "r" (oparg) \ |
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: "memory"); \ |
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ret = r8; \ |
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} while (0) |
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#define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \ |
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do { \ |
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register unsigned long r8 __asm ("r8") = 0; \ |
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int val, newval; \ |
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do { \ |
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__asm__ __volatile__( \ |
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" mf;; \n" \ |
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"[1:] ld4 %3=[%4];; \n" \ |
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" mov %2=%3 \n" \ |
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insn ";; \n" \ |
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" mov ar.ccv=%2;; \n" \ |
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"[2:] cmpxchg4.acq %1=[%4],%3,ar.ccv;; \n" \ |
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" .xdata4 \"__ex_table\", 1b-., 3f-.\n" \ |
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" .xdata4 \"__ex_table\", 2b-., 3f-.\n" \ |
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"[3:]" \ |
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: "+r" (r8), "=r" (val), "=&r" (oldval), \ |
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"=&r" (newval) \ |
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: "r" (uaddr), "r" (oparg) \ |
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: "memory"); \ |
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if (unlikely (r8)) \ |
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break; \ |
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} while (unlikely (val != oldval)); \ |
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ret = r8; \ |
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} while (0) |
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static inline int |
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arch_futex_atomic_op_inuser(int op, int oparg, int *oval, 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_op1("xchg4 %1=[%2],%3", ret, oldval, uaddr, |
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oparg); |
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break; |
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case FUTEX_OP_ADD: |
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__futex_atomic_op2("add %3=%3,%5", ret, oldval, uaddr, oparg); |
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break; |
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case FUTEX_OP_OR: |
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__futex_atomic_op2("or %3=%3,%5", ret, oldval, uaddr, oparg); |
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break; |
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case FUTEX_OP_ANDN: |
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__futex_atomic_op2("and %3=%3,%5", ret, oldval, uaddr, |
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~oparg); |
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break; |
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case FUTEX_OP_XOR: |
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__futex_atomic_op2("xor %3=%3,%5", 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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if (!access_ok(uaddr, sizeof(u32))) |
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return -EFAULT; |
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{ |
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register unsigned long r8 __asm ("r8") = 0; |
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unsigned long prev; |
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__asm__ __volatile__( |
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" mf;; \n" |
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" mov ar.ccv=%4;; \n" |
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"[1:] cmpxchg4.acq %1=[%2],%3,ar.ccv \n" |
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" .xdata4 \"__ex_table\", 1b-., 2f-. \n" |
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"[2:]" |
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: "+r" (r8), "=&r" (prev) |
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: "r" (uaddr), "r" (newval), |
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"rO" ((long) (unsigned) oldval) |
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: "memory"); |
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*uval = prev; |
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return r8; |
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} |
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} |
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#endif /* _ASM_FUTEX_H */
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