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Файловый менеджер - Редактировать - /usr/src/linux-headers-5.4.0-200/arch/openrisc/include/asm/futex.h

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/* SPDX-License-Identifier: GPL-2.0 / #ifndef __ASM_OPENRISC_FUTEX_H #define __ASM_OPENRISC_FUTEX_H #ifdef __KERNEL__ #include <linux/futex.h> #include <linux/uaccess.h> #include <asm/errno.h> #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ ({ \ __asm__ __volatile__ ( \ "1: l.lwa %0, %2 \n" \ insn "\n" \ "2: l.swa %2, %1 \n" \ " l.bnf 1b \n" \ " l.ori %1, r0, 0 \n" \ "3: \n" \ ".section .fixup,\"ax\" \n" \ "4: l.j 3b \n" \ " l.addi %1, r0, %3 \n" \ ".previous \n" \ ".section __ex_table,\"a\" \n" \ ".word 1b,4b,2b,4b \n" \ ".previous \n" \ : "=&r" (oldval), "=&r" (ret), "+m" (uaddr) \ : "i" (-EFAULT), "r" (oparg) \ : "cc", "memory" \ ); \ }) static inline int arch_futex_atomic_op_inuser(int op, int oparg, int oval, u32 __user uaddr) { int oldval = 0, ret; pagefault_disable(); switch (op) { case FUTEX_OP_SET: __futex_atomic_op("l.or %1,%4,%4", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ADD: __futex_atomic_op("l.add %1,%0,%4", ret, oldval, uaddr, oparg); break; case FUTEX_OP_OR: __futex_atomic_op("l.or %1,%0,%4", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ANDN: __futex_atomic_op("l.and %1,%0,%4", ret, oldval, uaddr, ~oparg); break; case FUTEX_OP_XOR: __futex_atomic_op("l.xor %1,%0,%4", ret, oldval, uaddr, oparg); break; default: ret = -ENOSYS; } pagefault_enable(); if (!ret) oval = oldval; return ret; } static inline int futex_atomic_cmpxchg_inatomic(u32 uval, u32 __user uaddr, u32 oldval, u32 newval) { int ret = 0; u32 prev; if (!access_ok(uaddr, sizeof(u32))) return -EFAULT; __asm__ __volatile__ ( \ "1: l.lwa %1, %2 \n" \ " l.sfeq %1, %3 \n" \ " l.bnf 3f \n" \ " l.nop \n" \ "2: l.swa %2, %4 \n" \ " l.bnf 1b \n" \ " l.nop \n" \ "3: \n" \ ".section .fixup,\"ax\" \n" \ "4: l.j 3b \n" \ " l.addi %0, r0, %5 \n" \ ".previous \n" \ ".section __ex_table,\"a\" \n" \ ".word 1b,4b,2b,4b \n" \ ".previous \n" \ : "+r" (ret), "=&r" (prev), "+m" (uaddr) \ : "r" (oldval), "r" (newval), "i" (-EFAULT) \ : "cc", "memory" \ ); uval = prev; return ret; } #endif / __KERNEL__ / #endif / __ASM_OPENRISC_FUTEX_H */

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