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11/17/2022 06:42:15 AM
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Kbuild
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uaccess.h
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xor.h
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Editing: futex.h
Close
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_ALPHA_FUTEX_H #define _ASM_ALPHA_FUTEX_H #ifdef __KERNEL__ #include <linux/futex.h> #include <linux/uaccess.h> #include <asm/errno.h> #include <asm/barrier.h> #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ __asm__ __volatile__( \ __ASM_SMP_MB \ "1: ldl_l %0,0(%2)\n" \ insn \ "2: stl_c %1,0(%2)\n" \ " beq %1,4f\n" \ " mov $31,%1\n" \ "3: .subsection 2\n" \ "4: br 1b\n" \ " .previous\n" \ EXC(1b,3b,$31,%1) \ EXC(2b,3b,$31,%1) \ : "=&r" (oldval), "=&r"(ret) \ : "r" (uaddr), "r"(oparg) \ : "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("mov %3,%1\n", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ADD: __futex_atomic_op("addl %0,%3,%1\n", ret, oldval, uaddr, oparg); break; case FUTEX_OP_OR: __futex_atomic_op("or %0,%3,%1\n", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ANDN: __futex_atomic_op("andnot %0,%3,%1\n", ret, oldval, uaddr, oparg); break; case FUTEX_OP_XOR: __futex_atomic_op("xor %0,%3,%1\n", 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, cmp; u32 prev; if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) return -EFAULT; __asm__ __volatile__ ( __ASM_SMP_MB "1: ldl_l %1,0(%3)\n" " cmpeq %1,%4,%2\n" " beq %2,3f\n" " mov %5,%2\n" "2: stl_c %2,0(%3)\n" " beq %2,4f\n" "3: .subsection 2\n" "4: br 1b\n" " .previous\n" EXC(1b,3b,$31,%0) EXC(2b,3b,$31,%0) : "+r"(ret), "=&r"(prev), "=&r"(cmp) : "r"(uaddr), "r"((long)(int)oldval), "r"(newval) : "memory"); *uval = prev; return ret; } #endif /* __KERNEL__ */ #endif /* _ASM_ALPHA_FUTEX_H */