/* 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(VERIFY_WRITE, 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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bitops | Folder | 0755 |
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Kbuild | File | 997 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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atomic.h | File | 3.02 KB | 0644 |
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barrier.h | File | 203 B | 0644 |
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bitops.h | File | 1.5 KB | 0644 |
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cache.h | File | 888 B | 0644 |
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cacheflush.h | File | 3.37 KB | 0644 |
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cmpxchg.h | File | 3.92 KB | 0644 |
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cpuinfo.h | File | 970 B | 0644 |
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delay.h | File | 670 B | 0644 |
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dma-mapping.h | File | 968 B | 0644 |
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elf.h | File | 2.02 KB | 0644 |
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fixmap.h | File | 2.74 KB | 0644 |
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futex.h | File | 2.24 KB | 0644 |
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io.h | File | 1.31 KB | 0644 |
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irq.h | File | 835 B | 0644 |
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irqflags.h | File | 866 B | 0644 |
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linkage.h | File | 764 B | 0644 |
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mmu.h | File | 728 B | 0644 |
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mmu_context.h | File | 1.3 KB | 0644 |
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page.h | File | 2.54 KB | 0644 |
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pgalloc.h | File | 2.57 KB | 0644 |
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pgtable.h | File | 13.96 KB | 0644 |
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processor.h | File | 2.7 KB | 0644 |
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ptrace.h | File | 3.33 KB | 0644 |
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serial.h | File | 1.11 KB | 0644 |
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smp.h | File | 822 B | 0644 |
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spinlock.h | File | 985 B | 0644 |
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spinlock_types.h | File | 188 B | 0644 |
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spr.h | File | 1.17 KB | 0644 |
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spr_defs.h | File | 22.91 KB | 0644 |
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string.h | File | 324 B | 0644 |
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syscall.h | File | 1.91 KB | 0644 |
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syscalls.h | File | 1.04 KB | 0644 |
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thread_info.h | File | 3.85 KB | 0644 |
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time.h | File | 627 B | 0644 |
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timex.h | File | 914 B | 0644 |
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tlb.h | File | 1.01 KB | 0644 |
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tlbflush.h | File | 2.05 KB | 0644 |
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uaccess.h | File | 7.98 KB | 0644 |
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unaligned.h | File | 1.7 KB | 0644 |
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unwinder.h | File | 557 B | 0644 |
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