/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_MICROBLAZE_FUTEX_H #define _ASM_MICROBLAZE_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: lwx %0, %2, r0; " \ insn \ "2: swx %1, %2, r0; \ addic %1, r0, 0; \ bnei %1, 1b; \ 3: \ .section .fixup,\"ax\"; \ 4: brid 3b; \ addik %1, r0, %3; \ .previous; \ .section __ex_table,\"a\"; \ .word 1b,4b,2b,4b; \ .previous;" \ : "=&r" (oldval), "=&r" (ret) \ : "r" (uaddr), "i" (-EFAULT), "r" (oparg) \ ); \ }) 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("or %1,%4,%4;", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ADD: __futex_atomic_op("add %1,%0,%4;", ret, oldval, uaddr, oparg); break; case FUTEX_OP_OR: __futex_atomic_op("or %1,%0,%4;", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ANDN: __futex_atomic_op("andn %1,%0,%4;", ret, oldval, uaddr, oparg); break; case FUTEX_OP_XOR: __futex_atomic_op("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, cmp; u32 prev; if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) return -EFAULT; __asm__ __volatile__ ("1: lwx %1, %3, r0; \ cmp %2, %1, %4; \ bnei %2, 3f; \ 2: swx %5, %3, r0; \ addic %2, r0, 0; \ bnei %2, 1b; \ 3: \ .section .fixup,\"ax\"; \ 4: brid 3b; \ addik %0, r0, %6; \ .previous; \ .section __ex_table,\"a\"; \ .word 1b,4b,2b,4b; \ .previous;" \ : "+r" (ret), "=&r" (prev), "=&r"(cmp) \ : "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT)); *uval = prev; return ret; } #endif /* __KERNEL__ */ #endif
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Kbuild | File | 742 B | 0644 |
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asm-compat.h | File | 518 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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atomic.h | File | 626 B | 0644 |
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cache.h | File | 644 B | 0644 |
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cacheflush.h | File | 4.12 KB | 0644 |
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checksum.h | File | 942 B | 0644 |
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cmpxchg.h | File | 919 B | 0644 |
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cpuinfo.h | File | 2.13 KB | 0644 |
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cputable.h | File | 1 B | 0644 |
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current.h | File | 850 B | 0644 |
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delay.h | File | 2.26 KB | 0644 |
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dma-mapping.h | File | 765 B | 0644 |
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dma.h | File | 706 B | 0644 |
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elf.h | File | 738 B | 0644 |
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entry.h | File | 1.13 KB | 0644 |
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exceptions.h | File | 2.08 KB | 0644 |
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fixmap.h | File | 1.96 KB | 0644 |
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flat.h | File | 2.26 KB | 0644 |
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ftrace.h | File | 641 B | 0644 |
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futex.h | File | 2.13 KB | 0644 |
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hash.h | File | 2.37 KB | 0644 |
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highmem.h | File | 2.2 KB | 0644 |
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hw_irq.h | File | 1 B | 0644 |
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io.h | File | 2.05 KB | 0644 |
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irq.h | File | 538 B | 0644 |
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irqflags.h | File | 2.6 KB | 0644 |
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kgdb.h | File | 739 B | 0644 |
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mmu.h | File | 4.19 KB | 0644 |
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mmu_context.h | File | 141 B | 0644 |
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mmu_context_mm.h | File | 3.91 KB | 0644 |
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module.h | File | 840 B | 0644 |
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page.h | File | 6.11 KB | 0644 |
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pci-bridge.h | File | 4.57 KB | 0644 |
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pci.h | File | 2.47 KB | 0644 |
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pgalloc.h | File | 4.74 KB | 0644 |
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pgtable.h | File | 17.66 KB | 0644 |
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processor.h | File | 4.11 KB | 0644 |
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prom.h | File | 713 B | 0644 |
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ptrace.h | File | 727 B | 0644 |
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pvr.h | File | 8.72 KB | 0644 |
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registers.h | File | 1.65 KB | 0644 |
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seccomp.h | File | 256 B | 0644 |
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sections.h | File | 637 B | 0644 |
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setup.h | File | 1.37 KB | 0644 |
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string.h | File | 630 B | 0644 |
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switch_to.h | File | 629 B | 0644 |
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syscall.h | File | 2.26 KB | 0644 |
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thread_info.h | File | 4.01 KB | 0644 |
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timex.h | File | 402 B | 0644 |
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tlb.h | File | 714 B | 0644 |
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tlbflush.h | File | 2.04 KB | 0644 |
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uaccess.h | File | 9.98 KB | 0644 |
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unaligned.h | File | 871 B | 0644 |
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unistd.h | File | 1.19 KB | 0644 |
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unwind.h | File | 719 B | 0644 |
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user.h | File | 1 B | 0644 |
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