/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_HEXAGON_FUTEX_H #define _ASM_HEXAGON_FUTEX_H #ifdef __KERNEL__ #include <linux/futex.h> #include <linux/uaccess.h> #include <asm/errno.h> /* XXX TODO-- need to add sync barriers! */ #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ __asm__ __volatile( \ "1: %0 = memw_locked(%3);\n" \ /* For example: %1 = %4 */ \ insn \ "2: memw_locked(%3,p2) = %1;\n" \ " if (!p2) jump 1b;\n" \ " %1 = #0;\n" \ "3:\n" \ ".section .fixup,\"ax\"\n" \ "4: %1 = #%5;\n" \ " jump 3b\n" \ ".previous\n" \ ".section __ex_table,\"a\"\n" \ ".long 1b,4b,2b,4b\n" \ ".previous\n" \ : "=&r" (oldval), "=&r" (ret), "+m" (*uaddr) \ : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \ : "p2", "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("%1 = %4\n", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ADD: __futex_atomic_op("%1 = add(%0,%4)\n", ret, oldval, uaddr, oparg); break; case FUTEX_OP_OR: __futex_atomic_op("%1 = or(%0,%4)\n", ret, oldval, uaddr, oparg); break; case FUTEX_OP_ANDN: __futex_atomic_op("%1 = not(%4); %1 = and(%0,%1)\n", ret, oldval, uaddr, oparg); break; case FUTEX_OP_XOR: __futex_atomic_op("%1 = xor(%0,%4)\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 prev; int ret; if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) return -EFAULT; __asm__ __volatile__ ( "1: %1 = memw_locked(%3)\n" " {\n" " p2 = cmp.eq(%1,%4)\n" " if (!p2.new) jump:NT 3f\n" " }\n" "2: memw_locked(%3,p2) = %5\n" " if (!p2) jump 1b\n" "3:\n" ".section .fixup,\"ax\"\n" "4: %0 = #%6\n" " jump 3b\n" ".previous\n" ".section __ex_table,\"a\"\n" ".long 1b,4b,2b,4b\n" ".previous\n" : "+r" (ret), "=&r" (prev), "+m" (*uaddr) : "r" (uaddr), "r" (oldval), "r" (newval), "i"(-EFAULT) : "p2", "memory"); *uval = prev; return ret; } #endif /* __KERNEL__ */ #endif /* _ASM_HEXAGON_FUTEX_H */
Name | Type | Size | Permission | Actions |
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Kbuild | File | 886 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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atomic.h | File | 5.27 KB | 0644 |
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bitops.h | File | 6.62 KB | 0644 |
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cache.h | File | 1.16 KB | 0644 |
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cacheflush.h | File | 3.8 KB | 0644 |
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checksum.h | File | 1.61 KB | 0644 |
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cmpxchg.h | File | 2.55 KB | 0644 |
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delay.h | File | 978 B | 0644 |
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dma-mapping.h | File | 1.31 KB | 0644 |
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dma.h | File | 934 B | 0644 |
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elf.h | File | 6.34 KB | 0644 |
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exec.h | File | 1.01 KB | 0644 |
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fixmap.h | File | 1.11 KB | 0644 |
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fpu.h | File | 90 B | 0644 |
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futex.h | File | 2.25 KB | 0644 |
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hexagon_vm.h | File | 6.39 KB | 0644 |
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intrinsics.h | File | 1003 B | 0644 |
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io.h | File | 6.95 KB | 0644 |
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irq.h | File | 1.13 KB | 0644 |
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irqflags.h | File | 1.46 KB | 0644 |
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kgdb.h | File | 1.36 KB | 0644 |
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linkage.h | File | 871 B | 0644 |
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mem-layout.h | File | 3.42 KB | 0644 |
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mmu.h | File | 1.1 KB | 0644 |
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mmu_context.h | File | 2.59 KB | 0644 |
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module.h | File | 910 B | 0644 |
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page.h | File | 4.74 KB | 0644 |
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perf_event.h | File | 841 B | 0644 |
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pgalloc.h | File | 4.08 KB | 0644 |
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pgtable.h | File | 14.15 KB | 0644 |
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processor.h | File | 3.8 KB | 0644 |
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smp.h | File | 1.31 KB | 0644 |
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spinlock.h | File | 3.84 KB | 0644 |
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spinlock_types.h | File | 1.15 KB | 0644 |
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string.h | File | 1.08 KB | 0644 |
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suspend.h | File | 872 B | 0644 |
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switch_to.h | File | 1.09 KB | 0644 |
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syscall.h | File | 1.38 KB | 0644 |
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thread_info.h | File | 4.05 KB | 0644 |
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time.h | File | 980 B | 0644 |
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timer-regs.h | File | 1.23 KB | 0644 |
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timex.h | File | 1.13 KB | 0644 |
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tlb.h | File | 1.21 KB | 0644 |
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tlbflush.h | File | 2.08 KB | 0644 |
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traps.h | File | 1.02 KB | 0644 |
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uaccess.h | File | 3.67 KB | 0644 |
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vdso.h | File | 941 B | 0644 |
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vm_fault.h | File | 993 B | 0644 |
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vm_mmu.h | File | 3.37 KB | 0644 |
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