/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_PARISC_FUTEX_H #define _ASM_PARISC_FUTEX_H #ifdef __KERNEL__ #include <linux/futex.h> #include <linux/uaccess.h> #include <asm/atomic.h> #include <asm/errno.h> /* The following has to match the LWS code in syscall.S. We have sixteen four-word locks. */ static inline void _futex_spin_lock_irqsave(u32 __user *uaddr, unsigned long int *flags) { extern u32 lws_lock_start[]; long index = ((long)uaddr & 0xf0) >> 2; arch_spinlock_t *s = (arch_spinlock_t *)&lws_lock_start[index]; local_irq_save(*flags); arch_spin_lock(s); } static inline void _futex_spin_unlock_irqrestore(u32 __user *uaddr, unsigned long int *flags) { extern u32 lws_lock_start[]; long index = ((long)uaddr & 0xf0) >> 2; arch_spinlock_t *s = (arch_spinlock_t *)&lws_lock_start[index]; arch_spin_unlock(s); local_irq_restore(*flags); } static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr) { unsigned long int flags; int oldval, ret; u32 tmp; _futex_spin_lock_irqsave(uaddr, &flags); pagefault_disable(); ret = -EFAULT; if (unlikely(get_user(oldval, uaddr) != 0)) goto out_pagefault_enable; ret = 0; tmp = oldval; switch (op) { case FUTEX_OP_SET: tmp = oparg; break; case FUTEX_OP_ADD: tmp += oparg; break; case FUTEX_OP_OR: tmp |= oparg; break; case FUTEX_OP_ANDN: tmp &= ~oparg; break; case FUTEX_OP_XOR: tmp ^= oparg; break; default: ret = -ENOSYS; } if (ret == 0 && unlikely(put_user(tmp, uaddr) != 0)) ret = -EFAULT; out_pagefault_enable: pagefault_enable(); _futex_spin_unlock_irqrestore(uaddr, &flags); if (!ret) *oval = oldval; return ret; } static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval, u32 newval) { u32 val; unsigned long flags; /* futex.c wants to do a cmpxchg_inatomic on kernel NULL, which is * our gateway page, and causes no end of trouble... */ if (uaccess_kernel() && !uaddr) return -EFAULT; if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) return -EFAULT; /* HPPA has no cmpxchg in hardware and therefore the * best we can do here is use an array of locks. The * lock selected is based on a hash of the userspace * address. This should scale to a couple of CPUs. */ _futex_spin_lock_irqsave(uaddr, &flags); if (unlikely(get_user(val, uaddr) != 0)) { _futex_spin_unlock_irqrestore(uaddr, &flags); return -EFAULT; } if (val == oldval && unlikely(put_user(newval, uaddr) != 0)) { _futex_spin_unlock_irqrestore(uaddr, &flags); return -EFAULT; } *uval = val; _futex_spin_unlock_irqrestore(uaddr, &flags); return 0; } #endif /*__KERNEL__*/ #endif /*_ASM_PARISC_FUTEX_H*/
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Kbuild | File | 610 B | 0644 |
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agp.h | File | 596 B | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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asmregs.h | File | 3.04 KB | 0644 |
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assembly.h | File | 12.94 KB | 0644 |
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atomic.h | File | 8.24 KB | 0644 |
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barrier.h | File | 2.44 KB | 0644 |
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bitops.h | File | 5.89 KB | 0644 |
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bug.h | File | 2.35 KB | 0644 |
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bugs.h | File | 340 B | 0644 |
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cache.h | File | 1.59 KB | 0644 |
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cacheflush.h | File | 4.06 KB | 0644 |
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checksum.h | File | 5.48 KB | 0644 |
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cmpxchg.h | File | 3.62 KB | 0644 |
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compat.h | File | 6.52 KB | 0644 |
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compat_ucontext.h | File | 591 B | 0644 |
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delay.h | File | 533 B | 0644 |
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dma-mapping.h | File | 2.42 KB | 0644 |
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dma.h | File | 5.71 KB | 0644 |
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dwarf.h | File | 602 B | 0644 |
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eisa_bus.h | File | 702 B | 0644 |
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eisa_eeprom.h | File | 4.42 KB | 0644 |
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elf.h | File | 14.31 KB | 0644 |
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fb.h | File | 403 B | 0644 |
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fixmap.h | File | 1.15 KB | 0644 |
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floppy.h | File | 6.61 KB | 0644 |
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ftrace.h | File | 379 B | 0644 |
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futex.h | File | 2.66 KB | 0644 |
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grfioctl.h | File | 4.68 KB | 0644 |
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hardirq.h | File | 1.3 KB | 0644 |
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hardware.h | File | 4.09 KB | 0644 |
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hash.h | File | 5.07 KB | 0644 |
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hugetlb.h | File | 1.67 KB | 0644 |
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ide.h | File | 1.09 KB | 0644 |
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io.h | File | 8.14 KB | 0644 |
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irq.h | File | 1.23 KB | 0644 |
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irqflags.h | File | 1.02 KB | 0644 |
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kbdleds.h | File | 477 B | 0644 |
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kmap_types.h | File | 221 B | 0644 |
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ldcw.h | File | 2.15 KB | 0644 |
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led.h | File | 1.33 KB | 0644 |
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linkage.h | File | 759 B | 0644 |
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machdep.h | File | 349 B | 0644 |
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mckinley.h | File | 270 B | 0644 |
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mmu.h | File | 195 B | 0644 |
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mmu_context.h | File | 2.08 KB | 0644 |
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mmzone.h | File | 1.51 KB | 0644 |
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module.h | File | 527 B | 0644 |
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page.h | File | 5.42 KB | 0644 |
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parisc-device.h | File | 1.92 KB | 0644 |
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parport.h | File | 358 B | 0644 |
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pci.h | File | 6.57 KB | 0644 |
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pdc.h | File | 3.93 KB | 0644 |
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pdc_chassis.h | File | 15.06 KB | 0644 |
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pdcpat.h | File | 15 KB | 0644 |
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perf.h | File | 1.89 KB | 0644 |
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perf_event.h | File | 152 B | 0644 |
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pgalloc.h | File | 4.22 KB | 0644 |
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pgtable.h | File | 18.92 KB | 0644 |
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prefetch.h | File | 1.12 KB | 0644 |
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processor.h | File | 9.86 KB | 0644 |
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psw.h | File | 2.39 KB | 0644 |
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ptrace.h | File | 803 B | 0644 |
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ropes.h | File | 9.73 KB | 0644 |
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rt_sigframe.h | File | 745 B | 0644 |
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runway.h | File | 320 B | 0644 |
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sections.h | File | 283 B | 0644 |
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serial.h | File | 124 B | 0644 |
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shmparam.h | File | 263 B | 0644 |
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signal.h | File | 841 B | 0644 |
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smp.h | File | 1.25 KB | 0644 |
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socket.h | File | 311 B | 0644 |
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special_insns.h | File | 1015 B | 0644 |
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spinlock.h | File | 4.02 KB | 0644 |
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spinlock_types.h | File | 483 B | 0644 |
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string.h | File | 247 B | 0644 |
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superio.h | File | 3.25 KB | 0644 |
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switch_to.h | File | 332 B | 0644 |
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syscall.h | File | 1.4 KB | 0644 |
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termios.h | File | 1.72 KB | 0644 |
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thread_info.h | File | 3.15 KB | 0644 |
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timex.h | File | 372 B | 0644 |
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tlb.h | File | 672 B | 0644 |
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tlbflush.h | File | 2.63 KB | 0644 |
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topology.h | File | 900 B | 0644 |
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traps.h | File | 468 B | 0644 |
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uaccess.h | File | 6.55 KB | 0644 |
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ucontext.h | File | 327 B | 0644 |
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unaligned.h | File | 472 B | 0644 |
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unistd.h | File | 5.47 KB | 0644 |
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unwind.h | File | 2.56 KB | 0644 |
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