^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #ifndef _ASM_PARISC_FUTEX_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #define _ASM_PARISC_FUTEX_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #ifdef __KERNEL__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/futex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <asm/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <asm/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) /* The following has to match the LWS code in syscall.S. We have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) sixteen four-word locks. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) _futex_spin_lock_irqsave(u32 __user *uaddr, unsigned long int *flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) extern u32 lws_lock_start[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) long index = ((long)uaddr & 0x7f8) >> 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) arch_spinlock_t *s = (arch_spinlock_t *)&lws_lock_start[index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) local_irq_save(*flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) arch_spin_lock(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) _futex_spin_unlock_irqrestore(u32 __user *uaddr, unsigned long int *flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) extern u32 lws_lock_start[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) long index = ((long)uaddr & 0x7f8) >> 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) arch_spinlock_t *s = (arch_spinlock_t *)&lws_lock_start[index];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) arch_spin_unlock(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) local_irq_restore(*flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) unsigned long int flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) int oldval, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) u32 tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) _futex_spin_lock_irqsave(uaddr, &flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) if (unlikely(get_user(oldval, uaddr) != 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) goto out_pagefault_enable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) tmp = oldval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) switch (op) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) case FUTEX_OP_SET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) tmp = oparg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) case FUTEX_OP_ADD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) tmp += oparg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) case FUTEX_OP_OR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) tmp |= oparg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) case FUTEX_OP_ANDN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) tmp &= ~oparg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) case FUTEX_OP_XOR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) tmp ^= oparg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) ret = -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (ret == 0 && unlikely(put_user(tmp, uaddr) != 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) out_pagefault_enable:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) _futex_spin_unlock_irqrestore(uaddr, &flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) *oval = oldval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) u32 oldval, u32 newval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) u32 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) /* futex.c wants to do a cmpxchg_inatomic on kernel NULL, which is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * our gateway page, and causes no end of trouble...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (uaccess_kernel() && !uaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (!access_ok(uaddr, sizeof(u32)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /* HPPA has no cmpxchg in hardware and therefore the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * best we can do here is use an array of locks. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * lock selected is based on a hash of the userspace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * address. This should scale to a couple of CPUs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) _futex_spin_lock_irqsave(uaddr, &flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (unlikely(get_user(val, uaddr) != 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) _futex_spin_unlock_irqrestore(uaddr, &flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (val == oldval && unlikely(put_user(newval, uaddr) != 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) _futex_spin_unlock_irqrestore(uaddr, &flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) *uval = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) _futex_spin_unlock_irqrestore(uaddr, &flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) #endif /*__KERNEL__*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) #endif /*_ASM_PARISC_FUTEX_H*/
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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