^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) // Copyright (C) 2005-2017 Andes Technology Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #ifndef __NDS32_FUTEX_H__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #define __NDS32_FUTEX_H__
^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/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #define __futex_atomic_ex_table(err_reg) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) " .pushsection __ex_table,\"a\"\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) " .align 3\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) " .long 1b, 4f\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) " .long 2b, 4f\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) " .popsection\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) " .pushsection .fixup,\"ax\"\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) "4: move %0, " err_reg "\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) " b 3b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) " .popsection"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define __futex_atomic_op(insn, ret, oldval, tmp, uaddr, oparg) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) smp_mb(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) asm volatile( \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) " movi $ta, #0\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) "1: llw %1, [%2+$ta]\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) " " insn "\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) "2: scw %0, [%2+$ta]\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) " beqz %0, 1b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) " movi %0, #0\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) "3:\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) __futex_atomic_ex_table("%4") \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) : "=&r" (ret), "=&r" (oldval) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) : "cc", "memory")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) futex_atomic_cmpxchg_inatomic(u32 * uval, u32 __user * uaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) u32 oldval, u32 newval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) u32 val, tmp, flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (!access_ok(uaddr, sizeof(u32)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) smp_mb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) asm volatile (" movi $ta, #0\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) "1: llw %1, [%6 + $ta]\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) " sub %3, %1, %4\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) " cmovz %2, %5, %3\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) " cmovn %2, %1, %3\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) "2: scw %2, [%6 + $ta]\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) " beqz %2, 1b\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) "3:\n " __futex_atomic_ex_table("%7")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) :"+&r"(ret), "=&r"(val), "=&r"(tmp), "=&r"(flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) :"r"(oldval), "r"(newval), "r"(uaddr), "i"(-EFAULT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) :"$ta", "memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) smp_mb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) *uval = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) int oldval = 0, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (!access_ok(uaddr, sizeof(u32)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) switch (op) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) case FUTEX_OP_SET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) __futex_atomic_op("move %0, %3", ret, oldval, tmp, uaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) oparg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) case FUTEX_OP_ADD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) __futex_atomic_op("add %0, %1, %3", ret, oldval, tmp, uaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) oparg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) case FUTEX_OP_OR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) __futex_atomic_op("or %0, %1, %3", ret, oldval, tmp, uaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) oparg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) case FUTEX_OP_ANDN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) __futex_atomic_op("and %0, %1, %3", ret, oldval, tmp, uaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) ~oparg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) case FUTEX_OP_XOR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) __futex_atomic_op("xor %0, %1, %3", ret, oldval, tmp, uaddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) oparg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) ret = -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) *oval = oldval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #endif /* __NDS32_FUTEX_H__ */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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