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Linux/arch/hexagon/include/asm/futex.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _ASM_HEXAGON_FUTEX_H
  3 #define _ASM_HEXAGON_FUTEX_H
  4 
  5 #ifdef __KERNEL__
  6 
  7 #include <linux/futex.h>
  8 #include <linux/uaccess.h>
  9 #include <asm/errno.h>
 10 
 11 /* XXX TODO-- need to add sync barriers! */
 12 
 13 #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
 14         __asm__ __volatile( \
 15         "1: %0 = memw_locked(%3);\n" \
 16             /* For example: %1 = %4 */ \
 17             insn \
 18         "2: memw_locked(%3,p2) = %1;\n" \
 19         "   if (!p2) jump 1b;\n" \
 20         "   %1 = #0;\n" \
 21         "3:\n" \
 22         ".section .fixup,\"ax\"\n" \
 23         "4: %1 = #%5;\n" \
 24         "   jump 3b\n" \
 25         ".previous\n" \
 26         ".section __ex_table,\"a\"\n" \
 27         ".long 1b,4b,2b,4b\n" \
 28         ".previous\n" \
 29         : "=&r" (oldval), "=&r" (ret), "+m" (*uaddr) \
 30         : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \
 31         : "p2", "memory")
 32 
 33 
 34 static inline int
 35 arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
 36 {
 37         int oldval = 0, ret;
 38 
 39         pagefault_disable();
 40 
 41         switch (op) {
 42         case FUTEX_OP_SET:
 43                 __futex_atomic_op("%1 = %4\n", ret, oldval, uaddr, oparg);
 44                 break;
 45         case FUTEX_OP_ADD:
 46                 __futex_atomic_op("%1 = add(%0,%4)\n", ret, oldval, uaddr,
 47                                   oparg);
 48                 break;
 49         case FUTEX_OP_OR:
 50                 __futex_atomic_op("%1 = or(%0,%4)\n", ret, oldval, uaddr,
 51                                   oparg);
 52                 break;
 53         case FUTEX_OP_ANDN:
 54                 __futex_atomic_op("%1 = not(%4); %1 = and(%0,%1)\n", ret,
 55                                   oldval, uaddr, oparg);
 56                 break;
 57         case FUTEX_OP_XOR:
 58                 __futex_atomic_op("%1 = xor(%0,%4)\n", ret, oldval, uaddr,
 59                                   oparg);
 60                 break;
 61         default:
 62                 ret = -ENOSYS;
 63         }
 64 
 65         pagefault_enable();
 66 
 67         if (!ret)
 68                 *oval = oldval;
 69 
 70         return ret;
 71 }
 72 
 73 static inline int
 74 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, u32 oldval,
 75                               u32 newval)
 76 {
 77         int prev;
 78         int ret;
 79 
 80         if (!access_ok(uaddr, sizeof(u32)))
 81                 return -EFAULT;
 82 
 83         __asm__ __volatile__ (
 84         "1: %1 = memw_locked(%3)\n"
 85         "   {\n"
 86         "      p2 = cmp.eq(%1,%4)\n"
 87         "      if (!p2.new) jump:NT 3f\n"
 88         "   }\n"
 89         "2: memw_locked(%3,p2) = %5\n"
 90         "   if (!p2) jump 1b\n"
 91         "3:\n"
 92         ".section .fixup,\"ax\"\n"
 93         "4: %0 = #%6\n"
 94         "   jump 3b\n"
 95         ".previous\n"
 96         ".section __ex_table,\"a\"\n"
 97         ".long 1b,4b,2b,4b\n"
 98         ".previous\n"
 99         : "+r" (ret), "=&r" (prev), "+m" (*uaddr)
100         : "r" (uaddr), "r" (oldval), "r" (newval), "i"(-EFAULT)
101         : "p2", "memory");
102 
103         *uval = prev;
104         return ret;
105 }
106 
107 #endif /* __KERNEL__ */
108 #endif /* _ASM_HEXAGON_FUTEX_H */
109 

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