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Linux/arch/sparc/include/asm/futex_64.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _SPARC64_FUTEX_H
  3 #define _SPARC64_FUTEX_H
  4 
  5 #include <linux/futex.h>
  6 #include <linux/uaccess.h>
  7 #include <asm/errno.h>
  8 
  9 #define __futex_cas_op(insn, ret, oldval, uaddr, oparg) \
 10         __asm__ __volatile__(                           \
 11         "\n1:   lduwa   [%3] %%asi, %2\n"               \
 12         "       " insn "\n"                             \
 13         "2:     casa    [%3] %%asi, %2, %1\n"           \
 14         "       cmp     %2, %1\n"                       \
 15         "       bne,pn  %%icc, 1b\n"                    \
 16         "        mov    0, %0\n"                        \
 17         "3:\n"                                          \
 18         "       .section .fixup,#alloc,#execinstr\n"    \
 19         "       .align  4\n"                            \
 20         "4:     sethi   %%hi(3b), %0\n"                 \
 21         "       jmpl    %0 + %%lo(3b), %%g0\n"          \
 22         "        mov    %5, %0\n"                       \
 23         "       .previous\n"                            \
 24         "       .section __ex_table,\"a\"\n"            \
 25         "       .align  4\n"                            \
 26         "       .word   1b, 4b\n"                       \
 27         "       .word   2b, 4b\n"                       \
 28         "       .previous\n"                            \
 29         : "=&r" (ret), "=&r" (oldval), "=&r" (tem)      \
 30         : "r" (uaddr), "r" (oparg), "i" (-EFAULT)       \
 31         : "memory")
 32 
 33 static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
 34                 u32 __user *uaddr)
 35 {
 36         int oldval = 0, ret, tem;
 37 
 38         if (unlikely((((unsigned long) uaddr) & 0x3UL)))
 39                 return -EINVAL;
 40 
 41         pagefault_disable();
 42 
 43         switch (op) {
 44         case FUTEX_OP_SET:
 45                 __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg);
 46                 break;
 47         case FUTEX_OP_ADD:
 48                 __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg);
 49                 break;
 50         case FUTEX_OP_OR:
 51                 __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg);
 52                 break;
 53         case FUTEX_OP_ANDN:
 54                 __futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg);
 55                 break;
 56         case FUTEX_OP_XOR:
 57                 __futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg);
 58                 break;
 59         default:
 60                 ret = -ENOSYS;
 61         }
 62 
 63         pagefault_enable();
 64 
 65         if (!ret)
 66                 *oval = oldval;
 67 
 68         return ret;
 69 }
 70 
 71 static inline int
 72 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
 73                               u32 oldval, u32 newval)
 74 {
 75         int ret = 0;
 76 
 77         __asm__ __volatile__(
 78         "\n1:   casa    [%4] %%asi, %3, %1\n"
 79         "2:\n"
 80         "       .section .fixup,#alloc,#execinstr\n"
 81         "       .align  4\n"
 82         "3:     sethi   %%hi(2b), %0\n"
 83         "       jmpl    %0 + %%lo(2b), %%g0\n"
 84         "       mov     %5, %0\n"
 85         "       .previous\n"
 86         "       .section __ex_table,\"a\"\n"
 87         "       .align  4\n"
 88         "       .word   1b, 3b\n"
 89         "       .previous\n"
 90         : "+r" (ret), "=r" (newval)
 91         : "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
 92         : "memory");
 93 
 94         *uval = newval;
 95         return ret;
 96 }
 97 
 98 #endif /* !(_SPARC64_FUTEX_H) */
 99 

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