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futex_64.h

#ifndef _SPARC64_FUTEX_H
#define _SPARC64_FUTEX_H

#include <linux/futex.h>
#include <linux/uaccess.h>
#include <asm/errno.h>
#include <asm/system.h>

#define __futex_cas_op(insn, ret, oldval, uaddr, oparg)     \
      __asm__ __volatile__(                     \
      "\n1: lduwa [%3] %%asi, %2\n"       \
      "     " insn "\n"                   \
      "2:   casa  [%3] %%asi, %2, %1\n"         \
      "     cmp   %2, %1\n"               \
      "     bne,pn      %%icc, 1b\n"                  \
      "      mov  0, %0\n"                \
      "3:\n"                                    \
      "     .section .fixup,#alloc,#execinstr\n"      \
      "     .align      4\n"                    \
      "4:   sethi %%hi(3b), %0\n"               \
      "     jmpl  %0 + %%lo(3b), %%g0\n"        \
      "      mov  %5, %0\n"               \
      "     .previous\n"                        \
      "     .section __ex_table,\"a\"\n"        \
      "     .align      4\n"                    \
      "     .word 1b, 4b\n"               \
      "     .word 2b, 4b\n"               \
      "     .previous\n"                        \
      : "=&r" (ret), "=&r" (oldval), "=&r" (tem)      \
      : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \
      : "memory")

static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
{
      int op = (encoded_op >> 28) & 7;
      int cmp = (encoded_op >> 24) & 15;
      int oparg = (encoded_op << 8) >> 20;
      int cmparg = (encoded_op << 20) >> 20;
      int oldval = 0, ret, tem;

      if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(int))))
            return -EFAULT;
      if (unlikely((((unsigned long) uaddr) & 0x3UL)))
            return -EINVAL;

      if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
            oparg = 1 << oparg;

      pagefault_disable();

      switch (op) {
      case FUTEX_OP_SET:
            __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg);
            break;
      case FUTEX_OP_ADD:
            __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg);
            break;
      case FUTEX_OP_OR:
            __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg);
            break;
      case FUTEX_OP_ANDN:
            __futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg);
            break;
      case FUTEX_OP_XOR:
            __futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg);
            break;
      default:
            ret = -ENOSYS;
      }

      pagefault_enable();

      if (!ret) {
            switch (cmp) {
            case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
            case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
            case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
            case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
            case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
            case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
            default: ret = -ENOSYS;
            }
      }
      return ret;
}

static inline int
futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
{
      __asm__ __volatile__(
      "\n1: casa  [%3] %%asi, %2, %0\n"
      "2:\n"
      "     .section .fixup,#alloc,#execinstr\n"
      "     .align      4\n"
      "3:   sethi %%hi(2b), %0\n"
      "     jmpl  %0 + %%lo(2b), %%g0\n"
      "      mov  %4, %0\n"
      "     .previous\n"
      "     .section __ex_table,\"a\"\n"
      "     .align      4\n"
      "     .word 1b, 3b\n"
      "     .previous\n"
      : "=r" (newval)
      : "0" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
      : "memory");

      return newval;
}

#endif /* !(_SPARC64_FUTEX_H) */

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