Release 4.18 arch/nds32/include/asm/futex.h

// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2005-2017 Andes Technology Corporation

#ifndef __NDS32_FUTEX_H__

#define __NDS32_FUTEX_H__

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


#define __futex_atomic_ex_table(err_reg)			\
	"       .pushsection __ex_table,\"a\"\n"                \
        "       .align  3\n"                                    \
        "       .long   1b, 4f\n"                               \
        "       .long   2b, 4f\n"                               \
        "       .popsection\n"                                  \
        "       .pushsection .fixup,\"ax\"\n"                   \
        "4:     move    %0, " err_reg "\n"                      \
        "       b       3b\n"                                   \
        "       .popsection"


#define __futex_atomic_op(insn, ret, oldval, tmp, uaddr, oparg)	\
	smp_mb();                                               \
        asm volatile(                                   \
        "       movi    $ta, #0\n"                              \
        "1:     llw     %1, [%2+$ta]\n"                         \
        "       " insn "\n"                                     \
        "2:     scw     %0, [%2+$ta]\n"                         \
        "       beqz    %0, 1b\n"                               \
        "       movi    %0, #0\n"                               \
        "3:\n"                                                  \
        __futex_atomic_ex_table("%4")                           \
        : "=&r" (ret), "=&r" (oldval)                           \
        : "r" (uaddr), "r" (oparg), "i" (-EFAULT)               \
        : "cc", "memory")

static inline int

futex_atomic_cmpxchg_inatomic(u32 * uval, u32 __user * uaddr,
			      u32 oldval, u32 newval)
{
	int ret = 0;
	u32 val, tmp, flags;

	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
		return -EFAULT;

	smp_mb();
	asm volatile ("       movi    $ta, #0\n"
                      "1:     llw     %1, [%6 + $ta]\n"
                      "       sub     %3, %1, %4\n"
                      "       cmovz   %2, %5, %3\n"
                      "       cmovn   %2, %1, %3\n"
                      "2:     scw     %2, [%6 + $ta]\n"
                      "       beqz    %2, 1b\n"
                      "3:\n                   " __futex_atomic_ex_table("%7")
                      :"+&r"(ret), "=&r"(val), "=&r"(tmp), "=&r"(flags)
                      :"r"(oldval), "r"(newval), "r"(uaddr), "i"(-EFAULT)
                      :"$ta", "memory");
	smp_mb();

	*uval = val;
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Greentime Hu
70
100.00%
1
100.00%
Total
70
100.00%
1
100.00%


static inline int

arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr)
{
	int oldval = 0, ret;


	pagefault_disable();
	switch (op) {
	case FUTEX_OP_SET:
		__futex_atomic_op("move   %0, %3", ret, oldval, tmp, uaddr,
				  oparg);
		break;
	case FUTEX_OP_ADD:
		__futex_atomic_op("add    %0, %1, %3", ret, oldval, tmp, uaddr,
				  oparg);
		break;
	case FUTEX_OP_OR:
		__futex_atomic_op("or     %0, %1, %3", ret, oldval, tmp, uaddr,
				  oparg);
		break;
	case FUTEX_OP_ANDN:
		__futex_atomic_op("and    %0, %1, %3", ret, oldval, tmp, uaddr,
				  ~oparg);
		break;
	case FUTEX_OP_XOR:
		__futex_atomic_op("xor    %0, %1, %3", ret, oldval, tmp, uaddr,
				  oparg);
		break;
	default:
		ret = -ENOSYS;
	}

	pagefault_enable();

	if (!ret)
		*oval = oldval;

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Greentime Hu
156
100.00%
1
100.00%
Total
156
100.00%
1
100.00%

#endif /* __NDS32_FUTEX_H__ */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Greentime Hu
272
100.00%
2
100.00%
Total
272
100.00%
2
100.00%
Directory: arch/nds32/include/asm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.