104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
|
/* 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(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;
|
||
|
|
}
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
#endif /* __NDS32_FUTEX_H__ */
|