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| /* SPDX-License-Identifier: GPL-2.0 */
| #ifndef _ASM_ALPHA_FUTEX_H
| #define _ASM_ALPHA_FUTEX_H
|
| #ifdef __KERNEL__
|
| #include <linux/futex.h>
| #include <linux/uaccess.h>
| #include <asm/errno.h>
| #include <asm/barrier.h>
|
| #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
| __asm__ __volatile__( \
| __ASM_SMP_MB \
| "1: ldl_l %0,0(%2)\n" \
| insn \
| "2: stl_c %1,0(%2)\n" \
| " beq %1,4f\n" \
| " mov $31,%1\n" \
| "3: .subsection 2\n" \
| "4: br 1b\n" \
| " .previous\n" \
| EXC(1b,3b,$31,%1) \
| EXC(2b,3b,$31,%1) \
| : "=&r" (oldval), "=&r"(ret) \
| : "r" (uaddr), "r"(oparg) \
| : "memory")
|
| static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
| u32 __user *uaddr)
| {
| int oldval = 0, ret;
|
| if (!access_ok(uaddr, sizeof(u32)))
| return -EFAULT;
|
| switch (op) {
| case FUTEX_OP_SET:
| __futex_atomic_op("mov %3,%1\n", ret, oldval, uaddr, oparg);
| break;
| case FUTEX_OP_ADD:
| __futex_atomic_op("addl %0,%3,%1\n", ret, oldval, uaddr, oparg);
| break;
| case FUTEX_OP_OR:
| __futex_atomic_op("or %0,%3,%1\n", ret, oldval, uaddr, oparg);
| break;
| case FUTEX_OP_ANDN:
| __futex_atomic_op("andnot %0,%3,%1\n", ret, oldval, uaddr, oparg);
| break;
| case FUTEX_OP_XOR:
| __futex_atomic_op("xor %0,%3,%1\n", ret, oldval, uaddr, oparg);
| break;
| default:
| ret = -ENOSYS;
| }
|
| if (!ret)
| *oval = oldval;
|
| return ret;
| }
|
| static inline int
| futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
| u32 oldval, u32 newval)
| {
| int ret = 0, cmp;
| u32 prev;
|
| if (!access_ok(uaddr, sizeof(u32)))
| return -EFAULT;
|
| __asm__ __volatile__ (
| __ASM_SMP_MB
| "1: ldl_l %1,0(%3)\n"
| " cmpeq %1,%4,%2\n"
| " beq %2,3f\n"
| " mov %5,%2\n"
| "2: stl_c %2,0(%3)\n"
| " beq %2,4f\n"
| "3: .subsection 2\n"
| "4: br 1b\n"
| " .previous\n"
| EXC(1b,3b,$31,%0)
| EXC(2b,3b,$31,%0)
| : "+r"(ret), "=&r"(prev), "=&r"(cmp)
| : "r"(uaddr), "r"((long)(int)oldval), "r"(newval)
| : "memory");
|
| *uval = prev;
| return ret;
| }
|
| #endif /* __KERNEL__ */
| #endif /* _ASM_ALPHA_FUTEX_H */
|
|
