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| /* SPDX-License-Identifier: GPL-2.0 */
| #ifndef _SPARC64_FUTEX_H
| #define _SPARC64_FUTEX_H
|
| #include <linux/futex.h>
| #include <linux/uaccess.h>
| #include <asm/errno.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 arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
| u32 __user *uaddr)
| {
| int oldval = 0, ret, tem;
|
| if (unlikely((((unsigned long) uaddr) & 0x3UL)))
| return -EINVAL;
|
| 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;
| }
|
| 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;
|
| __asm__ __volatile__(
| "\n1: casa [%4] %%asi, %3, %1\n"
| "2:\n"
| " .section .fixup,#alloc,#execinstr\n"
| " .align 4\n"
| "3: sethi %%hi(2b), %0\n"
| " jmpl %0 + %%lo(2b), %%g0\n"
| " mov %5, %0\n"
| " .previous\n"
| " .section __ex_table,\"a\"\n"
| " .align 4\n"
| " .word 1b, 3b\n"
| " .previous\n"
| : "+r" (ret), "=r" (newval)
| : "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
| : "memory");
|
| *uval = newval;
| return ret;
| }
|
| #endif /* !(_SPARC64_FUTEX_H) */
|
|
