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| /* SPDX-License-Identifier: GPL-2.0 */
| #ifndef _ASM_S390_FUTEX_H
| #define _ASM_S390_FUTEX_H
|
| #include <linux/uaccess.h>
| #include <linux/futex.h>
| #include <asm/mmu_context.h>
| #include <asm/errno.h>
|
| #define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \
| asm volatile( \
| " sacf 256\n" \
| "0: l %1,0(%6)\n" \
| "1:"insn \
| "2: cs %1,%2,0(%6)\n" \
| "3: jl 1b\n" \
| " lhi %0,0\n" \
| "4: sacf 768\n" \
| EX_TABLE(0b,4b) EX_TABLE(1b,4b) \
| EX_TABLE(2b,4b) EX_TABLE(3b,4b) \
| : "=d" (ret), "=&d" (oldval), "=&d" (newval), \
| "=m" (*uaddr) \
| : "0" (-EFAULT), "d" (oparg), "a" (uaddr), \
| "m" (*uaddr) : "cc");
|
| static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
| u32 __user *uaddr)
| {
| int oldval = 0, newval, ret;
| mm_segment_t old_fs;
|
| old_fs = enable_sacf_uaccess();
| switch (op) {
| case FUTEX_OP_SET:
| __futex_atomic_op("lr %2,%5\n",
| ret, oldval, newval, uaddr, oparg);
| break;
| case FUTEX_OP_ADD:
| __futex_atomic_op("lr %2,%1\nar %2,%5\n",
| ret, oldval, newval, uaddr, oparg);
| break;
| case FUTEX_OP_OR:
| __futex_atomic_op("lr %2,%1\nor %2,%5\n",
| ret, oldval, newval, uaddr, oparg);
| break;
| case FUTEX_OP_ANDN:
| __futex_atomic_op("lr %2,%1\nnr %2,%5\n",
| ret, oldval, newval, uaddr, oparg);
| break;
| case FUTEX_OP_XOR:
| __futex_atomic_op("lr %2,%1\nxr %2,%5\n",
| ret, oldval, newval, uaddr, oparg);
| break;
| default:
| ret = -ENOSYS;
| }
| disable_sacf_uaccess(old_fs);
|
| if (!ret)
| *oval = oldval;
|
| return ret;
| }
|
| static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
| u32 oldval, u32 newval)
| {
| mm_segment_t old_fs;
| int ret;
|
| old_fs = enable_sacf_uaccess();
| asm volatile(
| " sacf 256\n"
| "0: cs %1,%4,0(%5)\n"
| "1: la %0,0\n"
| "2: sacf 768\n"
| EX_TABLE(0b,2b) EX_TABLE(1b,2b)
| : "=d" (ret), "+d" (oldval), "=m" (*uaddr)
| : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr)
| : "cc", "memory");
| disable_sacf_uaccess(old_fs);
| *uval = oldval;
| return ret;
| }
|
| #endif /* _ASM_S390_FUTEX_H */
|
|
