1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_S390_FUTEX_H 3 #define _ASM_S390_FUTEX_H 4 5 #include <linux/uaccess.h> 6 #include <linux/futex.h> 7 #include <asm/mmu_context.h> 8 #include <asm/errno.h> 9 10 #define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \ 11 asm volatile( \ 12 " sacf 256\n" \ 13 "0: l %1,0(%6)\n" \ 14 "1:"insn \ 15 "2: cs %1,%2,0(%6)\n" \ 16 "3: jl 1b\n" \ 17 " lhi %0,0\n" \ 18 "4: sacf 768\n" \ 19 EX_TABLE(0b,4b) EX_TABLE(2b,4b) EX_TABLE(3b,4b) \ 20 : "=d" (ret), "=&d" (oldval), "=&d" (newval), \ 21 "=m" (*uaddr) \ 22 : "0" (-EFAULT), "d" (oparg), "a" (uaddr), \ 23 "m" (*uaddr) : "cc"); 24 25 static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, 26 u32 __user *uaddr) 27 { 28 int oldval = 0, newval, ret; 29 30 switch (op) { 31 case FUTEX_OP_SET: 32 __futex_atomic_op("lr %2,%5\n", 33 ret, oldval, newval, uaddr, oparg); 34 break; 35 case FUTEX_OP_ADD: 36 __futex_atomic_op("lr %2,%1\nar %2,%5\n", 37 ret, oldval, newval, uaddr, oparg); 38 break; 39 case FUTEX_OP_OR: 40 __futex_atomic_op("lr %2,%1\nor %2,%5\n", 41 ret, oldval, newval, uaddr, oparg); 42 break; 43 case FUTEX_OP_ANDN: 44 __futex_atomic_op("lr %2,%1\nnr %2,%5\n", 45 ret, oldval, newval, uaddr, oparg); 46 break; 47 case FUTEX_OP_XOR: 48 __futex_atomic_op("lr %2,%1\nxr %2,%5\n", 49 ret, oldval, newval, uaddr, oparg); 50 break; 51 default: 52 ret = -ENOSYS; 53 } 54 55 if (!ret) 56 *oval = oldval; 57 58 return ret; 59 } 60 61 static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, 62 u32 oldval, u32 newval) 63 { 64 int ret; 65 66 asm volatile( 67 " sacf 256\n" 68 "0: cs %1,%4,0(%5)\n" 69 "1: la %0,0\n" 70 "2: sacf 768\n" 71 EX_TABLE(0b,2b) EX_TABLE(1b,2b) 72 : "=d" (ret), "+d" (oldval), "=m" (*uaddr) 73 : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr) 74 : "cc", "memory"); 75 *uval = oldval; 76 return ret; 77 } 78 79 #endif /* _ASM_S390_FUTEX_H */ 80