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/asm-extable.h> 8 #include <asm/mmu_context.h> 9 #include <asm/errno.h> 10 11 #define __futex_atomic_op(insn, ret, oldval, newval, uaddr, oparg) \ 12 asm volatile( \ 13 " sacf 256\n" \ 14 "0: l %1,0(%6)\n" \ 15 "1:"insn \ 16 "2: cs %1,%2,0(%6)\n" \ 17 "3: jl 1b\n" \ 18 " lhi %0,0\n" \ 19 "4: sacf 768\n" \ 20 EX_TABLE(0b,4b) EX_TABLE(2b,4b) EX_TABLE(3b,4b) \ 21 : "=d" (ret), "=&d" (oldval), "=&d" (newval), \ 22 "=m" (*uaddr) \ 23 : "0" (-EFAULT), "d" (oparg), "a" (uaddr), \ 24 "m" (*uaddr) : "cc"); 25 26 static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, 27 u32 __user *uaddr) 28 { 29 int oldval = 0, newval, ret; 30 31 switch (op) { 32 case FUTEX_OP_SET: 33 __futex_atomic_op("lr %2,%5\n", 34 ret, oldval, newval, uaddr, oparg); 35 break; 36 case FUTEX_OP_ADD: 37 __futex_atomic_op("lr %2,%1\nar %2,%5\n", 38 ret, oldval, newval, uaddr, oparg); 39 break; 40 case FUTEX_OP_OR: 41 __futex_atomic_op("lr %2,%1\nor %2,%5\n", 42 ret, oldval, newval, uaddr, oparg); 43 break; 44 case FUTEX_OP_ANDN: 45 __futex_atomic_op("lr %2,%1\nnr %2,%5\n", 46 ret, oldval, newval, uaddr, oparg); 47 break; 48 case FUTEX_OP_XOR: 49 __futex_atomic_op("lr %2,%1\nxr %2,%5\n", 50 ret, oldval, newval, uaddr, oparg); 51 break; 52 default: 53 ret = -ENOSYS; 54 } 55 56 if (!ret) 57 *oval = oldval; 58 59 return ret; 60 } 61 62 static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, 63 u32 oldval, u32 newval) 64 { 65 int ret; 66 67 asm volatile( 68 " sacf 256\n" 69 "0: cs %1,%4,0(%5)\n" 70 "1: la %0,0\n" 71 "2: sacf 768\n" 72 EX_TABLE(0b,2b) EX_TABLE(1b,2b) 73 : "=d" (ret), "+d" (oldval), "=m" (*uaddr) 74 : "0" (-EFAULT), "d" (newval), "a" (uaddr), "m" (*uaddr) 75 : "cc", "memory"); 76 *uval = oldval; 77 return ret; 78 } 79 80 #endif /* _ASM_S390_FUTEX_H */ 81