1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_OPENRISC_FUTEX_H 3 #define __ASM_OPENRISC_FUTEX_H 4 5 #ifdef __KERNEL__ 6 7 #include <linux/futex.h> 8 #include <linux/uaccess.h> 9 #include <asm/errno.h> 10 11 #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ 12 ({ \ 13 __asm__ __volatile__ ( \ 14 "1: l.lwa %0, %2 \n" \ 15 insn "\n" \ 16 "2: l.swa %2, %1 \n" \ 17 " l.bnf 1b \n" \ 18 " l.ori %1, r0, 0 \n" \ 19 "3: \n" \ 20 ".section .fixup,\"ax\" \n" \ 21 "4: l.j 3b \n" \ 22 " l.addi %1, r0, %3 \n" \ 23 ".previous \n" \ 24 ".section __ex_table,\"a\" \n" \ 25 ".word 1b,4b,2b,4b \n" \ 26 ".previous \n" \ 27 : "=&r" (oldval), "=&r" (ret), "+m" (*uaddr) \ 28 : "i" (-EFAULT), "r" (oparg) \ 29 : "cc", "memory" \ 30 ); \ 31 }) 32 33 static inline int 34 arch_futex_atomic_op_inuser(int op, int oparg, int *oval, u32 __user *uaddr) 35 { 36 int oldval = 0, ret; 37 38 if (!access_ok(uaddr, sizeof(u32))) 39 return -EFAULT; 40 41 switch (op) { 42 case FUTEX_OP_SET: 43 __futex_atomic_op("l.or %1,%4,%4", ret, oldval, uaddr, oparg); 44 break; 45 case FUTEX_OP_ADD: 46 __futex_atomic_op("l.add %1,%0,%4", ret, oldval, uaddr, oparg); 47 break; 48 case FUTEX_OP_OR: 49 __futex_atomic_op("l.or %1,%0,%4", ret, oldval, uaddr, oparg); 50 break; 51 case FUTEX_OP_ANDN: 52 __futex_atomic_op("l.and %1,%0,%4", ret, oldval, uaddr, ~oparg); 53 break; 54 case FUTEX_OP_XOR: 55 __futex_atomic_op("l.xor %1,%0,%4", ret, oldval, uaddr, oparg); 56 break; 57 default: 58 ret = -ENOSYS; 59 } 60 61 if (!ret) 62 *oval = oldval; 63 64 return ret; 65 } 66 67 static inline int 68 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, 69 u32 oldval, u32 newval) 70 { 71 int ret = 0; 72 u32 prev; 73 74 if (!access_ok(uaddr, sizeof(u32))) 75 return -EFAULT; 76 77 __asm__ __volatile__ ( \ 78 "1: l.lwa %1, %2 \n" \ 79 " l.sfeq %1, %3 \n" \ 80 " l.bnf 3f \n" \ 81 " l.nop \n" \ 82 "2: l.swa %2, %4 \n" \ 83 " l.bnf 1b \n" \ 84 " l.nop \n" \ 85 "3: \n" \ 86 ".section .fixup,\"ax\" \n" \ 87 "4: l.j 3b \n" \ 88 " l.addi %0, r0, %5 \n" \ 89 ".previous \n" \ 90 ".section __ex_table,\"a\" \n" \ 91 ".word 1b,4b,2b,4b \n" \ 92 ".previous \n" \ 93 : "+r" (ret), "=&r" (prev), "+m" (*uaddr) \ 94 : "r" (oldval), "r" (newval), "i" (-EFAULT) \ 95 : "cc", "memory" \ 96 ); 97 98 *uval = prev; 99 return ret; 100 } 101 102 #endif /* __KERNEL__ */ 103 104 #endif /* __ASM_OPENRISC_FUTEX_H */ 105