1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _SPARC64_FUTEX_H 3 #define _SPARC64_FUTEX_H 4 5 #include <linux/futex.h> 6 #include <linux/uaccess.h> 7 #include <asm/errno.h> 8 9 #define __futex_cas_op(insn, ret, oldval, uaddr, oparg) \ 10 __asm__ __volatile__( \ 11 "\n1: lduwa [%3] %%asi, %2\n" \ 12 " " insn "\n" \ 13 "2: casa [%3] %%asi, %2, %1\n" \ 14 " cmp %2, %1\n" \ 15 " bne,pn %%icc, 1b\n" \ 16 " mov 0, %0\n" \ 17 "3:\n" \ 18 " .section .fixup,#alloc,#execinstr\n" \ 19 " .align 4\n" \ 20 "4: sethi %%hi(3b), %0\n" \ 21 " jmpl %0 + %%lo(3b), %%g0\n" \ 22 " mov %5, %0\n" \ 23 " .previous\n" \ 24 " .section __ex_table,\"a\"\n" \ 25 " .align 4\n" \ 26 " .word 1b, 4b\n" \ 27 " .word 2b, 4b\n" \ 28 " .previous\n" \ 29 : "=&r" (ret), "=&r" (oldval), "=&r" (tem) \ 30 : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \ 31 : "memory") 32 33 static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, 34 u32 __user *uaddr) 35 { 36 int oldval = 0, ret, tem; 37 38 if (unlikely((((unsigned long) uaddr) & 0x3UL))) 39 return -EINVAL; 40 41 switch (op) { 42 case FUTEX_OP_SET: 43 __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg); 44 break; 45 case FUTEX_OP_ADD: 46 __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg); 47 break; 48 case FUTEX_OP_OR: 49 __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg); 50 break; 51 case FUTEX_OP_ANDN: 52 __futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg); 53 break; 54 case FUTEX_OP_XOR: 55 __futex_cas_op("xor\t%2, %4, %1", 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 73 __asm__ __volatile__( 74 "\n1: casa [%4] %%asi, %3, %1\n" 75 "2:\n" 76 " .section .fixup,#alloc,#execinstr\n" 77 " .align 4\n" 78 "3: sethi %%hi(2b), %0\n" 79 " jmpl %0 + %%lo(2b), %%g0\n" 80 " mov %5, %0\n" 81 " .previous\n" 82 " .section __ex_table,\"a\"\n" 83 " .align 4\n" 84 " .word 1b, 3b\n" 85 " .previous\n" 86 : "+r" (ret), "=r" (newval) 87 : "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT) 88 : "memory"); 89 90 *uval = newval; 91 return ret; 92 } 93 94 #endif /* !(_SPARC64_FUTEX_H) */ 95