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 pagefault_disable(); 42 43 switch (op) { 44 case FUTEX_OP_SET: 45 __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg); 46 break; 47 case FUTEX_OP_ADD: 48 __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg); 49 break; 50 case FUTEX_OP_OR: 51 __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg); 52 break; 53 case FUTEX_OP_ANDN: 54 __futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg); 55 break; 56 case FUTEX_OP_XOR: 57 __futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg); 58 break; 59 default: 60 ret = -ENOSYS; 61 } 62 63 pagefault_enable(); 64 65 if (!ret) 66 *oval = oldval; 67 68 return ret; 69 } 70 71 static inline int 72 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, 73 u32 oldval, u32 newval) 74 { 75 int ret = 0; 76 77 __asm__ __volatile__( 78 "\n1: casa [%4] %%asi, %3, %1\n" 79 "2:\n" 80 " .section .fixup,#alloc,#execinstr\n" 81 " .align 4\n" 82 "3: sethi %%hi(2b), %0\n" 83 " jmpl %0 + %%lo(2b), %%g0\n" 84 " mov %5, %0\n" 85 " .previous\n" 86 " .section __ex_table,\"a\"\n" 87 " .align 4\n" 88 " .word 1b, 3b\n" 89 " .previous\n" 90 : "+r" (ret), "=r" (newval) 91 : "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT) 92 : "memory"); 93 94 *uval = newval; 95 return ret; 96 } 97 98 #endif /* !(_SPARC64_FUTEX_H) */ 99