1#ifndef _SPARC64_FUTEX_H 2#define _SPARC64_FUTEX_H 3 4#include <linux/futex.h> 5#include <asm/errno.h> 6#include <asm/system.h> 7#include <asm/uaccess.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: ba 3b\n" \ 21 " mov %5, %0\n" \ 22 " .previous\n" \ 23 " .section __ex_table,\"a\"\n" \ 24 " .align 4\n" \ 25 " .word 1b, 4b\n" \ 26 " .word 2b, 4b\n" \ 27 " .previous\n" \ 28 : "=&r" (ret), "=&r" (oldval), "=&r" (tem) \ 29 : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \ 30 : "memory") 31 32static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr) 33{ 34 int op = (encoded_op >> 28) & 7; 35 int cmp = (encoded_op >> 24) & 15; 36 int oparg = (encoded_op << 8) >> 20; 37 int cmparg = (encoded_op << 20) >> 20; 38 int oldval = 0, ret, tem; 39 40 if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))) 41 return -EFAULT; 42 if (unlikely((((unsigned long) uaddr) & 0x3UL))) 43 return -EINVAL; 44 45 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) 46 oparg = 1 << oparg; 47 48 pagefault_disable(); 49 50 switch (op) { 51 case FUTEX_OP_SET: 52 __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg); 53 break; 54 case FUTEX_OP_ADD: 55 __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg); 56 break; 57 case FUTEX_OP_OR: 58 __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg); 59 break; 60 case FUTEX_OP_ANDN: 61 __futex_cas_op("and\t%2, %4, %1", ret, oldval, uaddr, oparg); 62 break; 63 case FUTEX_OP_XOR: 64 __futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg); 65 break; 66 default: 67 ret = -ENOSYS; 68 } 69 70 pagefault_enable(); 71 72 if (!ret) { 73 switch (cmp) { 74 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; 75 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; 76 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; 77 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; 78 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; 79 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; 80 default: ret = -ENOSYS; 81 } 82 } 83 return ret; 84} 85 86static inline int 87futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) 88{ 89 __asm__ __volatile__( 90 "\n1: casa [%3] %%asi, %2, %0\n" 91 "2:\n" 92 " .section .fixup,#alloc,#execinstr\n" 93 " .align 4\n" 94 "3: ba 2b\n" 95 " mov %4, %0\n" 96 " .previous\n" 97 " .section __ex_table,\"a\"\n" 98 " .align 4\n" 99 " .word 1b, 3b\n" 100 " .previous\n" 101 : "=r" (newval) 102 : "0" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT) 103 : "memory"); 104 105 return newval; 106} 107 108#endif /* !(_SPARC64_FUTEX_H) */ 109