1#ifndef _SPARC64_FUTEX_H 2#define _SPARC64_FUTEX_H 3 4#include <linux/futex.h> 5#include <linux/uaccess.h> 6#include <asm/errno.h> 7#include <asm/system.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 33static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr) 34{ 35 int op = (encoded_op >> 28) & 7; 36 int cmp = (encoded_op >> 24) & 15; 37 int oparg = (encoded_op << 8) >> 20; 38 int cmparg = (encoded_op << 20) >> 20; 39 int oldval = 0, ret, tem; 40 41 if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))) 42 return -EFAULT; 43 if (unlikely((((unsigned long) uaddr) & 0x3UL))) 44 return -EINVAL; 45 46 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) 47 oparg = 1 << oparg; 48 49 pagefault_disable(); 50 51 switch (op) { 52 case FUTEX_OP_SET: 53 __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg); 54 break; 55 case FUTEX_OP_ADD: 56 __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg); 57 break; 58 case FUTEX_OP_OR: 59 __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg); 60 break; 61 case FUTEX_OP_ANDN: 62 __futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg); 63 break; 64 case FUTEX_OP_XOR: 65 __futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg); 66 break; 67 default: 68 ret = -ENOSYS; 69 } 70 71 pagefault_enable(); 72 73 if (!ret) { 74 switch (cmp) { 75 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; 76 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; 77 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; 78 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; 79 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; 80 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; 81 default: ret = -ENOSYS; 82 } 83 } 84 return ret; 85} 86 87static inline int 88futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) 89{ 90 __asm__ __volatile__( 91 "\n1: casa [%3] %%asi, %2, %0\n" 92 "2:\n" 93 " .section .fixup,#alloc,#execinstr\n" 94 " .align 4\n" 95 "3: sethi %%hi(2b), %0\n" 96 " jmpl %0 + %%lo(2b), %%g0\n" 97 " mov %4, %0\n" 98 " .previous\n" 99 " .section __ex_table,\"a\"\n" 100 " .align 4\n" 101 " .word 1b, 3b\n" 102 " .previous\n" 103 : "=r" (newval) 104 : "0" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT) 105 : "memory"); 106 107 return newval; 108} 109 110#endif /* !(_SPARC64_FUTEX_H) */ 111