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 8 #define __futex_cas_op(insn, ret, oldval, uaddr, oparg) \ 9 __asm__ __volatile__( \ 10 "\n1: lduwa [%3] %%asi, %2\n" \ 11 " " insn "\n" \ 12 "2: casa [%3] %%asi, %2, %1\n" \ 13 " cmp %2, %1\n" \ 14 " bne,pn %%icc, 1b\n" \ 15 " mov 0, %0\n" \ 16 "3:\n" \ 17 " .section .fixup,#alloc,#execinstr\n" \ 18 " .align 4\n" \ 19 "4: sethi %%hi(3b), %0\n" \ 20 " jmpl %0 + %%lo(3b), %%g0\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 32 static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval, 33 u32 __user *uaddr) 34 { 35 int oldval = 0, ret, tem; 36 37 if (unlikely((((unsigned long) uaddr) & 0x3UL))) 38 return -EINVAL; 39 40 pagefault_disable(); 41 42 switch (op) { 43 case FUTEX_OP_SET: 44 __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg); 45 break; 46 case FUTEX_OP_ADD: 47 __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg); 48 break; 49 case FUTEX_OP_OR: 50 __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg); 51 break; 52 case FUTEX_OP_ANDN: 53 __futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg); 54 break; 55 case FUTEX_OP_XOR: 56 __futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg); 57 break; 58 default: 59 ret = -ENOSYS; 60 } 61 62 pagefault_enable(); 63 64 if (!ret) 65 *oval = oldval; 66 67 return ret; 68 } 69 70 static inline int 71 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, 72 u32 oldval, u32 newval) 73 { 74 int ret = 0; 75 76 __asm__ __volatile__( 77 "\n1: casa [%4] %%asi, %3, %1\n" 78 "2:\n" 79 " .section .fixup,#alloc,#execinstr\n" 80 " .align 4\n" 81 "3: sethi %%hi(2b), %0\n" 82 " jmpl %0 + %%lo(2b), %%g0\n" 83 " mov %5, %0\n" 84 " .previous\n" 85 " .section __ex_table,\"a\"\n" 86 " .align 4\n" 87 " .word 1b, 3b\n" 88 " .previous\n" 89 : "+r" (ret), "=r" (newval) 90 : "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT) 91 : "memory"); 92 93 *uval = newval; 94 return ret; 95 } 96 97 #endif /* !(_SPARC64_FUTEX_H) */ 98