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 futex_atomic_op_inuser(int encoded_op, u32 __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(u32)))) 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("andn\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 86 static inline int 87 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, 88 u32 oldval, u32 newval) 89 { 90 int ret = 0; 91 92 __asm__ __volatile__( 93 "\n1: casa [%4] %%asi, %3, %1\n" 94 "2:\n" 95 " .section .fixup,#alloc,#execinstr\n" 96 " .align 4\n" 97 "3: sethi %%hi(2b), %0\n" 98 " jmpl %0 + %%lo(2b), %%g0\n" 99 " mov %5, %0\n" 100 " .previous\n" 101 " .section __ex_table,\"a\"\n" 102 " .align 4\n" 103 " .word 1b, 3b\n" 104 " .previous\n" 105 : "+r" (ret), "=r" (newval) 106 : "1" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT) 107 : "memory"); 108 109 *uval = newval; 110 return ret; 111 } 112 113 #endif /* !(_SPARC64_FUTEX_H) */ 114