1 #ifndef _ASM_MICROBLAZE_FUTEX_H 2 #define _ASM_MICROBLAZE_FUTEX_H 3 4 #ifdef __KERNEL__ 5 6 #include <linux/futex.h> 7 #include <linux/uaccess.h> 8 #include <asm/errno.h> 9 10 #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \ 11 ({ \ 12 __asm__ __volatile__ ( \ 13 "1: lwx %0, %2, r0; " \ 14 insn \ 15 "2: swx %1, %2, r0; \ 16 addic %1, r0, 0; \ 17 bnei %1, 1b; \ 18 3: \ 19 .section .fixup,\"ax\"; \ 20 4: brid 3b; \ 21 addik %1, r0, %3; \ 22 .previous; \ 23 .section __ex_table,\"a\"; \ 24 .word 1b,4b,2b,4b; \ 25 .previous;" \ 26 : "=&r" (oldval), "=&r" (ret) \ 27 : "r" (uaddr), "i" (-EFAULT), "r" (oparg) \ 28 ); \ 29 }) 30 31 static inline int 32 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; 39 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) 40 oparg = 1 << oparg; 41 42 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) 43 return -EFAULT; 44 45 pagefault_disable(); 46 47 switch (op) { 48 case FUTEX_OP_SET: 49 __futex_atomic_op("or %1,%4,%4;", ret, oldval, uaddr, oparg); 50 break; 51 case FUTEX_OP_ADD: 52 __futex_atomic_op("add %1,%0,%4;", ret, oldval, uaddr, oparg); 53 break; 54 case FUTEX_OP_OR: 55 __futex_atomic_op("or %1,%0,%4;", ret, oldval, uaddr, oparg); 56 break; 57 case FUTEX_OP_ANDN: 58 __futex_atomic_op("andn %1,%0,%4;", ret, oldval, uaddr, oparg); 59 break; 60 case FUTEX_OP_XOR: 61 __futex_atomic_op("xor %1,%0,%4;", ret, oldval, uaddr, oparg); 62 break; 63 default: 64 ret = -ENOSYS; 65 } 66 67 pagefault_enable(); 68 69 if (!ret) { 70 switch (cmp) { 71 case FUTEX_OP_CMP_EQ: 72 ret = (oldval == cmparg); 73 break; 74 case FUTEX_OP_CMP_NE: 75 ret = (oldval != cmparg); 76 break; 77 case FUTEX_OP_CMP_LT: 78 ret = (oldval < cmparg); 79 break; 80 case FUTEX_OP_CMP_GE: 81 ret = (oldval >= cmparg); 82 break; 83 case FUTEX_OP_CMP_LE: 84 ret = (oldval <= cmparg); 85 break; 86 case FUTEX_OP_CMP_GT: 87 ret = (oldval > cmparg); 88 break; 89 default: 90 ret = -ENOSYS; 91 } 92 } 93 return ret; 94 } 95 96 static inline int 97 futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr, 98 u32 oldval, u32 newval) 99 { 100 int ret = 0, cmp; 101 u32 prev; 102 103 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))) 104 return -EFAULT; 105 106 __asm__ __volatile__ ("1: lwx %1, %3, r0; \ 107 cmp %2, %1, %4; \ 108 bnei %2, 3f; \ 109 2: swx %5, %3, r0; \ 110 addic %2, r0, 0; \ 111 bnei %2, 1b; \ 112 3: \ 113 .section .fixup,\"ax\"; \ 114 4: brid 3b; \ 115 addik %0, r0, %6; \ 116 .previous; \ 117 .section __ex_table,\"a\"; \ 118 .word 1b,4b,2b,4b; \ 119 .previous;" \ 120 : "+r" (ret), "=&r" (prev), "=&r"(cmp) \ 121 : "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT)); 122 123 *uval = prev; 124 return ret; 125 } 126 127 #endif /* __KERNEL__ */ 128 129 #endif 130