1#ifndef _ASM_FUTEX_H 2#define _ASM_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_atomic_op1(insn, ret, oldval, uaddr, oparg) \ 10do { \ 11 register unsigned long r8 __asm ("r8") = 0; \ 12 __asm__ __volatile__( \ 13 " mf;; \n" \ 14 "[1:] " insn ";; \n" \ 15 " .xdata4 \"__ex_table\", 1b-., 2f-. \n" \ 16 "[2:]" \ 17 : "+r" (r8), "=r" (oldval) \ 18 : "r" (uaddr), "r" (oparg) \ 19 : "memory"); \ 20 ret = r8; \ 21} while (0) 22 23#define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \ 24do { \ 25 register unsigned long r8 __asm ("r8") = 0; \ 26 int val, newval; \ 27 do { \ 28 __asm__ __volatile__( \ 29 " mf;; \n" \ 30 "[1:] ld4 %3=[%4];; \n" \ 31 " mov %2=%3 \n" \ 32 insn ";; \n" \ 33 " mov ar.ccv=%2;; \n" \ 34 "[2:] cmpxchg4.acq %1=[%4],%3,ar.ccv;; \n" \ 35 " .xdata4 \"__ex_table\", 1b-., 3f-.\n" \ 36 " .xdata4 \"__ex_table\", 2b-., 3f-.\n" \ 37 "[3:]" \ 38 : "+r" (r8), "=r" (val), "=&r" (oldval), \ 39 "=&r" (newval) \ 40 : "r" (uaddr), "r" (oparg) \ 41 : "memory"); \ 42 if (unlikely (r8)) \ 43 break; \ 44 } while (unlikely (val != oldval)); \ 45 ret = r8; \ 46} while (0) 47 48static inline int 49futex_atomic_op_inuser (int encoded_op, int __user *uaddr) 50{ 51 int op = (encoded_op >> 28) & 7; 52 int cmp = (encoded_op >> 24) & 15; 53 int oparg = (encoded_op << 8) >> 20; 54 int cmparg = (encoded_op << 20) >> 20; 55 int oldval = 0, ret; 56 if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) 57 oparg = 1 << oparg; 58 59 if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) 60 return -EFAULT; 61 62 pagefault_disable(); 63 64 switch (op) { 65 case FUTEX_OP_SET: 66 __futex_atomic_op1("xchg4 %1=[%2],%3", ret, oldval, uaddr, 67 oparg); 68 break; 69 case FUTEX_OP_ADD: 70 __futex_atomic_op2("add %3=%3,%5", ret, oldval, uaddr, oparg); 71 break; 72 case FUTEX_OP_OR: 73 __futex_atomic_op2("or %3=%3,%5", ret, oldval, uaddr, oparg); 74 break; 75 case FUTEX_OP_ANDN: 76 __futex_atomic_op2("and %3=%3,%5", ret, oldval, uaddr, 77 ~oparg); 78 break; 79 case FUTEX_OP_XOR: 80 __futex_atomic_op2("xor %3=%3,%5", ret, oldval, uaddr, oparg); 81 break; 82 default: 83 ret = -ENOSYS; 84 } 85 86 pagefault_enable(); 87 88 if (!ret) { 89 switch (cmp) { 90 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; 91 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; 92 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; 93 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; 94 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; 95 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; 96 default: ret = -ENOSYS; 97 } 98 } 99 return ret; 100} 101 102static inline int 103futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) 104{ 105 if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) 106 return -EFAULT; 107 108 { 109 register unsigned long r8 __asm ("r8"); 110 __asm__ __volatile__( 111 " mf;; \n" 112 " mov ar.ccv=%3;; \n" 113 "[1:] cmpxchg4.acq %0=[%1],%2,ar.ccv \n" 114 " .xdata4 \"__ex_table\", 1b-., 2f-. \n" 115 "[2:]" 116 : "=r" (r8) 117 : "r" (uaddr), "r" (newval), 118 "rO" ((long) (unsigned) oldval) 119 : "memory"); 120 return r8; 121 } 122} 123 124#endif /* _ASM_FUTEX_H */ 125