include/asm-mips/futex.h

   1 #ifndef _ASM_FUTEX_H
   2 #define _ASM_FUTEX_H
   3
   4 #ifdef __KERNEL__
   5
   6 #include <linux/futex.h>
   7 #include <asm/errno.h>
   8 #include <asm/uaccess.h>
   9 #include <asm/war.h>
  10
  11 #ifdef CONFIG_SMP
  12 #define __FUTEX_SMP_SYNC "      sync                                    \n"
  13 #else
  14 #define __FUTEX_SMP_SYNC
  15 #endif
  16
  17 #define __futex_atomic_op(insn, ret, oldval, uaddr, oparg)              \
  18 {                                                                       \
  19         if (cpu_has_llsc && R10000_LLSC_WAR) {                          \
  20                 __asm__ __volatile__(                                   \
  21                 "       .set    push                            \n"     \
  22                 "       .set    noat                            \n"     \
  23                 "       .set    mips3                           \n"     \
  24                 "1:     ll      %1, %4  # __futex_atomic_op     \n"     \
  25                 "       .set    mips0                           \n"     \
  26                 "       " insn  "                               \n"     \
  27                 "       .set    mips3                           \n"     \
  28                 "2:     sc      $1, %2                          \n"     \
  29                 "       beqzl   $1, 1b                          \n"     \
  30                 __FUTEX_SMP_SYNC                                        \
  31                 "3:                                             \n"     \
  32                 "       .set    pop                             \n"     \
  33                 "       .set    mips0                           \n"     \
  34                 "       .section .fixup,\"ax\"                  \n"     \
  35                 "4:     li      %0, %6                          \n"     \
  36                 "       j       2b                              \n"     \
  37                 "       .previous                               \n"     \
  38                 "       .section __ex_table,\"a\"               \n"     \
  39                 "       "__UA_ADDR "\t1b, 4b                    \n"     \
  40                 "       "__UA_ADDR "\t2b, 4b                    \n"     \
  41                 "       .previous                               \n"     \
  42                 : "=r" (ret), "=&r" (oldval), "=R" (*uaddr)             \
  43                 : "0" (0), "R" (*uaddr), "Jr" (oparg), "i" (-EFAULT)    \
  44                 : "memory");                                            \
  45         } else if (cpu_has_llsc) {                                      \
  46                 __asm__ __volatile__(                                   \
  47                 "       .set    push                            \n"     \
  48                 "       .set    noat                            \n"     \
  49                 "       .set    mips3                           \n"     \
  50                 "1:     ll      %1, %4  # __futex_atomic_op     \n"     \
  51                 "       .set    mips0                           \n"     \
  52                 "       " insn  "                               \n"     \
  53                 "       .set    mips3                           \n"     \
  54                 "2:     sc      $1, %2                          \n"     \
  55                 "       beqz    $1, 1b                          \n"     \
  56                 __FUTEX_SMP_SYNC                                        \
  57                 "3:                                             \n"     \
  58                 "       .set    pop                             \n"     \
  59                 "       .set    mips0                           \n"     \
  60                 "       .section .fixup,\"ax\"                  \n"     \
  61                 "4:     li      %0, %6                          \n"     \
  62                 "       j       2b                              \n"     \
  63                 "       .previous                               \n"     \
  64                 "       .section __ex_table,\"a\"               \n"     \
  65                 "       "__UA_ADDR "\t1b, 4b                    \n"     \
  66                 "       "__UA_ADDR "\t2b, 4b                    \n"     \
  67                 "       .previous                               \n"     \
  68                 : "=r" (ret), "=&r" (oldval), "=R" (*uaddr)             \
  69                 : "0" (0), "R" (*uaddr), "Jr" (oparg), "i" (-EFAULT)    \
  70                 : "memory");                                            \
  71         } else                                                          \
  72                 ret = -ENOSYS;                                          \
  73 }
  74
  75 static inline int
  76 futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
  77 {
  78         int op = (encoded_op >> 28) & 7;
  79         int cmp = (encoded_op >> 24) & 15;
  80         int oparg = (encoded_op << 8) >> 20;
  81         int cmparg = (encoded_op << 20) >> 20;
  82         int oldval = 0, ret;
  83         if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
  84                 oparg = 1 << oparg;
  85
  86         if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
  87                 return -EFAULT;
  88
  89         inc_preempt_count();
  90
  91         switch (op) {
  92         case FUTEX_OP_SET:
  93                 __futex_atomic_op("move $1, %z5", ret, oldval, uaddr, oparg);
  94                 break;
  95
  96         case FUTEX_OP_ADD:
  97                 __futex_atomic_op("addu $1, %1, %z5",
  98                                   ret, oldval, uaddr, oparg);
  99                 break;
 100         case FUTEX_OP_OR:
 101                 __futex_atomic_op("or   $1, %1, %z5",
 102                                   ret, oldval, uaddr, oparg);
 103                 break;
 104         case FUTEX_OP_ANDN:
 105                 __futex_atomic_op("and  $1, %1, %z5",
 106                                   ret, oldval, uaddr, ~oparg);
 107                 break;
 108         case FUTEX_OP_XOR:
 109                 __futex_atomic_op("xor  $1, %1, %z5",
 110                                   ret, oldval, uaddr, oparg);
 111                 break;
 112         default:
 113                 ret = -ENOSYS;
 114         }
 115
 116         dec_preempt_count();
 117
 118         if (!ret) {
 119                 switch (cmp) {
 120                 case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
 121                 case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
 122                 case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
 123                 case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
 124                 case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
 125                 case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
 126                 default: ret = -ENOSYS;
 127                 }
 128         }
 129         return ret;
 130 }
 131
 132 static inline int
 133 futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
 134 {
 135         int retval;
 136
 137         if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
 138                 return -EFAULT;
 139
 140         if (cpu_has_llsc && R10000_LLSC_WAR) {
 141                 __asm__ __volatile__(
 142                 "# futex_atomic_cmpxchg_inatomic                        \n"
 143                 "       .set    push                                    \n"
 144                 "       .set    noat                                    \n"
 145                 "       .set    mips3                                   \n"
 146                 "1:     ll      %0, %2                                  \n"
 147                 "       bne     %0, %z3, 3f                             \n"
 148                 "       .set    mips0                                   \n"
 149                 "       move    $1, %z4                                 \n"
 150                 "       .set    mips3                                   \n"
 151                 "2:     sc      $1, %1                                  \n"
 152                 "       beqzl   $1, 1b                                  \n"
 153                 __FUTEX_SMP_SYNC
 154                 "3:                                                     \n"
 155                 "       .set    pop                                     \n"
 156                 "       .section .fixup,\"ax\"                          \n"
 157                 "4:     li      %0, %5                                  \n"
 158                 "       j       3b                                      \n"
 159                 "       .previous                                       \n"
 160                 "       .section __ex_table,\"a\"                       \n"
 161                 "       "__UA_ADDR "\t1b, 4b                            \n"
 162                 "       "__UA_ADDR "\t2b, 4b                            \n"
 163                 "       .previous                                       \n"
 164                 : "=&r" (retval), "=R" (*uaddr)
 165                 : "R" (*uaddr), "Jr" (oldval), "Jr" (newval), "i" (-EFAULT)
 166                 : "memory");
 167         } else if (cpu_has_llsc) {
 168                 __asm__ __volatile__(
 169                 "# futex_atomic_cmpxchg_inatomic                        \n"
 170                 "       .set    push                                    \n"
 171                 "       .set    noat                                    \n"
 172                 "       .set    mips3                                   \n"
 173                 "1:     ll      %0, %2                                  \n"
 174                 "       bne     %0, %z3, 3f                             \n"
 175                 "       .set    mips0                                   \n"
 176                 "       move    $1, %z4                                 \n"
 177                 "       .set    mips3                                   \n"
 178                 "2:     sc      $1, %1                                  \n"
 179                 "       beqz    $1, 1b                                  \n"
 180                 __FUTEX_SMP_SYNC
 181                 "3:                                                     \n"
 182                 "       .set    pop                                     \n"
 183                 "       .section .fixup,\"ax\"                          \n"
 184                 "4:     li      %0, %5                                  \n"
 185                 "       j       3b                                      \n"
 186                 "       .previous                                       \n"
 187                 "       .section __ex_table,\"a\"                       \n"
 188                 "       "__UA_ADDR "\t1b, 4b                            \n"
 189                 "       "__UA_ADDR "\t2b, 4b                            \n"
 190                 "       .previous                                       \n"
 191                 : "=&r" (retval), "=R" (*uaddr)
 192                 : "R" (*uaddr), "Jr" (oldval), "Jr" (newval), "i" (-EFAULT)
 193                 : "memory");
 194         } else
 195                 return -ENOSYS;
 196
 197         return retval;
 198 }
 199
 200 #endif
 201 #endif