diff options
Diffstat (limited to 'include/asm-x86/futex.h')
| -rw-r--r-- | include/asm-x86/futex.h | 140 |
1 files changed, 0 insertions, 140 deletions
diff --git a/include/asm-x86/futex.h b/include/asm-x86/futex.h deleted file mode 100644 index 06b924ef6fa..00000000000 --- a/include/asm-x86/futex.h +++ /dev/null | |||
| @@ -1,140 +0,0 @@ | |||
| 1 | #ifndef ASM_X86__FUTEX_H | ||
| 2 | #define ASM_X86__FUTEX_H | ||
| 3 | |||
| 4 | #ifdef __KERNEL__ | ||
| 5 | |||
| 6 | #include <linux/futex.h> | ||
| 7 | #include <linux/uaccess.h> | ||
| 8 | |||
| 9 | #include <asm/asm.h> | ||
| 10 | #include <asm/errno.h> | ||
| 11 | #include <asm/processor.h> | ||
| 12 | #include <asm/system.h> | ||
| 13 | |||
| 14 | #define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \ | ||
| 15 | asm volatile("1:\t" insn "\n" \ | ||
| 16 | "2:\t.section .fixup,\"ax\"\n" \ | ||
| 17 | "3:\tmov\t%3, %1\n" \ | ||
| 18 | "\tjmp\t2b\n" \ | ||
| 19 | "\t.previous\n" \ | ||
| 20 | _ASM_EXTABLE(1b, 3b) \ | ||
| 21 | : "=r" (oldval), "=r" (ret), "+m" (*uaddr) \ | ||
| 22 | : "i" (-EFAULT), "0" (oparg), "1" (0)) | ||
| 23 | |||
| 24 | #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \ | ||
| 25 | asm volatile("1:\tmovl %2, %0\n" \ | ||
| 26 | "\tmovl\t%0, %3\n" \ | ||
| 27 | "\t" insn "\n" \ | ||
| 28 | "2:\t" LOCK_PREFIX "cmpxchgl %3, %2\n" \ | ||
| 29 | "\tjnz\t1b\n" \ | ||
| 30 | "3:\t.section .fixup,\"ax\"\n" \ | ||
| 31 | "4:\tmov\t%5, %1\n" \ | ||
| 32 | "\tjmp\t3b\n" \ | ||
| 33 | "\t.previous\n" \ | ||
| 34 | _ASM_EXTABLE(1b, 4b) \ | ||
| 35 | _ASM_EXTABLE(2b, 4b) \ | ||
| 36 | : "=&a" (oldval), "=&r" (ret), \ | ||
| 37 | "+m" (*uaddr), "=&r" (tem) \ | ||
| 38 | : "r" (oparg), "i" (-EFAULT), "1" (0)) | ||
| 39 | |||
| 40 | static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr) | ||
| 41 | { | ||
| 42 | int op = (encoded_op >> 28) & 7; | ||
| 43 | int cmp = (encoded_op >> 24) & 15; | ||
| 44 | int oparg = (encoded_op << 8) >> 20; | ||
| 45 | int cmparg = (encoded_op << 20) >> 20; | ||
| 46 | int oldval = 0, ret, tem; | ||
| 47 | |||
| 48 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) | ||
| 49 | oparg = 1 << oparg; | ||
| 50 | |||
| 51 | if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) | ||
| 52 | return -EFAULT; | ||
| 53 | |||
| 54 | #if defined(CONFIG_X86_32) && !defined(CONFIG_X86_BSWAP) | ||
| 55 | /* Real i386 machines can only support FUTEX_OP_SET */ | ||
| 56 | if (op != FUTEX_OP_SET && boot_cpu_data.x86 == 3) | ||
| 57 | return -ENOSYS; | ||
| 58 | #endif | ||
| 59 | |||
| 60 | pagefault_disable(); | ||
| 61 | |||
| 62 | switch (op) { | ||
| 63 | case FUTEX_OP_SET: | ||
| 64 | __futex_atomic_op1("xchgl %0, %2", ret, oldval, uaddr, oparg); | ||
| 65 | break; | ||
| 66 | case FUTEX_OP_ADD: | ||
| 67 | __futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret, oldval, | ||
| 68 | uaddr, oparg); | ||
| 69 | break; | ||
| 70 | case FUTEX_OP_OR: | ||
| 71 | __futex_atomic_op2("orl %4, %3", ret, oldval, uaddr, oparg); | ||
| 72 | break; | ||
| 73 | case FUTEX_OP_ANDN: | ||
| 74 | __futex_atomic_op2("andl %4, %3", ret, oldval, uaddr, ~oparg); | ||
| 75 | break; | ||
| 76 | case FUTEX_OP_XOR: | ||
| 77 | __futex_atomic_op2("xorl %4, %3", ret, oldval, uaddr, oparg); | ||
| 78 | break; | ||
| 79 | default: | ||
| 80 | ret = -ENOSYS; | ||
| 81 | } | ||
| 82 | |||
| 83 | pagefault_enable(); | ||
| 84 | |||
| 85 | if (!ret) { | ||
| 86 | switch (cmp) { | ||
| 87 | case FUTEX_OP_CMP_EQ: | ||
| 88 | ret = (oldval == cmparg); | ||
| 89 | break; | ||
| 90 | case FUTEX_OP_CMP_NE: | ||
| 91 | ret = (oldval != cmparg); | ||
| 92 | break; | ||
| 93 | case FUTEX_OP_CMP_LT: | ||
| 94 | ret = (oldval < cmparg); | ||
| 95 | break; | ||
| 96 | case FUTEX_OP_CMP_GE: | ||
| 97 | ret = (oldval >= cmparg); | ||
| 98 | break; | ||
| 99 | case FUTEX_OP_CMP_LE: | ||
| 100 | ret = (oldval <= cmparg); | ||
| 101 | break; | ||
| 102 | case FUTEX_OP_CMP_GT: | ||
| 103 | ret = (oldval > cmparg); | ||
| 104 | break; | ||
| 105 | default: | ||
| 106 | ret = -ENOSYS; | ||
| 107 | } | ||
| 108 | } | ||
| 109 | return ret; | ||
| 110 | } | ||
| 111 | |||
| 112 | static inline int futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, | ||
| 113 | int newval) | ||
| 114 | { | ||
| 115 | |||
| 116 | #if defined(CONFIG_X86_32) && !defined(CONFIG_X86_BSWAP) | ||
| 117 | /* Real i386 machines have no cmpxchg instruction */ | ||
| 118 | if (boot_cpu_data.x86 == 3) | ||
| 119 | return -ENOSYS; | ||
| 120 | #endif | ||
| 121 | |||
| 122 | if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) | ||
| 123 | return -EFAULT; | ||
| 124 | |||
| 125 | asm volatile("1:\t" LOCK_PREFIX "cmpxchgl %3, %1\n" | ||
| 126 | "2:\t.section .fixup, \"ax\"\n" | ||
| 127 | "3:\tmov %2, %0\n" | ||
| 128 | "\tjmp 2b\n" | ||
| 129 | "\t.previous\n" | ||
| 130 | _ASM_EXTABLE(1b, 3b) | ||
| 131 | : "=a" (oldval), "+m" (*uaddr) | ||
| 132 | : "i" (-EFAULT), "r" (newval), "0" (oldval) | ||
| 133 | : "memory" | ||
| 134 | ); | ||
| 135 | |||
| 136 | return oldval; | ||
| 137 | } | ||
| 138 | |||
| 139 | #endif | ||
| 140 | #endif /* ASM_X86__FUTEX_H */ | ||