x86: merge futex_32/64.h

[sfrench/cifs-2.6.git] / include / asm-x86 / futex.h

diff --git a/include/asm-x86/futex.h b/include/asm-x86/futex.h
index 1f4610e0c613031b003ddda1afe903ce2a12b658..62828d63f1b1d4bc6d79281f3095ca546d8db9ac 100644 (file)
--- a/include/asm-x86/futex.h
+++ b/include/asm-x86/futex.h
@@ -1,5 +1,135 @@
-#ifdef CONFIG_X86_32
-# include "futex_32.h"
-#else
-# include "futex_64.h"
+#ifndef _ASM_X86_FUTEX_H
+#define _ASM_X86_FUTEX_H
+
+#ifdef __KERNEL__
+
+#include <linux/futex.h>
+
+#include <asm/asm.h>
+#include <asm/errno.h>
+#include <asm/processor.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg)    \
+  __asm__ __volatile(                                          \
+"1:    " insn "\n"                                             \
+"2:    .section .fixup,\"ax\"\n                                \
+3:     mov     %3, %1\n                                        \
+       jmp     2b\n                                            \
+       .previous\n                                             \
+       .section __ex_table,\"a\"\n                             \
+       .align  8\n"                                            \
+       _ASM_PTR "1b,3b\n                                       \
+       .previous"                                              \
+       : "=r" (oldval), "=r" (ret), "+m" (*uaddr)              \
+       : "i" (-EFAULT), "0" (oparg), "1" (0))
+
+#define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg)    \
+  __asm__ __volatile(                                          \
+"1:    movl    %2, %0\n                                        \
+       movl    %0, %3\n"                                       \
+       insn "\n"                                               \
+"2:    " LOCK_PREFIX "cmpxchgl %3, %2\n                        \
+       jnz     1b\n                                            \
+3:     .section .fixup,\"ax\"\n                                \
+4:     mov     %5, %1\n                                        \
+       jmp     3b\n                                            \
+       .previous\n                                             \
+       .section __ex_table,\"a\"\n                             \
+       .align  8\n"                                            \
+       _ASM_PTR "1b,4b,2b,4b\n                                 \
+       .previous"                                              \
+       : "=&a" (oldval), "=&r" (ret), "+m" (*uaddr),           \
+         "=&r" (tem)                                           \
+       : "r" (oparg), "i" (-EFAULT), "1" (0))
+
+static inline int
+futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
+{
+       int op = (encoded_op >> 28) & 7;
+       int cmp = (encoded_op >> 24) & 15;
+       int oparg = (encoded_op << 8) >> 20;
+       int cmparg = (encoded_op << 20) >> 20;
+       int oldval = 0, ret, tem;
+
+       if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
+               oparg = 1 << oparg;
+
+       if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
+               return -EFAULT;
+
+#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_BSWAP)
+       /* Real i386 machines can only support FUTEX_OP_SET */
+       if (op != FUTEX_OP_SET && boot_cpu_data.x86 == 3)
+               return -ENOSYS;
+#endif
+
+       pagefault_disable();
+
+       switch (op) {
+       case FUTEX_OP_SET:
+               __futex_atomic_op1("xchgl %0, %2", ret, oldval, uaddr, oparg);
+               break;
+       case FUTEX_OP_ADD:
+               __futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret, oldval,
+                                  uaddr, oparg);
+               break;
+       case FUTEX_OP_OR:
+               __futex_atomic_op2("orl %4, %3", ret, oldval, uaddr, oparg);
+               break;
+       case FUTEX_OP_ANDN:
+               __futex_atomic_op2("andl %4, %3", ret, oldval, uaddr, ~oparg);
+               break;
+       case FUTEX_OP_XOR:
+               __futex_atomic_op2("xorl %4, %3", ret, oldval, uaddr, oparg);
+               break;
+       default:
+               ret = -ENOSYS;
+       }
+
+       pagefault_enable();
+
+       if (!ret) {
+               switch (cmp) {
+               case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break;
+               case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break;
+               case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break;
+               case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break;
+               case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break;
+               case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break;
+               default: ret = -ENOSYS;
+               }
+       }
+       return ret;
+}
+
+static inline int
+futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
+{
+       if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
+               return -EFAULT;
+
+       __asm__ __volatile__(
+               "1:     " LOCK_PREFIX "cmpxchgl %3, %1          \n"
+
+               "2:     .section .fixup, \"ax\"                 \n"
+               "3:     mov     %2, %0                          \n"
+               "       jmp     2b                              \n"
+               "       .previous                               \n"
+
+               "       .section __ex_table, \"a\"              \n"
+               "       .align  8                               \n"
+                       _ASM_PTR " 1b,3b                        \n"
+               "       .previous                               \n"
+
+               : "=a" (oldval), "+m" (*uaddr)
+               : "i" (-EFAULT), "r" (newval), "0" (oldval)
+               : "memory"
+       );
+
+       return oldval;
+}
+
+#endif
 #endif