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1 /* | |
2 * Copyright (c) 2012 The Native Client Authors. All rights reserved. | |
3 * Use of this source code is governed by a BSD-style license that can be | |
4 * found in the LICENSE file. | |
5 */ | |
6 | |
7 /* | |
8 * This exists only because Windows 64 doesn't support trivial inline assembly. | |
9 * Visual Studio 2010 SP1 has an intrinsic _xgetbv() for this. | |
10 * But earlier versions do not. | |
11 */ | |
12 | |
13 #include "native_client/src/trusted/service_runtime/nacl_config.h" | |
14 | |
15 .text | |
16 | |
17 DEFINE_GLOBAL_HIDDEN_IDENTIFIER(NaClXGETBV): | |
18 #if NACL_BUILD_SUBARCH == 32 | |
19 movl 4(%esp), %ecx | |
20 #elif !NACL_WINDOWS | |
21 movl %edi, %ecx | |
22 #endif | |
23 /* | |
24 * This is "xgetbv" (no operands). Some assemblers don't know it yet. | |
25 */ | |
26 .byte 0x0f, 0x01, 0xd0 | |
27 #if NACL_BUILD_SUBARCH == 64 | |
28 shlq $32, %rdx | |
29 orq %rdx, %rax | |
30 #endif | |
31 ret | |
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