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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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