1/* 2 * COPYRIGHT: See COPYING in the top level directory 3 * PROJECT: ReactOS kernel 4 * PURPOSE: Run-Time Library 5 * FILE: lib/sdk/crt/math/i386/ftol_asm.s 6 * PROGRAMER: Alex Ionescu (alex@relsoft.net) 7 * 8 * Copyright (C) 2002 Michael Ringgaard. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the project nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES// LOSS OF USE, DATA, OR PROFITS// OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#include <asm.inc> 38 39PUBLIC __ftol 40 41/* FUNCTIONS ***************************************************************/ 42.code 43 44/* 45 * This routine is called by MSVC-generated code to convert from floating point 46 * to integer representation. The floating point number to be converted is 47 * on the top of the floating point stack. 48 */ 49__ftol: 50 /* Set up stack frame */ 51 push ebp 52 mov ebp, esp 53 54 /* Set "round towards zero" mode */ 55 fstcw [ebp-2] 56 wait 57 mov ax, [ebp-2] 58 or ah, 12 59 mov [ebp-4], ax 60 fldcw [ebp-4] 61 62 /* Do the conversion */ 63 fistp qword ptr [ebp-12] 64 65 /* Restore rounding mode */ 66 fldcw [ebp-2] 67 68 /* Return value */ 69 mov eax, [ebp-12] 70 mov edx, [ebp-8] 71 72 /* Remove stack frame and return*/ 73 leave 74 ret 75 76END 77