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73 lines
2.5 KiB
ArmAsm
73 lines
2.5 KiB
ArmAsm
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* PURPOSE: Run-Time Library
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* FILE: lib/rtl/i386/ftol.S
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* PROGRAMER: Alex Ionescu (alex@relsoft.net)
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*
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* Copyright (C) 2002 Michael Ringgaard.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES// LOSS OF USE, DATA, OR PROFITS// OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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.globl __ftol
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.intel_syntax noprefix
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/* FUNCTIONS ***************************************************************/
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/*
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* This routine is called by MSVC-generated code to convert from floating point
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* to integer representation. The floating point number to be converted is
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* on the top of the floating point stack.
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*/
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__ftol:
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/* Set up stack frame */
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push ebp
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mov ebp, esp
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/* Set "round towards zero" mode */
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fstcw [ebp-2]
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wait
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mov ax, [ebp-2]
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or ah, 0xC
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mov [ebp-4], ax
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fldcw [ebp-4]
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/* Do the conversion */
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fistp qword ptr [ebp-12]
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/* Restore rounding mode */
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fldcw [ebp-2]
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/* Return value */
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mov eax, [ebp-12]
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mov edx, [ebp-8]
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/* Remove stack frame and return*/
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leave
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ret
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