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|
; $Id$
;; @file
; IPRT - No-CRT feclearexcept - AMD64 & X86.
;
;
; Copyright (C) 2022 Oracle and/or its affiliates.
;
; This file is part of VirtualBox base platform packages, as
; available from https://www.virtualbox.org.
;
; This program is free software; you can redistribute it and/or
; modify it under the terms of the GNU General Public License
; as published by the Free Software Foundation, in version 3 of the
; License.
;
; This program is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, see <https://www.gnu.org/licenses>.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
; in the VirtualBox distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
;
%define RT_ASM_WITH_SEH64
%include "iprt/asmdefs.mac"
%include "iprt/x86.mac"
BEGINCODE
;;
; Sets the hardware rounding mode.
;
; @returns eax = 0 on success, non-zero on failure.
; @param fXcpts 32-bit: [xBP+8]; msc64: ecx; gcc64: edi; -- Zero or more bits from X86_FSW_XCPT_MASK
;
RT_NOCRT_BEGINPROC feclearexcept
push xBP
SEH64_PUSH_xBP
mov xBP, xSP
SEH64_SET_FRAME_xBP 0
sub xSP, 20h
SEH64_ALLOCATE_STACK 20h
SEH64_END_PROLOGUE
;
; Load the parameter into ecx, validate and adjust it.
;
%ifdef ASM_CALL64_GCC
mov ecx, edi
%elifdef RT_ARCH_X86
mov ecx, [xBP + xCB*2]
%endif
%if 0
and ecx, X86_FSW_XCPT_MASK
%else
or eax, -1
test ecx, ~X86_FSW_XCPT_MASK
jnz .return
%endif
; #IE implies #SF
mov al, cl
and al, X86_FSW_IE
shl al, X86_FSW_SF_BIT - X86_FSW_IE_BIT
or cl, al
; Make it into and AND mask suitable for clearing the specified exceptions.
not ecx
;
; Make the changes.
;
; Modify the x87 flags first (ecx preserved).
cmp ecx, ~X86_FSW_XCPT_MASK ; This includes all the x87 exceptions, including stack error.
jne .partial_mask
fnclex
jmp .do_sse
.partial_mask:
fnstenv [xBP - 20h]
and word [xBP - 20h + 4], cx ; The FCW is at offset 4 in the 32-bit prot mode layout
fldenv [xBP - 20h] ; Recalculates the FSW.ES flag.
.do_sse:
%ifdef RT_ARCH_X86
; SSE supported (ecx preserved)?
extern NAME(rtNoCrtHasSse)
call NAME(rtNoCrtHasSse)
test al, al
jz .return_ok
%endif
; Modify the SSE flags (modifies ecx).
stmxcsr [xBP - 10h]
or ecx, X86_FSW_XCPT_MASK & ~X86_MXCSR_XCPT_FLAGS ; Don't mix X86_FSW_SF with X86_MXCSR_DAZ.
and [xBP - 10h], ecx
ldmxcsr [xBP - 10h]
.return_ok:
xor eax, eax
.return:
leave
ret
ENDPROC RT_NOCRT(feclearexcept)
|
