Adding upstream version 7.0.6-dfsg.upstream/7.0.6-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 88 insertions, 0 deletions

diff --git a/src/VBox/Runtime/common/math/fesetx87precision.asm b/src/VBox/Runtime/common/math/fesetx87precision.asm
new file mode 100644
index 00000000..8fb63f4a
--- /dev/null
+++ b/src/VBox/Runtime/common/math/fesetx87precision.asm
@@ -0,0 +1,88 @@
+; $Id: fesetx87precision.asm $
+;; @file
+; IPRT - No-CRT fesetx87precision - 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 x87 hardware precision mode - IPRT extension.
+;
+; @returns  eax = previous precision mode, -1 on failure.
+; @param    iPrecisionMode  32-bit: [xBP+8]     msc64: ecx      gcc64: edi
+;
+RT_NOCRT_BEGINPROC fesetx87precision
+        push    xBP
+        SEH64_PUSH_xBP
+        mov     xBP, xSP
+        SEH64_SET_FRAME_xBP 0
+        sub     xSP, 10h
+        SEH64_ALLOCATE_STACK 10h
+        SEH64_END_PROLOGUE
+
+        ;
+        ; Load the parameter into ecx.
+        ;
+        or      eax, -1
+%ifdef ASM_CALL64_GCC
+        mov     ecx, edi
+%elifdef RT_ARCH_X86
+        mov     ecx, [xBP + xCB*2]
+%endif
+        test    ecx, ~X86_FCW_PC_MASK
+        jnz     .return
+
+        ;
+        ; Extract the current from the x87 FCW.
+        ;
+        fnstcw  [xBP - 10h]
+        mov     dx, [xBP - 10h]
+        mov     ax, dx
+        and     dx, ~X86_FCW_PC_MASK
+        or      dx, cx
+        mov     [xBP - 10h], dx
+        fldcw   [xBP - 10h]
+
+        and     eax, X86_FCW_PC_MASK
+.return:
+        leave
+        ret
+ENDPROC   RT_NOCRT(fesetx87precision)
+