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Diffstat (limited to 'src/VBox/Runtime/common/math/fedisableexcept.asm')
| -rw-r--r-- | src/VBox/Runtime/common/math/fedisableexcept.asm | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/math/fedisableexcept.asm b/src/VBox/Runtime/common/math/fedisableexcept.asm new file mode 100644 index 00000000..3fb339c3 --- /dev/null +++ b/src/VBox/Runtime/common/math/fedisableexcept.asm @@ -0,0 +1,117 @@ +; $Id: fedisableexcept.asm $ +;; @file +; IPRT - No-CRT fedisableexcept - AMD64 & X86. +; + +; +; Copyright (C) 2022-2023 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 + +;; +; Enables a set of exceptions (BSD/GNU extension). +; +; @returns eax = Previous enabled exceptions on success (not subject to fXcpt), +; -1 on failure. +; @param fXcpt 32-bit: [xBP+8]; msc64: ecx; gcc64: edi; -- Mask of exceptions to disable. +; +RT_NOCRT_BEGINPROC fedisableexcept + 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. + ; +%ifdef ASM_CALL64_GCC + mov ecx, edi +%elifdef RT_ARCH_X86 + mov ecx, [xBP + xCB*2] +%endif + or eax, -1 + test ecx, ~X86_FCW_XCPT_MASK +%ifndef RT_STRICT + jnz .return +%else + jz .input_ok + int3 + jmp .return +.input_ok: +%endif + + ; + ; Make the changes (old mask in eax). + ; + + ; Modify the x87 mask first (ecx preserved). + fstcw [xBP - 10h] +%ifdef RT_ARCH_X86 ; Return the inverted x87 mask in 32-bit mode. + movzx eax, word [xBP - 10h] +%endif + or word [xBP - 10h], cx + fldcw [xBP - 10h] + +%ifdef RT_ARCH_X86 + ; SSE supported (ecx preserved)? + extern NAME(rtNoCrtHasSse) + call NAME(rtNoCrtHasSse) + test al, al + jz .return_ok +%endif + + ; Modify the SSE mask (modifies ecx). + stmxcsr [xBP - 10h] +%ifdef RT_ARCH_AMD64 ; Return the inverted MXCSR exception mask on AMD64 because windows doesn't necessarily set the x87 one. + mov eax, [xBP - 10h] + shr eax, X86_MXCSR_XCPT_MASK_SHIFT +%endif + shl ecx, X86_MXCSR_XCPT_MASK_SHIFT + or [xBP - 10h], ecx + ldmxcsr [xBP - 10h] + +.return_ok: + not eax ; Invert it as we return the enabled rather than masked exceptions. + and eax, X86_FCW_XCPT_MASK +.return: + leave + ret +ENDPROC RT_NOCRT(fedisableexcept) + |