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Diffstat (limited to '')
-rw-r--r-- | src/VBox/Runtime/common/asm/ASMAtomicUoDecU32.asm | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/asm/ASMAtomicUoDecU32.asm b/src/VBox/Runtime/common/asm/ASMAtomicUoDecU32.asm new file mode 100644 index 00000000..469bc69f --- /dev/null +++ b/src/VBox/Runtime/common/asm/ASMAtomicUoDecU32.asm @@ -0,0 +1,66 @@ +; $Id: ASMAtomicUoDecU32.asm $ +;; @file +; IPRT - ASMAtomicUoDecU32(). +; + +; +; Copyright (C) 2014-2023 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 +; + +;******************************************************************************* +;* Header Files * +;******************************************************************************* +%include "iprt/asmdefs.mac" + +BEGINCODE + +;; +; Atomically decrement an unsigned 32-bit value, unordered. +; +; @param pu32 x86:esp+4 gcc:rdi msc:rcx + +; @returns the new decremented value. +; +RT_BEGINPROC ASMAtomicUoDecU32 + mov eax, -1 +%ifdef RT_ARCH_AMD64 + %ifdef ASM_CALL64_MSC + xadd [rcx], eax + %else + xadd [rdi], eax + %endif +%elifdef RT_ARCH_X86 + mov ecx, [esp + 04h] + xadd [ecx], eax +%endif + dec eax + ret +ENDPROC ASMAtomicUoDecU32 + |