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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:17:27 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:17:27 +0000 |
commit | f215e02bf85f68d3a6106c2a1f4f7f063f819064 (patch) | |
tree | 6bb5b92c046312c4e95ac2620b10ddf482d3fa8b /src/VBox/Runtime/common/string/bzero.asm | |
parent | Initial commit. (diff) | |
download | virtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.tar.xz virtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.zip |
Adding upstream version 7.0.14-dfsg.upstream/7.0.14-dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/VBox/Runtime/common/string/bzero.asm')
-rw-r--r-- | src/VBox/Runtime/common/string/bzero.asm | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/string/bzero.asm b/src/VBox/Runtime/common/string/bzero.asm new file mode 100644 index 00000000..15ed85ab --- /dev/null +++ b/src/VBox/Runtime/common/string/bzero.asm @@ -0,0 +1,137 @@ +; $Id: bzero.asm $ +;; @file +; IPRT - No-CRT bzero - AMD64 & X86. +; + +; +; Copyright (C) 2006-2023 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 +; + +%include "iprt/asmdefs.mac" + +BEGINCODE + +;; +; @param pvDst gcc: rdi msc: rcx x86:[esp+4] wcall:eax +; @param cb gcc: rsi msc: rdx x86:[esp+8] wcall:edx +RT_NOCRT_BEGINPROC bzero +%ifdef RT_OS_DARWIN +GLOBALNAME __bzero +%endif + cld +%ifdef RT_ARCH_AMD64 + xor eax, eax + %ifdef ASM_CALL64_MSC + mov r9, rdi ; save rdi in r9 + mov rdi, rcx + + ; todo: alignment? + mov rcx, rdx + shr rcx, 3 + rep stosq + + and rdx, 7 + mov rcx, rdx + rep stosb + + mov rdi, r9 ; restore rdi + + %else ; GCC + ; todo: alignment? + mov rcx, rsi + shr rcx, 3 + rep stosq + + and rsi, 7 + mov rcx, rsi + rep stosb + + %endif ; GCC + +%elif ARCH_BITS == 32 + push ebp + mov ebp, esp + push edi + + %ifdef ASM_CALL32_WATCOM + mov ecx, edx + mov edi, eax + %else + mov ecx, [ebp + 0ch] + mov edi, [ebp + 08h] + %endif + xor eax, eax + + mov edx, ecx + shr ecx, 2 + rep stosd + + and edx, 3 + mov ecx, edx + rep stosb + + pop edi + leave + +%elif ARCH_BITS == 16 + push bp + mov bp, sp + push di + + mov cx, [bp + 0ch] + mov di, [bp + 08h] + xor ax, ax + + ; align di. + test di, 1 + jz .aligned + jcxz .done + stosb + dec cx + jz .done + +.aligned: + mov dx, cx + shr cx, 1 + rep stosw + + test dl, 1 + jz .done + stosb + +.done: + pop di + pop bp +%else + %error ARCH_BITS +%endif ; X86 + ret +ENDPROC RT_NOCRT(bzero) + |