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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 03:01:46 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-06 03:01:46 +0000
commitf8fe689a81f906d1b91bb3220acde2a4ecb14c5b (patch)
tree26484e9d7e2c67806c2d1760196ff01aaa858e8c /src/VBox/Runtime/common/string/bzero.asm
parentInitial commit. (diff)
downloadvirtualbox-upstream.tar.xz
virtualbox-upstream.zip
Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream
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.asm127
1 files changed, 127 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..75423ee5
--- /dev/null
+++ b/src/VBox/Runtime/common/string/bzero.asm
@@ -0,0 +1,127 @@
+; $Id: bzero.asm $
+;; @file
+; IPRT - No-CRT bzero - AMD64 & X86.
+;
+
+;
+; Copyright (C) 2006-2019 Oracle Corporation
+;
+; This file is part of VirtualBox Open Source Edition (OSE), as
+; available from http://www.virtualbox.org. This file is free software;
+; you can redistribute it and/or modify it under the terms of the GNU
+; General Public License (GPL) as published by the Free Software
+; Foundation, in version 2 as it comes in the "COPYING" file of the
+; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+;
+; The contents of this file may alternatively be used under the terms
+; of the Common Development and Distribution License Version 1.0
+; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+; VirtualBox OSE 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.
+;
+
+%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)
+