VirtualBox

source: vbox/trunk/src/VBox/Runtime/common/string/bzero.asm@ 96563

Last change on this file since 96563 was 96407, checked in by vboxsync, 2 years ago

scm copyright and license note update

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 3.1 KB
Line 
1; $Id: bzero.asm 96407 2022-08-22 17:43:14Z vboxsync $
2;; @file
3; IPRT - No-CRT bzero - AMD64 & X86.
4;
5
6;
7; Copyright (C) 2006-2022 Oracle and/or its affiliates.
8;
9; This file is part of VirtualBox base platform packages, as
10; available from https://www.virtualbox.org.
11;
12; This program is free software; you can redistribute it and/or
13; modify it under the terms of the GNU General Public License
14; as published by the Free Software Foundation, in version 3 of the
15; License.
16;
17; This program is distributed in the hope that it will be useful, but
18; WITHOUT ANY WARRANTY; without even the implied warranty of
19; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20; General Public License for more details.
21;
22; You should have received a copy of the GNU General Public License
23; along with this program; if not, see <https://www.gnu.org/licenses>.
24;
25; The contents of this file may alternatively be used under the terms
26; of the Common Development and Distribution License Version 1.0
27; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28; in the VirtualBox distribution, in which case the provisions of the
29; CDDL are applicable instead of those of the GPL.
30;
31; You may elect to license modified versions of this file under the
32; terms and conditions of either the GPL or the CDDL or both.
33;
34; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35;
36
37%include "iprt/asmdefs.mac"
38
39BEGINCODE
40
41;;
42; @param pvDst gcc: rdi msc: rcx x86:[esp+4] wcall:eax
43; @param cb gcc: rsi msc: rdx x86:[esp+8] wcall:edx
44RT_NOCRT_BEGINPROC bzero
45%ifdef RT_OS_DARWIN
46GLOBALNAME __bzero
47%endif
48 cld
49%ifdef RT_ARCH_AMD64
50 xor eax, eax
51 %ifdef ASM_CALL64_MSC
52 mov r9, rdi ; save rdi in r9
53 mov rdi, rcx
54
55 ; todo: alignment?
56 mov rcx, rdx
57 shr rcx, 3
58 rep stosq
59
60 and rdx, 7
61 mov rcx, rdx
62 rep stosb
63
64 mov rdi, r9 ; restore rdi
65
66 %else ; GCC
67 ; todo: alignment?
68 mov rcx, rsi
69 shr rcx, 3
70 rep stosq
71
72 and rsi, 7
73 mov rcx, rsi
74 rep stosb
75
76 %endif ; GCC
77
78%elif ARCH_BITS == 32
79 push ebp
80 mov ebp, esp
81 push edi
82
83 %ifdef ASM_CALL32_WATCOM
84 mov ecx, edx
85 mov edi, eax
86 %else
87 mov ecx, [ebp + 0ch]
88 mov edi, [ebp + 08h]
89 %endif
90 xor eax, eax
91
92 mov edx, ecx
93 shr ecx, 2
94 rep stosd
95
96 and edx, 3
97 mov ecx, edx
98 rep stosb
99
100 pop edi
101 leave
102
103%elif ARCH_BITS == 16
104 push bp
105 mov bp, sp
106 push di
107
108 mov cx, [bp + 0ch]
109 mov di, [bp + 08h]
110 xor ax, ax
111
112 ; align di.
113 test di, 1
114 jz .aligned
115 jcxz .done
116 stosb
117 dec cx
118 jz .done
119
120.aligned:
121 mov dx, cx
122 shr cx, 1
123 rep stosw
124
125 test dl, 1
126 jz .done
127 stosb
128
129.done:
130 pop di
131 pop bp
132%else
133 %error ARCH_BITS
134%endif ; X86
135 ret
136ENDPROC RT_NOCRT(bzero)
137
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