VirtualBox

source: vbox/trunk/src/VBox/Runtime/string/memset.asm@ 5285

Last change on this file since 5285 was 4071, checked in by vboxsync, 17 years ago

Biggest check-in ever. New source code headers for all (C) innotek files.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 2.0 KB
Line 
1; $Id: memset.asm 4071 2007-08-07 17:07:59Z vboxsync $
2;; @file
3; innotek Portable Runtime - No-CRT memset - AMD64 & X86.
4;
5
6;
7; Copyright (C) 2006-2007 innotek GmbH
8;
9; This file is part of VirtualBox Open Source Edition (OSE), as
10; available from http://www.virtualbox.org. This file is free software;
11; you can redistribute it and/or modify it under the terms of the GNU
12; General Public License as published by the Free Software Foundation,
13; in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14; distribution. VirtualBox OSE is distributed in the hope that it will
15; be useful, but WITHOUT ANY WARRANTY of any kind.
16
17%include "iprt/asmdefs.mac"
18
19BEGINCODE
20
21;;
22; @param pvDst gcc: rdi msc: ecx x86:[esp+4]
23; @param ch gcc: esi msc: edx x86:[esp+8]
24; @param cb gcc: rdx msc: r8 x86:[esp+0ch]
25BEGINPROC RT_NOCRT(memset)
26 cld
27%ifdef RT_ARCH_AMD64
28 %ifdef ASM_CALL64_MSC
29 int3
30 %error "Port me"
31 %else
32 mov r10, rdi ; the return value.
33 movzx eax, sil
34 cmp rdx, 32
35 jb .dobytes
36
37 ; eax = (al << 24) | (al << 16) | (al << 8) | al;
38 ; rdx = (eax << 32) | eax
39 movzx esi, sil
40 mov rax, qword 0101010101010101h
41 imul rax, rsi
42
43 ; todo: alignment.
44
45 mov rcx, rdx
46 shr rcx, 3
47 rep stosq
48
49 and rdx, 7
50.dobytes:
51 mov rcx, rdx
52 rep stosb
53
54 mov rax, rdi
55 %endif
56
57%else
58 push edi
59
60 mov ecx, [esp + 0ch + 4]
61 movzx eax, byte [esp + 08h + 4]
62 mov edi, [esp + 04h + 4]
63 cmp ecx, 12
64 jb .dobytes
65
66 ; eax = (al << 24) | (al << 16) | (al << 8) | al;
67 mov ah, al
68 mov edx, eax
69 shr edx, 16
70 or eax, edx
71
72 mov edx, ecx
73 shr ecx, 2
74 rep stosd
75
76 and edx, 3
77 mov ecx, edx
78.dobytes:
79 rep stosb
80
81 pop edi
82 mov eax, [esp + 4]
83%endif
84 ret
85ENDPROC RT_NOCRT(memset)
86
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