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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 03:01:46 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 03:01:46 +0000 |
commit | f8fe689a81f906d1b91bb3220acde2a4ecb14c5b (patch) | |
tree | 26484e9d7e2c67806c2d1760196ff01aaa858e8c /src/VBox/Runtime/common/string/strncpy.asm | |
parent | Initial commit. (diff) | |
download | virtualbox-f8fe689a81f906d1b91bb3220acde2a4ecb14c5b.tar.xz virtualbox-f8fe689a81f906d1b91bb3220acde2a4ecb14c5b.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 '')
-rw-r--r-- | src/VBox/Runtime/common/string/strncpy.asm | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/string/strncpy.asm b/src/VBox/Runtime/common/string/strncpy.asm new file mode 100644 index 00000000..4e8533df --- /dev/null +++ b/src/VBox/Runtime/common/string/strncpy.asm @@ -0,0 +1,129 @@ +; $Id: strncpy.asm $ +;; @file +; IPRT - No-CRT strncpy - 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 pszDst gcc: rdi msc: rcx x86:[esp+4] wcall: eax +; @param pszSrc gcc: rsi msc: rdx x86:[esp+8] wcall: edx +; @param cbMax gcc: rdx msc: r8 x86:[esp+12] wcall: ebx +RT_NOCRT_BEGINPROC strncpy + ; input +%ifdef RT_ARCH_AMD64 + %ifdef ASM_CALL64_MSC + %define pszDst rcx + %define pszSrc rdx + %define cbMax r8 + %else + %define pszDst rdi + %define pszSrc rsi + %define cbMax rdx + %endif + mov r9, pszDst +%else + %ifdef ASM_CALL32_WATCOM + mov ecx, eax + %define pszDst ecx + %define pszSrc edx + %define cbMax ebx + %else + mov ecx, [esp + 4] + mov edx, [esp + 8] + push ebx + mov ebx, [esp + 12 + 4] + %define pszDst ecx + %define pszSrc edx + %define cbMax ebx + %endif + push pszDst +%endif + + ; + ; The rolled out loop. + ; +.next: + cmp cbMax, 4 + jb .simple_intro + + mov al, [pszSrc] + mov [pszDst], al + test al, al + jz .done + + mov al, [pszSrc + 1] + mov [pszDst + 1], al + test al, al + jz .done + + mov al, [pszSrc + 2] + mov [pszDst + 2], al + test al, al + jz .done + + mov al, [pszSrc + 3] + mov [pszDst + 3], al + test al, al + jz .done + + add pszDst, 4 + add pszSrc, 4 + sub cbMax, 4 + jmp .next + + ; + ; Char by char. + ; +.simple_intro: + test cbMax, cbMax + jz .done + +.simple_next: + mov al, [pszSrc] + mov [pszDst], al + test al, al + jz .done + + dec cbMax + jz .done + + inc pszSrc + inc pszDst + jmp .simple_next + +.done: +%ifdef RT_ARCH_AMD64 + mov rax, r9 +%else + %ifndef ASM_CALL32_WATCOM + pop ebx + %endif + pop eax +%endif + ret +ENDPROC RT_NOCRT(strncpy) + |