summaryrefslogtreecommitdiffstats
path: root/src/VBox/Runtime/common/string/mempcpy.asm
diff options
context:
space:
mode:
Diffstat (limited to 'src/VBox/Runtime/common/string/mempcpy.asm')
-rw-r--r--src/VBox/Runtime/common/string/mempcpy.asm110
1 files changed, 110 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/string/mempcpy.asm b/src/VBox/Runtime/common/string/mempcpy.asm
new file mode 100644
index 00000000..a6428391
--- /dev/null
+++ b/src/VBox/Runtime/common/string/mempcpy.asm
@@ -0,0 +1,110 @@
+; $Id: mempcpy.asm $
+;; @file
+; IPRT - No-CRT mempcpy - 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 pvSrc gcc: rsi msc: rdx x86:[esp+8] wcall: edx
+; @param cb gcc: rdx msc: r8 x86:[esp+0ch] wcall: ebx
+RT_NOCRT_BEGINPROC mempcpy
+ cld ; paranoia
+
+ ; Do the bulk of the work.
+%ifdef RT_ARCH_AMD64
+ %ifdef ASM_CALL64_MSC
+ mov r10, rdi ; save
+ mov r11, rsi ; save
+ mov rdi, rcx
+ mov rsi, rdx
+ mov rcx, r8
+ mov rdx, r8
+ %else
+ mov rcx, rdx
+ %endif
+ shr rcx, 3
+ rep movsq
+%else
+ %ifdef ASM_CALL32_WATCOM
+ xchg eax, edi ; saving edi in eax and loading it
+ push esi
+ mov esi, edx
+ mov ecx, ebx
+ mov edx, ebx
+ %else
+ mov eax, edi ; saving edi in eax
+ push esi
+ mov ecx, [esp + 0ch + 4]
+ mov edi, [esp + 04h + 4]
+ mov esi, [esp + 08h + 4]
+ mov edx, ecx
+ %endif
+ shr ecx, 2
+ rep movsd
+%endif
+
+ ; The remaining bytes.
+%ifdef RT_ARCH_AMD64
+ test dl, 4
+ jz .dont_move_dword
+ movsd
+%endif
+.dont_move_dword:
+ test dl, 2
+ jz .dont_move_word
+ movsw
+.dont_move_word:
+ test dl, 1
+ jz .dont_move_byte
+ movsb
+.dont_move_byte:
+
+ ; restore & return
+%ifdef RT_ARCH_AMD64
+ mov rax, rdi
+ %ifdef ASM_CALL64_MSC
+ mov rsi, r11
+ mov rdi, r10
+ %endif
+%else
+ pop esi
+ xchg eax, edi
+%endif
+ ret
+ENDPROC RT_NOCRT(mempcpy)
+