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author | Sebastian Schmelzer | 2010-10-25 16:53:54 +0200 |
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committer | Sebastian Schmelzer | 2010-10-25 16:53:54 +0200 |
commit | 3050a9253437f4a4b5ad4bf3b3efdc3c660a5137 (patch) | |
tree | 91ac22153e416aac7ca20916b314b5e2ffa871b1 /contrib/syslinux-4.02/com32/lib/mempcpy.S | |
download | preboot-3050a9253437f4a4b5ad4bf3b3efdc3c660a5137.tar.gz preboot-3050a9253437f4a4b5ad4bf3b3efdc3c660a5137.tar.xz preboot-3050a9253437f4a4b5ad4bf3b3efdc3c660a5137.zip |
Diffstat (limited to 'contrib/syslinux-4.02/com32/lib/mempcpy.S')
-rw-r--r-- | contrib/syslinux-4.02/com32/lib/mempcpy.S | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/lib/mempcpy.S b/contrib/syslinux-4.02/com32/lib/mempcpy.S new file mode 100644 index 0000000..cad7b98 --- /dev/null +++ b/contrib/syslinux-4.02/com32/lib/mempcpy.S @@ -0,0 +1,85 @@ +/* ----------------------------------------------------------------------- * + * + * Copyright 2008 H. Peter Anvin - All Rights Reserved + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, + * copy, modify, merge, publish, distribute, sublicense, and/or + * sell copies of the Software, and to permit persons to whom + * the Software is furnished to do so, subject to the following + * conditions: + * + * The above copyright notice and this permission notice shall + * be included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES + * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT + * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * ----------------------------------------------------------------------- */ + +/* + * mempcpy.S + * + * Reasonably efficient mempcpy, using aligned transfers at least + * for the destination operand. + */ + + .text + .globl mempcpy + .type mempcpy, @function +mempcpy: + jecxz 1f + + pushl %esi + pushl %edi + + movl %eax,%edi + movl %edx,%esi + + /* Initial alignment */ + movl %edi,%edx + shrl $1,%edx + jnc 11f + movsb + decl %ecx +11: + movb %cl,%al + cmpl $2,%ecx + jb 13f + + shrl $1,%edx + jnc 12f + movsw + subl $2,%ecx +12: + /* Bulk transfer */ + movb %cl,%al + shrl $2,%ecx + rep; movsl + + /* Final alignment */ + testb $2,%al + jz 14f + movsw +13: +14: + testb $1,%al + jz 15f + movsb +15: + + movl %edi,%eax /* Return value */ + popl %edi + popl %esi +1: + ret + + .size mempcpy, .-mempcpy |