diff options
| author | PikalaxALT <pikalaxalt@gmail.com> | 2017-12-15 09:38:53 -0500 |
|---|---|---|
| committer | PikalaxALT <pikalaxalt@gmail.com> | 2017-12-15 09:39:34 -0500 |
| commit | f95a4a932476be2ba99e2fd081e8d2bc6ea12813 (patch) | |
| tree | 75f67192cb2d7b7b575c94edda318e475239b63c /newlib/libc/machine/i386/memcpy.S | |
| parent | f60aca96985e68c7d8a52eb7bc955fb80e132f73 (diff) | |
Import newlib and create makefile
Diffstat (limited to 'newlib/libc/machine/i386/memcpy.S')
| -rw-r--r-- | newlib/libc/machine/i386/memcpy.S | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/newlib/libc/machine/i386/memcpy.S b/newlib/libc/machine/i386/memcpy.S new file mode 100644 index 0000000..bf1dd6b --- /dev/null +++ b/newlib/libc/machine/i386/memcpy.S @@ -0,0 +1,58 @@ +/* + * ==================================================== + * Copyright (C) 1998 by Cygnus Solutions. All rights reserved. + * + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + + #include "i386mach.h" + + .global SYM (memcpy) + +SYM (memcpy): + + pushl ebp + movl esp,ebp + subl $16,esp + pushl edi + pushl esi + movl 8(ebp),edi + movl 12(ebp),esi + movl 16(ebp),ecx + cld + +#ifndef __OPTIMIZE_SIZE__ +/* if aligned on long boundary, move doublewords at a time first */ + + movl edi,eax + orl esi,eax + testb $3,al + jne BYTEMOVE + shrl $2,ecx + rep + movsl + +/* calculate any remainder bytes after moving doublewords */ + + movl 16(ebp),ecx + andl $3,ecx +#endif /* not __OPTIMIZE_SIZE__ */ + +/* move any unaligned bytes or remainder bytes, one at a time */ + +BYTEMOVE: + rep + movsb + +/* return destination address */ + + movl 8(ebp),eax + + leal -24(ebp),esp + popl esi + popl edi + leave + ret |