1 /* $OpenBSD: strcpy.S,v 1.8 2005/08/07 11:30:38 espie Exp $ */ 2 /* 3 * Written by J.T. Conklin <jtc (at) netbsd.org>. 4 * Public domain. 5 */ 6 7 #include <machine/asm.h> 8 9 #if defined(APIWARN) 10 #APP 11 .section .gnu.warning.strcpy 12 .ascii "warning: strcpy() is almost always misused, please use strlcpy()" 13 #NO_APP 14 #endif 15 16 /* 17 * NOTE: I've unrolled the loop eight times: large enough to make a 18 * significant difference, and small enough not to totally trash the 19 * cache. 20 */ 21 22 ENTRY(strcpy) 23 movl 4(%esp),%ecx /* dst address */ 24 movl 8(%esp),%edx /* src address */ 25 pushl %ecx /* push dst address */ 26 27 .align 2,0x90 28 L1: movb (%edx),%al /* unroll loop, but not too much */ 29 movb %al,(%ecx) 30 testb %al,%al 31 jz L2 32 movb 1(%edx),%al 33 movb %al,1(%ecx) 34 testb %al,%al 35 jz L2 36 movb 2(%edx),%al 37 movb %al,2(%ecx) 38 testb %al,%al 39 jz L2 40 movb 3(%edx),%al 41 movb %al,3(%ecx) 42 testb %al,%al 43 jz L2 44 movb 4(%edx),%al 45 movb %al,4(%ecx) 46 testb %al,%al 47 jz L2 48 movb 5(%edx),%al 49 movb %al,5(%ecx) 50 testb %al,%al 51 jz L2 52 movb 6(%edx),%al 53 movb %al,6(%ecx) 54 testb %al,%al 55 jz L2 56 movb 7(%edx),%al 57 movb %al,7(%ecx) 58 addl $8,%edx 59 addl $8,%ecx 60 testb %al,%al 61 jnz L1 62 L2: popl %eax /* pop dst address */ 63 ret 64
