17c478bd9Sstevel@tonic-gate/* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 57257d1b4Sraf * Common Development and Distribution License (the "License"). 67257d1b4Sraf * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 217257d1b4Sraf 227c478bd9Sstevel@tonic-gate/* 237257d1b4Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 247c478bd9Sstevel@tonic-gate * Use is subject to license terms. 257c478bd9Sstevel@tonic-gate */ 267c478bd9Sstevel@tonic-gate 27*9a70fc3bSMark J. Nelson .file "wsncmp.s" 287c478bd9Sstevel@tonic-gate 297c478bd9Sstevel@tonic-gate/ 307c478bd9Sstevel@tonic-gate/ Wide character wcsncpy() implementation 317c478bd9Sstevel@tonic-gate/ 327c478bd9Sstevel@tonic-gate/ Algorithm based on Solaris 2.6 gen/strncpy.s implementation 337c478bd9Sstevel@tonic-gate/ 347c478bd9Sstevel@tonic-gate 357c478bd9Sstevel@tonic-gate#include <sys/asm_linkage.h> 367c478bd9Sstevel@tonic-gate 377c478bd9Sstevel@tonic-gate ANSI_PRAGMA_WEAK(wcsncmp,function) 387c478bd9Sstevel@tonic-gate ANSI_PRAGMA_WEAK(wsncmp,function) 397c478bd9Sstevel@tonic-gate 407257d1b4Sraf ENTRY(wcsncmp) /* (wchar *ws1, wchar_t *ws2, size_t n) */ 417c478bd9Sstevel@tonic-gate cmpq %rdi,%rsi / same string? 427c478bd9Sstevel@tonic-gate je .equal 437c478bd9Sstevel@tonic-gate incq %rdx / will later predecrement this uint 447c478bd9Sstevel@tonic-gate.loop: 457c478bd9Sstevel@tonic-gate decq %rdx 467c478bd9Sstevel@tonic-gate je .equal / Used all n chars? 477c478bd9Sstevel@tonic-gate movl (%rdi),%eax / slodb ; scab 487c478bd9Sstevel@tonic-gate cmpl (%rsi),%eax 497c478bd9Sstevel@tonic-gate jne .notequal_0 / Are the bytes equal? 507c478bd9Sstevel@tonic-gate testl %eax,%eax 517c478bd9Sstevel@tonic-gate je .equal / End of string? 527c478bd9Sstevel@tonic-gate 537c478bd9Sstevel@tonic-gate decq %rdx 547c478bd9Sstevel@tonic-gate je .equal / Used all n chars? 557c478bd9Sstevel@tonic-gate movl 4(%rdi),%eax / slodb ; scab 567c478bd9Sstevel@tonic-gate cmpl 4(%rsi),%eax 577c478bd9Sstevel@tonic-gate jne .notequal_1 / Are the bytes equal? 587c478bd9Sstevel@tonic-gate testl %eax,%eax 597c478bd9Sstevel@tonic-gate je .equal / End of string? 607c478bd9Sstevel@tonic-gate 617c478bd9Sstevel@tonic-gate decq %rdx 627c478bd9Sstevel@tonic-gate je .equal / Used all n chars? 637c478bd9Sstevel@tonic-gate movl 8(%rdi),%eax / slodb ; scab 647c478bd9Sstevel@tonic-gate cmpl 8(%rsi),%eax 657c478bd9Sstevel@tonic-gate jne .notequal_2 / Are the bytes equal? 667c478bd9Sstevel@tonic-gate testl %eax,%eax 677c478bd9Sstevel@tonic-gate je .equal / End of string? 687c478bd9Sstevel@tonic-gate 697c478bd9Sstevel@tonic-gate decq %rdx 707c478bd9Sstevel@tonic-gate je .equal / Used all n chars? 717c478bd9Sstevel@tonic-gate movl 12(%rdi),%eax / slodb ; scab 727c478bd9Sstevel@tonic-gate cmpl 12(%rsi),%eax 737c478bd9Sstevel@tonic-gate jne .notequal_3 / Are the bytes equal? 747c478bd9Sstevel@tonic-gate addq $16,%rdi 757c478bd9Sstevel@tonic-gate addq $16,%rsi 767c478bd9Sstevel@tonic-gate testl %eax,%eax 777c478bd9Sstevel@tonic-gate jne .loop / End of string? 787c478bd9Sstevel@tonic-gate 797c478bd9Sstevel@tonic-gate.equal: 807c478bd9Sstevel@tonic-gate xorl %eax,%eax / return 0 817c478bd9Sstevel@tonic-gate ret 827c478bd9Sstevel@tonic-gate 837c478bd9Sstevel@tonic-gate .align 4 847c478bd9Sstevel@tonic-gate.notequal_3: 857c478bd9Sstevel@tonic-gate addq $4,%rsi 867c478bd9Sstevel@tonic-gate.notequal_2: 877c478bd9Sstevel@tonic-gate addq $4,%rsi 887c478bd9Sstevel@tonic-gate.notequal_1: 897c478bd9Sstevel@tonic-gate addq $4,%rsi 907c478bd9Sstevel@tonic-gate.notequal_0: 917c478bd9Sstevel@tonic-gate subl (%rsi),%eax / return value is (*s1 - *--s2) 927c478bd9Sstevel@tonic-gate ret 937257d1b4Sraf SET_SIZE(wcsncmp) 947c478bd9Sstevel@tonic-gate 957257d1b4Sraf ENTRY(wsncmp) 967257d1b4Sraf jmp wcsncmp / tail call into wcsncmp 977257d1b4Sraf SET_SIZE(wsncmp) 98