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 279a70fc3bSMark J. Nelson .file "strlcpy.s" 287c478bd9Sstevel@tonic-gate/* 297c478bd9Sstevel@tonic-gate * The strlcpy() function copies at most dstsize-1 characters 307c478bd9Sstevel@tonic-gate * (dstsize being the size of the string buffer dst) from src 317c478bd9Sstevel@tonic-gate * to dst, truncating src if necessary. The result is always 327c478bd9Sstevel@tonic-gate * null-terminated. The function returns strlen(src). Buffer 337c478bd9Sstevel@tonic-gate * overflow can be checked as follows: 347c478bd9Sstevel@tonic-gate * 357c478bd9Sstevel@tonic-gate * if (strlcpy(dst, src, dstsize) >= dstsize) 367c478bd9Sstevel@tonic-gate * return -1; 377c478bd9Sstevel@tonic-gate */ 387c478bd9Sstevel@tonic-gate 397c478bd9Sstevel@tonic-gate#include <sys/asm_linkage.h> 407c478bd9Sstevel@tonic-gate 417c478bd9Sstevel@tonic-gate ! strlcpy implementation is similar to that of strcpy, except 427c478bd9Sstevel@tonic-gate ! in this case, the maximum size of the detination must be 437c478bd9Sstevel@tonic-gate ! tracked since it bounds our maximum copy size. However, 447c478bd9Sstevel@tonic-gate ! we must still continue to check for zero since the routine 457c478bd9Sstevel@tonic-gate ! is expected to null-terminate any string that is within 467c478bd9Sstevel@tonic-gate ! the dest size bound. 477c478bd9Sstevel@tonic-gate ! 487c478bd9Sstevel@tonic-gate ! this method starts by checking for and arranging source alignment. 497c478bd9Sstevel@tonic-gate ! Once this has occurred, we copy based upon destination alignment. 507c478bd9Sstevel@tonic-gate ! This is either by word, halfword, or byte. As this occurs, we 517c478bd9Sstevel@tonic-gate ! check for a zero-byte. If one is found, we branch to a method 52*55fea89dSDan Cross ! which checks for the exact location of a zero-byte within a 537c478bd9Sstevel@tonic-gate ! larger word/half-word quantity. 547c478bd9Sstevel@tonic-gate 557c478bd9Sstevel@tonic-gate ENTRY(strlcpy) 567c478bd9Sstevel@tonic-gate 577c478bd9Sstevel@tonic-gate .align 32 587c478bd9Sstevel@tonic-gate save %sp, -SA(WINDOWSIZE), %sp 597c478bd9Sstevel@tonic-gate subcc %g0, %i2, %g4 ! n = -n or n == 0 ? 607c478bd9Sstevel@tonic-gate bz,pn %icc, .getstrlen ! if 0 do nothing but strlen(src) 617c478bd9Sstevel@tonic-gate add %i1, %i2, %i3 ! i3 = src + n 627c478bd9Sstevel@tonic-gate andcc %i1, 3, %i4 ! word aligned? 637c478bd9Sstevel@tonic-gate bz,pn %icc, .wordaligned 647c478bd9Sstevel@tonic-gate add %i0, %i2, %i2 ! n = dst + n 657c478bd9Sstevel@tonic-gate sub %i4, 4, %i4 ! bytes until src aligned 667c478bd9Sstevel@tonic-gate 677c478bd9Sstevel@tonic-gate.alignsrc: 687c478bd9Sstevel@tonic-gate ldub [%i3 + %g4], %l1 ! l1 = src[] 697c478bd9Sstevel@tonic-gate andcc %l1, 0xff, %g0 ! null byte reached? 707c478bd9Sstevel@tonic-gate stub %l1, [%i2 + %g4] ! dst[] = src[] 717c478bd9Sstevel@tonic-gate bz,a %icc, .done 727c478bd9Sstevel@tonic-gate add %i2, %g4, %i2 ! get single dest ptr for strlen 737c478bd9Sstevel@tonic-gate addcc %g4, 1, %g4 ! src++ dest++ n-- 747c478bd9Sstevel@tonic-gate bz,pn %icc, .forcenullunalign ! n == 0, append null byte 757c478bd9Sstevel@tonic-gate addcc %i4, 1, %i4 ! incr, check align 767c478bd9Sstevel@tonic-gate bnz,a %icc, .alignsrc 777c478bd9Sstevel@tonic-gate nop 787c478bd9Sstevel@tonic-gate 797c478bd9Sstevel@tonic-gate.wordaligned: 807c478bd9Sstevel@tonic-gate sethi %hi(0x01010101), %i4 817c478bd9Sstevel@tonic-gate add %i2, %g4, %l0 ! l0 = dest 827c478bd9Sstevel@tonic-gate or %i4, %lo(0x01010101), %i4 837c478bd9Sstevel@tonic-gate sub %i2, 4, %i2 ! pre-incr for in cpy loop 847c478bd9Sstevel@tonic-gate andcc %l0, 3, %g1 ! word aligned? 857c478bd9Sstevel@tonic-gate bnz %icc, .dstnotaligned 867c478bd9Sstevel@tonic-gate sll %i4, 7, %i5 ! Mycroft part deux 877c478bd9Sstevel@tonic-gate 887c478bd9Sstevel@tonic-gate.storeword: 897c478bd9Sstevel@tonic-gate ld [%i3 + %g4], %l1 ! l1 = src[] 907c478bd9Sstevel@tonic-gate addcc %g4, 4, %g4 ! n += 4, src += 4, dst +=4 917c478bd9Sstevel@tonic-gate bcs,pn %icc, .lastword 927c478bd9Sstevel@tonic-gate andn %i5, %l1, %g1 ! ~word & 0x80808080 937c478bd9Sstevel@tonic-gate sub %l1, %i4, %l0 ! word - 0x01010101 947c478bd9Sstevel@tonic-gate andcc %l0, %g1, %g0 ! doit 957c478bd9Sstevel@tonic-gate bz,a,pt %icc, .storeword ! if expr == 0, no zero byte 967c478bd9Sstevel@tonic-gate st %l1, [%i2 + %g4] ! dst[] = src[] 977c478bd9Sstevel@tonic-gate 987c478bd9Sstevel@tonic-gate.zerobyte: 997c478bd9Sstevel@tonic-gate add %i2, %g4, %i2 ! ptr to dest 1007c478bd9Sstevel@tonic-gate srl %l1, 24, %g1 ! 1st byte 1017c478bd9Sstevel@tonic-gate andcc %g1, 0xff, %g0 ! test for end 1027c478bd9Sstevel@tonic-gate bz,pn %icc, .done 1037c478bd9Sstevel@tonic-gate stb %g1, [%i2] ! store byte 1047c478bd9Sstevel@tonic-gate add %i2, 1, %i2 ! dst ++ 1057c478bd9Sstevel@tonic-gate srl %l1, 16, %g1 ! 2nd byte 1067c478bd9Sstevel@tonic-gate andcc %g1, 0xff, %g0 ! zero byte ? 1077c478bd9Sstevel@tonic-gate bz,pn %icc, .done 1087c478bd9Sstevel@tonic-gate stb %g1, [%i2] ! store byte 1097c478bd9Sstevel@tonic-gate add %i2, 1, %i2 ! dst ++ 1107c478bd9Sstevel@tonic-gate srl %l1, 8, %g1 ! 3rd byte 1117c478bd9Sstevel@tonic-gate andcc %g1, 0xff, %g0 ! zero byte ? 1127c478bd9Sstevel@tonic-gate bz,pn %icc, .done 1137c478bd9Sstevel@tonic-gate stb %g1, [%i2] ! store byte 1147c478bd9Sstevel@tonic-gate stb %l1, [%i2 + 1] ! store last byte 1157c478bd9Sstevel@tonic-gate add %i2, 1, %i2 ! dst ++ 1167c478bd9Sstevel@tonic-gate 1177c478bd9Sstevel@tonic-gate.done: 1187c478bd9Sstevel@tonic-gate sub %i2, %i0, %i0 ! len = dst - orig dst 1197c478bd9Sstevel@tonic-gate ret 1207c478bd9Sstevel@tonic-gate restore %i0, %g0, %o0 1217c478bd9Sstevel@tonic-gate 1227c478bd9Sstevel@tonic-gate.lastword: 1237c478bd9Sstevel@tonic-gate add %i2, %g4, %i2 1247c478bd9Sstevel@tonic-gate sub %g4, 4, %g4 ! undo pre-incr 1257c478bd9Sstevel@tonic-gate add %i3, %g4, %i3 1267c478bd9Sstevel@tonic-gate 1277c478bd9Sstevel@tonic-gate srl %l1, 24, %g1 ! 1st byte 1287c478bd9Sstevel@tonic-gate andcc %g1, 0xff, %g0 ! zero byte? 1297c478bd9Sstevel@tonic-gate bz,pn %icc, .done 1307c478bd9Sstevel@tonic-gate stb %g1, [%i2] ! store byte 1317c478bd9Sstevel@tonic-gate inccc %g4 ! n-- 1327c478bd9Sstevel@tonic-gate bz .forcenull 1337c478bd9Sstevel@tonic-gate srl %l1, 16, %g1 ! 2nd byte 1347c478bd9Sstevel@tonic-gate add %i2, 1, %i2 ! dst++ 1357c478bd9Sstevel@tonic-gate andcc %g1, 0xff, %g0 ! zero? 1367c478bd9Sstevel@tonic-gate bz,pn %icc, .done 1377c478bd9Sstevel@tonic-gate stb %g1, [%i2] ! store 1387c478bd9Sstevel@tonic-gate inccc %g4 1397c478bd9Sstevel@tonic-gate bz .forcenull 1407c478bd9Sstevel@tonic-gate srl %l1, 8, %g1 ! 3rd byte 1417c478bd9Sstevel@tonic-gate add %i2, 1, %i2 ! dst++ 1427c478bd9Sstevel@tonic-gate andcc %g1, 0xff, %g0 ! zero? 1437c478bd9Sstevel@tonic-gate bz,pn %icc, .done 1447c478bd9Sstevel@tonic-gate stb %g1, [%i2] ! store 1457c478bd9Sstevel@tonic-gate inccc %g4 ! n-- 1467c478bd9Sstevel@tonic-gate bz .forcenull 1477c478bd9Sstevel@tonic-gate andcc %l1, 0xff, %g0 ! zero? 1487c478bd9Sstevel@tonic-gate add %i2, 1, %i2 ! dst++ 1497c478bd9Sstevel@tonic-gate bz,pn %ncc, .done 1507c478bd9Sstevel@tonic-gate stb %l1, [%i2] 1517c478bd9Sstevel@tonic-gate 1527c478bd9Sstevel@tonic-gate.forcenull: 1537c478bd9Sstevel@tonic-gate stb %g0, [%i2] 1547c478bd9Sstevel@tonic-gate 1557c478bd9Sstevel@tonic-gate.searchword: 1567c478bd9Sstevel@tonic-gate ld [%i3], %l1 1577c478bd9Sstevel@tonic-gate.searchword2: 1587c478bd9Sstevel@tonic-gate andn %i5, %l1, %g1 ! word & 0x80808080 1597c478bd9Sstevel@tonic-gate sub %l1, %i4, %l0 ! word - 0x01010101 1607c478bd9Sstevel@tonic-gate andcc %l0, %g1, %g0 ! do it 1617c478bd9Sstevel@tonic-gate bz,a,pt %icc, .searchword 1627c478bd9Sstevel@tonic-gate add %i3, 4, %i3 ! src += 4 1637c478bd9Sstevel@tonic-gate 1647c478bd9Sstevel@tonic-gate mov 0xff, %i5 1657c478bd9Sstevel@tonic-gate sll %i5, 24, %i5 ! mask 1st byte = 0xff000000 1667c478bd9Sstevel@tonic-gate.searchbyte: 1677c478bd9Sstevel@tonic-gate andcc %l1, %i5, %g0 ! cur byte 0? 1687c478bd9Sstevel@tonic-gate srl %i5, 8, %i5 ! mask next byte 1697c478bd9Sstevel@tonic-gate bnz,a %icc, .searchbyte ! cur !=0 continue 1707c478bd9Sstevel@tonic-gate add %i3, 1, %i3 1717c478bd9Sstevel@tonic-gate 1727c478bd9Sstevel@tonic-gate.endfound: 1737c478bd9Sstevel@tonic-gate sub %i3, %i1, %i0 ! len = src - orig src 1747c478bd9Sstevel@tonic-gate ret 1757c478bd9Sstevel@tonic-gate restore %i0, %g0, %o0 1767c478bd9Sstevel@tonic-gate nop 1777c478bd9Sstevel@tonic-gate 1787c478bd9Sstevel@tonic-gate.dstnotaligned: 1797c478bd9Sstevel@tonic-gate cmp %g1, 2 ! halfword aligned? 1807c478bd9Sstevel@tonic-gate be .storehalfword2 1817c478bd9Sstevel@tonic-gate .empty 1827c478bd9Sstevel@tonic-gate.storebyte: 1837c478bd9Sstevel@tonic-gate ld [%i3 + %g4], %l1 ! load src word 1847c478bd9Sstevel@tonic-gate addcc %g4, 4, %g4 ! src +=4 dst +=4 1857c478bd9Sstevel@tonic-gate bcs,pn %icc, .lastword 1867c478bd9Sstevel@tonic-gate andn %i5, %l1, %g1 ! ~x & 0x80808080 1877c478bd9Sstevel@tonic-gate sub %l1, %i4, %l0 ! x - 0x01010101 1887c478bd9Sstevel@tonic-gate andcc %l0, %g1, %g0 ! get your Mycroft on 1897c478bd9Sstevel@tonic-gate bnz,pn %icc, .zerobyte ! non-zero, we have zero byte 1907c478bd9Sstevel@tonic-gate add %i2, %g4, %l0 ! dst in ptr form 1917c478bd9Sstevel@tonic-gate srl %l1, 24, %g1 ! get 1st byte, then be hw aligned 1927c478bd9Sstevel@tonic-gate stb %g1, [%l0] 1937c478bd9Sstevel@tonic-gate srl %l1, 8, %g1 ! 2nd & 3rd bytes 1947c478bd9Sstevel@tonic-gate sth %g1, [%l0 + 1] 1957c478bd9Sstevel@tonic-gate ba .storebyte 1967c478bd9Sstevel@tonic-gate stb %l1, [%l0 + 3] ! store 4th byte 1977c478bd9Sstevel@tonic-gate 1987c478bd9Sstevel@tonic-gate.storehalfword: 1997c478bd9Sstevel@tonic-gate ld [%i3 + %g4], %l1 ! src word 2007c478bd9Sstevel@tonic-gate.storehalfword2: 2017c478bd9Sstevel@tonic-gate addcc %g4, 4, %g4 ! src += 4 dst += 4 2027c478bd9Sstevel@tonic-gate bcs,pn %icc, .lastword 2037c478bd9Sstevel@tonic-gate andn %i5, %l1, %g1 ! ~x & 0x80808080 2047c478bd9Sstevel@tonic-gate sub %l1, %i4, %l0 ! x - 0x01010101 2057c478bd9Sstevel@tonic-gate andcc %l0, %g1, %g0 ! Mycroft again... 2067c478bd9Sstevel@tonic-gate bnz,pn %icc, .zerobyte ! non-zer, we have zero byte 2077c478bd9Sstevel@tonic-gate add %i2, %g4, %l0 ! dst in ptr form 2087c478bd9Sstevel@tonic-gate srl %l1, 16, %g1 ! first two bytes 2097c478bd9Sstevel@tonic-gate sth %g1, [%l0] 2107c478bd9Sstevel@tonic-gate ba .storehalfword 2117c478bd9Sstevel@tonic-gate sth %l1, [%l0 + 2] 2127c478bd9Sstevel@tonic-gate 2137c478bd9Sstevel@tonic-gate.forcenullunalign: 2147c478bd9Sstevel@tonic-gate add %i2, %g4, %i2 ! single dst ptr 2157c478bd9Sstevel@tonic-gate stb %g0, [%i2 - 1] ! store terminating null byte 2167c478bd9Sstevel@tonic-gate 2177c478bd9Sstevel@tonic-gate.getstrlen: 2187c478bd9Sstevel@tonic-gate sethi %hi(0x01010101), %i4 ! Mycroft... 2197c478bd9Sstevel@tonic-gate or %i4, %lo(0x01010101), %i4 2207c478bd9Sstevel@tonic-gate sll %i4, 7, %i5 2217c478bd9Sstevel@tonic-gate 2227c478bd9Sstevel@tonic-gate.getstrlenloop: 2237c478bd9Sstevel@tonic-gate andcc %i3, 3, %g0 ! word aligned? 2247c478bd9Sstevel@tonic-gate bz,a,pn %icc, .searchword2 ! search word at a time 2257c478bd9Sstevel@tonic-gate ld [%i3], %l1 ! src word 2267c478bd9Sstevel@tonic-gate ldub [%i3], %l1 ! src byte 2277c478bd9Sstevel@tonic-gate andcc %l1, 0xff, %g0 ! end of src? 2287c478bd9Sstevel@tonic-gate bnz,a %icc, .getstrlenloop 2297c478bd9Sstevel@tonic-gate add %i3, 1, %i3 ! src ++ 2307c478bd9Sstevel@tonic-gate sub %i3, %i1, %i0 ! len = src - orig src 2317c478bd9Sstevel@tonic-gate ret 2327c478bd9Sstevel@tonic-gate restore %i0, %g0, %o0 2337c478bd9Sstevel@tonic-gate SET_SIZE(strlcpy) 234