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jeremybenn |
/*
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* (c) Copyright 1986 HEWLETT-PACKARD COMPANY
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*
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* To anyone who acknowledges that this file is provided "AS IS"
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* without any express or implied warranty:
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* permission to use, copy, modify, and distribute this file
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* for any purpose is hereby granted without fee, provided that
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* the above copyright notice and this notice appears in all
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* copies, and that the name of Hewlett-Packard Company not be
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* used in advertising or publicity pertaining to distribution
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* of the software without specific, written prior permission.
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* Hewlett-Packard Company makes no representations about the
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* suitability of this software for any purpose.
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*/
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/*HPUX_ID: @(#) $Revision: 1.1 $ */
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/* strncat(s1,s2,n) : concatonate at most n characters from s2 onto s1 */
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#include "DEFS.h"
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#define d_addr r26
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#define s_addr r25
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#define count r24
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#define tmp1 r19
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#define tmp2 r20
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#define tmp3 r21
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#define tmp4 r22
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#define tmp5 arg3
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#define tmp6 r31
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#define save r1
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#define tmp7 ret1 /* source offset-- reset to orig source addr if not aligned */
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ENTRY(strncat)
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comb,= r0,s_addr,quit /* quit if s2=NULL */
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copy d_addr,ret0 /* The return value is the value of d_addr. DELAY SLOT*/
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/* First look for end of s1 (d_addr) */
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extru d_addr,31,2,tmp1 /* Extract the low two bits of the dest address. */
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combt,= tmp1,r0,dont_mask
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dep 0,31,2,d_addr /*set word alignment */
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ldwm 4(d_addr),tmp2
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sh3add tmp1,r0,save /* build mask based on tmp1 */
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mtctl save,11
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zvdepi -2,32,save
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or save,tmp2,tmp2
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uxor,nbz tmp2,r0,save
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search:
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b,n found_end /* nullified under uxor conditions above and below */
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dont_mask:
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ldwm 4(d_addr),tmp2
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comib,tr r0,r0,search
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uxor,nbz tmp2,r0,save
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found_end: /* at this point d_addr points to word */
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extru,<> save,7,8,r0 /* following word with null */
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addib,tr,n -4,d_addr,begin_copy /*set d_addr to end of s1 */
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extru,<> save,15,8,r0
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addib,tr,n -3,d_addr,begin_copy
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extru,<> save,23,8,r0
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addi -1,d_addr,d_addr
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addi -1,d_addr,d_addr
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begin_copy:
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addibt,<,n -4,count,byteloop /* If count is <= 4 don't get fancy.*/
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extru s_addr,31,2,tmp4 /* Extract the low two bits of the source address.*/
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extru d_addr,31,2,tmp5 /* Extract the low two bits of the destination address.*/
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add count,tmp5,count /* pre increment the count by the byte address so that the count is*/
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copy s_addr,tmp6 /* save original s_addr in case we find null in first word */
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copy s_addr, tmp7 /* save s_addr in case we find null before first store */
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comb,<> tmp5,tmp4,not_aligned /* branch if tmp5<>tmp4. */
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dep 0,31,2,s_addr /* Compute the word address of the source. DELAY SLOT.*/
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/* aligned*/
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combt,= tmp5,r0,skip_mask
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ldwm 4(0,s_addr),tmp1 /* tmp1 = *s_addr s_addr += 4 (DELAY SLOT)*/
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sh3add tmp5,r0,save /* compute mask in save*/
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mtctl save,11
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zvdepi -2,32,save
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or save,tmp1,tmp1 /* or mask with data*/
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uxor,nbz tmp1,r0,save /* check for null*/
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b,n null1
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addibt,< -4,count,back_porch
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stbys,b,m tmp1,4(0,d_addr) /* store word (delay slot)*/
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chunks:
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ldwm 4(0,s_addr),tmp1 /* get a word*/
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skip_mask:
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uxor,nbz tmp1,r0,save /* check for null*/
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b,n align_null1
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addibf,< -4,count,chunks
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stbys,b,m tmp1,4(0,d_addr) /* store word (delay slot)*/
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back_porch: /* last word to store*/
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addibt,=,n 4,count,done /* if count = 0 we're, of course, done !*/
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ldws 0(s_addr),tmp1 /* load up the back_porch*/
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sh3add count,r0, save /* setup right mask based on count*/
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mtctl save,r11
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zvdepi -2,32,save /*save now has left-hand mask*/
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uaddcm r0,save,save /*form right hand mask */
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or tmp1,save,tmp1 /*and insert data*/
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uxor,nbz tmp1,r0,save /* check for null*/
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b,n null2
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add d_addr,count,d_addr/* final store address is +1 too high !*/
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b done
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stbys,e tmp1,0(d_addr) /* done */
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/* Begin non_aligned code. */
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not_aligned:
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sub,>= tmp5,tmp4,tmp6 /* compute the shift amt.and skip load if tmp5 > tmp4.*/
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ldwm 4(0,s_addr),tmp1 /* load up the first word from the source. tmp1 = *s_addr++*/
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zdep tmp6,28,29,tmp4 /* compute the number of bits to shift */
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mtctl tmp4,11 /* load the shift count into cr11 = shift count register.*/
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addibt,<,n -4,count,chkchnk2 /* first step in pre adjustment of count for looping.*/
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ldwm 4(0,s_addr),tmp2 /* get either first or second word from source. */
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combt,= tmp5,r0,skip_mask4 /* don't mask if whole word is valid*/
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vshd tmp1,tmp2,tmp3 /* position data ! (delay slot)*/
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sh3add tmp5,r0,save /* setup r1*/
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mtctl save,r11 /* setup mask in save*/
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zvdepi -2,32,save
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or save, tmp3, tmp3
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mtctl tmp4,11 /* re-load the shift count into cr11 */
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skip_mask4:
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uxor,nbz tmp3, r0, save
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b,n null4 /* special case for first word */
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copy r0, tmp5 /* zero out tmp5 so we don't try to mask again*/
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copy r0, tmp7 /* zero out tmp7 so we don't try to use original s_addr anymore */
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b continue
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stbys,b,m tmp3,4(0,d_addr) /* store ! */
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chunk2:
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ldwm 4(0,s_addr),tmp2
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vshd tmp1,tmp2,tmp3
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skip_mask2:
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uxor,nbz tmp3, r0, save
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b,n null3
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stbys,b,m tmp3,4(0,d_addr) /* store ! */
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continue:
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ldwm 4(0,s_addr),tmp1 /* get 2nd word ! */
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vshd tmp2,tmp1,tmp3 /* position data ! */
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uxor,nbz tmp3, r0, save
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b,n null3
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addibf,< -8,count,chunk2 /* If count is still >= 8 do another loop.*/
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stbys,b,m tmp3,4(0,d_addr) /* store !*/
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chkchnk2:
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addibt,<,n 4,count,bp_0 /* if we don't have 4 bytes left then do the back porch (bp_0)*/
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subchnk2: /* we have less than 8 chars to copy*/
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ldwm 4(0,s_addr),tmp2 /* get next word !*/
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combt,= tmp5,r0,skip_mask3
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vshd tmp1,tmp2,tmp3 /* position data !*/
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sh3add tmp5,r0,save /* setup r1*/
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mtctl save,r11 /* setup mask in save*/
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zvdepi -2,32,save
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or save, tmp3, tmp3
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mtctl tmp4,11 /* restore shift value again */
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skip_mask3:
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uxor,nbz tmp3,r0,save
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b,n null3
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copy r0,tmp5 /* zero out tmp5 so null3 does correct alignment */
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copy r0,tmp7 /* zero out tmp7 so we don't use orignal s_addr since no longer valid */
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b bp_1 /* we now have less than 4 bytes to move*/
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stbys,b,m tmp3,4(0,d_addr) /* store !*/
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bp_0:
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copy tmp1,tmp2 /* switch registers for shift process */
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addibt,<=,n 4,count,done /* if count = -4 this implies that count = 0 -> done */
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bp_1:
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ldwm 4(0,s_addr),tmp1 /* get final word ! */
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vshd tmp2,tmp1,tmp3 /* position data !*/
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uxor,nbz tmp3,r0,save /* if no-byte-zero */
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b,n bp_null /* don't goto no_null-find which null instead */
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no_null:
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add d_addr,count,d_addr /* set up d_addr for stbys,e */
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b done /* were done*/
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stbys,e tmp3,0(0,d_addr) /* store the data !*/
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/* here we do ye old byte-at-a-time moves.*/
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align_null1:
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b byteloop
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addi -4,s_addr,s_addr
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null1:
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copy tmp6,s_addr /* restore orig s_addr (aligned only) */
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byteloop:
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addibt,= 4,count,done
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null2:
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ldbs,ma 1(s_addr),tmp1
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encore:
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combt,=,n tmp1,r0, done
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stbs,ma tmp1,1(d_addr)
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addibf,=,n -1,count,encore
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ldbs,ma 1(s_addr),tmp1
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b,n done
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bp_null:
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addi -4,count,count /* fudge count 'cause byteloop will re-increment */
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null3: /* not_aligned case reset s_addr and finish byte-wise */
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combt,=,n r0,tmp7,null3a /* if tmp7 is not valid address then branch below */
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b byteloop /* otherwise reset s_addr to tmp7 and finish */
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copy tmp7, s_addr
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null3a: /* right shift target */
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addibt,<,n 0,tmp6,null3b /* if left shifting */
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sub r0,tmp6,tmp6 /* do null3b code */
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addi -4,tmp6,tmp6
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b byteloop
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add tmp6,s_addr,s_addr /* reset s_addr by 4 + shift_amt */
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null3b:
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subi -8,tmp6,tmp6
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add tmp5,tmp6,tmp6 /* adjust by the dest offset if this is our first store */
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b byteloop
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add tmp6,s_addr,s_addr /* adjust s_addr by (8-shift_amt-dest_off) */
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null4:
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add,> tmp6,r0,tmp6 /* if left shift */
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b,n null3 /* then do null3 */
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b byteloop
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addi -4,s_addr,s_addr /* adj source only by 4 */
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done:
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bv 0(r2)
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stbs r0,0(d_addr)
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quit:
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EXIT(strncat)
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