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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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/*
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* strcat(s1, s2)
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*
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* Concatenate s2 on the end of s1. S1's space must be large enough.
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* Return s1.
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*/
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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 tmp6 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 save r1
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ENTRY(strcat)
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comb,= r0,s_addr,done /* 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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extru s_addr,31,2,tmp1 /* Extract the low two bits of the source address. */
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extru d_addr,31,2,tmp6 /* Extract the low two bits of the destination address. */
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sub,= tmp6,tmp1,tmp3 /* Compute the shift quantity and don't branch if tmp6=tmp1. */
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b not_aligned /* Not_aligned says that shifts Will be needed. */
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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,= tmp6,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 tmp6,r0,save
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mtctl save,r11
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zvdepi -2,32,save
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or save,tmp1,tmp1
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uxor,nbz tmp1,r0,save
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b,n first_null /* special case: null in first word */
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b,n skip_mask2
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chunks:
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b,n null_found /* delay slot for uxor below */
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skip_mask2:
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stbys,b,m tmp1,4(d_addr)
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ldwm 4(s_addr),tmp1
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skip_mask:
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comib,tr 0,0,chunks
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uxor,nbz tmp1,r0,save
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/* Begin non_aligned code. */
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not_aligned:
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sh3add,>= tmp3,r0,tmp4 /* compute the shift amt.and skip load if tmp6 > tmp1. */
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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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ldwm 4(0,s_addr),tmp2 /* get either first or second word from source. */
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combt,= tmp6,r0,chunk2 /* don't mask if whole word is valid */
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mtctl tmp4,11 /* load the shift count into cr11 = shift count register. */
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vshd tmp1,tmp2,tmp3 /* position data ! (delay slot) */
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sh3add tmp6,r0,save /* setup r1 */
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mtctl save,r11 /* set-up cr11 for mask */
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zvdepi -2,32,save
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or save, tmp3, tmp3
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uxor,nbz tmp3,r0,save
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b,n first_null2
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b did_mask
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mtctl tmp4,11 /* re-load the shift count into cr11 */
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chunk2:
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vshd tmp1,tmp2,tmp3
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uxor,nbz tmp3, r0, save
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b,n null_found
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did_mask:
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stbys,b,m tmp3,4(0,d_addr) /* store ! */
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ldwm 4(0,s_addr),tmp1 /* get next 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 null_found
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stwm tmp3,4(d_addr)
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comib,tr 0,0,chunk2
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ldwm 4(s_addr),tmp2
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null_found: /* adjust d_addr and store final word */
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extru,<> save,7,8,r0
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addib,tr,n 1,d_addr,store_final
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extru,<> save,15,8,r0
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addib,tr,n 2,d_addr,store_final
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extru,<> save,23,8,r0
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addib,tr 3,d_addr,store_final2
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bv 0(r2)
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stw save,0(d_addr)
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store_final:
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bv 0(r2)
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store_final2:
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stbys,e save,0(d_addr) /* delay slot */
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first_null: /* null found in first word of aligned (wrt d_addr) */
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addi -4,s_addr,s_addr
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ldbx tmp6(s_addr),tmp4
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add tmp6,s_addr,s_addr
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comib,= 0,tmp4,done
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stbs,ma tmp4,1(d_addr)
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ldbs 1(s_addr),tmp4
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comib,= 0,tmp4,done
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stbs,ma tmp4,1(d_addr)
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bv 0(r2) /* done */
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stbs 0,0(d_addr)
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first_null2: /* null found in first word of non-aligned (wrt d_addr) */
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addibt,= -1,tmp6,check3 /* check last 3 bytes of word */
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extru save,15,8,tmp4
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addibt,=,n -1,tmp6,check2 /* check last 2 bytes */
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bv 0(r2)
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stbys,b save, 0(d_addr)
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check3:
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combt,= tmp4,r0,done
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stbs,ma tmp4,1(d_addr)
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check2:
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extru,<> save,23,8,tmp4
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bv 0(r2)
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stbs,ma tmp4,1(d_addr)
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bv 0(r2)
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stbs r0,0(d_addr)
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done:
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EXIT(strcat)
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