diff options
Diffstat (limited to 'newlib/libc/machine/hppa/strncat.S')
| -rw-r--r-- | newlib/libc/machine/hppa/strncat.S | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/newlib/libc/machine/hppa/strncat.S b/newlib/libc/machine/hppa/strncat.S new file mode 100644 index 0000000..89d8f3a --- /dev/null +++ b/newlib/libc/machine/hppa/strncat.S @@ -0,0 +1,238 @@ +/* + * (c) Copyright 1986 HEWLETT-PACKARD COMPANY + * + * To anyone who acknowledges that this file is provided "AS IS" + * without any express or implied warranty: + * permission to use, copy, modify, and distribute this file + * for any purpose is hereby granted without fee, provided that + * the above copyright notice and this notice appears in all + * copies, and that the name of Hewlett-Packard Company not be + * used in advertising or publicity pertaining to distribution + * of the software without specific, written prior permission. + * Hewlett-Packard Company makes no representations about the + * suitability of this software for any purpose. + */ + +/*HPUX_ID: @(#) $Revision: 1.1 $ */ +/* strncat(s1,s2,n) : concatonate at most n characters from s2 onto s1 */ + +#include "DEFS.h" + +#define d_addr r26 +#define s_addr r25 +#define count r24 +#define tmp1 r19 +#define tmp2 r20 +#define tmp3 r21 +#define tmp4 r22 +#define tmp5 arg3 +#define tmp6 r31 +#define save r1 +#define tmp7 ret1 /* source offset-- reset to orig source addr if not aligned */ + + +ENTRY(strncat) + + comb,= r0,s_addr,quit /* quit if s2=NULL */ + copy d_addr,ret0 /* The return value is the value of d_addr. DELAY SLOT*/ + +/* First look for end of s1 (d_addr) */ + + extru d_addr,31,2,tmp1 /* Extract the low two bits of the dest address. */ + combt,= tmp1,r0,dont_mask + dep 0,31,2,d_addr /*set word alignment */ + ldwm 4(d_addr),tmp2 + sh3add tmp1,r0,save /* build mask based on tmp1 */ + mtctl save,11 + zvdepi -2,32,save + or save,tmp2,tmp2 + uxor,nbz tmp2,r0,save +search: + b,n found_end /* nullified under uxor conditions above and below */ +dont_mask: + ldwm 4(d_addr),tmp2 + comib,tr r0,r0,search + uxor,nbz tmp2,r0,save + +found_end: /* at this point d_addr points to word */ + extru,<> save,7,8,r0 /* following word with null */ + addib,tr,n -4,d_addr,begin_copy /*set d_addr to end of s1 */ + extru,<> save,15,8,r0 + addib,tr,n -3,d_addr,begin_copy + extru,<> save,23,8,r0 + addi -1,d_addr,d_addr + addi -1,d_addr,d_addr + + +begin_copy: + addibt,<,n -4,count,byteloop /* If count is <= 4 don't get fancy.*/ + + extru s_addr,31,2,tmp4 /* Extract the low two bits of the source address.*/ + extru d_addr,31,2,tmp5 /* Extract the low two bits of the destination address.*/ + add count,tmp5,count /* pre increment the count by the byte address so that the count is*/ + copy s_addr,tmp6 /* save original s_addr in case we find null in first word */ + copy s_addr, tmp7 /* save s_addr in case we find null before first store */ + comb,<> tmp5,tmp4,not_aligned /* branch if tmp5<>tmp4. */ + dep 0,31,2,s_addr /* Compute the word address of the source. DELAY SLOT.*/ +/* aligned*/ + combt,= tmp5,r0,skip_mask + ldwm 4(0,s_addr),tmp1 /* tmp1 = *s_addr s_addr += 4 (DELAY SLOT)*/ + sh3add tmp5,r0,save /* compute mask in save*/ + mtctl save,11 + zvdepi -2,32,save + or save,tmp1,tmp1 /* or mask with data*/ + uxor,nbz tmp1,r0,save /* check for null*/ + b,n null1 + addibt,< -4,count,back_porch + stbys,b,m tmp1,4(0,d_addr) /* store word (delay slot)*/ + +chunks: + ldwm 4(0,s_addr),tmp1 /* get a word*/ + +skip_mask: + uxor,nbz tmp1,r0,save /* check for null*/ + b,n align_null1 + addibf,< -4,count,chunks + stbys,b,m tmp1,4(0,d_addr) /* store word (delay slot)*/ + +back_porch: /* last word to store*/ + addibt,=,n 4,count,done /* if count = 0 we're, of course, done !*/ + ldws 0(s_addr),tmp1 /* load up the back_porch*/ + sh3add count,r0, save /* setup right mask based on count*/ + mtctl save,r11 + zvdepi -2,32,save /*save now has left-hand mask*/ + uaddcm r0,save,save /*form right hand mask */ + or tmp1,save,tmp1 /*and insert data*/ + uxor,nbz tmp1,r0,save /* check for null*/ + b,n null2 + add d_addr,count,d_addr/* final store address is +1 too high !*/ + b done + stbys,e tmp1,0(d_addr) /* done */ + +/* Begin non_aligned code. */ +not_aligned: + sub,>= tmp5,tmp4,tmp6 /* compute the shift amt.and skip load if tmp5 > tmp4.*/ + ldwm 4(0,s_addr),tmp1 /* load up the first word from the source. tmp1 = *s_addr++*/ + zdep tmp6,28,29,tmp4 /* compute the number of bits to shift */ + mtctl tmp4,11 /* load the shift count into cr11 = shift count register.*/ + addibt,<,n -4,count,chkchnk2 /* first step in pre adjustment of count for looping.*/ + + ldwm 4(0,s_addr),tmp2 /* get either first or second word from source. */ + combt,= tmp5,r0,skip_mask4 /* don't mask if whole word is valid*/ + vshd tmp1,tmp2,tmp3 /* position data ! (delay slot)*/ + sh3add tmp5,r0,save /* setup r1*/ + mtctl save,r11 /* setup mask in save*/ + zvdepi -2,32,save + or save, tmp3, tmp3 + mtctl tmp4,11 /* re-load the shift count into cr11 */ + +skip_mask4: + uxor,nbz tmp3, r0, save + b,n null4 /* special case for first word */ + copy r0, tmp5 /* zero out tmp5 so we don't try to mask again*/ + copy r0, tmp7 /* zero out tmp7 so we don't try to use original s_addr anymore */ + b continue + stbys,b,m tmp3,4(0,d_addr) /* store ! */ + +chunk2: + ldwm 4(0,s_addr),tmp2 + vshd tmp1,tmp2,tmp3 + +skip_mask2: + uxor,nbz tmp3, r0, save + b,n null3 + stbys,b,m tmp3,4(0,d_addr) /* store ! */ + +continue: + ldwm 4(0,s_addr),tmp1 /* get 2nd word ! */ + vshd tmp2,tmp1,tmp3 /* position data ! */ + uxor,nbz tmp3, r0, save + b,n null3 + + addibf,< -8,count,chunk2 /* If count is still >= 8 do another loop.*/ + stbys,b,m tmp3,4(0,d_addr) /* store !*/ + +chkchnk2: + addibt,<,n 4,count,bp_0 /* if we don't have 4 bytes left then do the back porch (bp_0)*/ + +subchnk2: /* we have less than 8 chars to copy*/ + + ldwm 4(0,s_addr),tmp2 /* get next word !*/ + combt,= tmp5,r0,skip_mask3 + vshd tmp1,tmp2,tmp3 /* position data !*/ + sh3add tmp5,r0,save /* setup r1*/ + mtctl save,r11 /* setup mask in save*/ + zvdepi -2,32,save + or save, tmp3, tmp3 + mtctl tmp4,11 /* restore shift value again */ +skip_mask3: + uxor,nbz tmp3,r0,save + b,n null3 + copy r0,tmp5 /* zero out tmp5 so null3 does correct alignment */ + copy r0,tmp7 /* zero out tmp7 so we don't use orignal s_addr since no longer valid */ + b bp_1 /* we now have less than 4 bytes to move*/ + stbys,b,m tmp3,4(0,d_addr) /* store !*/ + +bp_0: + copy tmp1,tmp2 /* switch registers for shift process */ + addibt,<=,n 4,count,done /* if count = -4 this implies that count = 0 -> done */ + +bp_1: + ldwm 4(0,s_addr),tmp1 /* get final word ! */ + vshd tmp2,tmp1,tmp3 /* position data !*/ + uxor,nbz tmp3,r0,save /* if no-byte-zero */ + b,n bp_null /* don't goto no_null-find which null instead */ +no_null: + add d_addr,count,d_addr /* set up d_addr for stbys,e */ + b done /* were done*/ + stbys,e tmp3,0(0,d_addr) /* store the data !*/ + +/* here we do ye old byte-at-a-time moves.*/ +align_null1: + b byteloop + addi -4,s_addr,s_addr +null1: + copy tmp6,s_addr /* restore orig s_addr (aligned only) */ +byteloop: + addibt,= 4,count,done +null2: + ldbs,ma 1(s_addr),tmp1 +encore: + combt,=,n tmp1,r0, done + stbs,ma tmp1,1(d_addr) + addibf,=,n -1,count,encore + ldbs,ma 1(s_addr),tmp1 + b,n done + +bp_null: + addi -4,count,count /* fudge count 'cause byteloop will re-increment */ + +null3: /* not_aligned case reset s_addr and finish byte-wise */ + combt,=,n r0,tmp7,null3a /* if tmp7 is not valid address then branch below */ + b byteloop /* otherwise reset s_addr to tmp7 and finish */ + copy tmp7, s_addr + +null3a: /* right shift target */ + addibt,<,n 0,tmp6,null3b /* if left shifting */ + sub r0,tmp6,tmp6 /* do null3b code */ + addi -4,tmp6,tmp6 + b byteloop + add tmp6,s_addr,s_addr /* reset s_addr by 4 + shift_amt */ + +null3b: + subi -8,tmp6,tmp6 + add tmp5,tmp6,tmp6 /* adjust by the dest offset if this is our first store */ + b byteloop + add tmp6,s_addr,s_addr /* adjust s_addr by (8-shift_amt-dest_off) */ + +null4: + add,> tmp6,r0,tmp6 /* if left shift */ + b,n null3 /* then do null3 */ + b byteloop + addi -4,s_addr,s_addr /* adj source only by 4 */ + +done: + bv 0(r2) + stbs r0,0(d_addr) +quit: +EXIT(strncat) |