diff options
Diffstat (limited to 'newlib/libc/machine/hppa/strncpy.S')
| -rw-r--r-- | newlib/libc/machine/hppa/strncpy.S | 256 |
1 files changed, 0 insertions, 256 deletions
diff --git a/newlib/libc/machine/hppa/strncpy.S b/newlib/libc/machine/hppa/strncpy.S deleted file mode 100644 index 3b1503e..0000000 --- a/newlib/libc/machine/hppa/strncpy.S +++ /dev/null @@ -1,256 +0,0 @@ -/* - * (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 $ */ -/* - * strncpy(s1, s2, n) - * - * Copy s2 to s1, truncating or null-padding to always copy n bytes - * return 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 save r1 - - -ENTRY(strncpy) - - combt,= s_addr,r0,pad_null_bytes1 /* if s2==NULL then pad nulls and exit */ - copy d_addr,ret0 /* The return value is defined to be the value of d_addr. DELAY SLOT*/ - addibt,<,n -4,count,byteloop /* If count is <= 4 don't get fancy.*/ - - extru s_addr,31,2,tmp1 /* 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*/ - comb,<> tmp5,tmp1,not_aligned /* branch if tmp5<>tmp1. */ - 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 - b skip_mask /* don't reload tmp1*/ - or save,tmp1,tmp1 /* or mask with data*/ - -chunks: - ldwm 4(0,s_addr),tmp1 /* get a word*/ - -skip_mask: - uxor,nbz tmp1,r0,save /* check for null*/ - b,n 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*/ - add d_addr,count,d_addr/* final store address is +1 too high !*/ - 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 - bv 0(r2) - stbys,e tmp1,0(d_addr) /* done */ - -/* Begin non_aligned code. */ -not_aligned: - sub,>= tmp5,tmp1,tmp3 /* compute the shift amt.and skip load if tmp5 > tmp1.*/ - ldwm 4(0,s_addr),tmp1 /* load up the first word from the source. tmp1 = *s_addr++*/ - zdep tmp3,28,29,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_mask2 /* 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 */ - b skip_mask2 - copy r0, tmp5 /* zero out tmp5 so we don't try to mask again*/ - -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 ! */ - - ldwm 4(0,s_addr),tmp1 /* get 2nd word ! */ - vshd tmp2,tmp1,tmp3 /* position data ! */ - uxor,nbz tmp3, r0, save - b,n null4 - - 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 */ - copy r0, tmp5 /* zero out tmp5 so we don't try to mask again*/ -skip_mask3: - uxor,nbz tmp3,r0,save - b,n null4 - 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 used in the 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,sbz tmp3,r0,save /* if some-byte-zero */ - b no_null /* don't goto no_null-find which null instead */ - add d_addr,count,d_addr /* get d_addr ready for stbys,e */ - extru,<> save,7,8,r0 - b found_null5 - copy r0, tmp5 - extru,<> save,15,8,r0 - b found_null5 - ldil 0x1FE000,tmp5 /* setup mask (FF000000)*/ - extru,<> save,23,8,r0 - b found_null5 - ldil 0x1FFFE0,tmp5 /* setup mask (FFFF0000)*/ - ldo -1(r0),tmp5 /* setup mask (FFFFFFFF)*/ -found_null5: - and tmp3,tmp5,tmp3 /* zero out tmp5 based on mask in tmp5*/ -no_null: - bv 0(r2) /* were done*/ - stbys,e tmp3,0(0,d_addr) /* store the data !*/ - -/* here we do ye old byte-at-a-time moves.*/ -byteloop: - addibt,=,n 4,count,done - comb,= 0,s_addr,done - stbs r0,0(d_addr) /* store null in case s_addr == NULL */ - ldbs,ma 1(s_addr),tmp1 -encore: - combt,=,n tmp1,r0, pad_null_bytes1 - stbs,ma tmp1,1(d_addr) - addibf,=,n -1,count,encore - ldbs,ma 1(s_addr),tmp1 - b,n done - -pnb_1: - addibt,=,n 4,count,done /* if count was already 0 then we're done*/ - -pad_null_bytes1: - combt,=,n count,r0,done /* if count==0 then exit */ -pad_null_bytes2: - addibf,= -1,count,pad_null_bytes2 - stbs,ma r0,1(d_addr) - b,n done - -pad_nulls: - addibf,<=,n -4,count,pad_nulls - stwm r0,4(d_addr) - b,n pnb_1 - - -null1: - extru,<> save,7,8,r0 - b found_null1 - copy r0, tmp5 - extru,<> save,15,8,r0 - b found_null1 - ldil 0x1FE000,tmp5 /* setup mask (FF000000)*/ - extru,<> save,23,8,r0 - b found_null1 - ldil 0x1FFFE0,tmp5 /* setup mask (FFFF0000)*/ - ldo -1(r0),tmp5 /* setup mask (FFFFFFFF)*/ -found_null1: - and tmp1,tmp5,tmp1 /*zero out tmp1 according to mask*/ - b pad_nulls /* nullify remaining count bytes*/ - stbys,b,m tmp1,4(0,d_addr) /* first word (account for alignment)*/ - - -null2: /* back porch case. We have less than 4 bytes to go.*/ - extru,<> save,7,8,r0 /* is null in 1st byte? */ - b found_null2 - copy r0, tmp5 - extru,<> save,15,8,r0 /* is null in 2nd byte? */ - b found_null2 - ldil 0x1FE000,tmp5 /* setup mask (FF000000)*/ - b found_null2 /* null must be in 3rd byte */ - ldil 0x1FFFE0,tmp5 /* setup mask (FFFF0000)*/ -found_null2: - and tmp1,tmp5,tmp1 /*zero out tmp1 according to mask*/ - bv 0(r2) /* we're done*/ - stbys,e tmp1,0(0,d_addr) /* last word (back porch)*/ - -null3: /* not_aligned case where null is found in first of two words--adjust count*/ - extru,<> save,7,8,r0 - b found_null3 - copy r0, tmp5 - extru,<> save,15,8,r0 - b found_null3 - ldil 0x1FE000,tmp5 /* setup mask (FF000000)*/ - extru,<> save,23,8,r0 - b found_null3 - ldil 0x1FFFE0,tmp5 /* setup mask (FFFF0000)*/ - ldo -1(r0),tmp5 /* setup mask (FFFFFFFF)*/ -found_null3: - addi 4,count,count /* fix count since null is in first of two words*/ - and tmp3,tmp5,tmp3 /*zero out tmp3 according to mask*/ - b pad_nulls /* nullify remaining count bytes*/ - stbys,b,m tmp3,4(d_addr) - -null4: /* not_aligned case where null is found in second of two words*/ - extru,<> save,7,8,r0 - b found_null4 - copy r0, tmp5 - extru,<> save,15,8,r0 - b found_null4 - ldil 0x1FE000,tmp5 /* setup mask (FF000000)*/ - extru,<> save,23,8,r0 - b found_null4 - ldil 0x1FFFE0,tmp5 /* setup mask (FFFF0000)*/ - ldo -1(r0),tmp5 /* setup mask (FFFFFFFF)*/ -found_null4: - and tmp3,tmp5,tmp3 /*zero out tmp4 according to mask*/ - b pad_nulls /* nullify remaining count bytes*/ - stbys,b,m tmp3,4(d_addr) - -done: -EXIT(strncpy) |