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/*
 *  (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)

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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libc/] [machine/] [hppa/] [strncpy.S] - Blame information for rev 826

Line No.	Rev	Author	Line
1	148	jeremybenn	`/*`
2			`* (c) Copyright 1986 HEWLETT-PACKARD COMPANY`
3			`*`
4			`* To anyone who acknowledges that this file is provided "AS IS"`
5			`* without any express or implied warranty:`
6			`* permission to use, copy, modify, and distribute this file`
7			`* for any purpose is hereby granted without fee, provided that`
8			`* the above copyright notice and this notice appears in all`
9			`* copies, and that the name of Hewlett-Packard Company not be`
10			`* used in advertising or publicity pertaining to distribution`
11			`* of the software without specific, written prior permission.`
12			`* Hewlett-Packard Company makes no representations about the`
13			`* suitability of this software for any purpose.`
14			`*/`
15
16			`/* HPUX_ID: @(#) $Revision: 1.1 $ */`
17			`/*`
18			`* strncpy(s1, s2, n)`
19			`*`
20			`* Copy s2 to s1, truncating or null-padding to always copy n bytes`
21			`* return s1`
22			`*/`
23
24			`#include "DEFS.h"`
25
26			`#define d_addr r26`
27			`#define s_addr r25`
28			`#define count r24`
29			`#define tmp1 r19`
30			`#define tmp2 r20`
31			`#define tmp3 r21`
32			`#define tmp4 r22`
33			`#define tmp5 arg3`
34			`#define save r1`
35
36
37			`ENTRY(strncpy)`
38
39			`combt,= s_addr,r0,pad_null_bytes1 /* if s2==NULL then pad nulls and exit */`
40			`copy d_addr,ret0 /* The return value is defined to be the value of d_addr. DELAY SLOT*/`
41			`addibt,<,n -4,count,byteloop /* If count is <= 4 don't get fancy.*/`
42
43			`extru s_addr,31,2,tmp1 /* Extract the low two bits of the source address.*/`
44			`extru d_addr,31,2,tmp5 /* Extract the low two bits of the destination address.*/`
45			`add count,tmp5,count /* pre increment the count by the byte address so that the count is*/`
46			`comb,<> tmp5,tmp1,not_aligned /* branch if tmp5<>tmp1. */`
47			`dep 0,31,2,s_addr /* Compute the word address of the source. DELAY SLOT.*/`
48			`/* aligned*/`
49			`combt,= tmp5,r0,skip_mask`
50			`ldwm 4(0,s_addr),tmp1 /* tmp1 = s_addr s_addr += 4 (DELAY SLOT)/`
51			`sh3add tmp5,r0,save /* compute mask in save*/`
52			`mtctl save,11`
53			`zvdepi -2,32,save`
54			`b skip_mask /* don't reload tmp1*/`
55			`or save,tmp1,tmp1 /* or mask with data*/`
56
57			`chunks:`
58			`ldwm 4(0,s_addr),tmp1 /* get a word*/`
59
60			`skip_mask:`
61			`uxor,nbz tmp1,r0,save /* check for null*/`
62			`b,n null1`
63			`addibf,< -4,count,chunks`
64			`stbys,b,m tmp1,4(0,d_addr) /* store word (delay slot)*/`
65
66			`/* back_porch last word to store*/`
67			`addibt,=,n 4,count,done /* if count = 0 we're, of course, done !*/`
68			`ldws 0(s_addr),tmp1 /* load up the back_porch*/`
69			`add d_addr,count,d_addr/* final store address is +1 too high !*/`
70			`sh3add count,r0, save /* setup right mask based on count*/`
71			`mtctl save,r11`
72			`zvdepi -2,32,save /save now has left-hand mask/`
73			`uaddcm r0,save,save /form right hand mask /`
74			`or tmp1,save,tmp1 /and insert data/`
75			`uxor,nbz tmp1,r0,save /* check for null*/`
76			`b,n null2`
77			`bv 0(r2)`
78			`stbys,e tmp1,0(d_addr) /* done */`
79
80			`/* Begin non_aligned code. */`
81			`not_aligned:`
82			`sub,>= tmp5,tmp1,tmp3 /* compute the shift amt.and skip load if tmp5 > tmp1.*/`
83			`ldwm 4(0,s_addr),tmp1 /* load up the first word from the source. tmp1 = s_addr++/`
84			`zdep tmp3,28,29,tmp4 /* compute the number of bits to shift */`
85			`mtctl tmp4,11 /* load the shift count into cr11 = shift count register.*/`
86			`addibt,<,n -4,count,chkchnk2 /* first step in pre adjustment of count for looping.*/`
87
88			`ldwm 4(0,s_addr),tmp2 /* get either first or second word from source. */`
89			`combt,= tmp5,r0,skip_mask2 /* don't mask if whole word is valid*/`
90			`vshd tmp1,tmp2,tmp3 /* position data ! (delay slot)*/`
91			`sh3add tmp5,r0,save /* setup r1*/`
92			`mtctl save,r11 /* setup mask in save*/`
93			`zvdepi -2,32,save`
94			`or save, tmp3, tmp3`
95			`mtctl tmp4,11 /* re-load the shift count into cr11 */`
96			`b skip_mask2`
97			`copy r0, tmp5 /* zero out tmp5 so we don't try to mask again*/`
98
99			`chunk2:`
100			`ldwm 4(0,s_addr),tmp2`
101			`vshd tmp1,tmp2,tmp3`
102
103			`skip_mask2:`
104			`uxor,nbz tmp3, r0, save`
105			`b,n null3`
106			`stbys,b,m tmp3,4(0,d_addr) /* store ! */`
107
108			`ldwm 4(0,s_addr),tmp1 /* get 2nd word ! */`
109			`vshd tmp2,tmp1,tmp3 /* position data ! */`
110			`uxor,nbz tmp3, r0, save`
111			`b,n null4`
112
113			`addibf,< -8,count,chunk2 /* If count is still >= 8 do another loop.*/`
114			`stbys,b,m tmp3,4(0,d_addr) /* store !*/`
115
116			`chkchnk2:`
117			`addibt,<,n 4,count,bp_0 /* if we don't have 4 bytes left then do the back porch (bp_0)*/`
118
119			`subchnk2: /* we have less than 8 chars to copy*/`
120
121			`ldwm 4(0,s_addr),tmp2 /* get next word !*/`
122			`combt,= tmp5,r0,skip_mask3`
123			`vshd tmp1,tmp2,tmp3 /* position data !*/`
124			`sh3add tmp5,r0,save /* setup r1*/`
125			`mtctl save,r11 /* setup mask in save*/`
126			`zvdepi -2,32,save`
127			`or save, tmp3, tmp3`
128			`mtctl tmp4,11 /* restore shift value again */`
129			`copy r0, tmp5 /* zero out tmp5 so we don't try to mask again*/`
130			`skip_mask3:`
131			`uxor,nbz tmp3,r0,save`
132			`b,n null4`
133			`b bp_1 /* we now have less than 4 bytes to move*/`
134			`stbys,b,m tmp3,4(0,d_addr) /* store !*/`
135
136			`bp_0:`
137			`copy tmp1,tmp2 /* switch registers used in the shift process.*/`
138			`addibt,<=,n 4,count,done /* if count = -4 this implies that count = 0 -> done */`
139
140			`bp_1:`
141			`ldwm 4(0,s_addr),tmp1 /* get final word ! */`
142			`vshd tmp2,tmp1,tmp3 /* position data !*/`
143			`uxor,sbz tmp3,r0,save /* if some-byte-zero */`
144			`b no_null /* don't goto no_null-find which null instead */`
145			`add d_addr,count,d_addr /* get d_addr ready for stbys,e */`
146			`extru,<> save,7,8,r0`
147			`b found_null5`
148			`copy r0, tmp5`
149			`extru,<> save,15,8,r0`
150			`b found_null5`
151			`ldil 0x1FE000,tmp5 /* setup mask (FF000000)*/`
152			`extru,<> save,23,8,r0`
153			`b found_null5`
154			`ldil 0x1FFFE0,tmp5 /* setup mask (FFFF0000)*/`
155			`ldo -1(r0),tmp5 /* setup mask (FFFFFFFF)*/`
156			`found_null5:`
157			`and tmp3,tmp5,tmp3 /* zero out tmp5 based on mask in tmp5*/`
158			`no_null:`
159			`bv 0(r2) /* were done*/`
160			`stbys,e tmp3,0(0,d_addr) /* store the data !*/`
161
162			`/* here we do ye old byte-at-a-time moves.*/`
163			`byteloop:`
164			`addibt,=,n 4,count,done`
165			`comb,= 0,s_addr,done`
166			`stbs r0,0(d_addr) /* store null in case s_addr == NULL */`
167			`ldbs,ma 1(s_addr),tmp1`
168			`encore:`
169			`combt,=,n tmp1,r0, pad_null_bytes1`
170			`stbs,ma tmp1,1(d_addr)`
171			`addibf,=,n -1,count,encore`
172			`ldbs,ma 1(s_addr),tmp1`
173			`b,n done`
174
175			`pnb_1:`
176			`addibt,=,n 4,count,done /* if count was already 0 then we're done*/`
177
178			`pad_null_bytes1:`
179			`combt,=,n count,r0,done /* if count==0 then exit */`
180			`pad_null_bytes2:`
181			`addibf,= -1,count,pad_null_bytes2`
182			`stbs,ma r0,1(d_addr)`
183			`b,n done`
184
185			`pad_nulls:`
186			`addibf,<=,n -4,count,pad_nulls`
187			`stwm r0,4(d_addr)`
188			`b,n pnb_1`
189
190
191			`null1:`
192			`extru,<> save,7,8,r0`
193			`b found_null1`
194			`copy r0, tmp5`
195			`extru,<> save,15,8,r0`
196			`b found_null1`
197			`ldil 0x1FE000,tmp5 /* setup mask (FF000000)*/`
198			`extru,<> save,23,8,r0`
199			`b found_null1`
200			`ldil 0x1FFFE0,tmp5 /* setup mask (FFFF0000)*/`
201			`ldo -1(r0),tmp5 /* setup mask (FFFFFFFF)*/`
202			`found_null1:`
203			`and tmp1,tmp5,tmp1 /zero out tmp1 according to mask/`
204			`b pad_nulls /* nullify remaining count bytes*/`
205			`stbys,b,m tmp1,4(0,d_addr) /* first word (account for alignment)*/`
206
207
208			`null2: /* back porch case. We have less than 4 bytes to go.*/`
209			`extru,<> save,7,8,r0 /* is null in 1st byte? */`
210			`b found_null2`
211			`copy r0, tmp5`
212			`extru,<> save,15,8,r0 /* is null in 2nd byte? */`
213			`b found_null2`
214			`ldil 0x1FE000,tmp5 /* setup mask (FF000000)*/`
215			`b found_null2 /* null must be in 3rd byte */`
216			`ldil 0x1FFFE0,tmp5 /* setup mask (FFFF0000)*/`
217			`found_null2:`
218			`and tmp1,tmp5,tmp1 /zero out tmp1 according to mask/`
219			`bv 0(r2) /* we're done*/`
220			`stbys,e tmp1,0(0,d_addr) /* last word (back porch)*/`
221
222			`null3: /* not_aligned case where null is found in first of two words--adjust count*/`
223			`extru,<> save,7,8,r0`
224			`b found_null3`
225			`copy r0, tmp5`
226			`extru,<> save,15,8,r0`
227			`b found_null3`
228			`ldil 0x1FE000,tmp5 /* setup mask (FF000000)*/`
229			`extru,<> save,23,8,r0`
230			`b found_null3`
231			`ldil 0x1FFFE0,tmp5 /* setup mask (FFFF0000)*/`
232			`ldo -1(r0),tmp5 /* setup mask (FFFFFFFF)*/`
233			`found_null3:`
234			`addi 4,count,count /* fix count since null is in first of two words*/`
235			`and tmp3,tmp5,tmp3 /zero out tmp3 according to mask/`
236			`b pad_nulls /* nullify remaining count bytes*/`
237			`stbys,b,m tmp3,4(d_addr)`
238
239			`null4: /* not_aligned case where null is found in second of two words*/`
240			`extru,<> save,7,8,r0`
241			`b found_null4`
242			`copy r0, tmp5`
243			`extru,<> save,15,8,r0`
244			`b found_null4`
245			`ldil 0x1FE000,tmp5 /* setup mask (FF000000)*/`
246			`extru,<> save,23,8,r0`
247			`b found_null4`
248			`ldil 0x1FFFE0,tmp5 /* setup mask (FFFF0000)*/`
249			`ldo -1(r0),tmp5 /* setup mask (FFFFFFFF)*/`
250			`found_null4:`
251			`and tmp3,tmp5,tmp3 /zero out tmp4 according to mask/`
252			`b pad_nulls /* nullify remaining count bytes*/`
253			`stbys,b,m tmp3,4(d_addr)`
254
255			`done:`
256			`EXIT(strncpy)`