Warning: That file was not part of the compilation database. It may have many parsing errors.

1/* Copyright (C) 1996-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Richard Henderson (rth@tamu.edu)
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <http://www.gnu.org/licenses/>. */
18
19/* Copy no more than COUNT bytes of the null-terminated string from
20 SRC to DST. If SRC does not cover all of COUNT, the balance is
21 zeroed. Return the address of the terminating null in DEST, if
22 any, else DEST + COUNT. */
23
24#include <sysdep.h>
25
26 .set noat
27 .set noreorder
28
29 .text
30
31ENTRY(__stpncpy)
32 ldgp gp, 0(pv)
33#ifdef PROF
34 lda AT, _mcount
35 jsr AT, (AT), _mcount
36#endif
37 .prologue 1
38
39 beq a2, $zerocount
40 jsr t9, __stxncpy # do the work of the copy
41
42 and t8, 0xf0, t3 # binary search for byte offset of the
43 and t8, 0xcc, t2 # last byte written.
44 and t8, 0xaa, t1
45 andnot a0, 7, v0
46 cmovne t3, 4, t3
47 cmovne t2, 2, t2
48 cmovne t1, 1, t1
49 addq v0, t3, v0
50 addq t1, t2, t1
51 addq v0, t1, v0
52
53 bne a2, $multiword # do we have full words left?
54
55 .align 3
56 zapnot t0, t8, t4 # e0 : was last byte a null?
57 subq t8, 1, t2 # .. e1 :
58 addq v0, 1, t5 # e0 :
59 subq t10, 1, t3 # .. e1 :
60 or t2, t8, t2 # e0 : clear the bits between the last
61 or t3, t10, t3 # .. e1 : written byte and the last byte in
62 andnot t3, t2, t3 # e0 : COUNT
63 cmovne t4, t5, v0 # .. e1 : if last written wasnt null, inc v0
64 zap t0, t3, t0 # e0 :
65 stq_u t0, 0(a0) # e1 :
66 ret # .. e1 :
67
68 .align 3
69$multiword:
70 subq t8, 1, t7 # e0 : clear the final bits in the prev
71 or t7, t8, t7 # e1 : word
72 zapnot t0, t7, t0 # e0 :
73 subq a2, 1, a2 # .. e1 :
74 stq_u t0, 0(a0) # e0 :
75 addq a0, 8, a0 # .. e1 :
76
77 beq a2, 1f # e1 :
78 blbc a2, 0f # e1 :
79
80 stq_u zero, 0(a0) # e0 : zero one word
81 subq a2, 1, a2 # .. e1 :
82 addq a0, 8, a0 # e0 :
83 beq a2, 1f # .. e1 :
84
850: stq_u zero, 0(a0) # e0 : zero two words
86 subq a2, 2, a2 # .. e1 :
87 stq_u zero, 8(a0) # e0 :
88 addq a0, 16, a0 # .. e1 :
89 bne a2, 0b # e1 :
90 unop
91
921: ldq_u t0, 0(a0) # e0 : clear the leading bits in the final
93 subq t10, 1, t7 # .. e1 : word
94 or t7, t10, t7 # e0 :
95 zap t0, t7, t0 # e1 (stall)
96 stq_u t0, 0(a0) # e0 :
97 ret # .. e1 :
98
99$zerocount:
100 mov a0, v0
101 ret
102
103 END(__stpncpy)
104
105libc_hidden_def (__stpncpy)
106weak_alias (__stpncpy, stpncpy)
107

Warning: That file was not part of the compilation database. It may have many parsing errors.