1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
/* Optimized stpcpy implementation for PowerPC.
Copyright (C) 1997-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <bp-sym.h>
#include <bp-asm.h>
/* See strlen.s for comments on how the end-of-string testing works. */
/* char * [r3] stpcpy (char *dest [r3], const char *src [r4]) */
EALIGN (BP_SYM (__stpcpy), 4, 0)
#define rTMP r0
#define rRTN r3
#if __BOUNDED_POINTERS__
# define rDEST r4 /* pointer to previous word in dest */
# define rSRC r5 /* pointer to previous word in src */
# define rLOW r11
# define rHIGH r12
#else
# define rDEST r3 /* pointer to previous word in dest */
# define rSRC r4 /* pointer to previous word in src */
#endif
#define rWORD r6 /* current word from src */
#define rFEFE r7 /* 0xfefefeff */
#define r7F7F r8 /* 0x7f7f7f7f */
#define rNEG r9 /* ~(word in src | 0x7f7f7f7f) */
#define rALT r10 /* alternate word from src */
CHECK_BOUNDS_LOW (rSRC, rLOW, rHIGH)
CHECK_BOUNDS_LOW (rDEST, rLOW, rHIGH)
STORE_RETURN_BOUNDS (rLOW, rHIGH)
or rTMP, rSRC, rDEST
clrlwi. rTMP, rTMP, 30
addi rDEST, rDEST, -4
bne L(unaligned)
lis rFEFE, -0x101
lis r7F7F, 0x7f7f
lwz rWORD, 0(rSRC)
addi rFEFE, rFEFE, -0x101
addi r7F7F, r7F7F, 0x7f7f
b L(g2)
L(g0): lwzu rALT, 4(rSRC)
stwu rWORD, 4(rDEST)
add rTMP, rFEFE, rALT
nor rNEG, r7F7F, rALT
and. rTMP, rTMP, rNEG
bne- L(g1)
lwzu rWORD, 4(rSRC)
stwu rALT, 4(rDEST)
L(g2): add rTMP, rFEFE, rWORD
nor rNEG, r7F7F, rWORD
and. rTMP, rTMP, rNEG
beq+ L(g0)
mr rALT, rWORD
/* We've hit the end of the string. Do the rest byte-by-byte. */
L(g1): rlwinm. rTMP, rALT, 8, 24, 31
stbu rTMP, 4(rDEST)
beqlr-
rlwinm. rTMP, rALT, 16, 24, 31
stbu rTMP, 1(rDEST)
beqlr-
rlwinm. rTMP, rALT, 24, 24, 31
stbu rTMP, 1(rDEST)
beqlr-
stbu rALT, 1(rDEST)
CHECK_BOUNDS_HIGH (rDEST, rHIGH, twlgt)
STORE_RETURN_VALUE (rDEST)
blr
/* Oh well. In this case, we just do a byte-by-byte copy. */
.align 4
nop
L(unaligned):
lbz rWORD, 0(rSRC)
addi rDEST, rDEST, 3
cmpwi rWORD, 0
beq- L(u2)
L(u0): lbzu rALT, 1(rSRC)
stbu rWORD, 1(rDEST)
cmpwi rALT, 0
beq- L(u1)
nop /* Let 601 load start of loop. */
lbzu rWORD, 1(rSRC)
stbu rALT, 1(rDEST)
cmpwi rWORD, 0
bne+ L(u0)
L(u2): stbu rWORD, 1(rDEST)
CHECK_BOUNDS_HIGH (rDEST, rHIGH, twlgt)
STORE_RETURN_VALUE (rDEST)
blr
L(u1): stbu rALT, 1(rDEST)
CHECK_BOUNDS_HIGH (rDEST, rHIGH, twlgt)
STORE_RETURN_VALUE (rDEST)
blr
END (BP_SYM (__stpcpy))
weak_alias (BP_SYM (__stpcpy), BP_SYM (stpcpy))
libc_hidden_def (__stpcpy)
libc_hidden_builtin_def (stpcpy)
|
