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
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/* Cancellable system call stubs. Linux/PowerPC64 version.
Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Franz Sirl <Franz.Sirl-kernel@lauterbach.com>, 2003.
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 <tls.h>
#ifndef __ASSEMBLER__
# include <nptl/pthreadP.h>
#endif
#if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt)
# define DASHDASHPFX(str) __##str
#if _CALL_ELF == 2
#define CANCEL_FRAMESIZE (FRAME_MIN_SIZE+16+48)
#define CANCEL_PARM_SAVE (FRAME_MIN_SIZE+16)
#else
#define CANCEL_FRAMESIZE (FRAME_MIN_SIZE+16)
#define CANCEL_PARM_SAVE (CANCEL_FRAMESIZE+FRAME_PARM_SAVE)
#endif
# undef PSEUDO
# define PSEUDO(name, syscall_name, args) \
.section ".text"; \
ENTRY (name) \
SINGLE_THREAD_P; \
bne- .Lpseudo_cancel; \
.type DASHDASHPFX(syscall_name##_nocancel),@function; \
.globl DASHDASHPFX(syscall_name##_nocancel); \
DASHDASHPFX(syscall_name##_nocancel): \
DO_CALL (SYS_ify (syscall_name)); \
PSEUDO_RET; \
.size DASHDASHPFX(syscall_name##_nocancel),.-DASHDASHPFX(syscall_name##_nocancel); \
.Lpseudo_cancel: \
stdu 1,-CANCEL_FRAMESIZE(1); \
cfi_adjust_cfa_offset (CANCEL_FRAMESIZE); \
mflr 9; \
std 9,CANCEL_FRAMESIZE+FRAME_LR_SAVE(1); \
cfi_offset (lr, FRAME_LR_SAVE); \
DOCARGS_##args; /* save syscall args around CENABLE. */ \
CENABLE; \
std 3,FRAME_MIN_SIZE(1); /* store CENABLE return value (MASK). */ \
UNDOCARGS_##args; /* restore syscall args. */ \
DO_CALL (SYS_ify (syscall_name)); \
mfcr 0; /* save CR/R3 around CDISABLE. */ \
std 3,FRAME_MIN_SIZE+8(1); \
std 0,CANCEL_FRAMESIZE+FRAME_CR_SAVE(1); \
cfi_offset (cr, FRAME_CR_SAVE); \
ld 3,FRAME_MIN_SIZE(1); /* pass MASK to CDISABLE. */ \
CDISABLE; \
ld 9,CANCEL_FRAMESIZE+FRAME_LR_SAVE(1); \
ld 0,CANCEL_FRAMESIZE+FRAME_CR_SAVE(1); /* restore CR/R3. */ \
ld 3,FRAME_MIN_SIZE+8(1); \
mtlr 9; \
mtcr 0; \
addi 1,1,CANCEL_FRAMESIZE; \
cfi_adjust_cfa_offset (-CANCEL_FRAMESIZE); \
cfi_restore (lr); \
cfi_restore (cr)
# define DOCARGS_0
# define UNDOCARGS_0
# define DOCARGS_1 std 3,CANCEL_PARM_SAVE(1); DOCARGS_0
# define UNDOCARGS_1 ld 3,CANCEL_PARM_SAVE(1); UNDOCARGS_0
# define DOCARGS_2 std 4,CANCEL_PARM_SAVE+8(1); DOCARGS_1
# define UNDOCARGS_2 ld 4,CANCEL_PARM_SAVE+8(1); UNDOCARGS_1
# define DOCARGS_3 std 5,CANCEL_PARM_SAVE+16(1); DOCARGS_2
# define UNDOCARGS_3 ld 5,CANCEL_PARM_SAVE+16(1); UNDOCARGS_2
# define DOCARGS_4 std 6,CANCEL_PARM_SAVE+24(1); DOCARGS_3
# define UNDOCARGS_4 ld 6,CANCEL_PARM_SAVE+24(1); UNDOCARGS_3
# define DOCARGS_5 std 7,CANCEL_PARM_SAVE+32(1); DOCARGS_4
# define UNDOCARGS_5 ld 7,CANCEL_PARM_SAVE+32(1); UNDOCARGS_4
# define DOCARGS_6 std 8,CANCEL_PARM_SAVE+40(1); DOCARGS_5
# define UNDOCARGS_6 ld 8,CANCEL_PARM_SAVE+40(1); UNDOCARGS_5
# if IS_IN (libpthread)
# ifdef SHARED
# define CENABLE bl JUMPTARGET(__pthread_enable_asynccancel)
# define CDISABLE bl JUMPTARGET(__pthread_disable_asynccancel)
# else
# define CENABLE bl JUMPTARGET(__pthread_enable_asynccancel); nop
# define CDISABLE bl JUMPTARGET(__pthread_disable_asynccancel); nop
# endif
# elif IS_IN (libc)
# ifdef SHARED
# define CENABLE bl JUMPTARGET(__libc_enable_asynccancel)
# define CDISABLE bl JUMPTARGET(__libc_disable_asynccancel)
# else
# define CENABLE bl JUMPTARGET(__libc_enable_asynccancel); nop
# define CDISABLE bl JUMPTARGET(__libc_disable_asynccancel); nop
# endif
# elif IS_IN (librt)
# ifdef SHARED
# define CENABLE bl JUMPTARGET(__librt_enable_asynccancel)
# define CDISABLE bl JUMPTARGET(__librt_disable_asynccancel)
# else
# define CENABLE bl JUMPTARGET(__librt_enable_asynccancel); nop
# define CDISABLE bl JUMPTARGET(__librt_disable_asynccancel); nop
# endif
# else
# error Unsupported library
# endif
# ifndef __ASSEMBLER__
# define SINGLE_THREAD_P \
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
header.multiple_threads) == 0, 1)
# else
# define SINGLE_THREAD_P \
lwz 10,MULTIPLE_THREADS_OFFSET(13); \
cmpwi 10,0
# endif
#elif !defined __ASSEMBLER__
# define SINGLE_THREAD_P (1)
# define NO_CANCELLATION 1
#endif
#ifndef __ASSEMBLER__
# define RTLD_SINGLE_THREAD_P \
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
header.multiple_threads) == 0, 1)
#endif
|
