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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/* Copyright (C) 2003-2017 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 <tls.h>
#ifndef __ASSEMBLER__
# include <nptl/pthreadP.h>
#endif
#if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt)
/* ??? Assumes that nothing comes between PSEUDO and PSEUDO_END
besides "ret". */
# undef PSEUDO
# define PSEUDO(name, syscall_name, args) \
.globl __##syscall_name##_nocancel; \
.type __##syscall_name##_nocancel, @function; \
.usepv __##syscall_name##_nocancel, std; \
.align 4; \
cfi_startproc; \
__LABEL(__##syscall_name##_nocancel) \
ldgp gp, 0(pv); \
PSEUDO_PROF; \
__LABEL($pseudo_nocancel) \
PSEUDO_PREPARE_ARGS; \
lda v0, SYS_ify(syscall_name); \
call_pal PAL_callsys; \
bne a3, SYSCALL_ERROR_LABEL; \
__LABEL($pseudo_ret) \
.subsection 2; \
.size __##syscall_name##_nocancel, .-__##syscall_name##_nocancel; \
.globl name; \
.type name, @function; \
.usepv name, std; \
.align 4; \
cfi_startproc; \
__LABEL(name) \
ldgp gp, 0(pv); \
PSEUDO_PROF; \
SINGLE_THREAD_P(t0); \
beq t0, $pseudo_nocancel; \
subq sp, 64, sp; \
cfi_def_cfa_offset(64); \
stq ra, 0(sp); \
cfi_offset(ra, -64); \
SAVE_ARGS_##args; \
CENABLE; \
LOAD_ARGS_##args; \
/* Save the CENABLE return value in RA. That register \
is preserved across syscall and the real return \
address is saved on the stack. */ \
mov v0, ra; \
lda v0, SYS_ify(syscall_name); \
call_pal PAL_callsys; \
stq v0, 8(sp); \
mov ra, a0; \
bne a3, $multi_error; \
CDISABLE; \
ldq ra, 0(sp); \
ldq v0, 8(sp); \
addq sp, 64, sp; \
cfi_remember_state; \
cfi_restore(ra); \
cfi_def_cfa_offset(0); \
ret; \
cfi_restore_state; \
__LABEL($multi_error) \
CDISABLE; \
ldq ra, 0(sp); \
ldq v0, 8(sp); \
addq sp, 64, sp; \
cfi_restore(ra); \
cfi_def_cfa_offset(0); \
SYSCALL_ERROR_FALLTHRU; \
SYSCALL_ERROR_HANDLER; \
cfi_endproc; \
.previous
# undef PSEUDO_END
# define PSEUDO_END(sym) \
cfi_endproc; \
.subsection 2; \
.size sym, .-sym
# define SAVE_ARGS_0 /* Nothing. */
# define SAVE_ARGS_1 SAVE_ARGS_0; stq a0, 8(sp)
# define SAVE_ARGS_2 SAVE_ARGS_1; stq a1, 16(sp)
# define SAVE_ARGS_3 SAVE_ARGS_2; stq a2, 24(sp)
# define SAVE_ARGS_4 SAVE_ARGS_3; stq a3, 32(sp)
# define SAVE_ARGS_5 SAVE_ARGS_4; stq a4, 40(sp)
# define SAVE_ARGS_6 SAVE_ARGS_5; stq a5, 48(sp)
# define LOAD_ARGS_0 /* Nothing. */
# define LOAD_ARGS_1 LOAD_ARGS_0; ldq a0, 8(sp)
# define LOAD_ARGS_2 LOAD_ARGS_1; ldq a1, 16(sp)
# define LOAD_ARGS_3 LOAD_ARGS_2; ldq a2, 24(sp)
# define LOAD_ARGS_4 LOAD_ARGS_3; ldq a3, 32(sp)
# define LOAD_ARGS_5 LOAD_ARGS_4; ldq a4, 40(sp)
# define LOAD_ARGS_6 LOAD_ARGS_5; ldq a5, 48(sp)
# if IS_IN (libpthread)
# define __local_enable_asynccancel __pthread_enable_asynccancel
# define __local_disable_asynccancel __pthread_disable_asynccancel
# define __local_multiple_threads __pthread_multiple_threads
# elif IS_IN (libc)
# define __local_enable_asynccancel __libc_enable_asynccancel
# define __local_disable_asynccancel __libc_disable_asynccancel
# define __local_multiple_threads __libc_multiple_threads
# elif IS_IN (librt)
# define __local_enable_asynccancel __librt_enable_asynccancel
# define __local_disable_asynccancel __librt_disable_asynccancel
# else
# error Unsupported library
# endif
# ifdef PIC
# define CENABLE bsr ra, __local_enable_asynccancel !samegp
# define CDISABLE bsr ra, __local_disable_asynccancel !samegp
# else
# define CENABLE jsr ra, __local_enable_asynccancel; ldgp ra, 0(gp)
# define CDISABLE jsr ra, __local_disable_asynccancel; ldgp ra, 0(gp)
# endif
# if IS_IN (libpthread) || IS_IN (libc)
# ifndef __ASSEMBLER__
extern int __local_multiple_threads attribute_hidden;
# define SINGLE_THREAD_P \
__builtin_expect (__local_multiple_threads == 0, 1)
# elif defined(PIC)
# define SINGLE_THREAD_P(reg) ldl reg, __local_multiple_threads(gp) !gprel
# else
# define SINGLE_THREAD_P(reg) \
ldah reg, __local_multiple_threads(gp) !gprelhigh; \
ldl reg, __local_multiple_threads(reg) !gprellow
# endif
# else
# ifndef __ASSEMBLER__
# define SINGLE_THREAD_P \
__builtin_expect (THREAD_GETMEM (THREAD_SELF, \
header.multiple_threads) == 0, 1)
# else
# define SINGLE_THREAD_P(reg) \
call_pal PAL_rduniq; \
ldl reg, MULTIPLE_THREADS_OFFSET($0)
# endif
# endif
#else
# 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
|
