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
|
/* Copyright (C) 2010-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
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)
# undef PSEUDO
# define PSEUDO(name, syscall_name, args) \
.text; \
ENTRY (name) \
SINGLE_THREAD_P; \
jne .Lpseudo_cancel; \
.type __##syscall_name##_nocancel,@function; \
.globl __##syscall_name##_nocancel; \
__##syscall_name##_nocancel: \
DO_CALL (syscall_name, args); \
cmp.l &-4095, %d0; \
jcc SYSCALL_ERROR_LABEL; \
rts; \
.size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel; \
.Lpseudo_cancel: \
CENABLE; \
DOCARGS_##args \
move.l %d0, -(%sp); /* Save result of CENABLE. */ \
cfi_adjust_cfa_offset (4); \
move.l &SYS_ify (syscall_name), %d0; \
trap &0; \
move.l %d0, %d2; \
CDISABLE; \
addq.l &4, %sp; /* Remove result of CENABLE from the stack. */ \
cfi_adjust_cfa_offset (-4); \
move.l %d2, %d0; \
UNDOCARGS_##args \
cmp.l &-4095, %d0; \
jcc SYSCALL_ERROR_LABEL
/* Note: we use D2 to save syscall's return value as D0 will be clobbered in
CDISABLE. */
# define DOCARGS_0 move.l %d2, -(%sp); \
cfi_adjust_cfa_offset (4); cfi_rel_offset (%d2, 0);
# define UNDOCARGS_0 move.l (%sp)+, %d2; \
cfi_adjust_cfa_offset (-4); cfi_restore (%d2);
# define DOCARGS_1 _DOCARGS_1 (4); DOCARGS_0
# define _DOCARGS_1(n) move.l n(%sp), %d1;
# define UNDOCARGS_1 UNDOCARGS_0
# define DOCARGS_2 _DOCARGS_2 (8)
# define _DOCARGS_2(n) DOCARGS_0 move.l n+4(%sp), %d2; _DOCARGS_1 (n)
# define UNDOCARGS_2 UNDOCARGS_0
# define DOCARGS_3 _DOCARGS_3 (12)
# define _DOCARGS_3(n) move.l %d3, -(%sp); \
cfi_adjust_cfa_offset (4); cfi_rel_offset (%d3, 0); \
move.l n+4(%sp), %d3; _DOCARGS_2 (n)
# define UNDOCARGS_3 UNDOCARGS_2 move.l (%sp)+, %d3; \
cfi_adjust_cfa_offset (-4); cfi_restore (%d3);
# define DOCARGS_4 _DOCARGS_4 (16)
# define _DOCARGS_4(n) move.l %d4, -(%sp); \
cfi_adjust_cfa_offset (4); cfi_rel_offset (%d4, 0); \
move.l n+4(%sp), %d4; _DOCARGS_3 (n)
# define UNDOCARGS_4 UNDOCARGS_3 move.l (%sp)+, %d4; \
cfi_adjust_cfa_offset (-4); cfi_restore (%d4);
# define DOCARGS_5 _DOCARGS_5 (20)
# define _DOCARGS_5(n) move.l %d5, -(%sp); \
cfi_adjust_cfa_offset (4); cfi_rel_offset (%d5, 0); \
move.l n+4(%sp), %d5; _DOCARGS_4 (n)
# define UNDOCARGS_5 UNDOCARGS_4 move.l (%sp)+, %d5; \
cfi_adjust_cfa_offset (-4); cfi_restore (%d5);
# define DOCARGS_6 _DOCARGS_6 (24)
# define _DOCARGS_6(n) move.l n(%sp), %a0; _DOCARGS_5 (n-4)
# define UNDOCARGS_6 UNDOCARGS_5
# ifdef PIC
# define PSEUDO_JMP(sym) jbsr sym ## @PLTPC
# else
# define PSEUDO_JMP(sym) jbsr sym
# endif
# if IS_IN (libpthread)
# define CENABLE PSEUDO_JMP (__pthread_enable_asynccancel)
# define CDISABLE PSEUDO_JMP (__pthread_disable_asynccancel)
# elif IS_IN (libc)
# define CENABLE PSEUDO_JMP (__libc_enable_asynccancel)
# define CDISABLE PSEUDO_JMP (__libc_disable_asynccancel)
# elif IS_IN (librt)
# define CENABLE PSEUDO_JMP (__librt_enable_asynccancel)
# define CDISABLE PSEUDO_JMP (__librt_disable_asynccancel)
# 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 \
PSEUDO_JMP (__m68k_read_tp); \
tst.l MULTIPLE_THREADS_OFFSET(%a0)
# 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
|
