about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/m68k/sysdep-cancel.h
blob: 33ce922b2f3add52c2bb4116a83dbd09cb9575d8 (plain) (blame)
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) 2010-2014 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 !defined NOT_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 !defined NOT_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