about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/nios2/sysdep-cancel.h
blob: e2c70ba970ff5eadaeda03606cab22b9b3ad6de2 (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
139
140
141
/* Assembler macros with cancellation support, Nios II version.
   Copyright (C) 2003-2015 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)

# undef PSEUDO
# define PSEUDO(name, syscall_name, args)				      \
  .type __##syscall_name##_nocancel, @function;				      \
  .globl __##syscall_name##_nocancel;					      \
  __##syscall_name##_nocancel:						      \
    cfi_startproc;                                                            \
    DO_CALL (syscall_name, args);                                             \
    bne r7, zero, SYSCALL_ERROR_LABEL;                                        \
    ret;                                                                      \
    cfi_endproc;                                                              \
  .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel;	      \
  ENTRY (name)								      \
    SINGLE_THREAD_P(r2);						      \
    bne r2, zero, pseudo_cancel;					      \
    DO_CALL (syscall_name, args);					      \
    bne r7, zero, SYSCALL_ERROR_LABEL;                                        \
    ret;								      \
  pseudo_cancel:							      \
    SAVESTK_##args;                 /* save syscall args and adjust stack */  \
    SAVEREG(ra, 0);                     /* save return address */             \
    SAVEREG(r22, 4);                    /* save GOT pointer */                \
    nextpc r22;                                                               \
1:  movhi r2, %hiadj(_gp_got - 1b);					      \
    addi r2, r2, %lo(_gp_got - 1b);					      \
    add r22, r22, r2;                                                         \
    CENABLE;                                                                  \
    callr r3;                                                                 \
    stw r2, 8(sp);                      /* save mask */                       \
    LOADARGS_##args;                                                          \
    movi r2, SYS_ify(syscall_name);                                           \
    trap;                                                                     \
    stw r2, 12(sp);                     /* save syscall result */             \
    stw r7, 16(sp);                     /* save syscall error flag */         \
    ldw r4, 8(sp);                      /* pass mask as argument 1 */         \
    CDISABLE;                                                                 \
    callr r3;                                                                 \
    ldw r7, 16(sp);                     /* restore syscall error flag */      \
    ldw r2, 12(sp);                     /* restore syscall result */          \
    ldw ra, 0(sp);                      /* restore return address */          \
    ldw r22, 4(sp);                     /* restore GOT pointer */             \
    RESTORESTK_##args;                                                        \
    bne r7, zero, SYSCALL_ERROR_LABEL;


# undef PSEUDO_END
# define PSEUDO_END(sym) \
  SYSCALL_ERROR_HANDLER \
  END (sym)

#define SAVEREG(REG, LOC) stw REG, LOC(sp); cfi_rel_offset (REG, LOC)
#define SAVESTK(X) subi sp, sp, X; cfi_adjust_cfa_offset(X)
#define SAVESTK_0 SAVESTK(20)
#define SAVEARG_1 SAVEREG(r4, 20)
#define SAVESTK_1 SAVESTK(24); SAVEARG_1
#define SAVEARG_2 SAVEREG(r5, 24); SAVEARG_1
#define SAVESTK_2 SAVESTK(28); SAVEARG_2
#define SAVEARG_3 SAVEREG(r6, 28); SAVEARG_2
#define SAVESTK_3 SAVESTK(32); SAVEARG_3
#define SAVEARG_4 SAVEREG(r7, 32); SAVEARG_3
#define SAVESTK_4 SAVESTK(36); SAVEARG_4
#define SAVESTK_5 SAVESTK_4
#define SAVESTK_6 SAVESTK_5

#define LOADARGS_0
#define LOADARGS_1 ldw r4, 20(sp)
#define LOADARGS_2 LOADARGS_1; ldw r5, 24(sp)
#define LOADARGS_3 LOADARGS_2; ldw r6, 28(sp)
#define LOADARGS_4 LOADARGS_3; ldw r7, 32(sp)
#define LOADARGS_5 LOADARGS_4; ldw r8, 36(sp)
#define LOADARGS_6 LOADARGS_5; ldw r9, 40(sp)

#define RESTORESTK(X) addi sp, sp, X; cfi_adjust_cfa_offset(-X)
#define RESTORESTK_0 RESTORESTK(20)
#define RESTORESTK_1 RESTORESTK(24)
#define RESTORESTK_2 RESTORESTK(28)
#define RESTORESTK_3 RESTORESTK(32)
#define RESTORESTK_4 RESTORESTK(36)
#define RESTORESTK_5 RESTORESTK(36)
#define RESTORESTK_6 RESTORESTK(36)

# if IS_IN (libpthread)
#  define CENABLE	ldw r3, %call(__pthread_enable_asynccancel)(r22)
#  define CDISABLE	ldw r3, %call(__pthread_disable_asynccancel)(r22)
# elif IS_IN (librt)
#  define CENABLE	ldw r3, %call(__librt_enable_asynccancel)(r22)
#  define CDISABLE	ldw r3, %call(__librt_disable_asynccancel)(r22)
# elif IS_IN (libc)
#  define CENABLE	ldw r3, %call(__libc_enable_asynccancel)(r22)
#  define CDISABLE	ldw r3, %call(__libc_disable_asynccancel)(r22)
# 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(reg)						\
	ldw reg, MULTIPLE_THREADS_OFFSET(r23)
#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