about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/mips/sysdep-cancel.h
blob: 0e45f00242e565316a9d26a7e45e843b4c2af03f (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
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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
/* 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 <sysdeps/generic/sysdep.h>
#include <tls.h>
#ifndef __ASSEMBLER__
# include <nptl/pthreadP.h>
#endif

#if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt)

# ifdef __PIC__
#  define PSEUDO_CPLOAD .cpload t9;
#  define PSEUDO_ERRJMP la t9, __syscall_error; jr t9;
#  define PSEUDO_SAVEGP sw gp, 32(sp); cfi_rel_offset (gp, 32);
#  define PSEUDO_LOADGP lw gp, 32(sp);
# else
#  define PSEUDO_CPLOAD
#  define PSEUDO_ERRJMP j __syscall_error;
#  define PSEUDO_SAVEGP
#  define PSEUDO_LOADGP
# endif

# undef PSEUDO
# define PSEUDO(name, syscall_name, args)				      \
      .align 2;								      \
      .set nomips16;							      \
  L(pseudo_start):							      \
      cfi_startproc;							      \
  99: PSEUDO_ERRJMP							      \
  .type __##syscall_name##_nocancel, @function;				      \
  .globl __##syscall_name##_nocancel;					      \
  __##syscall_name##_nocancel:						      \
    .set noreorder;							      \
    PSEUDO_CPLOAD							      \
    li v0, SYS_ify(syscall_name);					      \
    syscall;								      \
    .set reorder;							      \
    bne a3, zero, 99b;					       		      \
    ret;								      \
    cfi_endproc;							      \
  .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel;	      \
  ENTRY (name)								      \
    .set noreorder;							      \
    PSEUDO_CPLOAD							      \
    .set reorder;							      \
    SINGLE_THREAD_P(v1);						      \
    bne zero, v1, L(pseudo_cancel);					      \
    .set noreorder;							      \
    li v0, SYS_ify(syscall_name);					      \
    syscall;								      \
    .set reorder;							      \
    bne a3, zero, 99b;					       		      \
    ret;								      \
  L(pseudo_cancel):							      \
    SAVESTK_##args;						              \
    sw ra, 28(sp);							      \
    cfi_rel_offset (ra, 28);						      \
    PSEUDO_SAVEGP							      \
    PUSHARGS_##args;			/* save syscall args */	      	      \
    CENABLE;								      \
    PSEUDO_LOADGP							      \
    sw v0, 44(sp);			/* save mask */			      \
    POPARGS_##args;			/* restore syscall args */	      \
    .set noreorder;							      \
    li v0, SYS_ify (syscall_name);				      	      \
    syscall;								      \
    .set reorder;							      \
    sw v0, 36(sp);			/* save syscall result */             \
    sw a3, 40(sp);			/* save syscall error flag */	      \
    lw a0, 44(sp);			/* pass mask as arg1 */		      \
    CDISABLE;								      \
    PSEUDO_LOADGP							      \
    lw v0, 36(sp);			/* restore syscall result */          \
    lw a3, 40(sp);			/* restore syscall error flag */      \
    lw ra, 28(sp);			/* restore return address */	      \
    .set noreorder;							      \
    bne a3, zero, 99b;							      \
     RESTORESTK;						              \
  L(pseudo_end):							      \
    .set reorder;

# undef PSEUDO_END
# define PSEUDO_END(sym) cfi_endproc; .end sym; .size sym,.-sym

# define PUSHARGS_0	/* nothing to do */
# define PUSHARGS_1	PUSHARGS_0 sw a0, 0(sp); cfi_rel_offset (a0, 0);
# define PUSHARGS_2	PUSHARGS_1 sw a1, 4(sp); cfi_rel_offset (a1, 4);
# define PUSHARGS_3	PUSHARGS_2 sw a2, 8(sp); cfi_rel_offset (a2, 8);
# define PUSHARGS_4	PUSHARGS_3 sw a3, 12(sp); cfi_rel_offset (a3, 12);
# define PUSHARGS_5	PUSHARGS_4 /* handled by SAVESTK_## */
# define PUSHARGS_6	PUSHARGS_5
# define PUSHARGS_7	PUSHARGS_6

# define POPARGS_0	/* nothing to do */
# define POPARGS_1	POPARGS_0 lw a0, 0(sp);
# define POPARGS_2	POPARGS_1 lw a1, 4(sp);
# define POPARGS_3	POPARGS_2 lw a2, 8(sp);
# define POPARGS_4	POPARGS_3 lw a3, 12(sp);
# define POPARGS_5	POPARGS_4 /* args already in new stackframe */
# define POPARGS_6	POPARGS_5
# define POPARGS_7	POPARGS_6


# define STKSPACE	48
# define SAVESTK_0 	subu sp, STKSPACE; cfi_adjust_cfa_offset(STKSPACE)
# define SAVESTK_1      SAVESTK_0
# define SAVESTK_2      SAVESTK_1
# define SAVESTK_3      SAVESTK_2
# define SAVESTK_4      SAVESTK_3
# define SAVESTK_5      lw t0, 16(sp);		\
			SAVESTK_0;		\
			sw t0, 16(sp)

# define SAVESTK_6      lw t0, 16(sp);		\
			lw t1, 20(sp);		\
			SAVESTK_0;		\
			sw t0, 16(sp);		\
			sw t1, 20(sp)

# define SAVESTK_7      lw t0, 16(sp);		\
			lw t1, 20(sp);		\
			lw t2, 24(sp);		\
			SAVESTK_0;		\
			sw t0, 16(sp);		\
			sw t1, 20(sp);		\
			sw t2, 24(sp)

# define RESTORESTK 	addu sp, STKSPACE; cfi_adjust_cfa_offset(-STKSPACE)


# ifdef __PIC__
/* We use jalr rather than jal.  This means that the assembler will not
   automatically restore $gp (in case libc has multiple GOTs) so we must
   do it manually - which we have to do anyway since we don't use .cprestore.
   It also shuts up the assembler warning about not using .cprestore.  */
#  define PSEUDO_JMP(sym) la t9, sym; jalr t9;
# else
#  define PSEUDO_JMP(sym) jal sym;
# endif

# if IS_IN (libpthread)
#  define CENABLE	PSEUDO_JMP (__pthread_enable_asynccancel)
#  define CDISABLE	PSEUDO_JMP (__pthread_disable_asynccancel)
# elif IS_IN (librt)
#  define CENABLE	PSEUDO_JMP (__librt_enable_asynccancel)
#  define CDISABLE	PSEUDO_JMP (__librt_disable_asynccancel)
# else
#  define CENABLE	PSEUDO_JMP (__libc_enable_asynccancel)
#  define CDISABLE	PSEUDO_JMP (__libc_disable_asynccancel)
# endif

# ifndef __ASSEMBLER__
#  define SINGLE_THREAD_P						\
	__builtin_expect (THREAD_GETMEM (THREAD_SELF,			\
					 header.multiple_threads)	\
			  == 0, 1)
# else
#  define SINGLE_THREAD_P(reg)						\
	READ_THREAD_POINTER(reg);					\
	lw reg, MULTIPLE_THREADS_OFFSET(reg)
#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