(__vfork): Branch to __fork whenever libpthread.so is loaded.
[kopensolaris-gnu/glibc.git] / linuxthreads / sysdeps / unix / sysv / linux / s390 / s390-32 / sysdep-cancel.h
1 /* Copyright (C) 2003 Free Software Foundation, Inc.
2    This file is part of the GNU C Library.
3    Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
4
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, write to the Free
17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18    02111-1307 USA.  */
19
20 #include <sysdep.h>
21 #include <tls.h>
22 #ifndef __ASSEMBLER__
23 # include <linuxthreads/internals.h>
24 #endif
25
26 #if !defined NOT_IN_libc || defined IS_IN_libpthread
27
28 # undef PSEUDO
29 # define PSEUDO(name, syscall_name, args)                                     \
30         .text;                                                                \
31 L(pseudo_cancel):                                                             \
32         STM_##args                                                            \
33         stm     %r12,%r15,48(%r15);                                           \
34         lr      %r14,%r15;                                                    \
35         ahi     %r15,-96;                                                     \
36         st      %r14,0(%r15);                                                 \
37         basr    %r13,0;                                                       \
38 0:      l       %r1,1f-0b(%r13);                                              \
39         bas     %r14,0(%r1,%r13);                                             \
40         lr      %r0,%r2;                                                      \
41         LM_##args                                                             \
42         DO_CALL(syscall_name, args);                                          \
43         l       %r1,2f-0b(%r13);                                              \
44         lr      %r12,%r2;                                                     \
45         lr      %r2,%r0;                                                      \
46         bas     %r14,0(%r1,%r13);                                             \
47         lr      %r2,%r12;                                                     \
48         lm      %r12,%r15,48+96(%r15);                                        \
49         j       L(pseudo_check);                                              \
50 1:      .long   CENABLE-0b;                                                   \
51 2:      .long   CDISABLE-0b;                                                  \
52 ENTRY(name)                                                                   \
53         SINGLE_THREAD_P(%r1)                                                  \
54         jne     L(pseudo_cancel);                                             \
55         DO_CALL(syscall_name, args);                                          \
56 L(pseudo_check):                                                              \
57         lhi     %r4,-4095;                                                    \
58         clr     %r2,%r4;                                                      \
59         jnl     SYSCALL_ERROR_LABEL;                                          \
60 L(pseudo_end):
61
62 # ifdef IS_IN_libpthread
63 #  define CENABLE       __pthread_enable_asynccancel
64 #  define CDISABLE      __pthread_disable_asynccancel
65 # else
66 #  define CENABLE       __libc_enable_asynccancel
67 #  define CDISABLE      __libc_disable_asynccancel
68 # endif
69
70 #define STM_0           /* Nothing */
71 #define STM_1           st %r2,8(%r15);
72 #define STM_2           stm %r2,%r3,8(%r15);
73 #define STM_3           stm %r2,%r4,8(%r15);
74 #define STM_4           stm %r2,%r5,8(%r15);
75 #define STM_5           stm %r2,%r5,8(%r15);
76
77 #define LM_0            /* Nothing */
78 #define LM_1            l %r2,8+96(%r15);
79 #define LM_2            lm %r2,%r3,8+96(%r15);
80 #define LM_3            lm %r2,%r4,8+96(%r15);
81 #define LM_4            lm %r2,%r5,8+96(%r15);
82 #define LM_5            lm %r2,%r5,8+96(%r15);
83
84 # ifndef __ASSEMBLER__
85 #  define SINGLE_THREAD_P \
86   __builtin_expect (THREAD_GETMEM (THREAD_SELF,                               \
87                                    p_header.data.multiple_threads) == 0, 1)
88 # else
89 #  define SINGLE_THREAD_P(reg) \
90         ear     reg,%a0;                                                      \
91         icm     reg,15,MULTIPLE_THREADS_OFFSET(reg);
92 # endif
93
94 #elif !defined __ASSEMBLER__
95
96 /* This code should never be used but we define it anyhow.  */
97 # define SINGLE_THREAD_P (1)
98
99 #endif