nptl/sysdeps/unix/sysv/linux/i386/sysdep-cancel.h

   1 /* Copyright (C) 2002-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Jakub Jelinek <jakub@redhat.com>, 2002.
   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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdep.h>
  20 #include <tls.h>
  21 #ifndef __ASSEMBLER__
  22 # include <nptl/pthreadP.h>
  23 #endif
  24
  25 #if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
  26
  27 # undef PSEUDO
  28 # define PSEUDO(name, syscall_name, args)                                     \
  29   .text;                                                                      \
  30   ENTRY (name)                                                                \
  31     cmpl $0, %gs:MULTIPLE_THREADS_OFFSET;                                     \
  32     jne L(pseudo_cancel);                                                     \
  33   .type __##syscall_name##_nocancel,@function;                                \
  34   .globl __##syscall_name##_nocancel;                                         \
  35   __##syscall_name##_nocancel:                                                \
  36     DO_CALL (syscall_name, args);                                             \
  37     cmpl $-4095, %eax;                                                        \
  38     jae SYSCALL_ERROR_LABEL;                                                  \
  39     ret;                                                                      \
  40   .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel;            \
  41   L(pseudo_cancel):                                                           \
  42     CENABLE                                                                   \
  43     SAVE_OLDTYPE_##args                                                       \
  44     PUSHCARGS_##args                                                          \
  45     DOCARGS_##args                                                            \
  46     movl $SYS_ify (syscall_name), %eax;                                       \
  47     ENTER_KERNEL;                                                             \
  48     POPCARGS_##args;                                                          \
  49     POPSTATE_##args                                                           \
  50     cmpl $-4095, %eax;                                                        \
  51     jae SYSCALL_ERROR_LABEL
  52
  53 # define SAVE_OLDTYPE_0 movl %eax, %ecx;
  54 # define SAVE_OLDTYPE_1 SAVE_OLDTYPE_0
  55 # define SAVE_OLDTYPE_2 pushl %eax; cfi_adjust_cfa_offset (4);
  56 # define SAVE_OLDTYPE_3 SAVE_OLDTYPE_2
  57 # define SAVE_OLDTYPE_4 SAVE_OLDTYPE_2
  58 # define SAVE_OLDTYPE_5 SAVE_OLDTYPE_2
  59 # define SAVE_OLDTYPE_6 SAVE_OLDTYPE_2
  60
  61 # define PUSHCARGS_0    /* No arguments to push.  */
  62 # define DOCARGS_0      /* No arguments to frob.  */
  63 # define POPCARGS_0     /* No arguments to pop.  */
  64 # define _PUSHCARGS_0   /* No arguments to push.  */
  65 # define _POPCARGS_0    /* No arguments to pop.  */
  66
  67 # define PUSHCARGS_1    movl %ebx, %edx; cfi_register (ebx, edx); PUSHCARGS_0
  68 # define DOCARGS_1      _DOARGS_1 (4)
  69 # define POPCARGS_1     POPCARGS_0; movl %edx, %ebx; cfi_restore (ebx);
  70 # define _PUSHCARGS_1   pushl %ebx; cfi_adjust_cfa_offset (4); \
  71                         cfi_rel_offset (ebx, 0); _PUSHCARGS_0
  72 # define _POPCARGS_1    _POPCARGS_0; popl %ebx; \
  73                         cfi_adjust_cfa_offset (-4); cfi_restore (ebx);
  74
  75 # define PUSHCARGS_2    PUSHCARGS_1
  76 # define DOCARGS_2      _DOARGS_2 (12)
  77 # define POPCARGS_2     POPCARGS_1
  78 # define _PUSHCARGS_2   _PUSHCARGS_1
  79 # define _POPCARGS_2    _POPCARGS_1
  80
  81 # define PUSHCARGS_3    _PUSHCARGS_2
  82 # define DOCARGS_3      _DOARGS_3 (20)
  83 # define POPCARGS_3     _POPCARGS_3
  84 # define _PUSHCARGS_3   _PUSHCARGS_2
  85 # define _POPCARGS_3    _POPCARGS_2
  86
  87 # define PUSHCARGS_4    _PUSHCARGS_4
  88 # define DOCARGS_4      _DOARGS_4 (28)
  89 # define POPCARGS_4     _POPCARGS_4
  90 # define _PUSHCARGS_4   pushl %esi; cfi_adjust_cfa_offset (4); \
  91                         cfi_rel_offset (esi, 0); _PUSHCARGS_3
  92 # define _POPCARGS_4    _POPCARGS_3; popl %esi; \
  93                         cfi_adjust_cfa_offset (-4); cfi_restore (esi);
  94
  95 # define PUSHCARGS_5    _PUSHCARGS_5
  96 # define DOCARGS_5      _DOARGS_5 (36)
  97 # define POPCARGS_5     _POPCARGS_5
  98 # define _PUSHCARGS_5   pushl %edi; cfi_adjust_cfa_offset (4); \
  99                         cfi_rel_offset (edi, 0); _PUSHCARGS_4
 100 # define _POPCARGS_5    _POPCARGS_4; popl %edi; \
 101                         cfi_adjust_cfa_offset (-4); cfi_restore (edi);
 102
 103 # define PUSHCARGS_6    _PUSHCARGS_6
 104 # define DOCARGS_6      _DOARGS_6 (44)
 105 # define POPCARGS_6     _POPCARGS_6
 106 # define _PUSHCARGS_6   pushl %ebp; cfi_adjust_cfa_offset (4); \
 107                         cfi_rel_offset (ebp, 0); _PUSHCARGS_5
 108 # define _POPCARGS_6    _POPCARGS_5; popl %ebp; \
 109                         cfi_adjust_cfa_offset (-4); cfi_restore (ebp);
 110
 111 # ifdef IS_IN_libpthread
 112 #  define CENABLE       call __pthread_enable_asynccancel;
 113 #  define CDISABLE      call __pthread_disable_asynccancel
 114 # elif !defined NOT_IN_libc
 115 #  define CENABLE       call __libc_enable_asynccancel;
 116 #  define CDISABLE      call __libc_disable_asynccancel
 117 # elif defined IS_IN_librt
 118 #  define CENABLE       call __librt_enable_asynccancel;
 119 #  define CDISABLE      call __librt_disable_asynccancel
 120 # else
 121 #  error Unsupported library
 122 # endif
 123 # define POPSTATE_0 \
 124  pushl %eax; cfi_adjust_cfa_offset (4); movl %ecx, %eax; \
 125  CDISABLE; popl %eax; cfi_adjust_cfa_offset (-4);
 126 # define POPSTATE_1     POPSTATE_0
 127 # define POPSTATE_2     xchgl (%esp), %eax; CDISABLE; popl %eax; \
 128                         cfi_adjust_cfa_offset (-4);
 129 # define POPSTATE_3     POPSTATE_2
 130 # define POPSTATE_4     POPSTATE_3
 131 # define POPSTATE_5     POPSTATE_4
 132 # define POPSTATE_6     POPSTATE_5
 133
 134 # ifndef __ASSEMBLER__
 135 #  define SINGLE_THREAD_P \
 136   __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
 137                                    header.multiple_threads) == 0, 1)
 138 # else
 139 #  define SINGLE_THREAD_P cmpl $0, %gs:MULTIPLE_THREADS_OFFSET
 140 # endif
 141
 142 #elif !defined __ASSEMBLER__
 143
 144 # define SINGLE_THREAD_P (1)
 145 # define NO_CANCELLATION 1
 146
 147 #endif
 148
 149 #ifndef __ASSEMBLER__
 150 # define RTLD_SINGLE_THREAD_P \
 151   __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
 152                                    header.multiple_threads) == 0, 1)
 153 #endif