nptl/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep-cancel.h

   1 /* Cancellable system call stubs.  Linux/PowerPC version.
   2    Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Franz Sirl <Franz.Sirl-kernel@lauterbach.com>, 2003.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA
  19    02110-1301 USA.  */
  20
  21 #include <sysdep.h>
  22 #include <tls.h>
  23 #ifndef __ASSEMBLER__
  24 # include <nptl/pthreadP.h>
  25 #endif
  26
  27 #if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
  28
  29 # undef PSEUDO
  30 # define PSEUDO(name, syscall_name, args)                               \
  31   .section ".text";                                                     \
  32   ENTRY (name)                                                          \
  33     SINGLE_THREAD_P;                                                    \
  34     bne- .Lpseudo_cancel;                                               \
  35   .type __##syscall_name##_nocancel,@function;                          \
  36   .globl __##syscall_name##_nocancel;                                   \
  37   __##syscall_name##_nocancel:                                          \
  38     DO_CALL (SYS_ify (syscall_name));                                   \
  39     PSEUDO_RET;                                                         \
  40   .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel;      \
  41   .Lpseudo_cancel:                                                      \
  42     stwu 1,-48(1);                                                      \
  43     cfi_adjust_cfa_offset (48);                                         \
  44     mflr 9;                                                             \
  45     stw 9,52(1);                                                        \
  46     cfi_offset (lr, 4);                                                 \
  47     DOCARGS_##args;     /* save syscall args around CENABLE.  */        \
  48     CENABLE;                                                            \
  49     stw 3,16(1);        /* store CENABLE return value (MASK).  */       \
  50     UNDOCARGS_##args;   /* restore syscall args.  */                    \
  51     DO_CALL (SYS_ify (syscall_name));                                   \
  52     mfcr 0;             /* save CR/R3 around CDISABLE.  */              \
  53     stw 3,8(1);                                                         \
  54     stw 0,12(1);                                                        \
  55     lwz 3,16(1);        /* pass MASK to CDISABLE.  */                   \
  56     CDISABLE;                                                           \
  57     lwz 4,52(1);                                                        \
  58     lwz 0,12(1);        /* restore CR/R3. */                            \
  59     lwz 3,8(1);                                                         \
  60     mtlr 4;                                                             \
  61     mtcr 0;                                                             \
  62     addi 1,1,48;
  63
  64 # define DOCARGS_0
  65 # define UNDOCARGS_0
  66
  67 # define DOCARGS_1      stw 3,20(1); DOCARGS_0
  68 # define UNDOCARGS_1    lwz 3,20(1); UNDOCARGS_0
  69
  70 # define DOCARGS_2      stw 4,24(1); DOCARGS_1
  71 # define UNDOCARGS_2    lwz 4,24(1); UNDOCARGS_1
  72
  73 # define DOCARGS_3      stw 5,28(1); DOCARGS_2
  74 # define UNDOCARGS_3    lwz 5,28(1); UNDOCARGS_2
  75
  76 # define DOCARGS_4      stw 6,32(1); DOCARGS_3
  77 # define UNDOCARGS_4    lwz 6,32(1); UNDOCARGS_3
  78
  79 # define DOCARGS_5      stw 7,36(1); DOCARGS_4
  80 # define UNDOCARGS_5    lwz 7,36(1); UNDOCARGS_4
  81
  82 # define DOCARGS_6      stw 8,40(1); DOCARGS_5
  83 # define UNDOCARGS_6    lwz 8,40(1); UNDOCARGS_5
  84
  85 # ifdef IS_IN_libpthread
  86 #  define CENABLE       bl __pthread_enable_asynccancel@local
  87 #  define CDISABLE      bl __pthread_disable_asynccancel@local
  88 # elif !defined NOT_IN_libc
  89 #  define CENABLE       bl __libc_enable_asynccancel@local
  90 #  define CDISABLE      bl __libc_disable_asynccancel@local
  91 # elif defined IS_IN_librt
  92 #  define CENABLE       bl __librt_enable_asynccancel@local
  93 #  define CDISABLE      bl __librt_disable_asynccancel@local
  94 # else
  95 #  error Unsupported library
  96 # endif
  97
  98 # ifndef __ASSEMBLER__
  99 #  define SINGLE_THREAD_P                                               \
 100   __builtin_expect (THREAD_GETMEM (THREAD_SELF,                         \
 101                                    header.multiple_threads) == 0, 1)
 102 # else
 103 #  define SINGLE_THREAD_P                                               \
 104   lwz 10,MULTIPLE_THREADS_OFFSET(2);                                    \
 105   cmpwi 10,0
 106 # endif
 107
 108 #elif !defined __ASSEMBLER__
 109
 110 # define SINGLE_THREAD_P (1)
 111 # define NO_CANCELLATION 1
 112
 113 #endif
 114
 115 #ifndef __ASSEMBLER__
 116 # define RTLD_SINGLE_THREAD_P \
 117   __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
 118                                    header.multiple_threads) == 0, 1)
 119 #endif