nptl/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep-cancel.h

   1 /* Cancellable system call stubs.  Linux/PowerPC64 version.
   2    Copyright (C) 2003, 2004 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., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 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 # ifdef HAVE_ASM_GLOBAL_DOT_NAME
  30 #  define DASHDASHPFX(str) .__##str
  31 # else
  32 #  define DASHDASHPFX(str) __##str
  33 # endif
  34
  35 # undef PSEUDO
  36 # define PSEUDO(name, syscall_name, args)                               \
  37   .section ".text";                                                     \
  38   ENTRY (name)                                                          \
  39     cfi_startproc;                                                      \
  40     SINGLE_THREAD_P;                                                    \
  41     bne- .Lpseudo_cancel;                                               \
  42   .type DASHDASHPFX(syscall_name##_nocancel),@function;                 \
  43   .globl DASHDASHPFX(syscall_name##_nocancel);                          \
  44   DASHDASHPFX(syscall_name##_nocancel):                                 \
  45     DO_CALL (SYS_ify (syscall_name));                                   \
  46     PSEUDO_RET;                                                         \
  47   .size DASHDASHPFX(syscall_name##_nocancel),.-DASHDASHPFX(syscall_name##_nocancel);    \
  48   .Lpseudo_cancel:                                                      \
  49     stdu 1,-128(1);                                                     \
  50     cfi_adjust_cfa_offset (128);                                        \
  51     mflr 9;                                                             \
  52     std  9,128+16(1);                                                   \
  53     cfi_offset (lr, 16);                                                \
  54     DOCARGS_##args;     /* save syscall args around CENABLE.  */        \
  55     CENABLE;                                                            \
  56     std  3,72(1);       /* store CENABLE return value (MASK).  */       \
  57     UNDOCARGS_##args;   /* restore syscall args.  */                    \
  58     DO_CALL (SYS_ify (syscall_name));                                   \
  59     mfcr 0;             /* save CR/R3 around CDISABLE.  */              \
  60     std  3,64(1);                                                       \
  61     std  0,8(1);                                                        \
  62     ld   3,72(1);       /* pass MASK to CDISABLE.  */                   \
  63     CDISABLE;                                                           \
  64     ld   9,128+16(1);                                                   \
  65     ld   0,8(1);        /* restore CR/R3. */                            \
  66     ld   3,64(1);                                                       \
  67     mtlr 9;                                                             \
  68     mtcr 0;                                                             \
  69     addi 1,1,128;                                                       \
  70     cfi_endproc;
  71
  72 # define DOCARGS_0
  73 # define UNDOCARGS_0
  74
  75 # define DOCARGS_1      std 3,80(1); DOCARGS_0
  76 # define UNDOCARGS_1    ld 3,80(1); UNDOCARGS_0
  77
  78 # define DOCARGS_2      std 4,88(1); DOCARGS_1
  79 # define UNDOCARGS_2    ld 4,88(1); UNDOCARGS_1
  80
  81 # define DOCARGS_3      std 5,96(1); DOCARGS_2
  82 # define UNDOCARGS_3    ld 5,96(1); UNDOCARGS_2
  83
  84 # define DOCARGS_4      std 6,104(1); DOCARGS_3
  85 # define UNDOCARGS_4    ld 6,104(1); UNDOCARGS_3
  86
  87 # define DOCARGS_5      std 7,112(1); DOCARGS_4
  88 # define UNDOCARGS_5    ld 7,112(1); UNDOCARGS_4
  89
  90 # define DOCARGS_6      std 8,120(1); DOCARGS_5
  91 # define UNDOCARGS_6    ld 8,120(1); UNDOCARGS_5
  92
  93 # ifdef IS_IN_libpthread
  94 #  define CENABLE       bl JUMPTARGET(__pthread_enable_asynccancel)
  95 #  define CDISABLE      bl JUMPTARGET(__pthread_disable_asynccancel)
  96 # elif !defined NOT_IN_libc
  97 #  define CENABLE       bl JUMPTARGET(__libc_enable_asynccancel)
  98 #  define CDISABLE      bl JUMPTARGET(__libc_disable_asynccancel)
  99 # elif defined IS_IN_librt
 100 #  define CENABLE       bl JUMPTARGET(__librt_enable_asynccancel)
 101 #  define CDISABLE      bl JUMPTARGET(__librt_disable_asynccancel)
 102 # else
 103 #  error Unsupported library
 104 # endif
 105
 106 # ifndef __ASSEMBLER__
 107 #  define SINGLE_THREAD_P                                               \
 108   __builtin_expect (THREAD_GETMEM (THREAD_SELF,                         \
 109                                    header.multiple_threads) == 0, 1)
 110 # else
 111 #   define SINGLE_THREAD_P                                              \
 112   lwz   10,MULTIPLE_THREADS_OFFSET(13);                         \
 113   cmpwi 10,0
 114 # endif
 115
 116 #elif !defined __ASSEMBLER__
 117
 118 # define SINGLE_THREAD_P (1)
 119 # define NO_CANCELLATION 1
 120
 121 #endif