libpthread/nptl/sysdeps/unix/sysv/linux/arm/sysdep-cancel.h

   1 /* Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <sysdep.h>
  20 #ifndef __ASSEMBLER__
  21 # include <pthreadP.h>
  22 #endif
  23
  24 #if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
  25
  26 # undef PSEUDO
  27 # define PSEUDO(name, syscall_name, args)                               \
  28   .section ".text";                                                     \
  29     PSEUDO_PROLOGUE;                                                    \
  30   .type __##syscall_name##_nocancel,%function;                          \
  31   .globl __##syscall_name##_nocancel;                                   \
  32   __##syscall_name##_nocancel:                                          \
  33     DO_CALL (syscall_name, args);                                       \
  34     PSEUDO_RET;                                                         \
  35   .size __##syscall_name##_nocancel,.-__##syscall_name##_nocancel;      \
  36   ENTRY (name);                                                         \
  37     SINGLE_THREAD_P;                                                    \
  38     DOARGS_##args;                                                      \
  39     bne .Lpseudo_cancel;                                                \
  40     DO_CALL (syscall_name, 0);                                          \
  41     UNDOARGS_##args;                                                    \
  42     cmn r0, $4096;                                                      \
  43     PSEUDO_RET;                                                         \
  44   .Lpseudo_cancel:                                                      \
  45     DOCARGS_##args;     /* save syscall args etc. around CENABLE.  */   \
  46     CENABLE;                                                            \
  47     mov ip, r0;         /* put mask in safe place.  */                  \
  48     UNDOCARGS_##args;   /* restore syscall args.  */                    \
  49     swi SYS_ify (syscall_name); /* do the call.  */                     \
  50     str r0, [sp, $-4]!; /* save syscall return value.  */               \
  51     mov r0, ip;         /* get mask back.  */                           \
  52     CDISABLE;                                                           \
  53     ldmfd sp!, {r0, lr}; /* retrieve return value and address.  */      \
  54     UNDOARGS_##args;                                                    \
  55     cmn r0, $4096;
  56
  57 # define DOCARGS_0      str lr, [sp, #-4]!;
  58 # define UNDOCARGS_0
  59
  60 # define DOCARGS_1      stmfd sp!, {r0, lr};
  61 # define UNDOCARGS_1    ldr r0, [sp], #4;
  62
  63 # define DOCARGS_2      stmfd sp!, {r0, r1, lr};
  64 # define UNDOCARGS_2    ldmfd sp!, {r0, r1};
  65
  66 # define DOCARGS_3      stmfd sp!, {r0, r1, r2, lr};
  67 # define UNDOCARGS_3    ldmfd sp!, {r0, r1, r2};
  68
  69 # define DOCARGS_4      stmfd sp!, {r0, r1, r2, r3, lr};
  70 # define UNDOCARGS_4    ldmfd sp!, {r0, r1, r2, r3};
  71
  72 # define DOCARGS_5      DOCARGS_4
  73 # define UNDOCARGS_5    UNDOCARGS_4
  74
  75 # define DOCARGS_6      DOCARGS_5
  76 # define UNDOCARGS_6    UNDOCARGS_5
  77
  78 # ifdef IS_IN_libpthread
  79 #  define CENABLE       bl PLTJMP(__pthread_enable_asynccancel)
  80 #  define CDISABLE      bl PLTJMP(__pthread_disable_asynccancel)
  81 #  define __local_multiple_threads __pthread_multiple_threads
  82 # elif !defined NOT_IN_libc
  83 #  define CENABLE       bl PLTJMP(__libc_enable_asynccancel)
  84 #  define CDISABLE      bl PLTJMP(__libc_disable_asynccancel)
  85 #  define __local_multiple_threads __libc_multiple_threads
  86 # elif defined IS_IN_librt
  87 #  define CENABLE       bl PLTJMP(__librt_enable_asynccancel)
  88 #  define CDISABLE      bl PLTJMP(__librt_disable_asynccancel)
  89 # else
  90 #  error Unsupported library
  91 # endif
  92
  93 # if defined IS_IN_libpthread || !defined NOT_IN_libc
  94 #  ifndef __ASSEMBLER__
  95 extern int __local_multiple_threads attribute_hidden;
  96 #   define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
  97 #  else
  98 #   define SINGLE_THREAD_P                                              \
  99   ldr ip, 1b;                                                           \
 100 2:                                                                      \
 101   ldr ip, [pc, ip];                                                     \
 102   teq ip, #0;
 103 #   define PSEUDO_PROLOGUE                                              \
 104   1:  .word __local_multiple_threads - 2f - 8;
 105 #  endif
 106 # else
 107 /*  There is no __local_multiple_threads for librt, so use the TCB.  */
 108 #  ifndef __ASSEMBLER__
 109 #   define SINGLE_THREAD_P                                              \
 110   __builtin_expect (THREAD_GETMEM (THREAD_SELF,                         \
 111                                    header.multiple_threads) == 0, 1)
 112 #  else
 113 #   define PSEUDO_PROLOGUE
 114 #   define SINGLE_THREAD_P                                              \
 115   stmfd sp!, {r0, lr};                                                  \
 116   bl    __aeabi_read_tp;                                                \
 117   ldr   ip, [r0, #MULTIPLE_THREADS_OFFSET];                             \
 118   ldmfd sp!, {r0, lr};                                                  \
 119   teq   ip, #0
 120 #   define SINGLE_THREAD_P_PIC(x) SINGLE_THREAD_P
 121 #  endif
 122 # endif
 123
 124 #elif !defined __ASSEMBLER__
 125
 126 /* For rtld, et cetera.  */
 127 # define SINGLE_THREAD_P 1
 128 # define NO_CANCELLATION 1
 129
 130 #endif
 131
 132 #ifndef __ASSEMBLER__
 133 # define RTLD_SINGLE_THREAD_P \
 134   __builtin_expect (THREAD_GETMEM (THREAD_SELF, \
 135                                    header.multiple_threads) == 0, 1)
 136 #endif