sysdeps/unix/sysv/linux/microblaze/sysdep-cancel.h

   1 /* Copyright (C) 2014-2015 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <sysdep.h>
  19 #include <tls.h>
  20 #ifndef __ASSEMBLER__
  21 # include <nptl/pthreadP.h>
  22 #endif
  23
  24 #if IS_IN (libc) || IS_IN (libpthread) || IS_IN (librt)
  25
  26 # if !IS_IN (librt) || !defined(PIC)
  27 #  define AC_STACK_SIZE  16  /* space for r15, async_cancel arg and 2 temp words */
  28 #  define AC_SET_GOT /* empty */
  29 #  define AC_RESTORE_GOT /* empty */
  30 # else
  31 #  define AC_STACK_SIZE  20  /* extra 4 bytes for r20 */
  32 #  define AC_SET_GOT                                                 \
  33     swi   r20, r1, AC_STACK_SIZE-4;                                  \
  34     mfs   r20, rpc;                                                  \
  35     addik r20, r20, _GLOBAL_OFFSET_TABLE_+8;
  36 #  define AC_RESTORE_GOT                                             \
  37     lwi   r20, r1, AC_STACK_SIZE-4;
  38 # endif
  39
  40 # undef PSEUDO
  41 # define PSEUDO(name, syscall_name, args)                            \
  42   .text;                                                             \
  43   ENTRY (name)                                                       \
  44     SINGLE_THREAD_P(r12);                                            \
  45     bnei r12, L(pseudo_cancel);                                      \
  46   .globl __##syscall_name##_nocancel;                                \
  47   .type __##syscall_name##_nocancel,@function;                       \
  48 __##syscall_name##_nocancel:                                         \
  49     DO_CALL (syscall_name, args);                                    \
  50     addik r4, r0, -4095;                                             \
  51     cmpu  r4, r4, r3;                                                \
  52     bgei  r4, SYSCALL_ERROR_LABEL;                                   \
  53     rtsd  r15, 8;                                                    \
  54     nop;                                                             \
  55   .size __##syscall_name##_nocancel, .-__##syscall_name##_nocancel;  \
  56 L(pseudo_cancel):                                                    \
  57     addik r1, r1, -AC_STACK_SIZE;                                    \
  58     swi   r15, r1, 0;                                                \
  59     AC_SET_GOT                                                       \
  60     DOCARGS_##args                                                   \
  61     CENABLE;                                                         \
  62     swi   r3, r1, 8;                                                 \
  63     UNDOCARGS_##args                                                 \
  64     DO_CALL (syscall_name, args);                                    \
  65     swi   r3, r1, 12;                                                \
  66     lwi   r5, r1, 8;                                                 \
  67     CDISABLE;                                                        \
  68     lwi   r3, r1, 12;                                                \
  69     lwi   r15, r1, 0;                                                \
  70     AC_RESTORE_GOT                                                   \
  71     addik r1, r1, AC_STACK_SIZE;                                     \
  72     addik r4, r0, -4095;                                             \
  73     cmpu  r4, r4, r3;                                                \
  74     bgei  r4, SYSCALL_ERROR_LABEL;                                   \
  75     rtsd  r15, 8;                                                    \
  76     nop;
  77
  78 /*
  79  * Macros to save/restore syscall arguments across CENABLE
  80  * The arguments are saved into the caller's stack (original r1 + 4)
  81  */
  82
  83 # define DOCARGS_0
  84 # define DOCARGS_1  swi   r5, r1, AC_STACK_SIZE + 4;
  85 # define DOCARGS_2  swi   r6, r1, AC_STACK_SIZE + 8; DOCARGS_1
  86 # define DOCARGS_3  swi   r7, r1, AC_STACK_SIZE + 12; DOCARGS_2
  87 # define DOCARGS_4  swi   r8, r1, AC_STACK_SIZE + 16; DOCARGS_3
  88 # define DOCARGS_5  swi   r9, r1, AC_STACK_SIZE + 20; DOCARGS_4
  89 # define DOCARGS_6  swi   r10, r1, AC_STACK_SIZE + 24; DOCARGS_5
  90
  91 # define UNDOCARGS_0
  92 # define UNDOCARGS_1  lwi   r5, r1, AC_STACK_SIZE + 4;
  93 # define UNDOCARGS_2  UNDOCARGS_1 lwi   r6, r1, AC_STACK_SIZE + 8;
  94 # define UNDOCARGS_3  UNDOCARGS_2 lwi   r7, r1, AC_STACK_SIZE + 12;
  95 # define UNDOCARGS_4  UNDOCARGS_3 lwi   r8, r1, AC_STACK_SIZE + 16;
  96 # define UNDOCARGS_5  UNDOCARGS_4 lwi   r9, r1, AC_STACK_SIZE + 20;
  97 # define UNDOCARGS_6  UNDOCARGS_5 lwi   r10, r1, AC_STACK_SIZE + 24;
  98
  99 # ifdef PIC
 100 #  define PSEUDO_JMP(sym)  brlid r15, sym##@PLTPC; addk r0, r0, r0
 101 # else
 102 #  define PSEUDO_JMP(sym)  brlid r15, sym; addk r0, r0, r0
 103 # endif
 104
 105 # if IS_IN (libpthread)
 106 #  define CENABLE PSEUDO_JMP (__pthread_enable_asynccancel)
 107 #  define CDISABLE  PSEUDO_JMP (__pthread_disable_asynccancel)
 108 #  define __local_multiple_threads __pthread_multiple_threads
 109 # elif IS_IN (libc)
 110 #  define CENABLE PSEUDO_JMP (__libc_enable_asynccancel)
 111 #  define CDISABLE  PSEUDO_JMP (__libc_disable_asynccancel)
 112 #  define __local_multiple_threads __libc_multiple_threads
 113 # elif IS_IN (librt)
 114 #  define CENABLE PSEUDO_JMP (__librt_enable_asynccancel)
 115 #  define CDISABLE  PSEUDO_JMP (__librt_disable_asynccancel)
 116 # else
 117 #  error Unsupported library
 118 # endif
 119
 120
 121 # if IS_IN (libpthread) || IS_IN (libc)
 122 #  ifndef __ASSEMBLER__
 123 extern int __local_multiple_threads attribute_hidden;
 124 #   define SINGLE_THREAD_P __builtin_expect (__local_multiple_threads == 0, 1)
 125 #  else
 126 #   if !defined PIC
 127 #    define SINGLE_THREAD_P(reg) lwi reg, r0, __local_multiple_threads;
 128 #   else
 129 #    define SINGLE_THREAD_P(reg)                                     \
 130       mfs   reg, rpc;                                                \
 131       addik reg, reg, _GLOBAL_OFFSET_TABLE_+8;                       \
 132       lwi   reg, reg, __local_multiple_threads@GOT;                  \
 133       lwi   reg, reg, 0;
 134 #   endif
 135 #  endif
 136 # else
 137 #  ifndef __ASSEMBLER__
 138 #   define SINGLE_THREAD_P                                           \
 139   __builtin_expect (THREAD_GETMEM (THREAD_SELF,                      \
 140                                    header.multiple_threads) == 0, 1)
 141 #  else
 142 #   define SINGLE_THREAD_P(reg)                                      \
 143      lwi reg, r0, MULTIPLE_THREADS_OFFSET(reg)
 144 #  endif
 145 # endif
 146
 147 #elif !defined __ASSEMBLER__
 148
 149 # define SINGLE_THREAD_P (1)
 150 # define NO_CANCELLATION (1)
 151
 152 #endif
 153
 154 #ifndef __ASSEMBLER__
 155 # define RTLD_SINGLE_THREAD_P                                        \
 156   __builtin_expect (THREAD_GETMEM (THREAD_SELF,                      \
 157                                    header.multiple_threads) == 0, 1)
 158 #endif