l4/pkg/l4re-core/uclibc/lib/contrib/uclibc/libpthread/nptl/sysdeps/unix/sysv/linux/metag/sysdep-cancel.h

   1 /* Copyright (C) 2003, 2004, 2005, 2009 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 <tls.h>
  20 #include <sysdep.h>
  21 #ifndef __ASSEMBLER__
  22 # include <pthreadP.h>
  23 #endif
  24
  25 #if !defined NOT_IN_libc || defined IS_IN_libpthread || defined IS_IN_librt
  26
  27 /* NOTE: We do mark syscalls with unwind annotations, for the benefit of
  28    cancellation; but they're really only accurate at the point of the
  29    syscall.  The ARM unwind directives are not rich enough without adding
  30    a custom personality function.  */
  31
  32 #ifdef __ASSEMBLER__
  33 #undef ret
  34 #define ret                                                             \
  35    CMP D0Re0, #-4095;                                                   \
  36    MOVLO PC, D1RtP;                                                     \
  37    MOV D1Ar1, D0Re0;                                                    \
  38    B SYSCALL_ERROR;
  39 #endif /* __ASSEMBLER__ */
  40
  41 # undef PSEUDO
  42 # define PSEUDO(name, syscall_name, args)                               \
  43   .section ".text";                                                     \
  44   .type ___##syscall_name##_nocancel,%function;                         \
  45   .globl ___##syscall_name##_nocancel;                                  \
  46   ___##syscall_name##_nocancel:                                         \
  47     cfi_startproc;                                                      \
  48     DO_CALL (syscall_name, args);                                       \
  49     MOV PC, D1RtP;                                                      \
  50     cfi_endproc;                                                        \
  51   .size ___##syscall_name##_nocancel,.-___##syscall_name##_nocancel;    \
  52     .globl _##name;                                                     \
  53     .type _##name, @function;                                           \
  54 name##:                                                                 \
  55 _##name##:                                                              \
  56     DOCARGS_##args;                                                     \
  57     SINGLE_THREAD_P;                                                    \
  58     UNDOCARGS_##args;                                                   \
  59     BNE .Lpseudo_cancel;                                                \
  60     cfi_remember_state;                                                 \
  61     DO_CALL (syscall_name, 0);                                          \
  62     ret                                                                 \
  63     cfi_restore_state;                                                  \
  64   .Lpseudo_cancel:                                                      \
  65     MSETL [A0StP++], D0FrT, D0.5;                                       \
  66     DOCARGS_##args;     /* save syscall args etc. around CENABLE.  */   \
  67     CENABLE;                                                            \
  68     MOV D0FrT, D0Re0;   /* put mask in safe place.  */                  \
  69     UNDOCARGS_##args;   /* restore syscall args.  */                    \
  70     DO_CALL(syscall_name, 0);   /* do the call.  */                     \
  71     MOV D0.5, D0Re0;    /* save syscall return value.  */               \
  72     MOV D1Ar1, D0FrT;   /* get mask back.  */                           \
  73     CDISABLE;                                                           \
  74     MOV D0Re0, D0.5;    /* retrieve return value.  */                   \
  75     GETL D0.5, D1.5, [--A0StP];                                         \
  76     GETL D0FrT, D1RtP, [--A0StP];
  77
  78 # define DOCARGS_0
  79 # define UNDOCARGS_0
  80
  81 # define DOCARGS_1 \
  82   SETL [A0StP++], D1Ar1, D0Ar2
  83 # define UNDOCARGS_1 \
  84   GETL D1Ar1, D0Ar2, [--A0StP]
  85
  86 # define DOCARGS_2 DOCARGS_1
  87
  88 # define UNDOCARGS_2 UNDOCARGS_2
  89
  90 # define DOCARGS_3 \
  91   MSETL [A0StP++], D1Ar1, D1Ar3
  92
  93 # define UNDOCARGS_3 \
  94   GETL D1Ar1, D0Ar2, [--A0StP];         \
  95   GETL D1Ar3, D0Ar4, [--A0StP]
  96
  97 # define DOCARGS_4 DOCARGS_3
  98 # define UNDOCARGS_4 UNDOCARGS_3
  99
 100 # define DOCARGS_5 \
 101   MSETL [A0StP++], D1Ar1, D1Ar3, D1Ar5
 102 # define UNDOCARGS_5 \
 103   GETL D1Ar1, D0Ar2, [--A0StP];         \
 104   GETL D1Ar3, D0Ar4, [--A0StP];         \
 105   GETL D1Ar5, D0Ar6, [--A0StP]
 106
 107 # define DOCARGS_6 DOCARGS_5
 108 # define UNDOCARGS_6 UNDOCARGS_5
 109
 110 # ifdef IS_IN_libpthread
 111 #  define CENABLE       CALLR D1RtP, ___pthread_enable_asynccancel@PLT
 112 #  define CDISABLE      CALLR D1RtP, ___pthread_disable_asynccancel@PLT
 113 #  define __local_multiple_threads __pthread_multiple_threads
 114 # elif !defined NOT_IN_libc
 115 #  define CENABLE       CALLR D1RtP, ___libc_enable_asynccancel@PLT
 116 #  define CDISABLE      CALLR D1RtP, ___libc_disable_asynccancel@PLT
 117 #  define __local_multiple_threads __libc_multiple_threads
 118 # elif defined IS_IN_librt
 119 #  define CENABLE       CALLR D1RtP, ___librt_enable_asynccancel@PLT
 120 #  define CDISABLE      CALLR D1RtP, ___librt_disable_asynccancel@PLT
 121 # else
 122 #  error Unsupported library
 123 # endif
 124
 125 #ifndef __ASSEMBLER__
 126 #   define SINGLE_THREAD_P                                              \
 127     likely(THREAD_GETMEM (THREAD_SELF,                  \
 128                                    header.multiple_threads) == 0)
 129 #else
 130 #  define SINGLE_THREAD_P \
 131         SETL    [A0StP++], D0FrT, D1RtP; \
 132         CALLR   D1RtP, ___metag_load_tp@PLT; \
 133         SUB     D0Re0, D0Re0, #TLS_PRE_TCB_SIZE;        \
 134         GETD    D0Re0, [D0Re0 + #MULTIPLE_THREADS_OFFSET]; \
 135         CMP     D0Re0, #0; \
 136         GETL    D0FrT, D1RtP, [--A0StP]
 137 #endif
 138
 139
 140 #elif !defined __ASSEMBLER__
 141
 142 /* For rtld, et cetera.  */
 143 # define SINGLE_THREAD_P 1
 144 # define NO_CANCELLATION 1
 145
 146 #endif
 147
 148 #ifndef __ASSEMBLER__
 149 # define RTLD_SINGLE_THREAD_P \
 150     likely(THREAD_GETMEM (THREAD_SELF,  \
 151                                    header.multiple_threads) == 0)
 152 #endif