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Diffstat (limited to 'libgcc/config/nds32/initfini.c')
| -rw-r--r-- | libgcc/config/nds32/initfini.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/libgcc/config/nds32/initfini.c b/libgcc/config/nds32/initfini.c new file mode 100644 index 00000000000..7235148c5e3 --- /dev/null +++ b/libgcc/config/nds32/initfini.c @@ -0,0 +1,159 @@ +/* .init/.fini section handling + C++ global constructor/destructor + handling of Andes NDS32 cpu for GNU compiler. + This file is based on crtstuff.c, sol2-crti.asm, sol2-crtn.asm. + Copyright (C) 2012-2013 Free Software Foundation, Inc. + Contributed by Andes Technology Corporation. + + This file is part of GCC. + + GCC is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published + by the Free Software Foundation; either version 3, or (at your + option) any later version. + + GCC is distributed in the hope that it will be useful, but WITHOUT + ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public + License for more details. + + Under Section 7 of GPL version 3, you are granted additional + permissions described in the GCC Runtime Library Exception, version + 3.1, as published by the Free Software Foundation. + + You should have received a copy of the GNU General Public License and + a copy of the GCC Runtime Library Exception along with this program; + see the files COPYING3 and COPYING.RUNTIME respectively. If not, see + <http://www.gnu.org/licenses/>. */ + +/* Declare a pointer to void function type. */ +typedef void (*func_ptr) (void); + +#ifdef CRT_BEGIN + +/* NOTE: In order to be able to support SVR4 shared libraries, we arrange + to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__, + __DTOR_END__ } per root executable and also one set of these symbols + per shared library. So in any given whole process image, we may have + multiple definitions of each of these symbols. In order to prevent + these definitions from conflicting with one another, and in order to + ensure that the proper lists are used for the initialization/finalization + of each individual shared library (respectively), we give these symbols + only internal (i.e. `static') linkage, and we also make it a point to + refer to only the __CTOR_END__ symbol in crtfini.o and the __DTOR_LIST__ + symbol in crtinit.o, where they are defined. */ + +static func_ptr __CTOR_LIST__[1] __attribute__ ((section (".ctors"))) + = { (func_ptr) (-1) }; + +static func_ptr __DTOR_LIST__[1] __attribute__ ((section (".dtors"))) + = { (func_ptr) (-1) }; + +/* Run all the global destructors on exit from the program. */ + +/* Some systems place the number of pointers in the first word of the + table. On SVR4 however, that word is -1. In all cases, the table is + null-terminated. On SVR4, we start from the beginning of the list and + invoke each per-compilation-unit destructor routine in order + until we find that null. + + Note that this function MUST be static. There will be one of these + functions in each root executable and one in each shared library, but + although they all have the same code, each one is unique in that it + refers to one particular associated `__DTOR_LIST__' which belongs to the + same particular root executable or shared library file. */ + +static void __do_global_dtors (void) +asm ("__do_global_dtors") __attribute__ ((section (".text"))); + +static void +__do_global_dtors (void) +{ + func_ptr *p; + for (p = __DTOR_LIST__ + 1; *p; p++) + (*p) (); +} + +/* .init section start. + This must appear at the start of the .init section. */ + +asm ("\n\ + .section .init\n\ + .global _init\n\ + .type _init, @function\n\ +_init:\n\ + ! 1. store $fp\n\ + ! 2. adjust $fp by $sp\n\ + ! 3. adjust $sp\n\ +"); + +/* .fini section start. + This must appear at the start of the .fini section. */ + +asm ("\n\ + .section .fini\n\ + .global _fini\n\ + .type _fini, @function\n\ +_fini:\n\ + ! 1. store $fp\n\ + ! 2. adjust $fp by $sp\n\ + ! 3. adjust $sp\n\ + ! 4. call __do_global_dtors\n\ + j __do_global_dtors\n\ +"); + +#endif /* CRT_BEGIN */ + +#ifdef CRT_END + +/* Define __dso_handle which would be needed for C++ library. + Since our elf-toolchain only builds programs with static link, + we can directly define 'void *__dso_handle = 0'. */ +void *__dso_handle = 0; + +/* Put a word containing zero at the end of each of our two lists of function + addresses. Note that the words defined here go into the .ctors and .dtors + sections of the crtend.o file, and since that file is always linked in + last, these words naturally end up at the very ends of the two lists + contained in these two sections. */ + +static func_ptr __CTOR_END__[1] __attribute__ ((section (".ctors"))) + = { (func_ptr) 0 }; + +static func_ptr __DTOR_END__[1] __attribute__ ((section (".dtors"))) + = { (func_ptr) 0 }; + +/* Run all global constructors for the program. + Note that they are run in reverse order. */ + +static void __do_global_ctors (void) +asm ("__do_global_ctors") __attribute__ ((section (".text"))); + +static void +__do_global_ctors (void) +{ + func_ptr *p; + for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) + (*p) (); +} + +/* .init section end. + This must live at the end of the .init section. */ + +asm ("\n\ + .section .init\n\ + ! 1. call __do_global_ctors\n\ + ! 2. adjust back $sp\n\ + ! 3. restore $fp\n\ + j __do_global_ctors\n\ +"); + +/* .fini section end. + This must live at the end of the .fini section. */ + +asm ("\n\ + .section .fini\n\ + ! 1. adjust back $sp\n\ + ! 2. restore $fp\n\ +"); + +#endif /* CRT_END */ |