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- /* .init/.fini section handling + C++ global constructor/destructor handling.
- This file is based on crtstuff.c, sol2-crti.S, sol2-crtn.S.
- Copyright (C) 1996-2022 Free Software Foundation, Inc.
- 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_INIT
- /* 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__ ((used, section (".ctors")))
- = { (func_ptr) (-1) };
- static func_ptr __DTOR_LIST__[1]
- __attribute__ ((used, 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__ ((used, 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,\"ax\",@progbits\n\
- .balign 4\n\
- .global __init\n\
- __init:\n\
- push fp\n\
- push lr\n\
- mv fp,sp\n\
- seth r0, #shigh(__fini)\n\
- add3 r0, r0, #low(__fini)\n\
- bl atexit\n\
- .fillinsn\n\
- ");
- /* .fini section start.
- This must appear at the start of the .init section. */
- asm ("\n\
- .section .fini,\"ax\",@progbits\n\
- .balign 4\n\
- .global __fini\n\
- __fini:\n\
- push fp\n\
- push lr\n\
- mv fp,sp\n\
- bl __do_global_dtors\n\
- .fillinsn\n\
- ");
- #endif /* CRT_INIT */
- #ifdef CRT_FINI
- /* 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__ ((used, section (".ctors")))
- = { (func_ptr) 0 };
- static func_ptr __DTOR_END__[1]
- __attribute__ ((used, 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__ ((used, 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,\"ax\",@progbits\n\
- bl __do_global_ctors\n\
- mv sp,fp\n\
- pop lr\n\
- pop fp\n\
- jmp lr\n\
- .fillinsn\n\
- ");
- /* .fini section end.
- This must live at the end of the .fini section. */
- asm ("\n\
- .section .fini,\"ax\",@progbits\n\
- mv sp,fp\n\
- pop lr\n\
- pop fp\n\
- jmp lr\n\
- .fillinsn\n\
- ");
- #endif /* CRT_FINI */
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