| /* Specialized bits of code needed to support construction and |
| destruction of file-scope objects in C++ code. |
| Copyright (C) 1991-2020 Free Software Foundation, Inc. |
| Contributed by Ron Guilmette (rfg@monkeys.com). |
| |
| 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/>. */ |
| |
| /* This file is a bit like libgcc2.c in that it is compiled |
| multiple times and yields multiple .o files. |
| |
| This file is useful on target machines where the object file format |
| supports multiple "user-defined" sections (e.g. COFF, ELF, ROSE). On |
| such systems, this file allows us to avoid running collect (or any |
| other such slow and painful kludge). Additionally, if the target |
| system supports a .init section, this file allows us to support the |
| linking of C++ code with a non-C++ main program. |
| |
| Note that if INIT_SECTION_ASM_OP is defined in the tm.h file, then |
| this file *will* make use of the .init section. If that symbol is |
| not defined however, then the .init section will not be used. |
| |
| Currently, only ELF and COFF are supported. It is likely however that |
| ROSE could also be supported, if someone was willing to do the work to |
| make whatever (small?) adaptations are needed. (Some work may be |
| needed on the ROSE assembler and linker also.) |
| |
| This file must be compiled with gcc. */ |
| |
| /* Target machine header files require this define. */ |
| #define IN_LIBGCC2 |
| |
| /* FIXME: Including auto-host is incorrect, but until we have |
| identified the set of defines that need to go into auto-target.h, |
| this will have to do. */ |
| #include "auto-host.h" |
| #undef caddr_t |
| #undef pid_t |
| #undef rlim_t |
| #undef ssize_t |
| #undef vfork |
| #include "tconfig.h" |
| #include "tsystem.h" |
| #include "coretypes.h" |
| #include "tm.h" |
| #include "libgcc_tm.h" |
| #include "unwind-dw2-fde.h" |
| |
| #ifndef FORCE_CODE_SECTION_ALIGN |
| # define FORCE_CODE_SECTION_ALIGN |
| #endif |
| |
| #ifndef CRT_CALL_STATIC_FUNCTION |
| # define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \ |
| static void __attribute__((__used__)) \ |
| call_ ## FUNC (void) \ |
| { \ |
| asm (SECTION_OP); \ |
| FUNC (); \ |
| FORCE_CODE_SECTION_ALIGN \ |
| asm (__LIBGCC_TEXT_SECTION_ASM_OP__); \ |
| } |
| #endif |
| |
| #if defined(TARGET_DL_ITERATE_PHDR) && \ |
| (defined(__DragonFly__) || defined(__FreeBSD__) || defined(__NetBSD__)) |
| #define BSD_DL_ITERATE_PHDR_AVAILABLE |
| #endif |
| |
| #if defined(OBJECT_FORMAT_ELF) \ |
| && !defined(OBJECT_FORMAT_FLAT) \ |
| && defined(HAVE_LD_EH_FRAME_HDR) \ |
| && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ |
| && defined(BSD_DL_ITERATE_PHDR_AVAILABLE) |
| #include <link.h> |
| # define USE_PT_GNU_EH_FRAME |
| #endif |
| |
| #if defined(OBJECT_FORMAT_ELF) \ |
| && !defined(OBJECT_FORMAT_FLAT) \ |
| && defined(HAVE_LD_EH_FRAME_HDR) && defined(TARGET_DL_ITERATE_PHDR) \ |
| && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ |
| && defined(__sun__) && defined(__svr4__) |
| #include <link.h> |
| # define USE_PT_GNU_EH_FRAME |
| #endif |
| |
| #if defined(OBJECT_FORMAT_ELF) \ |
| && !defined(OBJECT_FORMAT_FLAT) \ |
| && defined(HAVE_LD_EH_FRAME_HDR) \ |
| && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ |
| && defined(__GLIBC__) && __GLIBC__ >= 2 |
| #include <link.h> |
| /* uClibc pretends to be glibc 2.2 and DT_CONFIG is defined in its link.h. |
| But it doesn't use PT_GNU_EH_FRAME ELF segment currently. */ |
| # if !defined(__UCLIBC__) \ |
| && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \ |
| || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG))) |
| # define USE_PT_GNU_EH_FRAME |
| # endif |
| #endif |
| |
| #if defined(OBJECT_FORMAT_ELF) \ |
| && !defined(OBJECT_FORMAT_FLAT) \ |
| && defined(HAVE_LD_EH_FRAME_HDR) \ |
| && !defined(CRTSTUFFT_O) \ |
| && defined(inhibit_libc) \ |
| && (defined(__GLIBC__) || defined(__gnu_linux__) || defined(__GNU__)) |
| /* On systems using glibc, an inhibit_libc build of libgcc is only |
| part of a bootstrap process. Build the same crt*.o as would be |
| built with headers present, so that it is not necessary to build |
| glibc more than once for the bootstrap to converge. */ |
| # define USE_PT_GNU_EH_FRAME |
| #endif |
| |
| #ifdef USE_EH_FRAME_REGISTRY_ALWAYS |
| # ifndef __LIBGCC_EH_FRAME_SECTION_NAME__ |
| # error "Can't use explicit exception-frame-registration without __LIBGCC_EH_FRAME_SECTION_NAME__" |
| # endif |
| #endif |
| #if defined(__LIBGCC_EH_FRAME_SECTION_NAME__) && (!defined(USE_PT_GNU_EH_FRAME) || defined(USE_EH_FRAME_REGISTRY_ALWAYS)) |
| # define USE_EH_FRAME_REGISTRY |
| #endif |
| #if defined(__LIBGCC_EH_FRAME_SECTION_NAME__) \ |
| && __LIBGCC_EH_TABLES_CAN_BE_READ_ONLY__ |
| # define EH_FRAME_SECTION_CONST const |
| #else |
| # define EH_FRAME_SECTION_CONST |
| #endif |
| |
| #if !defined(DTOR_LIST_END) && defined(OBJECT_FORMAT_ELF) \ |
| && defined(HAVE_GAS_HIDDEN) && !defined(FINI_ARRAY_SECTION_ASM_OP) |
| # define HIDDEN_DTOR_LIST_END |
| #endif |
| |
| #if !defined(USE_TM_CLONE_REGISTRY) && defined(OBJECT_FORMAT_ELF) |
| # define USE_TM_CLONE_REGISTRY 1 |
| #elif !defined(USE_TM_CLONE_REGISTRY) |
| # define USE_TM_CLONE_REGISTRY 0 |
| #endif |
| |
| /* We do not want to add the weak attribute to the declarations of these |
| routines in unwind-dw2-fde.h because that will cause the definition of |
| these symbols to be weak as well. |
| |
| This exposes a core issue, how to handle creating weak references vs |
| how to create weak definitions. Either we have to have the definition |
| of TARGET_WEAK_ATTRIBUTE be conditional in the shared header files or |
| have a second declaration if we want a function's references to be weak, |
| but not its definition. |
| |
| Making TARGET_WEAK_ATTRIBUTE conditional seems like a good solution until |
| one thinks about scaling to larger problems -- i.e., the condition under |
| which TARGET_WEAK_ATTRIBUTE is active will eventually get far too |
| complicated. |
| |
| So, we take an approach similar to #pragma weak -- we have a second |
| declaration for functions that we want to have weak references. |
| |
| Neither way is particularly good. */ |
| |
| /* References to __register_frame_info and __deregister_frame_info should |
| be weak in this file if at all possible. */ |
| extern void __register_frame_info (const void *, struct object *) |
| TARGET_ATTRIBUTE_WEAK; |
| extern void __register_frame_info_bases (const void *, struct object *, |
| void *, void *) |
| TARGET_ATTRIBUTE_WEAK; |
| extern void *__deregister_frame_info (const void *) |
| TARGET_ATTRIBUTE_WEAK; |
| extern void *__deregister_frame_info_bases (const void *) |
| TARGET_ATTRIBUTE_WEAK; |
| extern void __do_global_ctors_1 (void); |
| |
| /* Likewise for transactional memory clone tables. */ |
| extern void _ITM_registerTMCloneTable (void *, size_t) TARGET_ATTRIBUTE_WEAK; |
| extern void _ITM_deregisterTMCloneTable (void *) TARGET_ATTRIBUTE_WEAK; |
| |
| #ifdef OBJECT_FORMAT_ELF |
| |
| /* Declare a pointer to void function type. */ |
| typedef void (*func_ptr) (void); |
| #define STATIC static |
| |
| #else /* OBJECT_FORMAT_ELF */ |
| |
| #include "gbl-ctors.h" |
| |
| #define STATIC |
| |
| #endif /* OBJECT_FORMAT_ELF */ |
| |
| #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 crtend.o and the __DTOR_LIST__ |
| symbol in crtbegin.o, where they are defined. */ |
| |
| /* No need for .ctors/.dtors section if linker can place them in |
| .init_array/.fini_array section. */ |
| #ifndef USE_INITFINI_ARRAY |
| /* The -1 is a flag to __do_global_[cd]tors indicating that this table |
| does not start with a count of elements. */ |
| #ifdef CTOR_LIST_BEGIN |
| CTOR_LIST_BEGIN; |
| #elif defined(__LIBGCC_CTORS_SECTION_ASM_OP__) |
| /* Hack: force cc1 to switch to .data section early, so that assembling |
| __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ |
| static func_ptr force_to_data[1] __attribute__ ((__used__)) = { }; |
| asm (__LIBGCC_CTORS_SECTION_ASM_OP__); |
| STATIC func_ptr __CTOR_LIST__[1] |
| __attribute__ ((__used__, aligned(__alignof__(func_ptr)))) |
| = { (func_ptr) (-1) }; |
| #else |
| STATIC func_ptr __CTOR_LIST__[1] |
| __attribute__ ((__used__, section(".ctors"), aligned(__alignof__(func_ptr)))) |
| = { (func_ptr) (-1) }; |
| #endif /* __CTOR_LIST__ alternatives */ |
| |
| #ifdef DTOR_LIST_BEGIN |
| DTOR_LIST_BEGIN; |
| #elif defined(__LIBGCC_DTORS_SECTION_ASM_OP__) |
| asm (__LIBGCC_DTORS_SECTION_ASM_OP__); |
| STATIC func_ptr __DTOR_LIST__[1] |
| __attribute__ ((aligned(__alignof__(func_ptr)))) |
| = { (func_ptr) (-1) }; |
| #else |
| STATIC func_ptr __DTOR_LIST__[1] |
| __attribute__((section(".dtors"), aligned(__alignof__(func_ptr)))) |
| = { (func_ptr) (-1) }; |
| #endif /* __DTOR_LIST__ alternatives */ |
| #endif /* USE_INITFINI_ARRAY */ |
| |
| #ifdef USE_EH_FRAME_REGISTRY |
| /* Stick a label at the beginning of the frame unwind info so we can register |
| and deregister it with the exception handling library code. */ |
| STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[] |
| __attribute__((section(__LIBGCC_EH_FRAME_SECTION_NAME__), aligned(4))) |
| = { }; |
| #endif /* USE_EH_FRAME_REGISTRY */ |
| |
| #if USE_TM_CLONE_REGISTRY |
| STATIC func_ptr __TMC_LIST__[] |
| __attribute__((used, section(".tm_clone_table"), aligned(__alignof__(void*)))) |
| = { }; |
| # ifdef HAVE_GAS_HIDDEN |
| extern func_ptr __TMC_END__[] __attribute__((__visibility__ ("hidden"))); |
| # endif |
| |
| static inline void |
| deregister_tm_clones (void) |
| { |
| void (*fn) (void *); |
| |
| #ifdef HAVE_GAS_HIDDEN |
| func_ptr *end = __TMC_END__; |
| // Do not optimize the comparison to false. |
| __asm ("" : "+g" (end)); |
| if (__TMC_LIST__ == end) |
| return; |
| #else |
| if (__TMC_LIST__[0] == NULL) |
| return; |
| #endif |
| |
| fn = _ITM_deregisterTMCloneTable; |
| __asm ("" : "+r" (fn)); |
| if (fn) |
| fn (__TMC_LIST__); |
| } |
| |
| static inline void |
| register_tm_clones (void) |
| { |
| void (*fn) (void *, size_t); |
| size_t size; |
| |
| #ifdef HAVE_GAS_HIDDEN |
| func_ptr *end = __TMC_END__; |
| // Do not optimize the comparison to false. |
| __asm ("" : "+g" (end)); |
| size = (end - __TMC_LIST__) / 2; |
| #else |
| for (size = 0; __TMC_LIST__[size * 2] != NULL; size++) |
| continue; |
| #endif |
| if (size == 0) |
| return; |
| |
| fn = _ITM_registerTMCloneTable; |
| __asm ("" : "+r" (fn)); |
| if (fn) |
| fn (__TMC_LIST__, size); |
| } |
| #endif /* USE_TM_CLONE_REGISTRY */ |
| |
| #if defined(__LIBGCC_INIT_SECTION_ASM_OP__) \ |
| || defined(__LIBGCC_INIT_ARRAY_SECTION_ASM_OP__) |
| |
| #ifdef OBJECT_FORMAT_ELF |
| |
| #if DEFAULT_USE_CXA_ATEXIT |
| /* Declare the __dso_handle variable. It should have a unique value |
| in every shared-object; in a main program its value is zero. The |
| object should in any case be protected. This means the instance |
| in one DSO or the main program is not used in another object. The |
| dynamic linker takes care of this. |
| If __cxa_atexit is not being used, __dso_handle will not be used and |
| doesn't need to be defined. */ |
| |
| #ifdef TARGET_LIBGCC_SDATA_SECTION |
| extern void *__dso_handle __attribute__ ((__section__ (TARGET_LIBGCC_SDATA_SECTION))); |
| #endif |
| #ifdef HAVE_GAS_HIDDEN |
| extern void *__dso_handle __attribute__ ((__visibility__ ("hidden"))); |
| #endif |
| #ifdef CRTSTUFFS_O |
| void *__dso_handle = &__dso_handle; |
| #else |
| void *__dso_handle = 0; |
| #endif |
| #endif /* DEFAULT_USE_CXA_ATEXIT */ |
| |
| /* The __cxa_finalize function may not be available so we use only a |
| weak declaration. */ |
| extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK; |
| |
| /* 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. |
| |
| On some systems, this routine is run more than once from the .fini, |
| when exit is called recursively, so we arrange to remember where in |
| the list we left off processing, and we resume at that point, |
| should we be re-invoked. |
| |
| This routine does not need to be run if none of the following clauses are |
| true, as it will not do anything, so can be removed. */ |
| #if defined(CRTSTUFFS_O) || !defined(FINI_ARRAY_SECTION_ASM_OP) \ |
| || USE_TM_CLONE_REGISTRY || defined(USE_EH_FRAME_REGISTRY) |
| static void __attribute__((used)) |
| __do_global_dtors_aux (void) |
| { |
| static _Bool completed; |
| |
| if (__builtin_expect (completed, 0)) |
| return; |
| |
| #if DEFAULT_USE_CXA_ATEXIT |
| #ifdef CRTSTUFFS_O |
| if (__cxa_finalize) |
| __cxa_finalize (__dso_handle); |
| #endif |
| #endif |
| |
| #ifdef FINI_ARRAY_SECTION_ASM_OP |
| /* If we are using .fini_array then destructors will be run via that |
| mechanism. */ |
| #elif defined(HIDDEN_DTOR_LIST_END) |
| { |
| /* Safer version that makes sure only .dtors function pointers are |
| called even if the static variable is maliciously changed. */ |
| extern func_ptr __DTOR_END__[] __attribute__((visibility ("hidden"))); |
| static size_t dtor_idx; |
| const size_t max_idx = __DTOR_END__ - __DTOR_LIST__ - 1; |
| func_ptr *dtor_list; |
| |
| __asm ("" : "=g" (dtor_list) : "0" (__DTOR_LIST__)); |
| while (dtor_idx < max_idx) |
| dtor_list[++dtor_idx] (); |
| } |
| #else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */ |
| { |
| static func_ptr *p = __DTOR_LIST__ + 1; |
| func_ptr f; |
| |
| while ((f = *p)) |
| { |
| p++; |
| f (); |
| } |
| } |
| #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */ |
| |
| #if USE_TM_CLONE_REGISTRY |
| deregister_tm_clones (); |
| #endif /* USE_TM_CLONE_REGISTRY */ |
| |
| #ifdef USE_EH_FRAME_REGISTRY |
| #ifdef CRT_GET_RFIB_DATA |
| /* If we used the new __register_frame_info_bases interface, |
| make sure that we deregister from the same place. */ |
| if (__deregister_frame_info_bases) |
| __deregister_frame_info_bases (__EH_FRAME_BEGIN__); |
| #else |
| if (__deregister_frame_info) |
| __deregister_frame_info (__EH_FRAME_BEGIN__); |
| #endif |
| #endif |
| |
| completed = 1; |
| } |
| |
| /* Stick a call to __do_global_dtors_aux into the .fini section. */ |
| #ifdef FINI_SECTION_ASM_OP |
| CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux) |
| #elif defined (FINI_ARRAY_SECTION_ASM_OP) |
| #if defined(__FDPIC__) |
| __asm__("\t.equ\t__do_global_dtors_aux_alias, __do_global_dtors_aux\n"); |
| extern char __do_global_dtors_aux_alias; |
| static void *__do_global_dtors_aux_fini_array_entry[] |
| __attribute__ ((__used__, section(".fini_array"), aligned(sizeof(void *)))) |
| = { &__do_global_dtors_aux_alias }; |
| #else /* defined(__FDPIC__) */ |
| static func_ptr __do_global_dtors_aux_fini_array_entry[] |
| __attribute__ ((__used__, section(".fini_array"), |
| aligned(__alignof__(func_ptr)))) = { __do_global_dtors_aux }; |
| #endif /* defined(__FDPIC__) */ |
| #else /* !FINI_SECTION_ASM_OP && !FINI_ARRAY_SECTION_ASM_OP */ |
| static void __attribute__((used)) |
| __do_global_dtors_aux_1 (void) |
| { |
| atexit (__do_global_dtors_aux); |
| } |
| CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__, |
| __do_global_dtors_aux_1) |
| #endif |
| #endif /* defined(CRTSTUFFS_O) || !defined(FINI_ARRAY_SECTION_ASM_OP) |
| || USE_TM_CLONE_REGISTRY || defined(USE_EH_FRAME_REGISTRY) */ |
| |
| #if defined(USE_EH_FRAME_REGISTRY) || USE_TM_CLONE_REGISTRY |
| /* Stick a call to __register_frame_info into the .init section. For some |
| reason calls with no arguments work more reliably in .init, so stick the |
| call in another function. */ |
| |
| static void __attribute__((used)) |
| frame_dummy (void) |
| { |
| #ifdef USE_EH_FRAME_REGISTRY |
| static struct object object; |
| #ifdef CRT_GET_RFIB_DATA |
| void *tbase, *dbase; |
| tbase = 0; |
| CRT_GET_RFIB_DATA (dbase); |
| if (__register_frame_info_bases) |
| __register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase); |
| #else |
| if (__register_frame_info) |
| __register_frame_info (__EH_FRAME_BEGIN__, &object); |
| #endif /* CRT_GET_RFIB_DATA */ |
| #endif /* USE_EH_FRAME_REGISTRY */ |
| |
| #if USE_TM_CLONE_REGISTRY |
| register_tm_clones (); |
| #endif /* USE_TM_CLONE_REGISTRY */ |
| } |
| |
| #ifdef __LIBGCC_INIT_SECTION_ASM_OP__ |
| CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__, frame_dummy) |
| #else /* defined(__LIBGCC_INIT_SECTION_ASM_OP__) */ |
| #if defined(__FDPIC__) |
| __asm__("\t.equ\t__frame_dummy_alias, frame_dummy\n"); |
| extern char __frame_dummy_alias; |
| static void *__frame_dummy_init_array_entry[] |
| __attribute__ ((__used__, section(".init_array"), aligned(sizeof(void *)))) |
| = { &__frame_dummy_alias }; |
| #else /* defined(__FDPIC__) */ |
| static func_ptr __frame_dummy_init_array_entry[] |
| __attribute__ ((__used__, section(".init_array"), |
| aligned(__alignof__(func_ptr)))) = { frame_dummy }; |
| #endif /* defined(__FDPIC__) */ |
| #endif /* !defined(__LIBGCC_INIT_SECTION_ASM_OP__) */ |
| #endif /* USE_EH_FRAME_REGISTRY || USE_TM_CLONE_REGISTRY */ |
| |
| #else /* OBJECT_FORMAT_ELF */ |
| |
| /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o |
| and once in crtend.o). It must be declared static to avoid a link |
| error. Here, we define __do_global_ctors as an externally callable |
| function. It is externally callable so that __main can invoke it when |
| INVOKE__main is defined. This has the additional effect of forcing cc1 |
| to switch to the .text section. */ |
| |
| static void __do_global_ctors_aux (void); |
| void |
| __do_global_ctors (void) |
| { |
| #ifdef INVOKE__main |
| /* If __main won't actually call __do_global_ctors then it doesn't matter |
| what's inside the function. The inside of __do_global_ctors_aux is |
| called automatically in that case. And the Alliant fx2800 linker |
| crashes on this reference. So prevent the crash. */ |
| __do_global_ctors_aux (); |
| #endif |
| } |
| |
| asm (__LIBGCC_INIT_SECTION_ASM_OP__); /* cc1 doesn't know that we are switching! */ |
| |
| /* A routine to invoke all of the global constructors upon entry to the |
| program. We put this into the .init section (for systems that have |
| such a thing) so that we can properly perform the construction of |
| file-scope static-storage C++ objects within shared libraries. */ |
| |
| static void __attribute__((used)) |
| __do_global_ctors_aux (void) /* prologue goes in .init section */ |
| { |
| FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */ |
| asm (__LIBGCC_TEXT_SECTION_ASM_OP__); /* don't put epilogue and body in .init */ |
| DO_GLOBAL_CTORS_BODY; |
| atexit (__do_global_dtors); |
| } |
| |
| #endif /* OBJECT_FORMAT_ELF */ |
| |
| #elif defined(HAS_INIT_SECTION) /* ! __LIBGCC_INIT_SECTION_ASM_OP__ */ |
| |
| extern void __do_global_dtors (void); |
| |
| /* This case is used by the Irix 6 port, which supports named sections but |
| not an SVR4-style .fini section. __do_global_dtors can be non-static |
| in this case because we protect it with -hidden_symbol. */ |
| |
| void |
| __do_global_dtors (void) |
| { |
| func_ptr *p, f; |
| for (p = __DTOR_LIST__ + 1; (f = *p); p++) |
| f (); |
| |
| #if USE_TM_CLONE_REGISTRY |
| deregister_tm_clones (); |
| #endif /* USE_TM_CLONE_REGISTRY */ |
| |
| #ifdef USE_EH_FRAME_REGISTRY |
| if (__deregister_frame_info) |
| __deregister_frame_info (__EH_FRAME_BEGIN__); |
| #endif |
| } |
| |
| #if defined(USE_EH_FRAME_REGISTRY) || USE_TM_CLONE_REGISTRY |
| /* A helper function for __do_global_ctors, which is in crtend.o. Here |
| in crtbegin.o, we can reference a couple of symbols not visible there. |
| Plus, since we're before libgcc.a, we have no problems referencing |
| functions from there. */ |
| void |
| __do_global_ctors_1(void) |
| { |
| #ifdef USE_EH_FRAME_REGISTRY |
| static struct object object; |
| if (__register_frame_info) |
| __register_frame_info (__EH_FRAME_BEGIN__, &object); |
| #endif |
| |
| #if USE_TM_CLONE_REGISTRY |
| register_tm_clones (); |
| #endif /* USE_TM_CLONE_REGISTRY */ |
| } |
| #endif /* USE_EH_FRAME_REGISTRY || USE_TM_CLONE_REGISTRY */ |
| |
| #else /* ! __LIBGCC_INIT_SECTION_ASM_OP__ && ! HAS_INIT_SECTION */ |
| #error "What are you doing with crtstuff.c, then?" |
| #endif |
| |
| #elif defined(CRT_END) /* ! CRT_BEGIN */ |
| |
| /* No need for .ctors/.dtors section if linker can place them in |
| .init_array/.fini_array section. */ |
| #ifndef USE_INITFINI_ARRAY |
| /* 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. */ |
| |
| #ifdef CTOR_LIST_END |
| CTOR_LIST_END; |
| #elif defined(__LIBGCC_CTORS_SECTION_ASM_OP__) |
| /* Hack: force cc1 to switch to .data section early, so that assembling |
| __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ |
| static func_ptr force_to_data[1] __attribute__ ((__used__)) = { }; |
| asm (__LIBGCC_CTORS_SECTION_ASM_OP__); |
| STATIC func_ptr __CTOR_END__[1] |
| __attribute__((aligned(__alignof__(func_ptr)))) |
| = { (func_ptr) 0 }; |
| #else |
| STATIC func_ptr __CTOR_END__[1] |
| __attribute__((section(".ctors"), aligned(__alignof__(func_ptr)))) |
| = { (func_ptr) 0 }; |
| #endif |
| |
| #ifdef DTOR_LIST_END |
| DTOR_LIST_END; |
| #elif defined(HIDDEN_DTOR_LIST_END) |
| #ifdef __LIBGCC_DTORS_SECTION_ASM_OP__ |
| asm (__LIBGCC_DTORS_SECTION_ASM_OP__); |
| #endif |
| func_ptr __DTOR_END__[1] |
| __attribute__ ((used, |
| #ifndef __LIBGCC_DTORS_SECTION_ASM_OP__ |
| section(".dtors"), |
| #endif |
| aligned(__alignof__(func_ptr)), visibility ("hidden"))) |
| = { (func_ptr) 0 }; |
| #elif defined(__LIBGCC_DTORS_SECTION_ASM_OP__) |
| asm (__LIBGCC_DTORS_SECTION_ASM_OP__); |
| STATIC func_ptr __DTOR_END__[1] |
| __attribute__ ((used, aligned(__alignof__(func_ptr)))) |
| = { (func_ptr) 0 }; |
| #else |
| STATIC func_ptr __DTOR_END__[1] |
| __attribute__((used, section(".dtors"), aligned(__alignof__(func_ptr)))) |
| = { (func_ptr) 0 }; |
| #endif |
| #endif /* USE_INITFINI_ARRAY */ |
| |
| #ifdef __LIBGCC_EH_FRAME_SECTION_NAME__ |
| /* Terminate the frame unwind info section with a 4byte 0 as a sentinel; |
| this would be the 'length' field in a real FDE. */ |
| # if __INT_MAX__ == 2147483647 |
| typedef int int32; |
| # elif __LONG_MAX__ == 2147483647 |
| typedef long int32; |
| # elif __SHRT_MAX__ == 2147483647 |
| typedef short int32; |
| # else |
| # error "Missing a 4 byte integer" |
| # endif |
| STATIC EH_FRAME_SECTION_CONST int32 __FRAME_END__[] |
| __attribute__ ((used, section(__LIBGCC_EH_FRAME_SECTION_NAME__), |
| aligned(__alignof__(int32)))) |
| = { 0 }; |
| #endif /* __LIBGCC_EH_FRAME_SECTION_NAME__ */ |
| |
| #if USE_TM_CLONE_REGISTRY |
| # ifndef HAVE_GAS_HIDDEN |
| static |
| # endif |
| func_ptr __TMC_END__[] |
| __attribute__((used, section(".tm_clone_table"), |
| aligned(__alignof__(void *)))) |
| # ifdef HAVE_GAS_HIDDEN |
| __attribute__((__visibility__ ("hidden"))) = { }; |
| # else |
| = { 0, 0 }; |
| # endif |
| #endif /* USE_TM_CLONE_REGISTRY */ |
| |
| #ifdef __LIBGCC_INIT_ARRAY_SECTION_ASM_OP__ |
| |
| /* If we are using .init_array, there is nothing to do. */ |
| |
| #elif defined(__LIBGCC_INIT_SECTION_ASM_OP__) |
| |
| #ifdef OBJECT_FORMAT_ELF |
| static void __attribute__((used)) |
| __do_global_ctors_aux (void) |
| { |
| func_ptr *p; |
| for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) |
| (*p) (); |
| } |
| |
| /* Stick a call to __do_global_ctors_aux into the .init section. */ |
| CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__, __do_global_ctors_aux) |
| #else /* OBJECT_FORMAT_ELF */ |
| |
| /* Stick the real initialization code, followed by a normal sort of |
| function epilogue at the very end of the .init section for this |
| entire root executable file or for this entire shared library file. |
| |
| Note that we use some tricks here to get *just* the body and just |
| a function epilogue (but no function prologue) into the .init |
| section of the crtend.o file. Specifically, we switch to the .text |
| section, start to define a function, and then we switch to the .init |
| section just before the body code. |
| |
| Earlier on, we put the corresponding function prologue into the .init |
| section of the crtbegin.o file (which will be linked in first). |
| |
| Note that we want to invoke all constructors for C++ file-scope static- |
| storage objects AFTER any other possible initialization actions which |
| may be performed by the code in the .init section contributions made by |
| other libraries, etc. That's because those other initializations may |
| include setup operations for very primitive things (e.g. initializing |
| the state of the floating-point coprocessor, etc.) which should be done |
| before we start to execute any of the user's code. */ |
| |
| static void |
| __do_global_ctors_aux (void) /* prologue goes in .text section */ |
| { |
| asm (__LIBGCC_INIT_SECTION_ASM_OP__); |
| DO_GLOBAL_CTORS_BODY; |
| atexit (__do_global_dtors); |
| } /* epilogue and body go in .init section */ |
| |
| FORCE_CODE_SECTION_ALIGN |
| asm (__LIBGCC_TEXT_SECTION_ASM_OP__); |
| |
| #endif /* OBJECT_FORMAT_ELF */ |
| |
| #elif defined(HAS_INIT_SECTION) /* ! __LIBGCC_INIT_SECTION_ASM_OP__ */ |
| |
| extern void __do_global_ctors (void); |
| |
| /* This case is used by the Irix 6 port, which supports named sections but |
| not an SVR4-style .init section. __do_global_ctors can be non-static |
| in this case because we protect it with -hidden_symbol. */ |
| void |
| __do_global_ctors (void) |
| { |
| func_ptr *p; |
| #if defined(USE_EH_FRAME_REGISTRY) || USE_TM_CLONE_REGISTRY |
| __do_global_ctors_1(); |
| #endif |
| for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) |
| (*p) (); |
| } |
| |
| #else /* ! __LIBGCC_INIT_SECTION_ASM_OP__ && ! HAS_INIT_SECTION */ |
| #error "What are you doing with crtstuff.c, then?" |
| #endif |
| |
| #else /* ! CRT_BEGIN && ! CRT_END */ |
| #error "One of CRT_BEGIN or CRT_END must be defined." |
| #endif |