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Diffstat (limited to 'contrib/gcc/crtstuff.c')
| -rw-r--r-- | contrib/gcc/crtstuff.c | 564 |
1 files changed, 0 insertions, 564 deletions
diff --git a/contrib/gcc/crtstuff.c b/contrib/gcc/crtstuff.c deleted file mode 100644 index ccebde1d2c98..000000000000 --- a/contrib/gcc/crtstuff.c +++ /dev/null @@ -1,564 +0,0 @@ -/* Specialized bits of code needed to support construction and - destruction of file-scope objects in C++ code. - Copyright (C) 1991, 94, 95, 96, 97, 1998 Free Software Foundation, Inc. - Contributed by Ron Guilmette (rfg@monkeys.com). - -This file is part of GNU CC. - -GNU CC 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 2, or (at your option) -any later version. - -GNU CC 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. - -You should have received a copy of the GNU General Public License -along with GNU CC; see the file COPYING. If not, write to -the Free Software Foundation, 59 Temple Place - Suite 330, -Boston, MA 02111-1307, USA. */ - -/* As a special exception, if you link this library with files - compiled with GCC to produce an executable, this does not cause - the resulting executable to be covered by the GNU General Public License. - This exception does not however invalidate any other reasons why - the executable file might be covered by the GNU General Public License. */ - -/* This file is a bit like libgcc1.c/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. */ - -/* It is incorrect to include config.h here, because this file is being - compiled for the target, and hence definitions concerning only the host - do not apply. */ - -#include "tm.h" -#include "defaults.h" -#include <stddef.h> -#include "frame.h" - -/* We do not want to add the weak attribute to the declarations of these - routines in frame.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 -- ie, 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 (void *, struct object *) - TARGET_ATTRIBUTE_WEAK; - -extern void *__deregister_frame_info (void *) - TARGET_ATTRIBUTE_WEAK; - -#ifndef OBJECT_FORMAT_MACHO - -/* Provide default definitions for the pseudo-ops used to switch to the - .ctors and .dtors sections. - - Note that we want to give these sections the SHF_WRITE attribute - because these sections will actually contain data (i.e. tables of - addresses of functions in the current root executable or shared library - file) and, in the case of a shared library, the relocatable addresses - will have to be properly resolved/relocated (and then written into) by - the dynamic linker when it actually attaches the given shared library - to the executing process. (Note that on SVR4, you may wish to use the - `-z text' option to the ELF linker, when building a shared library, as - an additional check that you are doing everything right. But if you do - use the `-z text' option when building a shared library, you will get - errors unless the .ctors and .dtors sections are marked as writable - via the SHF_WRITE attribute.) */ - -#ifndef CTORS_SECTION_ASM_OP -#define CTORS_SECTION_ASM_OP ".section\t.ctors,\"aw\"" -#endif -#ifndef DTORS_SECTION_ASM_OP -#define DTORS_SECTION_ASM_OP ".section\t.dtors,\"aw\"" -#endif -#if !defined (EH_FRAME_SECTION_ASM_OP) && defined (DWARF2_UNWIND_INFO) && defined(ASM_OUTPUT_SECTION_NAME) -#define EH_FRAME_SECTION_ASM_OP ".section\t.eh_frame,\"aw\"" -#endif - -#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" - -#ifndef ON_EXIT -#define ON_EXIT(a, b) -#endif -#define STATIC - -#endif /* OBJECT_FORMAT_ELF */ - -#ifdef CRT_BEGIN - -#ifdef INIT_SECTION_ASM_OP - -#ifdef OBJECT_FORMAT_ELF - -/* 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. */ - -static char __EH_FRAME_BEGIN__[]; -static func_ptr __DTOR_LIST__[]; -static void -__do_global_dtors_aux (void) -{ - static func_ptr *p = __DTOR_LIST__ + 1; - static int completed = 0; - - if (completed) - return; - - while (*p) - { - p++; - (*(p-1)) (); - } - -#ifdef EH_FRAME_SECTION_ASM_OP - if (__deregister_frame_info) - __deregister_frame_info (__EH_FRAME_BEGIN__); -#endif - completed = 1; -} - - -/* Stick a call to __do_global_dtors_aux into the .fini section. */ - -static void __attribute__ ((__unused__)) -fini_dummy (void) -{ - asm (FINI_SECTION_ASM_OP); - __do_global_dtors_aux (); -#ifdef FORCE_FINI_SECTION_ALIGN - FORCE_FINI_SECTION_ALIGN; -#endif - asm (TEXT_SECTION_ASM_OP); -} - -#ifdef EH_FRAME_SECTION_ASM_OP -/* 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 -frame_dummy (void) -{ - static struct object object; - if (__register_frame_info) - __register_frame_info (__EH_FRAME_BEGIN__, &object); -} - -static void __attribute__ ((__unused__)) -init_dummy (void) -{ - asm (INIT_SECTION_ASM_OP); - frame_dummy (); -#ifdef FORCE_INIT_SECTION_ALIGN - FORCE_INIT_SECTION_ALIGN; -#endif - asm (TEXT_SECTION_ASM_OP); -} -#endif /* EH_FRAME_SECTION_ASM_OP */ - -#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 -__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 (INIT_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */ - -/* On some svr4 systems, the initial .init section preamble code provided in - crti.o may do something, such as bump the stack, which we have to - undo before we reach the function prologue code for __do_global_ctors - (directly below). For such systems, define the macro INIT_SECTION_PREAMBLE - to expand into the code needed to undo the actions of the crti.o file. */ - -#ifdef INIT_SECTION_PREAMBLE - INIT_SECTION_PREAMBLE; -#endif - -/* 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 -__do_global_ctors_aux (void) /* prologue goes in .init section */ -{ -#ifdef FORCE_INIT_SECTION_ALIGN - FORCE_INIT_SECTION_ALIGN; /* Explicit align before switch to .text */ -#endif - asm (TEXT_SECTION_ASM_OP); /* don't put epilogue and body in .init */ - DO_GLOBAL_CTORS_BODY; - ON_EXIT (__do_global_dtors, 0); -} - -#endif /* OBJECT_FORMAT_ELF */ - -#else /* defined(INIT_SECTION_ASM_OP) */ - -#ifdef HAS_INIT_SECTION -/* 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. */ - -static char __EH_FRAME_BEGIN__[]; -static func_ptr __DTOR_LIST__[]; -void -__do_global_dtors (void) -{ - func_ptr *p; - for (p = __DTOR_LIST__ + 1; *p; p++) - (*p) (); - -#ifdef EH_FRAME_SECTION_ASM_OP - if (__deregister_frame_info) - __deregister_frame_info (__EH_FRAME_BEGIN__); -#endif -} - -#ifdef EH_FRAME_SECTION_ASM_OP -/* Define a function here to call __register_frame. crtend.o is linked in - after libgcc.a, and hence can't call libgcc.a functions directly. That - can lead to unresolved function references. */ -void -__frame_dummy (void) -{ - static struct object object; - if (__register_frame_info) - __register_frame_info (__EH_FRAME_BEGIN__, &object); -} -#endif -#endif - -#endif /* defined(INIT_SECTION_ASM_OP) */ - -/* Force cc1 to switch to .data section. */ -static func_ptr force_to_data[0] __attribute__ ((__unused__)) = { }; - -/* 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. */ - -/* 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; -#else -asm (CTORS_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */ -STATIC func_ptr __CTOR_LIST__[1] __attribute__ ((__unused__)) - = { (func_ptr) (-1) }; -#endif - -#ifdef DTOR_LIST_BEGIN -DTOR_LIST_BEGIN; -#else -asm (DTORS_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */ -STATIC func_ptr __DTOR_LIST__[1] = { (func_ptr) (-1) }; -#endif - -#ifdef EH_FRAME_SECTION_ASM_OP -/* Stick a label at the beginning of the frame unwind info so we can register - and deregister it with the exception handling library code. */ - -asm (EH_FRAME_SECTION_ASM_OP); -#ifdef INIT_SECTION_ASM_OP -STATIC -#endif -char __EH_FRAME_BEGIN__[] = { }; -#endif /* EH_FRAME_SECTION_ASM_OP */ - -#endif /* defined(CRT_BEGIN) */ - -#ifdef CRT_END - -#ifdef INIT_SECTION_ASM_OP - -#ifdef OBJECT_FORMAT_ELF - -static func_ptr __CTOR_END__[]; -static void -__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. */ - -static void __attribute__ ((__unused__)) -init_dummy (void) -{ - asm (INIT_SECTION_ASM_OP); - __do_global_ctors_aux (); -#ifdef FORCE_INIT_SECTION_ALIGN - FORCE_INIT_SECTION_ALIGN; -#endif - asm (TEXT_SECTION_ASM_OP); - -/* This is a kludge. The i386 GNU/Linux dynamic linker needs ___brk_addr, - __environ and atexit (). We have to make sure they are in the .dynsym - section. We accomplish it by making a dummy call here. This - code is never reached. */ - -#if defined(__linux__) && defined(__PIC__) && defined(__i386__) - { - extern void *___brk_addr; - extern char **__environ; - - ___brk_addr = __environ; - atexit (); - } -#endif -} - -#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 (INIT_SECTION_ASM_OP); - DO_GLOBAL_CTORS_BODY; - ON_EXIT (__do_global_dtors, 0); -} /* epilogue and body go in .init section */ - -#ifdef FORCE_INIT_SECTION_ALIGN -FORCE_INIT_SECTION_ALIGN; -#endif - -asm (TEXT_SECTION_ASM_OP); - -#endif /* OBJECT_FORMAT_ELF */ - -#else /* defined(INIT_SECTION_ASM_OP) */ - -#ifdef HAS_INIT_SECTION -/* 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. */ -static func_ptr __CTOR_END__[]; -#ifdef EH_FRAME_SECTION_ASM_OP -extern void __frame_dummy (void); -#endif -void -__do_global_ctors (void) -{ - func_ptr *p; -#ifdef EH_FRAME_SECTION_ASM_OP - __frame_dummy (); -#endif - for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) - (*p) (); -} -#endif - -#endif /* defined(INIT_SECTION_ASM_OP) */ - -/* Force cc1 to switch to .data section. */ -static func_ptr force_to_data[0] __attribute__ ((__unused__)) = { }; - -/* 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; -#else -asm (CTORS_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */ -STATIC func_ptr __CTOR_END__[1] = { (func_ptr) 0 }; -#endif - -#ifdef DTOR_LIST_END -DTOR_LIST_END; -#else -asm (DTORS_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */ -STATIC func_ptr __DTOR_END__[1] __attribute__ ((__unused__)) - = { (func_ptr) 0 }; -#endif - -#ifdef EH_FRAME_SECTION_ASM_OP -/* Terminate the frame unwind info section with a 4byte 0 as a sentinel; - this would be the 'length' field in a real FDE. */ - -typedef unsigned int ui32 __attribute__ ((mode (SI))); -asm (EH_FRAME_SECTION_ASM_OP); -STATIC ui32 __FRAME_END__[] __attribute__ ((__unused__)) = { 0 }; -#endif /* EH_FRAME_SECTION */ - -#endif /* defined(CRT_END) */ - -#else /* OBJECT_FORMAT_MACHO */ - -/* For Mach-O format executables, we assume that the system's runtime is - smart enough to handle constructors and destructors, but doesn't have - an init section (if it can't even handle constructors/destructors - you should be using INVOKE__main, not crtstuff). All we need to do - is install/deinstall the frame information for exceptions. We do this - by putting a constructor in crtbegin.o and a destructor in crtend.o. - - crtend.o also puts in the terminating zero in the frame information - segment. */ - -/* The crtstuff for other object formats use the symbol __EH_FRAME_BEGIN__ - to figure out the start of the exception frame, but here we use - getsectbynamefromheader to find this value. Either method would work, - but this method avoids creating any global symbols, which seems - cleaner. */ - -#include <mach-o/ldsyms.h> -extern const struct section * - getsectbynamefromheader (const struct mach_header *, - const char *, const char *); - -#ifdef CRT_BEGIN - -static void __reg_frame_ctor () __attribute__ ((constructor)); - -static void -__reg_frame_ctor (void) -{ - static struct object object; - const struct section *eh_frame; - - eh_frame = getsectbynamefromheader (&_mh_execute_header, - "__TEXT", "__eh_frame"); - __register_frame_info ((void *) eh_frame->addr, &object); -} - -#endif /* CRT_BEGIN */ - -#ifdef CRT_END - -static void __dereg_frame_dtor () __attribute__ ((destructor)); - -static -void -__dereg_frame_dtor (void) -{ - const struct section *eh_frame; - - eh_frame = getsectbynamefromheader (&_mh_execute_header, - "__TEXT", "__eh_frame"); - __deregister_frame_info ((void *) eh_frame->addr); -} - -/* Terminate the frame section with a final zero. */ - -/* Force cc1 to switch to .data section. */ -static void * force_to_data[0] __attribute__ ((__unused__)) = { }; - -typedef unsigned int ui32 __attribute__ ((mode (SI))); -asm (EH_FRAME_SECTION_ASM_OP); -static ui32 __FRAME_END__[] __attribute__ ((__unused__)) = { 0 }; - -#endif /* CRT_END */ - -#endif /* OBJECT_FORMAT_MACHO */ - |