FSF GCC version 2.7.2

1 files changed, 324 insertions, 0 deletions

diff --git a/gnu/usr.bin/gcc/crtstuff.c b/gnu/usr.bin/gcc/crtstuff.c
new file mode 100644
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+++ b/gnu/usr.bin/gcc/crtstuff.c
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+/* Specialized bits of code needed to support construction and
+   destruction of file-scope objects in C++ code.
+
+   Written by Ron Guilmette (rfg@netcom.com) with help from Richard Stallman.
+
+Copyright (C) 1991, 1994, 1995 Free Software Foundation, Inc.
+
+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"
+
+/* 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
+
+#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.  */
+
+static func_ptr __DTOR_LIST__[];
+static void
+__do_global_dtors_aux ()
+{
+  func_ptr *p;
+  for (p = __DTOR_LIST__ + 1; *p; p++)
+    (*p) ();
+}
+
+/* Stick a call to __do_global_dtors_aux into the .fini section.  */
+static void
+fini_dummy ()
+{
+  asm (FINI_SECTION_ASM_OP);
+  __do_global_dtors_aux ();
+#ifdef FORCE_FINI_SECTION_ALIGN
+  FORCE_FINI_SECTION_ALIGN;
+#endif
+  asm (TEXT_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 ()
+{
+#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 ()	/* 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 */
+#endif /* defined(INIT_SECTION_ASM_OP) */
+
+/* Force cc1 to switch to .data section.  */
+static func_ptr force_to_data[0] = { };
+
+/* 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] = { (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
+
+#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 ()
+{
+  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
+init_dummy ()
+{
+  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 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__)
+  {
+    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 ()	/* 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 */
+
+#endif /* OBJECT_FORMAT_ELF */
+
+#endif /* defined(INIT_SECTION_ASM_OP) */
+
+/* Force cc1 to switch to .data section.  */
+static func_ptr force_to_data[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.  */
+
+#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] = { (func_ptr) 0 };
+#endif
+
+#endif /* defined(CRT_END) */