/* Specialized bits of code needed to support construction and
destruction of file-scope objects in C++ code.
- Copyright (C) 1991, 1994, 1995, 1996 Free Software Foundation, Inc.
+ Copyright (C) 1991, 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
Contributed by Ron Guilmette (rfg@monkeys.com).
This file is part of GNU CC.
do not apply. */
#include "tm.h"
+#include "defaults.h"
+#include <stddef.h>
+#include "frame.h"
/* Provide default definitions for the pseudo-ops used to switch to the
.ctors and .dtors sections.
#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
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. */
+ 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 ()
{
- func_ptr *p;
- for (p = __DTOR_LIST__ + 1; *p; p++)
- (*p) ();
+ 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
+ __deregister_frame (__EH_FRAME_BEGIN__);
+#endif
+ completed = 1;
}
+
/* Stick a call to __do_global_dtors_aux into the .fini section. */
+
static void
fini_dummy ()
{
asm (TEXT_SECTION_ASM_OP);
}
+#ifdef EH_FRAME_SECTION_ASM_OP
+/* Stick a call to __register_frame 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 ()
+{
+ static struct object object;
+ __register_frame (__EH_FRAME_BEGIN__, &object);
+}
+
+static void
+init_dummy ()
+{
+ 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
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 ()
{
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. */
+ to expand into the code needed to undo the actions of the crti.o file. */
#ifdef INIT_SECTION_PREAMBLE
INIT_SECTION_PREAMBLE;
}
#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 ()
+{
+ func_ptr *p;
+ for (p = __DTOR_LIST__ + 1; *p; p++)
+ (*p) ();
+
+#ifdef EH_FRAME_SECTION_ASM_OP
+ __deregister_frame (__EH_FRAME_BEGIN__);
+#endif
+}
+#endif
+
#endif /* defined(INIT_SECTION_ASM_OP) */
/* Force cc1 to switch to .data section. */
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
}
/* Stick a call to __do_global_ctors_aux into the .init section. */
+
static void
init_dummy ()
{
#endif
asm (TEXT_SECTION_ASM_OP);
-/* This is a kludge. The i386 Linux dynamic linker needs ___brk_addr,
+/* 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. */
+ code is never reached. */
#if defined(__linux__) && defined(__PIC__) && defined(__i386__)
{
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. */
+ before we start to execute any of the user's code. */
static void
__do_global_ctors_aux () /* prologue goes in .text section */
#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. */
+extern char __EH_FRAME_BEGIN__[];
+static func_ptr __CTOR_END__[];
+void
+__do_global_ctors ()
+{
+ func_ptr *p;
+#ifdef EH_FRAME_SECTION_ASM_OP
+ static struct oobject object;
+ __register_frame (__EH_FRAME_BEGIN__, &object);
+#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 __DTOR_END__[1] = { (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__[] = { 0 };
+#endif /* EH_FRAME_SECTION */
+
#endif /* defined(CRT_END) */
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