/* Special .init and .fini section support. Copyright (C) 1995, 1996, 1997, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. In addition to the permissions in the GNU Lesser General Public License, the Free Software Foundation gives you unlimited permission to link the compiled version of this file with other programs, and to distribute those programs without any restriction coming from the use of this file. (The GNU Lesser General Public License restrictions do apply in other respects; for example, they cover modification of the file, and distribution when not linked into another program.) The GNU C Library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ /* This file is compiled into assembly code which is then munged by a sed script into two files: crti.s and crtn.s. * crti.s puts a function prologue at the beginning of the .init and .fini sections and defines global symbols for those addresses, so they can be called as functions. * crtn.s puts the corresponding function epilogues in the .init and .fini sections. */ #include <features.h> /* We use embedded asm for .section unconditionally, as this makes it easier to insert the necessary directives into crtn.S. */ #define SECTION(x) asm (".section " x ); /* Declare symbols as hidden. Hidden symbols are only seen by * the link editor and not by the dynamic loader. */ #ifdef __HAVE_DOT_HIDDEN__ # define HIDDEN(func) asm (".hidden " #func ); #else # define HIDDEN(func) #endif #if defined(__sh__) && !defined(__SH5__) /* The macro insert this sh specific stuff: @_SH_GLB_BEGINS bra 1f nop ALIGN @func_SH_GLB_LABEL 1: @_SH_GLB_ENDS */ #define GLB_STUFF(func) asm ("\n/*@_SH_GLB_BEGINS*/"); \ asm ("\n\tbra\t1f\n\tnop\n\tALIGN\n/*@" #func"_SH_GLB_LABEL*/\n1:"); \ asm ("\n/*@_SH_GLB_ENDS*/"); #else #define GLB_STUFF(func) #endif /* The initial common code ends here. */ asm ("\n/*@HEADER_ENDS*/"); /* To determine whether we need .end and .align: */ //asm ("\n/*@TESTS_BEGIN*/"); extern void dummy (void (*foo) (void)); void dummy (void (*foo) (void)) { if (foo) (*foo) (); } //asm ("\n/*@TESTS_END*/"); /* The beginning of _init: */ asm ("\n/*@_init_PROLOG_BEGINS*/"); #ifdef GMON_SUPPORT asm ("\n/*@_init_GMON_STUFF_BEGINS*/"); static void call_gmon_start(void) { extern void __gmon_start__ (void) __attribute__ ((weak)); /*weak_extern (__gmon_start__);*/ void (*gmon_start) (void) = __gmon_start__; if (gmon_start) gmon_start (); } asm ("\n/*@_init_GMON_STUFF_PAUSES*/"); #endif SECTION (".init") HIDDEN(_init) extern void i_am_not_a_leaf (void); extern void _init (void); void _init (void) { #ifdef GMON_SUPPORT asm ("\n/*@_init_GMON_STUFF_UNPAUSES*/"); /* We cannot use the normal constructor mechanism in gcrt1.o because it appears before crtbegin.o in the link, so the header elt of .ctors would come after the elt for __gmon_start__. One approach is for gcrt1.o to reference a symbol which would be defined by some library module which has a constructor; but then user code's constructors would come first, and not be profiled. */ call_gmon_start (); asm ("\n/*@_init_GMON_STUFF_ENDS*/"); #else asm ("\n/*@_init_PROLOG_PAUSES*/"); { /* Let GCC know that _init is not a leaf function by having a dummy * function call here. We arrange for this call to be omitted from * either crt file. */ i_am_not_a_leaf (); } asm ("\n/*@_init_PROLOG_UNPAUSES*/"); #endif GLB_STUFF(_init) asm ("ALIGN"); asm("END_INIT"); /* Now the epilog. */ asm ("\n/*@_init_PROLOG_ENDS*/"); asm ("\n/*@_init_EPILOG_BEGINS*/"); } /* End of the _init epilog, beginning of the _fini prolog. */ asm ("\n/*@_init_EPILOG_ENDS*/"); asm ("\n/*@_fini_PROLOG_BEGINS*/"); SECTION (".fini") HIDDEN(_fini) extern void i_am_not_a_leaf2 (void); extern void _fini (void); void _fini (void) { /* End of the _fini prolog. */ GLB_STUFF(_fini) asm ("ALIGN"); asm ("END_FINI"); asm ("\n/*@_fini_PROLOG_ENDS*/"); { /* Let GCC know that _fini is not a leaf function by having a dummy function call here. We arrange for this call to be omitted from either crt file. */ i_am_not_a_leaf2 (); } /* Beginning of the _fini epilog. */ asm ("\n/*@_fini_EPILOG_BEGINS*/"); } /* End of the _fini epilog. Any further generated assembly (e.g. .ident) is shared between both crt files. */ asm ("\n/*@_fini_EPILOG_ENDS*/"); asm ("\n/*@TRAILER_BEGINS*/"); /* End of file. */