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* elf/Makefile: Add rules to build and run initfirst test. * elf/initfirst.c: New file. * elf/firstobj.c: New file.
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Ulrich Drepper
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Feb 2, 2001
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| #include <errno.h> | ||
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| int | ||
| foo (void) | ||
| { | ||
| errno = 0; | ||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| #include <dlfcn.h> | ||
| #include <stdio.h> | ||
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|
||
| int | ||
| main (void) | ||
| { | ||
| void *h = dlopen ("firstobj.so", RTLD_LAZY); | ||
| void *f; | ||
| if (! h) | ||
| { | ||
| printf ("cannot find firstobj.so: %s\n", dlerror ()); | ||
| return 1; | ||
| } | ||
| f = dlsym (h, "foo"); | ||
| if (! f) | ||
| { | ||
| printf ("cannot find symbol foo: %s\n", dlerror ()); | ||
| return 2; | ||
| } | ||
| ((void (*) (void)) f) (); | ||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| ifeq ($(subdir),linuxthreads) | ||
| # On i686 we must avoid generating the trampoline functions generated | ||
| # to get the GOT pointer. | ||
| CFLAGS-pt-initfini.s += -march=i386 -mcpu=i386 | ||
| endif |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,140 @@ | ||
| /* Special .init and .fini section support. Linuxthread version. | ||
| Copyright (C) 1995, 1996, 1997, 2000, 2001 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 Library General Public | ||
| License as published by the Free Software Foundation; either | ||
| version 2 of the License, or (at your option) any later version. | ||
| In addition to the permissions in the GNU Library 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 Library 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 Library General Public License for more details. | ||
| You should have received a copy of the GNU Library General Public | ||
| License along with the GNU C Library; see the file COPYING.LIB. If not, | ||
| write to the Free Software Foundation, 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 <stdlib.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 ) | ||
|
|
||
| /* Embed an #include to pull in the alignment and .end directives. */ | ||
| asm ("\n#include \"defs.h\""); | ||
|
|
||
| /* 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*/"); | ||
|
|
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| static void | ||
| call_initialize_minimal (void) | ||
| { | ||
| __pthread_initialize_minimal (); | ||
| } | ||
|
|
||
| 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 (); | ||
| } | ||
|
|
||
| SECTION (".init"); | ||
| extern void _init (void); | ||
| void | ||
| _init (void) | ||
| { | ||
| /* The very first thing we must do is to set up the registers. */ | ||
| call_initialize_minimal (); | ||
|
|
||
| /* 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 (); | ||
|
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| asm ("ALIGN"); | ||
| asm("END_INIT"); | ||
| /* Now the epilog. */ | ||
| asm ("\n/*@_init_PROLOG_ENDS*/"); | ||
| asm ("\n/*@_init_EPILOG_BEGINS*/"); | ||
| SECTION(".init"); | ||
| } | ||
| asm ("END_INIT"); | ||
|
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||
| /* End of the _init epilog, beginning of the _fini prolog. */ | ||
| asm ("\n/*@_init_EPILOG_ENDS*/"); | ||
| asm ("\n/*@_fini_PROLOG_BEGINS*/"); | ||
|
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| SECTION (".fini"); | ||
| extern void _fini (void); | ||
| void | ||
| _fini (void) | ||
| { | ||
|
|
||
| /* End of the _fini prolog. */ | ||
| 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. */ | ||
| extern void i_am_not_a_leaf (void); | ||
| i_am_not_a_leaf (); | ||
| } | ||
|
|
||
| /* Beginning of the _fini epilog. */ | ||
| asm ("\n/*@_fini_EPILOG_BEGINS*/"); | ||
| SECTION (".fini"); | ||
| } | ||
| asm ("END_FINI"); | ||
|
|
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| /* 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. */ |