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Thu Jun 13 00:02:25 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>

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* elf/dl-lookup.c (_dl_lookup_symbol): If no value and *REF is
	null, consider it a strong reference and give the error.

Wed Jun 12 15:52:46 1996  Roland McGrath  <roland@delasyd.gnu.ai.mit.edu>

	* elf/dl-open.c (_dl_open): Correctly terminate relocating loop
 	after relocating NEW when it's the only new object.

	* elf/dl-init.c (_dl_init_next): When out of initializers, set
 	_r_debug.r_state to RT_CONSISTENT and call _dl_debug_state just
 	before return.

	* elf/rtld.c (dl_main): Move _dl_debug_initialize call after
 	relocation.  Call it unconditionally and only fill in DT_DEBUG
 	if it's present.  Then call _dl_debug_state with r_state RT_ADD
 	before running initializers.

	* elf/dl-open.c (_dl_open): Call _dl_debug_initialize and then call
 	_dl_debug_state with r_state RT_ADD before running initializers
	* elf/dl-close.c (_dl_close): Call _dl_debug_state with r_state
 	RT_DELETE before running finalizers and with RT_CONSISTENT just
 	before return.

	* elf/Makefile (dl-routines): Add dl-debug.
	* elf/dl-debug.c: New file.
	* elf/rtld.c (_dl_r_debug): Rename to _r_debug and move to dl-debug.c.
	(_dl_r_debug_state): Rename to _dl_debug_state and likewise move.
	(dl_main): Use _dl_debug_initialize.
	* elf/link.h: Fix name to _dl_debug_state in decl.
	(_dl_debug_initialize): Declare new function from dl-debug.c.
	(_r_debug): Declare it.

	* Makerules (distinfo-vars): Add install-{lib,data,bin,sbin,others}.
	In distinfo set $(subdir)-VAR and then set VAR to $($(subdir)-VAR).

	* Makeconfig (rpath-link): New variable; add $(elfobjdir).
	(default-rpath): Use it.
	(built-program-cmd): Use it in LD_LIBRARY_PATH.

	* Makeconfig (sysdep-configures): Prepend $(sysdep_dir) to names tried.

	* sysdeps/unix/Dist: Add make-syscalls.sh.

	* misc/Makefile (headers): Add sys/swap.h.
	* posix/unistd.h: Remove decls for swapon, swapoff.
	* sysdeps/generic/sys/swap.h: New file.
	* sysdeps/unix/sysv/linux/sys/swap.h: New file.

	* sysdeps/unix/sysv/linux/gnu/types.h: Remove temporary hack #define
	of __kernel_fsid_t.  It is correctly defines in <linux/types.h> now.
This commit is contained in:
Roland McGrath 1996-06-13 04:06:45 +00:00
parent 4d5da9a654
commit 4d6acc61fa
17 changed files with 256 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
ChangeLog
View File

@ -1,3 +1,56 @@
Thu Jun 13 00:02:25 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* elf/dl-lookup.c (_dl_lookup_symbol): If no value and *REF is
null, consider it a strong reference and give the error.
Wed Jun 12 15:52:46 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* elf/dl-open.c (_dl_open): Correctly terminate relocating loop
after relocating NEW when it's the only new object.
* elf/dl-init.c (_dl_init_next): When out of initializers, set
_r_debug.r_state to RT_CONSISTENT and call _dl_debug_state just
before return.
* elf/rtld.c (dl_main): Move _dl_debug_initialize call after
relocation. Call it unconditionally and only fill in DT_DEBUG
if it's present. Then call _dl_debug_state with r_state RT_ADD
before running initializers.
* elf/dl-open.c (_dl_open): Call _dl_debug_initialize and then call
_dl_debug_state with r_state RT_ADD before running initializers
* elf/dl-close.c (_dl_close): Call _dl_debug_state with r_state
RT_DELETE before running finalizers and with RT_CONSISTENT just
before return.
* elf/Makefile (dl-routines): Add dl-debug.
* elf/dl-debug.c: New file.
* elf/rtld.c (_dl_r_debug): Rename to _r_debug and move to dl-debug.c.
(_dl_r_debug_state): Rename to _dl_debug_state and likewise move.
(dl_main): Use _dl_debug_initialize.
* elf/link.h: Fix name to _dl_debug_state in decl.
(_dl_debug_initialize): Declare new function from dl-debug.c.
(_r_debug): Declare it.
* Makerules (distinfo-vars): Add install-{lib,data,bin,sbin,others}.
In distinfo set $(subdir)-VAR and then set VAR to $($(subdir)-VAR).
* Makeconfig (rpath-link): New variable; add $(elfobjdir).
(default-rpath): Use it.
(built-program-cmd): Use it in LD_LIBRARY_PATH.
* Makeconfig (sysdep-configures): Prepend $(sysdep_dir) to names tried.
* sysdeps/unix/Dist: Add make-syscalls.sh.
* misc/Makefile (headers): Add sys/swap.h.
* posix/unistd.h: Remove decls for swapon, swapoff.
* sysdeps/generic/sys/swap.h: New file.
* sysdeps/unix/sysv/linux/sys/swap.h: New file.
* sysdeps/unix/sysv/linux/gnu/types.h: Remove temporary hack #define
of __kernel_fsid_t. It is correctly defines in <linux/types.h> now.
Tue Jun 11 23:23:30 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>
* Makerules (LDFLAGS-c.so): Use __libc_main instead of

21
Makeconfig
View File

@ -88,11 +88,12 @@ $(common-objpfx)config.make: $(common-objpfx)config.status $(..)config.h.in
# Find all the sysdeps configure fragments, to make sure we re-run
# configure when any of them changes.
sysdep-configures = $(foreach dir,$(config-sysdirs),\
$(patsubst %.in,%,\
$(firstword $(wildcard \
$(dir)/configure \
$(dir)/configure.in))))
sysdep-configures = \
$(foreach dir,$(config-sysdirs),\
$(patsubst %.in,%,\
$(firstword $(wildcard \
$(sysdep_dir)/$(dir)/configure \
$(sysdep_dir)/$(dir)/configure.in))))
# Force the user to configure before making.
$(common-objpfx)config.status: $(..)configure $(sysdep-configures)
@ -312,7 +313,7 @@ ifeq (yes,$(build-shared))
# We need the versioned name of libc.so in the deps of $(others) et al
# so that the symlink to libc.so is created before anything tries to
# run the linked programs.
link-libc = -Wl,-rpath-link=$(common-objdir):$(elfobjdir) \
link-libc = -Wl,-rpath-link=$(rpath-link) \
$(common-objpfx)libc.so$(libc.so-version) \
$(elfobjdir)/$(rtld-installed-name) \
$(common-objpfx)libc.a $(gnulib)
@ -323,6 +324,8 @@ default-rpath = $(slibdir):$(libdir)
else
default-rpath = $(libdir)
endif
# This is how to find at build-time things that will be installed there.
rpath-link = $(common-objdir):$(elfobjdir)
else
link-libc = $(common-objpfx)libc.a $(gnulib) $(common-objpfx)libc.a
endif
@ -356,9 +359,9 @@ built-program-cmd = $(built-program-file)
else
comma = ,
define built-program-cmd
LD_LIBRARY_PATH=$(common-objdir)$(patsubst -Wl$(comma)-rpath-link=%,:%,\
$(filter -Wl$(comma)-rpath-link=%,\
$(sysdep-LDFLAGS))) \
LD_LIBRARY_PATH=$(rpath-link)$(patsubst -Wl$(comma)-rpath-link=%,:%,\
$(filter -Wl$(comma)-rpath-link=%,\
$(sysdep-LDFLAGS))) \
$(elf-objpfx)ld.so $(built-program-file)
endef
endif

15
Makerules
View File

@ -420,10 +420,15 @@ endif
define o-iterator-doit
$(common-objpfx)$(patsubst %,$(libtype$o),c)($(ar-symtab-name)): \
$(common-objpfx)$(patsubst %,$(libtype$o),c)(\
$(patsubst $(objpfx)%,%,$(o-objects))) \
$(filter subdir_lib,$(firstword $(subdir) subdir_lib)); \
$(patsubst $(objpfx)%,%,$(o-objects))) $(subdirs-stamp-o); \
$$(RANLIB) $$(common-objpfx)$$(patsubst %,$$(libtype$o),c)
endef
ifndef subdir
subdirs-stamps := $(foreach d,$(subdirs),\
$(firstword $(objdir) $(subdir))/stamp%-$d)
subdirs-stamp-o = $(subst %,$o,$(subdirs-stamps))
$(subdirs-stamps): subdir_lib;
endif
object-suffixes-left = $(object-suffixes)
include $(o-iterator)
@ -810,8 +815,10 @@ define distinfo-vars
rm -f $@.new
$(foreach var,subdir subdir-dirs sources elided-routines sysdep_routines \
headers sysdep_headers distribute dont_distribute generated \
others tests extra-libs $(extra-libs:%=%-routines),
echo >> $@.new '$(var) := $($(var))')
others tests extra-libs $(extra-libs:%=%-routines) \
$(addprefix install-,lib data bin sbin others),
echo >> $@.new '$(subdir)-$(var) := $($(var))'
echo >> $@.new '$(var) = $$($(subdir)-$(var))')
endef
ifneq (,$(strip $(gpl2lgpl)))

2
elf/Makefile
View File

@ -26,7 +26,7 @@ routines = $(dl-routines) dl-open dl-close dl-symbol dl-support
# The core dynamic linking functions are in libc for the static and
# profiled libraries.
dl-routines = $(addprefix dl-,load lookup object reloc deps \
runtime error init fini)
runtime error init fini debug)
# But they are absent from the shared libc, because that code is in ld.so.
elide-routines.so = $(dl-routines) dl-support

8
elf/dl-close.c
View File

@ -41,6 +41,10 @@ _dl_close (struct link_map *map)
/* There are still references to this object. Do nothing more. */
return;
/* Notify the debugger we are about to remove some loaded objects. */
_r_debug.r_state = RT_DELETE;
_dl_debug_state ();
list = map->l_searchlist;
/* The search list contains a counted reference to each object it
@ -105,4 +109,8 @@ _dl_close (struct link_map *map)
}
free (list);
/* Notify the debugger those objects are finalized and gone. */
_r_debug.r_state = RT_CONSISTENT;
_dl_debug_state ();
}

56
elf/dl-debug.c Normal file
View File

@ -0,0 +1,56 @@
/* Communicate dynamic linker state to the debugger at runtime.
Copyright (C) 1996 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.
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, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <link.h>
/* This structure communicates dl state to the debugger. The debugger
normally finds it via the DT_DEBUG entry in the dynamic section, but in
a statically-linked program there is no dynamic section for the debugger
to examine and it looks for this particular symbol name. */
struct r_debug _r_debug;
/* Initialize _r_debug if it has not already been done. The argument is
the run-time load address of the dynamic linker, to be put in
_r_debug.r_ldbase. Returns the address of _r_debug. */
struct r_debug *
_dl_debug_initialize (ElfW(Addr) ldbase)
{
if (_r_debug.r_brk == 0)
{
/* Tell the debugger where to find the map of loaded objects. */
_r_debug.r_version = 1 /* R_DEBUG_VERSION XXX */;
_r_debug.r_ldbase = _dl_rtld_map.l_addr; /* Record our load address. */
_r_debug.r_map = _dl_loaded;
_r_debug.r_brk = (ElfW(Addr)) &_dl_debug_state;
}
return &_r_debug;
}
/* This function exists solely to have a breakpoint set on it by the
debugger. The debugger is supposed to find this function's address by
examining the r_brk member of struct r_debug, but GDB 4.15 in fact looks
for this particular symbol name in the PT_INTERP file. */
void
_dl_debug_state (void)
{
}

5
elf/dl-init.c
View File

@ -65,5 +65,10 @@ _dl_init_next (struct link_map *map)
l->l_init_called = 1;
}
/* Notify the debugger all new objects are now ready to go. */
_r_debug.r_state = RT_CONSISTENT;
_dl_debug_state ();
return 0;
}

3
elf/dl-lookup.c
View File

@ -129,7 +129,8 @@ _dl_lookup_symbol (const char *undef_name, const ElfW(Sym) **ref,
}
}
if (weak_value.s == NULL && ELFW(ST_BIND) ((*ref)->st_info) != STB_WEAK)
if (weak_value.s == NULL &&
!*ref || ELFW(ST_BIND) ((*ref)->st_info) != STB_WEAK)
{
/* We could find no value for a strong reference. */
const char msg[] = "undefined symbol: ";

15
elf/dl-open.c
View File

@ -29,6 +29,7 @@ _dl_open (struct link_map *parent, const char *file, int mode)
{
struct link_map *new, *l;
ElfW(Addr) init;
struct r_debug *r;
/* Load the named object. */
@ -47,7 +48,7 @@ _dl_open (struct link_map *parent, const char *file, int mode)
l = new;
while (l->l_next)
l = l->l_next;
do
while (1)
{
if (! l->l_relocated)
{
@ -56,8 +57,10 @@ _dl_open (struct link_map *parent, const char *file, int mode)
*_dl_global_scope_end = NULL;
}
if (l == new)
break;
l = l->l_prev;
} while (l != new);
}
new->l_global = (mode & RTLD_GLOBAL);
if (new->l_global)
@ -108,6 +111,14 @@ _dl_open (struct link_map *parent, const char *file, int mode)
}
}
/* Notify the debugger we have added some objects. We need to call
_dl_debug_initialize in a static program in case dynamic linking has
not been used before. */
r = _dl_debug_initialize (0);
r->r_state = RT_ADD;
_dl_debug_state ();
/* Run the initializer functions of new objects. */
while (init = _dl_init_next (new))
(*(void (*) (void)) init) ();

10
elf/link.h
View File

@ -62,6 +62,9 @@ struct r_debug
ElfW(Addr) r_ldbase; /* Base address the linker is loaded at. */
};
/* This is the instance of that structure used by the dynamic linker. */
extern struct r_debug _r_debug;
/* This symbol refers to the "dynamic structure" in the `.dynamic' section
of whatever module refers to `_DYNAMIC'. So, to find its own
`struct r_debug', a program could do:
@ -291,7 +294,12 @@ extern void _dl_fini (void);
any shared object mappings. The `r_state' member of `struct r_debug'
says what change is taking place. This function's address is
the value of the `r_brk' member. */
extern void _dl_r_debug_state (void);
extern void _dl_debug_state (void);
/* Initialize `struct r_debug' if it has not already been done. The
argument is the run-time load address of the dynamic linker, to be put
in the `r_ldbase' member. Returns the address of the structure. */
extern struct r_debug *_dl_debug_initialize (ElfW(Addr) ldbase);
#endif /* link.h */

34
elf/rtld.c
View File

@ -46,8 +46,6 @@ int _dl_argc;
char **_dl_argv;
const char *_dl_rpath;
struct r_debug _dl_r_debug;
static void dl_main (const ElfW(Phdr) *phdr,
ElfW(Half) phent,
ElfW(Addr) *user_entry);
@ -229,12 +227,6 @@ of this helper program; chances are you did not intend to run this program.\n",
/* Set up our cache of pointers into the hash table. */
_dl_setup_hash (l);
if (l->l_info[DT_DEBUG])
/* There is a DT_DEBUG entry in the dynamic section. Fill it in
with the run-time address of the r_debug structure, which we
will set up later to communicate with the debugger. */
l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) &_dl_r_debug;
/* Put the link_map for ourselves on the chain so it can be found by
name. */
_dl_rtld_map.l_name = (char *) _dl_rtld_map.l_libname = interpreter_name;
@ -343,11 +335,20 @@ of this helper program; chances are you did not intend to run this program.\n",
_dl_relocate_object (&_dl_rtld_map, &_dl_default_scope[2], 0);
}
/* Tell the debugger where to find the map of loaded objects. */
_dl_r_debug.r_version = 1 /* R_DEBUG_VERSION XXX */;
_dl_r_debug.r_ldbase = _dl_rtld_map.l_addr; /* Record our load address. */
_dl_r_debug.r_map = _dl_loaded;
_dl_r_debug.r_brk = (ElfW(Addr)) &_dl_r_debug_state;
{
/* Initialize _r_debug. */
struct r_debug *r = _dl_debug_initialize (_dl_rtld_map.l_addr);
l = _dl_loaded;
if (l->l_info[DT_DEBUG])
/* There is a DT_DEBUG entry in the dynamic section. Fill it in
with the run-time address of the r_debug structure */
l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
/* Notify the debugger that all objects are now mapped in. */
r->r_state = RT_ADD;
_dl_debug_state ();
}
if (_dl_rtld_map.l_info[DT_INIT])
{
@ -365,10 +366,3 @@ of this helper program; chances are you did not intend to run this program.\n",
/* Once we return, _dl_sysdep_start will invoke
the DT_INIT functions and then *USER_ENTRY. */
}
/* This function exists solely to have a breakpoint set on it by the
debugger. */
void
_dl_r_debug_state (void)
{
}

2
misc/Makefile
View File

@ -27,7 +27,7 @@ headers := sys/uio.h iovec.h sys/ioctl.h ioctls.h ioctl-types.h \
a.out.h nlist.h stab.h stab.def sgtty.h sys/dir.h sys/cdefs.h \
ttyent.h syslog.h sys/syslog.h paths.h sys/reboot.h \
sys/mman.h sys/param.h fstab.h mntent.h search.h err.h error.h\
sys/queue.h sysexits.h syscall.h sys/syscall.h
sys/queue.h sysexits.h syscall.h sys/syscall.h sys/swap.h
routines := brk sbrk sstk ioctl \
readv writev \

7
posix/unistd.h
View File

@ -662,13 +662,6 @@ extern int acct __P ((__const char *__name));
This call is restricted to the super-user. */
extern int chroot __P ((__const char *__path));
/* Make the block special device PATH available to the system for swapping.
This call is restricted to the super-user. */
extern int swapon __P ((__const char *__path));
/* Stop using block special device PATH for swapping. */
extern int swapoff __P ((__const char *__path));
/* Successive calls return the shells listed in `/etc/shells'. */
extern char *getusershell __P ((void));

33
sysdeps/generic/sys/swap.h Normal file
View File

@ -0,0 +1,33 @@
/* Calls to enable and disable swapping on specified locations. Unix version.
Copyright (C) 1996 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.
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, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef __SYS_SWAP_H
#define __SYS_SWAP_H 1
#include <features.h>
/* Make the block special device PATH available to the system for swapping.
This call is restricted to the super-user. */
extern int swapon __P ((__const char *__path));
/* Stop using block special device PATH for swapping. */
extern int swapoff __P ((__const char *__path));
#endif /* sys/swap.h */

1
sysdeps/unix/Dist
View File

@ -3,3 +3,4 @@ ioctls-tmpl.c ioctls.awk snarf-ioctls
make_errlist.c
mk-local_lim.c
s-proto.S
make-syscalls.sh

1
sysdeps/unix/sysv/linux/gnu/types.h
View File

@ -54,7 +54,6 @@ typedef __kernel_nlink_t __nlink_t; /* Type of file link counts. */
typedef __kernel_off_t __off_t; /* Type of file sizes and offsets. */
typedef __kernel_pid_t __pid_t; /* Type of process identifications. */
typedef __kernel_ssize_t __ssize_t; /* Type of a byte count, or error. */
#define __kernel_fsid_t long long /* XXX */
typedef __kernel_fsid_t __fsid_t; /* Type of file system IDs. */
/* Everythin' else. */

37
sysdeps/unix/sysv/linux/sys/swap.h Normal file
View File

@ -0,0 +1,37 @@
/* Calls to enable and disable swapping on specified locations. Linux version.
Copyright (C) 1996 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.
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, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef __SYS_SWAP_H
#define __SYS_SWAP_H 1
#include <features.h>
/* Get constants from kernel headers. */
#include <linux/swap.h>
/* Make the block special device PATH available to the system for swapping.
This call is restricted to the super-user. */
extern int swapon __P ((__const char *__path, int __flags));
/* Stop using block special device PATH for swapping. */
extern int swapoff __P ((__const char *__path));
#endif /* sys/swap.h */