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-rw-r--r--elf/Makefile2
-rw-r--r--elf/dl-open.c24
-rw-r--r--elf/dl-profstub.c43
-rw-r--r--elf/dl-support.c1
-rw-r--r--elf/dlfcn.h30
-rw-r--r--elf/ldsodefs.h19
-rw-r--r--elf/rtld.c1
7 files changed, 113 insertions, 7 deletions
diff --git a/elf/Makefile b/elf/Makefile
index b2ea241808..dedc3d5074 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -22,7 +22,7 @@ subdir := elf
headers = elf.h bits/elfclass.h bits/dlfcn.h link.h dlfcn.h
routines = $(dl-routines) dl-open dl-close dl-symbol dl-support \
- dl-addr enbl-secure
+ dl-addr enbl-secure dl-profstub
# The core dynamic linking functions are in libc for the static and
# profiled libraries.
diff --git a/elf/dl-open.c b/elf/dl-open.c
index 4c4c8abdc5..2b9590913f 100644
--- a/elf/dl-open.c
+++ b/elf/dl-open.c
@@ -101,9 +101,27 @@ _dl_open (const char *file, int mode)
magic ward. */
asm ("" : "=r" (reloc) : "0" (reloc));
- (*reloc) (l, _dl_object_relocation_scope (l),
- ((mode & RTLD_BINDING_MASK) == RTLD_LAZY
- || _dl_profile != NULL), _dl_profile != NULL);
+#ifdef PIC
+ if (_dl_profile != NULL)
+ {
+ /* If this here is the shared object which we want to profile
+ make sure the profile is started. We can find out whether
+ this is necessary or not by observing the `_dl_profile_map'
+ variable. If was NULL but is not NULL afterwars we must
+ start the profiling. */
+ struct link_map *old_profile_map = _dl_profile_map;
+
+ (*reloc) (l, _dl_object_relocation_scope (l), 1, 1);
+
+ if (old_profile_map == NULL && _dl_profile_map != NULL)
+ /* We must prepare the profiling. */
+ _dl_start_profile (_dl_profile_map, _dl_profile_output);
+ }
+ else
+#endif
+ (*reloc) (l, _dl_object_relocation_scope (l),
+ (mode & RTLD_BINDING_MASK) == RTLD_LAZY, 0);
+
*_dl_global_scope_end = NULL;
}
diff --git a/elf/dl-profstub.c b/elf/dl-profstub.c
new file mode 100644
index 0000000000..9740c6adc4
--- /dev/null
+++ b/elf/dl-profstub.c
@@ -0,0 +1,43 @@
+/* Helper definitions for profiling of shared libraries.
+ Copyright (C) 1998 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+ 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. */
+
+#include <dlfcn.h>
+#include <elf.h>
+#include <elf/ldsodefs.h>
+
+/* This is the map for the shared object we profile. It is defined here
+ only because we test for this value being NULL or not. */
+struct link_map *_dl_profile_map;
+
+
+void
+_dl_mcount_wrapper (ElfW(Addr) selfpc)
+{
+ _dl_mcount ((ElfW(Addr)) __builtin_return_address (0), selfpc);
+}
+
+
+void
+_dl_mcount_wrapper_check (void *selfpc)
+{
+ if (_dl_profile_map != NULL)
+ _dl_mcount ((ElfW(Addr)) __builtin_return_address (0),
+ (ElfW(Addr)) selfpc);
+}
diff --git a/elf/dl-support.c b/elf/dl-support.c
index 85f656c2fd..73c90c2f42 100644
--- a/elf/dl-support.c
+++ b/elf/dl-support.c
@@ -53,7 +53,6 @@ struct r_search_path *_dl_search_paths;
/* We never do profiling. */
const char *_dl_profile;
-struct link_map *_dl_profile_map;
/* Names of shared object for which the RPATHs should be ignored. */
const char *_dl_inhibit_rpath;
diff --git a/elf/dlfcn.h b/elf/dlfcn.h
index 825b4843c1..e0b17d392a 100644
--- a/elf/dlfcn.h
+++ b/elf/dlfcn.h
@@ -1,5 +1,5 @@
/* User functions for run-time dynamic loading.
- Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
+ Copyright (C) 1995, 1996, 1997, 1998 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
@@ -70,6 +70,34 @@ typedef struct
} Dl_info;
extern int dladdr __P ((const void *__address, Dl_info *__info));
+#ifdef __USE_GNU
+/* To support profiling of shared objects it is a good idea to call
+ the function found using `dlsym' using the following macro since
+ these calls do not use the PLT. But this would mean the dynamic
+ loader has no chance to find out when the function is called. The
+ macro applies the necessary magic so that profiling is possible.
+ Rewrite
+ foo = (*fctp) (arg1, arg2);
+ into
+ foo = DL_CALL_FCT (fctp, (arg1, arg2));
+*/
+# if __GNUC__ >= 2
+/* Do not ever use this variable directly, it is internal! */
+extern struct link_map *_dl_profile_map;
+
+# define DL_CALL_FCT(fctp, args) \
+ (__extension__ ({ if (_dl_profile_map != NULL) \
+ _dl_mcount_wrapper_check (fctp); \
+ (*fctp) args; })
+# else
+/* This feature is not available without GCC. */
+# define DL_CALL_FCT(fctp, args) (*fctp) args
+# endif
+
+/* This function calls the profiling functions. */
+extern void _dl_mcount_wrapper_check __P ((void *__selfpc));
+#endif
+
__END_DECLS
#endif /* dlfcn.h */
diff --git a/elf/ldsodefs.h b/elf/ldsodefs.h
index 45c2a5ec64..6814f25556 100644
--- a/elf/ldsodefs.h
+++ b/elf/ldsodefs.h
@@ -127,6 +127,8 @@ extern int _dl_zerofd;
extern const char *_dl_profile;
/* Map of shared object to be profiled. */
extern struct link_map *_dl_profile_map;
+/* Filename of the output file. */
+extern const char *_dl_profile_output;
/* If nonzero the appropriate debug information is printed. */
extern int _dl_debug_libs;
@@ -409,6 +411,11 @@ extern void _dl_start_profile (struct link_map *map, const char *output_dir)
/* The actual functions used to keep book on the calls. */
extern void _dl_mcount (ElfW(Addr) frompc, ElfW(Addr) selfpc);
+/* This function is simply a wrapper around the _dl_mcount function
+ which does not require a FROMPC parameter since this is the
+ calling function. */
+extern void _dl_mcount_wrapper (ElfW(Addr) selfpc);
+
/* Show the members of the auxiliary array passed up from the kernel. */
extern void _dl_show_auxv (void) internal_function;
@@ -424,6 +431,18 @@ extern const struct r_strlenpair *_dl_important_hwcaps (const char *platform,
size_t *max_capstrlen)
internal_function;
+
+/* When we do profiling we have the problem that uses of `dlopen'ed
+ objects don't use the PLT but instead use a pointer to the function.
+ We still want to have profiling data and in these cases we must do
+ the work of calling `_dl_mcount' ourself. The following macros
+ helps do it. */
+#define _CALL_DL_FCT(fctp, args) \
+ ({ if (_dl_profile_map != NULL) \
+ _dl_mcount_wrapper ((ElfW(Addr)) fctp); \
+ (*fctp) args; \
+ })
+
__END_DECLS
#endif /* ldsodefs.h */
diff --git a/elf/rtld.c b/elf/rtld.c
index 028467f6f8..5bd4b7cd97 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -73,7 +73,6 @@ unsigned long _dl_hwcap;
struct r_search_path *_dl_search_paths;
const char *_dl_profile;
const char *_dl_profile_output;
-struct link_map *_dl_profile_map;
int _dl_debug_libs;
int _dl_debug_impcalls;
int _dl_debug_bindings;