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authorUlrich Drepper <drepper@redhat.com>1998-06-18 16:51:12 +0000
committerUlrich Drepper <drepper@redhat.com>1998-06-18 16:51:12 +0000
commit5ad49c070734c57f35cfe045572fb22158870c78 (patch)
treed17a62167c0996bbe744522fcb819446817cdc04 /elf/dlfcn.h
parent2827300fbe8b237b825aa29b95f24026aedd4b20 (diff)
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Update.
1998-06-18 16:40 Ulrich Drepper <drepper@cygnus.com> * libc.map: Add _dl_profile_map, _dl_profile_output, _dl_start_profile, _dl_mcount, _dl_mcount_wrapper. * elf/Makefile (routines): Add dl-profstub. * elf/dl-profstub.c: New file. * elf/dl-support.c: Don't define _dl_profile_map. * elf/rtld.c: Likewise. * elf/dlfcn.h: Define DL_CALL_FCT macro. * elf/ldsodefs.h: Declare _dl_profile_output, _dl_mcount_wrapper. Define _CALL_DL_FCT. * iconv/gconv.c: Use _CALL_DL_FCT to call function from dynamically loaded object. * iconv/gconv_db.c: Likewise. * iconv/skeleton.c: Likewise. * nss/getXXbyYY_r.c: Likewise. * nss/getXXent_r.c: Likewise. * nss/nsswitch.c: Likewise.
Diffstat (limited to 'elf/dlfcn.h')
-rw-r--r--elf/dlfcn.h30
1 files changed, 29 insertions, 1 deletions
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 */