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-rw-r--r--elf/rtld.c32
1 files changed, 31 insertions, 1 deletions
diff --git a/elf/rtld.c b/elf/rtld.c
index 7189ca6b2b..726463c882 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -61,6 +61,9 @@ int _dl_verbose;
const char *_dl_platform;
size_t _dl_platformlen;
struct r_search_path *_dl_search_paths;
+const char *_dl_profile;
+const char *_dl_profile_output;
+struct link_map *_dl_profile_map;
/* Set nonzero during loading and initialization of executable and
libraries, cleared before the executable's entry point runs. This
@@ -109,7 +112,7 @@ _dl_start (void *arg)
/* Relocate ourselves so we can do normal function calls and
data access using the global offset table. */
- ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0);
+ ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0);
/* Now life is sane; we can call functions and access global data.
Set up to use the operating system facilities, and find out from
@@ -269,6 +272,26 @@ dl_main (const ElfW(Phdr) *phdr,
else
lazy = !__libc_enable_secure && *(getenv ("LD_BIND_NOW") ?: "") == '\0';
+ /* See whether we want to use profiling. */
+ _dl_profile = getenv ("LD_PROFILE");
+ if (_dl_profile != NULL)
+ if (_dl_profile[0] == '\0')
+ /* An empty string is of not much help. Disable profiling. */
+ _dl_profile = NULL;
+ else
+ {
+ /* OK, we have the name of a shared object we want to
+ profile. It's up to the user to provide a good name, it
+ must match the file name or soname of one of the loaded
+ objects. Now let's see where we are supposed to place the
+ result. */
+ _dl_profile_output = getenv ("LD_PROFILE_OUTPUT");
+
+ if (_dl_profile_output == NULL || _dl_profile_output[0] == '\0')
+ /* This is the default place. */
+ _dl_profile_output = "/var/tmp";
+ }
+
/* Set up a flag which tells we are just starting. */
_dl_starting_up = 1;
@@ -814,6 +837,11 @@ of this helper program; chances are you did not intend to run this program.\n",
_dl_debug_state ();
}
+ /* Now enable profiling if needed. */
+ if (_dl_profile_map != NULL)
+ /* We must prepare the profiling. */
+ _dl_start_profile (_dl_profile_map, _dl_profile_output);
+
/* Once we return, _dl_sysdep_start will invoke
the DT_INIT functions and then *USER_ENTRY. */
}
@@ -824,6 +852,8 @@ static void
print_unresolved (int errcode __attribute__ ((unused)), const char *objname,
const char *errstring)
{
+ if (objname[0] == '\0')
+ objname = _dl_argv[0] ?: "<main program>";
_dl_sysdep_error (errstring, " (", objname, ")\n", NULL);
}