diff options
Diffstat (limited to 'elf/rtld.c')
| -rw-r--r-- | elf/rtld.c | 32 |
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); } |