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authorUlrich Drepper <drepper@redhat.com>2002-08-21 23:01:40 +0000
committerUlrich Drepper <drepper@redhat.com>2002-08-21 23:01:40 +0000
commit01d8e36dd98d64d4d2b91bd01f83935ae6a21370 (patch)
treeea5cdc8fa0d9478db4a2f6b3cf7e6cab93aa8c15 /elf
parente40b90278660badb9386ebdcc000523dd92ff141 (diff)
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Update.
* elf/rtld.c (start_time): New global variable. Moved from _dl_start. (DONT_USE_BOOTSTRAP_MAP): Define if we can use non-exported symbols before relocation. (_dl_start): Don't use local bootstrap_map variable if DONT_USE_BOOTSTRAP_MAP is defined. Use GL(dl_rtld_map). Don't pass bootstrap_map to _dl_start_final in this case either. Don't pass start_time to _dl_start_final ever. (_dl_start_final): Don't copy bootstrap_map of DONT_USE_BOOTSTRAP_MAP. * elf/dl-deps.c (_dl_map_object_deps): Revert patch from 2002-05-28. This cripples the scope lists necessary to search for symbols in dependencies which are not in the global scope.
Diffstat (limited to 'elf')
-rw-r--r--elf/rtld.c58
1 files changed, 45 insertions, 13 deletions
diff --git a/elf/rtld.c b/elf/rtld.c
index f0f228f352..44fbf3e53a 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -115,6 +115,7 @@ static struct libname_list _dl_rtld_libname2;
static hp_timing_t rtld_total_time;
static hp_timing_t relocate_time;
static hp_timing_t load_time;
+static hp_timing_t start_time;
#endif
/* Additional definitions needed by TLS initialization. */
@@ -122,8 +123,22 @@ static hp_timing_t load_time;
TLS_INIT_HELPER
#endif
-static ElfW(Addr) _dl_start_final (void *arg, struct link_map *bootstrap_map_p,
- hp_timing_t start_time);
+/* Before ld.so is relocated we must not access variables which need
+ relocations. This means variables which are exported. Variables
+ declared as static are fine. If we can mark a variable hidden this
+ is fine, too. The latter is impotant here. We can avoid setting
+ up a temporary link map for ld.so if we can mark _rtld_global as
+ hidden. */
+#ifdef HAVE_HIDDEN
+# define DONT_USE_BOOTSTRAP_MAP 1
+#endif
+
+#ifdef DONT_USE_BOOTSTRAP_MAP
+static ElfW(Addr) _dl_start_final (void *arg);
+#else
+static ElfW(Addr) _dl_start_final (void *arg,
+ struct link_map *bootstrap_map_p);
+#endif
#ifdef RTLD_START
RTLD_START
@@ -134,8 +149,11 @@ RTLD_START
static ElfW(Addr) __attribute_used__ internal_function
_dl_start (void *arg)
{
+#ifdef DONT_USE_BOOTSTRAP_MAP
+# define bootstrap_map GL(dl_rtld_map)
+#else
struct link_map bootstrap_map;
- hp_timing_t start_time;
+#endif
#if !defined HAVE_BUILTIN_MEMSET || defined USE_TLS
size_t cnt;
#endif
@@ -160,14 +178,18 @@ _dl_start (void *arg)
/* Partly clean the `bootstrap_map' structure up. Don't use
`memset' since it might not be built in or inlined and we cannot
make function calls at this point. Use '__builtin_memset' if we
- know it is available. */
-#ifdef HAVE_BUILTIN_MEMSET
+ know it is available. We do not have to clear the memory if we
+ do not have to use the temporary bootstrap_map. Global variables
+ are initialized to zero by default. */
+#ifndef DONT_USE_BOOTSTRAP_MAP
+# ifdef HAVE_BUILTIN_MEMSET
__builtin_memset (bootstrap_map.l_info, '\0', sizeof (bootstrap_map.l_info));
-#else
+# else
for (cnt = 0;
cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]);
++cnt)
bootstrap_map.l_info[cnt] = 0;
+# endif
#endif
/* Figure out the run-time load address of the dynamic linker itself. */
@@ -178,7 +200,7 @@ _dl_start (void *arg)
elf_get_dynamic_info (&bootstrap_map);
#if USE_TLS
-# ifndef HAVE___THREAD
+# if !defined HAVE___THREAD && !defined DONT_USE_BOOTSTRAP_MAP
/* Signal that we have not found TLS data so far. */
bootstrap_map.l_tls_modid = 0;
# endif
@@ -306,7 +328,11 @@ _dl_start (void *arg)
function, that way the compiler cannot put accesses to the GOT
before ELF_DYNAMIC_RELOCATE. */
{
- ElfW(Addr) entry = _dl_start_final (arg, &bootstrap_map, start_time);
+#ifdef DONT_USE_BOOTSTRAP_MAP
+ ElfW(Addr) entry = _dl_start_final (arg);
+#else
+ ElfW(Addr) entry = _dl_start_final (arg, &bootstrap_map);
+#endif
#ifndef ELF_MACHINE_START_ADDRESS
# define ELF_MACHINE_START_ADDRESS(map, start) (start)
@@ -326,9 +352,13 @@ _dl_start (void *arg)
+ DT_EXTRANUM + DT_VALNUM + DT_ADDRTAGIDX (tag))
#endif
+#ifdef DONT_USE_BOOTSTRAP_MAP
+static ElfW(Addr)
+_dl_start_final (void *arg)
+#else
static ElfW(Addr)
-_dl_start_final (void *arg, struct link_map *bootstrap_map_p,
- hp_timing_t start_time)
+_dl_start_final (void *arg, struct link_map *bootstrap_map_p)
+#endif
{
/* The use of `alloca' here looks ridiculous but it helps. The goal
is to avoid the function from being inlined. There is no official
@@ -349,17 +379,19 @@ _dl_start_final (void *arg, struct link_map *bootstrap_map_p,
}
/* Transfer data about ourselves to the permanent link_map structure. */
+#ifndef DONT_USE_BOOTSTRAP_MAP
GL(dl_rtld_map).l_addr = bootstrap_map_p->l_addr;
GL(dl_rtld_map).l_ld = bootstrap_map_p->l_ld;
- GL(dl_rtld_map).l_opencount = 1;
memcpy (GL(dl_rtld_map).l_info, bootstrap_map_p->l_info,
sizeof GL(dl_rtld_map).l_info);
- _dl_setup_hash (&GL(dl_rtld_map));
GL(dl_rtld_map).l_mach = bootstrap_map_p->l_mach;
+#endif
+ _dl_setup_hash (&GL(dl_rtld_map));
+ GL(dl_rtld_map).l_opencount = 1;
GL(dl_rtld_map).l_map_start = (ElfW(Addr)) _begin;
GL(dl_rtld_map).l_map_end = (ElfW(Addr)) _end;
/* Copy the TLS related data if necessary. */
-#if USE_TLS
+#if USE_TLS && !defined DONT_USE_BOOTSTRAP_MAP
# ifdef HAVE___THREAD
assert (bootstrap_map_p->l_tls_modid != 0);
# else