/* Run time dynamic linker.
-Copyright (C) 1995 Free Software Foundation, Inc.
+Copyright (C) 1995, 1996 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
Cambridge, MA 02139, USA. */
#include <link.h>
-#include "dynamic-link.h"
#include <stddef.h>
#include <stdlib.h>
+#include <string.h>
#include <unistd.h>
+#include <sys/mman.h> /* Check if MAP_ANON is defined. */
+#include "../stdio-common/_itoa.h"
+#include <assert.h>
+#include "dynamic-link.h"
-#ifdef RTLD_START
-RTLD_START
-#else
-#error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START"
-#endif
-
/* System-specific function to do initial startup for the dynamic linker.
After this, file access calls and getenv must work. This is responsible
- for setting _dl_secure if we need to be secure (e.g. setuid),
+ for setting __libc_enable_secure if we need to be secure (e.g. setuid),
and for setting _dl_argc and _dl_argv, and then calling _dl_main. */
-extern Elf32_Addr _dl_sysdep_start (void **start_argptr,
- void (*dl_main) (const Elf32_Phdr *phdr,
- Elf32_Word phent,
- Elf32_Addr *user_entry));
+extern ElfW(Addr) _dl_sysdep_start (void **start_argptr,
+ void (*dl_main) (const ElfW(Phdr) *phdr,
+ ElfW(Half) phent,
+ ElfW(Addr) *user_entry));
+extern void _dl_sysdep_start_cleanup (void);
-int _dl_secure;
int _dl_argc;
char **_dl_argv;
+const char *_dl_rpath;
+
+/* Set nonzero during loading and initialization of executable and
+ libraries, cleared before the executable's entry point runs. This
+ must not be initialized to nonzero, because the unused dynamic
+ linker loaded in for libc.so's "ld.so.1" dep will provide the
+ definition seen by libc.so's initializer; that value must be zero,
+ and will be since that dynamic linker's _dl_start and dl_main will
+ never be called. */
+int _dl_starting_up;
-struct r_debug dl_r_debug;
+static void dl_main (const ElfW(Phdr) *phdr,
+ ElfW(Half) phent,
+ ElfW(Addr) *user_entry);
-static void dl_main (const Elf32_Phdr *phdr,
- Elf32_Word phent,
- Elf32_Addr *user_entry);
+struct link_map _dl_rtld_map;
+
+#ifdef RTLD_START
+RTLD_START
+#else
+#error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START"
+#endif
-Elf32_Addr
+ElfW(Addr)
_dl_start (void *arg)
{
- struct link_map rtld_map;
+ struct link_map bootstrap_map;
+
+ /* This #define produces dynamic linking inline functions for
+ bootstrap relocation instead of general-purpose relocation. */
+#define RTLD_BOOTSTRAP
+#define RESOLVE(sym, flags) bootstrap_map.l_addr
+#include "dynamic-link.h"
/* Figure out the run-time load address of the dynamic linker itself. */
- rtld_map.l_addr = elf_machine_load_address ();
+ bootstrap_map.l_addr = elf_machine_load_address ();
/* Read our own dynamic section and fill in the info array.
Conveniently, the first element of the GOT contains the
offset of _DYNAMIC relative to the run-time load address. */
- rtld_map.l_ld = (void *) rtld_map.l_addr + *elf_machine_got ();
- elf_get_dynamic_info (rtld_map.l_ld, rtld_map.l_info);
+ bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + *elf_machine_got ();
+ elf_get_dynamic_info (bootstrap_map.l_ld, bootstrap_map.l_info);
#ifdef ELF_MACHINE_BEFORE_RTLD_RELOC
- ELF_MACHINE_BEFORE_RTLD_RELOC (rtld_map.l_info);
+ ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info);
#endif
/* Relocate ourselves so we can do normal function calls and
data access using the global offset table. */
- /* We must initialize `l_type' to make sure it is not `lt_interpreter'.
- That is the type to describe us, but not during bootstrapping--it
- indicates to elf_machine_rel{,a} that we were already relocated during
- bootstrapping, so it must anti-perform each bootstrapping relocation
- before applying the final relocation when ld.so is linked in as
- normal a shared library. */
- rtld_map.l_type = lt_library;
- ELF_DYNAMIC_RELOCATE (&rtld_map, 0, NULL);
+ ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0);
/* Now life is sane; we can call functions and access global data.
the operating system's program loader where to find the program
header table in core. */
- dl_r_debug.r_ldbase = rtld_map.l_addr; /* Record our load address. */
+
+ /* Transfer data about ourselves to the permanent link_map structure. */
+ _dl_rtld_map.l_addr = bootstrap_map.l_addr;
+ _dl_rtld_map.l_ld = bootstrap_map.l_ld;
+ memcpy (_dl_rtld_map.l_info, bootstrap_map.l_info,
+ sizeof _dl_rtld_map.l_info);
+ _dl_setup_hash (&_dl_rtld_map);
+
+ /* Cache the DT_RPATH stored in ld.so itself; this will be
+ the default search path. */
+ _dl_rpath = (void *) (_dl_rtld_map.l_addr +
+ _dl_rtld_map.l_info[DT_STRTAB]->d_un.d_ptr +
+ _dl_rtld_map.l_info[DT_RPATH]->d_un.d_val);
/* Call the OS-dependent function to set up life so we can do things like
file access. It will call `dl_main' (below) to do all the real work
of the dynamic linker, and then unwind our frame and run the user
entry point on the same stack we entered on. */
- return _dl_sysdep_start (&arg, &dl_main);
+ return _dl_sysdep_start (arg, &dl_main);
}
void _start (void);
-static int rtld_command; /* Nonzero if we were run directly. */
+unsigned int _dl_skip_args; /* Nonzero if we were run directly. */
static void
-dl_main (const Elf32_Phdr *phdr,
- Elf32_Word phent,
- Elf32_Addr *user_entry)
+dl_main (const ElfW(Phdr) *phdr,
+ ElfW(Half) phent,
+ ElfW(Addr) *user_entry)
{
- void doit (void)
- {
- const Elf32_Phdr *ph;
- struct link_map *l;
- const char *interpreter_name;
- int lazy;
+ const ElfW(Phdr) *ph;
+ struct link_map *l;
+ int lazy;
+ enum { normal, list, verify, trace } mode;
+ struct link_map **preloads;
+ unsigned int npreloads;
- if (*user_entry == (Elf32_Addr) &_start)
- {
- /* Ho ho. We are not the program interpreter! We are the program
- itself! This means someone ran ld.so as a command. Well, that
- might be convenient to do sometimes. We support it by
- interpreting the args like this:
-
- ld.so PROGRAM ARGS...
-
- The first argument is the name of a file containing an ELF
- executable we will load and run with the following arguments.
- To simplify life here, PROGRAM is searched for using the
- normal rules for shared objects, rather than $PATH or anything
- like that. We just load it and use its entry point; we don't
- pay attention to its PT_INTERP command (we are the interpreter
- ourselves). This is an easy way to test a new ld.so before
- installing it. */
- if (_dl_argc < 2)
- _dl_sysdep_fatal ("\
-Usage: ld.so EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\
+ mode = getenv ("LD_TRACE_LOADED_OBJECTS") != NULL ? trace : normal;
+
+ if (*user_entry == (ElfW(Addr)) &_start)
+ {
+ /* Ho ho. We are not the program interpreter! We are the program
+ itself! This means someone ran ld.so as a command. Well, that
+ might be convenient to do sometimes. We support it by
+ interpreting the args like this:
+
+ ld.so PROGRAM ARGS...
+
+ The first argument is the name of a file containing an ELF
+ executable we will load and run with the following arguments.
+ To simplify life here, PROGRAM is searched for using the
+ normal rules for shared objects, rather than $PATH or anything
+ like that. We just load it and use its entry point; we don't
+ pay attention to its PT_INTERP command (we are the interpreter
+ ourselves). This is an easy way to test a new ld.so before
+ installing it. */
+ if (_dl_argc < 2)
+ _dl_sysdep_fatal ("\
+Usage: ld.so [--list|--verify] EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\
You have invoked `ld.so', the helper program for shared library executables.\n\
This program usually lives in the file `/lib/ld.so', and special directives\n\
in executable files using ELF shared libraries tell the system's program\n\
specified, instead of the helper program file specified in the executable\n\
file you run. This is mostly of use for maintainers to test new versions\n\
of this helper program; chances are you did not intend to run this program.\n",
- NULL);
+ NULL);
+
+ /* Note the place where the dynamic linker actually came from. */
+ _dl_rtld_map.l_name = _dl_argv[0];
- rtld_command = 1;
- interpreter_name = _dl_argv[0];
+ if (! strcmp (_dl_argv[1], "--list"))
+ {
+ mode = list;
+
+ ++_dl_skip_args;
--_dl_argc;
++_dl_argv;
- l = _dl_map_object (NULL, _dl_argv[0], user_entry);
- phdr = l->l_phdr;
- phent = l->l_phnum;
- l->l_type = lt_executable;
- l->l_libname = (char *) "";
}
- else
+ else if (! strcmp (_dl_argv[1], "--verify"))
{
- /* Create a link_map for the executable itself.
- This will be what dlopen on "" returns. */
- l = _dl_new_object ((char *) "", "", lt_executable);
- l->l_phdr = phdr;
- l->l_phnum = phent;
- interpreter_name = 0;
+ mode = verify;
+
+ ++_dl_skip_args;
+ --_dl_argc;
+ ++_dl_argv;
}
- /* Scan the program header table for the dynamic section. */
- for (ph = phdr; ph < &phdr[phent]; ++ph)
- switch (ph->p_type)
- {
- case PT_DYNAMIC:
- /* This tells us where to find the dynamic section,
- which tells us everything we need to do. */
- l->l_ld = (void *) l->l_addr + ph->p_vaddr;
- break;
- case PT_INTERP:
- /* This "interpreter segment" was used by the program loader to
- find the program interpreter, which is this program itself, the
- dynamic linker. We note what name finds us, so that a future
- dlopen call or DT_NEEDED entry, for something that wants to link
- against the dynamic linker as a shared library, will know that
- the shared object is already loaded. */
- interpreter_name = (void *) l->l_addr + ph->p_vaddr;
- break;
- }
- assert (interpreter_name); /* How else did we get here? */
-
- /* Extract the contents of the dynamic section for easy access. */
- elf_get_dynamic_info (l->l_ld, l->l_info);
- /* Set up our cache of pointers into the hash table. */
- _dl_setup_hash (l);
-
- if (l->l_info[DT_DEBUG])
- /* There is a DT_DEBUG entry in the dynamic section. Fill it in
- with the run-time address of the r_debug structure, which we
- will set up later to communicate with the debugger. */
- l->l_info[DT_DEBUG]->d_un.d_ptr = (Elf32_Addr) &dl_r_debug;
-
- l = _dl_new_object ((char *) interpreter_name, interpreter_name,
- lt_interpreter);
-
- /* Now process all the DT_NEEDED entries and map in the objects.
- Each new link_map will go on the end of the chain, so we will
- come across it later in the loop to map in its dependencies. */
- for (l = _dl_loaded; l; l = l->l_next)
+ ++_dl_skip_args;
+ --_dl_argc;
+ ++_dl_argv;
+
+ if (mode == verify)
{
- if (l->l_info[DT_NEEDED])
+ void doit (void)
+ {
+ l = _dl_map_object (NULL, _dl_argv[0], lt_library);
+ }
+ char *err_str = NULL;
+ const char *obj_name __attribute__ ((unused));
+
+ (void) _dl_catch_error (&err_str, &obj_name, doit);
+ if (err_str != NULL)
{
- const char *strtab
- = (void *) l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr;
- const Elf32_Dyn *d;
- for (d = l->l_ld; d->d_tag != DT_NULL; ++d)
- if (d->d_tag == DT_NEEDED)
- _dl_map_object (l, strtab + d->d_un.d_val, NULL);
+ free (err_str);
+ _exit (EXIT_FAILURE);
}
- l->l_deps_loaded = 1;
}
+ else
+ l = _dl_map_object (NULL, _dl_argv[0], lt_library);
+
+ phdr = l->l_phdr;
+ phent = l->l_phnum;
+ l->l_name = (char *) "";
+ *user_entry = l->l_entry;
+ }
+ else
+ {
+ /* Create a link_map for the executable itself.
+ This will be what dlopen on "" returns. */
+ l = _dl_new_object ((char *) "", "", lt_executable);
+ l->l_phdr = phdr;
+ l->l_phnum = phent;
+ l->l_entry = *user_entry;
+ }
- l = _dl_loaded->l_next;
- assert (l->l_type == lt_interpreter);
- if (l->l_opencount == 0)
+ if (l != _dl_loaded)
+ {
+ /* GDB assumes that the first element on the chain is the
+ link_map for the executable itself, and always skips it.
+ Make sure the first one is indeed that one. */
+ l->l_prev->l_next = l->l_next;
+ if (l->l_next)
+ l->l_next->l_prev = l->l_prev;
+ l->l_prev = NULL;
+ l->l_next = _dl_loaded;
+ _dl_loaded->l_prev = l;
+ _dl_loaded = l;
+ }
+
+ /* Scan the program header table for the dynamic section. */
+ for (ph = phdr; ph < &phdr[phent]; ++ph)
+ switch (ph->p_type)
+ {
+ case PT_DYNAMIC:
+ /* This tells us where to find the dynamic section,
+ which tells us everything we need to do. */
+ l->l_ld = (void *) l->l_addr + ph->p_vaddr;
+ break;
+ case PT_INTERP:
+ /* This "interpreter segment" was used by the program loader to
+ find the program interpreter, which is this program itself, the
+ dynamic linker. We note what name finds us, so that a future
+ dlopen call or DT_NEEDED entry, for something that wants to link
+ against the dynamic linker as a shared library, will know that
+ the shared object is already loaded. */
+ _dl_rtld_map.l_libname = (const char *) l->l_addr + ph->p_vaddr;
+ break;
+ }
+ if (! _dl_rtld_map.l_libname && _dl_rtld_map.l_name)
+ /* We were invoked directly, so the program might not have a PT_INTERP. */
+ _dl_rtld_map.l_libname = _dl_rtld_map.l_name;
+ else
+ assert (_dl_rtld_map.l_libname); /* How else did we get here? */
+
+ if (mode == verify)
+ /* We were called just to verify that this is a dynamic executable
+ using us as the program interpreter. */
+ _exit ((strcmp (_dl_rtld_map.l_libname, _dl_rtld_map.l_name) ||
+ l->l_ld == NULL)
+ ? EXIT_FAILURE : EXIT_SUCCESS);
+
+ /* Extract the contents of the dynamic section for easy access. */
+ elf_get_dynamic_info (l->l_ld, l->l_info);
+ if (l->l_info[DT_HASH])
+ /* Set up our cache of pointers into the hash table. */
+ _dl_setup_hash (l);
+
+ /* Put the link_map for ourselves on the chain so it can be found by
+ name. */
+ if (! _dl_rtld_map.l_name)
+ /* If not invoked directly, the dynamic linker shared object file was
+ found by the PT_INTERP name. */
+ _dl_rtld_map.l_name = (char *) _dl_rtld_map.l_libname;
+ _dl_rtld_map.l_type = lt_library;
+ while (l->l_next)
+ l = l->l_next;
+ l->l_next = &_dl_rtld_map;
+ _dl_rtld_map.l_prev = l;
+
+ preloads = NULL;
+ npreloads = 0;
+ if (! __libc_enable_secure)
+ {
+ const char *preloadlist = getenv ("LD_PRELOAD");
+ if (preloadlist)
{
- /* No DT_NEEDED entry referred to the interpreter object itself.
- Remove it from the maps we will use for symbol resolution. */
- l->l_prev->l_next = l->l_next;
- if (l->l_next)
- l->l_next->l_prev = l->l_prev;
+ /* The LD_PRELOAD environment variable gives a colon-separated
+ list of libraries that are loaded before the executable's
+ dependencies and prepended to the global scope list. */
+ char *list = strdupa (preloadlist);
+ char *p;
+ while ((p = strsep (&list, ":")) != NULL)
+ {
+ (void) _dl_map_object (NULL, p, lt_library);
+ ++npreloads;
+ }
+
+ if (npreloads != 0)
+ {
+ /* Set up PRELOADS with a vector of the preloaded libraries. */
+ struct link_map *l;
+ unsigned int i;
+ preloads = __alloca (npreloads * sizeof preloads[0]);
+ l = _dl_rtld_map.l_next; /* End of the chain before preloads. */
+ i = 0;
+ do
+ {
+ preloads[i++] = l;
+ l = l->l_next;
+ } while (l);
+ assert (i == npreloads);
+ }
}
+ }
+
+ /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD
+ specified some libraries to load, these are inserted before the actual
+ dependencies in the executable's searchlist for symbol resolution. */
+ _dl_map_object_deps (l, preloads, npreloads);
+
+#ifndef MAP_ANON
+ /* We are done mapping things, so close the zero-fill descriptor. */
+ __close (_dl_zerofd);
+ _dl_zerofd = -1;
+#endif
- lazy = !_dl_secure && *(getenv ("LD_BIND_NOW") ?: "") == '\0';
+ /* Remove _dl_rtld_map from the chain. */
+ _dl_rtld_map.l_prev->l_next = _dl_rtld_map.l_next;
+ if (_dl_rtld_map.l_next)
+ _dl_rtld_map.l_next->l_prev = _dl_rtld_map.l_prev;
- /* Now we have all the objects loaded. Relocate them all.
- We do this in reverse order so that copy relocs of earlier
- objects overwrite the data written by later objects. */
- l = _dl_loaded;
- while (l->l_next)
- l = l->l_next;
- do
+ if (_dl_rtld_map.l_opencount)
+ {
+ /* Some DT_NEEDED entry referred to the interpreter object itself, so
+ put it back in the list of visible objects. We insert it into the
+ chain in symbol search order because gdb uses the chain's order as
+ its symbol search order. */
+ unsigned int i = 1;
+ while (l->l_searchlist[i] != &_dl_rtld_map)
+ ++i;
+ _dl_rtld_map.l_prev = l->l_searchlist[i - 1];
+ _dl_rtld_map.l_next = (i + 1 < l->l_nsearchlist ?
+ l->l_searchlist[i + 1] : NULL);
+ assert (_dl_rtld_map.l_prev->l_next == _dl_rtld_map.l_next);
+ _dl_rtld_map.l_prev->l_next = &_dl_rtld_map;
+ if (_dl_rtld_map.l_next)
{
- _dl_relocate_object (l, lazy);
- l = l->l_prev;
- } while (l);
-
- /* Tell the debugger where to find the map of loaded objects. */
- dl_r_debug.r_version = 1 /* R_DEBUG_VERSION XXX */;
- dl_r_debug.r_map = _dl_loaded;
- dl_r_debug.r_brk = (Elf32_Addr) &_dl_r_debug_state;
+ assert (_dl_rtld_map.l_next->l_prev == _dl_rtld_map.l_prev);
+ _dl_rtld_map.l_next->l_prev = &_dl_rtld_map;
+ }
}
- const char *errstring;
- const char *errobj;
- int err;
-
- err = _dl_catch_error (&errstring, &errobj, &doit);
- if (errstring)
- _dl_sysdep_fatal (_dl_argv[0] ?: "<program name unknown>",
- ": error in loading shared libraries\n",
- errobj ?: "", errobj ? ": " : "",
- errstring, err ? ": " : NULL,
- err ? strerror (err) : NULL, NULL);
- /* Once we return, _dl_sysdep_start will invoke
- the DT_INIT functions and then *USER_ENTRY. */
-}
+ if (mode != normal)
+ {
+ /* We were run just to list the shared libraries. It is
+ important that we do this before real relocation, because the
+ functions we call below for output may no longer work properly
+ after relocation. */
-/* This function exists solely to have a breakpoint set on it by the
- debugger. */
-void
-_dl_r_debug_state (void)
-{
-}
-\f
-#ifndef NDEBUG
+ int i;
-/* Define (weakly) our own assert failure function which doesn't use stdio.
- If we are linked into the user program (-ldl), the normal __assert_fail
- defn can override this one. */
+ if (! _dl_loaded->l_info[DT_NEEDED])
+ _dl_sysdep_message ("\t", "statically linked\n", NULL);
+ else
+ for (l = _dl_loaded->l_next; l; l = l->l_next)
+ {
+ char buf[20], *bp;
+ buf[sizeof buf - 1] = '\0';
+ bp = _itoa (l->l_addr, &buf[sizeof buf - 1], 16, 0);
+ while (&buf[sizeof buf - 1] - bp < sizeof l->l_addr * 2)
+ *--bp = '0';
+ _dl_sysdep_message ("\t", l->l_libname, " => ", l->l_name,
+ " (0x", bp, ")\n", NULL);
+ }
-#include "../stdio/_itoa.h"
+ if (mode != trace)
+ for (i = 1; i < _dl_argc; ++i)
+ {
+ const ElfW(Sym) *ref = NULL;
+ ElfW(Addr) loadbase = _dl_lookup_symbol (_dl_argv[i], &ref,
+ &_dl_default_scope[2],
+ "argument",
+ DL_LOOKUP_NOPLT);
+ char buf[20], *bp;
+ buf[sizeof buf - 1] = '\0';
+ bp = _itoa (ref->st_value, &buf[sizeof buf - 1], 16, 0);
+ while (&buf[sizeof buf - 1] - bp < sizeof loadbase * 2)
+ *--bp = '0';
+ _dl_sysdep_message (_dl_argv[i], " found at 0x", bp, NULL);
+ buf[sizeof buf - 1] = '\0';
+ bp = _itoa (loadbase, &buf[sizeof buf - 1], 16, 0);
+ while (&buf[sizeof buf - 1] - bp < sizeof loadbase * 2)
+ *--bp = '0';
+ _dl_sysdep_message (" in object at 0x", bp, "\n", NULL);
+ }
-void
-__assert_fail (const char *assertion,
- const char *file, unsigned int line, const char *function)
-{
- char buf[64];
- buf[sizeof buf - 1] = '\0';
- _dl_sysdep_fatal ("BUG IN DYNAMIC LINKER ld.so: ",
- file, ": ", _itoa (line, buf + sizeof buf - 1, 10, 0),
- ": ", function ?: "", function ? ": " : "",
- "Assertion `", assertion, "' failed!\n",
- NULL);
+ _exit (0);
+ }
-}
-weak_symbol (__assert_fail)
+ lazy = !__libc_enable_secure && *(getenv ("LD_BIND_NOW") ?: "") == '\0';
+
+ {
+ /* Now we have all the objects loaded. Relocate them all except for
+ the dynamic linker itself. We do this in reverse order so that copy
+ relocs of earlier objects overwrite the data written by later
+ objects. We do not re-relocate the dynamic linker itself in this
+ loop because that could result in the GOT entries for functions we
+ call being changed, and that would break us. It is safe to relocate
+ the dynamic linker out of order because it has no copy relocs (we
+ know that because it is self-contained). */
+
+ l = _dl_loaded;
+ while (l->l_next)
+ l = l->l_next;
+ do
+ {
+ if (l != &_dl_rtld_map)
+ {
+ _dl_relocate_object (l, _dl_object_relocation_scope (l), lazy);
+ *_dl_global_scope_end = NULL;
+ }
+ l = l->l_prev;
+ } while (l);
-void
-__assert_perror_fail (int errnum,
- const char *file, unsigned int line,
- const char *function)
-{
- char buf[64];
- buf[sizeof buf - 1] = '\0';
- _dl_sysdep_fatal ("BUG IN DYNAMIC LINKER ld.so: ",
- file, ": ", _itoa (line, buf + sizeof buf - 1, 10, 0),
- ": ", function ?: "", function ? ": " : "",
- "Unexpected error: ", strerror (errnum), "\n", NULL);
+ /* Do any necessary cleanups for the startup OS interface code.
+ We do these now so that no calls are made after rtld re-relocation
+ which might be resolved to different functions than we expect.
+ We cannot do this before relocating the other objects because
+ _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */
+ _dl_sysdep_start_cleanup ();
-}
-weak_symbol (__assert_perror_fail)
+ if (_dl_rtld_map.l_opencount > 0)
+ /* There was an explicit ref to the dynamic linker as a shared lib.
+ Re-relocate ourselves with user-controlled symbol definitions. */
+ _dl_relocate_object (&_dl_rtld_map, &_dl_default_scope[2], 0);
+ }
+
+ {
+ /* Initialize _r_debug. */
+ struct r_debug *r = _dl_debug_initialize (_dl_rtld_map.l_addr);
+
+ l = _dl_loaded;
+
+#ifdef ELF_MACHINE_DEBUG_SETUP
+
+ /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */
+
+ ELF_MACHINE_DEBUG_SETUP (l, r);
+ ELF_MACHINE_DEBUG_SETUP (&_dl_rtld_map, r);
+
+#else
+
+ if (l->l_info[DT_DEBUG])
+ /* There is a DT_DEBUG entry in the dynamic section. Fill it in
+ with the run-time address of the r_debug structure */
+ l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
+
+ /* Fill in the pointer in the dynamic linker's own dynamic section, in
+ case you run gdb on the dynamic linker directly. */
+ if (_dl_rtld_map.l_info[DT_DEBUG])
+ _dl_rtld_map.l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
#endif
+
+ /* Notify the debugger that all objects are now mapped in. */
+ r->r_state = RT_ADD;
+ _dl_debug_state ();
+ }
+
+ if (_dl_rtld_map.l_info[DT_INIT])
+ {
+ /* Call the initializer for the compatibility version of the
+ dynamic linker. There is no additional initialization
+ required for the ABI-compliant dynamic linker. */
+
+ (*(void (*) (int, char **, char**))
+ (_dl_rtld_map.l_addr + _dl_rtld_map.l_info[DT_INIT]->d_un.d_ptr))
+ (0, NULL, NULL);
+
+ /* Clear the field so a future dlopen won't run it again. */
+ _dl_rtld_map.l_info[DT_INIT] = NULL;
+ }
+
+ /* We finished the intialization and will start up. */
+ _dl_starting_up = 1;
+
+ /* Once we return, _dl_sysdep_start will invoke
+ the DT_INIT functions and then *USER_ENTRY. */
+}
git://sourceware.org / glibc.git / blobdiff