+/* vi: set sw=4 ts=4: */
/*
- * libdl.c
- *
- * Functions required for dlopen et. al.
+ * Program to load an ELF binary on a linux system, and run it
+ * after resolving ELF shared library symbols
+ *
+ * Copyright (C) 2000-2006 by Erik Andersen <andersen@uclibc.org>
+ * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
+ * David Engel, Hongjiu Lu and Mitch D'Souza
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. The name of the above contributors may not be
+ * used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
*/
-#include <ldso.h>
-
-
-/* The public interfaces */
-void *dlopen(const char *, int) __attribute__ ((__weak__, __alias__ ("_dlopen")));
-int dlclose(void *) __attribute__ ((__weak__, __alias__ ("_dlclose")));
-void *dlsym(void *, const char *) __attribute__ ((__weak__, __alias__ ("_dlsym")));
-const char *dlerror(void) __attribute__ ((__weak__, __alias__ ("_dlerror")));
-int dladdr(void *, Dl_info *) __attribute__ ((__weak__, __alias__ ("_dladdr")));
-void _dlinfo(void);
-
-#ifdef __PIC__
-/* This is a real hack. We need access to the dynamic linker, but we
-also need to make it possible to link against this library without any
-unresolved externals. We provide these weak symbols to make the link
-possible, but at run time the normal symbols are accessed. */
-static void __attribute__ ((unused)) foobar(void)
-{
- const char msg[]="libdl library not correctly linked\n";
- _dl_write(2, msg, _dl_strlen(msg));
- _dl_exit(1);
-}
-
-static int __attribute__ ((unused)) foobar1 = (int) foobar; /* Use as pointer */
-extern void _dl_dprintf(int, const char *, ...) __attribute__ ((__weak__, __alias__ ("foobar")));
-extern char *_dl_find_hash(const char *, struct dyn_elf *, struct elf_resolve *, enum caller_type)
- __attribute__ ((__weak__, __alias__ ("foobar")));
-extern struct elf_resolve * _dl_load_shared_library(int, struct dyn_elf **, struct elf_resolve *, char *)
- __attribute__ ((__weak__, __alias__ ("foobar")));
-extern struct elf_resolve * _dl_check_if_named_library_is_loaded(const char *full_libname)
- __attribute__ ((__weak__, __alias__ ("foobar")));
-extern int _dl_fixup(struct dyn_elf *rpnt, int lazy)
- __attribute__ ((__weak__, __alias__ ("foobar")));
+#include <ldso.h>
+#include <stdio.h>
+#include <string.h> /* Needed for 'strstr' prototype' */
+#include <stdbool.h>
+
+
+#ifdef SHARED
+
+/* When libdl is loaded as a shared library, we need to load in
+ * and use a pile of symbols from ldso... */
+
+extern char *_dl_find_hash(const char *, struct dyn_elf *, struct elf_resolve *, int);
+extern struct elf_resolve * _dl_load_shared_library(int, struct dyn_elf **,
+ struct elf_resolve *, char *, int);
+extern int _dl_fixup(struct dyn_elf *rpnt, int lazy);
+extern void _dl_protect_relro(struct elf_resolve * tpnt);
+extern int _dl_errno;
+extern struct dyn_elf *_dl_symbol_tables;
+extern struct dyn_elf *_dl_handles;
+extern struct elf_resolve *_dl_loaded_modules;
+extern struct r_debug *_dl_debug_addr;
+extern unsigned long _dl_error_number;
+extern void *(*_dl_malloc_function)(size_t);
+extern void (*_dl_free_function) (void *p);
+extern void _dl_run_init_array(struct elf_resolve *);
+extern void _dl_run_fini_array(struct elf_resolve *);
+#ifdef __LDSO_CACHE_SUPPORT__
+int _dl_map_cache(void);
+int _dl_unmap_cache(void);
+#endif
#ifdef __mips__
-extern void _dl_perform_mips_global_got_relocations(struct elf_resolve *tpnt)
- __attribute__ ((__weak__, __alias__ ("foobar")));
+extern void _dl_perform_mips_global_got_relocations(struct elf_resolve *tpnt, int lazy);
#endif
-#ifdef USE_CACHE
-int _dl_map_cache(void) __attribute__ ((__weak__, __alias__ ("foobar")));
-int _dl_unmap_cache(void) __attribute__ ((__weak__, __alias__ ("foobar")));
-#endif
-
-extern struct dyn_elf *_dl_symbol_tables __attribute__ ((__weak__, __alias__ ("foobar1")));
-extern struct dyn_elf *_dl_handles __attribute__ ((__weak__, __alias__ ("foobar1")));
-extern struct elf_resolve *_dl_loaded_modules __attribute__ ((__weak__, __alias__ ("foobar1")));
-extern struct r_debug *_dl_debug_addr __attribute__ ((__weak__, __alias__ ("foobar1")));
-extern unsigned long _dl_error_number __attribute__ ((__weak__, __alias__ ("foobar1")));
-extern void *(*_dl_malloc_function)(size_t) __attribute__ ((__weak__, __alias__ ("foobar1")));
#ifdef __SUPPORT_LD_DEBUG__
-extern char *_dl_debug __attribute__ ((__weak__, __alias__ ("foobar1")));
-extern char *_dl_debug_symbols __attribute__ ((__weak__, __alias__ ("foobar1")));
-extern char *_dl_debug_move __attribute__ ((__weak__, __alias__ ("foobar1")));
-extern char *_dl_debug_reloc __attribute__ ((__weak__, __alias__ ("foobar1")));
-extern char *_dl_debug_detail __attribute__ ((__weak__, __alias__ ("foobar1")));
-extern char *_dl_debug_nofixups __attribute__ ((__weak__, __alias__ ("foobar1")));
-extern char *_dl_debug_bindings __attribute__ ((__weak__, __alias__ ("foobar1")));
-extern int _dl_debug_file __attribute__ ((__weak__, __alias__ ("foobar1")));
+extern char *_dl_debug;
#endif
-#else /* __PIC__ */
+#else /* !SHARED */
+
+#define _dl_malloc malloc
+#define _dl_free free
+
+/* When libdl is linked as a static library, we need to replace all
+ * the symbols that otherwise would have been loaded in from ldso... */
#ifdef __SUPPORT_LD_DEBUG__
-char *_dl_debug = 0;
-char *_dl_debug_symbols = 0;
-char *_dl_debug_move = 0;
-char *_dl_debug_reloc = 0;
-char *_dl_debug_detail = 0;
-char *_dl_debug_nofixups = 0;
-char *_dl_debug_bindings = 0;
-int _dl_debug_file = 2;
+char *_dl_debug = NULL;
+char *_dl_debug_symbols = NULL;
+char *_dl_debug_move = NULL;
+char *_dl_debug_reloc = NULL;
+char *_dl_debug_detail = NULL;
+char *_dl_debug_nofixups = NULL;
+char *_dl_debug_bindings = NULL;
+int _dl_debug_file = NULL;
#endif
-char *_dl_library_path = 0;
-char *_dl_ldsopath = 0;
+const char *_dl_progname = ""; /* Program name */
+void *(*_dl_malloc_function)(size_t);
+void (*_dl_free_function) (void *p);
+char *_dl_library_path = NULL; /* Where we look for libraries */
+char *_dl_ldsopath = NULL; /* Location of the shared lib loader */
+int _dl_errno = 0; /* We can't use the real errno in ldso */
+size_t _dl_pagesize = PAGE_SIZE; /* Store the page size for use later */
+/* This global variable is also to communicate with debuggers such as gdb. */
struct r_debug *_dl_debug_addr = NULL;
-static char *_dl_malloc_addr, *_dl_mmap_zero;
-#include "../ldso/_dl_progname.h" /* Pull in the name of ld.so */
-#include "../ldso/hash.c"
+
+#include "../ldso/dl-array.c"
+#include "../ldso/dl-debug.c"
+#include LDSO_ELFINTERP
+#include "../ldso/dl-hash.c"
#define _dl_trace_loaded_objects 0
-#include "../ldso/readelflib1.c"
-void *(*_dl_malloc_function) (size_t size);
-int _dl_fixup(struct dyn_elf *rpnt, int lazy);
+#include "../ldso/dl-elf.c"
+#endif /* SHARED */
+
+#ifdef __SUPPORT_LD_DEBUG__
+# define _dl_if_debug_print(fmt, args...) \
+ do { \
+ if (_dl_debug) \
+ fprintf(stderr, "%s():%i: " fmt, __FUNCTION__, __LINE__, ## args); \
+ } while (0)
+#else
+# define _dl_if_debug_print(fmt, args...)
#endif
static int do_dlclose(void *, int need_fini);
-static const char *dl_error_names[] = {
+static const char *const dl_error_names[] = {
"",
"File not found",
"Unable to open /dev/zero",
"Unable to resolve symbol"
};
-static void __attribute__ ((destructor)) dl_cleanup(void)
+void dl_cleanup(void) __attribute__ ((destructor));
+void dl_cleanup(void)
{
- struct dyn_elf *d;
+ struct dyn_elf *h, *n;
- for (d = _dl_handles; d; d = d->next_handle)
- if (d->dyn->libtype == loaded_file && d->dyn->dynamic_info[DT_FINI]) {
- (* ((int (*)(void)) (d->dyn->loadaddr + d->dyn->dynamic_info[DT_FINI]))) ();
- d->dyn->dynamic_info[DT_FINI] = 0;
- }
+ for (h = _dl_handles; h; h = n) {
+ n = h->next_handle;
+ do_dlclose(h, 1);
+ }
}
-void *_dlopen(const char *libname, int flag)
+void *dlopen(const char *libname, int flag)
{
- struct elf_resolve *tpnt, *tfrom, *tcurr;
- struct dyn_elf *dyn_chain, *rpnt = NULL;
- struct dyn_elf *dpnt;
- static int dl_init = 0;
+ struct elf_resolve *tpnt, *tfrom;
+ struct dyn_elf *dyn_chain, *rpnt = NULL, *dyn_ptr, *relro_ptr, *handle;
ElfW(Addr) from;
struct elf_resolve *tpnt1;
void (*dl_brk) (void);
+ int now_flag;
+ struct init_fini_list *tmp, *runp, *runp2, *dep_list;
+ unsigned int nlist, i;
+ struct elf_resolve **init_fini_list;
+ static bool _dl_init;
/* A bit of sanity checking... */
if (!(flag & (RTLD_LAZY|RTLD_NOW))) {
from = (ElfW(Addr)) __builtin_return_address(0);
- /* Have the dynamic linker use the regular malloc function now */
- if (!dl_init) {
- dl_init++;
+ if (!_dl_init) {
+ _dl_init = true;
_dl_malloc_function = malloc;
+ _dl_free_function = free;
}
-
/* Cover the trivial case first */
if (!libname)
return _dl_symbol_tables;
+#ifndef SHARED
+# ifdef __SUPPORT_LD_DEBUG__
+ _dl_debug = getenv("LD_DEBUG");
+ if (_dl_debug) {
+ if (_dl_strstr(_dl_debug, "all")) {
+ _dl_debug_detail = _dl_debug_move = _dl_debug_symbols
+ = _dl_debug_reloc = _dl_debug_bindings = _dl_debug_nofixups = (void*)1;
+ } else {
+ _dl_debug_detail = strstr(_dl_debug, "detail");
+ _dl_debug_move = strstr(_dl_debug, "move");
+ _dl_debug_symbols = strstr(_dl_debug, "sym");
+ _dl_debug_reloc = strstr(_dl_debug, "reloc");
+ _dl_debug_nofixups = strstr(_dl_debug, "nofix");
+ _dl_debug_bindings = strstr(_dl_debug, "bind");
+ }
+ }
+# endif
+#endif
+
_dl_map_cache();
/*
* Try and locate the module we were called from - we
- * need this so that we get the correct RPATH. Note that
+ * need this so that we get the correct RPATH/RUNPATH. Note that
* this is the current behavior under Solaris, but the
* ABI+ specifies that we should only use the RPATH from
* the application. Thus this may go away at some time
* in the future.
*/
- tfrom = NULL;
- for (dpnt = _dl_symbol_tables; dpnt; dpnt = dpnt->next) {
- tpnt = dpnt->dyn;
- if (tpnt->loadaddr < from
- && (tfrom == NULL || tfrom->loadaddr < tpnt->loadaddr))
- tfrom = tpnt;
+ {
+ struct dyn_elf *dpnt;
+ tfrom = NULL;
+ for (dpnt = _dl_symbol_tables; dpnt; dpnt = dpnt->next) {
+ tpnt = dpnt->dyn;
+ if (DL_ADDR_IN_LOADADDR(from, tpnt, tfrom))
+ tfrom = tpnt;
+ }
}
+ for (rpnt = _dl_symbol_tables; rpnt && rpnt->next; rpnt = rpnt->next)
+ continue;
- /* Try to load the specified library */
-#ifdef __SUPPORT_LD_DEBUG__
- if(_dl_debug)
- _dl_dprintf(_dl_debug_file, "Trying to dlopen '%s'\n", (char*)libname);
+ relro_ptr = rpnt;
+ now_flag = (flag & RTLD_NOW) ? RTLD_NOW : 0;
+ if (getenv("LD_BIND_NOW"))
+ now_flag = RTLD_NOW;
+
+#ifndef SHARED
+ /* When statically linked, the _dl_library_path is not yet initialized */
+ _dl_library_path = getenv("LD_LIBRARY_PATH");
#endif
- tpnt = _dl_load_shared_library(0, &rpnt, tfrom, (char*)libname);
+
+ /* Try to load the specified library */
+ _dl_if_debug_print("Trying to dlopen '%s', RTLD_GLOBAL:%d RTLD_NOW:%d\n",
+ (char*)libname, (flag & RTLD_GLOBAL ? 1:0), (now_flag & RTLD_NOW ? 1:0));
+ tpnt = _dl_load_shared_library(0, &rpnt, tfrom, (char*)libname, 0);
+
if (tpnt == NULL) {
_dl_unmap_cache();
return NULL;
}
-
dyn_chain = (struct dyn_elf *) malloc(sizeof(struct dyn_elf));
_dl_memset(dyn_chain, 0, sizeof(struct dyn_elf));
dyn_chain->dyn = tpnt;
- dyn_chain->flags = flag;
- if (!tpnt->symbol_scope)
- tpnt->symbol_scope = dyn_chain;
+ tpnt->rtld_flags |= (flag & RTLD_GLOBAL);
dyn_chain->next_handle = _dl_handles;
- _dl_handles = rpnt = dyn_chain;
-
- if (tpnt->init_flag & INIT_FUNCS_CALLED) {
- /* If the init and fini stuff has already been run, that means
- * the dlopen'd library has already been loaded, and nothing
- * further needs to be done. */
- return (void *) dyn_chain;
+ _dl_handles = dyn_ptr = dyn_chain;
+
+ if (tpnt->usage_count > 1) {
+ _dl_if_debug_print("Lib: %s already opened\n", libname);
+ /* see if there is a handle from a earlier dlopen */
+ for (handle = _dl_handles->next_handle; handle; handle = handle->next_handle) {
+ if (handle->dyn == tpnt) {
+ dyn_chain->init_fini.init_fini = handle->init_fini.init_fini;
+ dyn_chain->init_fini.nlist = handle->init_fini.nlist;
+ for (i = 0; i < dyn_chain->init_fini.nlist; i++)
+ dyn_chain->init_fini.init_fini[i]->rtld_flags |= (flag & RTLD_GLOBAL);
+ dyn_chain->next = handle->next;
+ break;
+ }
+ }
+ return dyn_chain;
}
+ tpnt->init_flag |= DL_OPENED;
-#ifdef __SUPPORT_LD_DEBUG__
- if(_dl_debug)
- _dl_dprintf(_dl_debug_file, "Looking for needed libraries\n");
-#endif
-
- for (tcurr = tpnt; tcurr; tcurr = tcurr->next)
- {
- Elf32_Dyn *dpnt;
+ _dl_if_debug_print("Looking for needed libraries\n");
+ nlist = 0;
+ runp = alloca(sizeof(*runp));
+ runp->tpnt = tpnt;
+ runp->next = NULL;
+ dep_list = runp2 = runp;
+ for (; runp; runp = runp->next) {
+ ElfW(Dyn) *dpnt;
char *lpntstr;
- for (dpnt = (Elf32_Dyn *) tcurr->dynamic_addr; dpnt->d_tag; dpnt++) {
- if (dpnt->d_tag == DT_NEEDED) {
- char *name;
- lpntstr = (char*) (tcurr->loadaddr + tcurr->dynamic_info[DT_STRTAB] +
- dpnt->d_un.d_val);
- name = _dl_get_last_path_component(lpntstr);
-
-#ifdef __SUPPORT_LD_DEBUG__
- if(_dl_debug)
- _dl_dprintf(_dl_debug_file, "Trying to load '%s', needed by '%s'\n",
- lpntstr, tcurr->libname);
-#endif
-
- if (!(tpnt1 = _dl_load_shared_library(0, &rpnt, tcurr, lpntstr))) {
+ nlist++;
+ runp->tpnt->init_fini = NULL; /* clear any previous dependcies */
+ for (dpnt = (ElfW(Dyn) *) runp->tpnt->dynamic_addr; dpnt->d_tag; dpnt++) {
+ if (dpnt->d_tag == DT_NEEDED) {
+ lpntstr = (char*) (runp->tpnt->dynamic_info[DT_STRTAB] +
+ dpnt->d_un.d_val);
+ _dl_if_debug_print("Trying to load '%s', needed by '%s'\n",
+ lpntstr, runp->tpnt->libname);
+ tpnt1 = _dl_load_shared_library(0, &rpnt, runp->tpnt, lpntstr, 0);
+ if (!tpnt1)
goto oops;
- }
-#if 1
-//FIXME: Enabling this is _so_ wrong....
- /* We need global symbol resolution for everything
- * in the dependent chain */
- dyn_chain->flags |= RTLD_GLOBAL;
-#endif
-
- rpnt->next = (struct dyn_elf *) malloc(sizeof(struct dyn_elf));
- _dl_memset (rpnt->next, 0, sizeof (struct dyn_elf));
- rpnt = rpnt->next;
- if (!tpnt1->symbol_scope) tpnt1->symbol_scope = rpnt;
- rpnt->dyn = tpnt1;
+ tpnt1->rtld_flags |= (flag & RTLD_GLOBAL);
+
+ /* This list is for dlsym() and relocation */
+ dyn_ptr->next = (struct dyn_elf *) malloc(sizeof(struct dyn_elf));
+ _dl_memset (dyn_ptr->next, 0, sizeof (struct dyn_elf));
+ dyn_ptr = dyn_ptr->next;
+ dyn_ptr->dyn = tpnt1;
+ /* Used to record RTLD_LOCAL scope */
+ tmp = alloca(sizeof(struct init_fini_list));
+ tmp->tpnt = tpnt1;
+ tmp->next = runp->tpnt->init_fini;
+ runp->tpnt->init_fini = tmp;
+
+ for (tmp=dep_list; tmp; tmp = tmp->next) {
+ if (tpnt1 == tmp->tpnt) { /* if match => cirular dependency, drop it */
+ _dl_if_debug_print("Circular dependency, skipping '%s',\n",
+ tmp->tpnt->libname);
+ tpnt1->usage_count--;
+ break;
+ }
+ }
+ if (!tmp) { /* Don't add if circular dependency detected */
+ runp2->next = alloca(sizeof(*runp));
+ runp2 = runp2->next;
+ runp2->tpnt = tpnt1;
+ runp2->next = NULL;
+ }
+ }
+ }
+ }
+ init_fini_list = malloc(nlist * sizeof(struct elf_resolve *));
+ dyn_chain->init_fini.init_fini = init_fini_list;
+ dyn_chain->init_fini.nlist = nlist;
+ i = 0;
+ for (runp2 = dep_list; runp2; runp2 = runp2->next) {
+ init_fini_list[i++] = runp2->tpnt;
+ for (runp = runp2->tpnt->init_fini; runp; runp = runp->next) {
+ if (!(runp->tpnt->rtld_flags & RTLD_GLOBAL)) {
+ tmp = malloc(sizeof(struct init_fini_list));
+ tmp->tpnt = runp->tpnt;
+ tmp->next = runp2->tpnt->rtld_local;
+ runp2->tpnt->rtld_local = tmp;
+ }
+ }
+ }
+ /* Sort the INIT/FINI list in dependency order. */
+ for (runp2 = dep_list; runp2; runp2 = runp2->next) {
+ unsigned int j, k;
+ for (j = 0; init_fini_list[j] != runp2->tpnt; ++j)
+ /* Empty */;
+ for (k = j + 1; k < nlist; ++k) {
+ struct init_fini_list *ele = init_fini_list[k]->init_fini;
+
+ for (; ele; ele = ele->next) {
+ if (ele->tpnt == runp2->tpnt) {
+ struct elf_resolve *here = init_fini_list[k];
+ _dl_if_debug_print("Move %s from pos %d to %d in INIT/FINI list.\n", here->libname, k, j);
+ for (i = (k - j); i; --i)
+ init_fini_list[i+j] = init_fini_list[i+j-1];
+ init_fini_list[j] = here;
+ ++j;
+ break;
+ }
}
}
}
+#ifdef __SUPPORT_LD_DEBUG__
+ if (_dl_debug) {
+ fprintf(stderr, "\nINIT/FINI order and dependencies:\n");
+ for (i = 0; i < nlist; i++) {
+ fprintf(stderr, "lib: %s has deps:\n", init_fini_list[i]->libname);
+ runp = init_fini_list[i]->init_fini;
+ for (; runp; runp = runp->next)
+ fprintf(stderr, " %s ", runp->tpnt->libname);
+ fprintf(stderr, "\n");
+ }
+ }
+#endif
+ _dl_if_debug_print("Beginning dlopen relocation fixups\n");
/*
- * OK, now attach the entire chain at the end
- */
- rpnt->next = _dl_symbol_tables;
-
+ * OK, now all of the kids are tucked into bed in their proper addresses.
+ * Now we go through and look for REL and RELA records that indicate fixups
+ * to the GOT tables. We need to do this in reverse order so that COPY
+ * directives work correctly */
#ifdef __mips__
/*
* Relocation of the GOT entries for MIPS have to be done
* after all the libraries have been loaded.
*/
- _dl_perform_mips_global_got_relocations(tpnt);
+ _dl_perform_mips_global_got_relocations(tpnt, !now_flag);
#endif
-#ifdef __SUPPORT_LD_DEBUG__
- if(_dl_debug)
- _dl_dprintf(_dl_debug_file, "Beginning dlopen relocation fixups\n");
-#endif
- /*
- * OK, now all of the kids are tucked into bed in their proper addresses.
- * Now we go through and look for REL and RELA records that indicate fixups
- * to the GOT tables. We need to do this in reverse order so that COPY
- * directives work correctly */
- if (_dl_fixup(dyn_chain, dyn_chain->flags))
+ if (_dl_fixup(dyn_chain, now_flag))
goto oops;
+ if (relro_ptr) {
+ for (rpnt = relro_ptr->next; rpnt; rpnt = rpnt->next) {
+ if (rpnt->dyn->relro_size)
+ _dl_protect_relro(rpnt->dyn);
+ }
+ }
/* TODO: Should we set the protections of all pages back to R/O now ? */
-
/* Notify the debugger we have added some objects. */
if (_dl_debug_addr) {
dl_brk = (void (*)(void)) _dl_debug_addr->r_brk;
}
}
-#if 0 //def __SUPPORT_LD_DEBUG__
- if(_dl_debug)
- _dlinfo();
-#endif
-
-#ifdef __PIC__
- /* Find the last library so we can run things in the right order */
- for (tpnt = dyn_chain->dyn; tpnt->next!=NULL; tpnt = tpnt->next)
- ;
-
- /* Run the ctors and set up the dtors */
- for (; tpnt != dyn_chain->dyn->prev; tpnt=tpnt->prev)
- {
- /* Apparently crt1 for the application is responsible for handling this.
- * We only need to run the init/fini for shared libraries
- */
- if (tpnt->libtype == program_interpreter)
- continue;
- if (tpnt->libtype == elf_executable)
- continue;
+ /* Run the ctors and setup the dtors */
+ for (i = nlist; i; --i) {
+ tpnt = init_fini_list[i-1];
if (tpnt->init_flag & INIT_FUNCS_CALLED)
continue;
tpnt->init_flag |= INIT_FUNCS_CALLED;
if (tpnt->dynamic_info[DT_INIT]) {
- void (*dl_elf_func) (void);
- dl_elf_func = (void (*)(void)) (tpnt->loadaddr + tpnt->dynamic_info[DT_INIT]);
- if (dl_elf_func && *dl_elf_func != NULL) {
-#ifdef __SUPPORT_LD_DEBUG__
- if(_dl_debug)
- _dl_dprintf(2, "running ctors for library %s at '%x'\n", tpnt->libname, dl_elf_func);
-#endif
- (*dl_elf_func) ();
- }
- }
- if (tpnt->dynamic_info[DT_FINI]) {
- void (*dl_elf_func) (void);
- dl_elf_func = (void (*)(void)) (tpnt->loadaddr + tpnt->dynamic_info[DT_FINI]);
- if (dl_elf_func && *dl_elf_func != NULL) {
-#ifdef __SUPPORT_LD_DEBUG__
- if(_dl_debug)
- _dl_dprintf(2, "setting up dtors for library %s at '%x'\n", tpnt->libname, dl_elf_func);
-#endif
- atexit(dl_elf_func);
- }
+ void (*dl_elf_func) (void);
+ dl_elf_func = (void (*)(void)) DL_RELOC_ADDR(tpnt->loadaddr, tpnt->dynamic_info[DT_INIT]);
+ if (dl_elf_func) {
+ _dl_if_debug_print("running ctors for library %s at '%p'\n",
+ tpnt->libname, dl_elf_func);
+ DL_CALL_FUNC_AT_ADDR (dl_elf_func, tpnt->loadaddr, (void(*)(void)));
+ }
}
+
+ _dl_run_init_array(tpnt);
}
-#endif
+
+ _dl_unmap_cache();
return (void *) dyn_chain;
oops:
return NULL;
}
-void *_dlsym(void *vhandle, const char *name)
+void *dlsym(void *vhandle, const char *name)
{
struct elf_resolve *tpnt, *tfrom;
struct dyn_elf *handle;
ElfW(Addr) from;
struct dyn_elf *rpnt;
void *ret;
-
+ /* Nastiness to support underscore prefixes. */
+#ifdef __UCLIBC_UNDERSCORES__
+ char tmp_buf[80];
+ char *name2 = tmp_buf;
+ size_t nlen = strlen (name) + 1;
+ if (nlen + 1 > sizeof (tmp_buf))
+ name2 = malloc (nlen + 1);
+ if (name2 == 0) {
+ _dl_error_number = LD_ERROR_MMAP_FAILED;
+ return 0;
+ }
+ name2[0] = '_';
+ memcpy (name2 + 1, name, nlen);
+#else
+ const char *name2 = name;
+#endif
handle = (struct dyn_elf *) vhandle;
/* First of all verify that we have a real handle
break;
if (!rpnt) {
_dl_error_number = LD_BAD_HANDLE;
- return NULL;
+ ret = NULL;
+ goto out;
}
} else if (handle == RTLD_NEXT) {
/*
tfrom = NULL;
for (rpnt = _dl_symbol_tables; rpnt; rpnt = rpnt->next) {
tpnt = rpnt->dyn;
- if (tpnt->loadaddr < from
- && (tfrom == NULL || tfrom->loadaddr < tpnt->loadaddr)) {
+ if (DL_ADDR_IN_LOADADDR(from, tpnt, tfrom)) {
tfrom = tpnt;
handle = rpnt->next;
}
}
}
-
- ret = _dl_find_hash((char*)name, handle, NULL, copyrel);
+ tpnt = NULL;
+ if (handle == _dl_symbol_tables)
+ tpnt = handle->dyn; /* Only search RTLD_GLOBAL objs if global object */
+ ret = _dl_find_hash(name2, handle, tpnt, ELF_RTYPE_CLASS_DLSYM);
/*
* Nothing found.
*/
if (!ret)
_dl_error_number = LD_NO_SYMBOL;
+out:
+#ifdef __UCLIBC_UNDERSCORES__
+ if (name2 != tmp_buf)
+ free (name2);
+#endif
return ret;
}
-int _dlclose(void *vhandle)
+#if 0
+void *dlvsym(void *vhandle, const char *name, const char *version)
{
- return do_dlclose(vhandle, 1);
+ return dlsym(vhandle, name);
}
+#endif
static int do_dlclose(void *vhandle, int need_fini)
{
- struct dyn_elf *rpnt, *rpnt1;
- struct dyn_elf *spnt, *spnt1;
+ struct dyn_elf *rpnt, *rpnt1, *rpnt1_tmp;
+ struct init_fini_list *runp, *tmp;
ElfW(Phdr) *ppnt;
- struct elf_resolve *tpnt;
+ struct elf_resolve *tpnt, *run_tpnt;
int (*dl_elf_fini) (void);
void (*dl_brk) (void);
struct dyn_elf *handle;
unsigned int end;
- int i = 0;
+ unsigned int i, j;
handle = (struct dyn_elf *) vhandle;
+ if (handle == _dl_symbol_tables)
+ return 0;
rpnt1 = NULL;
for (rpnt = _dl_handles; rpnt; rpnt = rpnt->next_handle) {
- if (rpnt == handle) {
+ if (rpnt == handle)
break;
- }
rpnt1 = rpnt;
}
_dl_error_number = LD_BAD_HANDLE;
return 1;
}
-
- /* OK, this is a valid handle - now close out the file.
- * We check if we need to call fini () on the handle. */
- spnt = need_fini ? handle : handle->next;
- for (; spnt; spnt = spnt1) {
- spnt1 = spnt->next;
-
- /* We appended the module list to the end - when we get back here,
- quit. The access counts were not adjusted to account for being here. */
- if (spnt == _dl_symbol_tables)
- break;
- if (spnt->dyn->usage_count == 1
- && spnt->dyn->libtype == loaded_file) {
- tpnt = spnt->dyn;
- /* Apparently crt1 for the application is responsible for handling this.
- * We only need to run the init/fini for shared libraries
- */
-
- if (tpnt->dynamic_info[DT_FINI]) {
- dl_elf_fini = (int (*)(void)) (tpnt->loadaddr +
- tpnt->dynamic_info[DT_FINI]);
- (*dl_elf_fini) ();
- }
- }
- }
if (rpnt1)
rpnt1->next_handle = rpnt->next_handle;
else
_dl_handles = rpnt->next_handle;
-
+ _dl_if_debug_print("%s: usage count: %d\n",
+ handle->dyn->libname, handle->dyn->usage_count);
+ if (handle->dyn->usage_count != 1) {
+ handle->dyn->usage_count--;
+ free(handle);
+ return 0;
+ }
/* OK, this is a valid handle - now close out the file */
- for (rpnt = handle; rpnt; rpnt = rpnt1) {
- rpnt1 = rpnt->next;
-
- /* We appended the module list to the end - when we get back here,
- quit. The access counts were not adjusted to account for being here. */
- if (rpnt == _dl_symbol_tables)
- break;
-
- rpnt->dyn->usage_count--;
- if (rpnt->dyn->usage_count == 0
- && rpnt->dyn->libtype == loaded_file) {
- tpnt = rpnt->dyn;
- /* Apparently crt1 for the application is responsible for handling this.
- * We only need to run the init/fini for shared libraries
- */
-#if 0
-
- /* We have to do this above, before we start closing objects.
- * Otherwise when the needed symbols for _fini handling are
- * resolved a coredump would occur. Rob Ryan (robr@cmu.edu)*/
- if (tpnt->dynamic_info[DT_FINI]) {
- dl_elf_fini = (int (*)(void)) (tpnt->loadaddr + tpnt->dynamic_info[DT_FINI]);
- (*dl_elf_fini) ();
+ for (j = 0; j < handle->init_fini.nlist; ++j) {
+ tpnt = handle->init_fini.init_fini[j];
+ if (--tpnt->usage_count == 0) {
+ if ((tpnt->dynamic_info[DT_FINI]
+ || tpnt->dynamic_info[DT_FINI_ARRAY])
+ && need_fini
+ && !(tpnt->init_flag & FINI_FUNCS_CALLED)
+ ) {
+ tpnt->init_flag |= FINI_FUNCS_CALLED;
+ _dl_run_fini_array(tpnt);
+
+ if (tpnt->dynamic_info[DT_FINI]) {
+ dl_elf_fini = (int (*)(void)) DL_RELOC_ADDR(tpnt->loadaddr, tpnt->dynamic_info[DT_FINI]);
+ _dl_if_debug_print("running dtors for library %s at '%p'\n",
+ tpnt->libname, dl_elf_fini);
+ DL_CALL_FUNC_AT_ADDR (dl_elf_fini, tpnt->loadaddr, (int (*)(void)));
+ }
}
-#endif
+
+ _dl_if_debug_print("unmapping: %s\n", tpnt->libname);
end = 0;
- for (i = 0, ppnt = rpnt->dyn->ppnt;
- i < rpnt->dyn->n_phent; ppnt++, i++) {
+ for (i = 0, ppnt = tpnt->ppnt;
+ i < tpnt->n_phent; ppnt++, i++) {
if (ppnt->p_type != PT_LOAD)
continue;
if (end < ppnt->p_vaddr + ppnt->p_memsz)
end = ppnt->p_vaddr + ppnt->p_memsz;
}
- _dl_munmap((void*)rpnt->dyn->loadaddr, end);
- /* Next, remove rpnt->dyn from the loaded_module list */
- if (_dl_loaded_modules == rpnt->dyn) {
- _dl_loaded_modules = rpnt->dyn->next;
+ DL_LIB_UNMAP (tpnt, end);
+ /* Free elements in RTLD_LOCAL scope list */
+ for (runp = tpnt->rtld_local; runp; runp = tmp) {
+ tmp = runp->next;
+ free(runp);
+ }
+
+ /* Next, remove tpnt from the loaded_module list */
+ if (_dl_loaded_modules == tpnt) {
+ _dl_loaded_modules = tpnt->next;
if (_dl_loaded_modules)
_dl_loaded_modules->prev = 0;
- } else
- for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next)
- if (tpnt->next == rpnt->dyn) {
- tpnt->next = tpnt->next->next;
- if (tpnt->next)
- tpnt->next->prev = tpnt;
+ } else {
+ for (run_tpnt = _dl_loaded_modules; run_tpnt; run_tpnt = run_tpnt->next) {
+ if (run_tpnt->next == tpnt) {
+ _dl_if_debug_print("removing loaded_modules: %s\n", tpnt->libname);
+ run_tpnt->next = run_tpnt->next->next;
+ if (run_tpnt->next)
+ run_tpnt->next->prev = run_tpnt;
break;
}
- free(rpnt->dyn->libname);
- free(rpnt->dyn);
+ }
+ }
+
+ /* Next, remove tpnt from the global symbol table list */
+ if (_dl_symbol_tables) {
+ if (_dl_symbol_tables->dyn == tpnt) {
+ _dl_symbol_tables = _dl_symbol_tables->next;
+ if (_dl_symbol_tables)
+ _dl_symbol_tables->prev = 0;
+ } else {
+ for (rpnt1 = _dl_symbol_tables; rpnt1->next; rpnt1 = rpnt1->next) {
+ if (rpnt1->next->dyn == tpnt) {
+ _dl_if_debug_print("removing symbol_tables: %s\n", tpnt->libname);
+ rpnt1_tmp = rpnt1->next->next;
+ free(rpnt1->next);
+ rpnt1->next = rpnt1_tmp;
+ if (rpnt1->next)
+ rpnt1->next->prev = rpnt1;
+ break;
+ }
+ }
+ }
+ }
+ free(tpnt->libname);
+ free(tpnt);
}
- free(rpnt);
}
-
+ free(handle->init_fini.init_fini);
+ free(handle);
if (_dl_debug_addr) {
- dl_brk = (void (*)(void)) _dl_debug_addr->r_brk;
- if (dl_brk != NULL) {
- _dl_debug_addr->r_state = RT_DELETE;
- (*dl_brk) ();
-
- _dl_debug_addr->r_state = RT_CONSISTENT;
- (*dl_brk) ();
- }
+ dl_brk = (void (*)(void)) _dl_debug_addr->r_brk;
+ if (dl_brk != NULL) {
+ _dl_debug_addr->r_state = RT_DELETE;
+ (*dl_brk) ();
+
+ _dl_debug_addr->r_state = RT_CONSISTENT;
+ (*dl_brk) ();
+ }
}
return 0;
}
-const char *_dlerror(void)
+int dlclose(void *vhandle)
+{
+ return do_dlclose(vhandle, 1);
+}
+
+char *dlerror(void)
{
const char *retval;
return NULL;
retval = dl_error_names[_dl_error_number];
_dl_error_number = 0;
- return retval;
+ return (char *)retval;
}
/*
- * Dump information to stderrr about the current loaded modules
+ * Dump information to stderr about the current loaded modules
*/
-static char *type[] = { "Lib", "Exe", "Int", "Mod" };
+#ifdef __USE_GNU
+static const char type[][4] = { "Lib", "Exe", "Int", "Mod" };
-void _dlinfo(void)
+int dlinfo(void)
{
struct elf_resolve *tpnt;
struct dyn_elf *rpnt, *hpnt;
- _dl_dprintf(2, "List of loaded modules\n");
+ fprintf(stderr, "List of loaded modules\n");
/* First start with a complete list of all of the loaded files. */
- for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
- _dl_dprintf(2, "\t%x %x %x %s %d %s\n",
- (unsigned) tpnt->loadaddr, (unsigned) tpnt,
- (unsigned) tpnt->symbol_scope,
- type[tpnt->libtype],
- tpnt->usage_count, tpnt->libname);
+ for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
+ fprintf(stderr, "\t%p %p %p %s %d %s\n",
+ DL_LOADADDR_BASE(tpnt->loadaddr), tpnt, tpnt->symbol_scope,
+ type[tpnt->libtype],
+ tpnt->usage_count, tpnt->libname);
}
/* Next dump the module list for the application itself */
- _dl_dprintf(2, "\nModules for application (%x):\n",
- (unsigned) _dl_symbol_tables);
+ fprintf(stderr, "\nModules for application (%p):\n", _dl_symbol_tables);
for (rpnt = _dl_symbol_tables; rpnt; rpnt = rpnt->next)
- _dl_dprintf(2, "\t%x %s\n", (unsigned) rpnt->dyn, rpnt->dyn->libname);
+ fprintf(stderr, "\t%p %s\n", rpnt->dyn, rpnt->dyn->libname);
for (hpnt = _dl_handles; hpnt; hpnt = hpnt->next_handle) {
- _dl_dprintf(2, "Modules for handle %x\n", (unsigned) hpnt);
+ fprintf(stderr, "Modules for handle %p\n", hpnt);
for (rpnt = hpnt; rpnt; rpnt = rpnt->next)
- _dl_dprintf(2, "\t%x %s\n", (unsigned) rpnt->dyn,
- rpnt->dyn->libname);
+ fprintf(stderr, "\t%p %s\n", rpnt->dyn, rpnt->dyn->libname);
}
+ return 0;
}
-int _dladdr(void *__address, Dl_info * __dlip)
+int dladdr(const void *__address, Dl_info * __info)
{
struct elf_resolve *pelf;
struct elf_resolve *rpnt;
*/
pelf = NULL;
-#if 0
- _dl_dprintf(2, "dladdr( %x, %x )\n", __address, __dlip);
-#endif
+ _dl_if_debug_print("__address: %p __info: %p\n", __address, __info);
+
+ __address = DL_LOOKUP_ADDRESS (__address);
for (rpnt = _dl_loaded_modules; rpnt; rpnt = rpnt->next) {
struct elf_resolve *tpnt;
tpnt = rpnt;
-#if 0
- _dl_dprintf(2, "Module \"%s\" at %x\n",
- tpnt->libname, tpnt->loadaddr);
-#endif
- if (tpnt->loadaddr < (ElfW(Addr)) __address
- && (pelf == NULL || pelf->loadaddr < tpnt->loadaddr)) {
- pelf = tpnt;
- }
+
+ _dl_if_debug_print("Module \"%s\" at %p\n",
+ tpnt->libname, DL_LOADADDR_BASE(tpnt->loadaddr));
+
+ if (DL_ADDR_IN_LOADADDR((ElfW(Addr)) __address, tpnt, pelf))
+ pelf = tpnt;
}
if (!pelf) {
{
char *strtab;
- Elf32_Sym *symtab;
- int hn, si;
- int sf;
- int sn = 0;
- ElfW(Addr) sa;
+ ElfW(Sym) *symtab;
+ unsigned int hn, si, sn, sf;
+ ElfW(Addr) sa = 0;
+
+ /* Set the info for the object the address lies in */
+ __info->dli_fname = pelf->libname;
+ __info->dli_fbase = (void *)pelf->mapaddr;
+
+ symtab = (ElfW(Sym) *) (pelf->dynamic_info[DT_SYMTAB]);
+ strtab = (char *) (pelf->dynamic_info[DT_STRTAB]);
- sa = 0;
- symtab = (Elf32_Sym *) (pelf->dynamic_info[DT_SYMTAB] + pelf->loadaddr);
- strtab = (char *) (pelf->dynamic_info[DT_STRTAB] + pelf->loadaddr);
+ sf = sn = 0;
- sf = 0;
+#ifdef __LDSO_GNU_HASH_SUPPORT__
+ if (pelf->l_gnu_bitmask) {
+ for (hn = 0; hn < pelf->nbucket; hn++) {
+ si = pelf->l_gnu_buckets[hn];
+ if (!si)
+ continue;
+
+ const Elf32_Word *hasharr = &pelf->l_gnu_chain_zero[si];
+ do {
+ ElfW(Addr) symbol_addr;
+
+ symbol_addr = (ElfW(Addr)) DL_RELOC_ADDR(pelf->loadaddr, symtab[si].st_value);
+ if (symbol_addr <= (ElfW(Addr))__address && (!sf || sa < symbol_addr)) {
+ sa = symbol_addr;
+ sn = si;
+ sf = 1;
+ }
+ _dl_if_debug_print("Symbol \"%s\" at %p\n", strtab + symtab[si].st_name, symbol_addr);
+ ++si;
+ } while ((*hasharr++ & 1u) == 0);
+ }
+ } else
+#endif
for (hn = 0; hn < pelf->nbucket; hn++) {
for (si = pelf->elf_buckets[hn]; si; si = pelf->chains[si]) {
ElfW(Addr) symbol_addr;
- symbol_addr = pelf->loadaddr + symtab[si].st_value;
+ symbol_addr = (ElfW(Addr)) DL_RELOC_ADDR(pelf->loadaddr, symtab[si].st_value);
if (symbol_addr <= (ElfW(Addr))__address && (!sf || sa < symbol_addr)) {
sa = symbol_addr;
sn = si;
sf = 1;
}
-#if 0
- _dl_dprintf(2, "Symbol \"%s\" at %x\n",
- strtab + symtab[si].st_name, symbol_addr);
-#endif
+
+ _dl_if_debug_print("Symbol \"%s\" at %p\n",
+ strtab + symtab[si].st_name, symbol_addr);
}
}
if (sf) {
- __dlip->dli_fname = pelf->libname;
- __dlip->dli_fbase = (void *)pelf->loadaddr;
- __dlip->dli_sname = strtab + symtab[sn].st_name;
- __dlip->dli_saddr = (void *)sa;
+ /* A nearest symbol has been found; fill the entries */
+ __info->dli_sname = strtab + symtab[sn].st_name;
+ __info->dli_saddr = (void *)sa;
+ } else {
+ /* No symbol found, fill entries with NULL value,
+ only the containing object will be returned. */
+ __info->dli_sname = NULL;
+ __info->dli_saddr = NULL;
}
return 1;
}
}
+#endif
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