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Diffstat (limited to 'ldso/libdl/dlib.c')
-rw-r--r--ldso/libdl/dlib.c644
1 files changed, 0 insertions, 644 deletions
diff --git a/ldso/libdl/dlib.c b/ldso/libdl/dlib.c
deleted file mode 100644
index babcbc9c0..000000000
--- a/ldso/libdl/dlib.c
+++ /dev/null
@@ -1,644 +0,0 @@
-/*
- * libdl.c
- *
- * Functions required for dlopen et. al.
- */
-
-#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 *, int)
- __attribute__ ((__weak__, __alias__ ("foobar")));
-extern struct elf_resolve * _dl_check_if_named_library_is_loaded(const char *, int)
- __attribute__ ((__weak__, __alias__ ("foobar")));
-extern int _dl_fixup(struct dyn_elf *rpnt, int lazy)
- __attribute__ ((__weak__, __alias__ ("foobar")));
-#ifdef __mips__
-extern void _dl_perform_mips_global_got_relocations(struct elf_resolve *tpnt)
- __attribute__ ((__weak__, __alias__ ("foobar")));
-#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")));
-#endif
-
-#else /* __PIC__ */
-
-#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;
-#endif
-char *_dl_library_path = 0;
-char *_dl_ldsopath = 0;
-struct r_debug *_dl_debug_addr = NULL;
-static unsigned char *_dl_malloc_addr, *_dl_mmap_zero;
-#include "../ldso/_dl_progname.h" /* Pull in the name of ld.so */
-#include "../ldso/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);
-#endif
-
-static int do_dlclose(void *, int need_fini);
-
-
-static const char *dl_error_names[] = {
- "",
- "File not found",
- "Unable to open /dev/zero",
- "Not an ELF file",
-#if defined (__i386__)
- "Not i386 binary",
-#elif defined (__sparc__)
- "Not sparc binary",
-#elif defined (__mc68000__)
- "Not m68k binary",
-#else
- "Unrecognized binary type",
-#endif
- "Not an ELF shared library",
- "Unable to mmap file",
- "No dynamic section",
-#ifdef ELF_USES_RELOCA
- "Unable to process REL relocs",
-#else
- "Unable to process RELA relocs",
-#endif
- "Bad handle",
- "Unable to resolve symbol"
-};
-
-static void __attribute__ ((destructor)) dl_cleanup(void)
-{
- struct dyn_elf *d;
-
- 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;
- }
-}
-
-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;
- ElfW(Addr) from;
- struct elf_resolve *tpnt1;
- void (*dl_brk) (void);
-
- /* A bit of sanity checking... */
- if (!(flag & (RTLD_LAZY|RTLD_NOW))) {
- _dl_error_number = LD_BAD_HANDLE;
- return NULL;
- }
-
- from = (ElfW(Addr)) __builtin_return_address(0);
-
- /* Have the dynamic linker use the regular malloc function now */
- if (!dl_init) {
- dl_init++;
- _dl_malloc_function = malloc;
- }
-
- /* Cover the trivial case first */
- if (!libname)
- return _dl_symbol_tables;
-
- _dl_map_cache();
-
- /*
- * Try and locate the module we were called from - we
- * need this so that we get the correct RPATH. 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;
- }
-
- /* 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);
-#endif
- 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;
-
- 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;
- }
-
-
-#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;
- 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, 0))) {
- goto oops;
- }
-
- 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;
-
- }
- }
- }
-
- /*
- * OK, now attach the entire chain at the end
- */
- rpnt->next = _dl_symbol_tables;
-
-#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);
-#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))
- goto oops;
-
- /* 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 (dl_brk != NULL) {
- _dl_debug_addr->r_state = RT_ADD;
- (*dl_brk) ();
-
- _dl_debug_addr->r_state = RT_CONSISTENT;
- (*dl_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;
- 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);
- }
- }
- }
-#endif
- return (void *) dyn_chain;
-
-oops:
- /* Something went wrong. Clean up and return NULL. */
- _dl_unmap_cache();
- do_dlclose(dyn_chain, 0);
- return NULL;
-}
-
-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;
-
- handle = (struct dyn_elf *) vhandle;
-
- /* First of all verify that we have a real handle
- of some kind. Return NULL if not a valid handle. */
-
- if (handle == NULL)
- handle = _dl_symbol_tables;
- else if (handle != RTLD_NEXT && handle != _dl_symbol_tables) {
- for (rpnt = _dl_handles; rpnt; rpnt = rpnt->next_handle)
- if (rpnt == handle)
- break;
- if (!rpnt) {
- _dl_error_number = LD_BAD_HANDLE;
- return NULL;
- }
- } else if (handle == RTLD_NEXT) {
- /*
- * Try and locate the module we were called from - we
- * need this so that we know where to start searching
- * from. We never pass RTLD_NEXT down into the actual
- * dynamic loader itself, as it doesn't know
- * how to properly treat it.
- */
- from = (ElfW(Addr)) __builtin_return_address(0);
-
- tfrom = NULL;
- for (rpnt = _dl_symbol_tables; rpnt; rpnt = rpnt->next) {
- tpnt = rpnt->dyn;
- if (tpnt->loadaddr < from
- && (tfrom == NULL || tfrom->loadaddr < tpnt->loadaddr)) {
- tfrom = tpnt;
- handle = rpnt->next;
- }
- }
- }
-
- ret = _dl_find_hash((char*)name, handle, NULL, copyrel);
-
- /*
- * Nothing found.
- */
- if (!ret)
- _dl_error_number = LD_NO_SYMBOL;
- return ret;
-}
-
-int _dlclose(void *vhandle)
-{
- return do_dlclose(vhandle, 1);
-}
-
-static int do_dlclose(void *vhandle, int need_fini)
-{
- struct dyn_elf *rpnt, *rpnt1;
- struct dyn_elf *spnt, *spnt1;
- ElfW(Phdr) *ppnt;
- struct elf_resolve *tpnt;
- int (*dl_elf_fini) (void);
- void (*dl_brk) (void);
- struct dyn_elf *handle;
- unsigned int end;
- int i = 0;
-
- handle = (struct dyn_elf *) vhandle;
- rpnt1 = NULL;
- for (rpnt = _dl_handles; rpnt; rpnt = rpnt->next_handle) {
- if (rpnt == handle) {
- break;
- }
- rpnt1 = rpnt;
- }
-
- if (!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;
-
- /* 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) ();
- }
-#endif
- end = 0;
- for (i = 0, ppnt = rpnt->dyn->ppnt;
- i < rpnt->dyn->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;
- 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;
- break;
- }
- free(rpnt->dyn->libname);
- free(rpnt->dyn);
- }
- free(rpnt);
- }
-
-
- 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) ();
- }
- }
-
- return 0;
-}
-
-const char *_dlerror(void)
-{
- const char *retval;
-
- if (!_dl_error_number)
- return NULL;
- retval = dl_error_names[_dl_error_number];
- _dl_error_number = 0;
- return retval;
-}
-
-/*
- * Dump information to stderrr about the current loaded modules
- */
-static char *type[] = { "Lib", "Exe", "Int", "Mod" };
-
-void _dlinfo(void)
-{
- struct elf_resolve *tpnt;
- struct dyn_elf *rpnt, *hpnt;
-
- _dl_dprintf(2, "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);
- }
-
- /* Next dump the module list for the application itself */
- _dl_dprintf(2, "\nModules for application (%x):\n",
- (unsigned) _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);
-
- for (hpnt = _dl_handles; hpnt; hpnt = hpnt->next_handle) {
- _dl_dprintf(2, "Modules for handle %x\n", (unsigned) hpnt);
- for (rpnt = hpnt; rpnt; rpnt = rpnt->next)
- _dl_dprintf(2, "\t%x %s\n", (unsigned) rpnt->dyn,
- rpnt->dyn->libname);
- }
-}
-
-int _dladdr(void *__address, Dl_info * __dlip)
-{
- struct elf_resolve *pelf;
- struct elf_resolve *rpnt;
-
- _dl_map_cache();
-
- /*
- * Try and locate the module address is in
- */
- pelf = NULL;
-
-#if 0
- _dl_dprintf(2, "dladdr( %x, %x )\n", __address, __dlip);
-#endif
-
- 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;
- }
- }
-
- if (!pelf) {
- return 0;
- }
-
- /*
- * Try and locate the symbol of address
- */
-
- {
- char *strtab;
- Elf32_Sym *symtab;
- int hn, si;
- int sf;
- int sn = 0;
- ElfW(Addr) sa;
-
- sa = 0;
- symtab = (Elf32_Sym *) (pelf->dynamic_info[DT_SYMTAB] + pelf->loadaddr);
- strtab = (char *) (pelf->dynamic_info[DT_STRTAB] + pelf->loadaddr);
-
- sf = 0;
- 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;
- 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
- }
- }
-
- 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;
- }
- return 1;
- }
-}