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Diffstat (limited to 'newlib/libc/sys/linux/dl/ldsodefs.h')
| -rw-r--r-- | newlib/libc/sys/linux/dl/ldsodefs.h | 535 |
1 files changed, 0 insertions, 535 deletions
diff --git a/newlib/libc/sys/linux/dl/ldsodefs.h b/newlib/libc/sys/linux/dl/ldsodefs.h deleted file mode 100644 index f24e1136b..000000000 --- a/newlib/libc/sys/linux/dl/ldsodefs.h +++ /dev/null @@ -1,535 +0,0 @@ -/* Run-time dynamic linker data structures for loaded ELF shared objects. - Copyright (C) 1995-1999, 2000, 2001 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 - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#ifndef _LDSODEFS_H -#define _LDSODEFS_H 1 - -#include <features.h> - -#define __need_size_t -#define __need_NULL -#include <stddef.h> -#include <string.h> - -#include <elf.h> -#include <dlfcn.h> -#include <link.h> -#include <dl-lookupcfg.h> -#include <bits/libc-lock.h> - -__BEGIN_DECLS - -/* We use this macro to refer to ELF types independent of the native wordsize. - `ElfW(TYPE)' is used in place of `Elf32_TYPE' or `Elf64_TYPE'. */ -#define ELFW(type) _ElfW (ELF, __ELF_NATIVE_CLASS, type) - -#define internal_function -/* All references to the value of l_info[DT_PLTGOT], - l_info[DT_STRTAB], l_info[DT_SYMTAB], l_info[DT_RELA], - l_info[DT_REL], l_info[DT_JMPREL], and l_info[VERSYMIDX (DT_VERSYM)] - have to be accessed via the D_PTR macro. The macro is needed since for - most architectures the entry is already relocated - but for some not - and we need to relocate at access time. */ -#ifdef DL_RO_DYN_SECTION -# define D_PTR(map,i) (map->i->d_un.d_ptr + map->l_addr) -#else -# define D_PTR(map,i) map->i->d_un.d_ptr -#endif - -/* On some platforms more information than just the address of the symbol - is needed from the lookup functions. In this case we return the whole - link map. */ -#ifdef DL_LOOKUP_RETURNS_MAP -typedef struct link_map *lookup_t; -# define LOOKUP_VALUE(map) map -# define LOOKUP_VALUE_ADDRESS(map) (map ? map->l_addr : 0) -#else -typedef ElfW(Addr) lookup_t; -# define LOOKUP_VALUE(map) map->l_addr -# define LOOKUP_VALUE_ADDRESS(address) address -#endif - -/* on some architectures a pointer to a function is not just a pointer - to the actual code of the function but rather an architecture - specific descriptor. */ -#ifndef ELF_FUNCTION_PTR_IS_SPECIAL -# define DL_SYMBOL_ADDRESS(map, ref) \ - (void *) (LOOKUP_VALUE_ADDRESS (map) + ref->st_value) -# define DL_LOOKUP_ADDRESS(addr) ((ElfW(Addr)) (addr)) -# define DL_DT_INIT_ADDRESS(map, start) (start) -# define DL_DT_FINI_ADDRESS(map, start) (start) -#endif - -/* Unmap a loaded object, called by _dl_close (). */ -#ifndef DL_UNMAP_IS_SPECIAL -# define DL_UNMAP(map) \ - __munmap ((void *) (map)->l_map_start, \ - (map)->l_map_end - (map)->l_map_start) -#endif - -/* By default we do not need special support to initialize DSOs loaded - by statically linked binaries. */ -#ifndef DL_STATIC_INIT -# define DL_STATIC_INIT(map) -#endif - -/* Reloc type classes as returned by elf_machine_type_class(). - ELF_RTYPE_CLASS_PLT means this reloc should not be satisfied by - some PLT symbol, ELF_RTYPE_CLASS_COPY means this reloc should not be - satisfied by any symbol in the executable. */ -#define ELF_RTYPE_CLASS_PLT 1 -#define ELF_RTYPE_CLASS_COPY 2 - -/* ELF uses the PF_x macros to specify the segment permissions, mmap - uses PROT_xxx. In most cases the three macros have the values 1, 2, - and 3 but not in a matching order. The following macros allows - converting from the PF_x values to PROT_xxx values. */ -#define PF_TO_PROT \ - ((PROT_READ << (PF_R * 4)) \ - | (PROT_WRITE << (PF_W * 4)) \ - | (PROT_EXEC << (PF_X * 4)) \ - | ((PROT_READ | PROT_WRITE) << ((PF_R | PF_W) * 4)) \ - | ((PROT_READ | PROT_EXEC) << ((PF_R | PF_X) * 4)) \ - | ((PROT_WRITE | PROT_EXEC) << (PF_W | PF_X) * 4) \ - | ((PROT_READ | PROT_WRITE | PROT_EXEC) << ((PF_R | PF_W | PF_X) * 4))) - - -/* For the version handling we need an array with only names and their - hash values. */ -struct r_found_version - { - const char *name; - ElfW(Word) hash; - - int hidden; - const char *filename; - }; - -/* We want to cache information about the searches for shared objects. */ - -enum r_dir_status { unknown, nonexisting, existing }; - -struct r_search_path_elem - { - /* This link is only used in the `all_dirs' member of `r_search_path'. */ - struct r_search_path_elem *next; - - /* Strings saying where the definition came from. */ - const char *what; - const char *where; - - /* Basename for this search path element. The string must end with - a slash character. */ - const char *dirname; - size_t dirnamelen; - - enum r_dir_status status[0]; - }; - -struct r_strlenpair - { - const char *str; - size_t len; - }; - - -/* A data structure for a simple single linked list of strings. */ -struct libname_list - { - const char *name; /* Name requested (before search). */ - struct libname_list *next; /* Link to next name for this object. */ - int dont_free; /* Flag whether this element should be freed - if the object is not entirely unloaded. */ - }; - - -/* Test whether given NAME matches any of the names of the given object. */ -static __inline int -__attribute__ ((unused)) -_dl_name_match_p (const char *__name, struct link_map *__map) -{ - int __found = strcmp (__name, __map->l_name) == 0; - struct libname_list *__runp = __map->l_libname; - - while (! __found && __runp != NULL) - if (strcmp (__name, __runp->name) == 0) - __found = 1; - else - __runp = __runp->next; - - return __found; -} - -/* Function used as argument for `_dl_receive_error' function. The - arguments are the error code, error string, and the objname the - error occurred in. */ -typedef void (*receiver_fct) (int, const char *, const char *); - -/* Internal functions of the run-time dynamic linker. - These can be accessed if you link again the dynamic linker - as a shared library, as in `-lld' or `/lib/ld.so' explicitly; - but are not normally of interest to user programs. - - The `-ldl' library functions in <dlfcn.h> provide a simple - user interface to run-time dynamic linking. */ - - -/* Parameters passed to the dynamic linker. */ -extern char **_dl_argv; - -/* Cached value of `getpagesize ()'. */ -extern size_t _dl_pagesize; - -/* OS version. */ -extern unsigned int _dl_osversion; - -/* File descriptor referring to the zero-fill device. */ -extern int _dl_zerofd; - -/* Name of the shared object to be profiled (if any). */ -extern const char *_dl_profile; -/* Map of shared object to be profiled. */ -extern struct link_map *_dl_profile_map; -/* Filename of the output file. */ -extern const char *_dl_profile_output; - -/* If nonzero the appropriate debug information is printed. */ -extern int _dl_debug_mask; -#define DL_DEBUG_LIBS (1 << 0) -#define DL_DEBUG_IMPCALLS (1 << 1) -#define DL_DEBUG_BINDINGS (1 << 2) -#define DL_DEBUG_SYMBOLS (1 << 3) -#define DL_DEBUG_VERSIONS (1 << 4) -#define DL_DEBUG_RELOC (1 << 5) -#define DL_DEBUG_FILES (1 << 6) -#define DL_DEBUG_STATISTICS (1 << 7) -/* This one is used only internally. */ -#define DL_DEBUG_HELP (1 << 8) - -/* Expect cache ID. */ -extern int _dl_correct_cache_id; - -/* Mask for hardware capabilities that are available. */ -extern unsigned long int _dl_hwcap; - -/* Mask for important hardware capabilities we honour. */ -extern unsigned long int _dl_hwcap_mask; - -/* File descriptor to write debug messages to. */ -extern int _dl_debug_fd; - -/* Names of shared object for which the RPATH should be ignored. */ -extern const char *_dl_inhibit_rpath; - -/* Nonzero if references should be treated as weak during runtime linking. */ -extern int _dl_dynamic_weak; - -/* The array with message we print as a last resort. */ -extern const char _dl_out_of_memory[]; - -/* Nonzero if runtime lookups should not update the .got/.plt. */ -extern int _dl_bind_not; - -/* List of search directories. */ -extern struct r_search_path_elem *_dl_all_dirs; -extern struct r_search_path_elem *_dl_init_all_dirs; - -/* OS-dependent function to open the zero-fill device. */ -extern int _dl_sysdep_open_zero_fill (void); /* dl-sysdep.c */ - - -/* During the program run we must not modify the global data of - loaded shared object simultanously in two threads. Therefore we - protect `_dl_open' and `_dl_close' in dl-close.c. - - This must be a recursive lock since the initializer function of - the loaded object might as well require a call to this function. - At this time it is not anymore a problem to modify the tables. */ -__libc_lock_define_recursive (extern, _dl_load_lock) - - -/* Write message on the debug file descriptor. The parameters are - interpreted as for a `printf' call. All the lines start with a - tag showing the PID. */ -extern void _dl_debug_printf (const char *fmt, ...) - __attribute__ ((__format__ (__printf__, 1, 2))); - -/* Write message on the debug file descriptor. The parameters are - interpreted as for a `printf' call. All the lines buf the first - start with a tag showing the PID. */ -extern void _dl_debug_printf_c (const char *fmt, ...) - __attribute__ ((__format__ (__printf__, 1, 2))); - - -/* Write a message on the specified descriptor FD. The parameters are - interpreted as for a `printf' call. */ -extern void _dl_dprintf (int fd, const char *fmt, ...) - __attribute__ ((__format__ (__printf__, 2, 3))); - -/* Write a message on the specified descriptor standard output. The - parameters are interpreted as for a `printf' call. */ -#define _dl_printf(fmt, args...) \ - _dl_dprintf (STDOUT_FILENO, fmt, ##args) - -/* Write a message on the specified descriptor standard error. The - parameters are interpreted as for a `printf' call. */ -#define _dl_error_printf(fmt, args...) \ - _dl_dprintf (STDERR_FILENO, fmt, ##args) - -/* Write a message on the specified descriptor standard error and exit - the program. The parameters are interpreted as for a `printf' call. */ -#define _dl_fatal_printf(fmt, args...) \ - do \ - { \ - _dl_dprintf (STDERR_FILENO, fmt, ##args); \ - _exit (127); \ - } \ - while (1) - - -/* This function is called by all the internal dynamic linker functions - when they encounter an error. ERRCODE is either an `errno' code or - zero; OBJECT is the name of the problematical shared object, or null if - it is a general problem; ERRSTRING is a string describing the specific - problem. */ -extern void _dl_signal_error (int errcode, const char *object, - const char *occurred, const char *errstring) - internal_function - __attribute__ ((__noreturn__)); - -/* Like _dl_signal_error, but may return when called in the context of - _dl_receive_error. */ -extern void _dl_signal_cerror (int errcode, const char *object, - const char *occation, const char *errstring) - internal_function; - -/* Call OPERATE, receiving errors from `dl_signal_cerror'. Unlike - `_dl_catch_error' the operation is resumed after the OPERATE - function returns. - ARGS is passed as argument to OPERATE. */ -extern void _dl_receive_error (receiver_fct fct, void (*operate) (void *), - void *args) - internal_function; - - -/* Open the shared object NAME and map in its segments. - LOADER's DT_RPATH is used in searching for NAME. - If the object is already opened, returns its existing map. - For preloaded shared objects PRELOADED is set to a non-zero - value to allow additional security checks. */ -extern struct link_map *_dl_map_object (struct link_map *loader, - const char *name, int preloaded, - int type, int trace_mode, int mode) - internal_function; - -/* Call _dl_map_object on the dependencies of MAP, and set up - MAP->l_searchlist. PRELOADS points to a vector of NPRELOADS previously - loaded objects that will be inserted into MAP->l_searchlist after MAP - but before its dependencies. */ -extern void _dl_map_object_deps (struct link_map *map, - struct link_map **preloads, - unsigned int npreloads, int trace_mode) - internal_function; - -/* Cache the locations of MAP's hash table. */ -extern void _dl_setup_hash (struct link_map *map) internal_function; - - -/* Search loaded objects' symbol tables for a definition of the symbol - referred to by UNDEF. *SYM is the symbol table entry containing the - reference; it is replaced with the defining symbol, and the base load - address of the defining object is returned. SYMBOL_SCOPE is a - null-terminated list of object scopes to search; each object's - l_searchlist (i.e. the segment of the dependency tree starting at that - object) is searched in turn. REFERENCE_NAME should name the object - containing the reference; it is used in error messages. - TYPE_CLASS describes the type of symbol we are looking for. */ -extern lookup_t _dl_lookup_symbol (const char *undef, - struct link_map *undef_map, - const ElfW(Sym) **sym, - struct r_scope_elem *symbol_scope[], - int type_class, int explicit) - internal_function; - -/* Lookup versioned symbol. */ -extern lookup_t _dl_lookup_versioned_symbol (const char *undef, - struct link_map *undef_map, - const ElfW(Sym) **sym, - struct r_scope_elem *symbol_scope[], - const struct r_found_version *version, - int type_class, int explicit) - internal_function; - -/* For handling RTLD_NEXT we must be able to skip shared objects. */ -extern lookup_t _dl_lookup_symbol_skip (const char *undef, - struct link_map *undef_map, - const ElfW(Sym) **sym, - struct r_scope_elem *symbol_scope[], - struct link_map *skip_this) - internal_function; - -/* For handling RTLD_NEXT with versioned symbols we must be able to - skip shared objects. */ -extern lookup_t _dl_lookup_versioned_symbol_skip (const char *undef, - struct link_map *undef_map, - const ElfW(Sym) **sym, - struct r_scope_elem *symbol_scope[], - const struct r_found_version *version, - struct link_map *skip_this) - internal_function; - -/* Look up symbol NAME in MAP's scope and return its run-time address. */ -extern ElfW(Addr) _dl_symbol_value (struct link_map *map, const char *name) - internal_function; - - -/* Structure describing the dynamic linker itself. */ -extern struct link_map _dl_rtld_map; -/* And a pointer to the map for the main map. */ -extern struct link_map *_dl_loaded; -/* Number of object in the _dl_loaded list. */ -extern unsigned int _dl_nloaded; -/* Array representing global scope. */ -extern struct r_scope_elem *_dl_global_scope[2]; -/* Direct pointer to the searchlist of the main object. */ -extern struct r_scope_elem *_dl_main_searchlist; -/* Copy of the content of `_dl_main_searchlist'. */ -extern struct r_scope_elem _dl_initial_searchlist; -/* This is zero at program start to signal that the global scope map is - allocated by rtld. Later it keeps the size of the map. It might be - reset if in _dl_close if the last global object is removed. */ -extern size_t _dl_global_scope_alloc; - -/* Allocate a `struct link_map' for a new object being loaded, - and enter it into the _dl_main_map list. */ -extern struct link_map *_dl_new_object (char *realname, const char *libname, - int type, struct link_map *loader) - internal_function; - -/* Relocate the given object (if it hasn't already been). - SCOPE is passed to _dl_lookup_symbol in symbol lookups. - If LAZY is nonzero, don't relocate its PLT. */ -extern void _dl_relocate_object (struct link_map *map, - struct r_scope_elem *scope[], - int lazy, int consider_profiling); - -/* Call _dl_signal_error with a message about an unhandled reloc type. - TYPE is the result of ELFW(R_TYPE) (r_info), i.e. an R_<CPU>_* value. - PLT is nonzero if this was a PLT reloc; it just affects the message. */ -extern void _dl_reloc_bad_type (struct link_map *map, - unsigned int type, int plt) - internal_function __attribute__ ((__noreturn__)); - -/* Check the version dependencies of all objects available through - MAP. If VERBOSE print some more diagnostics. */ -extern int _dl_check_all_versions (struct link_map *map, int verbose, - int trace_mode) - internal_function; - -/* Check the version dependencies for MAP. If VERBOSE print some more - diagnostics. */ -extern int _dl_check_map_versions (struct link_map *map, int verbose, - int trace_mode) - internal_function; - -/* Initialize the object in SCOPE by calling the constructors with - ARGC, ARGV, and ENV as the parameters. */ -extern void _dl_init (struct link_map *main_map, int argc, char **argv, - char **env) internal_function; - -/* Call the finalizer functions of all shared objects whose - initializer functions have completed. */ -extern void _dl_fini (void) internal_function; - -/* The dynamic linker calls this function before and having changing - any shared object mappings. The `r_state' member of `struct r_debug' - says what change is taking place. This function's address is - the value of the `r_brk' member. */ -extern void _dl_debug_state (void); - -/* Initialize `struct r_debug' if it has not already been done. The - argument is the run-time load address of the dynamic linker, to be put - in the `r_ldbase' member. Returns the address of the structure. */ -extern struct r_debug *_dl_debug_initialize (ElfW(Addr) ldbase) - internal_function; - -/* Initialize the basic data structure for the search paths. */ -extern void _dl_init_paths (const char *library_path) internal_function; - -/* Gather the information needed to install the profiling tables and start - the timers. */ -extern void _dl_start_profile (struct link_map *map, const char *output_dir) - internal_function; - -/* The actual functions used to keep book on the calls. */ -extern void _dl_mcount (ElfW(Addr) frompc, ElfW(Addr) selfpc); - -/* This function is simply a wrapper around the _dl_mcount function - which does not require a FROMPC parameter since this is the - calling function. */ -extern void _dl_mcount_wrapper (void *selfpc); - -/* Show the members of the auxiliary array passed up from the kernel. */ -extern void _dl_show_auxv (void) internal_function; - -/* Return all environment variables starting with `LD_', one after the - other. */ -extern char *_dl_next_ld_env_entry (char ***position) internal_function; - -/* Return an array with the names of the important hardware capabilities. */ -extern const struct r_strlenpair *_dl_important_hwcaps (const char *platform, - size_t paltform_len, - size_t *sz, - size_t *max_capstrlen) - internal_function; - -/* Look up NAME in ld.so.cache and return the file name stored there, - or null if none is found. */ -extern const char *_dl_load_cache_lookup (const char *name) - internal_function; - -/* If the system does not support MAP_COPY we cannot leave the file open - all the time since this would create problems when the file is replaced. - Therefore we provide this function to close the file and open it again - once needed. */ -extern void _dl_unload_cache (void); - -/* System-dependent function to read a file's whole contents in the - most convenient manner available. *SIZEP gets the size of the - file. On error MAP_FAILED is returned. */ -extern void *_dl_sysdep_read_whole_file (const char *file, size_t *sizep, - int prot) - internal_function; - -/* 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 __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 ElfW(Addr) _dl_sysdep_start (void **start_argptr, - void (*dl_main) (const ElfW(Phdr) *phdr, - ElfW(Word) phnum, - ElfW(Addr) *user_entry)); - -extern void _dl_sysdep_start_cleanup (void) - internal_function; - - -__END_DECLS - -#endif /* ldsodefs.h */ |