diff options
Diffstat (limited to 'include/link.h')
| -rw-r--r-- | include/link.h | 149 |
1 files changed, 71 insertions, 78 deletions
diff --git a/include/link.h b/include/link.h index 3078b72a87..9311256aff 100644 --- a/include/link.h +++ b/include/link.h @@ -1,6 +1,6 @@ /* Data structure for communication from the run-time dynamic linker for loaded ELF shared objects. - Copyright (C) 1995-2002, 2003, 2004 Free Software Foundation, Inc. + Copyright (C) 1995-2006, 2007 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 @@ -18,65 +18,32 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ -#ifndef _LINK_H -#define _LINK_H 1 +#ifndef _PRIVATE_LINK_H +#define _PRIVATE_LINK_H 1 -#include <elf.h> -#include <dlfcn.h> -#include <stddef.h> -#include <sys/types.h> - -/* 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 _ElfW(e,w,t) _ElfW_1 (e, w, _##t) -#define _ElfW_1(e,w,t) e##w##t - -#include <bits/elfclass.h> /* Defines __ELF_NATIVE_CLASS. */ -#include <bits/link.h> -#include <dl-lookupcfg.h> -#include <tls.h> /* Defines USE_TLS. */ - -/* Rendezvous structure used by the run-time dynamic linker to communicate - details of shared object loading to the debugger. If the executable's - dynamic section has a DT_DEBUG element, the run-time linker sets that - element's value to the address where this structure can be found. */ - -struct r_debug - { - int r_version; /* Version number for this protocol. */ +#ifdef _LINK_H +# error this should be impossible +#endif - struct link_map *r_map; /* Head of the chain of loaded objects. */ +/* Get most of the contents from the public header, but we define a + different `struct link_map' type for private use. The la_objopen + prototype uses the type, so we have to declare it separately. */ +#define link_map link_map_public +#define la_objopen la_objopen_wrongproto +#include <elf/link.h> +#undef link_map +#undef la_objopen - /* This is the address of a function internal to the run-time linker, - that will always be called when the linker begins to map in a - library or unmap it, and again when the mapping change is complete. - The debugger can set a breakpoint at this address if it wants to - notice shared object mapping changes. */ - ElfW(Addr) r_brk; - enum - { - /* This state value describes the mapping change taking place when - the `r_brk' address is called. */ - RT_CONSISTENT, /* Mapping change is complete. */ - RT_ADD, /* Beginning to add a new object. */ - RT_DELETE /* Beginning to remove an object mapping. */ - } r_state; - - ElfW(Addr) r_ldbase; /* Base address the linker is loaded at. */ - }; +struct link_map; +extern unsigned int la_objopen (struct link_map *__map, Lmid_t __lmid, + uintptr_t *__cookie); -/* This is the instance of that structure used by the dynamic linker. */ -extern struct r_debug _r_debug; -/* This symbol refers to the "dynamic structure" in the `.dynamic' section - of whatever module refers to `_DYNAMIC'. So, to find its own - `struct r_debug', a program could do: - for (dyn = _DYNAMIC; dyn->d_tag != DT_NULL; ++dyn) - if (dyn->d_tag == DT_DEBUG) - r_debug = (struct r_debug *) dyn->d_un.d_ptr; - */ -extern ElfW(Dyn) _DYNAMIC[]; +#include <stddef.h> +#include <bits/linkmap.h> +#include <dl-lookupcfg.h> +#include <tls.h> +#include <bits/libc-lock.h> /* Some internal data structures of the dynamic linker used in the @@ -158,7 +125,7 @@ struct link_map const ElfW(Phdr) *l_phdr; /* Pointer to program header table in core. */ ElfW(Addr) l_entry; /* Entry point location. */ ElfW(Half) l_phnum; /* Number of program header entries. */ - ElfW(Half) l_ldnum; /* Number of dynamic segment entries. */ + ElfW(Half) l_ldnum; /* Number of dynamic segment entries. */ /* Array of DT_NEEDED dependencies and their dependencies, in dependency order for symbol lookup (with and without @@ -175,9 +142,20 @@ struct link_map /* Symbol hash table. */ Elf_Symndx l_nbuckets; - const Elf_Symndx *l_buckets, *l_chain; + Elf32_Word l_gnu_bitmask_idxbits; + Elf32_Word l_gnu_shift; + const ElfW(Addr) *l_gnu_bitmask; + union + { + const Elf32_Word *l_gnu_buckets; + const Elf_Symndx *l_chain; + }; + union + { + const Elf32_Word *l_gnu_chain_zero; + const Elf_Symndx *l_buckets; + }; - unsigned int l_opencount; /* Counter for direct and indirect usage. */ unsigned int l_direct_opencount; /* Reference count for dlopen/dlclose. */ enum /* Where this object came from. */ { @@ -199,6 +177,15 @@ struct link_map should be called on this link map when relocation finishes. */ unsigned int l_used:1; /* Nonzero if the DSO is used. */ + unsigned int l_auditing:1; /* Nonzero if the DSO is used in auditing. */ + unsigned int l_audit_any_plt:1; /* Nonzero if at least one audit module + is interested in the PLT interception.*/ + unsigned int l_removed:1; /* Nozero if the object cannot be used anymore + since it is removed. */ + unsigned int l_contiguous:1; /* Nonzero if inter-segment holes are + mprotected or if no holes are present at + all. */ + /* Array with version names. */ unsigned int l_nversions; struct r_found_version *l_versions; @@ -207,7 +194,14 @@ struct link_map struct r_search_path_struct l_rpath_dirs; /* Collected results of relocation while profiling. */ - ElfW(Addr) *l_reloc_result; + struct reloc_result + { + DL_FIXUP_VALUE_TYPE addr; + struct link_map *bound; + unsigned int boundndx; + uint32_t enterexit; + unsigned int flags; + } *l_reloc_result; /* Pointer to the version information if available. */ ElfW(Versym) *l_versyms; @@ -226,7 +220,7 @@ struct link_map /* Size of array allocated for 'l_scope'. */ size_t l_scope_max; /* This is an array defining the lookup scope for this link map. - There are at most three different scope lists. */ + There are initially at most three different scope lists. */ struct r_scope_elem **l_scope; /* A similar array, this time only with the local scope. This is @@ -255,7 +249,7 @@ struct link_map ElfW(Word) l_flags; /* Temporarily used in `dl_close'. */ - unsigned int l_idx; + int l_idx; struct link_map_machine l_mach; @@ -263,11 +257,7 @@ struct link_map { const ElfW(Sym) *sym; int type_class; -#ifdef DL_LOOKUP_RETURNS_MAP struct link_map *value; -#else - ElfW(Addr) value; -#endif const ElfW(Sym) *ret; } l_lookup_cache; @@ -297,24 +287,27 @@ struct link_map done. */ ElfW(Addr) l_relro_addr; size_t l_relro_size; + + /* Audit information. This array apparent must be the last in the + structure. Never add something after it. */ + struct auditstate + { + uintptr_t cookie; + unsigned int bindflags; + } l_audit[0]; }; -struct dl_phdr_info - { - ElfW(Addr) dlpi_addr; - const char *dlpi_name; - const ElfW(Phdr) *dlpi_phdr; - ElfW(Half) dlpi_phnum; - unsigned long long int dlpi_adds; - unsigned long long int dlpi_subs; - }; +#if __ELF_NATIVE_CLASS == 32 +# define symbind symbind32 +#elif __ELF_NATIVE_CLASS == 64 +# define symbind symbind64 +#else +# error "__ELF_NATIVE_CLASS must be defined" +#endif -extern int dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info, - size_t size, void *data), - void *data); extern int __dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info, size_t size, void *data), void *data); -#endif /* link.h */ +#endif /* include/link.h */ |