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authorUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
committerUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
commita334319f6530564d22e775935d9c91663623a1b4 (patch)
treeb5877475619e4c938e98757d518bb1e9cbead751 /include/link.h
parent0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (diff)
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(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.
Diffstat (limited to 'include/link.h')
-rw-r--r--include/link.h149
1 files changed, 78 insertions, 71 deletions
diff --git a/include/link.h b/include/link.h
index 9311256..3078b72 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) 1995-2006, 2007 Free Software Foundation, Inc.
+ Copyright (C) 1995-2002, 2003, 2004 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
@@ -18,32 +18,65 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
-#ifndef _PRIVATE_LINK_H
-#define _PRIVATE_LINK_H 1
+#ifndef _LINK_H
+#define _LINK_H 1
-#ifdef _LINK_H
-# error this should be impossible
-#endif
+#include <elf.h>
+#include <dlfcn.h>
+#include <stddef.h>
+#include <sys/types.h>
-/* 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
+/* 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
-struct link_map;
-extern unsigned int la_objopen (struct link_map *__map, Lmid_t __lmid,
- uintptr_t *__cookie);
+#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. */
-#include <stddef.h>
-#include <bits/linkmap.h>
-#include <dl-lookupcfg.h>
-#include <tls.h>
-#include <bits/libc-lock.h>
+struct r_debug
+ {
+ int r_version; /* Version number for this protocol. */
+
+ struct link_map *r_map; /* Head of the chain of loaded objects. */
+
+ /* 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. */
+ };
+
+/* 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[];
/* Some internal data structures of the dynamic linker used in the
@@ -125,7 +158,7 @@ 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
@@ -142,20 +175,9 @@ struct link_map
/* Symbol hash table. */
Elf_Symndx l_nbuckets;
- 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;
- };
+ const Elf_Symndx *l_buckets, *l_chain;
+ 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. */
{
@@ -177,15 +199,6 @@ 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;
@@ -194,14 +207,7 @@ struct link_map
struct r_search_path_struct l_rpath_dirs;
/* Collected results of relocation while profiling. */
- struct reloc_result
- {
- DL_FIXUP_VALUE_TYPE addr;
- struct link_map *bound;
- unsigned int boundndx;
- uint32_t enterexit;
- unsigned int flags;
- } *l_reloc_result;
+ ElfW(Addr) *l_reloc_result;
/* Pointer to the version information if available. */
ElfW(Versym) *l_versyms;
@@ -220,7 +226,7 @@ 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 initially at most three different scope lists. */
+ There are at most three different scope lists. */
struct r_scope_elem **l_scope;
/* A similar array, this time only with the local scope. This is
@@ -249,7 +255,7 @@ struct link_map
ElfW(Word) l_flags;
/* Temporarily used in `dl_close'. */
- int l_idx;
+ unsigned int l_idx;
struct link_map_machine l_mach;
@@ -257,7 +263,11 @@ 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;
@@ -287,27 +297,24 @@ 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;
-#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
+ unsigned long long int dlpi_adds;
+ unsigned long long int dlpi_subs;
+ };
+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 /* include/link.h */
+#endif /* link.h */