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Diffstat (limited to 'elf/link.h')
| -rw-r--r-- | elf/link.h | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/elf/link.h b/elf/link.h deleted file mode 100644 index 0e223ce9f0..0000000000 --- a/elf/link.h +++ /dev/null @@ -1,194 +0,0 @@ -/* Data structure for communication from the run-time dynamic linker for - loaded ELF shared objects. - Copyright (C) 1995-2017 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, see - <http://www.gnu.org/licenses/>. */ - -#ifndef _LINK_H -#define _LINK_H 1 - -#include <features.h> -#include <elf.h> -#include <dlfcn.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> - -/* 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. */ - - 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[]; - -/* Structure describing a loaded shared object. The `l_next' and `l_prev' - members form a chain of all the shared objects loaded at startup. - - These data structures exist in space used by the run-time dynamic linker; - modifying them may have disastrous results. */ - -struct link_map - { - /* These first few members are part of the protocol with the debugger. - This is the same format used in SVR4. */ - - ElfW(Addr) l_addr; /* Difference between the address in the ELF - file and the addresses in memory. */ - char *l_name; /* Absolute file name object was found in. */ - ElfW(Dyn) *l_ld; /* Dynamic section of the shared object. */ - struct link_map *l_next, *l_prev; /* Chain of loaded objects. */ - }; - -#ifdef __USE_GNU - -/* Version numbers for la_version handshake interface. */ -#define LAV_CURRENT 1 - -/* Activity types signaled through la_activity. */ -enum - { - LA_ACT_CONSISTENT, /* Link map consistent again. */ - LA_ACT_ADD, /* New object will be added. */ - LA_ACT_DELETE /* Objects will be removed. */ - }; - -/* Values representing origin of name for dynamic loading. */ -enum - { - LA_SER_ORIG = 0x01, /* Original name. */ - LA_SER_LIBPATH = 0x02, /* Directory from LD_LIBRARY_PATH. */ - LA_SER_RUNPATH = 0x04, /* Directory from RPATH/RUNPATH. */ - LA_SER_CONFIG = 0x08, /* Found through ldconfig. */ - LA_SER_DEFAULT = 0x40, /* Default directory. */ - LA_SER_SECURE = 0x80 /* Unused. */ - }; - -/* Values for la_objopen return value. */ -enum - { - LA_FLG_BINDTO = 0x01, /* Audit symbols bound to this object. */ - LA_FLG_BINDFROM = 0x02 /* Audit symbols bound from this object. */ - }; - -/* Values for la_symbind flags parameter. */ -enum - { - LA_SYMB_NOPLTENTER = 0x01, /* la_pltenter will not be called. */ - LA_SYMB_NOPLTEXIT = 0x02, /* la_pltexit will not be called. */ - LA_SYMB_STRUCTCALL = 0x04, /* Return value is a structure. */ - LA_SYMB_DLSYM = 0x08, /* Binding due to dlsym call. */ - LA_SYMB_ALTVALUE = 0x10 /* Value has been changed by a previous - la_symbind call. */ - }; - -struct dl_phdr_info - { - ElfW(Addr) dlpi_addr; - const char *dlpi_name; - const ElfW(Phdr) *dlpi_phdr; - ElfW(Half) dlpi_phnum; - - /* Note: Following members were introduced after the first - version of this structure was available. Check the SIZE - argument passed to the dl_iterate_phdr callback to determine - whether or not each later member is available. */ - - /* Incremented when a new object may have been added. */ - __extension__ unsigned long long int dlpi_adds; - /* Incremented when an object may have been removed. */ - __extension__ unsigned long long int dlpi_subs; - - /* If there is a PT_TLS segment, its module ID as used in - TLS relocations, else zero. */ - size_t dlpi_tls_modid; - - /* The address of the calling thread's instance of this module's - PT_TLS segment, if it has one and it has been allocated - in the calling thread, otherwise a null pointer. */ - void *dlpi_tls_data; - }; - -__BEGIN_DECLS - -extern int dl_iterate_phdr (int (*__callback) (struct dl_phdr_info *, - size_t, void *), - void *__data); - - -/* Prototypes for the ld.so auditing interfaces. These are not - defined anywhere in ld.so but instead have to be provided by the - auditing DSO. */ -extern unsigned int la_version (unsigned int __version); -extern void la_activity (uintptr_t *__cookie, unsigned int __flag); -extern char *la_objsearch (const char *__name, uintptr_t *__cookie, - unsigned int __flag); -extern unsigned int la_objopen (struct link_map *__map, Lmid_t __lmid, - uintptr_t *__cookie); -extern void la_preinit (uintptr_t *__cookie); -extern uintptr_t la_symbind32 (Elf32_Sym *__sym, unsigned int __ndx, - uintptr_t *__refcook, uintptr_t *__defcook, - unsigned int *__flags, const char *__symname); -extern uintptr_t la_symbind64 (Elf64_Sym *__sym, unsigned int __ndx, - uintptr_t *__refcook, uintptr_t *__defcook, - unsigned int *__flags, const char *__symname); -extern unsigned int la_objclose (uintptr_t *__cookie); - -__END_DECLS - -#endif - -#endif /* link.h */ |