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1 /* Do relocations for ELF dynamic linking.
2 Copyright (C) 1995-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
21 /* This file may be included twice, to define both
22 `elf_dynamic_do_rel' and `elf_dynamic_do_rela'. */
25 # define elf_dynamic_do_Rel elf_dynamic_do_Rela
27 # define elf_machine_rel elf_machine_rela
28 # define elf_machine_rel_relative elf_machine_rela_relative
31 #ifndef DO_ELF_MACHINE_REL_RELATIVE
32 # define DO_ELF_MACHINE_REL_RELATIVE(map, l_addr, relative) \
33 elf_machine_rel_relative (l_addr, relative, \
34 (void *) (l_addr + relative->r_offset))
37 /* Perform the relocations in MAP on the running program image as specified
38 by RELTAG, SZTAG. If LAZY is nonzero, this is the first pass on PLT
39 relocations; they should be set up to call _dl_runtime_resolve, rather
40 than fully resolved now. */
42 static inline void __attribute__ ((always_inline
))
43 elf_dynamic_do_Rel (struct link_map
*map
, struct r_scope_elem
*scope
[],
44 ElfW(Addr
) reladdr
, ElfW(Addr
) relsize
,
45 __typeof (((ElfW(Dyn
) *) 0)->d_un
.d_val
) nrelative
,
46 int lazy
, int skip_ifunc
)
48 const ElfW(Rel
) *relative
= (const void *) reladdr
;
49 const ElfW(Rel
) *r
= relative
+ nrelative
;
50 const ElfW(Rel
) *end
= (const void *) (reladdr
+ relsize
);
51 ElfW(Addr
) l_addr
= map
->l_addr
;
52 const ElfW(Sym
) *const symtab
53 = (const void *) D_PTR (map
, l_info
[DT_SYMTAB
]);
56 for (; relative
< r
; ++relative
)
57 DO_ELF_MACHINE_REL_RELATIVE (map
, l_addr
, relative
);
59 const ElfW (Half
) *const version
60 = (const void *) D_PTR (map
, l_info
[VERSYMIDX (DT_VERSYM
)]);
63 ElfW (Half
) ndx
= version
[ELFW (R_SYM
) (r
->r_info
)] & 0x7fff;
64 const ElfW (Sym
) *sym
= &symtab
[ELFW (R_SYM
) (r
->r_info
)];
65 void *const r_addr_arg
= (void *) (l_addr
+ r
->r_offset
);
66 const struct r_found_version
*rversion
= &map
->l_versions
[ndx
];
68 elf_machine_rel (map
, scope
, r
, sym
, rversion
, r_addr_arg
, skip_ifunc
);
70 #else /* !RTLD_BOOTSTRAP */
71 # if defined ELF_MACHINE_IRELATIVE
72 const ElfW(Rel
) *r2
= NULL
;
73 const ElfW(Rel
) *end2
= NULL
;
76 #if !defined DO_RELA || !defined ELF_MACHINE_PLT_REL
77 /* We never bind lazily during ld.so bootstrap. Unfortunately gcc is
78 not clever enough to see through all the function calls to realize
82 /* Doing lazy PLT relocations; they need very little info. */
84 # ifdef ELF_MACHINE_IRELATIVE
85 if (ELFW(R_TYPE
) (r
->r_info
) == ELF_MACHINE_IRELATIVE
)
93 elf_machine_lazy_rel (map
, scope
, l_addr
, r
, skip_ifunc
);
95 # ifdef ELF_MACHINE_IRELATIVE
97 for (; r2
<= end2
; ++r2
)
98 if (ELFW(R_TYPE
) (r2
->r_info
) == ELF_MACHINE_IRELATIVE
)
99 elf_machine_lazy_rel (map
, scope
, l_addr
, r2
, skip_ifunc
);
105 /* This is defined in rtld.c, but nowhere in the static libc.a; make
106 the reference weak so static programs can still link. This
107 declaration cannot be done when compiling rtld.c (i.e. #ifdef
108 RTLD_BOOTSTRAP) because rtld.c contains the common defn for
109 _dl_rtld_map, which is incompatible with a weak decl in the same
112 weak_extern (GL(dl_rtld_map
));
114 if (map
!= &GL(dl_rtld_map
)) /* Already done in rtld itself. */
115 # if !defined DO_RELA || defined ELF_MACHINE_REL_RELATIVE
116 /* Rela platforms get the offset from r_addend and this must
117 be copied in the relocation address. Therefore we can skip
118 the relative relocations only if this is for rel
119 relocations or rela relocations if they are computed as
120 memory_loc += l_addr... */
123 for (; relative
< r
; ++relative
)
124 DO_ELF_MACHINE_REL_RELATIVE (map
, l_addr
, relative
);
126 if (map
->l_info
[VERSYMIDX (DT_VERSYM
)])
128 const ElfW(Half
) *const version
=
129 (const void *) D_PTR (map
, l_info
[VERSYMIDX (DT_VERSYM
)]);
133 ElfW(Half
) ndx
= version
[ELFW(R_SYM
) (r
->r_info
)] & 0x7fff;
134 const ElfW(Sym
) *sym
= &symtab
[ELFW(R_SYM
) (r
->r_info
)];
135 void *const r_addr_arg
= (void *) (l_addr
+ r
->r_offset
);
136 const struct r_found_version
*rversion
= &map
->l_versions
[ndx
];
137 #if defined ELF_MACHINE_IRELATIVE
138 if (ELFW(R_TYPE
) (r
->r_info
) == ELF_MACHINE_IRELATIVE
)
147 elf_machine_rel (map
, scope
, r
, sym
, rversion
, r_addr_arg
,
150 if (ELFW(R_TYPE
) (r
->r_info
) == ELF_MACHINE_JMP_SLOT
151 && GLRO(dl_naudit
) > 0)
153 struct link_map
*sym_map
154 = RESOLVE_MAP (map
, scope
, &sym
, rversion
,
155 ELF_MACHINE_JMP_SLOT
);
157 _dl_audit_symbind (map
, NULL
, r
, sym
, r_addr_arg
, sym_map
,
163 #if defined ELF_MACHINE_IRELATIVE
165 for (; r2
<= end2
; ++r2
)
166 if (ELFW(R_TYPE
) (r2
->r_info
) == ELF_MACHINE_IRELATIVE
)
169 = version
[ELFW(R_SYM
) (r2
->r_info
)] & 0x7fff;
170 elf_machine_rel (map
, scope
, r2
,
171 &symtab
[ELFW(R_SYM
) (r2
->r_info
)],
172 &map
->l_versions
[ndx
],
173 (void *) (l_addr
+ r2
->r_offset
),
182 const ElfW(Sym
) *sym
= &symtab
[ELFW(R_SYM
) (r
->r_info
)];
183 void *const r_addr_arg
= (void *) (l_addr
+ r
->r_offset
);
184 # ifdef ELF_MACHINE_IRELATIVE
185 if (ELFW(R_TYPE
) (r
->r_info
) == ELF_MACHINE_IRELATIVE
)
193 elf_machine_rel (map
, scope
, r
, sym
, NULL
, r_addr_arg
,
196 if (ELFW(R_TYPE
) (r
->r_info
) == ELF_MACHINE_JMP_SLOT
197 && GLRO(dl_naudit
) > 0)
199 struct link_map
*sym_map
200 = RESOLVE_MAP (map
, scope
, &sym
,
201 (struct r_found_version
*) NULL
,
202 ELF_MACHINE_JMP_SLOT
);
204 _dl_audit_symbind (map
, NULL
, r
, sym
,r_addr_arg
, sym_map
,
210 # ifdef ELF_MACHINE_IRELATIVE
212 for (; r2
<= end2
; ++r2
)
213 if (ELFW(R_TYPE
) (r2
->r_info
) == ELF_MACHINE_IRELATIVE
)
214 elf_machine_rel (map
, scope
, r2
, &symtab
[ELFW(R_SYM
) (r2
->r_info
)],
215 NULL
, (void *) (l_addr
+ r2
->r_offset
),
220 #endif /* !RTLD_BOOTSTRAP */
223 #undef elf_dynamic_do_Rel
225 #undef elf_machine_rel
226 #undef elf_machine_rel_relative
227 #undef DO_ELF_MACHINE_REL_RELATIVE
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