rtld: Add support for preinit, init, and fini arrays
[dragonfly.git] / libexec / rtld-elf / i386 / rtld_machdep.h
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1/*-
2 * Copyright (c) 1999, 2000 John D. Polstra.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
f4f4bfd5 26 * $FreeBSD$
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27 */
28
29#ifndef RTLD_MACHDEP_H
30#define RTLD_MACHDEP_H 1
31
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32#include <sys/types.h>
33#include <machine/atomic.h>
34
35#define CACHE_LINE_SIZE 32
36
37struct Struct_Obj_Entry;
38
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39/* Return the address of the .dynamic section in the dynamic linker. */
40#define rtld_dynamic(obj) \
41 ((const Elf_Dyn *)((obj)->relocbase + (Elf_Addr)&_DYNAMIC))
42
43/* Fixup the jump slot at "where" to transfer control to "target". */
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44static inline Elf_Addr
45reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
46 const struct Struct_Obj_Entry *obj,
47 const struct Struct_Obj_Entry *refobj, const Elf_Rel *rel)
984263bc 48{
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49#ifdef dbg
50 dbg("reloc_jmpslot: *%p = %p", (void *)(where),
51 (void *)(target));
52#endif
53 (*(Elf_Addr *)(where) = (Elf_Addr)(target));
54 return target;
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55}
56
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57#define make_function_pointer(def, defobj) \
58 ((defobj)->relocbase + (def)->st_value)
984263bc 59
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60#define call_initfini_pointer(obj, target) \
61 (((InitFunc)(target))())
984263bc 62
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63#define call_array_pointer(target, argc, argv, env) \
64 (((InitArrayFunc)(target))(argc, argv, env))
65
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66#define round(size, align) \
67 (((size) + (align) - 1) & ~((align) - 1))
68#define calculate_first_tls_offset(size, align) \
69 round(size, align)
70#define calculate_tls_offset(prev_offset, prev_size, size, align) \
71 round((prev_offset) + (size), align)
72#define calculate_tls_end(off, size) (off)
73
74typedef struct {
75 unsigned long ti_module;
76 unsigned long ti_offset;
77} tls_index;
78
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79struct tls_tcb;
80
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81extern void *___tls_get_addr(tls_index *ti) __attribute__((__regparm__(1)));
82extern void *__tls_get_addr(tls_index *ti);
a1eee96a 83extern void *__tls_get_addr_tcb(struct tls_tcb *tcb, tls_index *ti);
55b88cae 84
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85#define RTLD_DEFAULT_STACK_PF_EXEC PF_X
86#define RTLD_DEFAULT_STACK_EXEC PROT_EXEC
87
984263bc 88#endif