rtld_machdep.h revision 85677 
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 *
26 * $FreeBSD: head/libexec/rtld-elf/amd64/rtld_machdep.h 85677 2001-10-29 10:10:10Z peter $
27 */
28
29#ifndef RTLD_MACHDEP_H
30#define RTLD_MACHDEP_H	1
31
32struct Struct_Obj_Entry;
33
34/* Return the address of the .dynamic section in the dynamic linker. */
35#define rtld_dynamic(obj) \
36    ((const Elf_Dyn *)((obj)->relocbase + (Elf_Addr)&_DYNAMIC))
37
38/* Fixup the jump slot at "where" to transfer control to "target". */
39static inline Elf_Addr
40reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
41	      const struct Struct_Obj_Entry *obj)
42{
43    dbg("reloc_jmpslot: *%p = %p", (void *)(where),
44	(void *)(target));
45    (*(Elf_Addr *)(where) = (Elf_Addr)(target));
46    return target;
47}
48
49#define make_function_pointer(def, defobj) \
50	((defobj)->relocbase + (def)->st_value)
51
52#define call_initfini_pointer(obj, target) \
53	(((InitFunc)(target))())
54
55static inline void
56atomic_decr_int(volatile int *p)
57{
58    __asm __volatile ("lock; decl %0" : "=m"(*p) : "0"(*p) : "cc");
59}
60
61static inline void
62atomic_incr_int(volatile int *p)
63{
64    __asm __volatile ("lock; incl %0" : "=m"(*p) : "0"(*p) : "cc");
65}
66
67static inline void
68atomic_add_int(volatile int *p, int val)
69{
70    __asm __volatile ("lock; addl %1, %0"
71	: "=m"(*p)
72	: "ri"(val), "0"(*p)
73	: "cc");
74}
75
76#endif
77