rtld_machdep.h revision 309061 
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: stable/10/libexec/rtld-elf/amd64/rtld_machdep.h 309061 2016-11-23 17:48:43Z kib $
27 */
28
29#ifndef RTLD_MACHDEP_H
30#define RTLD_MACHDEP_H	1
31
32#include <sys/types.h>
33#include <machine/atomic.h>
34
35struct Struct_Obj_Entry;
36
37/* Return the address of the .dynamic section in the dynamic linker. */
38#define rtld_dynamic(obj) \
39    ((const Elf_Dyn *)((obj)->relocbase + (Elf_Addr)&_DYNAMIC))
40
41/* Fixup the jump slot at "where" to transfer control to "target". */
42static inline Elf_Addr
43reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
44	      const struct Struct_Obj_Entry *obj,
45	      const struct Struct_Obj_Entry *refobj, const Elf_Rel *rel)
46{
47#ifdef dbg
48    dbg("reloc_jmpslot: *%p = %p", (void *)(where),
49	(void *)(target));
50#endif
51    (*(Elf_Addr *)(where) = (Elf_Addr)(target));
52    return target;
53}
54
55#define make_function_pointer(def, defobj) \
56	((defobj)->relocbase + (def)->st_value)
57
58#define call_initfini_pointer(obj, target) \
59	(((InitFunc)(target))())
60
61#define call_init_pointer(obj, target) \
62	(((InitArrFunc)(target))(main_argc, main_argv, environ))
63
64extern uint32_t cpu_feature;
65extern uint32_t cpu_feature2;
66extern uint32_t cpu_stdext_feature;
67extern uint32_t cpu_stdext_feature2;
68#define	call_ifunc_resolver(ptr) \
69	(((Elf_Addr (*)(uint32_t, uint32_t, uint32_t, uint32_t))ptr)( \
70	    cpu_feature, cpu_feature2, cpu_stdext_feature, cpu_stdext_feature2))
71
72#define round(size, align) \
73	(((size) + (align) - 1) & ~((align) - 1))
74#define calculate_first_tls_offset(size, align) \
75	round(size, align)
76#define calculate_tls_offset(prev_offset, prev_size, size, align) \
77	round((prev_offset) + (size), align)
78#define calculate_tls_end(off, size) 	(off)
79
80typedef struct {
81    unsigned long ti_module;
82    unsigned long ti_offset;
83} tls_index;
84
85void *__tls_get_addr(tls_index *ti) __exported;
86
87#define	RTLD_DEFAULT_STACK_PF_EXEC	PF_X
88#define	RTLD_DEFAULT_STACK_EXEC		PROT_EXEC
89
90#endif
91