1/*-
2 * Copyright (c) 1999, 2000 John D. Polstra.
3 * Copyright (c) 2014 the FreeBSD Foundation
4 * All rights reserved.
5 *
6 * Portions of this software were developed by Andrew Turner
7 * under sponsorship from the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $FreeBSD$
31 */
32
33#ifndef RTLD_MACHDEP_H
34#define	RTLD_MACHDEP_H	1
35
36#include <sys/types.h>
37#include <machine/atomic.h>
38
39struct Struct_Obj_Entry;
40
41/* Return the address of the .dynamic section in the dynamic linker. */
42#define	rtld_dynamic(obj)						\
43({									\
44	Elf_Addr _dynamic_addr;						\
45	asm volatile("adr	%0, _DYNAMIC" : "=&r"(_dynamic_addr));	\
46	(const Elf_Dyn *)_dynamic_addr;					\
47})
48
49Elf_Addr reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
50    const struct Struct_Obj_Entry *defobj, const struct Struct_Obj_Entry *obj,
51    const Elf_Rel *rel);
52
53#define	make_function_pointer(def, defobj) \
54	((defobj)->relocbase + (def)->st_value)
55
56#define	call_initfini_pointer(obj, target) \
57	(((InitFunc)(target))())
58
59#define	call_init_pointer(obj, target) \
60	(((InitArrFunc)(target))(main_argc, main_argv, environ))
61
62/*
63 * Pass zeros into the ifunc resolver so we can change them later. The first
64 * 8 arguments on arm64 are passed in registers so make them known values
65 * if we decide to use them later. Because of this ifunc resolvers can assume
66 * no arguments are passeed in, and if this changes later will be able to
67 * compare the argument with 0 to see if it is set.
68 */
69#define	call_ifunc_resolver(ptr) \
70	(((Elf_Addr (*)(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t, \
71	    uint64_t, uint64_t, uint64_t))ptr)(0, 0, 0, 0, 0, 0, 0, 0))
72
73#define	round(size, align)				\
74	(((size) + (align) - 1) & ~((align) - 1))
75#define	calculate_first_tls_offset(size, align, offset)	\
76	round(16, align)
77#define	calculate_tls_offset(prev_offset, prev_size, size, align, offset) \
78	round(prev_offset + prev_size, align)
79#define	calculate_tls_end(off, size) 	((off) + (size))
80#define calculate_tls_post_size(align) \
81	round(TLS_TCB_SIZE, align) - TLS_TCB_SIZE
82
83#define	TLS_TCB_SIZE	16
84typedef struct {
85    unsigned long ti_module;
86    unsigned long ti_offset;
87} tls_index;
88
89extern void *__tls_get_addr(tls_index *ti);
90
91#define	RTLD_DEFAULT_STACK_PF_EXEC	PF_X
92#define	RTLD_DEFAULT_STACK_EXEC		PROT_EXEC
93
94#define md_abi_variant_hook(x)
95
96#define	TLS_DTV_OFFSET	0
97
98#endif
99