xref: /freebsd/libexec/rtld-elf/amd64/rtld_machdep.h (revision c57c26179033f64c2011a2d2a904ee3fa62e826a)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 1999, 2000 John D. Polstra.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
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 #include <machine/tls.h>
35 
36 struct Struct_Obj_Entry;
37 
38 #define	MD_OBJ_ENTRY
39 
40 /* Return the address of the .dynamic section in the dynamic linker. */
41 Elf_Dyn *rtld_dynamic_addr(void);
42 #define	rtld_dynamic(obj)	rtld_dynamic_addr()
43 
44 /* No arch-specific dynamic tags */
45 #define	arch_digest_dynamic(obj, dynp)	false
46 
47 /* No architecture specific notes */
48 #define	arch_digest_note(obj, note)	false
49 
50 Elf_Addr reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
51     const struct Struct_Obj_Entry *obj, const struct Struct_Obj_Entry *refobj,
52     const Elf_Rel *rel);
53 
54 #define make_function_pointer(def, defobj)	\
55 	((defobj)->relocbase + (def)->st_value)
56 
57 #define call_initfini_pointer(obj, target) \
58 	(((InitFunc)(target))())
59 
60 #define call_init_pointer(obj, target) \
61 	(((InitArrFunc)(target))(main_argc, main_argv, environ))
62 
63 extern uint32_t cpu_feature;
64 extern uint32_t cpu_feature2;
65 extern uint32_t cpu_stdext_feature;
66 extern uint32_t cpu_stdext_feature2;
67 #define	call_ifunc_resolver(ptr) \
68 	(((Elf_Addr (*)(uint32_t, uint32_t, uint32_t, uint32_t))ptr)( \
69 	    cpu_feature, cpu_feature2, cpu_stdext_feature, cpu_stdext_feature2))
70 
71 typedef struct {
72     unsigned long ti_module;
73     unsigned long ti_offset;
74 } tls_index;
75 
76 void *__tls_get_addr(tls_index *ti) __exported;
77 
78 #define md_abi_variant_hook(x)
79 
80 size_t calculate_first_tls_offset(size_t size, size_t align, size_t offset);
81 size_t calculate_tls_offset(size_t prev_offset, size_t prev_size, size_t size,
82     size_t align, size_t offset);
83 #endif
84