xref: /freebsd/libexec/rtld-elf/powerpc64/rtld_machdep.h (revision e32fecd0c2c3ee37c47ee100f169e7eb0282a873)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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  * $FreeBSD$
29  */
30 
31 #ifndef RTLD_MACHDEP_H
32 #define RTLD_MACHDEP_H	1
33 
34 #include <sys/types.h>
35 #include <machine/atomic.h>
36 #include <machine/tls.h>
37 
38 struct Struct_Obj_Entry;
39 
40 /* Return the address of the .dynamic section in the dynamic linker. */
41 #define rtld_dynamic(obj)    (&_DYNAMIC)
42 
43 Elf_Addr reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
44     const struct Struct_Obj_Entry *defobj, const struct Struct_Obj_Entry *obj,
45     const Elf_Rel *rel);
46 void reloc_non_plt_self(Elf_Dyn *dynp, Elf_Addr relocbase);
47 
48 #define make_function_pointer(def, defobj) \
49 	((defobj)->relocbase + (def)->st_value)
50 
51 #define call_initfini_pointer(obj, target) \
52 	(((InitFunc)(target))())
53 
54 #define call_init_pointer(obj, target) \
55 	(((InitArrFunc)(target))(main_argc, main_argv, environ))
56 
57 extern u_long cpu_features; /* r3 */
58 extern u_long cpu_features2; /* r4 */
59 /* r5-r10: ifunc resolver parameters reserved for future assignment. */
60 #define	call_ifunc_resolver(ptr) \
61 	(((Elf_Addr (*)(uint32_t, uint32_t, uint64_t, uint64_t, uint64_t, \
62            uint64_t, uint64_t, uint64_t))ptr)((uint32_t)cpu_features, \
63            (uint32_t)cpu_features2, 0, 0, 0, 0, 0, 0))
64 
65 /*
66  * TLS
67  */
68 
69 #define round(size, align) \
70     (((size) + (align) - 1) & ~((align) - 1))
71 #define calculate_first_tls_offset(size, align, offset)	\
72     TLS_TCB_SIZE
73 #define calculate_tls_offset(prev_offset, prev_size, size, align, offset) \
74     round(prev_offset + prev_size, align)
75 #define calculate_tls_post_size(align)  0
76 
77 typedef struct {
78 	unsigned long ti_module;
79 	unsigned long ti_offset;
80 } tls_index;
81 
82 extern void *__tls_get_addr(tls_index* ti);
83 
84 extern void powerpc64_abi_variant_hook(Elf_Auxinfo **);
85 #define md_abi_variant_hook(x) powerpc64_abi_variant_hook(x)
86 
87 #endif
88