1 /* $NetBSD: kobj_machdep.c,v 1.6 2023/04/29 10:01:51 skrll Exp $ */
2
3 /*-
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: kobj_machdep.c,v 1.6 2023/04/29 10:01:51 skrll Exp $");
31
32 #define ELFSIZE ARCH_ELFSIZE
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kobj.h>
37 #include <sys/exec.h>
38 #include <sys/exec_elf.h>
39
40 int
kobj_reloc(kobj_t ko,uintptr_t relocbase,const void * data,bool isrela,bool local)41 kobj_reloc(kobj_t ko, uintptr_t relocbase, const void *data,
42 bool isrela, bool local)
43 {
44 Elf_Addr *where;
45 uintptr_t addr, tmp;
46 int rtype, symnum;
47 const Elf_Rela *rela;
48 int error;
49
50 if (!isrela) {
51 printf("kobj_reloc: support only RELA relocations\n");
52 return -1;
53 }
54
55 rela = data;
56 where = (Elf_Addr *)(relocbase + rela->r_offset);
57 symnum = ELF_R_SYM(rela->r_info);
58 rtype = ELF_R_TYPE(rela->r_info);
59
60 const Elf_Sym *sym = kobj_symbol(ko, symnum);
61
62 if (!local && ELF_ST_BIND(sym->st_info) == STB_LOCAL) {
63 return 0;
64 }
65
66 switch (rtype) {
67 case R_TYPE(NONE):
68 break;
69
70 case R_TYPE(PC32):
71 error = kobj_sym_lookup(ko, symnum, &addr);
72 if (error)
73 return -1;
74 tmp = (Elf_Addr)(addr + rela->r_addend) - (Elf_Addr)where;
75 if (*where != tmp)
76 *where = tmp;
77 break;
78
79 case R_TYPE(32):
80 case R_TYPE(GLOB_DAT):
81 error = kobj_sym_lookup(ko, symnum, &addr);
82 if (error)
83 return -1;
84 tmp = (Elf_Addr)(addr + *where + rela->r_addend);
85 *where = tmp;
86 break;
87
88 case R_TYPE(RELATIVE):
89 *where += (Elf_Addr)(relocbase + rela->r_addend);
90 break;
91
92 default:
93 printf("kobj_reloc: unexpected relocation type %d\n",
94 (int)rtype);
95 return -1;
96 }
97
98 return 0;
99 }
100
101 int
kobj_machdep(kobj_t ko,void * base,size_t size,bool load)102 kobj_machdep(kobj_t ko, void *base, size_t size, bool load)
103 {
104
105 return 0;
106 }
107