1 /*-
2 * Copyright (c) 2003 Jake Burkholder.
3 * Copyright 1996-1998 John D. Polstra.
4 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * Copyright (c) 1998 Peter Wemm <peter@freebsd.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: src/sys/boot/common/reloc_elf.c,v 1.2 2005/12/18 04:52:35 marcel Exp $");
32
33 #include <sys/types.h>
34 #include <machine/elf.h>
35
36 #include <errno.h>
37 #include <stand.h>
38
39 #define FREEBSD_ELF
40 #include <link.h>
41
42 #include "bootstrap.h"
43
44 #define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l)
45
46 /*
47 * Apply a single intra-module relocation to the data. `relbase' is the
48 * target relocation base for the section (i.e. it corresponds to where
49 * r_offset == 0). `dataaddr' is the relocated address corresponding to
50 * the start of the data, and `len' is the number of bytes.
51 */
52 int
53 __elfN(reloc)(struct elf_file *ef, symaddr_fn *symaddr, const void *reldata,
54 int reltype, Elf_Addr relbase, Elf_Addr dataaddr, void *data, size_t len)
55 {
56 #ifdef __sparc__
57 Elf_Size w;
58 const Elf_Rela *a;
59
60 switch (reltype) {
61 case ELF_RELOC_RELA:
62 a = reldata;
63 if (relbase + a->r_offset >= dataaddr &&
64 relbase + a->r_offset < dataaddr + len) {
65 switch (ELF_R_TYPE(a->r_info)) {
66 case R_SPARC_RELATIVE:
67 w = relbase + a->r_addend;
68 bcopy(&w, (u_char *)data + (relbase +
69 a->r_offset - dataaddr), sizeof(w));
70 break;
71 default:
72 printf("\nunhandled relocation type %u\n",
73 (u_int)ELF_R_TYPE(a->r_info));
74 return (EFTYPE);
75 }
76 }
77 break;
78 }
79
80 return (0);
81 #elif defined(__i386__) && __ELF_WORD_SIZE == 64
82 Elf64_Addr *where, val;
83 Elf_Addr addend, addr;
84 Elf_Size rtype, symidx;
85 const Elf_Rel *rel;
86 const Elf_Rela *rela;
87
88 switch (reltype) {
89 case ELF_RELOC_REL:
90 rel = (const Elf_Rel *)reldata;
91 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset -
92 dataaddr);
93 addend = 0;
94 rtype = ELF_R_TYPE(rel->r_info);
95 symidx = ELF_R_SYM(rel->r_info);
96 addend = 0;
97 break;
98 case ELF_RELOC_RELA:
99 rela = (const Elf_Rela *)reldata;
100 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset -
101 dataaddr);
102 addend = rela->r_addend;
103 rtype = ELF_R_TYPE(rela->r_info);
104 symidx = ELF_R_SYM(rela->r_info);
105 break;
106 default:
107 return (EINVAL);
108 }
109
110 if ((char *)where < (char *)data || (char *)where >= (char *)data + len)
111 return (0);
112
113 if (reltype == ELF_RELOC_REL)
114 addend = *where;
115
116 /* XXX, definitions not available on i386. */
117 #define R_X86_64_64 1
118 #define R_X86_64_RELATIVE 8
119
120 switch (rtype) {
121 case R_X86_64_64: /* S + A */
122 addr = symaddr(ef, symidx);
123 if (addr == 0)
124 return (ESRCH);
125 val = addr + addend;
126 *where = val;
127 break;
128 case R_X86_64_RELATIVE:
129 addr = (Elf_Addr)addend + relbase;
130 val = addr;
131 *where = val;
132 break;
133 default:
134 printf("\nunhandled relocation type %u\n", (u_int)rtype);
135 return (EFTYPE);
136 }
137
138 return (0);
139 #elif defined(__i386__) && __ELF_WORD_SIZE == 32
140 Elf_Addr addend, addr, *where, val;
141 Elf_Size rtype, symidx;
142 const Elf_Rel *rel;
143 const Elf_Rela *rela;
144
145 switch (reltype) {
146 case ELF_RELOC_REL:
147 rel = (const Elf_Rel *)reldata;
148 where = (Elf_Addr *)((char *)data + relbase + rel->r_offset -
149 dataaddr);
150 addend = 0;
151 rtype = ELF_R_TYPE(rel->r_info);
152 symidx = ELF_R_SYM(rel->r_info);
153 addend = 0;
154 break;
155 case ELF_RELOC_RELA:
156 rela = (const Elf_Rela *)reldata;
157 where = (Elf_Addr *)((char *)data + relbase + rela->r_offset -
158 dataaddr);
159 addend = rela->r_addend;
160 rtype = ELF_R_TYPE(rela->r_info);
161 symidx = ELF_R_SYM(rela->r_info);
162 break;
163 default:
164 return (EINVAL);
165 }
166
167 if ((char *)where < (char *)data || (char *)where >= (char *)data + len)
168 return (0);
169
170 if (reltype == ELF_RELOC_REL)
171 addend = *where;
172
173 /* XXX, definitions not available on amd64. */
174 #define R_386_32 1 /* Add symbol value. */
175 #define R_386_GLOB_DAT 6 /* Set GOT entry to data address. */
176 #define R_386_RELATIVE 8 /* Add load address of shared object. */
177
178 switch (rtype) {
179 case R_386_RELATIVE:
180 addr = addend + relbase;
181 *where = addr;
182 break;
183 case R_386_32: /* S + A */
184 addr = symaddr(ef, symidx);
185 if (addr == 0)
186 return (ESRCH);
187 val = addr + addend;
188 *where = val;
189 break;
190 default:
191 printf("\nunhandled relocation type %u\n", (u_int)rtype);
192 return (EFTYPE);
193 }
194
195 return (0);
196 #else
197 return (EOPNOTSUPP);
198 #endif
199 }
200 Cache object: 568c173757ffddcb6e3a9044e1c9df06
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