1 /*-
2 * Copyright 1996-1998 John D. Polstra.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * $FreeBSD: releng/5.1/sys/i386/i386/elf_machdep.c 109605 2003-01-21 02:42:44Z jake $
26 */
27
28 #include <sys/param.h>
29 #include <sys/kernel.h>
30 #include <sys/systm.h>
31 #include <sys/exec.h>
32 #include <sys/imgact.h>
33 #include <sys/linker.h>
34 #include <sys/sysent.h>
35 #include <sys/imgact_elf.h>
36 #include <sys/syscall.h>
37 #include <sys/signalvar.h>
38 #include <sys/vnode.h>
39
40 #include <vm/vm.h>
41 #include <vm/pmap.h>
42 #include <vm/vm_param.h>
43
44 #include <machine/elf.h>
45 #include <machine/md_var.h>
46
47 struct sysentvec elf32_freebsd_sysvec = {
48 SYS_MAXSYSCALL,
49 sysent,
50 0,
51 0,
52 NULL,
53 0,
54 NULL,
55 NULL,
56 __elfN(freebsd_fixup),
57 sendsig,
58 sigcode,
59 &szsigcode,
60 NULL,
61 "FreeBSD ELF32",
62 __elfN(coredump),
63 NULL,
64 MINSIGSTKSZ,
65 PAGE_SIZE,
66 VM_MIN_ADDRESS,
67 VM_MAXUSER_ADDRESS,
68 USRSTACK,
69 PS_STRINGS,
70 VM_PROT_ALL,
71 exec_copyout_strings,
72 exec_setregs
73 };
74
75 static Elf32_Brandinfo freebsd_brand_info = {
76 ELFOSABI_FREEBSD,
77 EM_386,
78 "FreeBSD",
79 "",
80 "/usr/libexec/ld-elf.so.1",
81 &elf32_freebsd_sysvec
82 };
83
84 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY,
85 (sysinit_cfunc_t) elf32_insert_brand_entry,
86 &freebsd_brand_info);
87
88 /* Process one elf relocation with addend. */
89 static int
90 elf_reloc_internal(linker_file_t lf, const void *data, int type, int local)
91 {
92 Elf_Addr relocbase = (Elf_Addr) lf->address;
93 Elf_Addr *where;
94 Elf_Addr addr;
95 Elf_Addr addend;
96 Elf_Word rtype, symidx;
97 const Elf_Rel *rel;
98 const Elf_Rela *rela;
99
100 switch (type) {
101 case ELF_RELOC_REL:
102 rel = (const Elf_Rel *)data;
103 where = (Elf_Addr *) (relocbase + rel->r_offset);
104 addend = *where;
105 rtype = ELF_R_TYPE(rel->r_info);
106 symidx = ELF_R_SYM(rel->r_info);
107 break;
108 case ELF_RELOC_RELA:
109 rela = (const Elf_Rela *)data;
110 where = (Elf_Addr *) (relocbase + rela->r_offset);
111 addend = rela->r_addend;
112 rtype = ELF_R_TYPE(rela->r_info);
113 symidx = ELF_R_SYM(rela->r_info);
114 break;
115 default:
116 panic("unknown reloc type %d\n", type);
117 }
118
119 if (local) {
120 if (rtype == R_386_RELATIVE) { /* A + B */
121 addr = relocbase + addend;
122 if (*where != addr)
123 *where = addr;
124 }
125 return (0);
126 }
127
128 switch (rtype) {
129
130 case R_386_NONE: /* none */
131 break;
132
133 case R_386_32: /* S + A */
134 addr = elf_lookup(lf, symidx, 1);
135 if (addr == 0)
136 return -1;
137 addr += addend;
138 if (*where != addr)
139 *where = addr;
140 break;
141
142 case R_386_PC32: /* S + A - P */
143 addr = elf_lookup(lf, symidx, 1);
144 if (addr == 0)
145 return -1;
146 addr += addend - (Elf_Addr)where;
147 if (*where != addr)
148 *where = addr;
149 break;
150
151 case R_386_COPY: /* none */
152 /*
153 * There shouldn't be copy relocations in kernel
154 * objects.
155 */
156 printf("kldload: unexpected R_COPY relocation\n");
157 return -1;
158 break;
159
160 case R_386_GLOB_DAT: /* S */
161 addr = elf_lookup(lf, symidx, 1);
162 if (addr == 0)
163 return -1;
164 if (*where != addr)
165 *where = addr;
166 break;
167
168 case R_386_RELATIVE:
169 break;
170
171 default:
172 printf("kldload: unexpected relocation type %d\n",
173 rtype);
174 return -1;
175 }
176 return(0);
177 }
178
179 int
180 elf_reloc(linker_file_t lf, const void *data, int type)
181 {
182
183 return (elf_reloc_internal(lf, data, type, 0));
184 }
185
186 int
187 elf_reloc_local(linker_file_t lf, const void *data, int type)
188 {
189
190 return (elf_reloc_internal(lf, data, type, 1));
191 }
192
193 int
194 elf_cpu_load_file(linker_file_t lf __unused)
195 {
196
197 return (0);
198 }
199
200 int
201 elf_cpu_unload_file(linker_file_t lf __unused)
202 {
203
204 return (0);
205 }
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