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
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
28
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/systm.h>
32 #include <sys/exec.h>
33 #include <sys/imgact.h>
34 #include <sys/linker.h>
35 #include <sys/sysent.h>
36 #include <sys/imgact_elf.h>
37 #include <sys/syscall.h>
38 #include <sys/signalvar.h>
39 #include <sys/vnode.h>
40
41 #include <vm/vm.h>
42 #include <vm/pmap.h>
43 #include <vm/vm_param.h>
44
45 #include <machine/elf.h>
46 #include <machine/md_var.h>
47
48 struct sysentvec elf32_freebsd_sysvec = {
49 SYS_MAXSYSCALL,
50 sysent,
51 0,
52 0,
53 NULL,
54 0,
55 NULL,
56 NULL,
57 __elfN(freebsd_fixup),
58 sendsig,
59 sigcode,
60 &szsigcode,
61 NULL,
62 "FreeBSD ELF32",
63 __elfN(coredump),
64 NULL,
65 MINSIGSTKSZ,
66 PAGE_SIZE,
67 VM_MIN_ADDRESS,
68 VM_MAXUSER_ADDRESS,
69 USRSTACK,
70 PS_STRINGS,
71 VM_PROT_ALL,
72 exec_copyout_strings,
73 exec_setregs,
74 NULL
75 };
76
77 static Elf32_Brandinfo freebsd_brand_info = {
78 ELFOSABI_FREEBSD,
79 EM_386,
80 "FreeBSD",
81 NULL,
82 "/libexec/ld-elf.so.1",
83 &elf32_freebsd_sysvec,
84 NULL,
85 };
86
87 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY,
88 (sysinit_cfunc_t) elf32_insert_brand_entry,
89 &freebsd_brand_info);
90
91 static Elf32_Brandinfo freebsd_brand_oinfo = {
92 ELFOSABI_FREEBSD,
93 EM_386,
94 "FreeBSD",
95 NULL,
96 "/usr/libexec/ld-elf.so.1",
97 &elf32_freebsd_sysvec,
98 NULL,
99 };
100
101 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
102 (sysinit_cfunc_t) elf32_insert_brand_entry,
103 &freebsd_brand_oinfo);
104
105
106 void
107 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
108 size_t *off __unused)
109 {
110 }
111
112
113 /* Process one elf relocation with addend. */
114 static int
115 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
116 int type, int local, elf_lookup_fn lookup)
117 {
118 Elf_Addr *where;
119 Elf_Addr addr;
120 Elf_Addr addend;
121 Elf_Word rtype, symidx;
122 const Elf_Rel *rel;
123 const Elf_Rela *rela;
124
125 switch (type) {
126 case ELF_RELOC_REL:
127 rel = (const Elf_Rel *)data;
128 where = (Elf_Addr *) (relocbase + rel->r_offset);
129 addend = *where;
130 rtype = ELF_R_TYPE(rel->r_info);
131 symidx = ELF_R_SYM(rel->r_info);
132 break;
133 case ELF_RELOC_RELA:
134 rela = (const Elf_Rela *)data;
135 where = (Elf_Addr *) (relocbase + rela->r_offset);
136 addend = rela->r_addend;
137 rtype = ELF_R_TYPE(rela->r_info);
138 symidx = ELF_R_SYM(rela->r_info);
139 break;
140 default:
141 panic("unknown reloc type %d\n", type);
142 }
143
144 if (local) {
145 if (rtype == R_386_RELATIVE) { /* A + B */
146 addr = relocbase + addend;
147 if (*where != addr)
148 *where = addr;
149 }
150 return (0);
151 }
152
153 switch (rtype) {
154
155 case R_386_NONE: /* none */
156 break;
157
158 case R_386_32: /* S + A */
159 addr = lookup(lf, symidx, 1);
160 if (addr == 0)
161 return -1;
162 addr += addend;
163 if (*where != addr)
164 *where = addr;
165 break;
166
167 case R_386_PC32: /* S + A - P */
168 addr = lookup(lf, symidx, 1);
169 if (addr == 0)
170 return -1;
171 addr += addend - (Elf_Addr)where;
172 if (*where != addr)
173 *where = addr;
174 break;
175
176 case R_386_COPY: /* none */
177 /*
178 * There shouldn't be copy relocations in kernel
179 * objects.
180 */
181 printf("kldload: unexpected R_COPY relocation\n");
182 return -1;
183 break;
184
185 case R_386_GLOB_DAT: /* S */
186 addr = lookup(lf, symidx, 1);
187 if (addr == 0)
188 return -1;
189 if (*where != addr)
190 *where = addr;
191 break;
192
193 case R_386_RELATIVE:
194 break;
195
196 default:
197 printf("kldload: unexpected relocation type %d\n",
198 rtype);
199 return -1;
200 }
201 return(0);
202 }
203
204 int
205 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
206 elf_lookup_fn lookup)
207 {
208
209 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
210 }
211
212 int
213 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
214 int type, elf_lookup_fn lookup)
215 {
216
217 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
218 }
219
220 int
221 elf_cpu_load_file(linker_file_t lf __unused)
222 {
223
224 return (0);
225 }
226
227 int
228 elf_cpu_unload_file(linker_file_t lf __unused)
229 {
230
231 return (0);
232 }
Cache object: 0e739b2d320822100218d60a9ff0b8d5
|