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 BI_CAN_EXEC_DYN,
86 };
87
88 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY,
89 (sysinit_cfunc_t) elf32_insert_brand_entry,
90 &freebsd_brand_info);
91
92 static Elf32_Brandinfo freebsd_brand_oinfo = {
93 ELFOSABI_FREEBSD,
94 EM_386,
95 "FreeBSD",
96 NULL,
97 "/usr/libexec/ld-elf.so.1",
98 &elf32_freebsd_sysvec,
99 NULL,
100 BI_CAN_EXEC_DYN,
101 };
102
103 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
104 (sysinit_cfunc_t) elf32_insert_brand_entry,
105 &freebsd_brand_oinfo);
106
107
108 void
109 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
110 size_t *off __unused)
111 {
112 }
113
114
115 /* Process one elf relocation with addend. */
116 static int
117 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
118 int type, int local, elf_lookup_fn lookup)
119 {
120 Elf_Addr *where;
121 Elf_Addr addr;
122 Elf_Addr addend;
123 Elf_Word rtype, symidx;
124 const Elf_Rel *rel;
125 const Elf_Rela *rela;
126
127 switch (type) {
128 case ELF_RELOC_REL:
129 rel = (const Elf_Rel *)data;
130 where = (Elf_Addr *) (relocbase + rel->r_offset);
131 addend = *where;
132 rtype = ELF_R_TYPE(rel->r_info);
133 symidx = ELF_R_SYM(rel->r_info);
134 break;
135 case ELF_RELOC_RELA:
136 rela = (const Elf_Rela *)data;
137 where = (Elf_Addr *) (relocbase + rela->r_offset);
138 addend = rela->r_addend;
139 rtype = ELF_R_TYPE(rela->r_info);
140 symidx = ELF_R_SYM(rela->r_info);
141 break;
142 default:
143 panic("unknown reloc type %d\n", type);
144 }
145
146 if (local) {
147 if (rtype == R_386_RELATIVE) { /* A + B */
148 addr = relocbase + addend;
149 if (*where != addr)
150 *where = addr;
151 }
152 return (0);
153 }
154
155 switch (rtype) {
156
157 case R_386_NONE: /* none */
158 break;
159
160 case R_386_32: /* S + A */
161 addr = lookup(lf, symidx, 1);
162 if (addr == 0)
163 return -1;
164 addr += addend;
165 if (*where != addr)
166 *where = addr;
167 break;
168
169 case R_386_PC32: /* S + A - P */
170 addr = lookup(lf, symidx, 1);
171 if (addr == 0)
172 return -1;
173 addr += addend - (Elf_Addr)where;
174 if (*where != addr)
175 *where = addr;
176 break;
177
178 case R_386_COPY: /* none */
179 /*
180 * There shouldn't be copy relocations in kernel
181 * objects.
182 */
183 printf("kldload: unexpected R_COPY relocation\n");
184 return -1;
185 break;
186
187 case R_386_GLOB_DAT: /* S */
188 addr = lookup(lf, symidx, 1);
189 if (addr == 0)
190 return -1;
191 if (*where != addr)
192 *where = addr;
193 break;
194
195 case R_386_RELATIVE:
196 break;
197
198 default:
199 printf("kldload: unexpected relocation type %d\n",
200 rtype);
201 return -1;
202 }
203 return(0);
204 }
205
206 int
207 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
208 elf_lookup_fn lookup)
209 {
210
211 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
212 }
213
214 int
215 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
216 int type, elf_lookup_fn lookup)
217 {
218
219 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
220 }
221
222 int
223 elf_cpu_load_file(linker_file_t lf __unused)
224 {
225
226 return (0);
227 }
228
229 int
230 elf_cpu_unload_file(linker_file_t lf __unused)
231 {
232
233 return (0);
234 }
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