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: releng/5.4/sys/amd64/amd64/elf_machdep.c 145335 2005-04-20 19:11:07Z cvs2svn $");
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 elf64_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 ELF64",
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 Elf64_Brandinfo freebsd_brand_info = {
78 ELFOSABI_FREEBSD,
79 EM_X86_64,
80 "FreeBSD",
81 NULL,
82 "/libexec/ld-elf.so.1",
83 &elf64_freebsd_sysvec,
84 NULL,
85 };
86
87 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
88 (sysinit_cfunc_t) elf64_insert_brand_entry,
89 &freebsd_brand_info);
90
91 static Elf64_Brandinfo freebsd_brand_oinfo = {
92 ELFOSABI_FREEBSD,
93 EM_X86_64,
94 "FreeBSD",
95 NULL,
96 "/usr/libexec/ld-elf.so.1",
97 &elf64_freebsd_sysvec,
98 NULL,
99 };
100
101 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
102 (sysinit_cfunc_t) elf64_insert_brand_entry,
103 &freebsd_brand_oinfo);
104
105
106 void
107 elf64_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 Elf64_Addr *where, val;
119 Elf32_Addr *where32, val32;
120 Elf_Addr addr;
121 Elf_Addr addend;
122 Elf_Word rtype, symidx;
123 const Elf_Rel *rel;
124 const Elf_Rela *rela;
125
126 switch (type) {
127 case ELF_RELOC_REL:
128 rel = (const Elf_Rel *)data;
129 where = (Elf_Addr *) (relocbase + rel->r_offset);
130 rtype = ELF_R_TYPE(rel->r_info);
131 symidx = ELF_R_SYM(rel->r_info);
132 /* Addend is 32 bit on 32 bit relocs */
133 switch (rtype) {
134 case R_X86_64_PC32:
135 case R_X86_64_32S:
136 addend = *(Elf32_Addr *)where;
137 break;
138 default:
139 addend = *where;
140 break;
141 }
142 break;
143 case ELF_RELOC_RELA:
144 rela = (const Elf_Rela *)data;
145 where = (Elf_Addr *) (relocbase + rela->r_offset);
146 addend = rela->r_addend;
147 rtype = ELF_R_TYPE(rela->r_info);
148 symidx = ELF_R_SYM(rela->r_info);
149 break;
150 default:
151 panic("unknown reloc type %d\n", type);
152 }
153
154 switch (rtype) {
155
156 case R_X86_64_NONE: /* none */
157 break;
158
159 case R_X86_64_64: /* S + A */
160 addr = lookup(lf, symidx, 1);
161 val = addr + addend;
162 if (addr == 0)
163 return -1;
164 if (*where != val)
165 *where = val;
166 break;
167
168 case R_X86_64_PC32: /* S + A - P */
169 addr = lookup(lf, symidx, 1);
170 where32 = (Elf32_Addr *)where;
171 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
172 if (addr == 0)
173 return -1;
174 if (*where32 != val32)
175 *where32 = val32;
176 break;
177
178 case R_X86_64_32S: /* S + A sign extend */
179 addr = lookup(lf, symidx, 1);
180 val32 = (Elf32_Addr)(addr + addend);
181 where32 = (Elf32_Addr *)where;
182 if (addr == 0)
183 return -1;
184 if (*where32 != val32)
185 *where32 = val32;
186 break;
187
188 case R_X86_64_COPY: /* none */
189 /*
190 * There shouldn't be copy relocations in kernel
191 * objects.
192 */
193 printf("kldload: unexpected R_COPY relocation\n");
194 return -1;
195 break;
196
197 case R_X86_64_GLOB_DAT: /* S */
198 addr = lookup(lf, symidx, 1);
199 if (addr == 0)
200 return -1;
201 if (*where != addr)
202 *where = addr;
203 break;
204
205 case R_X86_64_RELATIVE: /* B + A */
206 addr = relocbase + addend;
207 val = addr;
208 if (*where != val)
209 *where = val;
210 break;
211
212 default:
213 printf("kldload: unexpected relocation type %ld\n",
214 rtype);
215 return -1;
216 }
217 return(0);
218 }
219
220 int
221 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
222 elf_lookup_fn lookup)
223 {
224
225 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
226 }
227
228 int
229 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
230 int type, elf_lookup_fn lookup)
231 {
232
233 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
234 }
235
236 int
237 elf_cpu_load_file(linker_file_t lf __unused)
238 {
239
240 return (0);
241 }
242
243 int
244 elf_cpu_unload_file(linker_file_t lf __unused)
245 {
246
247 return (0);
248 }
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