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 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 BI_CAN_EXEC_DYN,
86 };
87
88 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
89 (sysinit_cfunc_t) elf64_insert_brand_entry,
90 &freebsd_brand_info);
91
92 static Elf64_Brandinfo freebsd_brand_oinfo = {
93 ELFOSABI_FREEBSD,
94 EM_X86_64,
95 "FreeBSD",
96 NULL,
97 "/usr/libexec/ld-elf.so.1",
98 &elf64_freebsd_sysvec,
99 NULL,
100 BI_CAN_EXEC_DYN,
101 };
102
103 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
104 (sysinit_cfunc_t) elf64_insert_brand_entry,
105 &freebsd_brand_oinfo);
106
107
108 void
109 elf64_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 Elf64_Addr *where, val;
121 Elf32_Addr *where32, val32;
122 Elf_Addr addr;
123 Elf_Addr addend;
124 Elf_Size rtype, symidx;
125 const Elf_Rel *rel;
126 const Elf_Rela *rela;
127
128 switch (type) {
129 case ELF_RELOC_REL:
130 rel = (const Elf_Rel *)data;
131 where = (Elf_Addr *) (relocbase + rel->r_offset);
132 rtype = ELF_R_TYPE(rel->r_info);
133 symidx = ELF_R_SYM(rel->r_info);
134 /* Addend is 32 bit on 32 bit relocs */
135 switch (rtype) {
136 case R_X86_64_PC32:
137 case R_X86_64_32S:
138 addend = *(Elf32_Addr *)where;
139 break;
140 default:
141 addend = *where;
142 break;
143 }
144 break;
145 case ELF_RELOC_RELA:
146 rela = (const Elf_Rela *)data;
147 where = (Elf_Addr *) (relocbase + rela->r_offset);
148 addend = rela->r_addend;
149 rtype = ELF_R_TYPE(rela->r_info);
150 symidx = ELF_R_SYM(rela->r_info);
151 break;
152 default:
153 panic("unknown reloc type %d\n", type);
154 }
155
156 switch (rtype) {
157
158 case R_X86_64_NONE: /* none */
159 break;
160
161 case R_X86_64_64: /* S + A */
162 addr = lookup(lf, symidx, 1);
163 val = addr + addend;
164 if (addr == 0)
165 return -1;
166 if (*where != val)
167 *where = val;
168 break;
169
170 case R_X86_64_PC32: /* S + A - P */
171 addr = lookup(lf, symidx, 1);
172 where32 = (Elf32_Addr *)where;
173 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
174 if (addr == 0)
175 return -1;
176 if (*where32 != val32)
177 *where32 = val32;
178 break;
179
180 case R_X86_64_32S: /* S + A sign extend */
181 addr = lookup(lf, symidx, 1);
182 val32 = (Elf32_Addr)(addr + addend);
183 where32 = (Elf32_Addr *)where;
184 if (addr == 0)
185 return -1;
186 if (*where32 != val32)
187 *where32 = val32;
188 break;
189
190 case R_X86_64_COPY: /* none */
191 /*
192 * There shouldn't be copy relocations in kernel
193 * objects.
194 */
195 printf("kldload: unexpected R_COPY relocation\n");
196 return -1;
197 break;
198
199 case R_X86_64_GLOB_DAT: /* S */
200 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
201 addr = lookup(lf, symidx, 1);
202 if (addr == 0)
203 return -1;
204 if (*where != addr)
205 *where = addr;
206 break;
207
208 case R_X86_64_RELATIVE: /* B + A */
209 addr = relocbase + addend;
210 val = addr;
211 if (*where != val)
212 *where = val;
213 break;
214
215 default:
216 printf("kldload: unexpected relocation type %ld\n",
217 rtype);
218 return -1;
219 }
220 return(0);
221 }
222
223 int
224 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
225 elf_lookup_fn lookup)
226 {
227
228 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
229 }
230
231 int
232 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
233 int type, elf_lookup_fn lookup)
234 {
235
236 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
237 }
238
239 int
240 elf_cpu_load_file(linker_file_t lf __unused)
241 {
242
243 return (0);
244 }
245
246 int
247 elf_cpu_unload_file(linker_file_t lf __unused)
248 {
249
250 return (0);
251 }
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