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/proc.h>
36 #include <sys/sysent.h>
37 #include <sys/imgact_elf.h>
38 #include <sys/syscall.h>
39 #include <sys/sysent.h>
40 #include <sys/signalvar.h>
41 #include <sys/vnode.h>
42
43 #include <vm/vm.h>
44 #include <vm/pmap.h>
45 #include <vm/vm_param.h>
46
47 #include <machine/elf.h>
48 #include <machine/md_var.h>
49
50 struct sysentvec elf64_freebsd_sysvec = {
51 .sv_size = SYS_MAXSYSCALL,
52 .sv_table = sysent,
53 .sv_mask = 0,
54 .sv_sigsize = 0,
55 .sv_sigtbl = NULL,
56 .sv_errsize = 0,
57 .sv_errtbl = NULL,
58 .sv_transtrap = NULL,
59 .sv_fixup = __elfN(freebsd_fixup),
60 .sv_sendsig = sendsig,
61 .sv_sigcode = sigcode,
62 .sv_szsigcode = &szsigcode,
63 .sv_prepsyscall = NULL,
64 .sv_name = "FreeBSD ELF64",
65 .sv_coredump = __elfN(coredump),
66 .sv_imgact_try = NULL,
67 .sv_minsigstksz = MINSIGSTKSZ,
68 .sv_pagesize = PAGE_SIZE,
69 .sv_minuser = VM_MIN_ADDRESS,
70 .sv_maxuser = VM_MAXUSER_ADDRESS,
71 .sv_usrstack = USRSTACK,
72 .sv_psstrings = PS_STRINGS,
73 .sv_stackprot = VM_PROT_ALL,
74 .sv_copyout_strings = exec_copyout_strings,
75 .sv_setregs = exec_setregs,
76 .sv_fixlimit = NULL,
77 .sv_maxssiz = NULL,
78 .sv_flags = SV_ABI_FREEBSD | SV_LP64,
79 .sv_set_syscall_retval = cpu_set_syscall_retval,
80 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
81 .sv_syscallnames = syscallnames,
82 .sv_schedtail = NULL,
83 };
84
85 static Elf64_Brandinfo freebsd_brand_info = {
86 .brand = ELFOSABI_FREEBSD,
87 .machine = EM_X86_64,
88 .compat_3_brand = "FreeBSD",
89 .emul_path = NULL,
90 .interp_path = "/libexec/ld-elf.so.1",
91 .sysvec = &elf64_freebsd_sysvec,
92 .interp_newpath = NULL,
93 .brand_note = &elf64_freebsd_brandnote,
94 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
95 };
96
97 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
98 (sysinit_cfunc_t) elf64_insert_brand_entry,
99 &freebsd_brand_info);
100
101 static Elf64_Brandinfo freebsd_brand_oinfo = {
102 .brand = ELFOSABI_FREEBSD,
103 .machine = EM_X86_64,
104 .compat_3_brand = "FreeBSD",
105 .emul_path = NULL,
106 .interp_path = "/usr/libexec/ld-elf.so.1",
107 .sysvec = &elf64_freebsd_sysvec,
108 .interp_newpath = NULL,
109 .brand_note = &elf64_freebsd_brandnote,
110 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
111 };
112
113 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
114 (sysinit_cfunc_t) elf64_insert_brand_entry,
115 &freebsd_brand_oinfo);
116
117 static Elf64_Brandinfo kfreebsd_brand_info = {
118 .brand = ELFOSABI_FREEBSD,
119 .machine = EM_X86_64,
120 .compat_3_brand = "FreeBSD",
121 .emul_path = NULL,
122 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1",
123 .sysvec = &elf64_freebsd_sysvec,
124 .interp_newpath = NULL,
125 .brand_note = &elf64_kfreebsd_brandnote,
126 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
127 };
128
129 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
130 (sysinit_cfunc_t) elf64_insert_brand_entry,
131 &kfreebsd_brand_info);
132
133
134 void
135 elf64_dump_thread(struct thread *td __unused, void *dst __unused,
136 size_t *off __unused)
137 {
138 }
139
140
141 /* Process one elf relocation with addend. */
142 static int
143 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
144 int type, int local, elf_lookup_fn lookup)
145 {
146 Elf64_Addr *where, val;
147 Elf32_Addr *where32, val32;
148 Elf_Addr addr;
149 Elf_Addr addend;
150 Elf_Size rtype, symidx;
151 const Elf_Rel *rel;
152 const Elf_Rela *rela;
153
154 switch (type) {
155 case ELF_RELOC_REL:
156 rel = (const Elf_Rel *)data;
157 where = (Elf_Addr *) (relocbase + rel->r_offset);
158 rtype = ELF_R_TYPE(rel->r_info);
159 symidx = ELF_R_SYM(rel->r_info);
160 /* Addend is 32 bit on 32 bit relocs */
161 switch (rtype) {
162 case R_X86_64_PC32:
163 case R_X86_64_32S:
164 case R_X86_64_PLT32:
165 addend = *(Elf32_Addr *)where;
166 break;
167 default:
168 addend = *where;
169 break;
170 }
171 break;
172 case ELF_RELOC_RELA:
173 rela = (const Elf_Rela *)data;
174 where = (Elf_Addr *) (relocbase + rela->r_offset);
175 addend = rela->r_addend;
176 rtype = ELF_R_TYPE(rela->r_info);
177 symidx = ELF_R_SYM(rela->r_info);
178 break;
179 default:
180 panic("unknown reloc type %d\n", type);
181 }
182
183 switch (rtype) {
184
185 case R_X86_64_NONE: /* none */
186 break;
187
188 case R_X86_64_64: /* S + A */
189 addr = lookup(lf, symidx, 1);
190 val = addr + addend;
191 if (addr == 0)
192 return -1;
193 if (*where != val)
194 *where = val;
195 break;
196
197 case R_X86_64_PC32: /* S + A - P */
198 case R_X86_64_PLT32: /* L + A - P, L is PLT location for
199 the symbol, which we treat as S */
200 addr = lookup(lf, symidx, 1);
201 where32 = (Elf32_Addr *)where;
202 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
203 if (addr == 0)
204 return -1;
205 if (*where32 != val32)
206 *where32 = val32;
207 break;
208
209 case R_X86_64_32S: /* S + A sign extend */
210 addr = lookup(lf, symidx, 1);
211 val32 = (Elf32_Addr)(addr + addend);
212 where32 = (Elf32_Addr *)where;
213 if (addr == 0)
214 return -1;
215 if (*where32 != val32)
216 *where32 = val32;
217 break;
218
219 case R_X86_64_COPY: /* none */
220 /*
221 * There shouldn't be copy relocations in kernel
222 * objects.
223 */
224 printf("kldload: unexpected R_COPY relocation\n");
225 return -1;
226 break;
227
228 case R_X86_64_GLOB_DAT: /* S */
229 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
230 addr = lookup(lf, symidx, 1);
231 if (addr == 0)
232 return -1;
233 if (*where != addr)
234 *where = addr;
235 break;
236
237 case R_X86_64_RELATIVE: /* B + A */
238 addr = relocbase + addend;
239 val = addr;
240 if (*where != val)
241 *where = val;
242 break;
243
244 default:
245 printf("kldload: unexpected relocation type %ld\n",
246 rtype);
247 return -1;
248 }
249 return(0);
250 }
251
252 int
253 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
254 elf_lookup_fn lookup)
255 {
256
257 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
258 }
259
260 int
261 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
262 int type, elf_lookup_fn lookup)
263 {
264
265 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
266 }
267
268 int
269 elf_cpu_load_file(linker_file_t lf __unused)
270 {
271
272 return (0);
273 }
274
275 int
276 elf_cpu_unload_file(linker_file_t lf __unused)
277 {
278
279 return (0);
280 }
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