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/8.2/sys/amd64/amd64/elf_machdep.c 214755 2010-11-03 21:21:12Z kib $");
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 };
83
84 static Elf64_Brandinfo freebsd_brand_info = {
85 .brand = ELFOSABI_FREEBSD,
86 .machine = EM_X86_64,
87 .compat_3_brand = "FreeBSD",
88 .emul_path = NULL,
89 .interp_path = "/libexec/ld-elf.so.1",
90 .sysvec = &elf64_freebsd_sysvec,
91 .interp_newpath = NULL,
92 .brand_note = &elf64_freebsd_brandnote,
93 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
94 };
95
96 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
97 (sysinit_cfunc_t) elf64_insert_brand_entry,
98 &freebsd_brand_info);
99
100 static Elf64_Brandinfo freebsd_brand_oinfo = {
101 .brand = ELFOSABI_FREEBSD,
102 .machine = EM_X86_64,
103 .compat_3_brand = "FreeBSD",
104 .emul_path = NULL,
105 .interp_path = "/usr/libexec/ld-elf.so.1",
106 .sysvec = &elf64_freebsd_sysvec,
107 .interp_newpath = NULL,
108 .brand_note = &elf64_freebsd_brandnote,
109 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
110 };
111
112 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
113 (sysinit_cfunc_t) elf64_insert_brand_entry,
114 &freebsd_brand_oinfo);
115
116 static Elf64_Brandinfo kfreebsd_brand_info = {
117 .brand = ELFOSABI_FREEBSD,
118 .machine = EM_X86_64,
119 .compat_3_brand = "FreeBSD",
120 .emul_path = NULL,
121 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1",
122 .sysvec = &elf64_freebsd_sysvec,
123 .interp_newpath = NULL,
124 .brand_note = &elf64_kfreebsd_brandnote,
125 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
126 };
127
128 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
129 (sysinit_cfunc_t) elf64_insert_brand_entry,
130 &kfreebsd_brand_info);
131
132
133 void
134 elf64_dump_thread(struct thread *td __unused, void *dst __unused,
135 size_t *off __unused)
136 {
137 }
138
139
140 /* Process one elf relocation with addend. */
141 static int
142 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
143 int type, int local, elf_lookup_fn lookup)
144 {
145 Elf64_Addr *where, val;
146 Elf32_Addr *where32, val32;
147 Elf_Addr addr;
148 Elf_Addr addend;
149 Elf_Size rtype, symidx;
150 const Elf_Rel *rel;
151 const Elf_Rela *rela;
152
153 switch (type) {
154 case ELF_RELOC_REL:
155 rel = (const Elf_Rel *)data;
156 where = (Elf_Addr *) (relocbase + rel->r_offset);
157 rtype = ELF_R_TYPE(rel->r_info);
158 symidx = ELF_R_SYM(rel->r_info);
159 /* Addend is 32 bit on 32 bit relocs */
160 switch (rtype) {
161 case R_X86_64_PC32:
162 case R_X86_64_32S:
163 addend = *(Elf32_Addr *)where;
164 break;
165 default:
166 addend = *where;
167 break;
168 }
169 break;
170 case ELF_RELOC_RELA:
171 rela = (const Elf_Rela *)data;
172 where = (Elf_Addr *) (relocbase + rela->r_offset);
173 addend = rela->r_addend;
174 rtype = ELF_R_TYPE(rela->r_info);
175 symidx = ELF_R_SYM(rela->r_info);
176 break;
177 default:
178 panic("unknown reloc type %d\n", type);
179 }
180
181 switch (rtype) {
182
183 case R_X86_64_NONE: /* none */
184 break;
185
186 case R_X86_64_64: /* S + A */
187 addr = lookup(lf, symidx, 1);
188 val = addr + addend;
189 if (addr == 0)
190 return -1;
191 if (*where != val)
192 *where = val;
193 break;
194
195 case R_X86_64_PC32: /* S + A - P */
196 addr = lookup(lf, symidx, 1);
197 where32 = (Elf32_Addr *)where;
198 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
199 if (addr == 0)
200 return -1;
201 if (*where32 != val32)
202 *where32 = val32;
203 break;
204
205 case R_X86_64_32S: /* S + A sign extend */
206 addr = lookup(lf, symidx, 1);
207 val32 = (Elf32_Addr)(addr + addend);
208 where32 = (Elf32_Addr *)where;
209 if (addr == 0)
210 return -1;
211 if (*where32 != val32)
212 *where32 = val32;
213 break;
214
215 case R_X86_64_COPY: /* none */
216 /*
217 * There shouldn't be copy relocations in kernel
218 * objects.
219 */
220 printf("kldload: unexpected R_COPY relocation\n");
221 return -1;
222 break;
223
224 case R_X86_64_GLOB_DAT: /* S */
225 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
226 addr = lookup(lf, symidx, 1);
227 if (addr == 0)
228 return -1;
229 if (*where != addr)
230 *where = addr;
231 break;
232
233 case R_X86_64_RELATIVE: /* B + A */
234 addr = relocbase + addend;
235 val = addr;
236 if (*where != val)
237 *where = val;
238 break;
239
240 default:
241 printf("kldload: unexpected relocation type %ld\n",
242 rtype);
243 return -1;
244 }
245 return(0);
246 }
247
248 int
249 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
250 elf_lookup_fn lookup)
251 {
252
253 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
254 }
255
256 int
257 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
258 int type, elf_lookup_fn lookup)
259 {
260
261 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
262 }
263
264 int
265 elf_cpu_load_file(linker_file_t lf __unused)
266 {
267
268 return (0);
269 }
270
271 int
272 elf_cpu_unload_file(linker_file_t lf __unused)
273 {
274
275 return (0);
276 }
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