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/7.4/sys/amd64/amd64/elf_machdep.c 196924 2009-09-07 13:37:04Z bz $");
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/sysent.h>
39 #include <sys/signalvar.h>
40 #include <sys/vnode.h>
41
42 #include <vm/vm.h>
43 #include <vm/pmap.h>
44 #include <vm/vm_param.h>
45
46 #include <machine/elf.h>
47 #include <machine/md_var.h>
48
49 struct sysentvec elf64_freebsd_sysvec = {
50 .sv_size = SYS_MAXSYSCALL,
51 .sv_table = sysent,
52 .sv_mask = 0,
53 .sv_sigsize = 0,
54 .sv_sigtbl = NULL,
55 .sv_errsize = 0,
56 .sv_errtbl = NULL,
57 .sv_transtrap = NULL,
58 .sv_fixup = __elfN(freebsd_fixup),
59 .sv_sendsig = sendsig,
60 .sv_sigcode = sigcode,
61 .sv_szsigcode = &szsigcode,
62 .sv_prepsyscall = NULL,
63 .sv_name = "FreeBSD ELF64",
64 .sv_coredump = __elfN(coredump),
65 .sv_imgact_try = NULL,
66 .sv_minsigstksz = MINSIGSTKSZ,
67 .sv_pagesize = PAGE_SIZE,
68 .sv_minuser = VM_MIN_ADDRESS,
69 .sv_maxuser = VM_MAXUSER_ADDRESS,
70 .sv_usrstack = USRSTACK,
71 .sv_psstrings = PS_STRINGS,
72 .sv_stackprot = VM_PROT_ALL,
73 .sv_copyout_strings = exec_copyout_strings,
74 .sv_setregs = exec_setregs,
75 .sv_fixlimit = NULL,
76 .sv_maxssiz = NULL
77 };
78
79 static Elf64_Brandinfo freebsd_brand_info = {
80 .brand = ELFOSABI_FREEBSD,
81 .machine = EM_X86_64,
82 .compat_3_brand = "FreeBSD",
83 .emul_path = NULL,
84 .interp_path = "/libexec/ld-elf.so.1",
85 .sysvec = &elf64_freebsd_sysvec,
86 .interp_newpath = NULL,
87 .brand_note = &elf64_freebsd_brandnote,
88 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
89 };
90
91 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
92 (sysinit_cfunc_t) elf64_insert_brand_entry,
93 &freebsd_brand_info);
94
95 static Elf64_Brandinfo freebsd_brand_oinfo = {
96 .brand = ELFOSABI_FREEBSD,
97 .machine = EM_X86_64,
98 .compat_3_brand = "FreeBSD",
99 .emul_path = NULL,
100 .interp_path = "/usr/libexec/ld-elf.so.1",
101 .sysvec = &elf64_freebsd_sysvec,
102 .interp_newpath = NULL,
103 .brand_note = &elf64_freebsd_brandnote,
104 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
105 };
106
107 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
108 (sysinit_cfunc_t) elf64_insert_brand_entry,
109 &freebsd_brand_oinfo);
110
111 static Elf64_Brandinfo kfreebsd_brand_info = {
112 .brand = ELFOSABI_FREEBSD,
113 .machine = EM_X86_64,
114 .compat_3_brand = "FreeBSD",
115 .emul_path = NULL,
116 .interp_path = "/lib/ld-kfreebsd-x86-64.so.1",
117 .sysvec = &elf64_freebsd_sysvec,
118 .interp_newpath = NULL,
119 .brand_note = &elf64_kfreebsd_brandnote,
120 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
121 };
122
123 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
124 (sysinit_cfunc_t) elf64_insert_brand_entry,
125 &kfreebsd_brand_info);
126
127
128 void
129 elf64_dump_thread(struct thread *td __unused, void *dst __unused,
130 size_t *off __unused)
131 {
132 }
133
134
135 /* Process one elf relocation with addend. */
136 static int
137 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
138 int type, int local, elf_lookup_fn lookup)
139 {
140 Elf64_Addr *where, val;
141 Elf32_Addr *where32, val32;
142 Elf_Addr addr;
143 Elf_Addr addend;
144 Elf_Size rtype, symidx;
145 const Elf_Rel *rel;
146 const Elf_Rela *rela;
147
148 switch (type) {
149 case ELF_RELOC_REL:
150 rel = (const Elf_Rel *)data;
151 where = (Elf_Addr *) (relocbase + rel->r_offset);
152 rtype = ELF_R_TYPE(rel->r_info);
153 symidx = ELF_R_SYM(rel->r_info);
154 /* Addend is 32 bit on 32 bit relocs */
155 switch (rtype) {
156 case R_X86_64_PC32:
157 case R_X86_64_32S:
158 addend = *(Elf32_Addr *)where;
159 break;
160 default:
161 addend = *where;
162 break;
163 }
164 break;
165 case ELF_RELOC_RELA:
166 rela = (const Elf_Rela *)data;
167 where = (Elf_Addr *) (relocbase + rela->r_offset);
168 addend = rela->r_addend;
169 rtype = ELF_R_TYPE(rela->r_info);
170 symidx = ELF_R_SYM(rela->r_info);
171 break;
172 default:
173 panic("unknown reloc type %d\n", type);
174 }
175
176 switch (rtype) {
177
178 case R_X86_64_NONE: /* none */
179 break;
180
181 case R_X86_64_64: /* S + A */
182 addr = lookup(lf, symidx, 1);
183 val = addr + addend;
184 if (addr == 0)
185 return -1;
186 if (*where != val)
187 *where = val;
188 break;
189
190 case R_X86_64_PC32: /* S + A - P */
191 addr = lookup(lf, symidx, 1);
192 where32 = (Elf32_Addr *)where;
193 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
194 if (addr == 0)
195 return -1;
196 if (*where32 != val32)
197 *where32 = val32;
198 break;
199
200 case R_X86_64_32S: /* S + A sign extend */
201 addr = lookup(lf, symidx, 1);
202 val32 = (Elf32_Addr)(addr + addend);
203 where32 = (Elf32_Addr *)where;
204 if (addr == 0)
205 return -1;
206 if (*where32 != val32)
207 *where32 = val32;
208 break;
209
210 case R_X86_64_COPY: /* none */
211 /*
212 * There shouldn't be copy relocations in kernel
213 * objects.
214 */
215 printf("kldload: unexpected R_COPY relocation\n");
216 return -1;
217 break;
218
219 case R_X86_64_GLOB_DAT: /* S */
220 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
221 addr = lookup(lf, symidx, 1);
222 if (addr == 0)
223 return -1;
224 if (*where != addr)
225 *where = addr;
226 break;
227
228 case R_X86_64_RELATIVE: /* B + A */
229 addr = relocbase + addend;
230 val = addr;
231 if (*where != val)
232 *where = val;
233 break;
234
235 default:
236 printf("kldload: unexpected relocation type %ld\n",
237 rtype);
238 return -1;
239 }
240 return(0);
241 }
242
243 int
244 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
245 elf_lookup_fn lookup)
246 {
247
248 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
249 }
250
251 int
252 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
253 int type, elf_lookup_fn lookup)
254 {
255
256 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
257 }
258
259 int
260 elf_cpu_load_file(linker_file_t lf __unused)
261 {
262
263 return (0);
264 }
265
266 int
267 elf_cpu_unload_file(linker_file_t lf __unused)
268 {
269
270 return (0);
271 }
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