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/8.3/sys/amd64/amd64/elf_machdep.c 222846 2011-06-08 03:45:40Z dchagin $");
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 addend = *(Elf32_Addr *)where;
165 break;
166 default:
167 addend = *where;
168 break;
169 }
170 break;
171 case ELF_RELOC_RELA:
172 rela = (const Elf_Rela *)data;
173 where = (Elf_Addr *) (relocbase + rela->r_offset);
174 addend = rela->r_addend;
175 rtype = ELF_R_TYPE(rela->r_info);
176 symidx = ELF_R_SYM(rela->r_info);
177 break;
178 default:
179 panic("unknown reloc type %d\n", type);
180 }
181
182 switch (rtype) {
183
184 case R_X86_64_NONE: /* none */
185 break;
186
187 case R_X86_64_64: /* S + A */
188 addr = lookup(lf, symidx, 1);
189 val = addr + addend;
190 if (addr == 0)
191 return -1;
192 if (*where != val)
193 *where = val;
194 break;
195
196 case R_X86_64_PC32: /* S + A - P */
197 addr = lookup(lf, symidx, 1);
198 where32 = (Elf32_Addr *)where;
199 val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
200 if (addr == 0)
201 return -1;
202 if (*where32 != val32)
203 *where32 = val32;
204 break;
205
206 case R_X86_64_32S: /* S + A sign extend */
207 addr = lookup(lf, symidx, 1);
208 val32 = (Elf32_Addr)(addr + addend);
209 where32 = (Elf32_Addr *)where;
210 if (addr == 0)
211 return -1;
212 if (*where32 != val32)
213 *where32 = val32;
214 break;
215
216 case R_X86_64_COPY: /* none */
217 /*
218 * There shouldn't be copy relocations in kernel
219 * objects.
220 */
221 printf("kldload: unexpected R_COPY relocation\n");
222 return -1;
223 break;
224
225 case R_X86_64_GLOB_DAT: /* S */
226 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
227 addr = lookup(lf, symidx, 1);
228 if (addr == 0)
229 return -1;
230 if (*where != addr)
231 *where = addr;
232 break;
233
234 case R_X86_64_RELATIVE: /* B + A */
235 addr = relocbase + addend;
236 val = addr;
237 if (*where != val)
238 *where = val;
239 break;
240
241 default:
242 printf("kldload: unexpected relocation type %ld\n",
243 rtype);
244 return -1;
245 }
246 return(0);
247 }
248
249 int
250 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
251 elf_lookup_fn lookup)
252 {
253
254 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
255 }
256
257 int
258 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
259 int type, elf_lookup_fn lookup)
260 {
261
262 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
263 }
264
265 int
266 elf_cpu_load_file(linker_file_t lf __unused)
267 {
268
269 return (0);
270 }
271
272 int
273 elf_cpu_unload_file(linker_file_t lf __unused)
274 {
275
276 return (0);
277 }
Cache object: 560785aded5ab24b443f81e73a81dc9e
|