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/8.4/sys/i386/i386/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/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 elf32_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 ELF32",
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 .sv_flags = SV_ABI_FREEBSD | SV_IA32 | SV_ILP32,
78 .sv_set_syscall_retval = cpu_set_syscall_retval,
79 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
80 .sv_syscallnames = syscallnames,
81 .sv_schedtail = NULL,
82 };
83
84 static Elf32_Brandinfo freebsd_brand_info = {
85 .brand = ELFOSABI_FREEBSD,
86 .machine = EM_386,
87 .compat_3_brand = "FreeBSD",
88 .emul_path = NULL,
89 .interp_path = "/libexec/ld-elf.so.1",
90 .sysvec = &elf32_freebsd_sysvec,
91 .interp_newpath = NULL,
92 .brand_note = &elf32_freebsd_brandnote,
93 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
94 };
95
96 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
97 (sysinit_cfunc_t) elf32_insert_brand_entry,
98 &freebsd_brand_info);
99
100 static Elf32_Brandinfo freebsd_brand_oinfo = {
101 .brand = ELFOSABI_FREEBSD,
102 .machine = EM_386,
103 .compat_3_brand = "FreeBSD",
104 .emul_path = NULL,
105 .interp_path = "/usr/libexec/ld-elf.so.1",
106 .sysvec = &elf32_freebsd_sysvec,
107 .interp_newpath = NULL,
108 .brand_note = &elf32_freebsd_brandnote,
109 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
110 };
111
112 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
113 (sysinit_cfunc_t) elf32_insert_brand_entry,
114 &freebsd_brand_oinfo);
115
116 static Elf32_Brandinfo kfreebsd_brand_info = {
117 .brand = ELFOSABI_FREEBSD,
118 .machine = EM_386,
119 .compat_3_brand = "FreeBSD",
120 .emul_path = NULL,
121 .interp_path = "/lib/ld.so.1",
122 .sysvec = &elf32_freebsd_sysvec,
123 .interp_newpath = NULL,
124 .brand_note = &elf32_kfreebsd_brandnote,
125 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
126 };
127
128 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
129 (sysinit_cfunc_t) elf32_insert_brand_entry,
130 &kfreebsd_brand_info);
131
132
133 void
134 elf32_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 Elf_Addr *where;
146 Elf_Addr addr;
147 Elf_Addr addend;
148 Elf_Word rtype, symidx;
149 const Elf_Rel *rel;
150 const Elf_Rela *rela;
151
152 switch (type) {
153 case ELF_RELOC_REL:
154 rel = (const Elf_Rel *)data;
155 where = (Elf_Addr *) (relocbase + rel->r_offset);
156 addend = *where;
157 rtype = ELF_R_TYPE(rel->r_info);
158 symidx = ELF_R_SYM(rel->r_info);
159 break;
160 case ELF_RELOC_RELA:
161 rela = (const Elf_Rela *)data;
162 where = (Elf_Addr *) (relocbase + rela->r_offset);
163 addend = rela->r_addend;
164 rtype = ELF_R_TYPE(rela->r_info);
165 symidx = ELF_R_SYM(rela->r_info);
166 break;
167 default:
168 panic("unknown reloc type %d\n", type);
169 }
170
171 if (local) {
172 if (rtype == R_386_RELATIVE) { /* A + B */
173 addr = elf_relocaddr(lf, relocbase + addend);
174 if (*where != addr)
175 *where = addr;
176 }
177 return (0);
178 }
179
180 switch (rtype) {
181
182 case R_386_NONE: /* none */
183 break;
184
185 case R_386_32: /* S + A */
186 addr = lookup(lf, symidx, 1);
187 if (addr == 0)
188 return -1;
189 addr += addend;
190 if (*where != addr)
191 *where = addr;
192 break;
193
194 case R_386_PC32: /* S + A - P */
195 addr = lookup(lf, symidx, 1);
196 if (addr == 0)
197 return -1;
198 addr += addend - (Elf_Addr)where;
199 if (*where != addr)
200 *where = addr;
201 break;
202
203 case R_386_COPY: /* none */
204 /*
205 * There shouldn't be copy relocations in kernel
206 * objects.
207 */
208 printf("kldload: unexpected R_COPY relocation\n");
209 return -1;
210 break;
211
212 case R_386_GLOB_DAT: /* S */
213 addr = lookup(lf, symidx, 1);
214 if (addr == 0)
215 return -1;
216 if (*where != addr)
217 *where = addr;
218 break;
219
220 case R_386_RELATIVE:
221 break;
222
223 default:
224 printf("kldload: unexpected relocation type %d\n",
225 rtype);
226 return -1;
227 }
228 return(0);
229 }
230
231 int
232 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
233 elf_lookup_fn lookup)
234 {
235
236 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
237 }
238
239 int
240 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
241 int type, elf_lookup_fn lookup)
242 {
243
244 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
245 }
246
247 int
248 elf_cpu_load_file(linker_file_t lf __unused)
249 {
250
251 return (0);
252 }
253
254 int
255 elf_cpu_unload_file(linker_file_t lf __unused)
256 {
257
258 return (0);
259 }
Cache object: 9de3a4e9486c51987b17d06c1b2b0df5
|