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/7.3/sys/i386/i386/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/signalvar.h>
39 #include <sys/vnode.h>
40
41 #include <vm/vm.h>
42 #include <vm/pmap.h>
43 #include <vm/vm_param.h>
44
45 #include <machine/elf.h>
46 #include <machine/md_var.h>
47
48 struct sysentvec elf32_freebsd_sysvec = {
49 .sv_size = SYS_MAXSYSCALL,
50 .sv_table = sysent,
51 .sv_mask = 0,
52 .sv_sigsize = 0,
53 .sv_sigtbl = NULL,
54 .sv_errsize = 0,
55 .sv_errtbl = NULL,
56 .sv_transtrap = NULL,
57 .sv_fixup = __elfN(freebsd_fixup),
58 .sv_sendsig = sendsig,
59 .sv_sigcode = sigcode,
60 .sv_szsigcode = &szsigcode,
61 .sv_prepsyscall = NULL,
62 .sv_name = "FreeBSD ELF32",
63 .sv_coredump = __elfN(coredump),
64 .sv_imgact_try = NULL,
65 .sv_minsigstksz = MINSIGSTKSZ,
66 .sv_pagesize = PAGE_SIZE,
67 .sv_minuser = VM_MIN_ADDRESS,
68 .sv_maxuser = VM_MAXUSER_ADDRESS,
69 .sv_usrstack = USRSTACK,
70 .sv_psstrings = PS_STRINGS,
71 .sv_stackprot = VM_PROT_ALL,
72 .sv_copyout_strings = exec_copyout_strings,
73 .sv_setregs = exec_setregs,
74 .sv_fixlimit = NULL,
75 .sv_maxssiz = NULL
76 };
77
78 static Elf32_Brandinfo freebsd_brand_info = {
79 .brand = ELFOSABI_FREEBSD,
80 .machine = EM_386,
81 .compat_3_brand = "FreeBSD",
82 .emul_path = NULL,
83 .interp_path = "/libexec/ld-elf.so.1",
84 .sysvec = &elf32_freebsd_sysvec,
85 .interp_newpath = NULL,
86 .brand_note = &elf32_freebsd_brandnote,
87 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
88 };
89
90 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY,
91 (sysinit_cfunc_t) elf32_insert_brand_entry,
92 &freebsd_brand_info);
93
94 static Elf32_Brandinfo freebsd_brand_oinfo = {
95 .brand = ELFOSABI_FREEBSD,
96 .machine = EM_386,
97 .compat_3_brand = "FreeBSD",
98 .emul_path = NULL,
99 .interp_path = "/usr/libexec/ld-elf.so.1",
100 .sysvec = &elf32_freebsd_sysvec,
101 .interp_newpath = NULL,
102 .brand_note = &elf32_freebsd_brandnote,
103 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
104 };
105
106 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
107 (sysinit_cfunc_t) elf32_insert_brand_entry,
108 &freebsd_brand_oinfo);
109
110 static Elf32_Brandinfo kfreebsd_brand_info = {
111 .brand = ELFOSABI_FREEBSD,
112 .machine = EM_386,
113 .compat_3_brand = "FreeBSD",
114 .emul_path = NULL,
115 .interp_path = "/lib/ld.so.1",
116 .sysvec = &elf32_freebsd_sysvec,
117 .interp_newpath = NULL,
118 .brand_note = &elf32_kfreebsd_brandnote,
119 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
120 };
121
122 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
123 (sysinit_cfunc_t) elf32_insert_brand_entry,
124 &kfreebsd_brand_info);
125
126
127 void
128 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
129 size_t *off __unused)
130 {
131 }
132
133
134 /* Process one elf relocation with addend. */
135 static int
136 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
137 int type, int local, elf_lookup_fn lookup)
138 {
139 Elf_Addr *where;
140 Elf_Addr addr;
141 Elf_Addr addend;
142 Elf_Word rtype, symidx;
143 const Elf_Rel *rel;
144 const Elf_Rela *rela;
145
146 switch (type) {
147 case ELF_RELOC_REL:
148 rel = (const Elf_Rel *)data;
149 where = (Elf_Addr *) (relocbase + rel->r_offset);
150 addend = *where;
151 rtype = ELF_R_TYPE(rel->r_info);
152 symidx = ELF_R_SYM(rel->r_info);
153 break;
154 case ELF_RELOC_RELA:
155 rela = (const Elf_Rela *)data;
156 where = (Elf_Addr *) (relocbase + rela->r_offset);
157 addend = rela->r_addend;
158 rtype = ELF_R_TYPE(rela->r_info);
159 symidx = ELF_R_SYM(rela->r_info);
160 break;
161 default:
162 panic("unknown reloc type %d\n", type);
163 }
164
165 if (local) {
166 if (rtype == R_386_RELATIVE) { /* A + B */
167 addr = relocbase + addend;
168 if (*where != addr)
169 *where = addr;
170 }
171 return (0);
172 }
173
174 switch (rtype) {
175
176 case R_386_NONE: /* none */
177 break;
178
179 case R_386_32: /* S + A */
180 addr = lookup(lf, symidx, 1);
181 if (addr == 0)
182 return -1;
183 addr += addend;
184 if (*where != addr)
185 *where = addr;
186 break;
187
188 case R_386_PC32: /* S + A - P */
189 addr = lookup(lf, symidx, 1);
190 if (addr == 0)
191 return -1;
192 addr += addend - (Elf_Addr)where;
193 if (*where != addr)
194 *where = addr;
195 break;
196
197 case R_386_COPY: /* none */
198 /*
199 * There shouldn't be copy relocations in kernel
200 * objects.
201 */
202 printf("kldload: unexpected R_COPY relocation\n");
203 return -1;
204 break;
205
206 case R_386_GLOB_DAT: /* S */
207 addr = lookup(lf, symidx, 1);
208 if (addr == 0)
209 return -1;
210 if (*where != addr)
211 *where = addr;
212 break;
213
214 case R_386_RELATIVE:
215 break;
216
217 default:
218 printf("kldload: unexpected relocation type %d\n",
219 rtype);
220 return -1;
221 }
222 return(0);
223 }
224
225 int
226 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
227 elf_lookup_fn lookup)
228 {
229
230 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
231 }
232
233 int
234 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
235 int type, elf_lookup_fn lookup)
236 {
237
238 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
239 }
240
241 int
242 elf_cpu_load_file(linker_file_t lf __unused)
243 {
244
245 return (0);
246 }
247
248 int
249 elf_cpu_unload_file(linker_file_t lf __unused)
250 {
251
252 return (0);
253 }
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