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("$FreeBSD$");
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
111 void
112 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
113 size_t *off __unused)
114 {
115 }
116
117
118 /* Process one elf relocation with addend. */
119 static int
120 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
121 int type, int local, elf_lookup_fn lookup)
122 {
123 Elf_Addr *where;
124 Elf_Addr addr;
125 Elf_Addr addend;
126 Elf_Word rtype, symidx;
127 const Elf_Rel *rel;
128 const Elf_Rela *rela;
129
130 switch (type) {
131 case ELF_RELOC_REL:
132 rel = (const Elf_Rel *)data;
133 where = (Elf_Addr *) (relocbase + rel->r_offset);
134 addend = *where;
135 rtype = ELF_R_TYPE(rel->r_info);
136 symidx = ELF_R_SYM(rel->r_info);
137 break;
138 case ELF_RELOC_RELA:
139 rela = (const Elf_Rela *)data;
140 where = (Elf_Addr *) (relocbase + rela->r_offset);
141 addend = rela->r_addend;
142 rtype = ELF_R_TYPE(rela->r_info);
143 symidx = ELF_R_SYM(rela->r_info);
144 break;
145 default:
146 panic("unknown reloc type %d\n", type);
147 }
148
149 if (local) {
150 if (rtype == R_386_RELATIVE) { /* A + B */
151 addr = relocbase + addend;
152 if (*where != addr)
153 *where = addr;
154 }
155 return (0);
156 }
157
158 switch (rtype) {
159
160 case R_386_NONE: /* none */
161 break;
162
163 case R_386_32: /* S + A */
164 addr = lookup(lf, symidx, 1);
165 if (addr == 0)
166 return -1;
167 addr += addend;
168 if (*where != addr)
169 *where = addr;
170 break;
171
172 case R_386_PC32: /* S + A - P */
173 addr = lookup(lf, symidx, 1);
174 if (addr == 0)
175 return -1;
176 addr += addend - (Elf_Addr)where;
177 if (*where != addr)
178 *where = addr;
179 break;
180
181 case R_386_COPY: /* none */
182 /*
183 * There shouldn't be copy relocations in kernel
184 * objects.
185 */
186 printf("kldload: unexpected R_COPY relocation\n");
187 return -1;
188 break;
189
190 case R_386_GLOB_DAT: /* S */
191 addr = lookup(lf, symidx, 1);
192 if (addr == 0)
193 return -1;
194 if (*where != addr)
195 *where = addr;
196 break;
197
198 case R_386_RELATIVE:
199 break;
200
201 default:
202 printf("kldload: unexpected relocation type %d\n",
203 rtype);
204 return -1;
205 }
206 return(0);
207 }
208
209 int
210 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
211 elf_lookup_fn lookup)
212 {
213
214 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
215 }
216
217 int
218 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
219 int type, elf_lookup_fn lookup)
220 {
221
222 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
223 }
224
225 int
226 elf_cpu_load_file(linker_file_t lf __unused)
227 {
228
229 return (0);
230 }
231
232 int
233 elf_cpu_unload_file(linker_file_t lf __unused)
234 {
235
236 return (0);
237 }
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