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/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 | SV_SHP,
78 .sv_set_syscall_retval = cpu_set_syscall_retval,
79 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
80 .sv_syscallnames = syscallnames,
81 .sv_shared_page_base = SHAREDPAGE,
82 .sv_shared_page_len = PAGE_SIZE,
83 .sv_schedtail = NULL,
84 };
85 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
86
87 static Elf32_Brandinfo freebsd_brand_info = {
88 .brand = ELFOSABI_FREEBSD,
89 .machine = EM_386,
90 .compat_3_brand = "FreeBSD",
91 .emul_path = NULL,
92 .interp_path = "/libexec/ld-elf.so.1",
93 .sysvec = &elf32_freebsd_sysvec,
94 .interp_newpath = NULL,
95 .brand_note = &elf32_freebsd_brandnote,
96 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
97 };
98
99 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
100 (sysinit_cfunc_t) elf32_insert_brand_entry,
101 &freebsd_brand_info);
102
103 static Elf32_Brandinfo freebsd_brand_oinfo = {
104 .brand = ELFOSABI_FREEBSD,
105 .machine = EM_386,
106 .compat_3_brand = "FreeBSD",
107 .emul_path = NULL,
108 .interp_path = "/usr/libexec/ld-elf.so.1",
109 .sysvec = &elf32_freebsd_sysvec,
110 .interp_newpath = NULL,
111 .brand_note = &elf32_freebsd_brandnote,
112 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
113 };
114
115 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
116 (sysinit_cfunc_t) elf32_insert_brand_entry,
117 &freebsd_brand_oinfo);
118
119 static Elf32_Brandinfo kfreebsd_brand_info = {
120 .brand = ELFOSABI_FREEBSD,
121 .machine = EM_386,
122 .compat_3_brand = "FreeBSD",
123 .emul_path = NULL,
124 .interp_path = "/lib/ld.so.1",
125 .sysvec = &elf32_freebsd_sysvec,
126 .interp_newpath = NULL,
127 .brand_note = &elf32_kfreebsd_brandnote,
128 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
129 };
130
131 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
132 (sysinit_cfunc_t) elf32_insert_brand_entry,
133 &kfreebsd_brand_info);
134
135
136 void
137 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
138 size_t *off __unused)
139 {
140 }
141
142
143 /* Process one elf relocation with addend. */
144 static int
145 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
146 int type, int local, elf_lookup_fn lookup)
147 {
148 Elf_Addr *where;
149 Elf_Addr addr;
150 Elf_Addr addend;
151 Elf_Word rtype, symidx;
152 const Elf_Rel *rel;
153 const Elf_Rela *rela;
154
155 switch (type) {
156 case ELF_RELOC_REL:
157 rel = (const Elf_Rel *)data;
158 where = (Elf_Addr *) (relocbase + rel->r_offset);
159 addend = *where;
160 rtype = ELF_R_TYPE(rel->r_info);
161 symidx = ELF_R_SYM(rel->r_info);
162 break;
163 case ELF_RELOC_RELA:
164 rela = (const Elf_Rela *)data;
165 where = (Elf_Addr *) (relocbase + rela->r_offset);
166 addend = rela->r_addend;
167 rtype = ELF_R_TYPE(rela->r_info);
168 symidx = ELF_R_SYM(rela->r_info);
169 break;
170 default:
171 panic("unknown reloc type %d\n", type);
172 }
173
174 if (local) {
175 if (rtype == R_386_RELATIVE) { /* A + B */
176 addr = elf_relocaddr(lf, relocbase + addend);
177 if (*where != addr)
178 *where = addr;
179 }
180 return (0);
181 }
182
183 switch (rtype) {
184
185 case R_386_NONE: /* none */
186 break;
187
188 case R_386_32: /* S + A */
189 addr = lookup(lf, symidx, 1);
190 if (addr == 0)
191 return -1;
192 addr += addend;
193 if (*where != addr)
194 *where = addr;
195 break;
196
197 case R_386_PC32: /* S + A - P */
198 addr = lookup(lf, symidx, 1);
199 if (addr == 0)
200 return -1;
201 addr += addend - (Elf_Addr)where;
202 if (*where != addr)
203 *where = addr;
204 break;
205
206 case R_386_COPY: /* none */
207 /*
208 * There shouldn't be copy relocations in kernel
209 * objects.
210 */
211 printf("kldload: unexpected R_COPY relocation\n");
212 return -1;
213 break;
214
215 case R_386_GLOB_DAT: /* S */
216 addr = lookup(lf, symidx, 1);
217 if (addr == 0)
218 return -1;
219 if (*where != addr)
220 *where = addr;
221 break;
222
223 case R_386_RELATIVE:
224 break;
225
226 default:
227 printf("kldload: unexpected relocation type %d\n",
228 rtype);
229 return -1;
230 }
231 return(0);
232 }
233
234 int
235 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
236 elf_lookup_fn lookup)
237 {
238
239 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
240 }
241
242 int
243 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
244 int type, elf_lookup_fn lookup)
245 {
246
247 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
248 }
249
250 int
251 elf_cpu_load_file(linker_file_t lf __unused)
252 {
253
254 return (0);
255 }
256
257 int
258 elf_cpu_unload_file(linker_file_t lf __unused)
259 {
260
261 return (0);
262 }
Cache object: f3804c384d232370e34596e8616f8949
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