1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright 1996-1998 John D. Polstra.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include "opt_cpu.h"
32
33 #include <sys/param.h>
34 #include <sys/kernel.h>
35 #include <sys/systm.h>
36 #include <sys/exec.h>
37 #include <sys/imgact.h>
38 #include <sys/linker.h>
39 #include <sys/proc.h>
40 #include <sys/sysent.h>
41 #include <sys/imgact_elf.h>
42 #include <sys/syscall.h>
43 #include <sys/signalvar.h>
44 #include <sys/vnode.h>
45
46 #include <vm/vm.h>
47 #include <vm/pmap.h>
48 #include <vm/vm_param.h>
49
50 #include <machine/elf.h>
51 #include <machine/md_var.h>
52 #include <machine/npx.h>
53
54 struct sysentvec elf32_freebsd_sysvec = {
55 .sv_size = SYS_MAXSYSCALL,
56 .sv_table = sysent,
57 .sv_transtrap = NULL,
58 .sv_fixup = __elfN(freebsd_fixup),
59 .sv_sendsig = sendsig,
60 .sv_sigcode = sigcode,
61 .sv_szsigcode = &szsigcode,
62 .sv_name = "FreeBSD ELF32",
63 .sv_coredump = __elfN(coredump),
64 .sv_imgact_try = NULL,
65 .sv_minsigstksz = MINSIGSTKSZ,
66 .sv_minuser = VM_MIN_ADDRESS,
67 .sv_maxuser = VM_MAXUSER_ADDRESS,
68 .sv_usrstack = USRSTACK,
69 .sv_psstrings = PS_STRINGS,
70 .sv_stackprot = VM_PROT_ALL,
71 .sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs),
72 .sv_copyout_strings = exec_copyout_strings,
73 .sv_setregs = exec_setregs,
74 .sv_fixlimit = NULL,
75 .sv_maxssiz = NULL,
76 .sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_IA32 | SV_ILP32 |
77 SV_SHP | SV_TIMEKEEP | SV_RNG_SEED_VER,
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 .sv_thread_detach = NULL,
85 .sv_trap = NULL,
86 };
87 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
88
89 static Elf32_Brandinfo freebsd_brand_info = {
90 .brand = ELFOSABI_FREEBSD,
91 .machine = EM_386,
92 .compat_3_brand = "FreeBSD",
93 .emul_path = NULL,
94 .interp_path = "/libexec/ld-elf.so.1",
95 .sysvec = &elf32_freebsd_sysvec,
96 .interp_newpath = NULL,
97 .brand_note = &elf32_freebsd_brandnote,
98 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
99 };
100
101 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
102 (sysinit_cfunc_t) elf32_insert_brand_entry,
103 &freebsd_brand_info);
104
105 static Elf32_Brandinfo freebsd_brand_oinfo = {
106 .brand = ELFOSABI_FREEBSD,
107 .machine = EM_386,
108 .compat_3_brand = "FreeBSD",
109 .emul_path = NULL,
110 .interp_path = "/usr/libexec/ld-elf.so.1",
111 .sysvec = &elf32_freebsd_sysvec,
112 .interp_newpath = NULL,
113 .brand_note = &elf32_freebsd_brandnote,
114 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
115 };
116
117 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
118 (sysinit_cfunc_t) elf32_insert_brand_entry,
119 &freebsd_brand_oinfo);
120
121 static Elf32_Brandinfo kfreebsd_brand_info = {
122 .brand = ELFOSABI_FREEBSD,
123 .machine = EM_386,
124 .compat_3_brand = "FreeBSD",
125 .emul_path = NULL,
126 .interp_path = "/lib/ld.so.1",
127 .sysvec = &elf32_freebsd_sysvec,
128 .interp_newpath = NULL,
129 .brand_note = &elf32_kfreebsd_brandnote,
130 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
131 };
132
133 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
134 (sysinit_cfunc_t) elf32_insert_brand_entry,
135 &kfreebsd_brand_info);
136
137 void
138 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
139 {
140 void *buf;
141 size_t len;
142
143 len = 0;
144 if (use_xsave) {
145 if (dst != NULL) {
146 npxgetregs(td);
147 len += elf32_populate_note(NT_X86_XSTATE,
148 get_pcb_user_save_td(td), dst,
149 cpu_max_ext_state_size, &buf);
150 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
151 xsave_mask;
152 } else
153 len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
154 cpu_max_ext_state_size, NULL);
155 }
156 *off = len;
157 }
158
159 bool
160 elf_is_ifunc_reloc(Elf_Size r_info)
161 {
162
163 return (ELF_R_TYPE(r_info) == R_386_IRELATIVE);
164 }
165
166 #define ERI_LOCAL 0x0001
167
168 /* Process one elf relocation with addend. */
169 static int
170 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
171 int type, elf_lookup_fn lookup, int flags)
172 {
173 Elf_Addr *where;
174 Elf_Addr addr;
175 Elf_Addr addend;
176 Elf_Word rtype, symidx;
177 const Elf_Rel *rel;
178 const Elf_Rela *rela;
179 int error;
180
181 switch (type) {
182 case ELF_RELOC_REL:
183 rel = (const Elf_Rel *)data;
184 where = (Elf_Addr *) (relocbase + rel->r_offset);
185 addend = *where;
186 rtype = ELF_R_TYPE(rel->r_info);
187 symidx = ELF_R_SYM(rel->r_info);
188 break;
189 case ELF_RELOC_RELA:
190 rela = (const Elf_Rela *)data;
191 where = (Elf_Addr *) (relocbase + rela->r_offset);
192 addend = rela->r_addend;
193 rtype = ELF_R_TYPE(rela->r_info);
194 symidx = ELF_R_SYM(rela->r_info);
195 break;
196 default:
197 panic("unknown reloc type %d\n", type);
198 }
199
200 if ((flags & ERI_LOCAL) != 0) {
201 if (rtype == R_386_RELATIVE) { /* A + B */
202 addr = elf_relocaddr(lf, relocbase + addend);
203 if (*where != addr)
204 *where = addr;
205 }
206 return (0);
207 }
208
209 switch (rtype) {
210 case R_386_NONE: /* none */
211 break;
212
213 case R_386_32: /* S + A */
214 error = lookup(lf, symidx, 1, &addr);
215 if (error != 0)
216 return (-1);
217 addr += addend;
218 if (*where != addr)
219 *where = addr;
220 break;
221
222 case R_386_PC32: /* S + A - P */
223 error = lookup(lf, symidx, 1, &addr);
224 if (error != 0)
225 return (-1);
226 addr += addend - (Elf_Addr)where;
227 if (*where != addr)
228 *where = addr;
229 break;
230
231 case R_386_COPY: /* none */
232 /*
233 * There shouldn't be copy relocations in kernel
234 * objects.
235 */
236 printf("kldload: unexpected R_COPY relocation, "
237 "symbol index %d\n", symidx);
238 return (-1);
239 break;
240
241 case R_386_GLOB_DAT: /* S */
242 error = lookup(lf, symidx, 1, &addr);
243 if (error != 0)
244 return (-1);
245 if (*where != addr)
246 *where = addr;
247 break;
248
249 case R_386_RELATIVE:
250 break;
251
252 case R_386_IRELATIVE:
253 addr = relocbase + addend;
254 addr = ((Elf_Addr (*)(void))addr)();
255 if (*where != addr)
256 *where = addr;
257 break;
258 default:
259 printf("kldload: unexpected relocation type %d, "
260 "symbol index %d\n", rtype, symidx);
261 return (-1);
262 }
263 return(0);
264 }
265
266 int
267 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
268 elf_lookup_fn lookup)
269 {
270
271 return (elf_reloc_internal(lf, relocbase, data, type, lookup, 0));
272 }
273
274 int
275 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
276 int type, elf_lookup_fn lookup)
277 {
278
279 return (elf_reloc_internal(lf, relocbase, data, type, lookup,
280 ERI_LOCAL));
281 }
282
283 int
284 elf_cpu_load_file(linker_file_t lf __unused)
285 {
286
287 return (0);
288 }
289
290 int
291 elf_cpu_unload_file(linker_file_t lf __unused)
292 {
293
294 return (0);
295 }
296
297 int
298 elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused)
299 {
300
301 return (0);
302 }
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