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 * from: src/sys/i386/i386/elf_machdep.c,v 1.20 2004/08/11 02:35:05 marcel
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD: releng/10.4/sys/mips/mips/elf_machdep.c 294136 2016-01-16 07:56:49Z dchagin $");
30
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/systm.h>
34 #include <sys/exec.h>
35 #include <sys/imgact.h>
36 #include <sys/linker.h>
37 #include <sys/sysent.h>
38 #include <sys/imgact_elf.h>
39 #include <sys/proc.h>
40 #include <sys/syscall.h>
41 #include <sys/signalvar.h>
42 #include <sys/vnode.h>
43
44 #include <vm/vm.h>
45 #include <vm/pmap.h>
46 #include <vm/vm_param.h>
47
48 #include <machine/elf.h>
49 #include <machine/md_var.h>
50 #include <machine/cache.h>
51
52 #ifdef __mips_n64
53 struct sysentvec elf64_freebsd_sysvec = {
54 .sv_size = SYS_MAXSYSCALL,
55 .sv_table = sysent,
56 .sv_mask = 0,
57 .sv_sigsize = 0,
58 .sv_sigtbl = NULL,
59 .sv_errsize = 0,
60 .sv_errtbl = NULL,
61 .sv_transtrap = NULL,
62 .sv_fixup = __elfN(freebsd_fixup),
63 .sv_sendsig = sendsig,
64 .sv_sigcode = sigcode,
65 .sv_szsigcode = &szsigcode,
66 .sv_prepsyscall = NULL,
67 .sv_name = "FreeBSD ELF64",
68 .sv_coredump = __elfN(coredump),
69 .sv_imgact_try = NULL,
70 .sv_minsigstksz = MINSIGSTKSZ,
71 .sv_pagesize = PAGE_SIZE,
72 .sv_minuser = VM_MIN_ADDRESS,
73 .sv_maxuser = VM_MAXUSER_ADDRESS,
74 .sv_usrstack = USRSTACK,
75 .sv_psstrings = PS_STRINGS,
76 .sv_stackprot = VM_PROT_ALL,
77 .sv_copyout_strings = exec_copyout_strings,
78 .sv_setregs = exec_setregs,
79 .sv_fixlimit = NULL,
80 .sv_maxssiz = NULL,
81 .sv_flags = SV_ABI_FREEBSD | SV_LP64,
82 .sv_set_syscall_retval = cpu_set_syscall_retval,
83 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
84 .sv_syscallnames = syscallnames,
85 .sv_schedtail = NULL,
86 .sv_thread_detach = NULL,
87 .sv_trap = NULL,
88 };
89
90 static Elf64_Brandinfo freebsd_brand_info = {
91 .brand = ELFOSABI_FREEBSD,
92 .machine = EM_MIPS,
93 .compat_3_brand = "FreeBSD",
94 .emul_path = NULL,
95 .interp_path = "/libexec/ld-elf.so.1",
96 .sysvec = &elf64_freebsd_sysvec,
97 .interp_newpath = NULL,
98 .flags = 0
99 };
100
101 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
102 (sysinit_cfunc_t) elf64_insert_brand_entry,
103 &freebsd_brand_info);
104
105 void
106 elf64_dump_thread(struct thread *td __unused, void *dst __unused,
107 size_t *off __unused)
108 {
109 }
110 #else
111 struct sysentvec elf32_freebsd_sysvec = {
112 .sv_size = SYS_MAXSYSCALL,
113 .sv_table = sysent,
114 .sv_mask = 0,
115 .sv_sigsize = 0,
116 .sv_sigtbl = NULL,
117 .sv_errsize = 0,
118 .sv_errtbl = NULL,
119 .sv_transtrap = NULL,
120 .sv_fixup = __elfN(freebsd_fixup),
121 .sv_sendsig = sendsig,
122 .sv_sigcode = sigcode,
123 .sv_szsigcode = &szsigcode,
124 .sv_prepsyscall = NULL,
125 .sv_name = "FreeBSD ELF32",
126 .sv_coredump = __elfN(coredump),
127 .sv_imgact_try = NULL,
128 .sv_minsigstksz = MINSIGSTKSZ,
129 .sv_pagesize = PAGE_SIZE,
130 .sv_minuser = VM_MIN_ADDRESS,
131 .sv_maxuser = VM_MAXUSER_ADDRESS,
132 .sv_usrstack = USRSTACK,
133 .sv_psstrings = PS_STRINGS,
134 .sv_stackprot = VM_PROT_ALL,
135 .sv_copyout_strings = exec_copyout_strings,
136 .sv_setregs = exec_setregs,
137 .sv_fixlimit = NULL,
138 .sv_maxssiz = NULL,
139 .sv_flags = SV_ABI_FREEBSD | SV_ILP32,
140 .sv_set_syscall_retval = cpu_set_syscall_retval,
141 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
142 .sv_syscallnames = syscallnames,
143 .sv_schedtail = NULL,
144 .sv_thread_detach = NULL,
145 .sv_trap = NULL,
146 };
147
148 static Elf32_Brandinfo freebsd_brand_info = {
149 .brand = ELFOSABI_FREEBSD,
150 .machine = EM_MIPS,
151 .compat_3_brand = "FreeBSD",
152 .emul_path = NULL,
153 .interp_path = "/libexec/ld-elf.so.1",
154 .sysvec = &elf32_freebsd_sysvec,
155 .interp_newpath = NULL,
156 .flags = 0
157 };
158
159 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
160 (sysinit_cfunc_t) elf32_insert_brand_entry,
161 &freebsd_brand_info);
162
163 void
164 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
165 size_t *off __unused)
166 {
167 }
168 #endif
169
170 /* Process one elf relocation with addend. */
171 static int
172 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
173 int type, int local, elf_lookup_fn lookup)
174 {
175 Elf32_Addr *where = (Elf32_Addr *)NULL;
176 Elf_Addr addr;
177 Elf_Addr addend = (Elf_Addr)0;
178 Elf_Word rtype = (Elf_Word)0, symidx;
179 const Elf_Rel *rel = NULL;
180 const Elf_Rela *rela = NULL;
181 int error;
182
183 /*
184 * Stash R_MIPS_HI16 info so we can use it when processing R_MIPS_LO16
185 */
186 static Elf_Addr ahl;
187 static Elf32_Addr *where_hi16;
188
189 switch (type) {
190 case ELF_RELOC_REL:
191 rel = (const Elf_Rel *)data;
192 where = (Elf32_Addr *) (relocbase + rel->r_offset);
193 rtype = ELF_R_TYPE(rel->r_info);
194 symidx = ELF_R_SYM(rel->r_info);
195 switch (rtype) {
196 case R_MIPS_64:
197 addend = *(Elf64_Addr *)where;
198 break;
199 default:
200 addend = *where;
201 break;
202 }
203
204 break;
205 case ELF_RELOC_RELA:
206 rela = (const Elf_Rela *)data;
207 where = (Elf32_Addr *) (relocbase + rela->r_offset);
208 addend = rela->r_addend;
209 rtype = ELF_R_TYPE(rela->r_info);
210 symidx = ELF_R_SYM(rela->r_info);
211 break;
212 default:
213 panic("unknown reloc type %d\n", type);
214 }
215
216 switch (rtype) {
217 case R_MIPS_NONE: /* none */
218 break;
219
220 case R_MIPS_32: /* S + A */
221 error = lookup(lf, symidx, 1, &addr);
222 if (error != 0)
223 return (-1);
224 addr += addend;
225 if (*where != addr)
226 *where = (Elf32_Addr)addr;
227 break;
228
229 case R_MIPS_26: /* ((A << 2) | (P & 0xf0000000) + S) >> 2 */
230 error = lookup(lf, symidx, 1, &addr);
231 if (error != 0)
232 return (-1);
233
234 addend &= 0x03ffffff;
235 /*
236 * Addendum for .rela R_MIPS_26 is not shifted right
237 */
238 if (rela == NULL)
239 addend <<= 2;
240
241 addr += ((Elf_Addr)where & 0xf0000000) | addend;
242 addr >>= 2;
243
244 *where &= ~0x03ffffff;
245 *where |= addr & 0x03ffffff;
246 break;
247
248 case R_MIPS_64: /* S + A */
249 error = lookup(lf, symidx, 1, &addr);
250 if (error != 0)
251 return (-1);
252 addr += addend;
253 if (*(Elf64_Addr*)where != addr)
254 *(Elf64_Addr*)where = addr;
255 break;
256
257 case R_MIPS_HI16: /* ((AHL + S) - ((short)(AHL + S)) >> 16 */
258 if (rela != NULL) {
259 error = lookup(lf, symidx, 1, &addr);
260 if (error != 0)
261 return (-1);
262 addr += addend;
263 *where &= 0xffff0000;
264 *where |= ((((long long) addr + 0x8000LL) >> 16) & 0xffff);
265 }
266 else {
267 ahl = addend << 16;
268 where_hi16 = where;
269 }
270 break;
271
272 case R_MIPS_LO16: /* AHL + S */
273 if (rela != NULL) {
274 error = lookup(lf, symidx, 1, &addr);
275 if (error != 0)
276 return (-1);
277 addr += addend;
278 *where &= 0xffff0000;
279 *where |= addr & 0xffff;
280 }
281 else {
282 ahl += (int16_t)addend;
283 error = lookup(lf, symidx, 1, &addr);
284 if (error != 0)
285 return (-1);
286
287 addend &= 0xffff0000;
288 addend |= (uint16_t)(ahl + addr);
289 *where = addend;
290
291 addend = *where_hi16;
292 addend &= 0xffff0000;
293 addend |= ((ahl + addr) - (int16_t)(ahl + addr)) >> 16;
294 *where_hi16 = addend;
295 }
296
297 break;
298
299 case R_MIPS_HIGHER: /* %higher(A+S) */
300 error = lookup(lf, symidx, 1, &addr);
301 if (error != 0)
302 return (-1);
303 addr += addend;
304 *where &= 0xffff0000;
305 *where |= (((long long)addr + 0x80008000LL) >> 32) & 0xffff;
306 break;
307
308 case R_MIPS_HIGHEST: /* %highest(A+S) */
309 error = lookup(lf, symidx, 1, &addr);
310 if (error != 0)
311 return (-1);
312 addr += addend;
313 *where &= 0xffff0000;
314 *where |= (((long long)addr + 0x800080008000LL) >> 48) & 0xffff;
315 break;
316
317 default:
318 printf("kldload: unexpected relocation type %d\n",
319 rtype);
320 return (-1);
321 }
322
323 return(0);
324 }
325
326 int
327 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
328 elf_lookup_fn lookup)
329 {
330
331 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
332 }
333
334 int
335 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
336 int type, elf_lookup_fn lookup)
337 {
338
339 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
340 }
341
342 int
343 elf_cpu_load_file(linker_file_t lf __unused)
344 {
345
346 /*
347 * Sync the I and D caches to make sure our relocations are visible.
348 */
349 mips_icache_sync_all();
350
351 return (0);
352 }
353
354 int
355 elf_cpu_unload_file(linker_file_t lf __unused)
356 {
357
358 return (0);
359 }
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