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