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/9.0/sys/mips/mips/elf_machdep.c 219405 2011-03-08 19:01:45Z 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 = NULL, /* XXXKIB */
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
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 = NULL, /* XXXKIB */
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
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
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 Elf_Addr *where = (Elf_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;
176
177 /*
178 * Stash R_MIPS_HI16 info so we can use it when processing R_MIPS_LO16
179 */
180 static Elf_Addr ahl;
181 static Elf_Addr *where_hi16;
182
183 switch (type) {
184 case ELF_RELOC_REL:
185 rel = (const Elf_Rel *)data;
186 where = (Elf_Addr *) (relocbase + rel->r_offset);
187 addend = *where;
188 rtype = ELF_R_TYPE(rel->r_info);
189 symidx = ELF_R_SYM(rel->r_info);
190 break;
191 default:
192 panic("unknown reloc type %d\n", type);
193 }
194
195 switch (rtype) {
196 case R_MIPS_NONE: /* none */
197 break;
198
199 case R_MIPS_32: /* S + A */
200 addr = lookup(lf, symidx, 1);
201 if (addr == 0)
202 return (-1);
203 addr += addend;
204 if (*where != addr)
205 *where = addr;
206 break;
207
208 case R_MIPS_26: /* ((A << 2) | (P & 0xf0000000) + S) >> 2 */
209 addr = lookup(lf, symidx, 1);
210 if (addr == 0)
211 return (-1);
212
213 addend &= 0x03ffffff;
214 addend <<= 2;
215
216 addr += ((Elf_Addr)where & 0xf0000000) | addend;
217 addr >>= 2;
218
219 *where &= ~0x03ffffff;
220 *where |= addr & 0x03ffffff;
221 break;
222
223 case R_MIPS_HI16: /* ((AHL + S) - ((short)(AHL + S)) >> 16 */
224 ahl = addend << 16;
225 where_hi16 = where;
226 break;
227
228 case R_MIPS_LO16: /* AHL + S */
229 ahl += (int16_t)addend;
230 addr = lookup(lf, symidx, 1);
231 if (addr == 0)
232 return (-1);
233
234 addend &= 0xffff0000;
235 addend |= (uint16_t)(ahl + addr);
236 *where = addend;
237
238 addend = *where_hi16;
239 addend &= 0xffff0000;
240 addend |= ((ahl + addr) - (int16_t)(ahl + addr)) >> 16;
241 *where_hi16 = addend;
242 break;
243
244 default:
245 printf("kldload: unexpected relocation type %d\n",
246 rtype);
247 return (-1);
248 }
249 return(0);
250 }
251
252 int
253 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
254 elf_lookup_fn lookup)
255 {
256
257 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
258 }
259
260 int
261 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
262 int type, elf_lookup_fn lookup)
263 {
264
265 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
266 }
267
268 int
269 elf_cpu_load_file(linker_file_t lf __unused)
270 {
271
272 /*
273 * Sync the I and D caches to make sure our relocations are visible.
274 */
275 mips_icache_sync_all();
276
277 return (0);
278 }
279
280 int
281 elf_cpu_unload_file(linker_file_t lf __unused)
282 {
283
284 return (0);
285 }
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