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_schedtail = NULL,
83 };
84
85 static Elf64_Brandinfo freebsd_brand_info = {
86 .brand = ELFOSABI_FREEBSD,
87 .machine = EM_MIPS,
88 .compat_3_brand = "FreeBSD",
89 .emul_path = NULL,
90 .interp_path = "/libexec/ld-elf.so.1",
91 .sysvec = &elf64_freebsd_sysvec,
92 .interp_newpath = NULL,
93 .flags = 0
94 };
95
96 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
97 (sysinit_cfunc_t) elf64_insert_brand_entry,
98 &freebsd_brand_info);
99
100 void
101 elf64_dump_thread(struct thread *td __unused, void *dst __unused,
102 size_t *off __unused)
103 {
104 }
105 #else
106 struct sysentvec elf32_freebsd_sysvec = {
107 .sv_size = SYS_MAXSYSCALL,
108 .sv_table = sysent,
109 .sv_mask = 0,
110 .sv_sigsize = 0,
111 .sv_sigtbl = NULL,
112 .sv_errsize = 0,
113 .sv_errtbl = NULL,
114 .sv_transtrap = NULL,
115 .sv_fixup = __elfN(freebsd_fixup),
116 .sv_sendsig = sendsig,
117 .sv_sigcode = sigcode,
118 .sv_szsigcode = &szsigcode,
119 .sv_prepsyscall = NULL,
120 .sv_name = "FreeBSD ELF32",
121 .sv_coredump = __elfN(coredump),
122 .sv_imgact_try = NULL,
123 .sv_minsigstksz = MINSIGSTKSZ,
124 .sv_pagesize = PAGE_SIZE,
125 .sv_minuser = VM_MIN_ADDRESS,
126 .sv_maxuser = VM_MAXUSER_ADDRESS,
127 .sv_usrstack = USRSTACK,
128 .sv_psstrings = PS_STRINGS,
129 .sv_stackprot = VM_PROT_ALL,
130 .sv_copyout_strings = exec_copyout_strings,
131 .sv_setregs = exec_setregs,
132 .sv_fixlimit = NULL,
133 .sv_maxssiz = NULL,
134 .sv_flags = SV_ABI_FREEBSD | SV_ILP32,
135 .sv_set_syscall_retval = cpu_set_syscall_retval,
136 .sv_fetch_syscall_args = NULL, /* XXXKIB */
137 .sv_syscallnames = syscallnames,
138 .sv_schedtail = NULL,
139 };
140
141 static Elf32_Brandinfo freebsd_brand_info = {
142 .brand = ELFOSABI_FREEBSD,
143 .machine = EM_MIPS,
144 .compat_3_brand = "FreeBSD",
145 .emul_path = NULL,
146 .interp_path = "/libexec/ld-elf.so.1",
147 .sysvec = &elf32_freebsd_sysvec,
148 .interp_newpath = NULL,
149 .flags = 0
150 };
151
152 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
153 (sysinit_cfunc_t) elf32_insert_brand_entry,
154 &freebsd_brand_info);
155
156 void
157 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
158 size_t *off __unused)
159 {
160 }
161 #endif
162
163 /* Process one elf relocation with addend. */
164 static int
165 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
166 int type, int local, elf_lookup_fn lookup)
167 {
168 Elf_Addr *where = (Elf_Addr *)NULL;
169 Elf_Addr addr;
170 Elf_Addr addend = (Elf_Addr)0;
171 Elf_Word rtype = (Elf_Word)0, symidx;
172 const Elf_Rel *rel;
173
174 /*
175 * Stash R_MIPS_HI16 info so we can use it when processing R_MIPS_LO16
176 */
177 static Elf_Addr ahl;
178 static Elf_Addr *where_hi16;
179
180 switch (type) {
181 case ELF_RELOC_REL:
182 rel = (const Elf_Rel *)data;
183 where = (Elf_Addr *) (relocbase + rel->r_offset);
184 addend = *where;
185 rtype = ELF_R_TYPE(rel->r_info);
186 symidx = ELF_R_SYM(rel->r_info);
187 break;
188 default:
189 panic("unknown reloc type %d\n", type);
190 }
191
192 switch (rtype) {
193 case R_MIPS_NONE: /* none */
194 break;
195
196 case R_MIPS_32: /* S + A */
197 addr = lookup(lf, symidx, 1);
198 if (addr == 0)
199 return (-1);
200 addr += addend;
201 if (*where != addr)
202 *where = addr;
203 break;
204
205 case R_MIPS_26: /* ((A << 2) | (P & 0xf0000000) + S) >> 2 */
206 addr = lookup(lf, symidx, 1);
207 if (addr == 0)
208 return (-1);
209
210 addend &= 0x03ffffff;
211 addend <<= 2;
212
213 addr += ((Elf_Addr)where & 0xf0000000) | addend;
214 addr >>= 2;
215
216 *where &= ~0x03ffffff;
217 *where |= addr & 0x03ffffff;
218 break;
219
220 case R_MIPS_HI16: /* ((AHL + S) - ((short)(AHL + S)) >> 16 */
221 ahl = addend << 16;
222 where_hi16 = where;
223 break;
224
225 case R_MIPS_LO16: /* AHL + S */
226 ahl += (int16_t)addend;
227 addr = lookup(lf, symidx, 1);
228 if (addr == 0)
229 return (-1);
230
231 addend &= 0xffff0000;
232 addend |= (uint16_t)(ahl + addr);
233 *where = addend;
234
235 addend = *where_hi16;
236 addend &= 0xffff0000;
237 addend |= ((ahl + addr) - (int16_t)(ahl + addr)) >> 16;
238 *where_hi16 = addend;
239 break;
240
241 default:
242 printf("kldload: unexpected relocation type %d\n",
243 rtype);
244 return (-1);
245 }
246 return(0);
247 }
248
249 int
250 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
251 elf_lookup_fn lookup)
252 {
253
254 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
255 }
256
257 int
258 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
259 int type, elf_lookup_fn lookup)
260 {
261
262 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
263 }
264
265 int
266 elf_cpu_load_file(linker_file_t lf __unused)
267 {
268
269 /*
270 * Sync the I and D caches to make sure our relocations are visible.
271 */
272 mips_icache_sync_all();
273
274 return (0);
275 }
276
277 int
278 elf_cpu_unload_file(linker_file_t lf __unused)
279 {
280
281 return (0);
282 }
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