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
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD: src/sys/arm/arm/elf_machdep.c,v 1.10 2008/11/22 12:36:15 kib Exp $");
28
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/systm.h>
32 #include <sys/exec.h>
33 #include <sys/imgact.h>
34 #include <sys/linker.h>
35 #include <sys/sysent.h>
36 #include <sys/imgact_elf.h>
37 #include <sys/syscall.h>
38 #include <sys/signalvar.h>
39 #include <sys/vnode.h>
40
41 #include <vm/vm.h>
42 #include <vm/pmap.h>
43 #include <vm/vm_param.h>
44
45 #include <machine/elf.h>
46 #include <machine/md_var.h>
47
48 struct sysentvec elf32_freebsd_sysvec = {
49 .sv_size = SYS_MAXSYSCALL,
50 .sv_table = sysent,
51 .sv_mask = 0,
52 .sv_sigsize = 0,
53 .sv_sigtbl = NULL,
54 .sv_errsize = 0,
55 .sv_errtbl = NULL,
56 .sv_transtrap = NULL,
57 .sv_fixup = __elfN(freebsd_fixup),
58 .sv_sendsig = sendsig,
59 .sv_sigcode = sigcode,
60 .sv_szsigcode = &szsigcode,
61 .sv_prepsyscall = NULL,
62 .sv_name = "FreeBSD ELF32",
63 .sv_coredump = __elfN(coredump),
64 .sv_imgact_try = NULL,
65 .sv_minsigstksz = MINSIGSTKSZ,
66 .sv_pagesize = PAGE_SIZE,
67 .sv_minuser = VM_MIN_ADDRESS,
68 .sv_maxuser = VM_MAXUSER_ADDRESS,
69 .sv_usrstack = USRSTACK,
70 .sv_psstrings = PS_STRINGS,
71 .sv_stackprot = VM_PROT_ALL,
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_ILP32
77 };
78
79 static Elf32_Brandinfo freebsd_brand_info = {
80 .brand = ELFOSABI_FREEBSD,
81 .machine = EM_ARM,
82 .compat_3_brand = "FreeBSD",
83 .emul_path = NULL,
84 .interp_path = "/libexec/ld-elf.so.1",
85 .sysvec = &elf32_freebsd_sysvec,
86 .interp_newpath = NULL,
87 .flags = BI_CAN_EXEC_DYN,
88 };
89
90 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY,
91 (sysinit_cfunc_t) elf32_insert_brand_entry,
92 &freebsd_brand_info);
93
94 static Elf32_Brandinfo freebsd_brand_oinfo = {
95 .brand = ELFOSABI_FREEBSD,
96 .machine = EM_ARM,
97 .compat_3_brand = "FreeBSD",
98 .emul_path = NULL,
99 .interp_path = "/usr/libexec/ld-elf.so.1",
100 .sysvec = &elf32_freebsd_sysvec,
101 .interp_newpath = NULL,
102 .flags = BI_CAN_EXEC_DYN,
103 };
104
105 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
106 (sysinit_cfunc_t) elf32_insert_brand_entry,
107 &freebsd_brand_oinfo);
108
109
110 void
111 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
112 size_t *off __unused)
113 {
114 }
115
116
117 /* Process one elf relocation with addend. */
118 static int
119 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
120 int type, int local, elf_lookup_fn lookup)
121 {
122 Elf_Addr *where;
123 Elf_Addr addr;
124 Elf_Addr addend;
125 Elf_Word rtype, symidx;
126 const Elf_Rel *rel;
127 const Elf_Rela *rela;
128
129 switch (type) {
130 case ELF_RELOC_REL:
131 rel = (const Elf_Rel *)data;
132 where = (Elf_Addr *) (relocbase + rel->r_offset);
133 addend = *where;
134 rtype = ELF_R_TYPE(rel->r_info);
135 symidx = ELF_R_SYM(rel->r_info);
136 break;
137 case ELF_RELOC_RELA:
138 rela = (const Elf_Rela *)data;
139 where = (Elf_Addr *) (relocbase + rela->r_offset);
140 addend = rela->r_addend;
141 rtype = ELF_R_TYPE(rela->r_info);
142 symidx = ELF_R_SYM(rela->r_info);
143 break;
144 default:
145 panic("unknown reloc type %d\n", type);
146 }
147
148 if (local) {
149 if (rtype == R_ARM_RELATIVE) { /* A + B */
150 addr = relocbase + addend;
151 if (*where != addr)
152 *where = addr;
153 }
154 return (0);
155 }
156
157 switch (rtype) {
158
159 case R_ARM_NONE: /* none */
160 break;
161
162 case R_ARM_ABS32:
163 addr = lookup(lf, symidx, 1);
164 if (addr == 0)
165 return -1;
166 if (*where != addr)
167 *where = addr;
168
169 break;
170
171 case R_ARM_COPY: /* none */
172 /*
173 * There shouldn't be copy relocations in kernel
174 * objects.
175 */
176 printf("kldload: unexpected R_COPY relocation\n");
177 return -1;
178 break;
179
180 case R_ARM_JUMP_SLOT:
181 addr = lookup(lf, symidx, 1);
182 if (addr) {
183 *where = addr;
184 return (0);
185 }
186 return (-1);
187 case R_ARM_RELATIVE:
188 break;
189
190 default:
191 printf("kldload: unexpected relocation type %d\n",
192 rtype);
193 return -1;
194 }
195 return(0);
196 }
197
198 int
199 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
200 elf_lookup_fn lookup)
201 {
202
203 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
204 }
205
206 int
207 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
208 int type, elf_lookup_fn lookup)
209 {
210
211 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
212 }
213
214 int
215 elf_cpu_load_file(linker_file_t lf __unused)
216 {
217
218 cpu_idcache_wbinv_all();
219 cpu_l2cache_wbinv_all();
220 cpu_tlb_flushID();
221 return (0);
222 }
223
224 int
225 elf_cpu_unload_file(linker_file_t lf __unused)
226 {
227
228 return (0);
229 }
230 Cache object: 2359c9be1b2cfcd3fe39b59e381f4f01
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