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: releng/8.1/sys/arm/arm/elf_machdep.c 200165 2009-12-05 20:43:15Z bz $");
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 .brand_note = &elf32_freebsd_brandnote,
88 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
89 };
90
91 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
92 (sysinit_cfunc_t) elf32_insert_brand_entry,
93 &freebsd_brand_info);
94
95 static Elf32_Brandinfo freebsd_brand_oinfo = {
96 .brand = ELFOSABI_FREEBSD,
97 .machine = EM_ARM,
98 .compat_3_brand = "FreeBSD",
99 .emul_path = NULL,
100 .interp_path = "/usr/libexec/ld-elf.so.1",
101 .sysvec = &elf32_freebsd_sysvec,
102 .interp_newpath = NULL,
103 .brand_note = &elf32_freebsd_brandnote,
104 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
105 };
106
107 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
108 (sysinit_cfunc_t) elf32_insert_brand_entry,
109 &freebsd_brand_oinfo);
110
111
112 void
113 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
114 size_t *off __unused)
115 {
116 }
117
118
119 /* Process one elf relocation with addend. */
120 static int
121 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
122 int type, int local, elf_lookup_fn lookup)
123 {
124 Elf_Addr *where;
125 Elf_Addr addr;
126 Elf_Addr addend;
127 Elf_Word rtype, symidx;
128 const Elf_Rel *rel;
129 const Elf_Rela *rela;
130
131 switch (type) {
132 case ELF_RELOC_REL:
133 rel = (const Elf_Rel *)data;
134 where = (Elf_Addr *) (relocbase + rel->r_offset);
135 addend = *where;
136 rtype = ELF_R_TYPE(rel->r_info);
137 symidx = ELF_R_SYM(rel->r_info);
138 break;
139 case ELF_RELOC_RELA:
140 rela = (const Elf_Rela *)data;
141 where = (Elf_Addr *) (relocbase + rela->r_offset);
142 addend = rela->r_addend;
143 rtype = ELF_R_TYPE(rela->r_info);
144 symidx = ELF_R_SYM(rela->r_info);
145 break;
146 default:
147 panic("unknown reloc type %d\n", type);
148 }
149
150 if (local) {
151 if (rtype == R_ARM_RELATIVE) { /* A + B */
152 addr = elf_relocaddr(lf, relocbase + addend);
153 if (*where != addr)
154 *where = addr;
155 }
156 return (0);
157 }
158
159 switch (rtype) {
160
161 case R_ARM_NONE: /* none */
162 break;
163
164 case R_ARM_ABS32:
165 addr = lookup(lf, symidx, 1);
166 if (addr == 0)
167 return -1;
168 if (*where != addr)
169 *where = addr;
170
171 break;
172
173 case R_ARM_COPY: /* none */
174 /*
175 * There shouldn't be copy relocations in kernel
176 * objects.
177 */
178 printf("kldload: unexpected R_COPY relocation\n");
179 return -1;
180 break;
181
182 case R_ARM_JUMP_SLOT:
183 addr = lookup(lf, symidx, 1);
184 if (addr) {
185 *where = addr;
186 return (0);
187 }
188 return (-1);
189 case R_ARM_RELATIVE:
190 break;
191
192 default:
193 printf("kldload: unexpected relocation type %d\n",
194 rtype);
195 return -1;
196 }
197 return(0);
198 }
199
200 int
201 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
202 elf_lookup_fn lookup)
203 {
204
205 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
206 }
207
208 int
209 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
210 int type, elf_lookup_fn lookup)
211 {
212
213 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
214 }
215
216 int
217 elf_cpu_load_file(linker_file_t lf __unused)
218 {
219
220 cpu_idcache_wbinv_all();
221 cpu_l2cache_wbinv_all();
222 cpu_tlb_flushID();
223 return (0);
224 }
225
226 int
227 elf_cpu_unload_file(linker_file_t lf __unused)
228 {
229
230 return (0);
231 }
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