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/9.1/sys/arm/arm/elf_machdep.c 229373 2012-01-03 09:40:31Z kib $");
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/proc.h>
38 #include <sys/syscall.h>
39 #include <sys/signalvar.h>
40 #include <sys/vnode.h>
41
42 #include <vm/vm.h>
43 #include <vm/pmap.h>
44 #include <vm/vm_param.h>
45
46 #include <machine/elf.h>
47 #include <machine/md_var.h>
48
49 struct sysentvec elf32_freebsd_sysvec = {
50 .sv_size = SYS_MAXSYSCALL,
51 .sv_table = sysent,
52 .sv_mask = 0,
53 .sv_sigsize = 0,
54 .sv_sigtbl = NULL,
55 .sv_errsize = 0,
56 .sv_errtbl = NULL,
57 .sv_transtrap = NULL,
58 .sv_fixup = __elfN(freebsd_fixup),
59 .sv_sendsig = sendsig,
60 .sv_sigcode = sigcode,
61 .sv_szsigcode = &szsigcode,
62 .sv_prepsyscall = NULL,
63 .sv_name = "FreeBSD ELF32",
64 .sv_coredump = __elfN(coredump),
65 .sv_imgact_try = NULL,
66 .sv_minsigstksz = MINSIGSTKSZ,
67 .sv_pagesize = PAGE_SIZE,
68 .sv_minuser = VM_MIN_ADDRESS,
69 .sv_maxuser = VM_MAXUSER_ADDRESS,
70 .sv_usrstack = USRSTACK,
71 .sv_psstrings = PS_STRINGS,
72 .sv_stackprot = VM_PROT_ALL,
73 .sv_copyout_strings = exec_copyout_strings,
74 .sv_setregs = exec_setregs,
75 .sv_fixlimit = NULL,
76 .sv_maxssiz = NULL,
77 .sv_flags = SV_ABI_FREEBSD | SV_ILP32,
78 .sv_set_syscall_retval = cpu_set_syscall_retval,
79 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
80 .sv_syscallnames = syscallnames,
81 .sv_schedtail = NULL,
82 };
83
84 static Elf32_Brandinfo freebsd_brand_info = {
85 .brand = ELFOSABI_FREEBSD,
86 .machine = EM_ARM,
87 .compat_3_brand = "FreeBSD",
88 .emul_path = NULL,
89 .interp_path = "/libexec/ld-elf.so.1",
90 .sysvec = &elf32_freebsd_sysvec,
91 .interp_newpath = NULL,
92 .brand_note = &elf32_freebsd_brandnote,
93 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
94 };
95
96 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
97 (sysinit_cfunc_t) elf32_insert_brand_entry,
98 &freebsd_brand_info);
99
100 static Elf32_Brandinfo freebsd_brand_oinfo = {
101 .brand = ELFOSABI_FREEBSD,
102 .machine = EM_ARM,
103 .compat_3_brand = "FreeBSD",
104 .emul_path = NULL,
105 .interp_path = "/usr/libexec/ld-elf.so.1",
106 .sysvec = &elf32_freebsd_sysvec,
107 .interp_newpath = NULL,
108 .brand_note = &elf32_freebsd_brandnote,
109 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
110 };
111
112 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
113 (sysinit_cfunc_t) elf32_insert_brand_entry,
114 &freebsd_brand_oinfo);
115
116
117 void
118 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
119 size_t *off __unused)
120 {
121 }
122
123
124 /* Process one elf relocation with addend. */
125 static int
126 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
127 int type, int local, elf_lookup_fn lookup)
128 {
129 Elf_Addr *where;
130 Elf_Addr addr;
131 Elf_Addr addend;
132 Elf_Word rtype, symidx;
133 const Elf_Rel *rel;
134 const Elf_Rela *rela;
135
136 switch (type) {
137 case ELF_RELOC_REL:
138 rel = (const Elf_Rel *)data;
139 where = (Elf_Addr *) (relocbase + rel->r_offset);
140 addend = *where;
141 rtype = ELF_R_TYPE(rel->r_info);
142 symidx = ELF_R_SYM(rel->r_info);
143 break;
144 case ELF_RELOC_RELA:
145 rela = (const Elf_Rela *)data;
146 where = (Elf_Addr *) (relocbase + rela->r_offset);
147 addend = rela->r_addend;
148 rtype = ELF_R_TYPE(rela->r_info);
149 symidx = ELF_R_SYM(rela->r_info);
150 break;
151 default:
152 panic("unknown reloc type %d\n", type);
153 }
154
155 if (local) {
156 if (rtype == R_ARM_RELATIVE) { /* A + B */
157 addr = elf_relocaddr(lf, relocbase + addend);
158 if (*where != addr)
159 *where = addr;
160 }
161 return (0);
162 }
163
164 switch (rtype) {
165
166 case R_ARM_NONE: /* none */
167 break;
168
169 case R_ARM_ABS32:
170 addr = lookup(lf, symidx, 1);
171 if (addr == 0)
172 return -1;
173 *where += addr;
174 break;
175
176 case R_ARM_COPY: /* none */
177 /*
178 * There shouldn't be copy relocations in kernel
179 * objects.
180 */
181 printf("kldload: unexpected R_COPY relocation\n");
182 return -1;
183 break;
184
185 case R_ARM_JUMP_SLOT:
186 addr = lookup(lf, symidx, 1);
187 if (addr) {
188 *where = addr;
189 return (0);
190 }
191 return (-1);
192 case R_ARM_RELATIVE:
193 break;
194
195 default:
196 printf("kldload: unexpected relocation type %d\n",
197 rtype);
198 return -1;
199 }
200 return(0);
201 }
202
203 int
204 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
205 elf_lookup_fn lookup)
206 {
207
208 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
209 }
210
211 int
212 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
213 int type, elf_lookup_fn lookup)
214 {
215
216 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
217 }
218
219 int
220 elf_cpu_load_file(linker_file_t lf __unused)
221 {
222
223 cpu_idcache_wbinv_all();
224 cpu_l2cache_wbinv_all();
225 cpu_tlb_flushID();
226 return (0);
227 }
228
229 int
230 elf_cpu_unload_file(linker_file_t lf __unused)
231 {
232
233 return (0);
234 }
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