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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/i386/i386/elf_machdep.c 115683 2003-06-02 06:43:15Z obrien $");
29
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/systm.h>
33#include <sys/exec.h>
34#include <sys/imgact.h>
35#include <sys/linker.h>
36#include <sys/sysent.h>
37#include <sys/imgact_elf.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
49struct sysentvec elf32_freebsd_sysvec = {
50 SYS_MAXSYSCALL,
51 sysent,
52 0,
53 0,
54 NULL,
55 0,
56 NULL,
57 NULL,
58 __elfN(freebsd_fixup),
59 sendsig,
60 sigcode,
61 &szsigcode,
62 NULL,
63 "FreeBSD ELF32",
64 __elfN(coredump),
65 NULL,
66 MINSIGSTKSZ,
67 PAGE_SIZE,
68 VM_MIN_ADDRESS,
69 VM_MAXUSER_ADDRESS,
70 USRSTACK,
71 PS_STRINGS,
72 VM_PROT_ALL,
73 exec_copyout_strings,
74 exec_setregs
75};
76
77static Elf32_Brandinfo freebsd_brand_info = {
78 ELFOSABI_FREEBSD,
79 EM_386,
80 "FreeBSD",
81 "",
82 "/usr/libexec/ld-elf.so.1",
83 &elf32_freebsd_sysvec
84 };
85
86SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY,
87 (sysinit_cfunc_t) elf32_insert_brand_entry,
88 &freebsd_brand_info);
89
90/* Process one elf relocation with addend. */
91static int
92elf_reloc_internal(linker_file_t lf, const void *data, int type, int local)
93{
94 Elf_Addr relocbase = (Elf_Addr) lf->address;
95 Elf_Addr *where;
96 Elf_Addr addr;
97 Elf_Addr addend;
98 Elf_Word rtype, symidx;
99 const Elf_Rel *rel;
100 const Elf_Rela *rela;
101
102 switch (type) {
103 case ELF_RELOC_REL:
104 rel = (const Elf_Rel *)data;
105 where = (Elf_Addr *) (relocbase + rel->r_offset);
106 addend = *where;
107 rtype = ELF_R_TYPE(rel->r_info);
108 symidx = ELF_R_SYM(rel->r_info);
109 break;
110 case ELF_RELOC_RELA:
111 rela = (const Elf_Rela *)data;
112 where = (Elf_Addr *) (relocbase + rela->r_offset);
113 addend = rela->r_addend;
114 rtype = ELF_R_TYPE(rela->r_info);
115 symidx = ELF_R_SYM(rela->r_info);
116 break;
117 default:
118 panic("unknown reloc type %d\n", type);
119 }
120
121 if (local) {
122 if (rtype == R_386_RELATIVE) { /* A + B */
123 addr = relocbase + addend;
124 if (*where != addr)
125 *where = addr;
126 }
127 return (0);
128 }
129
130 switch (rtype) {
131
132 case R_386_NONE: /* none */
133 break;
134
135 case R_386_32: /* S + A */
136 addr = elf_lookup(lf, symidx, 1);
137 if (addr == 0)
138 return -1;
139 addr += addend;
140 if (*where != addr)
141 *where = addr;
142 break;
143
144 case R_386_PC32: /* S + A - P */
145 addr = elf_lookup(lf, symidx, 1);
146 if (addr == 0)
147 return -1;
148 addr += addend - (Elf_Addr)where;
149 if (*where != addr)
150 *where = addr;
151 break;
152
153 case R_386_COPY: /* none */
154 /*
155 * There shouldn't be copy relocations in kernel
156 * objects.
157 */
158 printf("kldload: unexpected R_COPY relocation\n");
159 return -1;
160 break;
161
162 case R_386_GLOB_DAT: /* S */
163 addr = elf_lookup(lf, symidx, 1);
164 if (addr == 0)
165 return -1;
166 if (*where != addr)
167 *where = addr;
168 break;
169
170 case R_386_RELATIVE:
171 break;
172
173 default:
174 printf("kldload: unexpected relocation type %d\n",
175 rtype);
176 return -1;
177 }
178 return(0);
179}
180
181int
182elf_reloc(linker_file_t lf, const void *data, int type)
183{
184
185 return (elf_reloc_internal(lf, data, type, 0));
186}
187
188int
189elf_reloc_local(linker_file_t lf, const void *data, int type)
190{
191
192 return (elf_reloc_internal(lf, data, type, 1));
193}
194
195int
196elf_cpu_load_file(linker_file_t lf __unused)
197{
198
199 return (0);
200}
201
202int
203elf_cpu_unload_file(linker_file_t lf __unused)
204{
205
206 return (0);
207}