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 * $FreeBSD: releng/5.1/sys/powerpc/powerpc/elf_machdep.c 109605 2003-01-21 02:42:44Z jake $
26 */
27
28 #include <sys/param.h>
29 #include <sys/kernel.h>
30 #include <sys/systm.h>
31 #include <sys/exec.h>
32 #include <sys/imgact.h>
33 #include <sys/malloc.h>
34 #include <sys/proc.h>
35 #include <sys/namei.h>
36 #include <sys/fcntl.h>
37 #include <sys/sysent.h>
38 #include <sys/imgact_elf.h>
39 #include <sys/syscall.h>
40 #include <sys/signalvar.h>
41 #include <sys/vnode.h>
42 #include <sys/linker.h>
43
44 #include <vm/vm.h>
45 #include <vm/vm_param.h>
46
47 #include <machine/elf.h>
48 #include <machine/md_var.h>
49
50 struct sysentvec elf32_freebsd_sysvec = {
51 SYS_MAXSYSCALL,
52 sysent,
53 0,
54 0,
55 NULL,
56 0,
57 NULL,
58 NULL,
59 __elfN(freebsd_fixup),
60 sendsig,
61 sigcode,
62 &szsigcode,
63 NULL,
64 "FreeBSD ELF32",
65 __elfN(coredump),
66 NULL,
67 MINSIGSTKSZ,
68 PAGE_SIZE,
69 VM_MIN_ADDRESS,
70 VM_MAXUSER_ADDRESS,
71 USRSTACK,
72 PS_STRINGS,
73 VM_PROT_ALL,
74 exec_copyout_strings,
75 exec_setregs
76 };
77
78 static Elf32_Brandinfo freebsd_brand_info = {
79 ELFOSABI_FREEBSD,
80 EM_PPC,
81 "FreeBSD",
82 "",
83 "/usr/libexec/ld-elf.so.1",
84 &elf32_freebsd_sysvec
85 };
86
87 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY,
88 (sysinit_cfunc_t) elf32_insert_brand_entry,
89 &freebsd_brand_info);
90
91 /* Process one elf relocation with addend. */
92 static int
93 elf_reloc_internal(linker_file_t lf, const void *data, int type, int local)
94 {
95 Elf_Addr relocbase = (Elf_Addr) lf->address;
96 Elf_Addr *where;
97 Elf_Addr addr;
98 Elf_Addr addend;
99 Elf_Word rtype, symidx;
100 const Elf_Rel *rel;
101 const Elf_Rela *rela;
102
103 switch (type) {
104 case ELF_RELOC_REL:
105 rel = (const Elf_Rel *)data;
106 where = (Elf_Addr *) (relocbase + rel->r_offset);
107 addend = *where;
108 rtype = ELF_R_TYPE(rel->r_info);
109 symidx = ELF_R_SYM(rel->r_info);
110 break;
111 case ELF_RELOC_RELA:
112 rela = (const Elf_Rela *)data;
113 where = (Elf_Addr *) (relocbase + rela->r_offset);
114 addend = rela->r_addend;
115 rtype = ELF_R_TYPE(rela->r_info);
116 symidx = ELF_R_SYM(rela->r_info);
117 break;
118 default:
119 panic("elf_reloc: unknown relocation mode %d\n", type);
120 }
121
122 switch (rtype) {
123
124 case R_PPC_NONE:
125 break;
126
127 case R_PPC_GLOB_DAT:
128 addr = elf_lookup(lf, symidx, 1);
129 if (addr == 0)
130 return -1;
131 addr += addend;
132 if (*where != addr)
133 *where = addr;
134 break;
135
136 case R_PPC_JMP_SLOT:
137 /* No point in lazy binding for kernel modules. */
138 addr = elf_lookup(lf, symidx, 1);
139 if (addr == 0)
140 return -1;
141 if (*where != addr)
142 *where = addr;
143 break;
144
145 case R_PPC_RELATIVE:
146 addr = relocbase + addend + *where;
147 if (*where != addr)
148 *where = addr;
149 break;
150
151 case R_PPC_COPY:
152 /*
153 * There shouldn't be copy relocations in kernel
154 * objects.
155 */
156 printf("kldload: unexpected R_COPY relocation\n");
157 return -1;
158
159 default:
160 printf("kldload: unexpected relocation type %d\n",
161 (int) rtype);
162 return -1;
163 }
164 return(0);
165 }
166
167 int
168 elf_reloc(linker_file_t lf, const void *data, int type)
169 {
170
171 return (elf_reloc_internal(lf, data, type, 0));
172 }
173
174 int
175 elf_reloc_local(linker_file_t lf, const void *data, int type)
176 {
177
178 return (elf_reloc_internal(lf, data, type, 1));
179 }
180
181 int
182 elf_cpu_load_file(linker_file_t lf __unused)
183 {
184
185 return (0);
186 }
187
188 int
189 elf_cpu_unload_file(linker_file_t lf __unused)
190 {
191
192 return (0);
193 }
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