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 * $FreeBSD$
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/cpu.h>
48 #include <machine/elf.h>
49 #include <machine/md_var.h>
50
51 struct sysentvec elf32_freebsd_sysvec = {
52 SYS_MAXSYSCALL,
53 sysent,
54 0,
55 0,
56 NULL,
57 0,
58 NULL,
59 NULL,
60 __elfN(freebsd_fixup),
61 sendsig,
62 sigcode,
63 &szsigcode,
64 NULL,
65 "FreeBSD ELF32",
66 __elfN(coredump),
67 NULL,
68 MINSIGSTKSZ,
69 PAGE_SIZE,
70 VM_MIN_ADDRESS,
71 VM_MAXUSER_ADDRESS,
72 USRSTACK,
73 PS_STRINGS,
74 VM_PROT_ALL,
75 exec_copyout_strings,
76 exec_setregs,
77 NULL
78 };
79
80 static Elf32_Brandinfo freebsd_brand_info = {
81 ELFOSABI_FREEBSD,
82 EM_PPC,
83 "FreeBSD",
84 NULL,
85 "/libexec/ld-elf.so.1",
86 &elf32_freebsd_sysvec,
87 NULL,
88 BI_CAN_EXEC_DYN,
89 };
90
91 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY,
92 (sysinit_cfunc_t) elf32_insert_brand_entry,
93 &freebsd_brand_info);
94
95 static Elf32_Brandinfo freebsd_brand_oinfo = {
96 ELFOSABI_FREEBSD,
97 EM_PPC,
98 "FreeBSD",
99 NULL,
100 "/usr/libexec/ld-elf.so.1",
101 &elf32_freebsd_sysvec,
102 NULL,
103 BI_CAN_EXEC_DYN,
104 };
105
106 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
107 (sysinit_cfunc_t) elf32_insert_brand_entry,
108 &freebsd_brand_oinfo);
109
110
111 void
112 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
113 size_t *off __unused)
114 {
115 }
116
117
118 /* Process one elf relocation with addend. */
119 static int
120 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
121 int type, int local, elf_lookup_fn lookup)
122 {
123 Elf_Addr *where;
124 Elf_Half *hwhere;
125 Elf_Addr addr;
126 Elf_Addr addend;
127 Elf_Word rtype, symidx;
128 const Elf_Rela *rela;
129
130 switch (type) {
131 case ELF_RELOC_REL:
132 panic("PPC only supports RELA relocations");
133 break;
134 case ELF_RELOC_RELA:
135 rela = (const Elf_Rela *)data;
136 where = (Elf_Addr *) (relocbase + rela->r_offset);
137 hwhere = (Elf_Half *) (relocbase + rela->r_offset);
138 addend = rela->r_addend;
139 rtype = ELF_R_TYPE(rela->r_info);
140 symidx = ELF_R_SYM(rela->r_info);
141 break;
142 default:
143 panic("elf_reloc: unknown relocation mode %d\n", type);
144 }
145
146 switch (rtype) {
147
148 case R_PPC_NONE:
149 break;
150
151 case R_PPC_ADDR32: /* word32 S + A */
152 addr = lookup(lf, symidx, 1);
153 if (addr == 0)
154 return -1;
155 addr += addend;
156 *where = addr;
157 break;
158
159 case R_PPC_ADDR16_LO: /* #lo(S) */
160 addr = lookup(lf, symidx, 1);
161 if (addr == 0)
162 return -1;
163 /*
164 * addend values are sometimes relative to sections
165 * (i.e. .rodata) in rela, where in reality they
166 * are relative to relocbase. Detect this condition.
167 */
168 if (addr > relocbase && addr <= (relocbase + addend))
169 addr = relocbase + addend;
170 else
171 addr += addend;
172 *hwhere = addr & 0xffff;
173 break;
174
175 case R_PPC_ADDR16_HA: /* #ha(S) */
176 addr = lookup(lf, symidx, 1);
177 if (addr == 0)
178 return -1;
179 /*
180 * addend values are sometimes relative to sections
181 * (i.e. .rodata) in rela, where in reality they
182 * are relative to relocbase. Detect this condition.
183 */
184 if (addr > relocbase && addr <= (relocbase + addend))
185 addr = relocbase + addend;
186 else
187 addr += addend;
188 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
189 & 0xffff;
190 break;
191
192 case R_PPC_RELATIVE: /* word32 B + A */
193 *where = relocbase + addend;
194 break;
195
196 default:
197 printf("kldload: unexpected relocation type %d\n",
198 (int) rtype);
199 return -1;
200 }
201 return(0);
202 }
203
204 int
205 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
206 elf_lookup_fn lookup)
207 {
208
209 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
210 }
211
212 int
213 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
214 int type, elf_lookup_fn lookup)
215 {
216
217 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
218 }
219
220 int
221 elf_cpu_load_file(linker_file_t lf)
222 {
223 /* Only sync the cache for non-kernel modules */
224 if (lf->id != 1)
225 __syncicache(lf->address, lf->size);
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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