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 .sv_size = SYS_MAXSYSCALL,
53 .sv_table = sysent,
54 .sv_mask = 0,
55 .sv_sigsize = 0,
56 .sv_sigtbl = NULL,
57 .sv_errsize = 0,
58 .sv_errtbl = NULL,
59 .sv_transtrap = NULL,
60 .sv_fixup = __elfN(freebsd_fixup),
61 .sv_sendsig = sendsig,
62 .sv_sigcode = sigcode,
63 .sv_szsigcode = &szsigcode,
64 .sv_prepsyscall = NULL,
65 .sv_name = "FreeBSD ELF32",
66 .sv_coredump = __elfN(coredump),
67 .sv_imgact_try = NULL,
68 .sv_minsigstksz = MINSIGSTKSZ,
69 .sv_pagesize = PAGE_SIZE,
70 .sv_minuser = VM_MIN_ADDRESS,
71 .sv_maxuser = VM_MAXUSER_ADDRESS,
72 .sv_usrstack = USRSTACK,
73 .sv_psstrings = PS_STRINGS,
74 .sv_stackprot = VM_PROT_ALL,
75 .sv_copyout_strings = exec_copyout_strings,
76 .sv_setregs = exec_setregs,
77 .sv_fixlimit = NULL,
78 .sv_maxssiz = NULL,
79 .sv_flags = SV_ABI_FREEBSD | SV_ILP32,
80 .sv_set_syscall_retval = cpu_set_syscall_retval,
81 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
82 .sv_syscallnames = syscallnames,
83 .sv_schedtail = NULL,
84 };
85
86 static Elf32_Brandinfo freebsd_brand_info = {
87 .brand = ELFOSABI_FREEBSD,
88 .machine = EM_PPC,
89 .compat_3_brand = "FreeBSD",
90 .emul_path = NULL,
91 .interp_path = "/libexec/ld-elf.so.1",
92 .sysvec = &elf32_freebsd_sysvec,
93 .interp_newpath = NULL,
94 .brand_note = &elf32_freebsd_brandnote,
95 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
96 };
97
98 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
99 (sysinit_cfunc_t) elf32_insert_brand_entry,
100 &freebsd_brand_info);
101
102 static Elf32_Brandinfo freebsd_brand_oinfo = {
103 .brand = ELFOSABI_FREEBSD,
104 .machine = EM_PPC,
105 .compat_3_brand = "FreeBSD",
106 .emul_path = NULL,
107 .interp_path = "/usr/libexec/ld-elf.so.1",
108 .sysvec = &elf32_freebsd_sysvec,
109 .interp_newpath = NULL,
110 .brand_note = &elf32_freebsd_brandnote,
111 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
112 };
113
114 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
115 (sysinit_cfunc_t) elf32_insert_brand_entry,
116 &freebsd_brand_oinfo);
117
118
119 void
120 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
121 size_t *off __unused)
122 {
123 }
124
125
126 /* Process one elf relocation with addend. */
127 static int
128 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
129 int type, int local, elf_lookup_fn lookup)
130 {
131 Elf_Addr *where;
132 Elf_Half *hwhere;
133 Elf_Addr addr;
134 Elf_Addr addend;
135 Elf_Word rtype, symidx;
136 const Elf_Rela *rela;
137
138 switch (type) {
139 case ELF_RELOC_REL:
140 panic("PPC only supports RELA relocations");
141 break;
142 case ELF_RELOC_RELA:
143 rela = (const Elf_Rela *)data;
144 where = (Elf_Addr *) (relocbase + rela->r_offset);
145 hwhere = (Elf_Half *) (relocbase + rela->r_offset);
146 addend = rela->r_addend;
147 rtype = ELF_R_TYPE(rela->r_info);
148 symidx = ELF_R_SYM(rela->r_info);
149 break;
150 default:
151 panic("elf_reloc: unknown relocation mode %d\n", type);
152 }
153
154 switch (rtype) {
155
156 case R_PPC_NONE:
157 break;
158
159 case R_PPC_ADDR32: /* word32 S + A */
160 addr = lookup(lf, symidx, 1);
161 if (addr == 0)
162 return -1;
163 addr += addend;
164 *where = addr;
165 break;
166
167 case R_PPC_ADDR16_LO: /* #lo(S) */
168 addr = lookup(lf, symidx, 1);
169 if (addr == 0)
170 return -1;
171 /*
172 * addend values are sometimes relative to sections
173 * (i.e. .rodata) in rela, where in reality they
174 * are relative to relocbase. Detect this condition.
175 */
176 if (addr > relocbase && addr <= (relocbase + addend))
177 addr = relocbase + addend;
178 else
179 addr += addend;
180 *hwhere = addr & 0xffff;
181 break;
182
183 case R_PPC_ADDR16_HA: /* #ha(S) */
184 addr = lookup(lf, symidx, 1);
185 if (addr == 0)
186 return -1;
187 /*
188 * addend values are sometimes relative to sections
189 * (i.e. .rodata) in rela, where in reality they
190 * are relative to relocbase. Detect this condition.
191 */
192 if (addr > relocbase && addr <= (relocbase + addend))
193 addr = relocbase + addend;
194 else
195 addr += addend;
196 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
197 & 0xffff;
198 break;
199
200 case R_PPC_RELATIVE: /* word32 B + A */
201 *where = elf_relocaddr(lf, relocbase + addend);
202 break;
203
204 default:
205 printf("kldload: unexpected relocation type %d\n",
206 (int) rtype);
207 return -1;
208 }
209 return(0);
210 }
211
212 int
213 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
214 elf_lookup_fn lookup)
215 {
216
217 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
218 }
219
220 int
221 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
222 int type, elf_lookup_fn lookup)
223 {
224
225 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
226 }
227
228 int
229 elf_cpu_load_file(linker_file_t lf)
230 {
231 /* Only sync the cache for non-kernel modules */
232 if (lf->id != 1)
233 __syncicache(lf->address, lf->size);
234 return (0);
235 }
236
237 int
238 elf_cpu_unload_file(linker_file_t lf __unused)
239 {
240
241 return (0);
242 }
Cache object: aaec045575867ad6c7d3d1ed760686ce
|