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/8.2/sys/powerpc/powerpc/elf_machdep.c 214755 2010-11-03 21:21:12Z kib $
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 };
84
85 static Elf32_Brandinfo freebsd_brand_info = {
86 .brand = ELFOSABI_FREEBSD,
87 .machine = EM_PPC,
88 .compat_3_brand = "FreeBSD",
89 .emul_path = NULL,
90 .interp_path = "/libexec/ld-elf.so.1",
91 .sysvec = &elf32_freebsd_sysvec,
92 .interp_newpath = NULL,
93 .brand_note = &elf32_freebsd_brandnote,
94 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
95 };
96
97 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
98 (sysinit_cfunc_t) elf32_insert_brand_entry,
99 &freebsd_brand_info);
100
101 static Elf32_Brandinfo freebsd_brand_oinfo = {
102 .brand = ELFOSABI_FREEBSD,
103 .machine = EM_PPC,
104 .compat_3_brand = "FreeBSD",
105 .emul_path = NULL,
106 .interp_path = "/usr/libexec/ld-elf.so.1",
107 .sysvec = &elf32_freebsd_sysvec,
108 .interp_newpath = NULL,
109 .brand_note = &elf32_freebsd_brandnote,
110 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
111 };
112
113 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
114 (sysinit_cfunc_t) elf32_insert_brand_entry,
115 &freebsd_brand_oinfo);
116
117
118 void
119 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
120 size_t *off __unused)
121 {
122 }
123
124
125 /* Process one elf relocation with addend. */
126 static int
127 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
128 int type, int local, elf_lookup_fn lookup)
129 {
130 Elf_Addr *where;
131 Elf_Half *hwhere;
132 Elf_Addr addr;
133 Elf_Addr addend;
134 Elf_Word rtype, symidx;
135 const Elf_Rela *rela;
136
137 switch (type) {
138 case ELF_RELOC_REL:
139 panic("PPC only supports RELA relocations");
140 break;
141 case ELF_RELOC_RELA:
142 rela = (const Elf_Rela *)data;
143 where = (Elf_Addr *) (relocbase + rela->r_offset);
144 hwhere = (Elf_Half *) (relocbase + rela->r_offset);
145 addend = rela->r_addend;
146 rtype = ELF_R_TYPE(rela->r_info);
147 symidx = ELF_R_SYM(rela->r_info);
148 break;
149 default:
150 panic("elf_reloc: unknown relocation mode %d\n", type);
151 }
152
153 switch (rtype) {
154
155 case R_PPC_NONE:
156 break;
157
158 case R_PPC_ADDR32: /* word32 S + A */
159 addr = lookup(lf, symidx, 1);
160 if (addr == 0)
161 return -1;
162 addr += addend;
163 *where = addr;
164 break;
165
166 case R_PPC_ADDR16_LO: /* #lo(S) */
167 addr = lookup(lf, symidx, 1);
168 if (addr == 0)
169 return -1;
170 /*
171 * addend values are sometimes relative to sections
172 * (i.e. .rodata) in rela, where in reality they
173 * are relative to relocbase. Detect this condition.
174 */
175 if (addr > relocbase && addr <= (relocbase + addend))
176 addr = relocbase + addend;
177 else
178 addr += addend;
179 *hwhere = addr & 0xffff;
180 break;
181
182 case R_PPC_ADDR16_HA: /* #ha(S) */
183 addr = lookup(lf, symidx, 1);
184 if (addr == 0)
185 return -1;
186 /*
187 * addend values are sometimes relative to sections
188 * (i.e. .rodata) in rela, where in reality they
189 * are relative to relocbase. Detect this condition.
190 */
191 if (addr > relocbase && addr <= (relocbase + addend))
192 addr = relocbase + addend;
193 else
194 addr += addend;
195 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
196 & 0xffff;
197 break;
198
199 case R_PPC_RELATIVE: /* word32 B + A */
200 *where = elf_relocaddr(lf, relocbase + addend);
201 break;
202
203 default:
204 printf("kldload: unexpected relocation type %d\n",
205 (int) rtype);
206 return -1;
207 }
208 return(0);
209 }
210
211 int
212 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
213 elf_lookup_fn lookup)
214 {
215
216 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
217 }
218
219 int
220 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
221 int type, elf_lookup_fn lookup)
222 {
223
224 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
225 }
226
227 int
228 elf_cpu_load_file(linker_file_t lf)
229 {
230 /* Only sync the cache for non-kernel modules */
231 if (lf->id != 1)
232 __syncicache(lf->address, lf->size);
233 return (0);
234 }
235
236 int
237 elf_cpu_unload_file(linker_file_t lf __unused)
238 {
239
240 return (0);
241 }
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