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/9.1/sys/powerpc/powerpc/elf32_machdep.c 219405 2011-03-08 19:01:45Z dchagin $
26 */
27
28 #include <sys/param.h>
29 #include <sys/kernel.h>
30 #include <sys/systm.h>
31
32 #define __ELF_WORD_SIZE 32
33
34 #include <sys/exec.h>
35 #include <sys/imgact.h>
36 #include <sys/malloc.h>
37 #include <sys/proc.h>
38 #include <sys/namei.h>
39 #include <sys/fcntl.h>
40 #include <sys/sysent.h>
41 #include <sys/imgact_elf.h>
42 #include <sys/syscall.h>
43 #include <sys/signalvar.h>
44 #include <sys/vnode.h>
45 #include <sys/linker.h>
46
47 #include <vm/vm.h>
48 #include <vm/vm_param.h>
49
50 #include <machine/cpu.h>
51 #include <machine/elf.h>
52 #include <machine/reg.h>
53 #include <machine/md_var.h>
54
55 #ifdef __powerpc64__
56 #include <compat/freebsd32/freebsd32_proto.h>
57 #include <compat/freebsd32/freebsd32_util.h>
58
59 extern const char *freebsd32_syscallnames[];
60 #endif
61
62 struct sysentvec elf32_freebsd_sysvec = {
63 .sv_size = SYS_MAXSYSCALL,
64 #ifdef __powerpc64__
65 .sv_table = freebsd32_sysent,
66 #else
67 .sv_table = sysent,
68 #endif
69 .sv_mask = 0,
70 .sv_sigsize = 0,
71 .sv_sigtbl = NULL,
72 .sv_errsize = 0,
73 .sv_errtbl = NULL,
74 .sv_transtrap = NULL,
75 .sv_fixup = __elfN(freebsd_fixup),
76 .sv_sendsig = sendsig,
77 .sv_sigcode = sigcode32,
78 .sv_szsigcode = &szsigcode32,
79 .sv_prepsyscall = NULL,
80 .sv_name = "FreeBSD ELF32",
81 .sv_coredump = __elfN(coredump),
82 .sv_imgact_try = NULL,
83 .sv_minsigstksz = MINSIGSTKSZ,
84 .sv_pagesize = PAGE_SIZE,
85 .sv_minuser = VM_MIN_ADDRESS,
86 .sv_stackprot = VM_PROT_ALL,
87 #ifdef __powerpc64__
88 .sv_maxuser = VM_MAXUSER_ADDRESS,
89 .sv_usrstack = FREEBSD32_USRSTACK,
90 .sv_psstrings = FREEBSD32_PS_STRINGS,
91 .sv_copyout_strings = freebsd32_copyout_strings,
92 .sv_setregs = ppc32_setregs,
93 .sv_syscallnames = freebsd32_syscallnames,
94 #else
95 .sv_maxuser = VM_MAXUSER_ADDRESS,
96 .sv_usrstack = USRSTACK,
97 .sv_psstrings = PS_STRINGS,
98 .sv_copyout_strings = exec_copyout_strings,
99 .sv_setregs = exec_setregs,
100 .sv_syscallnames = syscallnames,
101 #endif
102 .sv_fixlimit = NULL,
103 .sv_maxssiz = NULL,
104 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP,
105 .sv_set_syscall_retval = cpu_set_syscall_retval,
106 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
107 .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
108 .sv_shared_page_len = PAGE_SIZE,
109 .sv_schedtail = NULL,
110 };
111 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
112
113 static Elf32_Brandinfo freebsd_brand_info = {
114 .brand = ELFOSABI_FREEBSD,
115 .machine = EM_PPC,
116 .compat_3_brand = "FreeBSD",
117 .emul_path = NULL,
118 .interp_path = "/libexec/ld-elf.so.1",
119 .sysvec = &elf32_freebsd_sysvec,
120 #ifdef __powerpc64__
121 .interp_newpath = "/libexec/ld-elf32.so.1",
122 #else
123 .interp_newpath = NULL,
124 #endif
125 .brand_note = &elf32_freebsd_brandnote,
126 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
127 };
128
129 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
130 (sysinit_cfunc_t) elf32_insert_brand_entry,
131 &freebsd_brand_info);
132
133 static Elf32_Brandinfo freebsd_brand_oinfo = {
134 .brand = ELFOSABI_FREEBSD,
135 .machine = EM_PPC,
136 .compat_3_brand = "FreeBSD",
137 .emul_path = NULL,
138 .interp_path = "/usr/libexec/ld-elf.so.1",
139 .sysvec = &elf32_freebsd_sysvec,
140 .interp_newpath = NULL,
141 .brand_note = &elf32_freebsd_brandnote,
142 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
143 };
144
145 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
146 (sysinit_cfunc_t) elf32_insert_brand_entry,
147 &freebsd_brand_oinfo);
148
149 void
150 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
151 size_t *off __unused)
152 {
153 }
154
155 #ifndef __powerpc64__
156 /* Process one elf relocation with addend. */
157 static int
158 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
159 int type, int local, elf_lookup_fn lookup)
160 {
161 Elf_Addr *where;
162 Elf_Half *hwhere;
163 Elf_Addr addr;
164 Elf_Addr addend;
165 Elf_Word rtype, symidx;
166 const Elf_Rela *rela;
167
168 switch (type) {
169 case ELF_RELOC_REL:
170 panic("PPC only supports RELA relocations");
171 break;
172 case ELF_RELOC_RELA:
173 rela = (const Elf_Rela *)data;
174 where = (Elf_Addr *) ((uintptr_t)relocbase + rela->r_offset);
175 hwhere = (Elf_Half *) ((uintptr_t)relocbase + rela->r_offset);
176 addend = rela->r_addend;
177 rtype = ELF_R_TYPE(rela->r_info);
178 symidx = ELF_R_SYM(rela->r_info);
179 break;
180 default:
181 panic("elf_reloc: unknown relocation mode %d\n", type);
182 }
183
184 switch (rtype) {
185
186 case R_PPC_NONE:
187 break;
188
189 case R_PPC_ADDR32: /* word32 S + A */
190 addr = lookup(lf, symidx, 1);
191 if (addr == 0)
192 return -1;
193 addr += addend;
194 *where = addr;
195 break;
196
197 case R_PPC_ADDR16_LO: /* #lo(S) */
198 addr = lookup(lf, symidx, 1);
199 if (addr == 0)
200 return -1;
201 /*
202 * addend values are sometimes relative to sections
203 * (i.e. .rodata) in rela, where in reality they
204 * are relative to relocbase. Detect this condition.
205 */
206 if (addr > relocbase && addr <= (relocbase + addend))
207 addr = relocbase + addend;
208 else
209 addr += addend;
210 *hwhere = addr & 0xffff;
211 break;
212
213 case R_PPC_ADDR16_HA: /* #ha(S) */
214 addr = lookup(lf, symidx, 1);
215 if (addr == 0)
216 return -1;
217 /*
218 * addend values are sometimes relative to sections
219 * (i.e. .rodata) in rela, where in reality they
220 * are relative to relocbase. Detect this condition.
221 */
222 if (addr > relocbase && addr <= (relocbase + addend))
223 addr = relocbase + addend;
224 else
225 addr += addend;
226 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
227 & 0xffff;
228 break;
229
230 case R_PPC_RELATIVE: /* word32 B + A */
231 *where = elf_relocaddr(lf, relocbase + addend);
232 break;
233
234 default:
235 printf("kldload: unexpected relocation type %d\n",
236 (int) rtype);
237 return -1;
238 }
239 return(0);
240 }
241
242 int
243 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
244 elf_lookup_fn lookup)
245 {
246
247 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
248 }
249
250 int
251 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
252 int type, elf_lookup_fn lookup)
253 {
254
255 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
256 }
257
258 int
259 elf_cpu_load_file(linker_file_t lf)
260 {
261 /* Only sync the cache for non-kernel modules */
262 if (lf->id != 1)
263 __syncicache(lf->address, lf->size);
264 return (0);
265 }
266
267 int
268 elf_cpu_unload_file(linker_file_t lf __unused)
269 {
270
271 return (0);
272 }
273 #endif
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