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/11.0/sys/powerpc/powerpc/elf32_machdep.c 298052 2016-04-15 14:25:13Z pfg $
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/altivec.h>
51 #include <machine/cpu.h>
52 #include <machine/elf.h>
53 #include <machine/reg.h>
54 #include <machine/md_var.h>
55
56 #ifdef __powerpc64__
57 #include <compat/freebsd32/freebsd32_proto.h>
58 #include <compat/freebsd32/freebsd32_util.h>
59
60 extern const char *freebsd32_syscallnames[];
61 #endif
62
63 struct sysentvec elf32_freebsd_sysvec = {
64 .sv_size = SYS_MAXSYSCALL,
65 #ifdef __powerpc64__
66 .sv_table = freebsd32_sysent,
67 #else
68 .sv_table = sysent,
69 #endif
70 .sv_mask = 0,
71 .sv_errsize = 0,
72 .sv_errtbl = NULL,
73 .sv_transtrap = NULL,
74 .sv_fixup = __elfN(freebsd_fixup),
75 .sv_sendsig = sendsig,
76 .sv_sigcode = sigcode32,
77 .sv_szsigcode = &szsigcode32,
78 .sv_name = "FreeBSD ELF32",
79 .sv_coredump = __elfN(coredump),
80 .sv_imgact_try = NULL,
81 .sv_minsigstksz = MINSIGSTKSZ,
82 .sv_pagesize = PAGE_SIZE,
83 .sv_minuser = VM_MIN_ADDRESS,
84 .sv_stackprot = VM_PROT_ALL,
85 #ifdef __powerpc64__
86 .sv_maxuser = VM_MAXUSER_ADDRESS,
87 .sv_usrstack = FREEBSD32_USRSTACK,
88 .sv_psstrings = FREEBSD32_PS_STRINGS,
89 .sv_copyout_strings = freebsd32_copyout_strings,
90 .sv_setregs = ppc32_setregs,
91 .sv_syscallnames = freebsd32_syscallnames,
92 #else
93 .sv_maxuser = VM_MAXUSER_ADDRESS,
94 .sv_usrstack = USRSTACK,
95 .sv_psstrings = PS_STRINGS,
96 .sv_copyout_strings = exec_copyout_strings,
97 .sv_setregs = exec_setregs,
98 .sv_syscallnames = syscallnames,
99 #endif
100 .sv_fixlimit = NULL,
101 .sv_maxssiz = NULL,
102 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP,
103 .sv_set_syscall_retval = cpu_set_syscall_retval,
104 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
105 .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
106 .sv_shared_page_len = PAGE_SIZE,
107 .sv_schedtail = NULL,
108 .sv_thread_detach = NULL,
109 .sv_trap = 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 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase);
150
151 void
152 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
153 {
154 size_t len;
155 struct pcb *pcb;
156
157 len = 0;
158 pcb = td->td_pcb;
159 if (pcb->pcb_flags & PCB_VEC) {
160 save_vec_nodrop(td);
161 if (dst != NULL) {
162 len += elf32_populate_note(NT_PPC_VMX,
163 &pcb->pcb_vec, dst,
164 sizeof(pcb->pcb_vec), NULL);
165 } else
166 len += elf32_populate_note(NT_PPC_VMX, NULL, NULL,
167 sizeof(pcb->pcb_vec), NULL);
168 }
169 *off = len;
170 }
171
172 #ifndef __powerpc64__
173 /* Process one elf relocation with addend. */
174 static int
175 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
176 int type, int local, elf_lookup_fn lookup)
177 {
178 Elf_Addr *where;
179 Elf_Half *hwhere;
180 Elf_Addr addr;
181 Elf_Addr addend;
182 Elf_Word rtype, symidx;
183 const Elf_Rela *rela;
184 int error;
185
186 switch (type) {
187 case ELF_RELOC_REL:
188 panic("PPC only supports RELA relocations");
189 break;
190 case ELF_RELOC_RELA:
191 rela = (const Elf_Rela *)data;
192 where = (Elf_Addr *) ((uintptr_t)relocbase + rela->r_offset);
193 hwhere = (Elf_Half *) ((uintptr_t)relocbase + rela->r_offset);
194 addend = rela->r_addend;
195 rtype = ELF_R_TYPE(rela->r_info);
196 symidx = ELF_R_SYM(rela->r_info);
197 break;
198 default:
199 panic("elf_reloc: unknown relocation mode %d\n", type);
200 }
201
202 switch (rtype) {
203
204 case R_PPC_NONE:
205 break;
206
207 case R_PPC_ADDR32: /* word32 S + A */
208 error = lookup(lf, symidx, 1, &addr);
209 if (error != 0)
210 return -1;
211 *where = elf_relocaddr(lf, addr + addend);
212 break;
213
214 case R_PPC_ADDR16_LO: /* #lo(S) */
215 error = lookup(lf, symidx, 1, &addr);
216 if (error != 0)
217 return -1;
218 /*
219 * addend values are sometimes relative to sections
220 * (i.e. .rodata) in rela, where in reality they
221 * are relative to relocbase. Detect this condition.
222 */
223 if (addr > relocbase && addr <= (relocbase + addend))
224 addr = relocbase;
225 addr = elf_relocaddr(lf, addr + addend);
226 *hwhere = addr & 0xffff;
227 break;
228
229 case R_PPC_ADDR16_HA: /* #ha(S) */
230 error = lookup(lf, symidx, 1, &addr);
231 if (error != 0)
232 return -1;
233 /*
234 * addend values are sometimes relative to sections
235 * (i.e. .rodata) in rela, where in reality they
236 * are relative to relocbase. Detect this condition.
237 */
238 if (addr > relocbase && addr <= (relocbase + addend))
239 addr = relocbase;
240 addr = elf_relocaddr(lf, addr + addend);
241 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
242 & 0xffff;
243 break;
244
245 case R_PPC_RELATIVE: /* word32 B + A */
246 *where = elf_relocaddr(lf, relocbase + addend);
247 break;
248
249 default:
250 printf("kldload: unexpected relocation type %d\n",
251 (int) rtype);
252 return -1;
253 }
254 return(0);
255 }
256
257 void
258 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase)
259 {
260 Elf_Rela *rela = NULL, *relalim;
261 Elf_Addr relasz = 0;
262 Elf_Addr *where;
263
264 /*
265 * Extract the rela/relasz values from the dynamic section
266 */
267 for (; dynp->d_tag != DT_NULL; dynp++) {
268 switch (dynp->d_tag) {
269 case DT_RELA:
270 rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr);
271 break;
272 case DT_RELASZ:
273 relasz = dynp->d_un.d_val;
274 break;
275 }
276 }
277
278 /*
279 * Relocate these values
280 */
281 relalim = (Elf_Rela *)((caddr_t)rela + relasz);
282 for (; rela < relalim; rela++) {
283 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE)
284 continue;
285 where = (Elf_Addr *)(relocbase + rela->r_offset);
286 *where = (Elf_Addr)(relocbase + rela->r_addend);
287 }
288 }
289
290 int
291 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
292 elf_lookup_fn lookup)
293 {
294
295 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
296 }
297
298 int
299 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
300 int type, elf_lookup_fn lookup)
301 {
302
303 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
304 }
305
306 int
307 elf_cpu_load_file(linker_file_t lf)
308 {
309 /* Only sync the cache for non-kernel modules */
310 if (lf->id != 1)
311 __syncicache(lf->address, lf->size);
312 return (0);
313 }
314
315 int
316 elf_cpu_unload_file(linker_file_t lf __unused)
317 {
318
319 return (0);
320 }
321 #endif
Cache object: 51ea41729fa00990734545f2a560d8a0
|