1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright 1996-1998 John D. Polstra.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * $FreeBSD: releng/12.0/sys/powerpc/powerpc/elf32_machdep.c 338211 2018-08-22 20:44:30Z markj $
28 */
29
30 #include <sys/param.h>
31 #include <sys/kernel.h>
32 #include <sys/systm.h>
33
34 #define __ELF_WORD_SIZE 32
35
36 #include <sys/exec.h>
37 #include <sys/imgact.h>
38 #include <sys/malloc.h>
39 #include <sys/proc.h>
40 #include <sys/namei.h>
41 #include <sys/fcntl.h>
42 #include <sys/sysent.h>
43 #include <sys/imgact_elf.h>
44 #include <sys/syscall.h>
45 #include <sys/sysctl.h>
46 #include <sys/signalvar.h>
47 #include <sys/vnode.h>
48 #include <sys/linker.h>
49
50 #include <vm/vm.h>
51 #include <vm/vm_param.h>
52
53 #include <machine/altivec.h>
54 #include <machine/cpu.h>
55 #include <machine/fpu.h>
56 #include <machine/elf.h>
57 #include <machine/reg.h>
58 #include <machine/md_var.h>
59
60 #ifdef __powerpc64__
61 #include <compat/freebsd32/freebsd32_proto.h>
62 #include <compat/freebsd32/freebsd32_util.h>
63
64 extern const char *freebsd32_syscallnames[];
65 static void ppc32_fixlimit(struct rlimit *rl, int which);
66
67 static SYSCTL_NODE(_compat, OID_AUTO, ppc32, CTLFLAG_RW, 0, "32-bit mode");
68
69 #define PPC32_MAXDSIZ (1024*1024*1024)
70 static u_long ppc32_maxdsiz = PPC32_MAXDSIZ;
71 SYSCTL_ULONG(_compat_ppc32, OID_AUTO, maxdsiz, CTLFLAG_RWTUN, &ppc32_maxdsiz,
72 0, "");
73 #define PPC32_MAXSSIZ (64*1024*1024)
74 u_long ppc32_maxssiz = PPC32_MAXSSIZ;
75 SYSCTL_ULONG(_compat_ppc32, OID_AUTO, maxssiz, CTLFLAG_RWTUN, &ppc32_maxssiz,
76 0, "");
77 #endif
78
79 struct sysentvec elf32_freebsd_sysvec = {
80 .sv_size = SYS_MAXSYSCALL,
81 #ifdef __powerpc64__
82 .sv_table = freebsd32_sysent,
83 #else
84 .sv_table = sysent,
85 #endif
86 .sv_mask = 0,
87 .sv_errsize = 0,
88 .sv_errtbl = NULL,
89 .sv_transtrap = NULL,
90 .sv_fixup = __elfN(freebsd_fixup),
91 .sv_sendsig = sendsig,
92 .sv_sigcode = sigcode32,
93 .sv_szsigcode = &szsigcode32,
94 .sv_name = "FreeBSD ELF32",
95 .sv_coredump = __elfN(coredump),
96 .sv_imgact_try = NULL,
97 .sv_minsigstksz = MINSIGSTKSZ,
98 .sv_pagesize = PAGE_SIZE,
99 .sv_minuser = VM_MIN_ADDRESS,
100 .sv_stackprot = VM_PROT_ALL,
101 #ifdef __powerpc64__
102 .sv_maxuser = VM_MAXUSER_ADDRESS,
103 .sv_usrstack = FREEBSD32_USRSTACK,
104 .sv_psstrings = FREEBSD32_PS_STRINGS,
105 .sv_copyout_strings = freebsd32_copyout_strings,
106 .sv_setregs = ppc32_setregs,
107 .sv_syscallnames = freebsd32_syscallnames,
108 .sv_fixlimit = ppc32_fixlimit,
109 #else
110 .sv_maxuser = VM_MAXUSER_ADDRESS,
111 .sv_usrstack = USRSTACK,
112 .sv_psstrings = PS_STRINGS,
113 .sv_copyout_strings = exec_copyout_strings,
114 .sv_setregs = exec_setregs,
115 .sv_syscallnames = syscallnames,
116 .sv_fixlimit = NULL,
117 #endif
118 .sv_maxssiz = NULL,
119 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP,
120 .sv_set_syscall_retval = cpu_set_syscall_retval,
121 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
122 .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
123 .sv_shared_page_len = PAGE_SIZE,
124 .sv_schedtail = NULL,
125 .sv_thread_detach = NULL,
126 .sv_trap = NULL,
127 .sv_hwcap = &cpu_features,
128 .sv_hwcap2 = &cpu_features2,
129 };
130 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
131
132 static Elf32_Brandinfo freebsd_brand_info = {
133 .brand = ELFOSABI_FREEBSD,
134 .machine = EM_PPC,
135 .compat_3_brand = "FreeBSD",
136 .emul_path = NULL,
137 .interp_path = "/libexec/ld-elf.so.1",
138 .sysvec = &elf32_freebsd_sysvec,
139 #ifdef __powerpc64__
140 .interp_newpath = "/libexec/ld-elf32.so.1",
141 #else
142 .interp_newpath = NULL,
143 #endif
144 .brand_note = &elf32_freebsd_brandnote,
145 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
146 };
147
148 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
149 (sysinit_cfunc_t) elf32_insert_brand_entry,
150 &freebsd_brand_info);
151
152 static Elf32_Brandinfo freebsd_brand_oinfo = {
153 .brand = ELFOSABI_FREEBSD,
154 .machine = EM_PPC,
155 .compat_3_brand = "FreeBSD",
156 .emul_path = NULL,
157 .interp_path = "/usr/libexec/ld-elf.so.1",
158 .sysvec = &elf32_freebsd_sysvec,
159 .interp_newpath = NULL,
160 .brand_note = &elf32_freebsd_brandnote,
161 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
162 };
163
164 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
165 (sysinit_cfunc_t) elf32_insert_brand_entry,
166 &freebsd_brand_oinfo);
167
168 void elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase);
169
170 void
171 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
172 {
173 size_t len;
174 struct pcb *pcb;
175 uint64_t vshr[32];
176 uint64_t *vsr_dw1;
177 int vsr_idx;
178
179 len = 0;
180 pcb = td->td_pcb;
181
182 if (pcb->pcb_flags & PCB_VEC) {
183 save_vec_nodrop(td);
184 if (dst != NULL) {
185 len += elf32_populate_note(NT_PPC_VMX,
186 &pcb->pcb_vec, (char *)dst + len,
187 sizeof(pcb->pcb_vec), NULL);
188 } else
189 len += elf32_populate_note(NT_PPC_VMX, NULL, NULL,
190 sizeof(pcb->pcb_vec), NULL);
191 }
192
193 if (pcb->pcb_flags & PCB_VSX) {
194 save_fpu_nodrop(td);
195 if (dst != NULL) {
196 /*
197 * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and
198 * VSR32-VSR63 overlap with VR0-VR31, so we only copy
199 * the non-overlapping data, which is doubleword 1 of VSR0-VSR31.
200 */
201 for (vsr_idx = 0; vsr_idx < nitems(vshr); vsr_idx++) {
202 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2];
203 vshr[vsr_idx] = *vsr_dw1;
204 }
205 len += elf32_populate_note(NT_PPC_VSX,
206 vshr, (char *)dst + len,
207 sizeof(vshr), NULL);
208 } else
209 len += elf32_populate_note(NT_PPC_VSX, NULL, NULL,
210 sizeof(vshr), NULL);
211 }
212
213 *off = len;
214 }
215
216 #ifndef __powerpc64__
217 bool
218 elf_is_ifunc_reloc(Elf_Size r_info __unused)
219 {
220
221 return (false);
222 }
223
224 /* Process one elf relocation with addend. */
225 static int
226 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
227 int type, int local, elf_lookup_fn lookup)
228 {
229 Elf_Addr *where;
230 Elf_Half *hwhere;
231 Elf_Addr addr;
232 Elf_Addr addend;
233 Elf_Word rtype, symidx;
234 const Elf_Rela *rela;
235 int error;
236
237 switch (type) {
238 case ELF_RELOC_REL:
239 panic("PPC only supports RELA relocations");
240 break;
241 case ELF_RELOC_RELA:
242 rela = (const Elf_Rela *)data;
243 where = (Elf_Addr *) ((uintptr_t)relocbase + rela->r_offset);
244 hwhere = (Elf_Half *) ((uintptr_t)relocbase + rela->r_offset);
245 addend = rela->r_addend;
246 rtype = ELF_R_TYPE(rela->r_info);
247 symidx = ELF_R_SYM(rela->r_info);
248 break;
249 default:
250 panic("elf_reloc: unknown relocation mode %d\n", type);
251 }
252
253 switch (rtype) {
254
255 case R_PPC_NONE:
256 break;
257
258 case R_PPC_ADDR32: /* word32 S + A */
259 error = lookup(lf, symidx, 1, &addr);
260 if (error != 0)
261 return -1;
262 *where = elf_relocaddr(lf, addr + addend);
263 break;
264
265 case R_PPC_ADDR16_LO: /* #lo(S) */
266 error = lookup(lf, symidx, 1, &addr);
267 if (error != 0)
268 return -1;
269 /*
270 * addend values are sometimes relative to sections
271 * (i.e. .rodata) in rela, where in reality they
272 * are relative to relocbase. Detect this condition.
273 */
274 if (addr > relocbase && addr <= (relocbase + addend))
275 addr = relocbase;
276 addr = elf_relocaddr(lf, addr + addend);
277 *hwhere = addr & 0xffff;
278 break;
279
280 case R_PPC_ADDR16_HA: /* #ha(S) */
281 error = lookup(lf, symidx, 1, &addr);
282 if (error != 0)
283 return -1;
284 /*
285 * addend values are sometimes relative to sections
286 * (i.e. .rodata) in rela, where in reality they
287 * are relative to relocbase. Detect this condition.
288 */
289 if (addr > relocbase && addr <= (relocbase + addend))
290 addr = relocbase;
291 addr = elf_relocaddr(lf, addr + addend);
292 *hwhere = ((addr >> 16) + ((addr & 0x8000) ? 1 : 0))
293 & 0xffff;
294 break;
295
296 case R_PPC_RELATIVE: /* word32 B + A */
297 *where = elf_relocaddr(lf, relocbase + addend);
298 break;
299
300 default:
301 printf("kldload: unexpected relocation type %d\n",
302 (int) rtype);
303 return -1;
304 }
305 return(0);
306 }
307
308 void
309 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase)
310 {
311 Elf_Rela *rela = NULL, *relalim;
312 Elf_Addr relasz = 0;
313 Elf_Addr *where;
314
315 /*
316 * Extract the rela/relasz values from the dynamic section
317 */
318 for (; dynp->d_tag != DT_NULL; dynp++) {
319 switch (dynp->d_tag) {
320 case DT_RELA:
321 rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr);
322 break;
323 case DT_RELASZ:
324 relasz = dynp->d_un.d_val;
325 break;
326 }
327 }
328
329 /*
330 * Relocate these values
331 */
332 relalim = (Elf_Rela *)((caddr_t)rela + relasz);
333 for (; rela < relalim; rela++) {
334 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE)
335 continue;
336 where = (Elf_Addr *)(relocbase + rela->r_offset);
337 *where = (Elf_Addr)(relocbase + rela->r_addend);
338 }
339 }
340
341 int
342 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
343 elf_lookup_fn lookup)
344 {
345
346 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
347 }
348
349 int
350 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
351 int type, elf_lookup_fn lookup)
352 {
353
354 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
355 }
356
357 int
358 elf_cpu_load_file(linker_file_t lf)
359 {
360 /* Only sync the cache for non-kernel modules */
361 if (lf->id != 1)
362 __syncicache(lf->address, lf->size);
363 return (0);
364 }
365
366 int
367 elf_cpu_unload_file(linker_file_t lf __unused)
368 {
369
370 return (0);
371 }
372 #endif
373
374 #ifdef __powerpc64__
375 static void
376 ppc32_fixlimit(struct rlimit *rl, int which)
377 {
378 switch (which) {
379 case RLIMIT_DATA:
380 if (ppc32_maxdsiz != 0) {
381 if (rl->rlim_cur > ppc32_maxdsiz)
382 rl->rlim_cur = ppc32_maxdsiz;
383 if (rl->rlim_max > ppc32_maxdsiz)
384 rl->rlim_max = ppc32_maxdsiz;
385 }
386 break;
387 case RLIMIT_STACK:
388 if (ppc32_maxssiz != 0) {
389 if (rl->rlim_cur > ppc32_maxssiz)
390 rl->rlim_cur = ppc32_maxssiz;
391 if (rl->rlim_max > ppc32_maxssiz)
392 rl->rlim_max = ppc32_maxssiz;
393 }
394 break;
395 }
396 }
397 #endif
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