1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1994-1996 Søren Schmidt
5 * Copyright (c) 2018 Turing Robotic Industries Inc.
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 AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #define __ELF_WORD_SIZE 64
30
31 #include <sys/param.h>
32 #include <sys/elf.h>
33 #include <sys/exec.h>
34 #include <sys/imgact.h>
35 #include <sys/imgact_elf.h>
36 #include <sys/kernel.h>
37 #include <sys/ktr.h>
38 #include <sys/lock.h>
39 #include <sys/module.h>
40 #include <sys/mutex.h>
41 #include <sys/proc.h>
42 #include <sys/stddef.h>
43 #include <sys/syscallsubr.h>
44 #include <sys/sysctl.h>
45 #include <sys/sysent.h>
46
47 #include <vm/vm.h>
48 #include <vm/vm_param.h>
49
50 #include <arm64/linux/linux.h>
51 #include <arm64/linux/linux_proto.h>
52 #include <compat/linux/linux_elf.h>
53 #include <compat/linux/linux_emul.h>
54 #include <compat/linux/linux_fork.h>
55 #include <compat/linux/linux_ioctl.h>
56 #include <compat/linux/linux_mib.h>
57 #include <compat/linux/linux_misc.h>
58 #include <compat/linux/linux_signal.h>
59 #include <compat/linux/linux_util.h>
60 #include <compat/linux/linux_vdso.h>
61
62 #include <arm64/linux/linux_sigframe.h>
63
64 #include <machine/md_var.h>
65 #include <machine/pcb.h>
66 #ifdef VFP
67 #include <machine/vfp.h>
68 #endif
69
70 MODULE_VERSION(linux64elf, 1);
71
72 #define LINUX_VDSOPAGE_SIZE PAGE_SIZE * 2
73 #define LINUX_VDSOPAGE (VM_MAXUSER_ADDRESS - \
74 LINUX_VDSOPAGE_SIZE)
75 #define LINUX_SHAREDPAGE (LINUX_VDSOPAGE - PAGE_SIZE)
76 /*
77 * PAGE_SIZE - the size
78 * of the native SHAREDPAGE
79 */
80 #define LINUX_USRSTACK LINUX_SHAREDPAGE
81 #define LINUX_PS_STRINGS (LINUX_USRSTACK - \
82 sizeof(struct ps_strings))
83
84 static int linux_szsigcode;
85 static vm_object_t linux_vdso_obj;
86 static char *linux_vdso_mapping;
87 extern char _binary_linux_vdso_so_o_start;
88 extern char _binary_linux_vdso_so_o_end;
89 static vm_offset_t linux_vdso_base;
90
91 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
92 extern const char *linux_syscallnames[];
93
94 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
95
96 static void linux_vdso_install(const void *param);
97 static void linux_vdso_deinstall(const void *param);
98 static void linux_vdso_reloc(char *mapping, Elf_Addr offset);
99 static void linux_set_syscall_retval(struct thread *td, int error);
100 static int linux_fetch_syscall_args(struct thread *td);
101 static void linux_exec_setregs(struct thread *td, struct image_params *imgp,
102 uintptr_t stack);
103 static void linux_exec_sysvec_init(void *param);
104 static int linux_on_exec_vmspace(struct proc *p,
105 struct image_params *imgp);
106
107 LINUX_VDSO_SYM_CHAR(linux_platform);
108 LINUX_VDSO_SYM_INTPTR(kern_timekeep_base);
109 LINUX_VDSO_SYM_INTPTR(__user_rt_sigreturn);
110
111 static int
linux_fetch_syscall_args(struct thread * td)112 linux_fetch_syscall_args(struct thread *td)
113 {
114 struct proc *p;
115 struct syscall_args *sa;
116 register_t *ap;
117
118 p = td->td_proc;
119 ap = td->td_frame->tf_x;
120 sa = &td->td_sa;
121
122 sa->code = td->td_frame->tf_x[8];
123 sa->original_code = sa->code;
124
125 if (sa->code >= p->p_sysent->sv_size)
126 sa->callp = &nosys_sysent;
127 else
128 sa->callp = &p->p_sysent->sv_table[sa->code];
129
130 if (sa->callp->sy_narg > nitems(sa->args))
131 panic("ARM64TODO: Could we have more than %zu args?",
132 nitems(sa->args));
133 memcpy(sa->args, ap, nitems(sa->args) * sizeof(register_t));
134
135 td->td_retval[0] = 0;
136 return (0);
137 }
138
139 static void
linux_set_syscall_retval(struct thread * td,int error)140 linux_set_syscall_retval(struct thread *td, int error)
141 {
142
143 td->td_retval[1] = td->td_frame->tf_x[1];
144 cpu_set_syscall_retval(td, error);
145
146 if (__predict_false(error != 0)) {
147 if (error != ERESTART && error != EJUSTRETURN)
148 td->td_frame->tf_x[0] = bsd_to_linux_errno(error);
149 }
150 }
151
152 void
linux64_arch_copyout_auxargs(struct image_params * imgp,Elf_Auxinfo ** pos)153 linux64_arch_copyout_auxargs(struct image_params *imgp, Elf_Auxinfo **pos)
154 {
155
156 AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
157 AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP, *imgp->sysent->sv_hwcap);
158 AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP2, *imgp->sysent->sv_hwcap2);
159 AUXARGS_ENTRY((*pos), LINUX_AT_PLATFORM, PTROUT(linux_platform));
160 }
161
162 /*
163 * Reset registers to default values on exec.
164 */
165 static void
linux_exec_setregs(struct thread * td,struct image_params * imgp,uintptr_t stack)166 linux_exec_setregs(struct thread *td, struct image_params *imgp,
167 uintptr_t stack)
168 {
169 struct trapframe *regs = td->td_frame;
170 struct pcb *pcb = td->td_pcb;
171
172 memset(regs, 0, sizeof(*regs));
173 regs->tf_sp = stack;
174 regs->tf_elr = imgp->entry_addr;
175 pcb->pcb_tpidr_el0 = 0;
176 pcb->pcb_tpidrro_el0 = 0;
177 WRITE_SPECIALREG(tpidrro_el0, 0);
178 WRITE_SPECIALREG(tpidr_el0, 0);
179
180 #ifdef VFP
181 vfp_reset_state(td, pcb);
182 #endif
183
184 /*
185 * Clear debug register state. It is not applicable to the new process.
186 */
187 bzero(&pcb->pcb_dbg_regs, sizeof(pcb->pcb_dbg_regs));
188 }
189
190 static bool
linux_parse_sigreturn_ctx(struct thread * td,struct l_sigcontext * sc)191 linux_parse_sigreturn_ctx(struct thread *td, struct l_sigcontext *sc)
192 {
193 struct l_fpsimd_context *fpsimd;
194 struct _l_aarch64_ctx *ctx;
195 int offset;
196
197 offset = 0;
198 while (1) {
199 /* The offset must be 16 byte aligned */
200 if ((offset & 15) != 0)
201 return (false);
202
203 /* Check for buffer overflow of the ctx */
204 if ((offset + sizeof(*ctx)) >
205 sizeof(sc->__reserved))
206 return (false);
207
208 ctx = (struct _l_aarch64_ctx *)&sc->__reserved[offset];
209
210 /* Check for buffer overflow of the data */
211 if ((offset + ctx->size) > sizeof(sc->__reserved))
212 return (false);
213
214 switch(ctx->magic) {
215 case 0:
216 if (ctx->size != 0)
217 return (false);
218 return (true);
219 case L_ESR_MAGIC:
220 /* Ignore */
221 break;
222 #ifdef VFP
223 case L_FPSIMD_MAGIC:
224 fpsimd = (struct l_fpsimd_context *)ctx;
225
226 /*
227 * Discard any vfp state for the current thread, we
228 * are about to override it.
229 */
230 critical_enter();
231 vfp_discard(td);
232 critical_exit();
233
234 td->td_pcb->pcb_fpustate.vfp_fpcr = fpsimd->fpcr;
235 td->td_pcb->pcb_fpustate.vfp_fpsr = fpsimd->fpsr;
236 memcpy(td->td_pcb->pcb_fpustate.vfp_regs,
237 fpsimd->vregs, sizeof(fpsimd->vregs));
238
239 break;
240 #endif
241 default:
242 return (false);
243 }
244
245 offset += ctx->size;
246 }
247
248 }
249
250 int
linux_rt_sigreturn(struct thread * td,struct linux_rt_sigreturn_args * args)251 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
252 {
253 struct l_rt_sigframe *sf;
254 struct l_sigframe *frame;
255 struct trapframe *tf;
256 sigset_t bmask;
257 int error;
258
259 sf = malloc(sizeof(*sf), M_LINUX, M_WAITOK | M_ZERO);
260
261 tf = td->td_frame;
262 frame = (struct l_sigframe *)tf->tf_sp;
263 error = copyin((void *)&frame->sf, sf, sizeof(*sf));
264 if (error != 0) {
265 free(sf, M_LINUX);
266 return (error);
267 }
268
269 memcpy(tf->tf_x, sf->sf_uc.uc_sc.regs, sizeof(tf->tf_x));
270 tf->tf_lr = sf->sf_uc.uc_sc.regs[30];
271 tf->tf_sp = sf->sf_uc.uc_sc.sp;
272 tf->tf_elr = sf->sf_uc.uc_sc.pc;
273
274 if ((sf->sf_uc.uc_sc.pstate & PSR_M_MASK) != PSR_M_EL0t ||
275 (sf->sf_uc.uc_sc.pstate & PSR_AARCH32) != 0 ||
276 (sf->sf_uc.uc_sc.pstate & PSR_DAIF) !=
277 (td->td_frame->tf_spsr & PSR_DAIF))
278 goto einval;
279 tf->tf_spsr = sf->sf_uc.uc_sc.pstate;
280
281 if (!linux_parse_sigreturn_ctx(td, &sf->sf_uc.uc_sc))
282 goto einval;
283
284 /* Restore signal mask. */
285 linux_to_bsd_sigset(&sf->sf_uc.uc_sigmask, &bmask);
286 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
287 free(sf, M_LINUX);
288
289 return (EJUSTRETURN);
290 einval:
291 free(sf, M_LINUX);
292 return (EINVAL);
293 }
294
295 static void
linux_rt_sendsig(sig_t catcher,ksiginfo_t * ksi,sigset_t * mask)296 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
297 {
298 struct thread *td;
299 struct proc *p;
300 struct trapframe *tf;
301 struct l_sigframe *fp, *frame;
302 struct l_fpsimd_context *fpsimd;
303 struct l_esr_context *esr;
304 l_stack_t uc_stack;
305 ucontext_t uc;
306 uint8_t *scr;
307 struct sigacts *psp;
308 int onstack, sig, issiginfo;
309
310 td = curthread;
311 p = td->td_proc;
312 PROC_LOCK_ASSERT(p, MA_OWNED);
313
314 sig = ksi->ksi_signo;
315 psp = p->p_sigacts;
316 mtx_assert(&psp->ps_mtx, MA_OWNED);
317
318 tf = td->td_frame;
319 onstack = sigonstack(tf->tf_sp);
320 issiginfo = SIGISMEMBER(psp->ps_siginfo, sig);
321
322 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
323 catcher, sig);
324
325 /* Allocate and validate space for the signal handler context. */
326 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !onstack &&
327 SIGISMEMBER(psp->ps_sigonstack, sig)) {
328 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
329 td->td_sigstk.ss_size);
330 #if defined(COMPAT_43)
331 td->td_sigstk.ss_flags |= SS_ONSTACK;
332 #endif
333 } else {
334 fp = (struct l_sigframe *)td->td_frame->tf_sp;
335 }
336
337 /* Make room, keeping the stack aligned */
338 fp--;
339 fp = (struct l_sigframe *)STACKALIGN(fp);
340
341 get_mcontext(td, &uc.uc_mcontext, 0);
342 uc.uc_sigmask = *mask;
343
344 uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
345 uc_stack.ss_size = td->td_sigstk.ss_size;
346 uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) != 0 ?
347 (onstack ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
348 mtx_unlock(&psp->ps_mtx);
349 PROC_UNLOCK(td->td_proc);
350
351 /* Fill in the frame to copy out */
352 frame = malloc(sizeof(*frame), M_LINUX, M_WAITOK | M_ZERO);
353
354 memcpy(&frame->sf.sf_uc.uc_sc.regs, tf->tf_x, sizeof(tf->tf_x));
355 frame->sf.sf_uc.uc_sc.regs[30] = tf->tf_lr;
356 frame->sf.sf_uc.uc_sc.sp = tf->tf_sp;
357 frame->sf.sf_uc.uc_sc.pc = tf->tf_elr;
358 frame->sf.sf_uc.uc_sc.pstate = tf->tf_spsr;
359 frame->sf.sf_uc.uc_sc.fault_address = (register_t)ksi->ksi_addr;
360
361 /* Stack frame for unwinding */
362 frame->fp = tf->tf_x[29];
363 frame->lr = tf->tf_elr;
364
365 /* Translate the signal. */
366 sig = bsd_to_linux_signal(sig);
367 siginfo_to_lsiginfo(&ksi->ksi_info, &frame->sf.sf_si, sig);
368 bsd_to_linux_sigset(mask, &frame->sf.sf_uc.uc_sigmask);
369
370 /*
371 * Prepare fpsimd & esr. Does not check sizes, as
372 * __reserved is big enougth.
373 */
374 scr = (uint8_t *)&frame->sf.sf_uc.uc_sc.__reserved;
375 #ifdef VFP
376 fpsimd = (struct l_fpsimd_context *) scr;
377 fpsimd->head.magic = L_FPSIMD_MAGIC;
378 fpsimd->head.size = sizeof(struct l_fpsimd_context);
379 fpsimd->fpsr = uc.uc_mcontext.mc_fpregs.fp_sr;
380 fpsimd->fpcr = uc.uc_mcontext.mc_fpregs.fp_cr;
381
382 memcpy(fpsimd->vregs, &uc.uc_mcontext.mc_fpregs.fp_q,
383 sizeof(uc.uc_mcontext.mc_fpregs.fp_q));
384 scr += roundup(sizeof(struct l_fpsimd_context), 16);
385 #endif
386 if (ksi->ksi_addr != 0) {
387 esr = (struct l_esr_context *) scr;
388 esr->head.magic = L_ESR_MAGIC;
389 esr->head.size = sizeof(struct l_esr_context);
390 esr->esr = tf->tf_esr;
391 }
392
393 memcpy(&frame->sf.sf_uc.uc_stack, &uc_stack, sizeof(uc_stack));
394
395 /* Copy the sigframe out to the user's stack. */
396 if (copyout(frame, fp, sizeof(*fp)) != 0) {
397 /* Process has trashed its stack. Kill it. */
398 free(frame, M_LINUX);
399 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
400 PROC_LOCK(p);
401 sigexit(td, SIGILL);
402 }
403 free(frame, M_LINUX);
404
405 tf->tf_x[0]= sig;
406 if (issiginfo) {
407 tf->tf_x[1] = (register_t)&fp->sf.sf_si;
408 tf->tf_x[2] = (register_t)&fp->sf.sf_uc;
409 } else {
410 tf->tf_x[1] = 0;
411 tf->tf_x[2] = 0;
412 }
413 tf->tf_x[29] = (register_t)&fp->fp;
414 tf->tf_elr = (register_t)catcher;
415 tf->tf_sp = (register_t)fp;
416 tf->tf_lr = (register_t)__user_rt_sigreturn;
417
418 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_elr,
419 tf->tf_sp);
420
421 PROC_LOCK(p);
422 mtx_lock(&psp->ps_mtx);
423 }
424
425 struct sysentvec elf_linux_sysvec = {
426 .sv_size = LINUX_SYS_MAXSYSCALL,
427 .sv_table = linux_sysent,
428 .sv_fixup = __elfN(freebsd_fixup),
429 .sv_sendsig = linux_rt_sendsig,
430 .sv_sigcode = &_binary_linux_vdso_so_o_start,
431 .sv_szsigcode = &linux_szsigcode,
432 .sv_name = "Linux ELF64",
433 .sv_coredump = elf64_coredump,
434 .sv_elf_core_osabi = ELFOSABI_NONE,
435 .sv_elf_core_abi_vendor = LINUX_ABI_VENDOR,
436 .sv_elf_core_prepare_notes = linux64_prepare_notes,
437 .sv_minsigstksz = LINUX_MINSIGSTKSZ,
438 .sv_minuser = VM_MIN_ADDRESS,
439 .sv_maxuser = VM_MAXUSER_ADDRESS,
440 .sv_usrstack = LINUX_USRSTACK,
441 .sv_psstrings = LINUX_PS_STRINGS,
442 .sv_psstringssz = sizeof(struct ps_strings),
443 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
444 .sv_copyout_auxargs = __linuxN(copyout_auxargs),
445 .sv_copyout_strings = __linuxN(copyout_strings),
446 .sv_setregs = linux_exec_setregs,
447 .sv_fixlimit = NULL,
448 .sv_maxssiz = NULL,
449 .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP | SV_SIG_DISCIGN |
450 SV_SIG_WAITNDQ | SV_TIMEKEEP,
451 .sv_set_syscall_retval = linux_set_syscall_retval,
452 .sv_fetch_syscall_args = linux_fetch_syscall_args,
453 .sv_syscallnames = linux_syscallnames,
454 .sv_shared_page_base = LINUX_SHAREDPAGE,
455 .sv_shared_page_len = PAGE_SIZE,
456 .sv_schedtail = linux_schedtail,
457 .sv_thread_detach = linux_thread_detach,
458 .sv_trap = NULL,
459 .sv_hwcap = &linux_elf_hwcap,
460 .sv_hwcap2 = &linux_elf_hwcap2,
461 .sv_onexec = linux_on_exec_vmspace,
462 .sv_onexit = linux_on_exit,
463 .sv_ontdexit = linux_thread_dtor,
464 .sv_setid_allowed = &linux_setid_allowed_query,
465 };
466
467 static int
linux_on_exec_vmspace(struct proc * p,struct image_params * imgp)468 linux_on_exec_vmspace(struct proc *p, struct image_params *imgp)
469 {
470 int error;
471
472 error = linux_map_vdso(p, linux_vdso_obj, linux_vdso_base,
473 LINUX_VDSOPAGE_SIZE, imgp);
474 if (error == 0)
475 error = linux_on_exec(p, imgp);
476 return (error);
477 }
478
479 /*
480 * linux_vdso_install() and linux_exec_sysvec_init() must be called
481 * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY).
482 */
483 static void
linux_exec_sysvec_init(void * param)484 linux_exec_sysvec_init(void *param)
485 {
486 l_uintptr_t *ktimekeep_base;
487 struct sysentvec *sv;
488 ptrdiff_t tkoff;
489
490 sv = param;
491 /* Fill timekeep_base */
492 exec_sysvec_init(sv);
493
494 tkoff = kern_timekeep_base - linux_vdso_base;
495 ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff);
496 *ktimekeep_base = sv->sv_shared_page_base + sv->sv_timekeep_offset;
497 }
498 SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY,
499 linux_exec_sysvec_init, &elf_linux_sysvec);
500
501 static void
linux_vdso_install(const void * param)502 linux_vdso_install(const void *param)
503 {
504 char *vdso_start = &_binary_linux_vdso_so_o_start;
505 char *vdso_end = &_binary_linux_vdso_so_o_end;
506
507 linux_szsigcode = vdso_end - vdso_start;
508 MPASS(linux_szsigcode <= LINUX_VDSOPAGE_SIZE);
509
510 linux_vdso_base = LINUX_VDSOPAGE;
511
512 __elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base);
513
514 linux_vdso_obj = __elfN(linux_shared_page_init)
515 (&linux_vdso_mapping, LINUX_VDSOPAGE_SIZE);
516 bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode);
517
518 linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base);
519 }
520 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST,
521 linux_vdso_install, NULL);
522
523 static void
linux_vdso_deinstall(const void * param)524 linux_vdso_deinstall(const void *param)
525 {
526
527 __elfN(linux_shared_page_fini)(linux_vdso_obj,
528 linux_vdso_mapping, LINUX_VDSOPAGE_SIZE);
529 }
530 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
531 linux_vdso_deinstall, NULL);
532
533 static void
linux_vdso_reloc(char * mapping,Elf_Addr offset)534 linux_vdso_reloc(char *mapping, Elf_Addr offset)
535 {
536 Elf_Size rtype, symidx;
537 const Elf_Rela *rela;
538 const Elf_Shdr *shdr;
539 const Elf_Ehdr *ehdr;
540 Elf_Addr *where;
541 Elf_Addr addr, addend;
542 int i, relacnt;
543
544 MPASS(offset != 0);
545
546 relacnt = 0;
547 ehdr = (const Elf_Ehdr *)mapping;
548 shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff);
549 for (i = 0; i < ehdr->e_shnum; i++)
550 {
551 switch (shdr[i].sh_type) {
552 case SHT_REL:
553 printf("Linux Aarch64 vDSO: unexpected Rel section\n");
554 break;
555 case SHT_RELA:
556 rela = (const Elf_Rela *)(mapping + shdr[i].sh_offset);
557 relacnt = shdr[i].sh_size / sizeof(*rela);
558 }
559 }
560
561 for (i = 0; i < relacnt; i++, rela++) {
562 where = (Elf_Addr *)(mapping + rela->r_offset);
563 addend = rela->r_addend;
564 rtype = ELF_R_TYPE(rela->r_info);
565 symidx = ELF_R_SYM(rela->r_info);
566
567 switch (rtype) {
568 case R_AARCH64_NONE: /* none */
569 break;
570
571 case R_AARCH64_RELATIVE: /* B + A */
572 addr = (Elf_Addr)(mapping + addend);
573 if (*where != addr)
574 *where = addr;
575 break;
576 default:
577 printf("Linux Aarch64 vDSO: unexpected relocation type %ld, "
578 "symbol index %ld\n", rtype, symidx);
579 }
580 }
581 }
582
583 static Elf_Brandnote linux64_brandnote = {
584 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
585 .hdr.n_descsz = 16,
586 .hdr.n_type = 1,
587 .vendor = GNU_ABI_VENDOR,
588 .flags = BN_TRANSLATE_OSREL,
589 .trans_osrel = linux_trans_osrel
590 };
591
592 static Elf64_Brandinfo linux_glibc2brand = {
593 .brand = ELFOSABI_LINUX,
594 .machine = EM_AARCH64,
595 .compat_3_brand = "Linux",
596 .interp_path = "/lib64/ld-linux-x86-64.so.2",
597 .sysvec = &elf_linux_sysvec,
598 .interp_newpath = NULL,
599 .brand_note = &linux64_brandnote,
600 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
601 };
602
603 Elf64_Brandinfo *linux_brandlist[] = {
604 &linux_glibc2brand,
605 NULL
606 };
607
608 static int
linux64_elf_modevent(module_t mod,int type,void * data)609 linux64_elf_modevent(module_t mod, int type, void *data)
610 {
611 Elf64_Brandinfo **brandinfo;
612 struct linux_ioctl_handler**lihp;
613 int error;
614
615 error = 0;
616 switch(type) {
617 case MOD_LOAD:
618 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
619 ++brandinfo)
620 if (elf64_insert_brand_entry(*brandinfo) < 0)
621 error = EINVAL;
622 if (error == 0) {
623 SET_FOREACH(lihp, linux_ioctl_handler_set)
624 linux_ioctl_register_handler(*lihp);
625 stclohz = (stathz ? stathz : hz);
626 if (bootverbose)
627 printf("Linux arm64 ELF exec handler installed\n");
628 }
629 break;
630 case MOD_UNLOAD:
631 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
632 ++brandinfo)
633 if (elf64_brand_inuse(*brandinfo))
634 error = EBUSY;
635 if (error == 0) {
636 for (brandinfo = &linux_brandlist[0];
637 *brandinfo != NULL; ++brandinfo)
638 if (elf64_remove_brand_entry(*brandinfo) < 0)
639 error = EINVAL;
640 }
641 if (error == 0) {
642 SET_FOREACH(lihp, linux_ioctl_handler_set)
643 linux_ioctl_unregister_handler(*lihp);
644 if (bootverbose)
645 printf("Linux arm64 ELF exec handler removed\n");
646 } else
647 printf("Could not deinstall Linux arm64 ELF interpreter entry\n");
648 break;
649 default:
650 return (EOPNOTSUPP);
651 }
652 return (error);
653 }
654
655 static moduledata_t linux64_elf_mod = {
656 "linux64elf",
657 linux64_elf_modevent,
658 0
659 };
660
661 DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
662 MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1);
663 FEATURE(linux64, "AArch64 Linux 64bit support");
664