1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/cdefs.h> 35 #include <sys/elf.h> 36 #include <sys/exec.h> 37 #include <sys/imgact.h> 38 #include <sys/imgact_elf.h> 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/module.h> 42 #include <sys/mutex.h> 43 #include <sys/proc.h> 44 #include <sys/stddef.h> 45 #include <sys/signalvar.h> 46 #include <sys/sysctl.h> 47 #include <sys/sysent.h> 48 49 #include <vm/vm.h> 50 #include <vm/pmap.h> 51 #include <vm/vm_map.h> 52 #include <vm/vm_extern.h> 53 #include <vm/vm_object.h> 54 #include <vm/vm_page.h> 55 #include <vm/vm_param.h> 56 57 #include <arm64/linux/linux.h> 58 #include <arm64/linux/linux_proto.h> 59 #include <compat/linux/linux_dtrace.h> 60 #include <compat/linux/linux_emul.h> 61 #include <compat/linux/linux_ioctl.h> 62 #include <compat/linux/linux_mib.h> 63 #include <compat/linux/linux_misc.h> 64 #include <compat/linux/linux_util.h> 65 #include <compat/linux/linux_vdso.h> 66 67 #include <machine/md_var.h> 68 69 #ifdef VFP 70 #include <machine/vfp.h> 71 #endif 72 73 MODULE_VERSION(linux64elf, 1); 74 75 #define LINUX_VDSOPAGE_SIZE PAGE_SIZE * 2 76 #define LINUX_VDSOPAGE (VM_MAXUSER_ADDRESS - \ 77 LINUX_VDSOPAGE_SIZE) 78 #define LINUX_SHAREDPAGE (LINUX_VDSOPAGE - PAGE_SIZE) 79 /* 80 * PAGE_SIZE - the size 81 * of the native SHAREDPAGE 82 */ 83 #define LINUX_USRSTACK LINUX_SHAREDPAGE 84 #define LINUX_PS_STRINGS (LINUX_USRSTACK - \ 85 sizeof(struct ps_strings)) 86 87 static int linux_szsigcode; 88 static vm_object_t linux_vdso_obj; 89 static char *linux_vdso_mapping; 90 extern char _binary_linux_vdso_so_o_start; 91 extern char _binary_linux_vdso_so_o_end; 92 static vm_offset_t linux_vdso_base; 93 94 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 95 96 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 97 98 static int linux_copyout_strings(struct image_params *imgp, 99 uintptr_t *stack_base); 100 static int linux_elf_fixup(uintptr_t *stack_base, 101 struct image_params *iparams); 102 static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel); 103 static void linux_vdso_install(const void *param); 104 static void linux_vdso_deinstall(const void *param); 105 static void linux_vdso_reloc(char *mapping, Elf_Addr offset); 106 static void linux_set_syscall_retval(struct thread *td, int error); 107 static int linux_fetch_syscall_args(struct thread *td); 108 static void linux_exec_setregs(struct thread *td, struct image_params *imgp, 109 uintptr_t stack); 110 static void linux_exec_sysvec_init(void *param); 111 static int linux_on_exec_vmspace(struct proc *p, 112 struct image_params *imgp); 113 114 /* DTrace init */ 115 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 116 117 /* DTrace probes */ 118 LIN_SDT_PROBE_DEFINE2(sysvec, linux_translate_traps, todo, "int", "int"); 119 LIN_SDT_PROBE_DEFINE0(sysvec, linux_exec_setregs, todo); 120 LIN_SDT_PROBE_DEFINE0(sysvec, linux_copyout_auxargs, todo); 121 LIN_SDT_PROBE_DEFINE0(sysvec, linux_elf_fixup, todo); 122 LIN_SDT_PROBE_DEFINE0(sysvec, linux_rt_sigreturn, todo); 123 LIN_SDT_PROBE_DEFINE0(sysvec, linux_rt_sendsig, todo); 124 LIN_SDT_PROBE_DEFINE0(sysvec, linux_vdso_install, todo); 125 LIN_SDT_PROBE_DEFINE0(sysvec, linux_vdso_deinstall, todo); 126 127 LINUX_VDSO_SYM_CHAR(linux_platform); 128 LINUX_VDSO_SYM_INTPTR(kern_timekeep_base); 129 LINUX_VDSO_SYM_INTPTR(__kernel_rt_sigreturn); 130 131 /* LINUXTODO: do we have traps to translate? */ 132 static int 133 linux_translate_traps(int signal, int trap_code) 134 { 135 136 LIN_SDT_PROBE2(sysvec, linux_translate_traps, todo, signal, trap_code); 137 return (signal); 138 } 139 140 static int 141 linux_fetch_syscall_args(struct thread *td) 142 { 143 struct proc *p; 144 struct syscall_args *sa; 145 register_t *ap; 146 147 p = td->td_proc; 148 ap = td->td_frame->tf_x; 149 sa = &td->td_sa; 150 151 sa->code = td->td_frame->tf_x[8]; 152 sa->original_code = sa->code; 153 /* LINUXTODO: generic syscall? */ 154 if (sa->code >= p->p_sysent->sv_size) 155 sa->callp = &p->p_sysent->sv_table[0]; 156 else 157 sa->callp = &p->p_sysent->sv_table[sa->code]; 158 159 if (sa->callp->sy_narg > MAXARGS) 160 panic("ARM64TODO: Could we have more than %d args?", MAXARGS); 161 memcpy(sa->args, ap, MAXARGS * sizeof(register_t)); 162 163 td->td_retval[0] = 0; 164 return (0); 165 } 166 167 static void 168 linux_set_syscall_retval(struct thread *td, int error) 169 { 170 171 td->td_retval[1] = td->td_frame->tf_x[1]; 172 cpu_set_syscall_retval(td, error); 173 174 if (__predict_false(error != 0)) { 175 if (error != ERESTART && error != EJUSTRETURN) 176 td->td_frame->tf_x[0] = bsd_to_linux_errno(error); 177 } 178 } 179 180 static int 181 linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) 182 { 183 Elf_Auxargs *args; 184 Elf_Auxinfo *argarray, *pos; 185 struct proc *p; 186 int error, issetugid; 187 188 LIN_SDT_PROBE0(sysvec, linux_copyout_auxargs, todo); 189 p = imgp->proc; 190 191 args = (Elf64_Auxargs *)imgp->auxargs; 192 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 193 M_WAITOK | M_ZERO); 194 195 issetugid = p->p_flag & P_SUGID ? 1 : 0; 196 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base); 197 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, *imgp->sysent->sv_hwcap); 198 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 199 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 200 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 201 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 202 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 203 AUXARGS_ENTRY(pos, AT_BASE, args->base); 204 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 205 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 206 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 207 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 208 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 209 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 210 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 211 AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary); 212 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, *imgp->sysent->sv_hwcap2); 213 if (imgp->execpathp != 0) 214 AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp); 215 if (args->execfd != -1) 216 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 217 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 218 AUXARGS_ENTRY(pos, AT_NULL, 0); 219 220 free(imgp->auxargs, M_TEMP); 221 imgp->auxargs = NULL; 222 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 223 224 error = copyout(argarray, (void *)base, 225 sizeof(*argarray) * LINUX_AT_COUNT); 226 free(argarray, M_TEMP); 227 return (error); 228 } 229 230 static int 231 linux_elf_fixup(uintptr_t *stack_base, struct image_params *imgp) 232 { 233 234 LIN_SDT_PROBE0(sysvec, linux_elf_fixup, todo); 235 236 return (0); 237 } 238 239 /* 240 * Copy strings out to the new process address space, constructing new arg 241 * and env vector tables. Return a pointer to the base so that it can be used 242 * as the initial stack pointer. 243 * LINUXTODO: deduplicate against other linuxulator archs 244 */ 245 static int 246 linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) 247 { 248 char **vectp; 249 char *stringp; 250 uintptr_t destp, ustringp; 251 struct ps_strings *arginfo; 252 char canary[LINUX_AT_RANDOM_LEN]; 253 size_t execpath_len; 254 struct proc *p; 255 int argc, envc, error; 256 257 /* Calculate string base and vector table pointers. */ 258 if (imgp->execpath != NULL && imgp->auxargs != NULL) 259 execpath_len = strlen(imgp->execpath) + 1; 260 else 261 execpath_len = 0; 262 263 p = imgp->proc; 264 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 265 destp = (uintptr_t)arginfo; 266 267 if (execpath_len != 0) { 268 destp -= execpath_len; 269 destp = rounddown2(destp, sizeof(void *)); 270 imgp->execpathp = (void *)destp; 271 error = copyout(imgp->execpath, imgp->execpathp, execpath_len); 272 if (error != 0) 273 return (error); 274 } 275 276 /* Prepare the canary for SSP. */ 277 arc4rand(canary, sizeof(canary), 0); 278 destp -= roundup(sizeof(canary), sizeof(void *)); 279 imgp->canary = (void *)destp; 280 error = copyout(canary, imgp->canary, sizeof(canary)); 281 if (error != 0) 282 return (error); 283 284 /* Allocate room for the argument and environment strings. */ 285 destp -= ARG_MAX - imgp->args->stringspace; 286 destp = rounddown2(destp, sizeof(void *)); 287 ustringp = destp; 288 289 if (imgp->auxargs) { 290 /* 291 * Allocate room on the stack for the ELF auxargs 292 * array. It has up to LINUX_AT_COUNT entries. 293 */ 294 destp -= LINUX_AT_COUNT * sizeof(Elf64_Auxinfo); 295 destp = rounddown2(destp, sizeof(void *)); 296 } 297 298 vectp = (char **)destp; 299 300 /* 301 * Allocate room for argc and the argv[] and env vectors including the 302 * terminating NULL pointers. 303 */ 304 vectp -= 1 + imgp->args->argc + 1 + imgp->args->envc + 1; 305 vectp = (char **)STACKALIGN(vectp); 306 307 /* vectp also becomes our initial stack base. */ 308 *stack_base = (uintptr_t)vectp; 309 310 stringp = imgp->args->begin_argv; 311 argc = imgp->args->argc; 312 envc = imgp->args->envc; 313 314 /* Copy out strings - arguments and environment. */ 315 error = copyout(stringp, (void *)ustringp, 316 ARG_MAX - imgp->args->stringspace); 317 if (error != 0) 318 return (error); 319 320 /* Fill in "ps_strings" struct for ps, w, etc. */ 321 if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 || 322 suword(&arginfo->ps_nargvstr, argc) != 0) 323 return (EFAULT); 324 325 if (suword(vectp++, argc) != 0) 326 return (EFAULT); 327 328 /* Fill in argument portion of vector table. */ 329 for (; argc > 0; --argc) { 330 if (suword(vectp++, ustringp) != 0) 331 return (EFAULT); 332 while (*stringp++ != 0) 333 ustringp++; 334 ustringp++; 335 } 336 337 /* A null vector table pointer separates the argp's from the envp's. */ 338 if (suword(vectp++, 0) != 0) 339 return (EFAULT); 340 341 if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 || 342 suword(&arginfo->ps_nenvstr, envc) != 0) 343 return (EFAULT); 344 345 /* Fill in environment portion of vector table. */ 346 for (; envc > 0; --envc) { 347 if (suword(vectp++, ustringp) != 0) 348 return (EFAULT); 349 while (*stringp++ != 0) 350 ustringp++; 351 ustringp++; 352 } 353 354 /* The end of the vector table is a null pointer. */ 355 if (suword(vectp, 0) != 0) 356 return (EFAULT); 357 358 if (imgp->auxargs) { 359 vectp++; 360 error = imgp->sysent->sv_copyout_auxargs(imgp, 361 (uintptr_t)vectp); 362 if (error != 0) 363 return (error); 364 } 365 366 return (0); 367 } 368 369 /* 370 * Reset registers to default values on exec. 371 */ 372 static void 373 linux_exec_setregs(struct thread *td, struct image_params *imgp, 374 uintptr_t stack) 375 { 376 struct trapframe *regs = td->td_frame; 377 struct pcb *pcb = td->td_pcb; 378 379 /* LINUXTODO: validate */ 380 LIN_SDT_PROBE0(sysvec, linux_exec_setregs, todo); 381 382 memset(regs, 0, sizeof(*regs)); 383 /* glibc start.S registers function pointer in x0 with atexit. */ 384 regs->tf_sp = stack; 385 #if 0 /* LINUXTODO: See if this is used. */ 386 regs->tf_lr = imgp->entry_addr; 387 #else 388 regs->tf_lr = 0xffffffffffffffff; 389 #endif 390 regs->tf_elr = imgp->entry_addr; 391 392 pcb->pcb_tpidr_el0 = 0; 393 pcb->pcb_tpidrro_el0 = 0; 394 WRITE_SPECIALREG(tpidrro_el0, 0); 395 WRITE_SPECIALREG(tpidr_el0, 0); 396 397 #ifdef VFP 398 vfp_reset_state(td, pcb); 399 #endif 400 401 /* 402 * Clear debug register state. It is not applicable to the new process. 403 */ 404 bzero(&pcb->pcb_dbg_regs, sizeof(pcb->pcb_dbg_regs)); 405 } 406 407 int 408 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 409 { 410 411 /* LINUXTODO: implement */ 412 LIN_SDT_PROBE0(sysvec, linux_rt_sigreturn, todo); 413 return (EDOOFUS); 414 } 415 416 static void 417 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 418 { 419 420 /* LINUXTODO: implement */ 421 LIN_SDT_PROBE0(sysvec, linux_rt_sendsig, todo); 422 } 423 424 struct sysentvec elf_linux_sysvec = { 425 .sv_size = LINUX_SYS_MAXSYSCALL, 426 .sv_table = linux_sysent, 427 .sv_transtrap = linux_translate_traps, 428 .sv_fixup = linux_elf_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_imgact_try = linux_exec_imgact_try, 438 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 439 .sv_minuser = VM_MIN_ADDRESS, 440 .sv_maxuser = VM_MAXUSER_ADDRESS, 441 .sv_usrstack = LINUX_USRSTACK, 442 .sv_psstrings = LINUX_PS_STRINGS, 443 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, 444 .sv_copyout_auxargs = linux_copyout_auxargs, 445 .sv_copyout_strings = linux_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 = NULL, 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 = &elf_hwcap, 460 .sv_hwcap2 = &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 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 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 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_timekeep_base; 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 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 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 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 char GNU_ABI_VENDOR[] = "GNU"; 584 static int GNU_ABI_LINUX = 0; 585 586 /* LINUXTODO: deduplicate */ 587 static bool 588 linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 589 { 590 const Elf32_Word *desc; 591 uintptr_t p; 592 593 p = (uintptr_t)(note + 1); 594 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 595 596 desc = (const Elf32_Word *)p; 597 if (desc[0] != GNU_ABI_LINUX) 598 return (false); 599 600 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); 601 return (true); 602 } 603 604 static Elf_Brandnote linux64_brandnote = { 605 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 606 .hdr.n_descsz = 16, 607 .hdr.n_type = 1, 608 .vendor = GNU_ABI_VENDOR, 609 .flags = BN_TRANSLATE_OSREL, 610 .trans_osrel = linux_trans_osrel 611 }; 612 613 static Elf64_Brandinfo linux_glibc2brand = { 614 .brand = ELFOSABI_LINUX, 615 .machine = EM_AARCH64, 616 .compat_3_brand = "Linux", 617 .emul_path = linux_emul_path, 618 .interp_path = "/lib64/ld-linux-x86-64.so.2", 619 .sysvec = &elf_linux_sysvec, 620 .interp_newpath = NULL, 621 .brand_note = &linux64_brandnote, 622 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 623 }; 624 625 Elf64_Brandinfo *linux_brandlist[] = { 626 &linux_glibc2brand, 627 NULL 628 }; 629 630 static int 631 linux64_elf_modevent(module_t mod, int type, void *data) 632 { 633 Elf64_Brandinfo **brandinfo; 634 struct linux_ioctl_handler**lihp; 635 int error; 636 637 error = 0; 638 switch(type) { 639 case MOD_LOAD: 640 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 641 ++brandinfo) 642 if (elf64_insert_brand_entry(*brandinfo) < 0) 643 error = EINVAL; 644 if (error == 0) { 645 SET_FOREACH(lihp, linux_ioctl_handler_set) 646 linux_ioctl_register_handler(*lihp); 647 stclohz = (stathz ? stathz : hz); 648 if (bootverbose) 649 printf("Linux arm64 ELF exec handler installed\n"); 650 } 651 break; 652 case MOD_UNLOAD: 653 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 654 ++brandinfo) 655 if (elf64_brand_inuse(*brandinfo)) 656 error = EBUSY; 657 if (error == 0) { 658 for (brandinfo = &linux_brandlist[0]; 659 *brandinfo != NULL; ++brandinfo) 660 if (elf64_remove_brand_entry(*brandinfo) < 0) 661 error = EINVAL; 662 } 663 if (error == 0) { 664 SET_FOREACH(lihp, linux_ioctl_handler_set) 665 linux_ioctl_unregister_handler(*lihp); 666 if (bootverbose) 667 printf("Linux arm64 ELF exec handler removed\n"); 668 } else 669 printf("Could not deinstall Linux arm64 ELF interpreter entry\n"); 670 break; 671 default: 672 return (EOPNOTSUPP); 673 } 674 return (error); 675 } 676 677 static moduledata_t linux64_elf_mod = { 678 "linux64elf", 679 linux64_elf_modevent, 680 0 681 }; 682 683 DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 684 MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1); 685 FEATURE(linux64, "AArch64 Linux 64bit support"); 686