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 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 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 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_HWCAP3, *imgp->sysent->sv_hwcap3); 160 AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP4, *imgp->sysent->sv_hwcap4); 161 AUXARGS_ENTRY((*pos), LINUX_AT_PLATFORM, PTROUT(linux_platform)); 162 } 163 164 /* 165 * Reset registers to default values on exec. 166 */ 167 static void 168 linux_exec_setregs(struct thread *td, struct image_params *imgp, 169 uintptr_t stack) 170 { 171 struct trapframe *regs = td->td_frame; 172 struct pcb *pcb = td->td_pcb; 173 174 memset(regs, 0, sizeof(*regs)); 175 regs->tf_sp = stack; 176 regs->tf_elr = imgp->entry_addr; 177 pcb->pcb_tpidr_el0 = 0; 178 pcb->pcb_tpidrro_el0 = 0; 179 WRITE_SPECIALREG(tpidrro_el0, 0); 180 WRITE_SPECIALREG(tpidr_el0, 0); 181 182 #ifdef VFP 183 vfp_reset_state(td, pcb); 184 #endif 185 186 /* 187 * Clear debug register state. It is not applicable to the new process. 188 */ 189 bzero(&pcb->pcb_dbg_regs, sizeof(pcb->pcb_dbg_regs)); 190 } 191 192 static bool 193 linux_parse_sigreturn_ctx(struct thread *td, struct l_sigcontext *sc) 194 { 195 struct l_fpsimd_context *fpsimd; 196 struct _l_aarch64_ctx *ctx; 197 int offset; 198 199 offset = 0; 200 while (1) { 201 /* The offset must be 16 byte aligned */ 202 if ((offset & 15) != 0) 203 return (false); 204 205 /* Check for buffer overflow of the ctx */ 206 if ((offset + sizeof(*ctx)) > 207 sizeof(sc->__reserved)) 208 return (false); 209 210 ctx = (struct _l_aarch64_ctx *)&sc->__reserved[offset]; 211 212 /* Check for buffer overflow of the data */ 213 if ((offset + ctx->size) > sizeof(sc->__reserved)) 214 return (false); 215 216 switch(ctx->magic) { 217 case 0: 218 if (ctx->size != 0) 219 return (false); 220 return (true); 221 case L_ESR_MAGIC: 222 /* Ignore */ 223 break; 224 #ifdef VFP 225 case L_FPSIMD_MAGIC: 226 fpsimd = (struct l_fpsimd_context *)ctx; 227 228 /* 229 * Discard any vfp state for the current thread, we 230 * are about to override it. 231 */ 232 critical_enter(); 233 vfp_discard(td); 234 critical_exit(); 235 236 td->td_pcb->pcb_fpustate.vfp_fpcr = fpsimd->fpcr; 237 td->td_pcb->pcb_fpustate.vfp_fpsr = fpsimd->fpsr; 238 memcpy(td->td_pcb->pcb_fpustate.vfp_regs, 239 fpsimd->vregs, sizeof(fpsimd->vregs)); 240 241 break; 242 #endif 243 default: 244 return (false); 245 } 246 247 offset += ctx->size; 248 } 249 250 } 251 252 int 253 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 254 { 255 struct l_rt_sigframe *sf; 256 struct l_sigframe *frame; 257 struct trapframe *tf; 258 sigset_t bmask; 259 int error; 260 261 sf = malloc(sizeof(*sf), M_LINUX, M_WAITOK | M_ZERO); 262 263 tf = td->td_frame; 264 frame = (struct l_sigframe *)tf->tf_sp; 265 error = copyin((void *)&frame->sf, sf, sizeof(*sf)); 266 if (error != 0) { 267 free(sf, M_LINUX); 268 return (error); 269 } 270 271 memcpy(tf->tf_x, sf->sf_uc.uc_sc.regs, sizeof(tf->tf_x)); 272 tf->tf_lr = sf->sf_uc.uc_sc.regs[30]; 273 tf->tf_sp = sf->sf_uc.uc_sc.sp; 274 tf->tf_elr = sf->sf_uc.uc_sc.pc; 275 276 if ((sf->sf_uc.uc_sc.pstate & PSR_M_MASK) != PSR_M_EL0t || 277 (sf->sf_uc.uc_sc.pstate & PSR_AARCH32) != 0 || 278 (sf->sf_uc.uc_sc.pstate & PSR_DAIF) != 279 (td->td_frame->tf_spsr & PSR_DAIF)) 280 goto einval; 281 tf->tf_spsr = sf->sf_uc.uc_sc.pstate; 282 283 if (!linux_parse_sigreturn_ctx(td, &sf->sf_uc.uc_sc)) 284 goto einval; 285 286 /* Restore signal mask. */ 287 linux_to_bsd_sigset(&sf->sf_uc.uc_sigmask, &bmask); 288 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 289 free(sf, M_LINUX); 290 291 return (EJUSTRETURN); 292 einval: 293 free(sf, M_LINUX); 294 return (EINVAL); 295 } 296 297 static void 298 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 299 { 300 struct thread *td; 301 struct proc *p; 302 struct trapframe *tf; 303 struct l_sigframe *fp, *frame; 304 struct l_fpsimd_context *fpsimd; 305 struct l_esr_context *esr; 306 l_stack_t uc_stack; 307 ucontext_t uc; 308 uint8_t *scr; 309 struct sigacts *psp; 310 int onstack, sig, issiginfo; 311 312 td = curthread; 313 p = td->td_proc; 314 PROC_LOCK_ASSERT(p, MA_OWNED); 315 316 sig = ksi->ksi_signo; 317 psp = p->p_sigacts; 318 mtx_assert(&psp->ps_mtx, MA_OWNED); 319 320 tf = td->td_frame; 321 onstack = sigonstack(tf->tf_sp); 322 issiginfo = SIGISMEMBER(psp->ps_siginfo, sig); 323 324 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm, 325 catcher, sig); 326 327 /* Allocate and validate space for the signal handler context. */ 328 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !onstack && 329 SIGISMEMBER(psp->ps_sigonstack, sig)) { 330 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 331 td->td_sigstk.ss_size); 332 #if defined(COMPAT_43) 333 td->td_sigstk.ss_flags |= SS_ONSTACK; 334 #endif 335 } else { 336 fp = (struct l_sigframe *)td->td_frame->tf_sp; 337 } 338 339 /* Make room, keeping the stack aligned */ 340 fp--; 341 fp = (struct l_sigframe *)STACKALIGN(fp); 342 343 get_mcontext(td, &uc.uc_mcontext, 0); 344 uc.uc_sigmask = *mask; 345 346 uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 347 uc_stack.ss_size = td->td_sigstk.ss_size; 348 uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) != 0 ? 349 (onstack ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 350 mtx_unlock(&psp->ps_mtx); 351 PROC_UNLOCK(td->td_proc); 352 353 /* Fill in the frame to copy out */ 354 frame = malloc(sizeof(*frame), M_LINUX, M_WAITOK | M_ZERO); 355 356 memcpy(&frame->sf.sf_uc.uc_sc.regs, tf->tf_x, sizeof(tf->tf_x)); 357 frame->sf.sf_uc.uc_sc.regs[30] = tf->tf_lr; 358 frame->sf.sf_uc.uc_sc.sp = tf->tf_sp; 359 frame->sf.sf_uc.uc_sc.pc = tf->tf_elr; 360 frame->sf.sf_uc.uc_sc.pstate = tf->tf_spsr; 361 frame->sf.sf_uc.uc_sc.fault_address = (register_t)ksi->ksi_addr; 362 363 /* Stack frame for unwinding */ 364 frame->fp = tf->tf_x[29]; 365 frame->lr = tf->tf_elr; 366 367 /* Translate the signal. */ 368 sig = bsd_to_linux_signal(sig); 369 siginfo_to_lsiginfo(&ksi->ksi_info, &frame->sf.sf_si, sig); 370 bsd_to_linux_sigset(mask, &frame->sf.sf_uc.uc_sigmask); 371 372 /* 373 * Prepare fpsimd & esr. Does not check sizes, as 374 * __reserved is big enougth. 375 */ 376 scr = (uint8_t *)&frame->sf.sf_uc.uc_sc.__reserved; 377 #ifdef VFP 378 fpsimd = (struct l_fpsimd_context *) scr; 379 fpsimd->head.magic = L_FPSIMD_MAGIC; 380 fpsimd->head.size = sizeof(struct l_fpsimd_context); 381 fpsimd->fpsr = uc.uc_mcontext.mc_fpregs.fp_sr; 382 fpsimd->fpcr = uc.uc_mcontext.mc_fpregs.fp_cr; 383 384 memcpy(fpsimd->vregs, &uc.uc_mcontext.mc_fpregs.fp_q, 385 sizeof(uc.uc_mcontext.mc_fpregs.fp_q)); 386 scr += roundup(sizeof(struct l_fpsimd_context), 16); 387 #endif 388 if (ksi->ksi_addr != 0) { 389 esr = (struct l_esr_context *) scr; 390 esr->head.magic = L_ESR_MAGIC; 391 esr->head.size = sizeof(struct l_esr_context); 392 esr->esr = tf->tf_esr; 393 } 394 395 memcpy(&frame->sf.sf_uc.uc_stack, &uc_stack, sizeof(uc_stack)); 396 397 /* Copy the sigframe out to the user's stack. */ 398 if (copyout(frame, fp, sizeof(*fp)) != 0) { 399 /* Process has trashed its stack. Kill it. */ 400 free(frame, M_LINUX); 401 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp); 402 PROC_LOCK(p); 403 sigexit(td, SIGILL); 404 } 405 free(frame, M_LINUX); 406 407 tf->tf_x[0]= sig; 408 if (issiginfo) { 409 tf->tf_x[1] = (register_t)&fp->sf.sf_si; 410 tf->tf_x[2] = (register_t)&fp->sf.sf_uc; 411 } else { 412 tf->tf_x[1] = 0; 413 tf->tf_x[2] = 0; 414 } 415 tf->tf_x[29] = (register_t)&fp->fp; 416 tf->tf_elr = (register_t)catcher; 417 tf->tf_sp = (register_t)fp; 418 tf->tf_lr = (register_t)__user_rt_sigreturn; 419 420 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_elr, 421 tf->tf_sp); 422 423 PROC_LOCK(p); 424 mtx_lock(&psp->ps_mtx); 425 } 426 427 struct sysentvec elf_linux_sysvec = { 428 .sv_size = LINUX_SYS_MAXSYSCALL, 429 .sv_table = linux_sysent, 430 .sv_fixup = __elfN(freebsd_fixup), 431 .sv_sendsig = linux_rt_sendsig, 432 .sv_sigcode = &_binary_linux_vdso_so_o_start, 433 .sv_szsigcode = &linux_szsigcode, 434 .sv_name = "Linux ELF64", 435 .sv_coredump = elf64_coredump, 436 .sv_elf_core_osabi = ELFOSABI_NONE, 437 .sv_elf_core_abi_vendor = LINUX_ABI_VENDOR, 438 .sv_elf_core_prepare_notes = linux64_prepare_notes, 439 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 440 .sv_minuser = VM_MIN_ADDRESS, 441 .sv_maxuser = VM_MAXUSER_ADDRESS, 442 .sv_usrstack = LINUX_USRSTACK, 443 .sv_psstrings = LINUX_PS_STRINGS, 444 .sv_psstringssz = sizeof(struct ps_strings), 445 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, 446 .sv_copyout_auxargs = __linuxN(copyout_auxargs), 447 .sv_copyout_strings = __linuxN(copyout_strings), 448 .sv_setregs = linux_exec_setregs, 449 .sv_fixlimit = NULL, 450 .sv_maxssiz = NULL, 451 .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP | SV_SIG_DISCIGN | 452 SV_SIG_WAITNDQ | SV_TIMEKEEP, 453 .sv_set_syscall_retval = linux_set_syscall_retval, 454 .sv_fetch_syscall_args = linux_fetch_syscall_args, 455 .sv_syscallnames = linux_syscallnames, 456 .sv_shared_page_base = LINUX_SHAREDPAGE, 457 .sv_shared_page_len = PAGE_SIZE, 458 .sv_schedtail = linux_schedtail, 459 .sv_thread_detach = linux_thread_detach, 460 .sv_trap = NULL, 461 .sv_hwcap = &linux_elf_hwcap, 462 .sv_hwcap2 = &linux_elf_hwcap2, 463 .sv_hwcap3 = &linux_elf_hwcap3, 464 .sv_hwcap4 = &linux_elf_hwcap4, 465 .sv_onexec = linux_on_exec_vmspace, 466 .sv_onexit = linux_on_exit, 467 .sv_ontdexit = linux_thread_dtor, 468 .sv_setid_allowed = &linux_setid_allowed_query, 469 }; 470 471 static int 472 linux_on_exec_vmspace(struct proc *p, struct image_params *imgp) 473 { 474 int error; 475 476 error = linux_map_vdso(p, linux_vdso_obj, linux_vdso_base, 477 LINUX_VDSOPAGE_SIZE, imgp); 478 if (error == 0) 479 error = linux_on_exec(p, imgp); 480 return (error); 481 } 482 483 /* 484 * linux_vdso_install() and linux_exec_sysvec_init() must be called 485 * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY). 486 */ 487 static void 488 linux_exec_sysvec_init(void *param) 489 { 490 l_uintptr_t *ktimekeep_base; 491 struct sysentvec *sv; 492 ptrdiff_t tkoff; 493 494 sv = param; 495 /* Fill timekeep_base */ 496 exec_sysvec_init(sv); 497 498 tkoff = kern_timekeep_base - linux_vdso_base; 499 ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 500 *ktimekeep_base = sv->sv_shared_page_base + sv->sv_timekeep_offset; 501 } 502 SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY, 503 linux_exec_sysvec_init, &elf_linux_sysvec); 504 505 static void 506 linux_vdso_install(const void *param) 507 { 508 char *vdso_start = &_binary_linux_vdso_so_o_start; 509 char *vdso_end = &_binary_linux_vdso_so_o_end; 510 511 linux_szsigcode = vdso_end - vdso_start; 512 MPASS(linux_szsigcode <= LINUX_VDSOPAGE_SIZE); 513 514 linux_vdso_base = LINUX_VDSOPAGE; 515 516 __elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base); 517 518 linux_vdso_obj = __elfN(linux_shared_page_init) 519 (&linux_vdso_mapping, LINUX_VDSOPAGE_SIZE); 520 bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode); 521 522 linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base); 523 } 524 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST, 525 linux_vdso_install, NULL); 526 527 static void 528 linux_vdso_deinstall(const void *param) 529 { 530 531 __elfN(linux_shared_page_fini)(linux_vdso_obj, 532 linux_vdso_mapping, LINUX_VDSOPAGE_SIZE); 533 } 534 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 535 linux_vdso_deinstall, NULL); 536 537 static void 538 linux_vdso_reloc(char *mapping, Elf_Addr offset) 539 { 540 Elf_Size rtype, symidx; 541 const Elf_Rela *rela; 542 const Elf_Shdr *shdr; 543 const Elf_Ehdr *ehdr; 544 Elf_Addr *where; 545 Elf_Addr addr, addend; 546 int i, relacnt; 547 548 MPASS(offset != 0); 549 550 relacnt = 0; 551 ehdr = (const Elf_Ehdr *)mapping; 552 shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff); 553 for (i = 0; i < ehdr->e_shnum; i++) 554 { 555 switch (shdr[i].sh_type) { 556 case SHT_REL: 557 printf("Linux Aarch64 vDSO: unexpected Rel section\n"); 558 break; 559 case SHT_RELA: 560 rela = (const Elf_Rela *)(mapping + shdr[i].sh_offset); 561 relacnt = shdr[i].sh_size / sizeof(*rela); 562 } 563 } 564 565 for (i = 0; i < relacnt; i++, rela++) { 566 where = (Elf_Addr *)(mapping + rela->r_offset); 567 addend = rela->r_addend; 568 rtype = ELF_R_TYPE(rela->r_info); 569 symidx = ELF_R_SYM(rela->r_info); 570 571 switch (rtype) { 572 case R_AARCH64_NONE: /* none */ 573 break; 574 575 case R_AARCH64_RELATIVE: /* B + A */ 576 addr = (Elf_Addr)(mapping + addend); 577 if (*where != addr) 578 *where = addr; 579 break; 580 default: 581 printf("Linux Aarch64 vDSO: unexpected relocation type %ld, " 582 "symbol index %ld\n", rtype, symidx); 583 } 584 } 585 } 586 587 static Elf_Brandnote linux64_brandnote = { 588 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 589 .hdr.n_descsz = 16, 590 .hdr.n_type = 1, 591 .vendor = GNU_ABI_VENDOR, 592 .flags = BN_TRANSLATE_OSREL, 593 .trans_osrel = linux_trans_osrel 594 }; 595 596 static Elf64_Brandinfo linux_glibc2brand = { 597 .brand = ELFOSABI_LINUX, 598 .machine = EM_AARCH64, 599 .compat_3_brand = "Linux", 600 .interp_path = "/lib64/ld-linux-x86-64.so.2", 601 .sysvec = &elf_linux_sysvec, 602 .interp_newpath = NULL, 603 .brand_note = &linux64_brandnote, 604 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 605 }; 606 607 Elf64_Brandinfo *linux_brandlist[] = { 608 &linux_glibc2brand, 609 NULL 610 }; 611 612 static int 613 linux64_elf_modevent(module_t mod, int type, void *data) 614 { 615 Elf64_Brandinfo **brandinfo; 616 struct linux_ioctl_handler**lihp; 617 int error; 618 619 error = 0; 620 switch(type) { 621 case MOD_LOAD: 622 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 623 ++brandinfo) 624 if (elf64_insert_brand_entry(*brandinfo) < 0) 625 error = EINVAL; 626 if (error == 0) { 627 SET_FOREACH(lihp, linux_ioctl_handler_set) 628 linux_ioctl_register_handler(*lihp); 629 stclohz = (stathz ? stathz : hz); 630 if (bootverbose) 631 printf("Linux arm64 ELF exec handler installed\n"); 632 } 633 break; 634 case MOD_UNLOAD: 635 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 636 ++brandinfo) 637 if (elf64_brand_inuse(*brandinfo)) 638 error = EBUSY; 639 if (error == 0) { 640 for (brandinfo = &linux_brandlist[0]; 641 *brandinfo != NULL; ++brandinfo) 642 if (elf64_remove_brand_entry(*brandinfo) < 0) 643 error = EINVAL; 644 } 645 if (error == 0) { 646 SET_FOREACH(lihp, linux_ioctl_handler_set) 647 linux_ioctl_unregister_handler(*lihp); 648 if (bootverbose) 649 printf("Linux arm64 ELF exec handler removed\n"); 650 } else 651 printf("Could not deinstall Linux arm64 ELF interpreter entry\n"); 652 break; 653 default: 654 return (EOPNOTSUPP); 655 } 656 return (error); 657 } 658 659 static moduledata_t linux64_elf_mod = { 660 "linux64elf", 661 linux64_elf_modevent, 662 0 663 }; 664 665 DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 666 MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1); 667 FEATURE(linux64, "AArch64 Linux 64bit support"); 668