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 #define __ELF_WORD_SIZE 64 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/cdefs.h> 37 #include <sys/elf.h> 38 #include <sys/exec.h> 39 #include <sys/imgact.h> 40 #include <sys/imgact_elf.h> 41 #include <sys/kernel.h> 42 #include <sys/ktr.h> 43 #include <sys/lock.h> 44 #include <sys/module.h> 45 #include <sys/mutex.h> 46 #include <sys/proc.h> 47 #include <sys/stddef.h> 48 #include <sys/signalvar.h> 49 #include <sys/syscallsubr.h> 50 #include <sys/sysctl.h> 51 #include <sys/sysent.h> 52 53 #include <vm/vm.h> 54 #include <vm/pmap.h> 55 #include <vm/vm_map.h> 56 #include <vm/vm_extern.h> 57 #include <vm/vm_object.h> 58 #include <vm/vm_page.h> 59 #include <vm/vm_param.h> 60 61 #include <arm64/linux/linux.h> 62 #include <arm64/linux/linux_proto.h> 63 #include <compat/linux/linux_dtrace.h> 64 #include <compat/linux/linux_elf.h> 65 #include <compat/linux/linux_emul.h> 66 #include <compat/linux/linux_fork.h> 67 #include <compat/linux/linux_ioctl.h> 68 #include <compat/linux/linux_mib.h> 69 #include <compat/linux/linux_misc.h> 70 #include <compat/linux/linux_signal.h> 71 #include <compat/linux/linux_util.h> 72 #include <compat/linux/linux_vdso.h> 73 74 #include <arm64/linux/linux_sigframe.h> 75 76 #include <machine/md_var.h> 77 #include <machine/pcb.h> 78 #ifdef VFP 79 #include <machine/vfp.h> 80 #endif 81 82 MODULE_VERSION(linux64elf, 1); 83 84 #define LINUX_VDSOPAGE_SIZE PAGE_SIZE * 2 85 #define LINUX_VDSOPAGE (VM_MAXUSER_ADDRESS - \ 86 LINUX_VDSOPAGE_SIZE) 87 #define LINUX_SHAREDPAGE (LINUX_VDSOPAGE - PAGE_SIZE) 88 /* 89 * PAGE_SIZE - the size 90 * of the native SHAREDPAGE 91 */ 92 #define LINUX_USRSTACK LINUX_SHAREDPAGE 93 #define LINUX_PS_STRINGS (LINUX_USRSTACK - \ 94 sizeof(struct ps_strings)) 95 96 static int linux_szsigcode; 97 static vm_object_t linux_vdso_obj; 98 static char *linux_vdso_mapping; 99 extern char _binary_linux_vdso_so_o_start; 100 extern char _binary_linux_vdso_so_o_end; 101 static vm_offset_t linux_vdso_base; 102 103 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 104 extern const char *linux_syscallnames[]; 105 106 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 107 108 static void linux_vdso_install(const void *param); 109 static void linux_vdso_deinstall(const void *param); 110 static void linux_vdso_reloc(char *mapping, Elf_Addr offset); 111 static void linux_set_syscall_retval(struct thread *td, int error); 112 static int linux_fetch_syscall_args(struct thread *td); 113 static void linux_exec_setregs(struct thread *td, struct image_params *imgp, 114 uintptr_t stack); 115 static void linux_exec_sysvec_init(void *param); 116 static int linux_on_exec_vmspace(struct proc *p, 117 struct image_params *imgp); 118 119 /* DTrace init */ 120 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE); 121 122 /* DTrace probes */ 123 LIN_SDT_PROBE_DEFINE0(sysvec, linux_exec_setregs, todo); 124 LIN_SDT_PROBE_DEFINE0(sysvec, linux_copyout_auxargs, todo); 125 126 LINUX_VDSO_SYM_CHAR(linux_platform); 127 LINUX_VDSO_SYM_INTPTR(kern_timekeep_base); 128 LINUX_VDSO_SYM_INTPTR(linux_vdso_sigcode); 129 130 static int 131 linux_fetch_syscall_args(struct thread *td) 132 { 133 struct proc *p; 134 struct syscall_args *sa; 135 register_t *ap; 136 137 p = td->td_proc; 138 ap = td->td_frame->tf_x; 139 sa = &td->td_sa; 140 141 sa->code = td->td_frame->tf_x[8]; 142 sa->original_code = sa->code; 143 /* LINUXTODO: generic syscall? */ 144 if (sa->code >= p->p_sysent->sv_size) 145 sa->callp = &p->p_sysent->sv_table[0]; 146 else 147 sa->callp = &p->p_sysent->sv_table[sa->code]; 148 149 if (sa->callp->sy_narg > nitems(sa->args)) 150 panic("ARM64TODO: Could we have more than %zu args?", 151 nitems(sa->args)); 152 memcpy(sa->args, ap, nitems(sa->args) * sizeof(register_t)); 153 154 td->td_retval[0] = 0; 155 return (0); 156 } 157 158 static void 159 linux_set_syscall_retval(struct thread *td, int error) 160 { 161 162 td->td_retval[1] = td->td_frame->tf_x[1]; 163 cpu_set_syscall_retval(td, error); 164 165 if (__predict_false(error != 0)) { 166 if (error != ERESTART && error != EJUSTRETURN) 167 td->td_frame->tf_x[0] = bsd_to_linux_errno(error); 168 } 169 } 170 171 static int 172 linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) 173 { 174 Elf_Auxargs *args; 175 Elf_Auxinfo *argarray, *pos; 176 struct proc *p; 177 int error, issetugid; 178 179 LIN_SDT_PROBE0(sysvec, linux_copyout_auxargs, todo); 180 p = imgp->proc; 181 182 args = (Elf64_Auxargs *)imgp->auxargs; 183 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 184 M_WAITOK | M_ZERO); 185 186 issetugid = p->p_flag & P_SUGID ? 1 : 0; 187 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base); 188 AUXARGS_ENTRY(pos, LINUX_AT_MINSIGSTKSZ, LINUX_MINSIGSTKSZ); 189 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, *imgp->sysent->sv_hwcap); 190 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 191 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 192 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 193 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 194 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 195 AUXARGS_ENTRY(pos, AT_BASE, args->base); 196 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 197 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 198 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 199 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 200 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 201 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 202 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 203 AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary); 204 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, *imgp->sysent->sv_hwcap2); 205 if (imgp->execpathp != 0) 206 AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp); 207 if (args->execfd != -1) 208 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 209 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 210 AUXARGS_ENTRY(pos, AT_NULL, 0); 211 212 free(imgp->auxargs, M_TEMP); 213 imgp->auxargs = NULL; 214 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 215 216 error = copyout(argarray, (void *)base, 217 sizeof(*argarray) * LINUX_AT_COUNT); 218 free(argarray, M_TEMP); 219 return (error); 220 } 221 222 /* 223 * Reset registers to default values on exec. 224 */ 225 static void 226 linux_exec_setregs(struct thread *td, struct image_params *imgp, 227 uintptr_t stack) 228 { 229 struct trapframe *regs = td->td_frame; 230 struct pcb *pcb = td->td_pcb; 231 232 /* LINUXTODO: validate */ 233 LIN_SDT_PROBE0(sysvec, linux_exec_setregs, todo); 234 235 memset(regs, 0, sizeof(*regs)); 236 /* glibc start.S registers function pointer in x0 with atexit. */ 237 regs->tf_sp = stack; 238 #if 0 /* LINUXTODO: See if this is used. */ 239 regs->tf_lr = imgp->entry_addr; 240 #else 241 regs->tf_lr = 0xffffffffffffffff; 242 #endif 243 regs->tf_elr = imgp->entry_addr; 244 245 pcb->pcb_tpidr_el0 = 0; 246 pcb->pcb_tpidrro_el0 = 0; 247 WRITE_SPECIALREG(tpidrro_el0, 0); 248 WRITE_SPECIALREG(tpidr_el0, 0); 249 250 #ifdef VFP 251 vfp_reset_state(td, pcb); 252 #endif 253 254 /* 255 * Clear debug register state. It is not applicable to the new process. 256 */ 257 bzero(&pcb->pcb_dbg_regs, sizeof(pcb->pcb_dbg_regs)); 258 } 259 260 int 261 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 262 { 263 struct l_sigframe *frame; 264 ucontext_t uc; 265 struct trapframe *tf; 266 int error; 267 268 tf = td->td_frame; 269 frame = (struct l_sigframe *)tf->tf_sp; 270 271 if (copyin((void *)&frame->uc, &uc, sizeof(uc))) 272 return (EFAULT); 273 274 error = set_mcontext(td, &uc.uc_mcontext); 275 if (error != 0) 276 return (error); 277 278 /* Restore signal mask. */ 279 kern_sigprocmask(td, SIG_SETMASK, &uc.uc_sigmask, NULL, 0); 280 281 return (EJUSTRETURN); 282 } 283 284 static void 285 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 286 { 287 struct thread *td; 288 struct proc *p; 289 struct trapframe *tf; 290 struct l_sigframe *fp, *frame; 291 struct l_fpsimd_context *fpsimd; 292 struct l_esr_context *esr; 293 l_stack_t uc_stack; 294 ucontext_t uc; 295 uint8_t *scr; 296 struct sigacts *psp; 297 int onstack, sig, issiginfo; 298 299 td = curthread; 300 p = td->td_proc; 301 PROC_LOCK_ASSERT(p, MA_OWNED); 302 303 sig = ksi->ksi_signo; 304 psp = p->p_sigacts; 305 mtx_assert(&psp->ps_mtx, MA_OWNED); 306 307 tf = td->td_frame; 308 onstack = sigonstack(tf->tf_sp); 309 issiginfo = SIGISMEMBER(psp->ps_siginfo, sig); 310 311 CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm, 312 catcher, sig); 313 314 /* Allocate and validate space for the signal handler context. */ 315 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !onstack && 316 SIGISMEMBER(psp->ps_sigonstack, sig)) { 317 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 318 td->td_sigstk.ss_size); 319 #if defined(COMPAT_43) 320 td->td_sigstk.ss_flags |= SS_ONSTACK; 321 #endif 322 } else { 323 fp = (struct l_sigframe *)td->td_frame->tf_sp; 324 } 325 326 /* Make room, keeping the stack aligned */ 327 fp--; 328 fp = (struct l_sigframe *)STACKALIGN(fp); 329 330 get_mcontext(td, &uc.uc_mcontext, 0); 331 uc.uc_sigmask = *mask; 332 333 uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 334 uc_stack.ss_size = td->td_sigstk.ss_size; 335 uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) != 0 ? 336 (onstack ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 337 mtx_unlock(&psp->ps_mtx); 338 PROC_UNLOCK(td->td_proc); 339 340 /* Fill in the frame to copy out */ 341 frame = malloc(sizeof(*frame), M_LINUX, M_WAITOK | M_ZERO); 342 343 memcpy(&frame->sf.sf_uc.uc_sc.regs, tf->tf_x, sizeof(tf->tf_x)); 344 frame->sf.sf_uc.uc_sc.regs[30] = tf->tf_lr; 345 frame->sf.sf_uc.uc_sc.sp = tf->tf_sp; 346 frame->sf.sf_uc.uc_sc.pc = tf->tf_lr; 347 frame->sf.sf_uc.uc_sc.pstate = tf->tf_spsr; 348 frame->sf.sf_uc.uc_sc.fault_address = (register_t)ksi->ksi_addr; 349 350 /* Stack frame for unwinding */ 351 frame->fp = tf->tf_x[29]; 352 frame->lr = tf->tf_lr; 353 354 /* Translate the signal. */ 355 sig = bsd_to_linux_signal(sig); 356 siginfo_to_lsiginfo(&ksi->ksi_info, &frame->sf.sf_si, sig); 357 bsd_to_linux_sigset(mask, &frame->sf.sf_uc.uc_sigmask); 358 359 /* 360 * Prepare fpsimd & esr. Does not check sizes, as 361 * __reserved is big enougth. 362 */ 363 scr = (uint8_t *)&frame->sf.sf_uc.uc_sc.__reserved; 364 #ifdef VFP 365 fpsimd = (struct l_fpsimd_context *) scr; 366 fpsimd->head.magic = L_FPSIMD_MAGIC; 367 fpsimd->head.size = sizeof(struct l_fpsimd_context); 368 fpsimd->fpsr = uc.uc_mcontext.mc_fpregs.fp_sr; 369 fpsimd->fpcr = uc.uc_mcontext.mc_fpregs.fp_cr; 370 371 memcpy(fpsimd->vregs, &uc.uc_mcontext.mc_fpregs.fp_q, 372 sizeof(uc.uc_mcontext.mc_fpregs.fp_q)); 373 scr += roundup(sizeof(struct l_fpsimd_context), 16); 374 #endif 375 if (ksi->ksi_addr != 0) { 376 esr = (struct l_esr_context *) scr; 377 esr->head.magic = L_ESR_MAGIC; 378 esr->head.size = sizeof(struct l_esr_context); 379 esr->esr = tf->tf_esr; 380 } 381 382 memcpy(&frame->sf.sf_uc.uc_stack, &uc_stack, sizeof(uc_stack)); 383 memcpy(&frame->uc, &uc, sizeof(uc)); 384 385 /* Copy the sigframe out to the user's stack. */ 386 if (copyout(frame, fp, sizeof(*fp)) != 0) { 387 /* Process has trashed its stack. Kill it. */ 388 free(frame, M_LINUX); 389 CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp); 390 PROC_LOCK(p); 391 sigexit(td, SIGILL); 392 } 393 free(frame, M_LINUX); 394 395 tf->tf_x[0]= sig; 396 if (issiginfo) { 397 tf->tf_x[1] = (register_t)&fp->sf.sf_si; 398 tf->tf_x[2] = (register_t)&fp->sf.sf_uc; 399 } else { 400 tf->tf_x[1] = 0; 401 tf->tf_x[2] = 0; 402 } 403 tf->tf_x[8] = (register_t)catcher; 404 tf->tf_sp = (register_t)fp; 405 tf->tf_elr = (register_t)linux_vdso_sigcode; 406 407 CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_elr, 408 tf->tf_sp); 409 410 PROC_LOCK(p); 411 mtx_lock(&psp->ps_mtx); 412 } 413 414 struct sysentvec elf_linux_sysvec = { 415 .sv_size = LINUX_SYS_MAXSYSCALL, 416 .sv_table = linux_sysent, 417 .sv_fixup = __elfN(freebsd_fixup), 418 .sv_sendsig = linux_rt_sendsig, 419 .sv_sigcode = &_binary_linux_vdso_so_o_start, 420 .sv_szsigcode = &linux_szsigcode, 421 .sv_name = "Linux ELF64", 422 .sv_coredump = elf64_coredump, 423 .sv_elf_core_osabi = ELFOSABI_NONE, 424 .sv_elf_core_abi_vendor = LINUX_ABI_VENDOR, 425 .sv_elf_core_prepare_notes = linux64_prepare_notes, 426 .sv_imgact_try = linux_exec_imgact_try, 427 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 428 .sv_minuser = VM_MIN_ADDRESS, 429 .sv_maxuser = VM_MAXUSER_ADDRESS, 430 .sv_usrstack = LINUX_USRSTACK, 431 .sv_psstrings = LINUX_PS_STRINGS, 432 .sv_psstringssz = sizeof(struct ps_strings), 433 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, 434 .sv_copyout_auxargs = linux_copyout_auxargs, 435 .sv_copyout_strings = __linuxN(copyout_strings), 436 .sv_setregs = linux_exec_setregs, 437 .sv_fixlimit = NULL, 438 .sv_maxssiz = NULL, 439 .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP | SV_SIG_DISCIGN | 440 SV_SIG_WAITNDQ | SV_TIMEKEEP, 441 .sv_set_syscall_retval = linux_set_syscall_retval, 442 .sv_fetch_syscall_args = linux_fetch_syscall_args, 443 .sv_syscallnames = linux_syscallnames, 444 .sv_shared_page_base = LINUX_SHAREDPAGE, 445 .sv_shared_page_len = PAGE_SIZE, 446 .sv_schedtail = linux_schedtail, 447 .sv_thread_detach = linux_thread_detach, 448 .sv_trap = NULL, 449 .sv_hwcap = &elf_hwcap, 450 .sv_hwcap2 = &elf_hwcap2, 451 .sv_onexec = linux_on_exec_vmspace, 452 .sv_onexit = linux_on_exit, 453 .sv_ontdexit = linux_thread_dtor, 454 .sv_setid_allowed = &linux_setid_allowed_query, 455 }; 456 457 static int 458 linux_on_exec_vmspace(struct proc *p, struct image_params *imgp) 459 { 460 int error; 461 462 error = linux_map_vdso(p, linux_vdso_obj, linux_vdso_base, 463 LINUX_VDSOPAGE_SIZE, imgp); 464 if (error == 0) 465 linux_on_exec(p, imgp); 466 return (error); 467 } 468 469 /* 470 * linux_vdso_install() and linux_exec_sysvec_init() must be called 471 * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY). 472 */ 473 static void 474 linux_exec_sysvec_init(void *param) 475 { 476 l_uintptr_t *ktimekeep_base; 477 struct sysentvec *sv; 478 ptrdiff_t tkoff; 479 480 sv = param; 481 /* Fill timekeep_base */ 482 exec_sysvec_init(sv); 483 484 tkoff = kern_timekeep_base - linux_vdso_base; 485 ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 486 *ktimekeep_base = sv->sv_shared_page_base + sv->sv_timekeep_offset; 487 } 488 SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY, 489 linux_exec_sysvec_init, &elf_linux_sysvec); 490 491 static void 492 linux_vdso_install(const void *param) 493 { 494 char *vdso_start = &_binary_linux_vdso_so_o_start; 495 char *vdso_end = &_binary_linux_vdso_so_o_end; 496 497 linux_szsigcode = vdso_end - vdso_start; 498 MPASS(linux_szsigcode <= LINUX_VDSOPAGE_SIZE); 499 500 linux_vdso_base = LINUX_VDSOPAGE; 501 502 __elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base); 503 504 linux_vdso_obj = __elfN(linux_shared_page_init) 505 (&linux_vdso_mapping, LINUX_VDSOPAGE_SIZE); 506 bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode); 507 508 linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base); 509 } 510 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST, 511 linux_vdso_install, NULL); 512 513 static void 514 linux_vdso_deinstall(const void *param) 515 { 516 517 __elfN(linux_shared_page_fini)(linux_vdso_obj, 518 linux_vdso_mapping, LINUX_VDSOPAGE_SIZE); 519 } 520 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 521 linux_vdso_deinstall, NULL); 522 523 static void 524 linux_vdso_reloc(char *mapping, Elf_Addr offset) 525 { 526 Elf_Size rtype, symidx; 527 const Elf_Rela *rela; 528 const Elf_Shdr *shdr; 529 const Elf_Ehdr *ehdr; 530 Elf_Addr *where; 531 Elf_Addr addr, addend; 532 int i, relacnt; 533 534 MPASS(offset != 0); 535 536 relacnt = 0; 537 ehdr = (const Elf_Ehdr *)mapping; 538 shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff); 539 for (i = 0; i < ehdr->e_shnum; i++) 540 { 541 switch (shdr[i].sh_type) { 542 case SHT_REL: 543 printf("Linux Aarch64 vDSO: unexpected Rel section\n"); 544 break; 545 case SHT_RELA: 546 rela = (const Elf_Rela *)(mapping + shdr[i].sh_offset); 547 relacnt = shdr[i].sh_size / sizeof(*rela); 548 } 549 } 550 551 for (i = 0; i < relacnt; i++, rela++) { 552 where = (Elf_Addr *)(mapping + rela->r_offset); 553 addend = rela->r_addend; 554 rtype = ELF_R_TYPE(rela->r_info); 555 symidx = ELF_R_SYM(rela->r_info); 556 557 switch (rtype) { 558 case R_AARCH64_NONE: /* none */ 559 break; 560 561 case R_AARCH64_RELATIVE: /* B + A */ 562 addr = (Elf_Addr)(mapping + addend); 563 if (*where != addr) 564 *where = addr; 565 break; 566 default: 567 printf("Linux Aarch64 vDSO: unexpected relocation type %ld, " 568 "symbol index %ld\n", rtype, symidx); 569 } 570 } 571 } 572 573 static Elf_Brandnote linux64_brandnote = { 574 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 575 .hdr.n_descsz = 16, 576 .hdr.n_type = 1, 577 .vendor = GNU_ABI_VENDOR, 578 .flags = BN_TRANSLATE_OSREL, 579 .trans_osrel = linux_trans_osrel 580 }; 581 582 static Elf64_Brandinfo linux_glibc2brand = { 583 .brand = ELFOSABI_LINUX, 584 .machine = EM_AARCH64, 585 .compat_3_brand = "Linux", 586 .emul_path = linux_emul_path, 587 .interp_path = "/lib64/ld-linux-x86-64.so.2", 588 .sysvec = &elf_linux_sysvec, 589 .interp_newpath = NULL, 590 .brand_note = &linux64_brandnote, 591 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 592 }; 593 594 Elf64_Brandinfo *linux_brandlist[] = { 595 &linux_glibc2brand, 596 NULL 597 }; 598 599 static int 600 linux64_elf_modevent(module_t mod, int type, void *data) 601 { 602 Elf64_Brandinfo **brandinfo; 603 struct linux_ioctl_handler**lihp; 604 int error; 605 606 error = 0; 607 switch(type) { 608 case MOD_LOAD: 609 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 610 ++brandinfo) 611 if (elf64_insert_brand_entry(*brandinfo) < 0) 612 error = EINVAL; 613 if (error == 0) { 614 SET_FOREACH(lihp, linux_ioctl_handler_set) 615 linux_ioctl_register_handler(*lihp); 616 stclohz = (stathz ? stathz : hz); 617 if (bootverbose) 618 printf("Linux arm64 ELF exec handler installed\n"); 619 } 620 break; 621 case MOD_UNLOAD: 622 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 623 ++brandinfo) 624 if (elf64_brand_inuse(*brandinfo)) 625 error = EBUSY; 626 if (error == 0) { 627 for (brandinfo = &linux_brandlist[0]; 628 *brandinfo != NULL; ++brandinfo) 629 if (elf64_remove_brand_entry(*brandinfo) < 0) 630 error = EINVAL; 631 } 632 if (error == 0) { 633 SET_FOREACH(lihp, linux_ioctl_handler_set) 634 linux_ioctl_unregister_handler(*lihp); 635 if (bootverbose) 636 printf("Linux arm64 ELF exec handler removed\n"); 637 } else 638 printf("Could not deinstall Linux arm64 ELF interpreter entry\n"); 639 break; 640 default: 641 return (EOPNOTSUPP); 642 } 643 return (error); 644 } 645 646 static moduledata_t linux64_elf_mod = { 647 "linux64elf", 648 linux64_elf_modevent, 649 0 650 }; 651 652 DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 653 MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1); 654 FEATURE(linux64, "AArch64 Linux 64bit support"); 655