Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/linux/linux_sysvec.c
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1 /*- 2 * Copyright (c) 1994-1996 Søren Schmidt 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/10.4/sys/i386/linux/linux_sysvec.c 321024 2017-07-15 18:05:28Z dchagin $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/exec.h> 35 #include <sys/fcntl.h> 36 #include <sys/imgact.h> 37 #include <sys/imgact_aout.h> 38 #include <sys/imgact_elf.h> 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/malloc.h> 42 #include <sys/module.h> 43 #include <sys/mutex.h> 44 #include <sys/proc.h> 45 #include <sys/signalvar.h> 46 #include <sys/syscallsubr.h> 47 #include <sys/sysctl.h> 48 #include <sys/sysent.h> 49 #include <sys/sysproto.h> 50 #include <sys/vnode.h> 51 #include <sys/eventhandler.h> 52 53 #include <vm/vm.h> 54 #include <vm/pmap.h> 55 #include <vm/vm_extern.h> 56 #include <vm/vm_map.h> 57 #include <vm/vm_object.h> 58 #include <vm/vm_page.h> 59 #include <vm/vm_param.h> 60 61 #include <machine/cpu.h> 62 #include <machine/cputypes.h> 63 #include <machine/md_var.h> 64 #include <machine/pcb.h> 65 66 #include <i386/linux/linux.h> 67 #include <i386/linux/linux_proto.h> 68 #include <compat/linux/linux_emul.h> 69 #include <compat/linux/linux_futex.h> 70 #include <compat/linux/linux_ioctl.h> 71 #include <compat/linux/linux_mib.h> 72 #include <compat/linux/linux_misc.h> 73 #include <compat/linux/linux_signal.h> 74 #include <compat/linux/linux_util.h> 75 #include <compat/linux/linux_vdso.h> 76 77 MODULE_VERSION(linux, 1); 78 79 #if BYTE_ORDER == LITTLE_ENDIAN 80 #define SHELLMAGIC 0x2123 /* #! */ 81 #else 82 #define SHELLMAGIC 0x2321 83 #endif 84 85 #if defined(DEBUG) 86 SYSCTL_PROC(_compat_linux, OID_AUTO, debug, 87 CTLTYPE_STRING | CTLFLAG_RW, 88 0, 0, linux_sysctl_debug, "A", 89 "Linux debugging control"); 90 #endif 91 92 /* 93 * Allow the sendsig functions to use the ldebug() facility 94 * even though they are not syscalls themselves. Map them 95 * to syscall 0. This is slightly less bogus than using 96 * ldebug(sigreturn). 97 */ 98 #define LINUX_SYS_linux_rt_sendsig 0 99 #define LINUX_SYS_linux_sendsig 0 100 101 #define LINUX_PS_STRINGS (LINUX_USRSTACK - sizeof(struct ps_strings)) 102 103 static int linux_szsigcode; 104 static vm_object_t linux_shared_page_obj; 105 static char *linux_shared_page_mapping; 106 extern char _binary_linux_locore_o_start; 107 extern char _binary_linux_locore_o_end; 108 109 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 110 111 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 112 113 static int linux_fixup(register_t **stack_base, 114 struct image_params *iparams); 115 static int elf_linux_fixup(register_t **stack_base, 116 struct image_params *iparams); 117 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 118 static void exec_linux_setregs(struct thread *td, 119 struct image_params *imgp, u_long stack); 120 static register_t *linux_copyout_strings(struct image_params *imgp); 121 static boolean_t linux_trans_osrel(const Elf_Note *note, int32_t *osrel); 122 static void linux_vdso_install(void *param); 123 static void linux_vdso_deinstall(void *param); 124 125 static int linux_szplatform; 126 const char *linux_kplatform; 127 128 static eventhandler_tag linux_exit_tag; 129 static eventhandler_tag linux_exec_tag; 130 static eventhandler_tag linux_thread_dtor_tag; 131 132 /* 133 * Linux syscalls return negative errno's, we do positive and map them 134 * Reference: 135 * FreeBSD: src/sys/sys/errno.h 136 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h 137 * linux-2.6.17.8/include/asm-generic/errno.h 138 */ 139 static int bsd_to_linux_errno[ELAST + 1] = { 140 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 141 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19, 142 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, 143 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89, 144 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99, 145 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109, 146 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122, 147 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9, 148 -6, -6, -43, -42, -75,-125, -84, -95, -16, -74, 149 -72, -67, -71 150 }; 151 152 #define LINUX_T_UNKNOWN 255 153 static int _bsd_to_linux_trapcode[] = { 154 LINUX_T_UNKNOWN, /* 0 */ 155 6, /* 1 T_PRIVINFLT */ 156 LINUX_T_UNKNOWN, /* 2 */ 157 3, /* 3 T_BPTFLT */ 158 LINUX_T_UNKNOWN, /* 4 */ 159 LINUX_T_UNKNOWN, /* 5 */ 160 16, /* 6 T_ARITHTRAP */ 161 254, /* 7 T_ASTFLT */ 162 LINUX_T_UNKNOWN, /* 8 */ 163 13, /* 9 T_PROTFLT */ 164 1, /* 10 T_TRCTRAP */ 165 LINUX_T_UNKNOWN, /* 11 */ 166 14, /* 12 T_PAGEFLT */ 167 LINUX_T_UNKNOWN, /* 13 */ 168 17, /* 14 T_ALIGNFLT */ 169 LINUX_T_UNKNOWN, /* 15 */ 170 LINUX_T_UNKNOWN, /* 16 */ 171 LINUX_T_UNKNOWN, /* 17 */ 172 0, /* 18 T_DIVIDE */ 173 2, /* 19 T_NMI */ 174 4, /* 20 T_OFLOW */ 175 5, /* 21 T_BOUND */ 176 7, /* 22 T_DNA */ 177 8, /* 23 T_DOUBLEFLT */ 178 9, /* 24 T_FPOPFLT */ 179 10, /* 25 T_TSSFLT */ 180 11, /* 26 T_SEGNPFLT */ 181 12, /* 27 T_STKFLT */ 182 18, /* 28 T_MCHK */ 183 19, /* 29 T_XMMFLT */ 184 15 /* 30 T_RESERVED */ 185 }; 186 #define bsd_to_linux_trapcode(code) \ 187 ((code)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \ 188 _bsd_to_linux_trapcode[(code)]: \ 189 LINUX_T_UNKNOWN) 190 191 LINUX_VDSO_SYM_INTPTR(linux_sigcode); 192 LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode); 193 LINUX_VDSO_SYM_INTPTR(linux_vsyscall); 194 195 /* 196 * If FreeBSD & Linux have a difference of opinion about what a trap 197 * means, deal with it here. 198 * 199 * MPSAFE 200 */ 201 static int 202 translate_traps(int signal, int trap_code) 203 { 204 if (signal != SIGBUS) 205 return (signal); 206 switch (trap_code) { 207 case T_PROTFLT: 208 case T_TSSFLT: 209 case T_DOUBLEFLT: 210 case T_PAGEFLT: 211 return (SIGSEGV); 212 default: 213 return (signal); 214 } 215 } 216 217 static int 218 linux_fixup(register_t **stack_base, struct image_params *imgp) 219 { 220 register_t *argv, *envp; 221 222 argv = *stack_base; 223 envp = *stack_base + (imgp->args->argc + 1); 224 (*stack_base)--; 225 suword(*stack_base, (intptr_t)(void *)envp); 226 (*stack_base)--; 227 suword(*stack_base, (intptr_t)(void *)argv); 228 (*stack_base)--; 229 suword(*stack_base, imgp->args->argc); 230 return (0); 231 } 232 233 static int 234 elf_linux_fixup(register_t **stack_base, struct image_params *imgp) 235 { 236 struct proc *p; 237 Elf32_Auxargs *args; 238 Elf32_Addr *uplatform; 239 struct ps_strings *arginfo; 240 register_t *pos; 241 int issetugid; 242 243 KASSERT(curthread->td_proc == imgp->proc, 244 ("unsafe elf_linux_fixup(), should be curproc")); 245 246 p = imgp->proc; 247 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 248 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 249 uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform); 250 args = (Elf32_Auxargs *)imgp->auxargs; 251 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 252 253 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, 254 imgp->proc->p_sysent->sv_shared_page_base); 255 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux_vsyscall); 256 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 257 258 /* 259 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 260 * as it has appeared in the 2.4.0-rc7 first time. 261 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 262 * glibc falls back to the hard-coded CLK_TCK value when aux entry 263 * is not present. 264 * Also see linux_times() implementation. 265 */ 266 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 267 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 268 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 269 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 270 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 271 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 272 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 273 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 274 AUXARGS_ENTRY(pos, AT_BASE, args->base); 275 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 276 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 277 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 278 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 279 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 280 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(uplatform)); 281 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary); 282 if (imgp->execpathp != 0) 283 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp); 284 if (args->execfd != -1) 285 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 286 AUXARGS_ENTRY(pos, AT_NULL, 0); 287 288 free(imgp->auxargs, M_TEMP); 289 imgp->auxargs = NULL; 290 291 (*stack_base)--; 292 suword(*stack_base, (register_t)imgp->args->argc); 293 return (0); 294 } 295 296 /* 297 * Copied from kern/kern_exec.c 298 */ 299 static register_t * 300 linux_copyout_strings(struct image_params *imgp) 301 { 302 int argc, envc; 303 char **vectp; 304 char *stringp, *destp; 305 register_t *stack_base; 306 struct ps_strings *arginfo; 307 char canary[LINUX_AT_RANDOM_LEN]; 308 size_t execpath_len; 309 struct proc *p; 310 311 /* 312 * Calculate string base and vector table pointers. 313 */ 314 p = imgp->proc; 315 if (imgp->execpath != NULL && imgp->auxargs != NULL) 316 execpath_len = strlen(imgp->execpath) + 1; 317 else 318 execpath_len = 0; 319 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 320 destp = (caddr_t)arginfo - SPARE_USRSPACE - linux_szplatform - 321 roundup(sizeof(canary), sizeof(char *)) - 322 roundup(execpath_len, sizeof(char *)) - 323 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *)); 324 325 /* 326 * install LINUX_PLATFORM 327 */ 328 copyout(linux_kplatform, ((caddr_t)arginfo - linux_szplatform), 329 linux_szplatform); 330 331 if (execpath_len != 0) { 332 imgp->execpathp = (uintptr_t)arginfo - 333 linux_szplatform - execpath_len; 334 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len); 335 } 336 337 /* 338 * Prepare the canary for SSP. 339 */ 340 arc4rand(canary, sizeof(canary), 0); 341 imgp->canary = (uintptr_t)arginfo - linux_szplatform - 342 roundup(execpath_len, sizeof(char *)) - 343 roundup(sizeof(canary), sizeof(char *)); 344 copyout(canary, (void *)imgp->canary, sizeof(canary)); 345 346 /* 347 * If we have a valid auxargs ptr, prepare some room 348 * on the stack. 349 */ 350 if (imgp->auxargs) { 351 /* 352 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 353 * lower compatibility. 354 */ 355 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 356 (LINUX_AT_COUNT * 2); 357 /* 358 * The '+ 2' is for the null pointers at the end of each of 359 * the arg and env vector sets,and imgp->auxarg_size is room 360 * for argument of Runtime loader. 361 */ 362 vectp = (char **)(destp - (imgp->args->argc + 363 imgp->args->envc + 2 + imgp->auxarg_size) * sizeof(char *)); 364 } else { 365 /* 366 * The '+ 2' is for the null pointers at the end of each of 367 * the arg and env vector sets 368 */ 369 vectp = (char **)(destp - (imgp->args->argc + imgp->args->envc + 2) * 370 sizeof(char *)); 371 } 372 373 /* 374 * vectp also becomes our initial stack base 375 */ 376 stack_base = (register_t *)vectp; 377 378 stringp = imgp->args->begin_argv; 379 argc = imgp->args->argc; 380 envc = imgp->args->envc; 381 382 /* 383 * Copy out strings - arguments and environment. 384 */ 385 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 386 387 /* 388 * Fill in "ps_strings" struct for ps, w, etc. 389 */ 390 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp); 391 suword(&arginfo->ps_nargvstr, argc); 392 393 /* 394 * Fill in argument portion of vector table. 395 */ 396 for (; argc > 0; --argc) { 397 suword(vectp++, (long)(intptr_t)destp); 398 while (*stringp++ != 0) 399 destp++; 400 destp++; 401 } 402 403 /* a null vector table pointer separates the argp's from the envp's */ 404 suword(vectp++, 0); 405 406 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp); 407 suword(&arginfo->ps_nenvstr, envc); 408 409 /* 410 * Fill in environment portion of vector table. 411 */ 412 for (; envc > 0; --envc) { 413 suword(vectp++, (long)(intptr_t)destp); 414 while (*stringp++ != 0) 415 destp++; 416 destp++; 417 } 418 419 /* end of vector table is a null pointer */ 420 suword(vectp, 0); 421 422 return (stack_base); 423 } 424 425 static void 426 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 427 { 428 struct thread *td = curthread; 429 struct proc *p = td->td_proc; 430 struct sigacts *psp; 431 struct trapframe *regs; 432 struct l_rt_sigframe *fp, frame; 433 int sig, code; 434 int oonstack; 435 436 sig = ksi->ksi_signo; 437 code = ksi->ksi_code; 438 PROC_LOCK_ASSERT(p, MA_OWNED); 439 psp = p->p_sigacts; 440 mtx_assert(&psp->ps_mtx, MA_OWNED); 441 regs = td->td_frame; 442 oonstack = sigonstack(regs->tf_esp); 443 444 #ifdef DEBUG 445 if (ldebug(rt_sendsig)) 446 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 447 catcher, sig, (void*)mask, code); 448 #endif 449 /* 450 * Allocate space for the signal handler context. 451 */ 452 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 453 SIGISMEMBER(psp->ps_sigonstack, sig)) { 454 fp = (struct l_rt_sigframe *)(td->td_sigstk.ss_sp + 455 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 456 } else 457 fp = (struct l_rt_sigframe *)regs->tf_esp - 1; 458 mtx_unlock(&psp->ps_mtx); 459 460 /* 461 * Build the argument list for the signal handler. 462 */ 463 sig = bsd_to_linux_signal(sig); 464 465 bzero(&frame, sizeof(frame)); 466 467 frame.sf_handler = catcher; 468 frame.sf_sig = sig; 469 frame.sf_siginfo = &fp->sf_si; 470 frame.sf_ucontext = &fp->sf_sc; 471 472 /* Fill in POSIX parts */ 473 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 474 475 /* 476 * Build the signal context to be used by sigreturn. 477 */ 478 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 479 frame.sf_sc.uc_link = NULL; /* XXX ??? */ 480 481 frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp; 482 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 483 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 484 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 485 PROC_UNLOCK(p); 486 487 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 488 489 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 490 frame.sf_sc.uc_mcontext.sc_gs = rgs(); 491 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 492 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 493 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 494 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi; 495 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi; 496 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp; 497 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx; 498 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_esp; 499 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx; 500 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx; 501 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax; 502 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip; 503 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 504 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags; 505 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp; 506 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 507 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 508 frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; 509 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 510 511 #ifdef DEBUG 512 if (ldebug(rt_sendsig)) 513 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 514 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 515 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 516 #endif 517 518 if (copyout(&frame, fp, sizeof(frame)) != 0) { 519 /* 520 * Process has trashed its stack; give it an illegal 521 * instruction to halt it in its tracks. 522 */ 523 #ifdef DEBUG 524 if (ldebug(rt_sendsig)) 525 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 526 fp, oonstack); 527 #endif 528 PROC_LOCK(p); 529 sigexit(td, SIGILL); 530 } 531 532 /* 533 * Build context to run handler in. 534 */ 535 regs->tf_esp = (int)fp; 536 regs->tf_eip = linux_rt_sigcode; 537 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 538 regs->tf_cs = _ucodesel; 539 regs->tf_ds = _udatasel; 540 regs->tf_es = _udatasel; 541 regs->tf_fs = _udatasel; 542 regs->tf_ss = _udatasel; 543 PROC_LOCK(p); 544 mtx_lock(&psp->ps_mtx); 545 } 546 547 548 /* 549 * Send an interrupt to process. 550 * 551 * Stack is set up to allow sigcode stored 552 * in u. to call routine, followed by kcall 553 * to sigreturn routine below. After sigreturn 554 * resets the signal mask, the stack, and the 555 * frame pointer, it returns to the user 556 * specified pc, psl. 557 */ 558 static void 559 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 560 { 561 struct thread *td = curthread; 562 struct proc *p = td->td_proc; 563 struct sigacts *psp; 564 struct trapframe *regs; 565 struct l_sigframe *fp, frame; 566 l_sigset_t lmask; 567 int sig, code; 568 int oonstack; 569 570 PROC_LOCK_ASSERT(p, MA_OWNED); 571 psp = p->p_sigacts; 572 sig = ksi->ksi_signo; 573 code = ksi->ksi_code; 574 mtx_assert(&psp->ps_mtx, MA_OWNED); 575 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 576 /* Signal handler installed with SA_SIGINFO. */ 577 linux_rt_sendsig(catcher, ksi, mask); 578 return; 579 } 580 regs = td->td_frame; 581 oonstack = sigonstack(regs->tf_esp); 582 583 #ifdef DEBUG 584 if (ldebug(sendsig)) 585 printf(ARGS(sendsig, "%p, %d, %p, %u"), 586 catcher, sig, (void*)mask, code); 587 #endif 588 589 /* 590 * Allocate space for the signal handler context. 591 */ 592 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 593 SIGISMEMBER(psp->ps_sigonstack, sig)) { 594 fp = (struct l_sigframe *)(td->td_sigstk.ss_sp + 595 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 596 } else 597 fp = (struct l_sigframe *)regs->tf_esp - 1; 598 mtx_unlock(&psp->ps_mtx); 599 PROC_UNLOCK(p); 600 601 /* 602 * Build the argument list for the signal handler. 603 */ 604 sig = bsd_to_linux_signal(sig); 605 606 bzero(&frame, sizeof(frame)); 607 608 frame.sf_handler = catcher; 609 frame.sf_sig = sig; 610 611 bsd_to_linux_sigset(mask, &lmask); 612 613 /* 614 * Build the signal context to be used by sigreturn. 615 */ 616 frame.sf_sc.sc_mask = lmask.__mask; 617 frame.sf_sc.sc_gs = rgs(); 618 frame.sf_sc.sc_fs = regs->tf_fs; 619 frame.sf_sc.sc_es = regs->tf_es; 620 frame.sf_sc.sc_ds = regs->tf_ds; 621 frame.sf_sc.sc_edi = regs->tf_edi; 622 frame.sf_sc.sc_esi = regs->tf_esi; 623 frame.sf_sc.sc_ebp = regs->tf_ebp; 624 frame.sf_sc.sc_ebx = regs->tf_ebx; 625 frame.sf_sc.sc_esp = regs->tf_esp; 626 frame.sf_sc.sc_edx = regs->tf_edx; 627 frame.sf_sc.sc_ecx = regs->tf_ecx; 628 frame.sf_sc.sc_eax = regs->tf_eax; 629 frame.sf_sc.sc_eip = regs->tf_eip; 630 frame.sf_sc.sc_cs = regs->tf_cs; 631 frame.sf_sc.sc_eflags = regs->tf_eflags; 632 frame.sf_sc.sc_esp_at_signal = regs->tf_esp; 633 frame.sf_sc.sc_ss = regs->tf_ss; 634 frame.sf_sc.sc_err = regs->tf_err; 635 frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr; 636 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno); 637 638 frame.sf_extramask[0] = lmask.__mask; 639 640 if (copyout(&frame, fp, sizeof(frame)) != 0) { 641 /* 642 * Process has trashed its stack; give it an illegal 643 * instruction to halt it in its tracks. 644 */ 645 PROC_LOCK(p); 646 sigexit(td, SIGILL); 647 } 648 649 /* 650 * Build context to run handler in. 651 */ 652 regs->tf_esp = (int)fp; 653 regs->tf_eip = linux_sigcode; 654 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 655 regs->tf_cs = _ucodesel; 656 regs->tf_ds = _udatasel; 657 regs->tf_es = _udatasel; 658 regs->tf_fs = _udatasel; 659 regs->tf_ss = _udatasel; 660 PROC_LOCK(p); 661 mtx_lock(&psp->ps_mtx); 662 } 663 664 /* 665 * System call to cleanup state after a signal 666 * has been taken. Reset signal mask and 667 * stack state from context left by sendsig (above). 668 * Return to previous pc and psl as specified by 669 * context left by sendsig. Check carefully to 670 * make sure that the user has not modified the 671 * psl to gain improper privileges or to cause 672 * a machine fault. 673 */ 674 int 675 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 676 { 677 struct l_sigframe frame; 678 struct trapframe *regs; 679 l_sigset_t lmask; 680 sigset_t bmask; 681 int eflags; 682 ksiginfo_t ksi; 683 684 regs = td->td_frame; 685 686 #ifdef DEBUG 687 if (ldebug(sigreturn)) 688 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 689 #endif 690 /* 691 * The trampoline code hands us the sigframe. 692 * It is unsafe to keep track of it ourselves, in the event that a 693 * program jumps out of a signal handler. 694 */ 695 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 696 return (EFAULT); 697 698 /* 699 * Check for security violations. 700 */ 701 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 702 eflags = frame.sf_sc.sc_eflags; 703 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 704 return (EINVAL); 705 706 /* 707 * Don't allow users to load a valid privileged %cs. Let the 708 * hardware check for invalid selectors, excess privilege in 709 * other selectors, invalid %eip's and invalid %esp's. 710 */ 711 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 712 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 713 ksiginfo_init_trap(&ksi); 714 ksi.ksi_signo = SIGBUS; 715 ksi.ksi_code = BUS_OBJERR; 716 ksi.ksi_trapno = T_PROTFLT; 717 ksi.ksi_addr = (void *)regs->tf_eip; 718 trapsignal(td, &ksi); 719 return (EINVAL); 720 } 721 722 lmask.__mask = frame.sf_sc.sc_mask; 723 linux_to_bsd_sigset(&lmask, &bmask); 724 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 725 726 /* 727 * Restore signal context. 728 */ 729 /* %gs was restored by the trampoline. */ 730 regs->tf_fs = frame.sf_sc.sc_fs; 731 regs->tf_es = frame.sf_sc.sc_es; 732 regs->tf_ds = frame.sf_sc.sc_ds; 733 regs->tf_edi = frame.sf_sc.sc_edi; 734 regs->tf_esi = frame.sf_sc.sc_esi; 735 regs->tf_ebp = frame.sf_sc.sc_ebp; 736 regs->tf_ebx = frame.sf_sc.sc_ebx; 737 regs->tf_edx = frame.sf_sc.sc_edx; 738 regs->tf_ecx = frame.sf_sc.sc_ecx; 739 regs->tf_eax = frame.sf_sc.sc_eax; 740 regs->tf_eip = frame.sf_sc.sc_eip; 741 regs->tf_cs = frame.sf_sc.sc_cs; 742 regs->tf_eflags = eflags; 743 regs->tf_esp = frame.sf_sc.sc_esp_at_signal; 744 regs->tf_ss = frame.sf_sc.sc_ss; 745 746 return (EJUSTRETURN); 747 } 748 749 /* 750 * System call to cleanup state after a signal 751 * has been taken. Reset signal mask and 752 * stack state from context left by rt_sendsig (above). 753 * Return to previous pc and psl as specified by 754 * context left by sendsig. Check carefully to 755 * make sure that the user has not modified the 756 * psl to gain improper privileges or to cause 757 * a machine fault. 758 */ 759 int 760 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 761 { 762 struct l_ucontext uc; 763 struct l_sigcontext *context; 764 sigset_t bmask; 765 l_stack_t *lss; 766 stack_t ss; 767 struct trapframe *regs; 768 int eflags; 769 ksiginfo_t ksi; 770 771 regs = td->td_frame; 772 773 #ifdef DEBUG 774 if (ldebug(rt_sigreturn)) 775 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 776 #endif 777 /* 778 * The trampoline code hands us the ucontext. 779 * It is unsafe to keep track of it ourselves, in the event that a 780 * program jumps out of a signal handler. 781 */ 782 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 783 return (EFAULT); 784 785 context = &uc.uc_mcontext; 786 787 /* 788 * Check for security violations. 789 */ 790 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 791 eflags = context->sc_eflags; 792 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 793 return (EINVAL); 794 795 /* 796 * Don't allow users to load a valid privileged %cs. Let the 797 * hardware check for invalid selectors, excess privilege in 798 * other selectors, invalid %eip's and invalid %esp's. 799 */ 800 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 801 if (!CS_SECURE(context->sc_cs)) { 802 ksiginfo_init_trap(&ksi); 803 ksi.ksi_signo = SIGBUS; 804 ksi.ksi_code = BUS_OBJERR; 805 ksi.ksi_trapno = T_PROTFLT; 806 ksi.ksi_addr = (void *)regs->tf_eip; 807 trapsignal(td, &ksi); 808 return (EINVAL); 809 } 810 811 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 812 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 813 814 /* 815 * Restore signal context 816 */ 817 /* %gs was restored by the trampoline. */ 818 regs->tf_fs = context->sc_fs; 819 regs->tf_es = context->sc_es; 820 regs->tf_ds = context->sc_ds; 821 regs->tf_edi = context->sc_edi; 822 regs->tf_esi = context->sc_esi; 823 regs->tf_ebp = context->sc_ebp; 824 regs->tf_ebx = context->sc_ebx; 825 regs->tf_edx = context->sc_edx; 826 regs->tf_ecx = context->sc_ecx; 827 regs->tf_eax = context->sc_eax; 828 regs->tf_eip = context->sc_eip; 829 regs->tf_cs = context->sc_cs; 830 regs->tf_eflags = eflags; 831 regs->tf_esp = context->sc_esp_at_signal; 832 regs->tf_ss = context->sc_ss; 833 834 /* 835 * call sigaltstack & ignore results.. 836 */ 837 lss = &uc.uc_stack; 838 ss.ss_sp = lss->ss_sp; 839 ss.ss_size = lss->ss_size; 840 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 841 842 #ifdef DEBUG 843 if (ldebug(rt_sigreturn)) 844 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 845 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 846 #endif 847 (void)kern_sigaltstack(td, &ss, NULL); 848 849 return (EJUSTRETURN); 850 } 851 852 static int 853 linux_fetch_syscall_args(struct thread *td, struct syscall_args *sa) 854 { 855 struct proc *p; 856 struct trapframe *frame; 857 858 p = td->td_proc; 859 frame = td->td_frame; 860 861 sa->code = frame->tf_eax; 862 sa->args[0] = frame->tf_ebx; 863 sa->args[1] = frame->tf_ecx; 864 sa->args[2] = frame->tf_edx; 865 sa->args[3] = frame->tf_esi; 866 sa->args[4] = frame->tf_edi; 867 sa->args[5] = frame->tf_ebp; /* Unconfirmed */ 868 869 if (sa->code >= p->p_sysent->sv_size) 870 /* nosys */ 871 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 872 else 873 sa->callp = &p->p_sysent->sv_table[sa->code]; 874 sa->narg = sa->callp->sy_narg; 875 876 td->td_retval[0] = 0; 877 td->td_retval[1] = frame->tf_edx; 878 879 return (0); 880 } 881 882 /* 883 * If a linux binary is exec'ing something, try this image activator 884 * first. We override standard shell script execution in order to 885 * be able to modify the interpreter path. We only do this if a linux 886 * binary is doing the exec, so we do not create an EXEC module for it. 887 */ 888 static int exec_linux_imgact_try(struct image_params *iparams); 889 890 static int 891 exec_linux_imgact_try(struct image_params *imgp) 892 { 893 const char *head = (const char *)imgp->image_header; 894 char *rpath; 895 int error = -1; 896 897 /* 898 * The interpreter for shell scripts run from a linux binary needs 899 * to be located in /compat/linux if possible in order to recursively 900 * maintain linux path emulation. 901 */ 902 if (((const short *)head)[0] == SHELLMAGIC) { 903 /* 904 * Run our normal shell image activator. If it succeeds attempt 905 * to use the alternate path for the interpreter. If an alternate 906 * path is found, use our stringspace to store it. 907 */ 908 if ((error = exec_shell_imgact(imgp)) == 0) { 909 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 910 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, AT_FDCWD); 911 if (rpath != NULL) 912 imgp->args->fname_buf = 913 imgp->interpreter_name = rpath; 914 } 915 } 916 return (error); 917 } 918 919 /* 920 * exec_setregs may initialize some registers differently than Linux 921 * does, thus potentially confusing Linux binaries. If necessary, we 922 * override the exec_setregs default(s) here. 923 */ 924 static void 925 exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack) 926 { 927 struct pcb *pcb = td->td_pcb; 928 929 exec_setregs(td, imgp, stack); 930 931 /* Linux sets %gs to 0, we default to _udatasel */ 932 pcb->pcb_gs = 0; 933 load_gs(0); 934 935 pcb->pcb_initial_npxcw = __LINUX_NPXCW__; 936 } 937 938 static void 939 linux_get_machine(const char **dst) 940 { 941 942 switch (cpu_class) { 943 case CPUCLASS_686: 944 *dst = "i686"; 945 break; 946 case CPUCLASS_586: 947 *dst = "i586"; 948 break; 949 case CPUCLASS_486: 950 *dst = "i486"; 951 break; 952 default: 953 *dst = "i386"; 954 } 955 } 956 957 struct sysentvec linux_sysvec = { 958 .sv_size = LINUX_SYS_MAXSYSCALL, 959 .sv_table = linux_sysent, 960 .sv_mask = 0, 961 .sv_sigsize = 0, 962 .sv_sigtbl = NULL, 963 .sv_errsize = ELAST + 1, 964 .sv_errtbl = bsd_to_linux_errno, 965 .sv_transtrap = translate_traps, 966 .sv_fixup = linux_fixup, 967 .sv_sendsig = linux_sendsig, 968 .sv_sigcode = &_binary_linux_locore_o_start, 969 .sv_szsigcode = &linux_szsigcode, 970 .sv_prepsyscall = NULL, 971 .sv_name = "Linux a.out", 972 .sv_coredump = NULL, 973 .sv_imgact_try = exec_linux_imgact_try, 974 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 975 .sv_pagesize = PAGE_SIZE, 976 .sv_minuser = VM_MIN_ADDRESS, 977 .sv_maxuser = VM_MAXUSER_ADDRESS, 978 .sv_usrstack = LINUX_USRSTACK, 979 .sv_psstrings = PS_STRINGS, 980 .sv_stackprot = VM_PROT_ALL, 981 .sv_copyout_strings = exec_copyout_strings, 982 .sv_setregs = exec_linux_setregs, 983 .sv_fixlimit = NULL, 984 .sv_maxssiz = NULL, 985 .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32, 986 .sv_set_syscall_retval = cpu_set_syscall_retval, 987 .sv_fetch_syscall_args = linux_fetch_syscall_args, 988 .sv_syscallnames = NULL, 989 .sv_shared_page_base = LINUX_SHAREDPAGE, 990 .sv_shared_page_len = PAGE_SIZE, 991 .sv_schedtail = linux_schedtail, 992 .sv_thread_detach = linux_thread_detach, 993 .sv_trap = NULL, 994 }; 995 INIT_SYSENTVEC(aout_sysvec, &linux_sysvec); 996 997 struct sysentvec elf_linux_sysvec = { 998 .sv_size = LINUX_SYS_MAXSYSCALL, 999 .sv_table = linux_sysent, 1000 .sv_mask = 0, 1001 .sv_sigsize = 0, 1002 .sv_sigtbl = NULL, 1003 .sv_errsize = ELAST + 1, 1004 .sv_errtbl = bsd_to_linux_errno, 1005 .sv_transtrap = translate_traps, 1006 .sv_fixup = elf_linux_fixup, 1007 .sv_sendsig = linux_sendsig, 1008 .sv_sigcode = &_binary_linux_locore_o_start, 1009 .sv_szsigcode = &linux_szsigcode, 1010 .sv_prepsyscall = NULL, 1011 .sv_name = "Linux ELF", 1012 .sv_coredump = elf32_coredump, 1013 .sv_imgact_try = exec_linux_imgact_try, 1014 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 1015 .sv_pagesize = PAGE_SIZE, 1016 .sv_minuser = VM_MIN_ADDRESS, 1017 .sv_maxuser = VM_MAXUSER_ADDRESS, 1018 .sv_usrstack = LINUX_USRSTACK, 1019 .sv_psstrings = LINUX_PS_STRINGS, 1020 .sv_stackprot = VM_PROT_ALL, 1021 .sv_copyout_strings = linux_copyout_strings, 1022 .sv_setregs = exec_linux_setregs, 1023 .sv_fixlimit = NULL, 1024 .sv_maxssiz = NULL, 1025 .sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP, 1026 .sv_set_syscall_retval = cpu_set_syscall_retval, 1027 .sv_fetch_syscall_args = linux_fetch_syscall_args, 1028 .sv_syscallnames = NULL, 1029 .sv_shared_page_base = LINUX_SHAREDPAGE, 1030 .sv_shared_page_len = PAGE_SIZE, 1031 .sv_schedtail = linux_schedtail, 1032 .sv_thread_detach = linux_thread_detach, 1033 .sv_trap = NULL, 1034 }; 1035 1036 static void 1037 linux_vdso_install(void *param) 1038 { 1039 1040 linux_szsigcode = (&_binary_linux_locore_o_end - 1041 &_binary_linux_locore_o_start); 1042 1043 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) 1044 panic("Linux invalid vdso size\n"); 1045 1046 __elfN(linux_vdso_fixup)(&elf_linux_sysvec); 1047 1048 linux_shared_page_obj = __elfN(linux_shared_page_init) 1049 (&linux_shared_page_mapping); 1050 1051 __elfN(linux_vdso_reloc)(&elf_linux_sysvec, LINUX_SHAREDPAGE); 1052 1053 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, 1054 linux_szsigcode); 1055 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; 1056 } 1057 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, 1058 (sysinit_cfunc_t)linux_vdso_install, NULL); 1059 1060 static void 1061 linux_vdso_deinstall(void *param) 1062 { 1063 1064 __elfN(linux_shared_page_fini)(linux_shared_page_obj); 1065 }; 1066 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 1067 (sysinit_cfunc_t)linux_vdso_deinstall, NULL); 1068 1069 static char GNU_ABI_VENDOR[] = "GNU"; 1070 static int GNULINUX_ABI_DESC = 0; 1071 1072 static boolean_t 1073 linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 1074 { 1075 const Elf32_Word *desc; 1076 uintptr_t p; 1077 1078 p = (uintptr_t)(note + 1); 1079 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1080 1081 desc = (const Elf32_Word *)p; 1082 if (desc[0] != GNULINUX_ABI_DESC) 1083 return (FALSE); 1084 1085 /* 1086 * For linux we encode osrel as follows (see linux_mib.c): 1087 * VVVMMMIII (version, major, minor), see linux_mib.c. 1088 */ 1089 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 1090 1091 return (TRUE); 1092 } 1093 1094 static Elf_Brandnote linux_brandnote = { 1095 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1096 .hdr.n_descsz = 16, /* XXX at least 16 */ 1097 .hdr.n_type = 1, 1098 .vendor = GNU_ABI_VENDOR, 1099 .flags = BN_TRANSLATE_OSREL, 1100 .trans_osrel = linux_trans_osrel 1101 }; 1102 1103 static Elf32_Brandinfo linux_brand = { 1104 .brand = ELFOSABI_LINUX, 1105 .machine = EM_386, 1106 .compat_3_brand = "Linux", 1107 .emul_path = "/compat/linux", 1108 .interp_path = "/lib/ld-linux.so.1", 1109 .sysvec = &elf_linux_sysvec, 1110 .interp_newpath = NULL, 1111 .brand_note = &linux_brandnote, 1112 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1113 }; 1114 1115 static Elf32_Brandinfo linux_glibc2brand = { 1116 .brand = ELFOSABI_LINUX, 1117 .machine = EM_386, 1118 .compat_3_brand = "Linux", 1119 .emul_path = "/compat/linux", 1120 .interp_path = "/lib/ld-linux.so.2", 1121 .sysvec = &elf_linux_sysvec, 1122 .interp_newpath = NULL, 1123 .brand_note = &linux_brandnote, 1124 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1125 }; 1126 1127 Elf32_Brandinfo *linux_brandlist[] = { 1128 &linux_brand, 1129 &linux_glibc2brand, 1130 NULL 1131 }; 1132 1133 static int 1134 linux_elf_modevent(module_t mod, int type, void *data) 1135 { 1136 Elf32_Brandinfo **brandinfo; 1137 int error; 1138 struct linux_ioctl_handler **lihp; 1139 1140 error = 0; 1141 1142 switch(type) { 1143 case MOD_LOAD: 1144 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1145 ++brandinfo) 1146 if (elf32_insert_brand_entry(*brandinfo) < 0) 1147 error = EINVAL; 1148 if (error == 0) { 1149 SET_FOREACH(lihp, linux_ioctl_handler_set) 1150 linux_ioctl_register_handler(*lihp); 1151 LIST_INIT(&futex_list); 1152 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1153 linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, linux_proc_exit, 1154 NULL, 1000); 1155 linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, linux_proc_exec, 1156 NULL, 1000); 1157 linux_thread_dtor_tag = EVENTHANDLER_REGISTER(thread_dtor, 1158 linux_thread_dtor, NULL, EVENTHANDLER_PRI_ANY); 1159 linux_get_machine(&linux_kplatform); 1160 linux_szplatform = roundup(strlen(linux_kplatform) + 1, 1161 sizeof(char *)); 1162 linux_osd_jail_register(); 1163 stclohz = (stathz ? stathz : hz); 1164 if (bootverbose) 1165 printf("Linux ELF exec handler installed\n"); 1166 } else 1167 printf("cannot insert Linux ELF brand handler\n"); 1168 break; 1169 case MOD_UNLOAD: 1170 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1171 ++brandinfo) 1172 if (elf32_brand_inuse(*brandinfo)) 1173 error = EBUSY; 1174 if (error == 0) { 1175 for (brandinfo = &linux_brandlist[0]; 1176 *brandinfo != NULL; ++brandinfo) 1177 if (elf32_remove_brand_entry(*brandinfo) < 0) 1178 error = EINVAL; 1179 } 1180 if (error == 0) { 1181 SET_FOREACH(lihp, linux_ioctl_handler_set) 1182 linux_ioctl_unregister_handler(*lihp); 1183 mtx_destroy(&futex_mtx); 1184 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag); 1185 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag); 1186 EVENTHANDLER_DEREGISTER(thread_dtor, linux_thread_dtor_tag); 1187 linux_osd_jail_deregister(); 1188 if (bootverbose) 1189 printf("Linux ELF exec handler removed\n"); 1190 } else 1191 printf("Could not deinstall ELF interpreter entry\n"); 1192 break; 1193 default: 1194 return (EOPNOTSUPP); 1195 } 1196 return (error); 1197 } 1198 1199 static moduledata_t linux_elf_mod = { 1200 "linuxelf", 1201 linux_elf_modevent, 1202 0 1203 }; 1204 1205 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1206 FEATURE(linux, "Linux 32bit support");
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