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/8.2/sys/i386/linux/linux_sysvec.c 214755 2010-11-03 21:21:12Z kib $"); 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/sysent.h> 48 #include <sys/sysproto.h> 49 #include <sys/vnode.h> 50 #include <sys/eventhandler.h> 51 52 #include <vm/vm.h> 53 #include <vm/pmap.h> 54 #include <vm/vm_extern.h> 55 #include <vm/vm_map.h> 56 #include <vm/vm_object.h> 57 #include <vm/vm_page.h> 58 #include <vm/vm_param.h> 59 60 #include <machine/cpu.h> 61 #include <machine/cputypes.h> 62 #include <machine/md_var.h> 63 #include <machine/pcb.h> 64 65 #include <i386/linux/linux.h> 66 #include <i386/linux/linux_proto.h> 67 #include <compat/linux/linux_futex.h> 68 #include <compat/linux/linux_emul.h> 69 #include <compat/linux/linux_mib.h> 70 #include <compat/linux/linux_misc.h> 71 #include <compat/linux/linux_signal.h> 72 #include <compat/linux/linux_util.h> 73 74 MODULE_VERSION(linux, 1); 75 76 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures"); 77 78 #if BYTE_ORDER == LITTLE_ENDIAN 79 #define SHELLMAGIC 0x2123 /* #! */ 80 #else 81 #define SHELLMAGIC 0x2321 82 #endif 83 84 /* 85 * Allow the sendsig functions to use the ldebug() facility 86 * even though they are not syscalls themselves. Map them 87 * to syscall 0. This is slightly less bogus than using 88 * ldebug(sigreturn). 89 */ 90 #define LINUX_SYS_linux_rt_sendsig 0 91 #define LINUX_SYS_linux_sendsig 0 92 93 extern char linux_sigcode[]; 94 extern int linux_szsigcode; 95 96 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 97 98 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 99 SET_DECLARE(linux_device_handler_set, struct linux_device_handler); 100 101 static int linux_fixup(register_t **stack_base, 102 struct image_params *iparams); 103 static int elf_linux_fixup(register_t **stack_base, 104 struct image_params *iparams); 105 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 106 static void exec_linux_setregs(struct thread *td, u_long entry, 107 u_long stack, u_long ps_strings); 108 static register_t *linux_copyout_strings(struct image_params *imgp); 109 static boolean_t linux_trans_osrel(const Elf_Note *note, int32_t *osrel); 110 111 static int linux_szplatform; 112 const char *linux_platform; 113 114 static eventhandler_tag linux_exit_tag; 115 static eventhandler_tag linux_schedtail_tag; 116 static eventhandler_tag linux_exec_tag; 117 118 /* 119 * Linux syscalls return negative errno's, we do positive and map them 120 * Reference: 121 * FreeBSD: src/sys/sys/errno.h 122 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h 123 * linux-2.6.17.8/include/asm-generic/errno.h 124 */ 125 static int bsd_to_linux_errno[ELAST + 1] = { 126 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 127 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19, 128 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, 129 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89, 130 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99, 131 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109, 132 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122, 133 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9, 134 -6, -6, -43, -42, -75,-125, -84, -95, -16, -74, 135 -72, -67, -71 136 }; 137 138 int bsd_to_linux_signal[LINUX_SIGTBLSZ] = { 139 LINUX_SIGHUP, LINUX_SIGINT, LINUX_SIGQUIT, LINUX_SIGILL, 140 LINUX_SIGTRAP, LINUX_SIGABRT, 0, LINUX_SIGFPE, 141 LINUX_SIGKILL, LINUX_SIGBUS, LINUX_SIGSEGV, LINUX_SIGSYS, 142 LINUX_SIGPIPE, LINUX_SIGALRM, LINUX_SIGTERM, LINUX_SIGURG, 143 LINUX_SIGSTOP, LINUX_SIGTSTP, LINUX_SIGCONT, LINUX_SIGCHLD, 144 LINUX_SIGTTIN, LINUX_SIGTTOU, LINUX_SIGIO, LINUX_SIGXCPU, 145 LINUX_SIGXFSZ, LINUX_SIGVTALRM, LINUX_SIGPROF, LINUX_SIGWINCH, 146 0, LINUX_SIGUSR1, LINUX_SIGUSR2 147 }; 148 149 int linux_to_bsd_signal[LINUX_SIGTBLSZ] = { 150 SIGHUP, SIGINT, SIGQUIT, SIGILL, 151 SIGTRAP, SIGABRT, SIGBUS, SIGFPE, 152 SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2, 153 SIGPIPE, SIGALRM, SIGTERM, SIGBUS, 154 SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP, 155 SIGTTIN, SIGTTOU, SIGURG, SIGXCPU, 156 SIGXFSZ, SIGVTALRM, SIGPROF, SIGWINCH, 157 SIGIO, SIGURG, SIGSYS 158 }; 159 160 #define LINUX_T_UNKNOWN 255 161 static int _bsd_to_linux_trapcode[] = { 162 LINUX_T_UNKNOWN, /* 0 */ 163 6, /* 1 T_PRIVINFLT */ 164 LINUX_T_UNKNOWN, /* 2 */ 165 3, /* 3 T_BPTFLT */ 166 LINUX_T_UNKNOWN, /* 4 */ 167 LINUX_T_UNKNOWN, /* 5 */ 168 16, /* 6 T_ARITHTRAP */ 169 254, /* 7 T_ASTFLT */ 170 LINUX_T_UNKNOWN, /* 8 */ 171 13, /* 9 T_PROTFLT */ 172 1, /* 10 T_TRCTRAP */ 173 LINUX_T_UNKNOWN, /* 11 */ 174 14, /* 12 T_PAGEFLT */ 175 LINUX_T_UNKNOWN, /* 13 */ 176 17, /* 14 T_ALIGNFLT */ 177 LINUX_T_UNKNOWN, /* 15 */ 178 LINUX_T_UNKNOWN, /* 16 */ 179 LINUX_T_UNKNOWN, /* 17 */ 180 0, /* 18 T_DIVIDE */ 181 2, /* 19 T_NMI */ 182 4, /* 20 T_OFLOW */ 183 5, /* 21 T_BOUND */ 184 7, /* 22 T_DNA */ 185 8, /* 23 T_DOUBLEFLT */ 186 9, /* 24 T_FPOPFLT */ 187 10, /* 25 T_TSSFLT */ 188 11, /* 26 T_SEGNPFLT */ 189 12, /* 27 T_STKFLT */ 190 18, /* 28 T_MCHK */ 191 19, /* 29 T_XMMFLT */ 192 15 /* 30 T_RESERVED */ 193 }; 194 #define bsd_to_linux_trapcode(code) \ 195 ((code)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \ 196 _bsd_to_linux_trapcode[(code)]: \ 197 LINUX_T_UNKNOWN) 198 199 /* 200 * If FreeBSD & Linux have a difference of opinion about what a trap 201 * means, deal with it here. 202 * 203 * MPSAFE 204 */ 205 static int 206 translate_traps(int signal, int trap_code) 207 { 208 if (signal != SIGBUS) 209 return signal; 210 switch (trap_code) { 211 case T_PROTFLT: 212 case T_TSSFLT: 213 case T_DOUBLEFLT: 214 case T_PAGEFLT: 215 return SIGSEGV; 216 default: 217 return signal; 218 } 219 } 220 221 static int 222 linux_fixup(register_t **stack_base, struct image_params *imgp) 223 { 224 register_t *argv, *envp; 225 226 argv = *stack_base; 227 envp = *stack_base + (imgp->args->argc + 1); 228 (*stack_base)--; 229 **stack_base = (intptr_t)(void *)envp; 230 (*stack_base)--; 231 **stack_base = (intptr_t)(void *)argv; 232 (*stack_base)--; 233 **stack_base = imgp->args->argc; 234 return (0); 235 } 236 237 static int 238 elf_linux_fixup(register_t **stack_base, struct image_params *imgp) 239 { 240 struct proc *p; 241 Elf32_Auxargs *args; 242 Elf32_Addr *uplatform; 243 struct ps_strings *arginfo; 244 register_t *pos; 245 246 KASSERT(curthread->td_proc == imgp->proc, 247 ("unsafe elf_linux_fixup(), should be curproc")); 248 249 p = imgp->proc; 250 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 251 uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szsigcode - 252 linux_szplatform); 253 args = (Elf32_Auxargs *)imgp->auxargs; 254 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 255 256 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, 0); 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 if (args->execfd != -1) 282 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 283 AUXARGS_ENTRY(pos, AT_NULL, 0); 284 285 free(imgp->auxargs, M_TEMP); 286 imgp->auxargs = NULL; 287 288 (*stack_base)--; 289 **stack_base = (register_t)imgp->args->argc; 290 return (0); 291 } 292 293 /* 294 * Copied from kern/kern_exec.c 295 */ 296 static register_t * 297 linux_copyout_strings(struct image_params *imgp) 298 { 299 int argc, envc; 300 char **vectp; 301 char *stringp, *destp; 302 register_t *stack_base; 303 struct ps_strings *arginfo; 304 struct proc *p; 305 306 /* 307 * Calculate string base and vector table pointers. 308 * Also deal with signal trampoline code for this exec type. 309 */ 310 p = imgp->proc; 311 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 312 destp = (caddr_t)arginfo - linux_szsigcode - SPARE_USRSPACE - 313 linux_szplatform - roundup((ARG_MAX - imgp->args->stringspace), 314 sizeof(char *)); 315 316 /* 317 * install sigcode 318 */ 319 copyout(p->p_sysent->sv_sigcode, ((caddr_t)arginfo - 320 linux_szsigcode), linux_szsigcode); 321 322 /* 323 * install LINUX_PLATFORM 324 */ 325 copyout(linux_platform, ((caddr_t)arginfo - linux_szsigcode - 326 linux_szplatform), linux_szplatform); 327 328 /* 329 * If we have a valid auxargs ptr, prepare some room 330 * on the stack. 331 */ 332 if (imgp->auxargs) { 333 /* 334 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 335 * lower compatibility. 336 */ 337 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 338 (LINUX_AT_COUNT * 2); 339 /* 340 * The '+ 2' is for the null pointers at the end of each of 341 * the arg and env vector sets,and imgp->auxarg_size is room 342 * for argument of Runtime loader. 343 */ 344 vectp = (char **)(destp - (imgp->args->argc + 345 imgp->args->envc + 2 + imgp->auxarg_size) * sizeof(char *)); 346 } else { 347 /* 348 * The '+ 2' is for the null pointers at the end of each of 349 * the arg and env vector sets 350 */ 351 vectp = (char **)(destp - (imgp->args->argc + imgp->args->envc + 2) * 352 sizeof(char *)); 353 } 354 355 /* 356 * vectp also becomes our initial stack base 357 */ 358 stack_base = (register_t *)vectp; 359 360 stringp = imgp->args->begin_argv; 361 argc = imgp->args->argc; 362 envc = imgp->args->envc; 363 364 /* 365 * Copy out strings - arguments and environment. 366 */ 367 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 368 369 /* 370 * Fill in "ps_strings" struct for ps, w, etc. 371 */ 372 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp); 373 suword(&arginfo->ps_nargvstr, argc); 374 375 /* 376 * Fill in argument portion of vector table. 377 */ 378 for (; argc > 0; --argc) { 379 suword(vectp++, (long)(intptr_t)destp); 380 while (*stringp++ != 0) 381 destp++; 382 destp++; 383 } 384 385 /* a null vector table pointer separates the argp's from the envp's */ 386 suword(vectp++, 0); 387 388 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp); 389 suword(&arginfo->ps_nenvstr, envc); 390 391 /* 392 * Fill in environment portion of vector table. 393 */ 394 for (; envc > 0; --envc) { 395 suword(vectp++, (long)(intptr_t)destp); 396 while (*stringp++ != 0) 397 destp++; 398 destp++; 399 } 400 401 /* end of vector table is a null pointer */ 402 suword(vectp, 0); 403 404 return (stack_base); 405 } 406 407 408 409 extern int _ucodesel, _udatasel; 410 extern unsigned long linux_sznonrtsigcode; 411 412 static void 413 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 414 { 415 struct thread *td = curthread; 416 struct proc *p = td->td_proc; 417 struct sigacts *psp; 418 struct trapframe *regs; 419 struct l_rt_sigframe *fp, frame; 420 int sig, code; 421 int oonstack; 422 423 sig = ksi->ksi_signo; 424 code = ksi->ksi_code; 425 PROC_LOCK_ASSERT(p, MA_OWNED); 426 psp = p->p_sigacts; 427 mtx_assert(&psp->ps_mtx, MA_OWNED); 428 regs = td->td_frame; 429 oonstack = sigonstack(regs->tf_esp); 430 431 #ifdef DEBUG 432 if (ldebug(rt_sendsig)) 433 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 434 catcher, sig, (void*)mask, code); 435 #endif 436 /* 437 * Allocate space for the signal handler context. 438 */ 439 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 440 SIGISMEMBER(psp->ps_sigonstack, sig)) { 441 fp = (struct l_rt_sigframe *)(td->td_sigstk.ss_sp + 442 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 443 } else 444 fp = (struct l_rt_sigframe *)regs->tf_esp - 1; 445 mtx_unlock(&psp->ps_mtx); 446 447 /* 448 * Build the argument list for the signal handler. 449 */ 450 if (p->p_sysent->sv_sigtbl) 451 if (sig <= p->p_sysent->sv_sigsize) 452 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 453 454 bzero(&frame, sizeof(frame)); 455 456 frame.sf_handler = catcher; 457 frame.sf_sig = sig; 458 frame.sf_siginfo = &fp->sf_si; 459 frame.sf_ucontext = &fp->sf_sc; 460 461 /* Fill in POSIX parts */ 462 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 463 464 /* 465 * Build the signal context to be used by sigreturn. 466 */ 467 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 468 frame.sf_sc.uc_link = NULL; /* XXX ??? */ 469 470 frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp; 471 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 472 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 473 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 474 PROC_UNLOCK(p); 475 476 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 477 478 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__bits[0]; 479 frame.sf_sc.uc_mcontext.sc_gs = rgs(); 480 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 481 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 482 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 483 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi; 484 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi; 485 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp; 486 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx; 487 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx; 488 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx; 489 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax; 490 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip; 491 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 492 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags; 493 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp; 494 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 495 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 496 frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; 497 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 498 499 #ifdef DEBUG 500 if (ldebug(rt_sendsig)) 501 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 502 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 503 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 504 #endif 505 506 if (copyout(&frame, fp, sizeof(frame)) != 0) { 507 /* 508 * Process has trashed its stack; give it an illegal 509 * instruction to halt it in its tracks. 510 */ 511 #ifdef DEBUG 512 if (ldebug(rt_sendsig)) 513 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 514 fp, oonstack); 515 #endif 516 PROC_LOCK(p); 517 sigexit(td, SIGILL); 518 } 519 520 /* 521 * Build context to run handler in. 522 */ 523 regs->tf_esp = (int)fp; 524 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode) + 525 linux_sznonrtsigcode; 526 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 527 regs->tf_cs = _ucodesel; 528 regs->tf_ds = _udatasel; 529 regs->tf_es = _udatasel; 530 regs->tf_fs = _udatasel; 531 regs->tf_ss = _udatasel; 532 PROC_LOCK(p); 533 mtx_lock(&psp->ps_mtx); 534 } 535 536 537 /* 538 * Send an interrupt to process. 539 * 540 * Stack is set up to allow sigcode stored 541 * in u. to call routine, followed by kcall 542 * to sigreturn routine below. After sigreturn 543 * resets the signal mask, the stack, and the 544 * frame pointer, it returns to the user 545 * specified pc, psl. 546 */ 547 static void 548 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 549 { 550 struct thread *td = curthread; 551 struct proc *p = td->td_proc; 552 struct sigacts *psp; 553 struct trapframe *regs; 554 struct l_sigframe *fp, frame; 555 l_sigset_t lmask; 556 int sig, code; 557 int oonstack, i; 558 559 PROC_LOCK_ASSERT(p, MA_OWNED); 560 psp = p->p_sigacts; 561 sig = ksi->ksi_signo; 562 code = ksi->ksi_code; 563 mtx_assert(&psp->ps_mtx, MA_OWNED); 564 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 565 /* Signal handler installed with SA_SIGINFO. */ 566 linux_rt_sendsig(catcher, ksi, mask); 567 return; 568 } 569 regs = td->td_frame; 570 oonstack = sigonstack(regs->tf_esp); 571 572 #ifdef DEBUG 573 if (ldebug(sendsig)) 574 printf(ARGS(sendsig, "%p, %d, %p, %u"), 575 catcher, sig, (void*)mask, code); 576 #endif 577 578 /* 579 * Allocate space for the signal handler context. 580 */ 581 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 582 SIGISMEMBER(psp->ps_sigonstack, sig)) { 583 fp = (struct l_sigframe *)(td->td_sigstk.ss_sp + 584 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 585 } else 586 fp = (struct l_sigframe *)regs->tf_esp - 1; 587 mtx_unlock(&psp->ps_mtx); 588 PROC_UNLOCK(p); 589 590 /* 591 * Build the argument list for the signal handler. 592 */ 593 if (p->p_sysent->sv_sigtbl) 594 if (sig <= p->p_sysent->sv_sigsize) 595 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 596 597 bzero(&frame, sizeof(frame)); 598 599 frame.sf_handler = catcher; 600 frame.sf_sig = sig; 601 602 bsd_to_linux_sigset(mask, &lmask); 603 604 /* 605 * Build the signal context to be used by sigreturn. 606 */ 607 frame.sf_sc.sc_mask = lmask.__bits[0]; 608 frame.sf_sc.sc_gs = rgs(); 609 frame.sf_sc.sc_fs = regs->tf_fs; 610 frame.sf_sc.sc_es = regs->tf_es; 611 frame.sf_sc.sc_ds = regs->tf_ds; 612 frame.sf_sc.sc_edi = regs->tf_edi; 613 frame.sf_sc.sc_esi = regs->tf_esi; 614 frame.sf_sc.sc_ebp = regs->tf_ebp; 615 frame.sf_sc.sc_ebx = regs->tf_ebx; 616 frame.sf_sc.sc_edx = regs->tf_edx; 617 frame.sf_sc.sc_ecx = regs->tf_ecx; 618 frame.sf_sc.sc_eax = regs->tf_eax; 619 frame.sf_sc.sc_eip = regs->tf_eip; 620 frame.sf_sc.sc_cs = regs->tf_cs; 621 frame.sf_sc.sc_eflags = regs->tf_eflags; 622 frame.sf_sc.sc_esp_at_signal = regs->tf_esp; 623 frame.sf_sc.sc_ss = regs->tf_ss; 624 frame.sf_sc.sc_err = regs->tf_err; 625 frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr; 626 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno); 627 628 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++) 629 frame.sf_extramask[i] = lmask.__bits[i+1]; 630 631 if (copyout(&frame, fp, sizeof(frame)) != 0) { 632 /* 633 * Process has trashed its stack; give it an illegal 634 * instruction to halt it in its tracks. 635 */ 636 PROC_LOCK(p); 637 sigexit(td, SIGILL); 638 } 639 640 /* 641 * Build context to run handler in. 642 */ 643 regs->tf_esp = (int)fp; 644 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 645 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 646 regs->tf_cs = _ucodesel; 647 regs->tf_ds = _udatasel; 648 regs->tf_es = _udatasel; 649 regs->tf_fs = _udatasel; 650 regs->tf_ss = _udatasel; 651 PROC_LOCK(p); 652 mtx_lock(&psp->ps_mtx); 653 } 654 655 /* 656 * System call to cleanup state after a signal 657 * has been taken. Reset signal mask and 658 * stack state from context left by sendsig (above). 659 * Return to previous pc and psl as specified by 660 * context left by sendsig. Check carefully to 661 * make sure that the user has not modified the 662 * psl to gain improper privileges or to cause 663 * a machine fault. 664 */ 665 int 666 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 667 { 668 struct l_sigframe frame; 669 struct trapframe *regs; 670 l_sigset_t lmask; 671 sigset_t bmask; 672 int eflags, i; 673 ksiginfo_t ksi; 674 675 regs = td->td_frame; 676 677 #ifdef DEBUG 678 if (ldebug(sigreturn)) 679 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 680 #endif 681 /* 682 * The trampoline code hands us the sigframe. 683 * It is unsafe to keep track of it ourselves, in the event that a 684 * program jumps out of a signal handler. 685 */ 686 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 687 return (EFAULT); 688 689 /* 690 * Check for security violations. 691 */ 692 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 693 eflags = frame.sf_sc.sc_eflags; 694 /* 695 * XXX do allow users to change the privileged flag PSL_RF. The 696 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 697 * sometimes set it there too. tf_eflags is kept in the signal 698 * context during signal handling and there is no other place 699 * to remember it, so the PSL_RF bit may be corrupted by the 700 * signal handler without us knowing. Corruption of the PSL_RF 701 * bit at worst causes one more or one less debugger trap, so 702 * allowing it is fairly harmless. 703 */ 704 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) 705 return(EINVAL); 706 707 /* 708 * Don't allow users to load a valid privileged %cs. Let the 709 * hardware check for invalid selectors, excess privilege in 710 * other selectors, invalid %eip's and invalid %esp's. 711 */ 712 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 713 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 714 ksiginfo_init_trap(&ksi); 715 ksi.ksi_signo = SIGBUS; 716 ksi.ksi_code = BUS_OBJERR; 717 ksi.ksi_trapno = T_PROTFLT; 718 ksi.ksi_addr = (void *)regs->tf_eip; 719 trapsignal(td, &ksi); 720 return(EINVAL); 721 } 722 723 lmask.__bits[0] = frame.sf_sc.sc_mask; 724 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++) 725 lmask.__bits[i+1] = frame.sf_extramask[i]; 726 linux_to_bsd_sigset(&lmask, &bmask); 727 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 728 729 /* 730 * Restore signal context. 731 */ 732 /* %gs was restored by the trampoline. */ 733 regs->tf_fs = frame.sf_sc.sc_fs; 734 regs->tf_es = frame.sf_sc.sc_es; 735 regs->tf_ds = frame.sf_sc.sc_ds; 736 regs->tf_edi = frame.sf_sc.sc_edi; 737 regs->tf_esi = frame.sf_sc.sc_esi; 738 regs->tf_ebp = frame.sf_sc.sc_ebp; 739 regs->tf_ebx = frame.sf_sc.sc_ebx; 740 regs->tf_edx = frame.sf_sc.sc_edx; 741 regs->tf_ecx = frame.sf_sc.sc_ecx; 742 regs->tf_eax = frame.sf_sc.sc_eax; 743 regs->tf_eip = frame.sf_sc.sc_eip; 744 regs->tf_cs = frame.sf_sc.sc_cs; 745 regs->tf_eflags = eflags; 746 regs->tf_esp = frame.sf_sc.sc_esp_at_signal; 747 regs->tf_ss = frame.sf_sc.sc_ss; 748 749 return (EJUSTRETURN); 750 } 751 752 /* 753 * System call to cleanup state after a signal 754 * has been taken. Reset signal mask and 755 * stack state from context left by rt_sendsig (above). 756 * Return to previous pc and psl as specified by 757 * context left by sendsig. Check carefully to 758 * make sure that the user has not modified the 759 * psl to gain improper privileges or to cause 760 * a machine fault. 761 */ 762 int 763 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 764 { 765 struct l_ucontext uc; 766 struct l_sigcontext *context; 767 sigset_t bmask; 768 l_stack_t *lss; 769 stack_t ss; 770 struct trapframe *regs; 771 int eflags; 772 ksiginfo_t ksi; 773 774 regs = td->td_frame; 775 776 #ifdef DEBUG 777 if (ldebug(rt_sigreturn)) 778 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 779 #endif 780 /* 781 * The trampoline code hands us the ucontext. 782 * It is unsafe to keep track of it ourselves, in the event that a 783 * program jumps out of a signal handler. 784 */ 785 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 786 return (EFAULT); 787 788 context = &uc.uc_mcontext; 789 790 /* 791 * Check for security violations. 792 */ 793 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 794 eflags = context->sc_eflags; 795 /* 796 * XXX do allow users to change the privileged flag PSL_RF. The 797 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 798 * sometimes set it there too. tf_eflags is kept in the signal 799 * context during signal handling and there is no other place 800 * to remember it, so the PSL_RF bit may be corrupted by the 801 * signal handler without us knowing. Corruption of the PSL_RF 802 * bit at worst causes one more or one less debugger trap, so 803 * allowing it is fairly harmless. 804 */ 805 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) 806 return(EINVAL); 807 808 /* 809 * Don't allow users to load a valid privileged %cs. Let the 810 * hardware check for invalid selectors, excess privilege in 811 * other selectors, invalid %eip's and invalid %esp's. 812 */ 813 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 814 if (!CS_SECURE(context->sc_cs)) { 815 ksiginfo_init_trap(&ksi); 816 ksi.ksi_signo = SIGBUS; 817 ksi.ksi_code = BUS_OBJERR; 818 ksi.ksi_trapno = T_PROTFLT; 819 ksi.ksi_addr = (void *)regs->tf_eip; 820 trapsignal(td, &ksi); 821 return(EINVAL); 822 } 823 824 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 825 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 826 827 /* 828 * Restore signal context 829 */ 830 /* %gs was restored by the trampoline. */ 831 regs->tf_fs = context->sc_fs; 832 regs->tf_es = context->sc_es; 833 regs->tf_ds = context->sc_ds; 834 regs->tf_edi = context->sc_edi; 835 regs->tf_esi = context->sc_esi; 836 regs->tf_ebp = context->sc_ebp; 837 regs->tf_ebx = context->sc_ebx; 838 regs->tf_edx = context->sc_edx; 839 regs->tf_ecx = context->sc_ecx; 840 regs->tf_eax = context->sc_eax; 841 regs->tf_eip = context->sc_eip; 842 regs->tf_cs = context->sc_cs; 843 regs->tf_eflags = eflags; 844 regs->tf_esp = context->sc_esp_at_signal; 845 regs->tf_ss = context->sc_ss; 846 847 /* 848 * call sigaltstack & ignore results.. 849 */ 850 lss = &uc.uc_stack; 851 ss.ss_sp = lss->ss_sp; 852 ss.ss_size = lss->ss_size; 853 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 854 855 #ifdef DEBUG 856 if (ldebug(rt_sigreturn)) 857 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 858 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 859 #endif 860 (void)kern_sigaltstack(td, &ss, NULL); 861 862 return (EJUSTRETURN); 863 } 864 865 static int 866 linux_fetch_syscall_args(struct thread *td, struct syscall_args *sa) 867 { 868 struct proc *p; 869 struct trapframe *frame; 870 871 p = td->td_proc; 872 frame = td->td_frame; 873 874 sa->code = frame->tf_eax; 875 sa->args[0] = frame->tf_ebx; 876 sa->args[1] = frame->tf_ecx; 877 sa->args[2] = frame->tf_edx; 878 sa->args[3] = frame->tf_esi; 879 sa->args[4] = frame->tf_edi; 880 sa->args[5] = frame->tf_ebp; /* Unconfirmed */ 881 882 if (sa->code >= p->p_sysent->sv_size) 883 sa->callp = &p->p_sysent->sv_table[0]; 884 else 885 sa->callp = &p->p_sysent->sv_table[sa->code]; 886 sa->narg = sa->callp->sy_narg; 887 888 td->td_retval[0] = 0; 889 td->td_retval[1] = frame->tf_edx; 890 891 return (0); 892 } 893 894 /* 895 * If a linux binary is exec'ing something, try this image activator 896 * first. We override standard shell script execution in order to 897 * be able to modify the interpreter path. We only do this if a linux 898 * binary is doing the exec, so we do not create an EXEC module for it. 899 */ 900 static int exec_linux_imgact_try(struct image_params *iparams); 901 902 static int 903 exec_linux_imgact_try(struct image_params *imgp) 904 { 905 const char *head = (const char *)imgp->image_header; 906 char *rpath; 907 int error = -1, len; 908 909 /* 910 * The interpreter for shell scripts run from a linux binary needs 911 * to be located in /compat/linux if possible in order to recursively 912 * maintain linux path emulation. 913 */ 914 if (((const short *)head)[0] == SHELLMAGIC) { 915 /* 916 * Run our normal shell image activator. If it succeeds attempt 917 * to use the alternate path for the interpreter. If an alternate 918 * path is found, use our stringspace to store it. 919 */ 920 if ((error = exec_shell_imgact(imgp)) == 0) { 921 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 922 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, AT_FDCWD); 923 if (rpath != NULL) { 924 len = strlen(rpath) + 1; 925 926 if (len <= MAXSHELLCMDLEN) { 927 memcpy(imgp->interpreter_name, rpath, len); 928 } 929 free(rpath, M_TEMP); 930 } 931 } 932 } 933 return(error); 934 } 935 936 /* 937 * exec_setregs may initialize some registers differently than Linux 938 * does, thus potentially confusing Linux binaries. If necessary, we 939 * override the exec_setregs default(s) here. 940 */ 941 static void 942 exec_linux_setregs(struct thread *td, u_long entry, 943 u_long stack, u_long ps_strings) 944 { 945 struct pcb *pcb = td->td_pcb; 946 947 exec_setregs(td, entry, stack, ps_strings); 948 949 /* Linux sets %gs to 0, we default to _udatasel */ 950 pcb->pcb_gs = 0; 951 load_gs(0); 952 953 pcb->pcb_initial_npxcw = __LINUX_NPXCW__; 954 } 955 956 static void 957 linux_get_machine(const char **dst) 958 { 959 960 switch (cpu_class) { 961 case CPUCLASS_686: 962 *dst = "i686"; 963 break; 964 case CPUCLASS_586: 965 *dst = "i586"; 966 break; 967 case CPUCLASS_486: 968 *dst = "i486"; 969 break; 970 default: 971 *dst = "i386"; 972 } 973 } 974 975 struct sysentvec linux_sysvec = { 976 .sv_size = LINUX_SYS_MAXSYSCALL, 977 .sv_table = linux_sysent, 978 .sv_mask = 0, 979 .sv_sigsize = LINUX_SIGTBLSZ, 980 .sv_sigtbl = bsd_to_linux_signal, 981 .sv_errsize = ELAST + 1, 982 .sv_errtbl = bsd_to_linux_errno, 983 .sv_transtrap = translate_traps, 984 .sv_fixup = linux_fixup, 985 .sv_sendsig = linux_sendsig, 986 .sv_sigcode = linux_sigcode, 987 .sv_szsigcode = &linux_szsigcode, 988 .sv_prepsyscall = NULL, 989 .sv_name = "Linux a.out", 990 .sv_coredump = NULL, 991 .sv_imgact_try = exec_linux_imgact_try, 992 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 993 .sv_pagesize = PAGE_SIZE, 994 .sv_minuser = VM_MIN_ADDRESS, 995 .sv_maxuser = VM_MAXUSER_ADDRESS, 996 .sv_usrstack = USRSTACK, 997 .sv_psstrings = PS_STRINGS, 998 .sv_stackprot = VM_PROT_ALL, 999 .sv_copyout_strings = exec_copyout_strings, 1000 .sv_setregs = exec_linux_setregs, 1001 .sv_fixlimit = NULL, 1002 .sv_maxssiz = NULL, 1003 .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32, 1004 .sv_set_syscall_retval = cpu_set_syscall_retval, 1005 .sv_fetch_syscall_args = linux_fetch_syscall_args, 1006 .sv_syscallnames = NULL, 1007 }; 1008 1009 struct sysentvec elf_linux_sysvec = { 1010 .sv_size = LINUX_SYS_MAXSYSCALL, 1011 .sv_table = linux_sysent, 1012 .sv_mask = 0, 1013 .sv_sigsize = LINUX_SIGTBLSZ, 1014 .sv_sigtbl = bsd_to_linux_signal, 1015 .sv_errsize = ELAST + 1, 1016 .sv_errtbl = bsd_to_linux_errno, 1017 .sv_transtrap = translate_traps, 1018 .sv_fixup = elf_linux_fixup, 1019 .sv_sendsig = linux_sendsig, 1020 .sv_sigcode = linux_sigcode, 1021 .sv_szsigcode = &linux_szsigcode, 1022 .sv_prepsyscall = NULL, 1023 .sv_name = "Linux ELF", 1024 .sv_coredump = elf32_coredump, 1025 .sv_imgact_try = exec_linux_imgact_try, 1026 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 1027 .sv_pagesize = PAGE_SIZE, 1028 .sv_minuser = VM_MIN_ADDRESS, 1029 .sv_maxuser = VM_MAXUSER_ADDRESS, 1030 .sv_usrstack = USRSTACK, 1031 .sv_psstrings = PS_STRINGS, 1032 .sv_stackprot = VM_PROT_ALL, 1033 .sv_copyout_strings = linux_copyout_strings, 1034 .sv_setregs = exec_linux_setregs, 1035 .sv_fixlimit = NULL, 1036 .sv_maxssiz = NULL, 1037 .sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32, 1038 .sv_set_syscall_retval = cpu_set_syscall_retval, 1039 .sv_fetch_syscall_args = linux_fetch_syscall_args, 1040 .sv_syscallnames = NULL, 1041 }; 1042 1043 static char GNU_ABI_VENDOR[] = "GNU"; 1044 static int GNULINUX_ABI_DESC = 0; 1045 1046 static boolean_t 1047 linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 1048 { 1049 const Elf32_Word *desc; 1050 uintptr_t p; 1051 1052 p = (uintptr_t)(note + 1); 1053 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1054 1055 desc = (const Elf32_Word *)p; 1056 if (desc[0] != GNULINUX_ABI_DESC) 1057 return (FALSE); 1058 1059 /* 1060 * For linux we encode osrel as follows (see linux_mib.c): 1061 * VVVMMMIII (version, major, minor), see linux_mib.c. 1062 */ 1063 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 1064 1065 return (TRUE); 1066 } 1067 1068 static Elf_Brandnote linux_brandnote = { 1069 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1070 .hdr.n_descsz = 16, /* XXX at least 16 */ 1071 .hdr.n_type = 1, 1072 .vendor = GNU_ABI_VENDOR, 1073 .flags = BN_TRANSLATE_OSREL, 1074 .trans_osrel = linux_trans_osrel 1075 }; 1076 1077 static Elf32_Brandinfo linux_brand = { 1078 .brand = ELFOSABI_LINUX, 1079 .machine = EM_386, 1080 .compat_3_brand = "Linux", 1081 .emul_path = "/compat/linux", 1082 .interp_path = "/lib/ld-linux.so.1", 1083 .sysvec = &elf_linux_sysvec, 1084 .interp_newpath = NULL, 1085 .brand_note = &linux_brandnote, 1086 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1087 }; 1088 1089 static Elf32_Brandinfo linux_glibc2brand = { 1090 .brand = ELFOSABI_LINUX, 1091 .machine = EM_386, 1092 .compat_3_brand = "Linux", 1093 .emul_path = "/compat/linux", 1094 .interp_path = "/lib/ld-linux.so.2", 1095 .sysvec = &elf_linux_sysvec, 1096 .interp_newpath = NULL, 1097 .brand_note = &linux_brandnote, 1098 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1099 }; 1100 1101 Elf32_Brandinfo *linux_brandlist[] = { 1102 &linux_brand, 1103 &linux_glibc2brand, 1104 NULL 1105 }; 1106 1107 static int 1108 linux_elf_modevent(module_t mod, int type, void *data) 1109 { 1110 Elf32_Brandinfo **brandinfo; 1111 int error; 1112 struct linux_ioctl_handler **lihp; 1113 struct linux_device_handler **ldhp; 1114 1115 error = 0; 1116 1117 switch(type) { 1118 case MOD_LOAD: 1119 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1120 ++brandinfo) 1121 if (elf32_insert_brand_entry(*brandinfo) < 0) 1122 error = EINVAL; 1123 if (error == 0) { 1124 SET_FOREACH(lihp, linux_ioctl_handler_set) 1125 linux_ioctl_register_handler(*lihp); 1126 SET_FOREACH(ldhp, linux_device_handler_set) 1127 linux_device_register_handler(*ldhp); 1128 mtx_init(&emul_lock, "emuldata lock", NULL, MTX_DEF); 1129 sx_init(&emul_shared_lock, "emuldata->shared lock"); 1130 LIST_INIT(&futex_list); 1131 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1132 linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, linux_proc_exit, 1133 NULL, 1000); 1134 linux_schedtail_tag = EVENTHANDLER_REGISTER(schedtail, linux_schedtail, 1135 NULL, 1000); 1136 linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, linux_proc_exec, 1137 NULL, 1000); 1138 linux_get_machine(&linux_platform); 1139 linux_szplatform = roundup(strlen(linux_platform) + 1, 1140 sizeof(char *)); 1141 linux_osd_jail_register(); 1142 stclohz = (stathz ? stathz : hz); 1143 if (bootverbose) 1144 printf("Linux ELF exec handler installed\n"); 1145 } else 1146 printf("cannot insert Linux ELF brand handler\n"); 1147 break; 1148 case MOD_UNLOAD: 1149 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1150 ++brandinfo) 1151 if (elf32_brand_inuse(*brandinfo)) 1152 error = EBUSY; 1153 if (error == 0) { 1154 for (brandinfo = &linux_brandlist[0]; 1155 *brandinfo != NULL; ++brandinfo) 1156 if (elf32_remove_brand_entry(*brandinfo) < 0) 1157 error = EINVAL; 1158 } 1159 if (error == 0) { 1160 SET_FOREACH(lihp, linux_ioctl_handler_set) 1161 linux_ioctl_unregister_handler(*lihp); 1162 SET_FOREACH(ldhp, linux_device_handler_set) 1163 linux_device_unregister_handler(*ldhp); 1164 mtx_destroy(&emul_lock); 1165 sx_destroy(&emul_shared_lock); 1166 mtx_destroy(&futex_mtx); 1167 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag); 1168 EVENTHANDLER_DEREGISTER(schedtail, linux_schedtail_tag); 1169 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag); 1170 linux_osd_jail_deregister(); 1171 if (bootverbose) 1172 printf("Linux ELF exec handler removed\n"); 1173 } else 1174 printf("Could not deinstall ELF interpreter entry\n"); 1175 break; 1176 default: 1177 return EOPNOTSUPP; 1178 } 1179 return error; 1180 } 1181 1182 static moduledata_t linux_elf_mod = { 1183 "linuxelf", 1184 linux_elf_modevent, 1185 0 1186 }; 1187 1188 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
Cache object: f26e18cc8bc3611cd5456aa67583f757
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