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/8.4/sys/i386/linux/linux_sysvec.c 232597 2012-03-06 10:51:53Z 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_emul.h> 68 #include <compat/linux/linux_futex.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_exec_tag; 116 117 /* 118 * Linux syscalls return negative errno's, we do positive and map them 119 * Reference: 120 * FreeBSD: src/sys/sys/errno.h 121 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h 122 * linux-2.6.17.8/include/asm-generic/errno.h 123 */ 124 static int bsd_to_linux_errno[ELAST + 1] = { 125 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 126 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19, 127 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, 128 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89, 129 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99, 130 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109, 131 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122, 132 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9, 133 -6, -6, -43, -42, -75,-125, -84, -95, -16, -74, 134 -72, -67, -71 135 }; 136 137 int bsd_to_linux_signal[LINUX_SIGTBLSZ] = { 138 LINUX_SIGHUP, LINUX_SIGINT, LINUX_SIGQUIT, LINUX_SIGILL, 139 LINUX_SIGTRAP, LINUX_SIGABRT, 0, LINUX_SIGFPE, 140 LINUX_SIGKILL, LINUX_SIGBUS, LINUX_SIGSEGV, LINUX_SIGSYS, 141 LINUX_SIGPIPE, LINUX_SIGALRM, LINUX_SIGTERM, LINUX_SIGURG, 142 LINUX_SIGSTOP, LINUX_SIGTSTP, LINUX_SIGCONT, LINUX_SIGCHLD, 143 LINUX_SIGTTIN, LINUX_SIGTTOU, LINUX_SIGIO, LINUX_SIGXCPU, 144 LINUX_SIGXFSZ, LINUX_SIGVTALRM, LINUX_SIGPROF, LINUX_SIGWINCH, 145 0, LINUX_SIGUSR1, LINUX_SIGUSR2 146 }; 147 148 int linux_to_bsd_signal[LINUX_SIGTBLSZ] = { 149 SIGHUP, SIGINT, SIGQUIT, SIGILL, 150 SIGTRAP, SIGABRT, SIGBUS, SIGFPE, 151 SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2, 152 SIGPIPE, SIGALRM, SIGTERM, SIGBUS, 153 SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP, 154 SIGTTIN, SIGTTOU, SIGURG, SIGXCPU, 155 SIGXFSZ, SIGVTALRM, SIGPROF, SIGWINCH, 156 SIGIO, SIGURG, SIGSYS 157 }; 158 159 #define LINUX_T_UNKNOWN 255 160 static int _bsd_to_linux_trapcode[] = { 161 LINUX_T_UNKNOWN, /* 0 */ 162 6, /* 1 T_PRIVINFLT */ 163 LINUX_T_UNKNOWN, /* 2 */ 164 3, /* 3 T_BPTFLT */ 165 LINUX_T_UNKNOWN, /* 4 */ 166 LINUX_T_UNKNOWN, /* 5 */ 167 16, /* 6 T_ARITHTRAP */ 168 254, /* 7 T_ASTFLT */ 169 LINUX_T_UNKNOWN, /* 8 */ 170 13, /* 9 T_PROTFLT */ 171 1, /* 10 T_TRCTRAP */ 172 LINUX_T_UNKNOWN, /* 11 */ 173 14, /* 12 T_PAGEFLT */ 174 LINUX_T_UNKNOWN, /* 13 */ 175 17, /* 14 T_ALIGNFLT */ 176 LINUX_T_UNKNOWN, /* 15 */ 177 LINUX_T_UNKNOWN, /* 16 */ 178 LINUX_T_UNKNOWN, /* 17 */ 179 0, /* 18 T_DIVIDE */ 180 2, /* 19 T_NMI */ 181 4, /* 20 T_OFLOW */ 182 5, /* 21 T_BOUND */ 183 7, /* 22 T_DNA */ 184 8, /* 23 T_DOUBLEFLT */ 185 9, /* 24 T_FPOPFLT */ 186 10, /* 25 T_TSSFLT */ 187 11, /* 26 T_SEGNPFLT */ 188 12, /* 27 T_STKFLT */ 189 18, /* 28 T_MCHK */ 190 19, /* 29 T_XMMFLT */ 191 15 /* 30 T_RESERVED */ 192 }; 193 #define bsd_to_linux_trapcode(code) \ 194 ((code)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \ 195 _bsd_to_linux_trapcode[(code)]: \ 196 LINUX_T_UNKNOWN) 197 198 /* 199 * If FreeBSD & Linux have a difference of opinion about what a trap 200 * means, deal with it here. 201 * 202 * MPSAFE 203 */ 204 static int 205 translate_traps(int signal, int trap_code) 206 { 207 if (signal != SIGBUS) 208 return signal; 209 switch (trap_code) { 210 case T_PROTFLT: 211 case T_TSSFLT: 212 case T_DOUBLEFLT: 213 case T_PAGEFLT: 214 return SIGSEGV; 215 default: 216 return signal; 217 } 218 } 219 220 static int 221 linux_fixup(register_t **stack_base, struct image_params *imgp) 222 { 223 register_t *argv, *envp; 224 225 argv = *stack_base; 226 envp = *stack_base + (imgp->args->argc + 1); 227 (*stack_base)--; 228 suword(*stack_base, (intptr_t)(void *)envp); 229 (*stack_base)--; 230 suword(*stack_base, (intptr_t)(void *)argv); 231 (*stack_base)--; 232 suword(*stack_base, imgp->args->argc); 233 return (0); 234 } 235 236 static int 237 elf_linux_fixup(register_t **stack_base, struct image_params *imgp) 238 { 239 struct proc *p; 240 Elf32_Auxargs *args; 241 Elf32_Addr *uplatform; 242 struct ps_strings *arginfo; 243 register_t *pos; 244 245 KASSERT(curthread->td_proc == imgp->proc, 246 ("unsafe elf_linux_fixup(), should be curproc")); 247 248 p = imgp->proc; 249 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 250 uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szsigcode - 251 linux_szplatform); 252 args = (Elf32_Auxargs *)imgp->auxargs; 253 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 254 255 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 256 257 /* 258 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 259 * as it has appeared in the 2.4.0-rc7 first time. 260 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 261 * glibc falls back to the hard-coded CLK_TCK value when aux entry 262 * is not present. 263 * Also see linux_times() implementation. 264 */ 265 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 266 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 267 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 268 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 269 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 270 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 271 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 272 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 273 AUXARGS_ENTRY(pos, AT_BASE, args->base); 274 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, 0); 275 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 276 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 277 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 278 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 279 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(uplatform)); 280 if (args->execfd != -1) 281 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 282 AUXARGS_ENTRY(pos, AT_NULL, 0); 283 284 free(imgp->auxargs, M_TEMP); 285 imgp->auxargs = NULL; 286 287 (*stack_base)--; 288 suword(*stack_base, (register_t)imgp->args->argc); 289 return (0); 290 } 291 292 /* 293 * Copied from kern/kern_exec.c 294 */ 295 static register_t * 296 linux_copyout_strings(struct image_params *imgp) 297 { 298 int argc, envc; 299 char **vectp; 300 char *stringp, *destp; 301 register_t *stack_base; 302 struct ps_strings *arginfo; 303 struct proc *p; 304 305 /* 306 * Calculate string base and vector table pointers. 307 * Also deal with signal trampoline code for this exec type. 308 */ 309 p = imgp->proc; 310 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 311 destp = (caddr_t)arginfo - linux_szsigcode - SPARE_USRSPACE - 312 linux_szplatform - roundup((ARG_MAX - imgp->args->stringspace), 313 sizeof(char *)); 314 315 /* 316 * install sigcode 317 */ 318 copyout(p->p_sysent->sv_sigcode, ((caddr_t)arginfo - 319 linux_szsigcode), linux_szsigcode); 320 321 /* 322 * install LINUX_PLATFORM 323 */ 324 copyout(linux_platform, ((caddr_t)arginfo - linux_szsigcode - 325 linux_szplatform), linux_szplatform); 326 327 /* 328 * If we have a valid auxargs ptr, prepare some room 329 * on the stack. 330 */ 331 if (imgp->auxargs) { 332 /* 333 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 334 * lower compatibility. 335 */ 336 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 337 (LINUX_AT_COUNT * 2); 338 /* 339 * The '+ 2' is for the null pointers at the end of each of 340 * the arg and env vector sets,and imgp->auxarg_size is room 341 * for argument of Runtime loader. 342 */ 343 vectp = (char **)(destp - (imgp->args->argc + 344 imgp->args->envc + 2 + imgp->auxarg_size) * sizeof(char *)); 345 } else { 346 /* 347 * The '+ 2' is for the null pointers at the end of each of 348 * the arg and env vector sets 349 */ 350 vectp = (char **)(destp - (imgp->args->argc + imgp->args->envc + 2) * 351 sizeof(char *)); 352 } 353 354 /* 355 * vectp also becomes our initial stack base 356 */ 357 stack_base = (register_t *)vectp; 358 359 stringp = imgp->args->begin_argv; 360 argc = imgp->args->argc; 361 envc = imgp->args->envc; 362 363 /* 364 * Copy out strings - arguments and environment. 365 */ 366 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 367 368 /* 369 * Fill in "ps_strings" struct for ps, w, etc. 370 */ 371 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp); 372 suword(&arginfo->ps_nargvstr, argc); 373 374 /* 375 * Fill in argument portion of vector table. 376 */ 377 for (; argc > 0; --argc) { 378 suword(vectp++, (long)(intptr_t)destp); 379 while (*stringp++ != 0) 380 destp++; 381 destp++; 382 } 383 384 /* a null vector table pointer separates the argp's from the envp's */ 385 suword(vectp++, 0); 386 387 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp); 388 suword(&arginfo->ps_nenvstr, envc); 389 390 /* 391 * Fill in environment portion of vector table. 392 */ 393 for (; envc > 0; --envc) { 394 suword(vectp++, (long)(intptr_t)destp); 395 while (*stringp++ != 0) 396 destp++; 397 destp++; 398 } 399 400 /* end of vector table is a null pointer */ 401 suword(vectp, 0); 402 403 return (stack_base); 404 } 405 406 407 408 extern int _ucodesel, _udatasel; 409 extern unsigned long linux_sznonrtsigcode; 410 411 static void 412 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 413 { 414 struct thread *td = curthread; 415 struct proc *p = td->td_proc; 416 struct sigacts *psp; 417 struct trapframe *regs; 418 struct l_rt_sigframe *fp, frame; 419 int sig, code; 420 int oonstack; 421 422 sig = ksi->ksi_signo; 423 code = ksi->ksi_code; 424 PROC_LOCK_ASSERT(p, MA_OWNED); 425 psp = p->p_sigacts; 426 mtx_assert(&psp->ps_mtx, MA_OWNED); 427 regs = td->td_frame; 428 oonstack = sigonstack(regs->tf_esp); 429 430 #ifdef DEBUG 431 if (ldebug(rt_sendsig)) 432 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 433 catcher, sig, (void*)mask, code); 434 #endif 435 /* 436 * Allocate space for the signal handler context. 437 */ 438 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 439 SIGISMEMBER(psp->ps_sigonstack, sig)) { 440 fp = (struct l_rt_sigframe *)(td->td_sigstk.ss_sp + 441 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 442 } else 443 fp = (struct l_rt_sigframe *)regs->tf_esp - 1; 444 mtx_unlock(&psp->ps_mtx); 445 446 /* 447 * Build the argument list for the signal handler. 448 */ 449 if (p->p_sysent->sv_sigtbl) 450 if (sig <= p->p_sysent->sv_sigsize) 451 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 452 453 bzero(&frame, sizeof(frame)); 454 455 frame.sf_handler = catcher; 456 frame.sf_sig = sig; 457 frame.sf_siginfo = &fp->sf_si; 458 frame.sf_ucontext = &fp->sf_sc; 459 460 /* Fill in POSIX parts */ 461 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 462 463 /* 464 * Build the signal context to be used by sigreturn. 465 */ 466 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 467 frame.sf_sc.uc_link = NULL; /* XXX ??? */ 468 469 frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp; 470 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 471 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 472 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 473 PROC_UNLOCK(p); 474 475 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 476 477 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__bits[0]; 478 frame.sf_sc.uc_mcontext.sc_gs = rgs(); 479 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 480 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 481 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 482 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi; 483 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi; 484 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp; 485 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx; 486 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx; 487 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx; 488 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax; 489 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip; 490 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 491 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags; 492 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp; 493 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 494 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 495 frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; 496 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 497 498 #ifdef DEBUG 499 if (ldebug(rt_sendsig)) 500 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 501 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 502 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 503 #endif 504 505 if (copyout(&frame, fp, sizeof(frame)) != 0) { 506 /* 507 * Process has trashed its stack; give it an illegal 508 * instruction to halt it in its tracks. 509 */ 510 #ifdef DEBUG 511 if (ldebug(rt_sendsig)) 512 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 513 fp, oonstack); 514 #endif 515 PROC_LOCK(p); 516 sigexit(td, SIGILL); 517 } 518 519 /* 520 * Build context to run handler in. 521 */ 522 regs->tf_esp = (int)fp; 523 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode) + 524 linux_sznonrtsigcode; 525 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 526 regs->tf_cs = _ucodesel; 527 regs->tf_ds = _udatasel; 528 regs->tf_es = _udatasel; 529 regs->tf_fs = _udatasel; 530 regs->tf_ss = _udatasel; 531 PROC_LOCK(p); 532 mtx_lock(&psp->ps_mtx); 533 } 534 535 536 /* 537 * Send an interrupt to process. 538 * 539 * Stack is set up to allow sigcode stored 540 * in u. to call routine, followed by kcall 541 * to sigreturn routine below. After sigreturn 542 * resets the signal mask, the stack, and the 543 * frame pointer, it returns to the user 544 * specified pc, psl. 545 */ 546 static void 547 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 548 { 549 struct thread *td = curthread; 550 struct proc *p = td->td_proc; 551 struct sigacts *psp; 552 struct trapframe *regs; 553 struct l_sigframe *fp, frame; 554 l_sigset_t lmask; 555 int sig, code; 556 int oonstack, i; 557 558 PROC_LOCK_ASSERT(p, MA_OWNED); 559 psp = p->p_sigacts; 560 sig = ksi->ksi_signo; 561 code = ksi->ksi_code; 562 mtx_assert(&psp->ps_mtx, MA_OWNED); 563 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 564 /* Signal handler installed with SA_SIGINFO. */ 565 linux_rt_sendsig(catcher, ksi, mask); 566 return; 567 } 568 regs = td->td_frame; 569 oonstack = sigonstack(regs->tf_esp); 570 571 #ifdef DEBUG 572 if (ldebug(sendsig)) 573 printf(ARGS(sendsig, "%p, %d, %p, %u"), 574 catcher, sig, (void*)mask, code); 575 #endif 576 577 /* 578 * Allocate space for the signal handler context. 579 */ 580 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 581 SIGISMEMBER(psp->ps_sigonstack, sig)) { 582 fp = (struct l_sigframe *)(td->td_sigstk.ss_sp + 583 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 584 } else 585 fp = (struct l_sigframe *)regs->tf_esp - 1; 586 mtx_unlock(&psp->ps_mtx); 587 PROC_UNLOCK(p); 588 589 /* 590 * Build the argument list for the signal handler. 591 */ 592 if (p->p_sysent->sv_sigtbl) 593 if (sig <= p->p_sysent->sv_sigsize) 594 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 595 596 bzero(&frame, sizeof(frame)); 597 598 frame.sf_handler = catcher; 599 frame.sf_sig = sig; 600 601 bsd_to_linux_sigset(mask, &lmask); 602 603 /* 604 * Build the signal context to be used by sigreturn. 605 */ 606 frame.sf_sc.sc_mask = lmask.__bits[0]; 607 frame.sf_sc.sc_gs = rgs(); 608 frame.sf_sc.sc_fs = regs->tf_fs; 609 frame.sf_sc.sc_es = regs->tf_es; 610 frame.sf_sc.sc_ds = regs->tf_ds; 611 frame.sf_sc.sc_edi = regs->tf_edi; 612 frame.sf_sc.sc_esi = regs->tf_esi; 613 frame.sf_sc.sc_ebp = regs->tf_ebp; 614 frame.sf_sc.sc_ebx = regs->tf_ebx; 615 frame.sf_sc.sc_edx = regs->tf_edx; 616 frame.sf_sc.sc_ecx = regs->tf_ecx; 617 frame.sf_sc.sc_eax = regs->tf_eax; 618 frame.sf_sc.sc_eip = regs->tf_eip; 619 frame.sf_sc.sc_cs = regs->tf_cs; 620 frame.sf_sc.sc_eflags = regs->tf_eflags; 621 frame.sf_sc.sc_esp_at_signal = regs->tf_esp; 622 frame.sf_sc.sc_ss = regs->tf_ss; 623 frame.sf_sc.sc_err = regs->tf_err; 624 frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr; 625 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno); 626 627 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++) 628 frame.sf_extramask[i] = lmask.__bits[i+1]; 629 630 if (copyout(&frame, fp, sizeof(frame)) != 0) { 631 /* 632 * Process has trashed its stack; give it an illegal 633 * instruction to halt it in its tracks. 634 */ 635 PROC_LOCK(p); 636 sigexit(td, SIGILL); 637 } 638 639 /* 640 * Build context to run handler in. 641 */ 642 regs->tf_esp = (int)fp; 643 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 644 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 645 regs->tf_cs = _ucodesel; 646 regs->tf_ds = _udatasel; 647 regs->tf_es = _udatasel; 648 regs->tf_fs = _udatasel; 649 regs->tf_ss = _udatasel; 650 PROC_LOCK(p); 651 mtx_lock(&psp->ps_mtx); 652 } 653 654 /* 655 * System call to cleanup state after a signal 656 * has been taken. Reset signal mask and 657 * stack state from context left by sendsig (above). 658 * Return to previous pc and psl as specified by 659 * context left by sendsig. Check carefully to 660 * make sure that the user has not modified the 661 * psl to gain improper privileges or to cause 662 * a machine fault. 663 */ 664 int 665 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 666 { 667 struct l_sigframe frame; 668 struct trapframe *regs; 669 l_sigset_t lmask; 670 sigset_t bmask; 671 int eflags, i; 672 ksiginfo_t ksi; 673 674 regs = td->td_frame; 675 676 #ifdef DEBUG 677 if (ldebug(sigreturn)) 678 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 679 #endif 680 /* 681 * The trampoline code hands us the sigframe. 682 * It is unsafe to keep track of it ourselves, in the event that a 683 * program jumps out of a signal handler. 684 */ 685 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 686 return (EFAULT); 687 688 /* 689 * Check for security violations. 690 */ 691 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 692 eflags = frame.sf_sc.sc_eflags; 693 /* 694 * XXX do allow users to change the privileged flag PSL_RF. The 695 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 696 * sometimes set it there too. tf_eflags is kept in the signal 697 * context during signal handling and there is no other place 698 * to remember it, so the PSL_RF bit may be corrupted by the 699 * signal handler without us knowing. Corruption of the PSL_RF 700 * bit at worst causes one more or one less debugger trap, so 701 * allowing it is fairly harmless. 702 */ 703 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) 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.__bits[0] = frame.sf_sc.sc_mask; 723 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++) 724 lmask.__bits[i+1] = frame.sf_extramask[i]; 725 linux_to_bsd_sigset(&lmask, &bmask); 726 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 727 728 /* 729 * Restore signal context. 730 */ 731 /* %gs was restored by the trampoline. */ 732 regs->tf_fs = frame.sf_sc.sc_fs; 733 regs->tf_es = frame.sf_sc.sc_es; 734 regs->tf_ds = frame.sf_sc.sc_ds; 735 regs->tf_edi = frame.sf_sc.sc_edi; 736 regs->tf_esi = frame.sf_sc.sc_esi; 737 regs->tf_ebp = frame.sf_sc.sc_ebp; 738 regs->tf_ebx = frame.sf_sc.sc_ebx; 739 regs->tf_edx = frame.sf_sc.sc_edx; 740 regs->tf_ecx = frame.sf_sc.sc_ecx; 741 regs->tf_eax = frame.sf_sc.sc_eax; 742 regs->tf_eip = frame.sf_sc.sc_eip; 743 regs->tf_cs = frame.sf_sc.sc_cs; 744 regs->tf_eflags = eflags; 745 regs->tf_esp = frame.sf_sc.sc_esp_at_signal; 746 regs->tf_ss = frame.sf_sc.sc_ss; 747 748 return (EJUSTRETURN); 749 } 750 751 /* 752 * System call to cleanup state after a signal 753 * has been taken. Reset signal mask and 754 * stack state from context left by rt_sendsig (above). 755 * Return to previous pc and psl as specified by 756 * context left by sendsig. Check carefully to 757 * make sure that the user has not modified the 758 * psl to gain improper privileges or to cause 759 * a machine fault. 760 */ 761 int 762 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 763 { 764 struct l_ucontext uc; 765 struct l_sigcontext *context; 766 sigset_t bmask; 767 l_stack_t *lss; 768 stack_t ss; 769 struct trapframe *regs; 770 int eflags; 771 ksiginfo_t ksi; 772 773 regs = td->td_frame; 774 775 #ifdef DEBUG 776 if (ldebug(rt_sigreturn)) 777 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 778 #endif 779 /* 780 * The trampoline code hands us the ucontext. 781 * It is unsafe to keep track of it ourselves, in the event that a 782 * program jumps out of a signal handler. 783 */ 784 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 785 return (EFAULT); 786 787 context = &uc.uc_mcontext; 788 789 /* 790 * Check for security violations. 791 */ 792 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 793 eflags = context->sc_eflags; 794 /* 795 * XXX do allow users to change the privileged flag PSL_RF. The 796 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 797 * sometimes set it there too. tf_eflags is kept in the signal 798 * context during signal handling and there is no other place 799 * to remember it, so the PSL_RF bit may be corrupted by the 800 * signal handler without us knowing. Corruption of the PSL_RF 801 * bit at worst causes one more or one less debugger trap, so 802 * allowing it is fairly harmless. 803 */ 804 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) 805 return(EINVAL); 806 807 /* 808 * Don't allow users to load a valid privileged %cs. Let the 809 * hardware check for invalid selectors, excess privilege in 810 * other selectors, invalid %eip's and invalid %esp's. 811 */ 812 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 813 if (!CS_SECURE(context->sc_cs)) { 814 ksiginfo_init_trap(&ksi); 815 ksi.ksi_signo = SIGBUS; 816 ksi.ksi_code = BUS_OBJERR; 817 ksi.ksi_trapno = T_PROTFLT; 818 ksi.ksi_addr = (void *)regs->tf_eip; 819 trapsignal(td, &ksi); 820 return(EINVAL); 821 } 822 823 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 824 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 825 826 /* 827 * Restore signal context 828 */ 829 /* %gs was restored by the trampoline. */ 830 regs->tf_fs = context->sc_fs; 831 regs->tf_es = context->sc_es; 832 regs->tf_ds = context->sc_ds; 833 regs->tf_edi = context->sc_edi; 834 regs->tf_esi = context->sc_esi; 835 regs->tf_ebp = context->sc_ebp; 836 regs->tf_ebx = context->sc_ebx; 837 regs->tf_edx = context->sc_edx; 838 regs->tf_ecx = context->sc_ecx; 839 regs->tf_eax = context->sc_eax; 840 regs->tf_eip = context->sc_eip; 841 regs->tf_cs = context->sc_cs; 842 regs->tf_eflags = eflags; 843 regs->tf_esp = context->sc_esp_at_signal; 844 regs->tf_ss = context->sc_ss; 845 846 /* 847 * call sigaltstack & ignore results.. 848 */ 849 lss = &uc.uc_stack; 850 ss.ss_sp = lss->ss_sp; 851 ss.ss_size = lss->ss_size; 852 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 853 854 #ifdef DEBUG 855 if (ldebug(rt_sigreturn)) 856 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 857 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 858 #endif 859 (void)kern_sigaltstack(td, &ss, NULL); 860 861 return (EJUSTRETURN); 862 } 863 864 static int 865 linux_fetch_syscall_args(struct thread *td, struct syscall_args *sa) 866 { 867 struct proc *p; 868 struct trapframe *frame; 869 870 p = td->td_proc; 871 frame = td->td_frame; 872 873 sa->code = frame->tf_eax; 874 sa->args[0] = frame->tf_ebx; 875 sa->args[1] = frame->tf_ecx; 876 sa->args[2] = frame->tf_edx; 877 sa->args[3] = frame->tf_esi; 878 sa->args[4] = frame->tf_edi; 879 sa->args[5] = frame->tf_ebp; /* Unconfirmed */ 880 881 if (sa->code >= p->p_sysent->sv_size) 882 sa->callp = &p->p_sysent->sv_table[0]; 883 else 884 sa->callp = &p->p_sysent->sv_table[sa->code]; 885 sa->narg = sa->callp->sy_narg; 886 887 td->td_retval[0] = 0; 888 td->td_retval[1] = frame->tf_edx; 889 890 return (0); 891 } 892 893 /* 894 * If a linux binary is exec'ing something, try this image activator 895 * first. We override standard shell script execution in order to 896 * be able to modify the interpreter path. We only do this if a linux 897 * binary is doing the exec, so we do not create an EXEC module for it. 898 */ 899 static int exec_linux_imgact_try(struct image_params *iparams); 900 901 static int 902 exec_linux_imgact_try(struct image_params *imgp) 903 { 904 const char *head = (const char *)imgp->image_header; 905 char *rpath; 906 int error = -1, len; 907 908 /* 909 * The interpreter for shell scripts run from a linux binary needs 910 * to be located in /compat/linux if possible in order to recursively 911 * maintain linux path emulation. 912 */ 913 if (((const short *)head)[0] == SHELLMAGIC) { 914 /* 915 * Run our normal shell image activator. If it succeeds attempt 916 * to use the alternate path for the interpreter. If an alternate 917 * path is found, use our stringspace to store it. 918 */ 919 if ((error = exec_shell_imgact(imgp)) == 0) { 920 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 921 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, AT_FDCWD); 922 if (rpath != NULL) { 923 len = strlen(rpath) + 1; 924 925 if (len <= MAXSHELLCMDLEN) { 926 memcpy(imgp->interpreter_name, rpath, len); 927 } 928 free(rpath, M_TEMP); 929 } 930 } 931 } 932 return(error); 933 } 934 935 /* 936 * exec_setregs may initialize some registers differently than Linux 937 * does, thus potentially confusing Linux binaries. If necessary, we 938 * override the exec_setregs default(s) here. 939 */ 940 static void 941 exec_linux_setregs(struct thread *td, u_long entry, 942 u_long stack, u_long ps_strings) 943 { 944 struct pcb *pcb = td->td_pcb; 945 946 exec_setregs(td, entry, stack, ps_strings); 947 948 /* Linux sets %gs to 0, we default to _udatasel */ 949 pcb->pcb_gs = 0; 950 load_gs(0); 951 952 pcb->pcb_initial_npxcw = __LINUX_NPXCW__; 953 } 954 955 static void 956 linux_get_machine(const char **dst) 957 { 958 959 switch (cpu_class) { 960 case CPUCLASS_686: 961 *dst = "i686"; 962 break; 963 case CPUCLASS_586: 964 *dst = "i586"; 965 break; 966 case CPUCLASS_486: 967 *dst = "i486"; 968 break; 969 default: 970 *dst = "i386"; 971 } 972 } 973 974 struct sysentvec linux_sysvec = { 975 .sv_size = LINUX_SYS_MAXSYSCALL, 976 .sv_table = linux_sysent, 977 .sv_mask = 0, 978 .sv_sigsize = LINUX_SIGTBLSZ, 979 .sv_sigtbl = bsd_to_linux_signal, 980 .sv_errsize = ELAST + 1, 981 .sv_errtbl = bsd_to_linux_errno, 982 .sv_transtrap = translate_traps, 983 .sv_fixup = linux_fixup, 984 .sv_sendsig = linux_sendsig, 985 .sv_sigcode = linux_sigcode, 986 .sv_szsigcode = &linux_szsigcode, 987 .sv_prepsyscall = NULL, 988 .sv_name = "Linux a.out", 989 .sv_coredump = NULL, 990 .sv_imgact_try = exec_linux_imgact_try, 991 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 992 .sv_pagesize = PAGE_SIZE, 993 .sv_minuser = VM_MIN_ADDRESS, 994 .sv_maxuser = VM_MAXUSER_ADDRESS, 995 .sv_usrstack = USRSTACK, 996 .sv_psstrings = PS_STRINGS, 997 .sv_stackprot = VM_PROT_ALL, 998 .sv_copyout_strings = exec_copyout_strings, 999 .sv_setregs = exec_linux_setregs, 1000 .sv_fixlimit = NULL, 1001 .sv_maxssiz = NULL, 1002 .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32, 1003 .sv_set_syscall_retval = cpu_set_syscall_retval, 1004 .sv_fetch_syscall_args = linux_fetch_syscall_args, 1005 .sv_syscallnames = NULL, 1006 .sv_schedtail = linux_schedtail, 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 .sv_schedtail = linux_schedtail, 1042 }; 1043 1044 static char GNU_ABI_VENDOR[] = "GNU"; 1045 static int GNULINUX_ABI_DESC = 0; 1046 1047 static boolean_t 1048 linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 1049 { 1050 const Elf32_Word *desc; 1051 uintptr_t p; 1052 1053 p = (uintptr_t)(note + 1); 1054 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1055 1056 desc = (const Elf32_Word *)p; 1057 if (desc[0] != GNULINUX_ABI_DESC) 1058 return (FALSE); 1059 1060 /* 1061 * For linux we encode osrel as follows (see linux_mib.c): 1062 * VVVMMMIII (version, major, minor), see linux_mib.c. 1063 */ 1064 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 1065 1066 return (TRUE); 1067 } 1068 1069 static Elf_Brandnote linux_brandnote = { 1070 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1071 .hdr.n_descsz = 16, /* XXX at least 16 */ 1072 .hdr.n_type = 1, 1073 .vendor = GNU_ABI_VENDOR, 1074 .flags = BN_TRANSLATE_OSREL, 1075 .trans_osrel = linux_trans_osrel 1076 }; 1077 1078 static Elf32_Brandinfo linux_brand = { 1079 .brand = ELFOSABI_LINUX, 1080 .machine = EM_386, 1081 .compat_3_brand = "Linux", 1082 .emul_path = "/compat/linux", 1083 .interp_path = "/lib/ld-linux.so.1", 1084 .sysvec = &elf_linux_sysvec, 1085 .interp_newpath = NULL, 1086 .brand_note = &linux_brandnote, 1087 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1088 }; 1089 1090 static Elf32_Brandinfo linux_glibc2brand = { 1091 .brand = ELFOSABI_LINUX, 1092 .machine = EM_386, 1093 .compat_3_brand = "Linux", 1094 .emul_path = "/compat/linux", 1095 .interp_path = "/lib/ld-linux.so.2", 1096 .sysvec = &elf_linux_sysvec, 1097 .interp_newpath = NULL, 1098 .brand_note = &linux_brandnote, 1099 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1100 }; 1101 1102 Elf32_Brandinfo *linux_brandlist[] = { 1103 &linux_brand, 1104 &linux_glibc2brand, 1105 NULL 1106 }; 1107 1108 static int 1109 linux_elf_modevent(module_t mod, int type, void *data) 1110 { 1111 Elf32_Brandinfo **brandinfo; 1112 int error; 1113 struct linux_ioctl_handler **lihp; 1114 struct linux_device_handler **ldhp; 1115 1116 error = 0; 1117 1118 switch(type) { 1119 case MOD_LOAD: 1120 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1121 ++brandinfo) 1122 if (elf32_insert_brand_entry(*brandinfo) < 0) 1123 error = EINVAL; 1124 if (error == 0) { 1125 SET_FOREACH(lihp, linux_ioctl_handler_set) 1126 linux_ioctl_register_handler(*lihp); 1127 SET_FOREACH(ldhp, linux_device_handler_set) 1128 linux_device_register_handler(*ldhp); 1129 mtx_init(&emul_lock, "emuldata lock", NULL, MTX_DEF); 1130 sx_init(&emul_shared_lock, "emuldata->shared lock"); 1131 LIST_INIT(&futex_list); 1132 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1133 linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, linux_proc_exit, 1134 NULL, 1000); 1135 linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, linux_proc_exec, 1136 NULL, 1000); 1137 linux_get_machine(&linux_platform); 1138 linux_szplatform = roundup(strlen(linux_platform) + 1, 1139 sizeof(char *)); 1140 linux_osd_jail_register(); 1141 stclohz = (stathz ? stathz : hz); 1142 if (bootverbose) 1143 printf("Linux ELF exec handler installed\n"); 1144 } else 1145 printf("cannot insert Linux ELF brand handler\n"); 1146 break; 1147 case MOD_UNLOAD: 1148 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1149 ++brandinfo) 1150 if (elf32_brand_inuse(*brandinfo)) 1151 error = EBUSY; 1152 if (error == 0) { 1153 for (brandinfo = &linux_brandlist[0]; 1154 *brandinfo != NULL; ++brandinfo) 1155 if (elf32_remove_brand_entry(*brandinfo) < 0) 1156 error = EINVAL; 1157 } 1158 if (error == 0) { 1159 SET_FOREACH(lihp, linux_ioctl_handler_set) 1160 linux_ioctl_unregister_handler(*lihp); 1161 SET_FOREACH(ldhp, linux_device_handler_set) 1162 linux_device_unregister_handler(*ldhp); 1163 mtx_destroy(&emul_lock); 1164 sx_destroy(&emul_shared_lock); 1165 mtx_destroy(&futex_mtx); 1166 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag); 1167 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag); 1168 linux_osd_jail_deregister(); 1169 if (bootverbose) 1170 printf("Linux ELF exec handler removed\n"); 1171 } else 1172 printf("Could not deinstall ELF interpreter entry\n"); 1173 break; 1174 default: 1175 return EOPNOTSUPP; 1176 } 1177 return error; 1178 } 1179 1180 static moduledata_t linux_elf_mod = { 1181 "linuxelf", 1182 linux_elf_modevent, 1183 0 1184 }; 1185 1186 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
Cache object: ef2659e01b13c426ef79b375b56c3611
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