Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/amd64/linux32/linux32_sysvec.c
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1 /*- 2 * Copyright (c) 2004 Tim J. Robbins 3 * Copyright (c) 2003 Peter Wemm 4 * Copyright (c) 2002 Doug Rabson 5 * Copyright (c) 1998-1999 Andrew Gallatin 6 * Copyright (c) 1994-1996 Søren Schmidt 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer 14 * in this position and unchanged. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD: releng/8.2/sys/amd64/linux32/linux32_sysvec.c 216458 2010-12-15 15:25:56Z kib $"); 35 #include "opt_compat.h" 36 37 #ifndef COMPAT_FREEBSD32 38 #error "Unable to compile Linux-emulator due to missing COMPAT_FREEBSD32 option!" 39 #endif 40 41 #define __ELF_WORD_SIZE 32 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/exec.h> 46 #include <sys/fcntl.h> 47 #include <sys/imgact.h> 48 #include <sys/imgact_elf.h> 49 #include <sys/kernel.h> 50 #include <sys/lock.h> 51 #include <sys/malloc.h> 52 #include <sys/module.h> 53 #include <sys/mutex.h> 54 #include <sys/proc.h> 55 #include <sys/resourcevar.h> 56 #include <sys/signalvar.h> 57 #include <sys/sysctl.h> 58 #include <sys/syscallsubr.h> 59 #include <sys/sysent.h> 60 #include <sys/sysproto.h> 61 #include <sys/vnode.h> 62 #include <sys/eventhandler.h> 63 64 #include <vm/vm.h> 65 #include <vm/pmap.h> 66 #include <vm/vm_extern.h> 67 #include <vm/vm_map.h> 68 #include <vm/vm_object.h> 69 #include <vm/vm_page.h> 70 #include <vm/vm_param.h> 71 72 #include <machine/cpu.h> 73 #include <machine/md_var.h> 74 #include <machine/pcb.h> 75 #include <machine/specialreg.h> 76 77 #include <amd64/linux32/linux.h> 78 #include <amd64/linux32/linux32_proto.h> 79 #include <compat/linux/linux_futex.h> 80 #include <compat/linux/linux_emul.h> 81 #include <compat/linux/linux_mib.h> 82 #include <compat/linux/linux_misc.h> 83 #include <compat/linux/linux_signal.h> 84 #include <compat/linux/linux_util.h> 85 86 MODULE_VERSION(linux, 1); 87 88 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures"); 89 90 #define AUXARGS_ENTRY_32(pos, id, val) \ 91 do { \ 92 suword32(pos++, id); \ 93 suword32(pos++, val); \ 94 } while (0) 95 96 #if BYTE_ORDER == LITTLE_ENDIAN 97 #define SHELLMAGIC 0x2123 /* #! */ 98 #else 99 #define SHELLMAGIC 0x2321 100 #endif 101 102 /* 103 * Allow the sendsig functions to use the ldebug() facility 104 * even though they are not syscalls themselves. Map them 105 * to syscall 0. This is slightly less bogus than using 106 * ldebug(sigreturn). 107 */ 108 #define LINUX_SYS_linux_rt_sendsig 0 109 #define LINUX_SYS_linux_sendsig 0 110 111 const char *linux_platform = "i686"; 112 static int linux_szplatform; 113 extern char linux_sigcode[]; 114 extern int linux_szsigcode; 115 116 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 117 118 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 119 SET_DECLARE(linux_device_handler_set, struct linux_device_handler); 120 121 static int elf_linux_fixup(register_t **stack_base, 122 struct image_params *iparams); 123 static register_t *linux_copyout_strings(struct image_params *imgp); 124 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 125 static void exec_linux_setregs(struct thread *td, u_long entry, 126 u_long stack, u_long ps_strings); 127 static void linux32_fixlimit(struct rlimit *rl, int which); 128 static boolean_t linux32_trans_osrel(const Elf_Note *note, int32_t *osrel); 129 130 static eventhandler_tag linux_exit_tag; 131 static eventhandler_tag linux_schedtail_tag; 132 static eventhandler_tag linux_exec_tag; 133 134 /* 135 * Linux syscalls return negative errno's, we do positive and map them 136 * Reference: 137 * FreeBSD: src/sys/sys/errno.h 138 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h 139 * linux-2.6.17.8/include/asm-generic/errno.h 140 */ 141 static int bsd_to_linux_errno[ELAST + 1] = { 142 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 143 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19, 144 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, 145 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89, 146 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99, 147 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109, 148 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122, 149 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9, 150 -6, -6, -43, -42, -75,-125, -84, -95, -16, -74, 151 -72, -67, -71 152 }; 153 154 int bsd_to_linux_signal[LINUX_SIGTBLSZ] = { 155 LINUX_SIGHUP, LINUX_SIGINT, LINUX_SIGQUIT, LINUX_SIGILL, 156 LINUX_SIGTRAP, LINUX_SIGABRT, 0, LINUX_SIGFPE, 157 LINUX_SIGKILL, LINUX_SIGBUS, LINUX_SIGSEGV, LINUX_SIGSYS, 158 LINUX_SIGPIPE, LINUX_SIGALRM, LINUX_SIGTERM, LINUX_SIGURG, 159 LINUX_SIGSTOP, LINUX_SIGTSTP, LINUX_SIGCONT, LINUX_SIGCHLD, 160 LINUX_SIGTTIN, LINUX_SIGTTOU, LINUX_SIGIO, LINUX_SIGXCPU, 161 LINUX_SIGXFSZ, LINUX_SIGVTALRM, LINUX_SIGPROF, LINUX_SIGWINCH, 162 0, LINUX_SIGUSR1, LINUX_SIGUSR2 163 }; 164 165 int linux_to_bsd_signal[LINUX_SIGTBLSZ] = { 166 SIGHUP, SIGINT, SIGQUIT, SIGILL, 167 SIGTRAP, SIGABRT, SIGBUS, SIGFPE, 168 SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2, 169 SIGPIPE, SIGALRM, SIGTERM, SIGBUS, 170 SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP, 171 SIGTTIN, SIGTTOU, SIGURG, SIGXCPU, 172 SIGXFSZ, SIGVTALRM, SIGPROF, SIGWINCH, 173 SIGIO, SIGURG, SIGSYS 174 }; 175 176 #define LINUX_T_UNKNOWN 255 177 static int _bsd_to_linux_trapcode[] = { 178 LINUX_T_UNKNOWN, /* 0 */ 179 6, /* 1 T_PRIVINFLT */ 180 LINUX_T_UNKNOWN, /* 2 */ 181 3, /* 3 T_BPTFLT */ 182 LINUX_T_UNKNOWN, /* 4 */ 183 LINUX_T_UNKNOWN, /* 5 */ 184 16, /* 6 T_ARITHTRAP */ 185 254, /* 7 T_ASTFLT */ 186 LINUX_T_UNKNOWN, /* 8 */ 187 13, /* 9 T_PROTFLT */ 188 1, /* 10 T_TRCTRAP */ 189 LINUX_T_UNKNOWN, /* 11 */ 190 14, /* 12 T_PAGEFLT */ 191 LINUX_T_UNKNOWN, /* 13 */ 192 17, /* 14 T_ALIGNFLT */ 193 LINUX_T_UNKNOWN, /* 15 */ 194 LINUX_T_UNKNOWN, /* 16 */ 195 LINUX_T_UNKNOWN, /* 17 */ 196 0, /* 18 T_DIVIDE */ 197 2, /* 19 T_NMI */ 198 4, /* 20 T_OFLOW */ 199 5, /* 21 T_BOUND */ 200 7, /* 22 T_DNA */ 201 8, /* 23 T_DOUBLEFLT */ 202 9, /* 24 T_FPOPFLT */ 203 10, /* 25 T_TSSFLT */ 204 11, /* 26 T_SEGNPFLT */ 205 12, /* 27 T_STKFLT */ 206 18, /* 28 T_MCHK */ 207 19, /* 29 T_XMMFLT */ 208 15 /* 30 T_RESERVED */ 209 }; 210 #define bsd_to_linux_trapcode(code) \ 211 ((code)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \ 212 _bsd_to_linux_trapcode[(code)]: \ 213 LINUX_T_UNKNOWN) 214 215 struct linux32_ps_strings { 216 u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 217 u_int ps_nargvstr; /* the number of argument strings */ 218 u_int32_t ps_envstr; /* first of 0 or more environment strings */ 219 u_int ps_nenvstr; /* the number of environment strings */ 220 }; 221 222 /* 223 * If FreeBSD & Linux have a difference of opinion about what a trap 224 * means, deal with it here. 225 * 226 * MPSAFE 227 */ 228 static int 229 translate_traps(int signal, int trap_code) 230 { 231 if (signal != SIGBUS) 232 return signal; 233 switch (trap_code) { 234 case T_PROTFLT: 235 case T_TSSFLT: 236 case T_DOUBLEFLT: 237 case T_PAGEFLT: 238 return SIGSEGV; 239 default: 240 return signal; 241 } 242 } 243 244 static int 245 elf_linux_fixup(register_t **stack_base, struct image_params *imgp) 246 { 247 Elf32_Auxargs *args; 248 Elf32_Addr *base; 249 Elf32_Addr *pos, *uplatform; 250 struct linux32_ps_strings *arginfo; 251 252 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 253 uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szsigcode - 254 linux_szplatform); 255 256 KASSERT(curthread->td_proc == imgp->proc, 257 ("unsafe elf_linux_fixup(), should be curproc")); 258 base = (Elf32_Addr *)*stack_base; 259 args = (Elf32_Auxargs *)imgp->auxargs; 260 pos = base + (imgp->args->argc + imgp->args->envc + 2); 261 262 AUXARGS_ENTRY_32(pos, LINUX_AT_HWCAP, cpu_feature); 263 264 /* 265 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 266 * as it has appeared in the 2.4.0-rc7 first time. 267 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 268 * glibc falls back to the hard-coded CLK_TCK value when aux entry 269 * is not present. 270 * Also see linux_times() implementation. 271 */ 272 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 273 AUXARGS_ENTRY_32(pos, LINUX_AT_CLKTCK, stclohz); 274 AUXARGS_ENTRY_32(pos, AT_PHDR, args->phdr); 275 AUXARGS_ENTRY_32(pos, AT_PHENT, args->phent); 276 AUXARGS_ENTRY_32(pos, AT_PHNUM, args->phnum); 277 AUXARGS_ENTRY_32(pos, AT_PAGESZ, args->pagesz); 278 AUXARGS_ENTRY_32(pos, AT_FLAGS, args->flags); 279 AUXARGS_ENTRY_32(pos, AT_ENTRY, args->entry); 280 AUXARGS_ENTRY_32(pos, AT_BASE, args->base); 281 AUXARGS_ENTRY_32(pos, LINUX_AT_SECURE, 0); 282 AUXARGS_ENTRY_32(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 283 AUXARGS_ENTRY_32(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 284 AUXARGS_ENTRY_32(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 285 AUXARGS_ENTRY_32(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 286 AUXARGS_ENTRY_32(pos, LINUX_AT_PLATFORM, PTROUT(uplatform)); 287 if (args->execfd != -1) 288 AUXARGS_ENTRY_32(pos, AT_EXECFD, args->execfd); 289 AUXARGS_ENTRY_32(pos, AT_NULL, 0); 290 291 free(imgp->auxargs, M_TEMP); 292 imgp->auxargs = NULL; 293 294 base--; 295 suword32(base, (uint32_t)imgp->args->argc); 296 *stack_base = (register_t *)base; 297 return 0; 298 } 299 300 extern unsigned long linux_sznonrtsigcode; 301 302 static void 303 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 304 { 305 struct thread *td = curthread; 306 struct proc *p = td->td_proc; 307 struct sigacts *psp; 308 struct trapframe *regs; 309 struct l_rt_sigframe *fp, frame; 310 int oonstack; 311 int sig; 312 int code; 313 314 sig = ksi->ksi_signo; 315 code = ksi->ksi_code; 316 PROC_LOCK_ASSERT(p, MA_OWNED); 317 psp = p->p_sigacts; 318 mtx_assert(&psp->ps_mtx, MA_OWNED); 319 regs = td->td_frame; 320 oonstack = sigonstack(regs->tf_rsp); 321 322 #ifdef DEBUG 323 if (ldebug(rt_sendsig)) 324 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 325 catcher, sig, (void*)mask, code); 326 #endif 327 /* 328 * Allocate space for the signal handler context. 329 */ 330 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 331 SIGISMEMBER(psp->ps_sigonstack, sig)) { 332 fp = (struct l_rt_sigframe *)(td->td_sigstk.ss_sp + 333 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 334 } else 335 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 336 mtx_unlock(&psp->ps_mtx); 337 338 /* 339 * Build the argument list for the signal handler. 340 */ 341 if (p->p_sysent->sv_sigtbl) 342 if (sig <= p->p_sysent->sv_sigsize) 343 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 344 345 bzero(&frame, sizeof(frame)); 346 347 frame.sf_handler = PTROUT(catcher); 348 frame.sf_sig = sig; 349 frame.sf_siginfo = PTROUT(&fp->sf_si); 350 frame.sf_ucontext = PTROUT(&fp->sf_sc); 351 352 /* Fill in POSIX parts */ 353 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 354 355 /* 356 * Build the signal context to be used by sigreturn. 357 */ 358 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 359 frame.sf_sc.uc_link = 0; /* XXX ??? */ 360 361 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 362 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 363 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 364 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 365 PROC_UNLOCK(p); 366 367 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 368 369 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__bits[0]; 370 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi; 371 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi; 372 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp; 373 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx; 374 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx; 375 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx; 376 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax; 377 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip; 378 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 379 frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs; 380 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 381 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 382 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 383 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags; 384 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 385 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 386 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 387 frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 388 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 389 390 #ifdef DEBUG 391 if (ldebug(rt_sendsig)) 392 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 393 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 394 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 395 #endif 396 397 if (copyout(&frame, fp, sizeof(frame)) != 0) { 398 /* 399 * Process has trashed its stack; give it an illegal 400 * instruction to halt it in its tracks. 401 */ 402 #ifdef DEBUG 403 if (ldebug(rt_sendsig)) 404 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 405 fp, oonstack); 406 #endif 407 PROC_LOCK(p); 408 sigexit(td, SIGILL); 409 } 410 411 /* 412 * Build context to run handler in. 413 */ 414 regs->tf_rsp = PTROUT(fp); 415 regs->tf_rip = LINUX32_PS_STRINGS - *(p->p_sysent->sv_szsigcode) + 416 linux_sznonrtsigcode; 417 regs->tf_rflags &= ~(PSL_T | PSL_D); 418 regs->tf_cs = _ucode32sel; 419 regs->tf_ss = _udatasel; 420 regs->tf_ds = _udatasel; 421 regs->tf_es = _udatasel; 422 regs->tf_fs = _ufssel; 423 regs->tf_gs = _ugssel; 424 regs->tf_flags = TF_HASSEGS; 425 td->td_pcb->pcb_full_iret = 1; 426 PROC_LOCK(p); 427 mtx_lock(&psp->ps_mtx); 428 } 429 430 431 /* 432 * Send an interrupt to process. 433 * 434 * Stack is set up to allow sigcode stored 435 * in u. to call routine, followed by kcall 436 * to sigreturn routine below. After sigreturn 437 * resets the signal mask, the stack, and the 438 * frame pointer, it returns to the user 439 * specified pc, psl. 440 */ 441 static void 442 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 443 { 444 struct thread *td = curthread; 445 struct proc *p = td->td_proc; 446 struct sigacts *psp; 447 struct trapframe *regs; 448 struct l_sigframe *fp, frame; 449 l_sigset_t lmask; 450 int oonstack, i; 451 int sig, code; 452 453 sig = ksi->ksi_signo; 454 code = ksi->ksi_code; 455 PROC_LOCK_ASSERT(p, MA_OWNED); 456 psp = p->p_sigacts; 457 mtx_assert(&psp->ps_mtx, MA_OWNED); 458 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 459 /* Signal handler installed with SA_SIGINFO. */ 460 linux_rt_sendsig(catcher, ksi, mask); 461 return; 462 } 463 464 regs = td->td_frame; 465 oonstack = sigonstack(regs->tf_rsp); 466 467 #ifdef DEBUG 468 if (ldebug(sendsig)) 469 printf(ARGS(sendsig, "%p, %d, %p, %u"), 470 catcher, sig, (void*)mask, code); 471 #endif 472 473 /* 474 * Allocate space for the signal handler context. 475 */ 476 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 477 SIGISMEMBER(psp->ps_sigonstack, sig)) { 478 fp = (struct l_sigframe *)(td->td_sigstk.ss_sp + 479 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 480 } else 481 fp = (struct l_sigframe *)regs->tf_rsp - 1; 482 mtx_unlock(&psp->ps_mtx); 483 PROC_UNLOCK(p); 484 485 /* 486 * Build the argument list for the signal handler. 487 */ 488 if (p->p_sysent->sv_sigtbl) 489 if (sig <= p->p_sysent->sv_sigsize) 490 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 491 492 bzero(&frame, sizeof(frame)); 493 494 frame.sf_handler = PTROUT(catcher); 495 frame.sf_sig = sig; 496 497 bsd_to_linux_sigset(mask, &lmask); 498 499 /* 500 * Build the signal context to be used by sigreturn. 501 */ 502 frame.sf_sc.sc_mask = lmask.__bits[0]; 503 frame.sf_sc.sc_gs = regs->tf_gs; 504 frame.sf_sc.sc_fs = regs->tf_fs; 505 frame.sf_sc.sc_es = regs->tf_es; 506 frame.sf_sc.sc_ds = regs->tf_ds; 507 frame.sf_sc.sc_edi = regs->tf_rdi; 508 frame.sf_sc.sc_esi = regs->tf_rsi; 509 frame.sf_sc.sc_ebp = regs->tf_rbp; 510 frame.sf_sc.sc_ebx = regs->tf_rbx; 511 frame.sf_sc.sc_edx = regs->tf_rdx; 512 frame.sf_sc.sc_ecx = regs->tf_rcx; 513 frame.sf_sc.sc_eax = regs->tf_rax; 514 frame.sf_sc.sc_eip = regs->tf_rip; 515 frame.sf_sc.sc_cs = regs->tf_cs; 516 frame.sf_sc.sc_eflags = regs->tf_rflags; 517 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 518 frame.sf_sc.sc_ss = regs->tf_ss; 519 frame.sf_sc.sc_err = regs->tf_err; 520 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 521 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 522 523 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++) 524 frame.sf_extramask[i] = lmask.__bits[i+1]; 525 526 if (copyout(&frame, fp, sizeof(frame)) != 0) { 527 /* 528 * Process has trashed its stack; give it an illegal 529 * instruction to halt it in its tracks. 530 */ 531 PROC_LOCK(p); 532 sigexit(td, SIGILL); 533 } 534 535 /* 536 * Build context to run handler in. 537 */ 538 regs->tf_rsp = PTROUT(fp); 539 regs->tf_rip = LINUX32_PS_STRINGS - *(p->p_sysent->sv_szsigcode); 540 regs->tf_rflags &= ~(PSL_T | PSL_D); 541 regs->tf_cs = _ucode32sel; 542 regs->tf_ss = _udatasel; 543 regs->tf_ds = _udatasel; 544 regs->tf_es = _udatasel; 545 regs->tf_fs = _ufssel; 546 regs->tf_gs = _ugssel; 547 regs->tf_flags = TF_HASSEGS; 548 td->td_pcb->pcb_full_iret = 1; 549 PROC_LOCK(p); 550 mtx_lock(&psp->ps_mtx); 551 } 552 553 /* 554 * System call to cleanup state after a signal 555 * has been taken. Reset signal mask and 556 * stack state from context left by sendsig (above). 557 * Return to previous pc and psl as specified by 558 * context left by sendsig. Check carefully to 559 * make sure that the user has not modified the 560 * psl to gain improper privileges or to cause 561 * a machine fault. 562 */ 563 int 564 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 565 { 566 struct l_sigframe frame; 567 struct trapframe *regs; 568 sigset_t bmask; 569 l_sigset_t lmask; 570 int eflags, i; 571 ksiginfo_t ksi; 572 573 regs = td->td_frame; 574 575 #ifdef DEBUG 576 if (ldebug(sigreturn)) 577 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 578 #endif 579 /* 580 * The trampoline code hands us the sigframe. 581 * It is unsafe to keep track of it ourselves, in the event that a 582 * program jumps out of a signal handler. 583 */ 584 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 585 return (EFAULT); 586 587 /* 588 * Check for security violations. 589 */ 590 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 591 eflags = frame.sf_sc.sc_eflags; 592 /* 593 * XXX do allow users to change the privileged flag PSL_RF. The 594 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 595 * sometimes set it there too. tf_eflags is kept in the signal 596 * context during signal handling and there is no other place 597 * to remember it, so the PSL_RF bit may be corrupted by the 598 * signal handler without us knowing. Corruption of the PSL_RF 599 * bit at worst causes one more or one less debugger trap, so 600 * allowing it is fairly harmless. 601 */ 602 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) 603 return(EINVAL); 604 605 /* 606 * Don't allow users to load a valid privileged %cs. Let the 607 * hardware check for invalid selectors, excess privilege in 608 * other selectors, invalid %eip's and invalid %esp's. 609 */ 610 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 611 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 612 ksiginfo_init_trap(&ksi); 613 ksi.ksi_signo = SIGBUS; 614 ksi.ksi_code = BUS_OBJERR; 615 ksi.ksi_trapno = T_PROTFLT; 616 ksi.ksi_addr = (void *)regs->tf_rip; 617 trapsignal(td, &ksi); 618 return(EINVAL); 619 } 620 621 lmask.__bits[0] = frame.sf_sc.sc_mask; 622 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++) 623 lmask.__bits[i+1] = frame.sf_extramask[i]; 624 linux_to_bsd_sigset(&lmask, &bmask); 625 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 626 627 /* 628 * Restore signal context. 629 */ 630 regs->tf_rdi = frame.sf_sc.sc_edi; 631 regs->tf_rsi = frame.sf_sc.sc_esi; 632 regs->tf_rbp = frame.sf_sc.sc_ebp; 633 regs->tf_rbx = frame.sf_sc.sc_ebx; 634 regs->tf_rdx = frame.sf_sc.sc_edx; 635 regs->tf_rcx = frame.sf_sc.sc_ecx; 636 regs->tf_rax = frame.sf_sc.sc_eax; 637 regs->tf_rip = frame.sf_sc.sc_eip; 638 regs->tf_cs = frame.sf_sc.sc_cs; 639 regs->tf_ds = frame.sf_sc.sc_ds; 640 regs->tf_es = frame.sf_sc.sc_es; 641 regs->tf_fs = frame.sf_sc.sc_fs; 642 regs->tf_gs = frame.sf_sc.sc_gs; 643 regs->tf_rflags = eflags; 644 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 645 regs->tf_ss = frame.sf_sc.sc_ss; 646 td->td_pcb->pcb_full_iret = 1; 647 648 return (EJUSTRETURN); 649 } 650 651 /* 652 * System call to cleanup state after a signal 653 * has been taken. Reset signal mask and 654 * stack state from context left by rt_sendsig (above). 655 * Return to previous pc and psl as specified by 656 * context left by sendsig. Check carefully to 657 * make sure that the user has not modified the 658 * psl to gain improper privileges or to cause 659 * a machine fault. 660 */ 661 int 662 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 663 { 664 struct l_ucontext uc; 665 struct l_sigcontext *context; 666 sigset_t bmask; 667 l_stack_t *lss; 668 stack_t ss; 669 struct trapframe *regs; 670 int eflags; 671 ksiginfo_t ksi; 672 673 regs = td->td_frame; 674 675 #ifdef DEBUG 676 if (ldebug(rt_sigreturn)) 677 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 678 #endif 679 /* 680 * The trampoline code hands us the ucontext. 681 * It is unsafe to keep track of it ourselves, in the event that a 682 * program jumps out of a signal handler. 683 */ 684 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 685 return (EFAULT); 686 687 context = &uc.uc_mcontext; 688 689 /* 690 * Check for security violations. 691 */ 692 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 693 eflags = context->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_rflags & ~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(context->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_rip; 719 trapsignal(td, &ksi); 720 return(EINVAL); 721 } 722 723 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 724 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 725 726 /* 727 * Restore signal context 728 */ 729 regs->tf_gs = context->sc_gs; 730 regs->tf_fs = context->sc_fs; 731 regs->tf_es = context->sc_es; 732 regs->tf_ds = context->sc_ds; 733 regs->tf_rdi = context->sc_edi; 734 regs->tf_rsi = context->sc_esi; 735 regs->tf_rbp = context->sc_ebp; 736 regs->tf_rbx = context->sc_ebx; 737 regs->tf_rdx = context->sc_edx; 738 regs->tf_rcx = context->sc_ecx; 739 regs->tf_rax = context->sc_eax; 740 regs->tf_rip = context->sc_eip; 741 regs->tf_cs = context->sc_cs; 742 regs->tf_rflags = eflags; 743 regs->tf_rsp = context->sc_esp_at_signal; 744 regs->tf_ss = context->sc_ss; 745 td->td_pcb->pcb_full_iret = 1; 746 747 /* 748 * call sigaltstack & ignore results.. 749 */ 750 lss = &uc.uc_stack; 751 ss.ss_sp = PTRIN(lss->ss_sp); 752 ss.ss_size = lss->ss_size; 753 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 754 755 #ifdef DEBUG 756 if (ldebug(rt_sigreturn)) 757 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 758 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 759 #endif 760 (void)kern_sigaltstack(td, &ss, NULL); 761 762 return (EJUSTRETURN); 763 } 764 765 static int 766 linux32_fetch_syscall_args(struct thread *td, struct syscall_args *sa) 767 { 768 struct proc *p; 769 struct trapframe *frame; 770 771 p = td->td_proc; 772 frame = td->td_frame; 773 774 sa->args[0] = frame->tf_rbx; 775 sa->args[1] = frame->tf_rcx; 776 sa->args[2] = frame->tf_rdx; 777 sa->args[3] = frame->tf_rsi; 778 sa->args[4] = frame->tf_rdi; 779 sa->args[5] = frame->tf_rbp; /* Unconfirmed */ 780 sa->code = frame->tf_rax; 781 782 if (sa->code >= p->p_sysent->sv_size) 783 sa->callp = &p->p_sysent->sv_table[0]; 784 else 785 sa->callp = &p->p_sysent->sv_table[sa->code]; 786 sa->narg = sa->callp->sy_narg; 787 788 td->td_retval[0] = 0; 789 td->td_retval[1] = frame->tf_rdx; 790 791 return (0); 792 } 793 794 /* 795 * If a linux binary is exec'ing something, try this image activator 796 * first. We override standard shell script execution in order to 797 * be able to modify the interpreter path. We only do this if a linux 798 * binary is doing the exec, so we do not create an EXEC module for it. 799 */ 800 static int exec_linux_imgact_try(struct image_params *iparams); 801 802 static int 803 exec_linux_imgact_try(struct image_params *imgp) 804 { 805 const char *head = (const char *)imgp->image_header; 806 char *rpath; 807 int error = -1, len; 808 809 /* 810 * The interpreter for shell scripts run from a linux binary needs 811 * to be located in /compat/linux if possible in order to recursively 812 * maintain linux path emulation. 813 */ 814 if (((const short *)head)[0] == SHELLMAGIC) { 815 /* 816 * Run our normal shell image activator. If it succeeds attempt 817 * to use the alternate path for the interpreter. If an 818 * alternate * path is found, use our stringspace to store it. 819 */ 820 if ((error = exec_shell_imgact(imgp)) == 0) { 821 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 822 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, 823 AT_FDCWD); 824 if (rpath != NULL) { 825 len = strlen(rpath) + 1; 826 827 if (len <= MAXSHELLCMDLEN) { 828 memcpy(imgp->interpreter_name, rpath, 829 len); 830 } 831 free(rpath, M_TEMP); 832 } 833 } 834 } 835 return(error); 836 } 837 838 /* 839 * Clear registers on exec 840 * XXX copied from ia32_signal.c. 841 */ 842 static void 843 exec_linux_setregs(td, entry, stack, ps_strings) 844 struct thread *td; 845 u_long entry; 846 u_long stack; 847 u_long ps_strings; 848 { 849 struct trapframe *regs = td->td_frame; 850 struct pcb *pcb = td->td_pcb; 851 852 mtx_lock(&dt_lock); 853 if (td->td_proc->p_md.md_ldt != NULL) 854 user_ldt_free(td); 855 else 856 mtx_unlock(&dt_lock); 857 858 critical_enter(); 859 wrmsr(MSR_FSBASE, 0); 860 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 861 pcb->pcb_fsbase = 0; 862 pcb->pcb_gsbase = 0; 863 critical_exit(); 864 pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 865 866 bzero((char *)regs, sizeof(struct trapframe)); 867 regs->tf_rip = entry; 868 regs->tf_rsp = stack; 869 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T); 870 regs->tf_gs = _ugssel; 871 regs->tf_fs = _ufssel; 872 regs->tf_es = _udatasel; 873 regs->tf_ds = _udatasel; 874 regs->tf_ss = _udatasel; 875 regs->tf_flags = TF_HASSEGS; 876 regs->tf_cs = _ucode32sel; 877 regs->tf_rbx = ps_strings; 878 load_cr0(rcr0() | CR0_MP | CR0_TS); 879 fpstate_drop(td); 880 881 /* Do full restore on return so that we can change to a different %cs */ 882 pcb->pcb_flags |= PCB_32BIT; 883 pcb->pcb_flags &= ~PCB_GS32BIT; 884 pcb->pcb_full_iret = 1; 885 td->td_retval[1] = 0; 886 } 887 888 /* 889 * XXX copied from ia32_sysvec.c. 890 */ 891 static register_t * 892 linux_copyout_strings(struct image_params *imgp) 893 { 894 int argc, envc; 895 u_int32_t *vectp; 896 char *stringp, *destp; 897 u_int32_t *stack_base; 898 struct linux32_ps_strings *arginfo; 899 900 /* 901 * Calculate string base and vector table pointers. 902 * Also deal with signal trampoline code for this exec type. 903 */ 904 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 905 destp = (caddr_t)arginfo - linux_szsigcode - SPARE_USRSPACE - 906 linux_szplatform - roundup((ARG_MAX - imgp->args->stringspace), 907 sizeof(char *)); 908 909 /* 910 * install sigcode 911 */ 912 copyout(imgp->proc->p_sysent->sv_sigcode, 913 ((caddr_t)arginfo - linux_szsigcode), linux_szsigcode); 914 915 /* 916 * Install LINUX_PLATFORM 917 */ 918 copyout(linux_platform, ((caddr_t)arginfo - linux_szsigcode - 919 linux_szplatform), linux_szplatform); 920 921 /* 922 * If we have a valid auxargs ptr, prepare some room 923 * on the stack. 924 */ 925 if (imgp->auxargs) { 926 /* 927 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 928 * lower compatibility. 929 */ 930 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 931 (LINUX_AT_COUNT * 2); 932 /* 933 * The '+ 2' is for the null pointers at the end of each of 934 * the arg and env vector sets,and imgp->auxarg_size is room 935 * for argument of Runtime loader. 936 */ 937 vectp = (u_int32_t *) (destp - (imgp->args->argc + 938 imgp->args->envc + 2 + imgp->auxarg_size) * 939 sizeof(u_int32_t)); 940 941 } else 942 /* 943 * The '+ 2' is for the null pointers at the end of each of 944 * the arg and env vector sets 945 */ 946 vectp = (u_int32_t *)(destp - (imgp->args->argc + 947 imgp->args->envc + 2) * sizeof(u_int32_t)); 948 949 /* 950 * vectp also becomes our initial stack base 951 */ 952 stack_base = vectp; 953 954 stringp = imgp->args->begin_argv; 955 argc = imgp->args->argc; 956 envc = imgp->args->envc; 957 /* 958 * Copy out strings - arguments and environment. 959 */ 960 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 961 962 /* 963 * Fill in "ps_strings" struct for ps, w, etc. 964 */ 965 suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp); 966 suword32(&arginfo->ps_nargvstr, argc); 967 968 /* 969 * Fill in argument portion of vector table. 970 */ 971 for (; argc > 0; --argc) { 972 suword32(vectp++, (uint32_t)(intptr_t)destp); 973 while (*stringp++ != 0) 974 destp++; 975 destp++; 976 } 977 978 /* a null vector table pointer separates the argp's from the envp's */ 979 suword32(vectp++, 0); 980 981 suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp); 982 suword32(&arginfo->ps_nenvstr, envc); 983 984 /* 985 * Fill in environment portion of vector table. 986 */ 987 for (; envc > 0; --envc) { 988 suword32(vectp++, (uint32_t)(intptr_t)destp); 989 while (*stringp++ != 0) 990 destp++; 991 destp++; 992 } 993 994 /* end of vector table is a null pointer */ 995 suword32(vectp, 0); 996 997 return ((register_t *)stack_base); 998 } 999 1000 SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW, 0, 1001 "32-bit Linux emulation"); 1002 1003 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 1004 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 1005 &linux32_maxdsiz, 0, ""); 1006 static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 1007 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 1008 &linux32_maxssiz, 0, ""); 1009 static u_long linux32_maxvmem = LINUX32_MAXVMEM; 1010 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 1011 &linux32_maxvmem, 0, ""); 1012 1013 static void 1014 linux32_fixlimit(struct rlimit *rl, int which) 1015 { 1016 1017 switch (which) { 1018 case RLIMIT_DATA: 1019 if (linux32_maxdsiz != 0) { 1020 if (rl->rlim_cur > linux32_maxdsiz) 1021 rl->rlim_cur = linux32_maxdsiz; 1022 if (rl->rlim_max > linux32_maxdsiz) 1023 rl->rlim_max = linux32_maxdsiz; 1024 } 1025 break; 1026 case RLIMIT_STACK: 1027 if (linux32_maxssiz != 0) { 1028 if (rl->rlim_cur > linux32_maxssiz) 1029 rl->rlim_cur = linux32_maxssiz; 1030 if (rl->rlim_max > linux32_maxssiz) 1031 rl->rlim_max = linux32_maxssiz; 1032 } 1033 break; 1034 case RLIMIT_VMEM: 1035 if (linux32_maxvmem != 0) { 1036 if (rl->rlim_cur > linux32_maxvmem) 1037 rl->rlim_cur = linux32_maxvmem; 1038 if (rl->rlim_max > linux32_maxvmem) 1039 rl->rlim_max = linux32_maxvmem; 1040 } 1041 break; 1042 } 1043 } 1044 1045 struct sysentvec elf_linux_sysvec = { 1046 .sv_size = LINUX_SYS_MAXSYSCALL, 1047 .sv_table = linux_sysent, 1048 .sv_mask = 0, 1049 .sv_sigsize = LINUX_SIGTBLSZ, 1050 .sv_sigtbl = bsd_to_linux_signal, 1051 .sv_errsize = ELAST + 1, 1052 .sv_errtbl = bsd_to_linux_errno, 1053 .sv_transtrap = translate_traps, 1054 .sv_fixup = elf_linux_fixup, 1055 .sv_sendsig = linux_sendsig, 1056 .sv_sigcode = linux_sigcode, 1057 .sv_szsigcode = &linux_szsigcode, 1058 .sv_prepsyscall = NULL, 1059 .sv_name = "Linux ELF32", 1060 .sv_coredump = elf32_coredump, 1061 .sv_imgact_try = exec_linux_imgact_try, 1062 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 1063 .sv_pagesize = PAGE_SIZE, 1064 .sv_minuser = VM_MIN_ADDRESS, 1065 .sv_maxuser = LINUX32_USRSTACK, 1066 .sv_usrstack = LINUX32_USRSTACK, 1067 .sv_psstrings = LINUX32_PS_STRINGS, 1068 .sv_stackprot = VM_PROT_ALL, 1069 .sv_copyout_strings = linux_copyout_strings, 1070 .sv_setregs = exec_linux_setregs, 1071 .sv_fixlimit = linux32_fixlimit, 1072 .sv_maxssiz = &linux32_maxssiz, 1073 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32, 1074 .sv_set_syscall_retval = cpu_set_syscall_retval, 1075 .sv_fetch_syscall_args = linux32_fetch_syscall_args, 1076 .sv_syscallnames = NULL, 1077 }; 1078 1079 static char GNU_ABI_VENDOR[] = "GNU"; 1080 static int GNULINUX_ABI_DESC = 0; 1081 1082 static boolean_t 1083 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel) 1084 { 1085 const Elf32_Word *desc; 1086 uintptr_t p; 1087 1088 p = (uintptr_t)(note + 1); 1089 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1090 1091 desc = (const Elf32_Word *)p; 1092 if (desc[0] != GNULINUX_ABI_DESC) 1093 return (FALSE); 1094 1095 /* 1096 * For linux we encode osrel as follows (see linux_mib.c): 1097 * VVVMMMIII (version, major, minor), see linux_mib.c. 1098 */ 1099 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 1100 1101 return (TRUE); 1102 } 1103 1104 static Elf_Brandnote linux32_brandnote = { 1105 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1106 .hdr.n_descsz = 16, /* XXX at least 16 */ 1107 .hdr.n_type = 1, 1108 .vendor = GNU_ABI_VENDOR, 1109 .flags = BN_TRANSLATE_OSREL, 1110 .trans_osrel = linux32_trans_osrel 1111 }; 1112 1113 static Elf32_Brandinfo linux_brand = { 1114 .brand = ELFOSABI_LINUX, 1115 .machine = EM_386, 1116 .compat_3_brand = "Linux", 1117 .emul_path = "/compat/linux", 1118 .interp_path = "/lib/ld-linux.so.1", 1119 .sysvec = &elf_linux_sysvec, 1120 .interp_newpath = NULL, 1121 .brand_note = &linux32_brandnote, 1122 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1123 }; 1124 1125 static Elf32_Brandinfo linux_glibc2brand = { 1126 .brand = ELFOSABI_LINUX, 1127 .machine = EM_386, 1128 .compat_3_brand = "Linux", 1129 .emul_path = "/compat/linux", 1130 .interp_path = "/lib/ld-linux.so.2", 1131 .sysvec = &elf_linux_sysvec, 1132 .interp_newpath = NULL, 1133 .brand_note = &linux32_brandnote, 1134 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1135 }; 1136 1137 Elf32_Brandinfo *linux_brandlist[] = { 1138 &linux_brand, 1139 &linux_glibc2brand, 1140 NULL 1141 }; 1142 1143 static int 1144 linux_elf_modevent(module_t mod, int type, void *data) 1145 { 1146 Elf32_Brandinfo **brandinfo; 1147 int error; 1148 struct linux_ioctl_handler **lihp; 1149 struct linux_device_handler **ldhp; 1150 1151 error = 0; 1152 1153 switch(type) { 1154 case MOD_LOAD: 1155 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1156 ++brandinfo) 1157 if (elf32_insert_brand_entry(*brandinfo) < 0) 1158 error = EINVAL; 1159 if (error == 0) { 1160 SET_FOREACH(lihp, linux_ioctl_handler_set) 1161 linux_ioctl_register_handler(*lihp); 1162 SET_FOREACH(ldhp, linux_device_handler_set) 1163 linux_device_register_handler(*ldhp); 1164 mtx_init(&emul_lock, "emuldata lock", NULL, MTX_DEF); 1165 sx_init(&emul_shared_lock, "emuldata->shared lock"); 1166 LIST_INIT(&futex_list); 1167 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1168 linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, 1169 linux_proc_exit, NULL, 1000); 1170 linux_schedtail_tag = EVENTHANDLER_REGISTER(schedtail, 1171 linux_schedtail, NULL, 1000); 1172 linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, 1173 linux_proc_exec, NULL, 1000); 1174 linux_szplatform = roundup(strlen(linux_platform) + 1, 1175 sizeof(char *)); 1176 linux_osd_jail_register(); 1177 stclohz = (stathz ? stathz : hz); 1178 if (bootverbose) 1179 printf("Linux ELF exec handler installed\n"); 1180 } else 1181 printf("cannot insert Linux ELF brand handler\n"); 1182 break; 1183 case MOD_UNLOAD: 1184 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1185 ++brandinfo) 1186 if (elf32_brand_inuse(*brandinfo)) 1187 error = EBUSY; 1188 if (error == 0) { 1189 for (brandinfo = &linux_brandlist[0]; 1190 *brandinfo != NULL; ++brandinfo) 1191 if (elf32_remove_brand_entry(*brandinfo) < 0) 1192 error = EINVAL; 1193 } 1194 if (error == 0) { 1195 SET_FOREACH(lihp, linux_ioctl_handler_set) 1196 linux_ioctl_unregister_handler(*lihp); 1197 SET_FOREACH(ldhp, linux_device_handler_set) 1198 linux_device_unregister_handler(*ldhp); 1199 mtx_destroy(&emul_lock); 1200 sx_destroy(&emul_shared_lock); 1201 mtx_destroy(&futex_mtx); 1202 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag); 1203 EVENTHANDLER_DEREGISTER(schedtail, linux_schedtail_tag); 1204 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag); 1205 linux_osd_jail_deregister(); 1206 if (bootverbose) 1207 printf("Linux ELF exec handler removed\n"); 1208 } else 1209 printf("Could not deinstall ELF interpreter entry\n"); 1210 break; 1211 default: 1212 return EOPNOTSUPP; 1213 } 1214 return error; 1215 } 1216 1217 static moduledata_t linux_elf_mod = { 1218 "linuxelf", 1219 linux_elf_modevent, 1220 0 1221 }; 1222 1223 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
Cache object: 6bc37a41cd201e63915f9a0bf22e14b2
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