The Design and Implementation of the FreeBSD Operating System, Second Edition
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("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/exec.h>
   35 #include <sys/fcntl.h>
   36 #include <sys/imgact.h>
   37 #include <sys/imgact_aout.h>
   38 #include <sys/imgact_elf.h>
   39 #include <sys/kernel.h>
   40 #include <sys/lock.h>
   41 #include <sys/malloc.h>
   42 #include <sys/module.h>
   43 #include <sys/mutex.h>
   44 #include <sys/proc.h>
   45 #include <sys/signalvar.h>
   46 #include <sys/syscallsubr.h>
   47 #include <sys/sysctl.h>
   48 #include <sys/sysent.h>
   49 #include <sys/sysproto.h>
   50 #include <sys/vnode.h>
   51 #include <sys/eventhandler.h>
   52 
   53 #include <vm/vm.h>
   54 #include <vm/pmap.h>
   55 #include <vm/vm_extern.h>
   56 #include <vm/vm_map.h>
   57 #include <vm/vm_object.h>
   58 #include <vm/vm_page.h>
   59 #include <vm/vm_param.h>
   60 
   61 #include <machine/cpu.h>
   62 #include <machine/cputypes.h>
   63 #include <machine/md_var.h>
   64 #include <machine/pcb.h>
   65 
   66 #include <i386/linux/linux.h>
   67 #include <i386/linux/linux_proto.h>
   68 #include <compat/linux/linux_emul.h>
   69 #include <compat/linux/linux_futex.h>
   70 #include <compat/linux/linux_ioctl.h>
   71 #include <compat/linux/linux_mib.h>
   72 #include <compat/linux/linux_misc.h>
   73 #include <compat/linux/linux_signal.h>
   74 #include <compat/linux/linux_util.h>
   75 #include <compat/linux/linux_vdso.h>
   76 
   77 MODULE_VERSION(linux, 1);
   78 
   79 #if defined(DEBUG)
   80 SYSCTL_PROC(_compat_linux, OID_AUTO, debug, CTLTYPE_STRING | CTLFLAG_RW, 0, 0,
   81     linux_sysctl_debug, "A", "Linux debugging control");
   82 #endif
   83 
   84 /*
   85  * Allow the sendsig functions to use the ldebug() facility even though they
   86  * are not syscalls themselves.  Map them to syscall 0.  This is slightly less
   87  * bogus than using ldebug(sigreturn).
   88  */
   89 #define LINUX_SYS_linux_rt_sendsig      0
   90 #define LINUX_SYS_linux_sendsig         0
   91 
   92 #define LINUX_PS_STRINGS        (LINUX_USRSTACK - sizeof(struct ps_strings))
   93 
   94 static int linux_szsigcode;
   95 static vm_object_t linux_shared_page_obj;
   96 static char *linux_shared_page_mapping;
   97 extern char _binary_linux_locore_o_start;
   98 extern char _binary_linux_locore_o_end;
   99 
  100 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
  101 
  102 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
  103 
  104 static int      linux_fixup(register_t **stack_base,
  105                     struct image_params *iparams);
  106 static int      linux_fixup_elf(register_t **stack_base,
  107                     struct image_params *iparams);
  108 static void     linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
  109 static void     linux_exec_setregs(struct thread *td,
  110                     struct image_params *imgp, u_long stack);
  111 static register_t *linux_copyout_strings(struct image_params *imgp);
  112 static bool     linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
  113 static void     linux_vdso_install(void *param);
  114 static void     linux_vdso_deinstall(void *param);
  115 
  116 static int linux_szplatform;
  117 const char *linux_kplatform;
  118 
  119 static eventhandler_tag linux_exit_tag;
  120 static eventhandler_tag linux_exec_tag;
  121 static eventhandler_tag linux_thread_dtor_tag;
  122 
  123 #define LINUX_T_UNKNOWN  255
  124 static int _bsd_to_linux_trapcode[] = {
  125         LINUX_T_UNKNOWN,        /* 0 */
  126         6,                      /* 1  T_PRIVINFLT */
  127         LINUX_T_UNKNOWN,        /* 2 */
  128         3,                      /* 3  T_BPTFLT */
  129         LINUX_T_UNKNOWN,        /* 4 */
  130         LINUX_T_UNKNOWN,        /* 5 */
  131         16,                     /* 6  T_ARITHTRAP */
  132         254,                    /* 7  T_ASTFLT */
  133         LINUX_T_UNKNOWN,        /* 8 */
  134         13,                     /* 9  T_PROTFLT */
  135         1,                      /* 10 T_TRCTRAP */
  136         LINUX_T_UNKNOWN,        /* 11 */
  137         14,                     /* 12 T_PAGEFLT */
  138         LINUX_T_UNKNOWN,        /* 13 */
  139         17,                     /* 14 T_ALIGNFLT */
  140         LINUX_T_UNKNOWN,        /* 15 */
  141         LINUX_T_UNKNOWN,        /* 16 */
  142         LINUX_T_UNKNOWN,        /* 17 */
  143         0,                      /* 18 T_DIVIDE */
  144         2,                      /* 19 T_NMI */
  145         4,                      /* 20 T_OFLOW */
  146         5,                      /* 21 T_BOUND */
  147         7,                      /* 22 T_DNA */
  148         8,                      /* 23 T_DOUBLEFLT */
  149         9,                      /* 24 T_FPOPFLT */
  150         10,                     /* 25 T_TSSFLT */
  151         11,                     /* 26 T_SEGNPFLT */
  152         12,                     /* 27 T_STKFLT */
  153         18,                     /* 28 T_MCHK */
  154         19,                     /* 29 T_XMMFLT */
  155         15                      /* 30 T_RESERVED */
  156 };
  157 #define bsd_to_linux_trapcode(code) \
  158     ((code)<nitems(_bsd_to_linux_trapcode)? \
  159      _bsd_to_linux_trapcode[(code)]: \
  160      LINUX_T_UNKNOWN)
  161 
  162 LINUX_VDSO_SYM_INTPTR(linux_sigcode);
  163 LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode);
  164 LINUX_VDSO_SYM_INTPTR(linux_vsyscall);
  165 
  166 /*
  167  * If FreeBSD & Linux have a difference of opinion about what a trap
  168  * means, deal with it here.
  169  *
  170  * MPSAFE
  171  */
  172 static int
  173 linux_translate_traps(int signal, int trap_code)
  174 {
  175         if (signal != SIGBUS)
  176                 return (signal);
  177         switch (trap_code) {
  178         case T_PROTFLT:
  179         case T_TSSFLT:
  180         case T_DOUBLEFLT:
  181         case T_PAGEFLT:
  182                 return (SIGSEGV);
  183         default:
  184                 return (signal);
  185         }
  186 }
  187 
  188 static int
  189 linux_fixup(register_t **stack_base, struct image_params *imgp)
  190 {
  191         register_t *argv, *envp;
  192 
  193         argv = *stack_base;
  194         envp = *stack_base + (imgp->args->argc + 1);
  195         (*stack_base)--;
  196         suword(*stack_base, (intptr_t)(void *)envp);
  197         (*stack_base)--;
  198         suword(*stack_base, (intptr_t)(void *)argv);
  199         (*stack_base)--;
  200         suword(*stack_base, imgp->args->argc);
  201         return (0);
  202 }
  203 
  204 static int
  205 linux_fixup_elf(register_t **stack_base, struct image_params *imgp)
  206 {
  207         struct proc *p;
  208         Elf32_Auxargs *args;
  209         Elf32_Addr *uplatform;
  210         struct ps_strings *arginfo;
  211         register_t *pos;
  212         int issetugid;
  213 
  214         KASSERT(curthread->td_proc == imgp->proc,
  215             ("unsafe linux_fixup_elf(), should be curproc"));
  216 
  217         p = imgp->proc;
  218         issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
  219         arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
  220         uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform);
  221         args = (Elf32_Auxargs *)imgp->auxargs;
  222         pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2);
  223 
  224         AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
  225             imgp->proc->p_sysent->sv_shared_page_base);
  226         AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux_vsyscall);
  227         AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
  228 
  229         /*
  230          * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0,
  231          * as it has appeared in the 2.4.0-rc7 first time.
  232          * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK),
  233          * glibc falls back to the hard-coded CLK_TCK value when aux entry
  234          * is not present.
  235          * Also see linux_times() implementation.
  236          */
  237         if (linux_kernver(curthread) >= LINUX_KERNVER_2004000)
  238                 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
  239         AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
  240         AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
  241         AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
  242         AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
  243         AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
  244         AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
  245         AUXARGS_ENTRY(pos, AT_BASE, args->base);
  246         AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
  247         AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
  248         AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
  249         AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
  250         AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
  251         AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(uplatform));
  252         AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary);
  253         if (imgp->execpathp != 0)
  254                 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp);
  255         if (args->execfd != -1)
  256                 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
  257         AUXARGS_ENTRY(pos, AT_NULL, 0);
  258 
  259         free(imgp->auxargs, M_TEMP);
  260         imgp->auxargs = NULL;
  261 
  262         (*stack_base)--;
  263         suword(*stack_base, (register_t)imgp->args->argc);
  264         return (0);
  265 }
  266 
  267 /*
  268  * Copied from kern/kern_exec.c
  269  */
  270 static register_t *
  271 linux_copyout_strings(struct image_params *imgp)
  272 {
  273         int argc, envc;
  274         char **vectp;
  275         char *stringp, *destp;
  276         register_t *stack_base;
  277         struct ps_strings *arginfo;
  278         char canary[LINUX_AT_RANDOM_LEN];
  279         size_t execpath_len;
  280         struct proc *p;
  281 
  282         /* Calculate string base and vector table pointers. */
  283         p = imgp->proc;
  284         if (imgp->execpath != NULL && imgp->auxargs != NULL)
  285                 execpath_len = strlen(imgp->execpath) + 1;
  286         else
  287                 execpath_len = 0;
  288         arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
  289         destp = (caddr_t)arginfo - SPARE_USRSPACE - linux_szplatform -
  290             roundup(sizeof(canary), sizeof(char *)) -
  291             roundup(execpath_len, sizeof(char *)) -
  292             roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *));
  293 
  294         /* Install LINUX_PLATFORM. */
  295         copyout(linux_kplatform, ((caddr_t)arginfo - linux_szplatform),
  296             linux_szplatform);
  297 
  298         if (execpath_len != 0) {
  299                 imgp->execpathp = (uintptr_t)arginfo -
  300                 linux_szplatform - execpath_len;
  301                 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len);
  302         }
  303 
  304         /* Prepare the canary for SSP. */
  305         arc4rand(canary, sizeof(canary), 0);
  306         imgp->canary = (uintptr_t)arginfo - linux_szplatform -
  307             roundup(execpath_len, sizeof(char *)) -
  308             roundup(sizeof(canary), sizeof(char *));
  309         copyout(canary, (void *)imgp->canary, sizeof(canary));
  310 
  311         vectp = (char **)destp;
  312         if (imgp->auxargs) {
  313                 /*
  314                  * Allocate room on the stack for the ELF auxargs
  315                  * array.  It has LINUX_AT_COUNT entries.
  316                  */
  317                 vectp -= howmany(LINUX_AT_COUNT * sizeof(Elf32_Auxinfo),
  318                     sizeof(*vectp));
  319         }
  320 
  321         /*
  322          * Allocate room for the argv[] and env vectors including the
  323          * terminating NULL pointers.
  324          */
  325         vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
  326 
  327         /* vectp also becomes our initial stack base. */
  328         stack_base = (register_t *)vectp;
  329 
  330         stringp = imgp->args->begin_argv;
  331         argc = imgp->args->argc;
  332         envc = imgp->args->envc;
  333 
  334         /* Copy out strings - arguments and environment. */
  335         copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
  336 
  337         /* Fill in "ps_strings" struct for ps, w, etc. */
  338         suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp);
  339         suword(&arginfo->ps_nargvstr, argc);
  340 
  341         /* Fill in argument portion of vector table. */
  342         for (; argc > 0; --argc) {
  343                 suword(vectp++, (long)(intptr_t)destp);
  344                 while (*stringp++ != 0)
  345                         destp++;
  346                 destp++;
  347         }
  348 
  349         /* A null vector table pointer separates the argp's from the envp's. */
  350         suword(vectp++, 0);
  351 
  352         suword(&arginfo->ps_envstr, (long)(intptr_t)vectp);
  353         suword(&arginfo->ps_nenvstr, envc);
  354 
  355         /* Fill in environment portion of vector table. */
  356         for (; envc > 0; --envc) {
  357                 suword(vectp++, (long)(intptr_t)destp);
  358                 while (*stringp++ != 0)
  359                         destp++;
  360                 destp++;
  361         }
  362 
  363         /* The end of the vector table is a null pointer. */
  364         suword(vectp, 0);
  365 
  366         return (stack_base);
  367 }
  368 
  369 static void
  370 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  371 {
  372         struct thread *td = curthread;
  373         struct proc *p = td->td_proc;
  374         struct sigacts *psp;
  375         struct trapframe *regs;
  376         struct l_rt_sigframe *fp, frame;
  377         int sig, code;
  378         int oonstack;
  379 
  380         sig = ksi->ksi_signo;
  381         code = ksi->ksi_code;
  382         PROC_LOCK_ASSERT(p, MA_OWNED);
  383         psp = p->p_sigacts;
  384         mtx_assert(&psp->ps_mtx, MA_OWNED);
  385         regs = td->td_frame;
  386         oonstack = sigonstack(regs->tf_esp);
  387 
  388 #ifdef DEBUG
  389         if (ldebug(rt_sendsig))
  390                 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"),
  391                     catcher, sig, (void*)mask, code);
  392 #endif
  393         /* Allocate space for the signal handler context. */
  394         if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
  395             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  396                 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
  397                     td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
  398         } else
  399                 fp = (struct l_rt_sigframe *)regs->tf_esp - 1;
  400         mtx_unlock(&psp->ps_mtx);
  401 
  402         /* Build the argument list for the signal handler. */
  403         sig = bsd_to_linux_signal(sig);
  404 
  405         bzero(&frame, sizeof(frame));
  406 
  407         frame.sf_handler = catcher;
  408         frame.sf_sig = sig;
  409         frame.sf_siginfo = &fp->sf_si;
  410         frame.sf_ucontext = &fp->sf_sc;
  411 
  412         /* Fill in POSIX parts. */
  413         ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig);
  414 
  415         /* Build the signal context to be used by sigreturn. */
  416         frame.sf_sc.uc_flags = 0;               /* XXX ??? */
  417         frame.sf_sc.uc_link = NULL;             /* XXX ??? */
  418 
  419         frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp;
  420         frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
  421         frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
  422             ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
  423         PROC_UNLOCK(p);
  424 
  425         bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask);
  426 
  427         frame.sf_sc.uc_mcontext.sc_mask   = frame.sf_sc.uc_sigmask.__mask;
  428         frame.sf_sc.uc_mcontext.sc_gs     = rgs();
  429         frame.sf_sc.uc_mcontext.sc_fs     = regs->tf_fs;
  430         frame.sf_sc.uc_mcontext.sc_es     = regs->tf_es;
  431         frame.sf_sc.uc_mcontext.sc_ds     = regs->tf_ds;
  432         frame.sf_sc.uc_mcontext.sc_edi    = regs->tf_edi;
  433         frame.sf_sc.uc_mcontext.sc_esi    = regs->tf_esi;
  434         frame.sf_sc.uc_mcontext.sc_ebp    = regs->tf_ebp;
  435         frame.sf_sc.uc_mcontext.sc_ebx    = regs->tf_ebx;
  436         frame.sf_sc.uc_mcontext.sc_esp    = regs->tf_esp;
  437         frame.sf_sc.uc_mcontext.sc_edx    = regs->tf_edx;
  438         frame.sf_sc.uc_mcontext.sc_ecx    = regs->tf_ecx;
  439         frame.sf_sc.uc_mcontext.sc_eax    = regs->tf_eax;
  440         frame.sf_sc.uc_mcontext.sc_eip    = regs->tf_eip;
  441         frame.sf_sc.uc_mcontext.sc_cs     = regs->tf_cs;
  442         frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags;
  443         frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp;
  444         frame.sf_sc.uc_mcontext.sc_ss     = regs->tf_ss;
  445         frame.sf_sc.uc_mcontext.sc_err    = regs->tf_err;
  446         frame.sf_sc.uc_mcontext.sc_cr2    = (register_t)ksi->ksi_addr;
  447         frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
  448 
  449 #ifdef DEBUG
  450         if (ldebug(rt_sendsig))
  451                 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"),
  452                     frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp,
  453                     td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask);
  454 #endif
  455 
  456         if (copyout(&frame, fp, sizeof(frame)) != 0) {
  457                 /*
  458                  * Process has trashed its stack; give it an illegal
  459                  * instruction to halt it in its tracks.
  460                  */
  461 #ifdef DEBUG
  462                 if (ldebug(rt_sendsig))
  463                         printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"),
  464                             fp, oonstack);
  465 #endif
  466                 PROC_LOCK(p);
  467                 sigexit(td, SIGILL);
  468         }
  469 
  470         /* Build context to run handler in. */
  471         regs->tf_esp = (int)fp;
  472         regs->tf_eip = linux_rt_sigcode;
  473         regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D);
  474         regs->tf_cs = _ucodesel;
  475         regs->tf_ds = _udatasel;
  476         regs->tf_es = _udatasel;
  477         regs->tf_fs = _udatasel;
  478         regs->tf_ss = _udatasel;
  479         PROC_LOCK(p);
  480         mtx_lock(&psp->ps_mtx);
  481 }
  482 
  483 
  484 /*
  485  * Send an interrupt to process.
  486  *
  487  * Stack is set up to allow sigcode stored
  488  * in u. to call routine, followed by kcall
  489  * to sigreturn routine below.  After sigreturn
  490  * resets the signal mask, the stack, and the
  491  * frame pointer, it returns to the user
  492  * specified pc, psl.
  493  */
  494 static void
  495 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  496 {
  497         struct thread *td = curthread;
  498         struct proc *p = td->td_proc;
  499         struct sigacts *psp;
  500         struct trapframe *regs;
  501         struct l_sigframe *fp, frame;
  502         l_sigset_t lmask;
  503         int sig, code;
  504         int oonstack;
  505 
  506         PROC_LOCK_ASSERT(p, MA_OWNED);
  507         psp = p->p_sigacts;
  508         sig = ksi->ksi_signo;
  509         code = ksi->ksi_code;
  510         mtx_assert(&psp->ps_mtx, MA_OWNED);
  511         if (SIGISMEMBER(psp->ps_siginfo, sig)) {
  512                 /* Signal handler installed with SA_SIGINFO. */
  513                 linux_rt_sendsig(catcher, ksi, mask);
  514                 return;
  515         }
  516         regs = td->td_frame;
  517         oonstack = sigonstack(regs->tf_esp);
  518 
  519 #ifdef DEBUG
  520         if (ldebug(sendsig))
  521                 printf(ARGS(sendsig, "%p, %d, %p, %u"),
  522                     catcher, sig, (void*)mask, code);
  523 #endif
  524 
  525         /* Allocate space for the signal handler context. */
  526         if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
  527             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  528                 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
  529                     td->td_sigstk.ss_size - sizeof(struct l_sigframe));
  530         } else
  531                 fp = (struct l_sigframe *)regs->tf_esp - 1;
  532         mtx_unlock(&psp->ps_mtx);
  533         PROC_UNLOCK(p);
  534 
  535         /* Build the argument list for the signal handler. */
  536         sig = bsd_to_linux_signal(sig);
  537 
  538         bzero(&frame, sizeof(frame));
  539 
  540         frame.sf_handler = catcher;
  541         frame.sf_sig = sig;
  542 
  543         bsd_to_linux_sigset(mask, &lmask);
  544 
  545         /* Build the signal context to be used by sigreturn. */
  546         frame.sf_sc.sc_mask   = lmask.__mask;
  547         frame.sf_sc.sc_gs     = rgs();
  548         frame.sf_sc.sc_fs     = regs->tf_fs;
  549         frame.sf_sc.sc_es     = regs->tf_es;
  550         frame.sf_sc.sc_ds     = regs->tf_ds;
  551         frame.sf_sc.sc_edi    = regs->tf_edi;
  552         frame.sf_sc.sc_esi    = regs->tf_esi;
  553         frame.sf_sc.sc_ebp    = regs->tf_ebp;
  554         frame.sf_sc.sc_ebx    = regs->tf_ebx;
  555         frame.sf_sc.sc_esp    = regs->tf_esp;
  556         frame.sf_sc.sc_edx    = regs->tf_edx;
  557         frame.sf_sc.sc_ecx    = regs->tf_ecx;
  558         frame.sf_sc.sc_eax    = regs->tf_eax;
  559         frame.sf_sc.sc_eip    = regs->tf_eip;
  560         frame.sf_sc.sc_cs     = regs->tf_cs;
  561         frame.sf_sc.sc_eflags = regs->tf_eflags;
  562         frame.sf_sc.sc_esp_at_signal = regs->tf_esp;
  563         frame.sf_sc.sc_ss     = regs->tf_ss;
  564         frame.sf_sc.sc_err    = regs->tf_err;
  565         frame.sf_sc.sc_cr2    = (register_t)ksi->ksi_addr;
  566         frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno);
  567 
  568         frame.sf_extramask[0] = lmask.__mask;
  569 
  570         if (copyout(&frame, fp, sizeof(frame)) != 0) {
  571                 /*
  572                  * Process has trashed its stack; give it an illegal
  573                  * instruction to halt it in its tracks.
  574                  */
  575                 PROC_LOCK(p);
  576                 sigexit(td, SIGILL);
  577         }
  578 
  579         /* Build context to run handler in. */
  580         regs->tf_esp = (int)fp;
  581         regs->tf_eip = linux_sigcode;
  582         regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D);
  583         regs->tf_cs = _ucodesel;
  584         regs->tf_ds = _udatasel;
  585         regs->tf_es = _udatasel;
  586         regs->tf_fs = _udatasel;
  587         regs->tf_ss = _udatasel;
  588         PROC_LOCK(p);
  589         mtx_lock(&psp->ps_mtx);
  590 }
  591 
  592 /*
  593  * System call to cleanup state after a signal
  594  * has been taken.  Reset signal mask and
  595  * stack state from context left by sendsig (above).
  596  * Return to previous pc and psl as specified by
  597  * context left by sendsig. Check carefully to
  598  * make sure that the user has not modified the
  599  * psl to gain improper privileges or to cause
  600  * a machine fault.
  601  */
  602 int
  603 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
  604 {
  605         struct l_sigframe frame;
  606         struct trapframe *regs;
  607         l_sigset_t lmask;
  608         sigset_t bmask;
  609         int eflags;
  610         ksiginfo_t ksi;
  611 
  612         regs = td->td_frame;
  613 
  614 #ifdef DEBUG
  615         if (ldebug(sigreturn))
  616                 printf(ARGS(sigreturn, "%p"), (void *)args->sfp);
  617 #endif
  618         /*
  619          * The trampoline code hands us the sigframe.
  620          * It is unsafe to keep track of it ourselves, in the event that a
  621          * program jumps out of a signal handler.
  622          */
  623         if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
  624                 return (EFAULT);
  625 
  626         /* Check for security violations. */
  627 #define EFLAGS_SECURE(ef, oef)  ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
  628         eflags = frame.sf_sc.sc_eflags;
  629         if (!EFLAGS_SECURE(eflags, regs->tf_eflags))
  630                 return (EINVAL);
  631 
  632         /*
  633          * Don't allow users to load a valid privileged %cs.  Let the
  634          * hardware check for invalid selectors, excess privilege in
  635          * other selectors, invalid %eip's and invalid %esp's.
  636          */
  637 #define CS_SECURE(cs)   (ISPL(cs) == SEL_UPL)
  638         if (!CS_SECURE(frame.sf_sc.sc_cs)) {
  639                 ksiginfo_init_trap(&ksi);
  640                 ksi.ksi_signo = SIGBUS;
  641                 ksi.ksi_code = BUS_OBJERR;
  642                 ksi.ksi_trapno = T_PROTFLT;
  643                 ksi.ksi_addr = (void *)regs->tf_eip;
  644                 trapsignal(td, &ksi);
  645                 return (EINVAL);
  646         }
  647 
  648         lmask.__mask = frame.sf_sc.sc_mask;
  649         linux_to_bsd_sigset(&lmask, &bmask);
  650         kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
  651 
  652         /* Restore signal context. */
  653         /* %gs was restored by the trampoline. */
  654         regs->tf_fs     = frame.sf_sc.sc_fs;
  655         regs->tf_es     = frame.sf_sc.sc_es;
  656         regs->tf_ds     = frame.sf_sc.sc_ds;
  657         regs->tf_edi    = frame.sf_sc.sc_edi;
  658         regs->tf_esi    = frame.sf_sc.sc_esi;
  659         regs->tf_ebp    = frame.sf_sc.sc_ebp;
  660         regs->tf_ebx    = frame.sf_sc.sc_ebx;
  661         regs->tf_edx    = frame.sf_sc.sc_edx;
  662         regs->tf_ecx    = frame.sf_sc.sc_ecx;
  663         regs->tf_eax    = frame.sf_sc.sc_eax;
  664         regs->tf_eip    = frame.sf_sc.sc_eip;
  665         regs->tf_cs     = frame.sf_sc.sc_cs;
  666         regs->tf_eflags = eflags;
  667         regs->tf_esp    = frame.sf_sc.sc_esp_at_signal;
  668         regs->tf_ss     = frame.sf_sc.sc_ss;
  669 
  670         return (EJUSTRETURN);
  671 }
  672 
  673 /*
  674  * System call to cleanup state after a signal
  675  * has been taken.  Reset signal mask and
  676  * stack state from context left by rt_sendsig (above).
  677  * Return to previous pc and psl as specified by
  678  * context left by sendsig. Check carefully to
  679  * make sure that the user has not modified the
  680  * psl to gain improper privileges or to cause
  681  * a machine fault.
  682  */
  683 int
  684 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
  685 {
  686         struct l_ucontext uc;
  687         struct l_sigcontext *context;
  688         sigset_t bmask;
  689         l_stack_t *lss;
  690         stack_t ss;
  691         struct trapframe *regs;
  692         int eflags;
  693         ksiginfo_t ksi;
  694 
  695         regs = td->td_frame;
  696 
  697 #ifdef DEBUG
  698         if (ldebug(rt_sigreturn))
  699                 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp);
  700 #endif
  701         /*
  702          * The trampoline code hands us the ucontext.
  703          * It is unsafe to keep track of it ourselves, in the event that a
  704          * program jumps out of a signal handler.
  705          */
  706         if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
  707                 return (EFAULT);
  708 
  709         context = &uc.uc_mcontext;
  710 
  711         /* Check for security violations. */
  712 #define EFLAGS_SECURE(ef, oef)  ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
  713         eflags = context->sc_eflags;
  714         if (!EFLAGS_SECURE(eflags, regs->tf_eflags))
  715                 return (EINVAL);
  716 
  717         /*
  718          * Don't allow users to load a valid privileged %cs.  Let the
  719          * hardware check for invalid selectors, excess privilege in
  720          * other selectors, invalid %eip's and invalid %esp's.
  721          */
  722 #define CS_SECURE(cs)   (ISPL(cs) == SEL_UPL)
  723         if (!CS_SECURE(context->sc_cs)) {
  724                 ksiginfo_init_trap(&ksi);
  725                 ksi.ksi_signo = SIGBUS;
  726                 ksi.ksi_code = BUS_OBJERR;
  727                 ksi.ksi_trapno = T_PROTFLT;
  728                 ksi.ksi_addr = (void *)regs->tf_eip;
  729                 trapsignal(td, &ksi);
  730                 return (EINVAL);
  731         }
  732 
  733         linux_to_bsd_sigset(&uc.uc_sigmask, &bmask);
  734         kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
  735 
  736         /* Restore signal context. */
  737         /* %gs was restored by the trampoline. */
  738         regs->tf_fs     = context->sc_fs;
  739         regs->tf_es     = context->sc_es;
  740         regs->tf_ds     = context->sc_ds;
  741         regs->tf_edi    = context->sc_edi;
  742         regs->tf_esi    = context->sc_esi;
  743         regs->tf_ebp    = context->sc_ebp;
  744         regs->tf_ebx    = context->sc_ebx;
  745         regs->tf_edx    = context->sc_edx;
  746         regs->tf_ecx    = context->sc_ecx;
  747         regs->tf_eax    = context->sc_eax;
  748         regs->tf_eip    = context->sc_eip;
  749         regs->tf_cs     = context->sc_cs;
  750         regs->tf_eflags = eflags;
  751         regs->tf_esp    = context->sc_esp_at_signal;
  752         regs->tf_ss     = context->sc_ss;
  753 
  754         /* Call sigaltstack & ignore results. */
  755         lss = &uc.uc_stack;
  756         ss.ss_sp = lss->ss_sp;
  757         ss.ss_size = lss->ss_size;
  758         ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
  759 
  760 #ifdef DEBUG
  761         if (ldebug(rt_sigreturn))
  762                 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"),
  763                     ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask);
  764 #endif
  765         (void)kern_sigaltstack(td, &ss, NULL);
  766 
  767         return (EJUSTRETURN);
  768 }
  769 
  770 static int
  771 linux_fetch_syscall_args(struct thread *td)
  772 {
  773         struct proc *p;
  774         struct trapframe *frame;
  775         struct syscall_args *sa;
  776 
  777         p = td->td_proc;
  778         frame = td->td_frame;
  779         sa = &td->td_sa;
  780 
  781         sa->code = frame->tf_eax;
  782         sa->args[0] = frame->tf_ebx;
  783         sa->args[1] = frame->tf_ecx;
  784         sa->args[2] = frame->tf_edx;
  785         sa->args[3] = frame->tf_esi;
  786         sa->args[4] = frame->tf_edi;
  787         sa->args[5] = frame->tf_ebp;    /* Unconfirmed */
  788 
  789         if (sa->code >= p->p_sysent->sv_size)
  790                 /* nosys */
  791                 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1];
  792         else
  793                 sa->callp = &p->p_sysent->sv_table[sa->code];
  794         sa->narg = sa->callp->sy_narg;
  795 
  796         td->td_retval[0] = 0;
  797         td->td_retval[1] = frame->tf_edx;
  798 
  799         return (0);
  800 }
  801 
  802 /*
  803  * exec_setregs may initialize some registers differently than Linux
  804  * does, thus potentially confusing Linux binaries. If necessary, we
  805  * override the exec_setregs default(s) here.
  806  */
  807 static void
  808 linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
  809 {
  810         struct pcb *pcb = td->td_pcb;
  811 
  812         exec_setregs(td, imgp, stack);
  813 
  814         /* Linux sets %gs to 0, we default to _udatasel. */
  815         pcb->pcb_gs = 0;
  816         load_gs(0);
  817 
  818         pcb->pcb_initial_npxcw = __LINUX_NPXCW__;
  819 }
  820 
  821 static void
  822 linux_get_machine(const char **dst)
  823 {
  824 
  825         switch (cpu_class) {
  826         case CPUCLASS_686:
  827                 *dst = "i686";
  828                 break;
  829         case CPUCLASS_586:
  830                 *dst = "i586";
  831                 break;
  832         case CPUCLASS_486:
  833                 *dst = "i486";
  834                 break;
  835         default:
  836                 *dst = "i386";
  837         }
  838 }
  839 
  840 struct sysentvec linux_sysvec = {
  841         .sv_size        = LINUX_SYS_MAXSYSCALL,
  842         .sv_table       = linux_sysent,
  843         .sv_mask        = 0,
  844         .sv_errsize     = ELAST + 1,
  845         .sv_errtbl      = linux_errtbl,
  846         .sv_transtrap   = linux_translate_traps,
  847         .sv_fixup       = linux_fixup,
  848         .sv_sendsig     = linux_sendsig,
  849         .sv_sigcode     = &_binary_linux_locore_o_start,
  850         .sv_szsigcode   = &linux_szsigcode,
  851         .sv_name        = "Linux a.out",
  852         .sv_coredump    = NULL,
  853         .sv_imgact_try  = linux_exec_imgact_try,
  854         .sv_minsigstksz = LINUX_MINSIGSTKSZ,
  855         .sv_pagesize    = PAGE_SIZE,
  856         .sv_minuser     = VM_MIN_ADDRESS,
  857         .sv_maxuser     = VM_MAXUSER_ADDRESS,
  858         .sv_usrstack    = LINUX_USRSTACK,
  859         .sv_psstrings   = PS_STRINGS,
  860         .sv_stackprot   = VM_PROT_ALL,
  861         .sv_copyout_strings = exec_copyout_strings,
  862         .sv_setregs     = linux_exec_setregs,
  863         .sv_fixlimit    = NULL,
  864         .sv_maxssiz     = NULL,
  865         .sv_flags       = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32,
  866         .sv_set_syscall_retval = cpu_set_syscall_retval,
  867         .sv_fetch_syscall_args = linux_fetch_syscall_args,
  868         .sv_syscallnames = NULL,
  869         .sv_shared_page_base = LINUX_SHAREDPAGE,
  870         .sv_shared_page_len = PAGE_SIZE,
  871         .sv_schedtail   = linux_schedtail,
  872         .sv_thread_detach = linux_thread_detach,
  873         .sv_trap        = NULL,
  874 };
  875 INIT_SYSENTVEC(aout_sysvec, &linux_sysvec);
  876 
  877 struct sysentvec elf_linux_sysvec = {
  878         .sv_size        = LINUX_SYS_MAXSYSCALL,
  879         .sv_table       = linux_sysent,
  880         .sv_mask        = 0,
  881         .sv_errsize     = ELAST + 1,
  882         .sv_errtbl      = linux_errtbl,
  883         .sv_transtrap   = linux_translate_traps,
  884         .sv_fixup       = linux_fixup_elf,
  885         .sv_sendsig     = linux_sendsig,
  886         .sv_sigcode     = &_binary_linux_locore_o_start,
  887         .sv_szsigcode   = &linux_szsigcode,
  888         .sv_name        = "Linux ELF",
  889         .sv_coredump    = elf32_coredump,
  890         .sv_imgact_try  = linux_exec_imgact_try,
  891         .sv_minsigstksz = LINUX_MINSIGSTKSZ,
  892         .sv_pagesize    = PAGE_SIZE,
  893         .sv_minuser     = VM_MIN_ADDRESS,
  894         .sv_maxuser     = VM_MAXUSER_ADDRESS,
  895         .sv_usrstack    = LINUX_USRSTACK,
  896         .sv_psstrings   = LINUX_PS_STRINGS,
  897         .sv_stackprot   = VM_PROT_ALL,
  898         .sv_copyout_strings = linux_copyout_strings,
  899         .sv_setregs     = linux_exec_setregs,
  900         .sv_fixlimit    = NULL,
  901         .sv_maxssiz     = NULL,
  902         .sv_flags       = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP,
  903         .sv_set_syscall_retval = cpu_set_syscall_retval,
  904         .sv_fetch_syscall_args = linux_fetch_syscall_args,
  905         .sv_syscallnames = NULL,
  906         .sv_shared_page_base = LINUX_SHAREDPAGE,
  907         .sv_shared_page_len = PAGE_SIZE,
  908         .sv_schedtail   = linux_schedtail,
  909         .sv_thread_detach = linux_thread_detach,
  910         .sv_trap        = NULL,
  911 };
  912 
  913 static void
  914 linux_vdso_install(void *param)
  915 {
  916 
  917         linux_szsigcode = (&_binary_linux_locore_o_end -
  918             &_binary_linux_locore_o_start);
  919 
  920         if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
  921                 panic("Linux invalid vdso size\n");
  922 
  923         __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
  924 
  925         linux_shared_page_obj = __elfN(linux_shared_page_init)
  926             (&linux_shared_page_mapping);
  927 
  928         __elfN(linux_vdso_reloc)(&elf_linux_sysvec);
  929 
  930         bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
  931             linux_szsigcode);
  932         elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
  933 }
  934 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
  935     linux_vdso_install, NULL);
  936 
  937 static void
  938 linux_vdso_deinstall(void *param)
  939 {
  940 
  941         __elfN(linux_shared_page_fini)(linux_shared_page_obj);
  942 }
  943 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
  944     linux_vdso_deinstall, NULL);
  945 
  946 static char GNU_ABI_VENDOR[] = "GNU";
  947 static int GNULINUX_ABI_DESC = 0;
  948 
  949 static bool
  950 linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
  951 {
  952         const Elf32_Word *desc;
  953         uintptr_t p;
  954 
  955         p = (uintptr_t)(note + 1);
  956         p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
  957 
  958         desc = (const Elf32_Word *)p;
  959         if (desc[0] != GNULINUX_ABI_DESC)
  960                 return (false);
  961 
  962         /*
  963          * For Linux we encode osrel using the Linux convention of
  964          *      (version << 16) | (major << 8) | (minor)
  965          * See macro in linux_mib.h
  966          */
  967         *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]);
  968 
  969         return (true);
  970 }
  971 
  972 static Elf_Brandnote linux_brandnote = {
  973         .hdr.n_namesz   = sizeof(GNU_ABI_VENDOR),
  974         .hdr.n_descsz   = 16,   /* XXX at least 16 */
  975         .hdr.n_type     = 1,
  976         .vendor         = GNU_ABI_VENDOR,
  977         .flags          = BN_TRANSLATE_OSREL,
  978         .trans_osrel    = linux_trans_osrel
  979 };
  980 
  981 static Elf32_Brandinfo linux_brand = {
  982         .brand          = ELFOSABI_LINUX,
  983         .machine        = EM_386,
  984         .compat_3_brand = "Linux",
  985         .emul_path      = "/compat/linux",
  986         .interp_path    = "/lib/ld-linux.so.1",
  987         .sysvec         = &elf_linux_sysvec,
  988         .interp_newpath = NULL,
  989         .brand_note     = &linux_brandnote,
  990         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  991 };
  992 
  993 static Elf32_Brandinfo linux_glibc2brand = {
  994         .brand          = ELFOSABI_LINUX,
  995         .machine        = EM_386,
  996         .compat_3_brand = "Linux",
  997         .emul_path      = "/compat/linux",
  998         .interp_path    = "/lib/ld-linux.so.2",
  999         .sysvec         = &elf_linux_sysvec,
 1000         .interp_newpath = NULL,
 1001         .brand_note     = &linux_brandnote,
 1002         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 1003 };
 1004 
 1005 static Elf32_Brandinfo linux_muslbrand = {
 1006         .brand          = ELFOSABI_LINUX,
 1007         .machine        = EM_386,
 1008         .compat_3_brand = "Linux",
 1009         .emul_path      = "/compat/linux",
 1010         .interp_path    = "/lib/ld-musl-i386.so.1",
 1011         .sysvec         = &elf_linux_sysvec,
 1012         .interp_newpath = NULL,
 1013         .brand_note     = &linux_brandnote,
 1014         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 1015 };
 1016 
 1017 Elf32_Brandinfo *linux_brandlist[] = {
 1018         &linux_brand,
 1019         &linux_glibc2brand,
 1020         &linux_muslbrand,
 1021         NULL
 1022 };
 1023 
 1024 static int
 1025 linux_elf_modevent(module_t mod, int type, void *data)
 1026 {
 1027         Elf32_Brandinfo **brandinfo;
 1028         int error;
 1029         struct linux_ioctl_handler **lihp;
 1030 
 1031         error = 0;
 1032 
 1033         switch(type) {
 1034         case MOD_LOAD:
 1035                 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
 1036                      ++brandinfo)
 1037                         if (elf32_insert_brand_entry(*brandinfo) < 0)
 1038                                 error = EINVAL;
 1039                 if (error == 0) {
 1040                         SET_FOREACH(lihp, linux_ioctl_handler_set)
 1041                                 linux_ioctl_register_handler(*lihp);
 1042                         LIST_INIT(&futex_list);
 1043                         mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF);
 1044                         linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, linux_proc_exit,
 1045                               NULL, 1000);
 1046                         linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, linux_proc_exec,
 1047                               NULL, 1000);
 1048                         linux_thread_dtor_tag = EVENTHANDLER_REGISTER(thread_dtor,
 1049                             linux_thread_dtor, NULL, EVENTHANDLER_PRI_ANY);
 1050                         linux_get_machine(&linux_kplatform);
 1051                         linux_szplatform = roundup(strlen(linux_kplatform) + 1,
 1052                             sizeof(char *));
 1053                         linux_osd_jail_register();
 1054                         stclohz = (stathz ? stathz : hz);
 1055                         if (bootverbose)
 1056                                 printf("Linux ELF exec handler installed\n");
 1057                 } else
 1058                         printf("cannot insert Linux ELF brand handler\n");
 1059                 break;
 1060         case MOD_UNLOAD:
 1061                 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
 1062                      ++brandinfo)
 1063                         if (elf32_brand_inuse(*brandinfo))
 1064                                 error = EBUSY;
 1065                 if (error == 0) {
 1066                         for (brandinfo = &linux_brandlist[0];
 1067                              *brandinfo != NULL; ++brandinfo)
 1068                                 if (elf32_remove_brand_entry(*brandinfo) < 0)
 1069                                         error = EINVAL;
 1070                 }
 1071                 if (error == 0) {
 1072                         SET_FOREACH(lihp, linux_ioctl_handler_set)
 1073                                 linux_ioctl_unregister_handler(*lihp);
 1074                         mtx_destroy(&futex_mtx);
 1075                         EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag);
 1076                         EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag);
 1077                         EVENTHANDLER_DEREGISTER(thread_dtor, linux_thread_dtor_tag);
 1078                         linux_osd_jail_deregister();
 1079                         if (bootverbose)
 1080                                 printf("Linux ELF exec handler removed\n");
 1081                 } else
 1082                         printf("Could not deinstall ELF interpreter entry\n");
 1083                 break;
 1084         default:
 1085                 return (EOPNOTSUPP);
 1086         }
 1087         return (error);
 1088 }
 1089 
 1090 static moduledata_t linux_elf_mod = {
 1091         "linuxelf",
 1092         linux_elf_modevent,
 1093         0
 1094 };
 1095 
 1096 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
 1097 FEATURE(linux, "Linux 32bit support");

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