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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1994-1996 Søren Schmidt
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * 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 
   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 #include <machine/trap.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_ioctl.h>
   70 #include <compat/linux/linux_mib.h>
   71 #include <compat/linux/linux_misc.h>
   72 #include <compat/linux/linux_signal.h>
   73 #include <compat/linux/linux_util.h>
   74 #include <compat/linux/linux_vdso.h>
   75 
   76 MODULE_VERSION(linux, 1);
   77 
   78 #define LINUX_PS_STRINGS        (LINUX_USRSTACK - sizeof(struct ps_strings))
   79 
   80 static int linux_szsigcode;
   81 static vm_object_t linux_shared_page_obj;
   82 static char *linux_shared_page_mapping;
   83 extern char _binary_linux_locore_o_start;
   84 extern char _binary_linux_locore_o_end;
   85 
   86 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
   87 
   88 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
   89 
   90 static int      linux_fixup(uintptr_t *stack_base,
   91                     struct image_params *iparams);
   92 static int      linux_fixup_elf(uintptr_t *stack_base,
   93                     struct image_params *iparams);
   94 static void     linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
   95 static void     linux_exec_setregs(struct thread *td,
   96                     struct image_params *imgp, uintptr_t stack);
   97 static int      linux_copyout_strings(struct image_params *imgp,
   98                     uintptr_t *stack_base);
   99 static bool     linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
  100 static void     linux_vdso_install(void *param);
  101 static void     linux_vdso_deinstall(void *param);
  102 
  103 static int linux_szplatform;
  104 const char *linux_kplatform;
  105 
  106 #define LINUX_T_UNKNOWN  255
  107 static int _bsd_to_linux_trapcode[] = {
  108         LINUX_T_UNKNOWN,        /* 0 */
  109         6,                      /* 1  T_PRIVINFLT */
  110         LINUX_T_UNKNOWN,        /* 2 */
  111         3,                      /* 3  T_BPTFLT */
  112         LINUX_T_UNKNOWN,        /* 4 */
  113         LINUX_T_UNKNOWN,        /* 5 */
  114         16,                     /* 6  T_ARITHTRAP */
  115         254,                    /* 7  T_ASTFLT */
  116         LINUX_T_UNKNOWN,        /* 8 */
  117         13,                     /* 9  T_PROTFLT */
  118         1,                      /* 10 T_TRCTRAP */
  119         LINUX_T_UNKNOWN,        /* 11 */
  120         14,                     /* 12 T_PAGEFLT */
  121         LINUX_T_UNKNOWN,        /* 13 */
  122         17,                     /* 14 T_ALIGNFLT */
  123         LINUX_T_UNKNOWN,        /* 15 */
  124         LINUX_T_UNKNOWN,        /* 16 */
  125         LINUX_T_UNKNOWN,        /* 17 */
  126         0,                      /* 18 T_DIVIDE */
  127         2,                      /* 19 T_NMI */
  128         4,                      /* 20 T_OFLOW */
  129         5,                      /* 21 T_BOUND */
  130         7,                      /* 22 T_DNA */
  131         8,                      /* 23 T_DOUBLEFLT */
  132         9,                      /* 24 T_FPOPFLT */
  133         10,                     /* 25 T_TSSFLT */
  134         11,                     /* 26 T_SEGNPFLT */
  135         12,                     /* 27 T_STKFLT */
  136         18,                     /* 28 T_MCHK */
  137         19,                     /* 29 T_XMMFLT */
  138         15                      /* 30 T_RESERVED */
  139 };
  140 #define bsd_to_linux_trapcode(code) \
  141     ((code)<nitems(_bsd_to_linux_trapcode)? \
  142      _bsd_to_linux_trapcode[(code)]: \
  143      LINUX_T_UNKNOWN)
  144 
  145 LINUX_VDSO_SYM_INTPTR(linux_sigcode);
  146 LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode);
  147 LINUX_VDSO_SYM_INTPTR(linux_vsyscall);
  148 
  149 /*
  150  * If FreeBSD & Linux have a difference of opinion about what a trap
  151  * means, deal with it here.
  152  *
  153  * MPSAFE
  154  */
  155 static int
  156 linux_translate_traps(int signal, int trap_code)
  157 {
  158         if (signal != SIGBUS)
  159                 return (signal);
  160         switch (trap_code) {
  161         case T_PROTFLT:
  162         case T_TSSFLT:
  163         case T_DOUBLEFLT:
  164         case T_PAGEFLT:
  165                 return (SIGSEGV);
  166         default:
  167                 return (signal);
  168         }
  169 }
  170 
  171 static int
  172 linux_fixup(uintptr_t *stack_base, struct image_params *imgp)
  173 {
  174         register_t *base, *argv, *envp;
  175 
  176         base = (register_t *)*stack_base;
  177         argv = base;
  178         envp = base + (imgp->args->argc + 1);
  179         base--;
  180         suword(base, (intptr_t)envp);
  181         base--;
  182         suword(base, (intptr_t)argv);
  183         base--;
  184         suword(base, imgp->args->argc);
  185         *stack_base = (uintptr_t)base;
  186         return (0);
  187 }
  188 
  189 static int
  190 linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
  191 {
  192         struct proc *p;
  193         Elf32_Auxargs *args;
  194         Elf32_Auxinfo *argarray, *pos;
  195         Elf32_Addr *uplatform;
  196         struct ps_strings *arginfo;
  197         int error, issetugid;
  198 
  199         p = imgp->proc;
  200         issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
  201         arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
  202         uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform);
  203         args = (Elf32_Auxargs *)imgp->auxargs;
  204         argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
  205             M_WAITOK | M_ZERO);
  206 
  207         AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
  208             imgp->proc->p_sysent->sv_shared_page_base);
  209         AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux_vsyscall);
  210         AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
  211 
  212         /*
  213          * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0,
  214          * as it has appeared in the 2.4.0-rc7 first time.
  215          * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK),
  216          * glibc falls back to the hard-coded CLK_TCK value when aux entry
  217          * is not present.
  218          * Also see linux_times() implementation.
  219          */
  220         if (linux_kernver(curthread) >= LINUX_KERNVER_2004000)
  221                 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
  222         AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
  223         AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
  224         AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
  225         AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
  226         AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
  227         AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
  228         AUXARGS_ENTRY(pos, AT_BASE, args->base);
  229         AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
  230         AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
  231         AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
  232         AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
  233         AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
  234         AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(uplatform));
  235         AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary);
  236         if (imgp->execpathp != 0)
  237                 AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp);
  238         if (args->execfd != -1)
  239                 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
  240         AUXARGS_ENTRY(pos, AT_NULL, 0);
  241 
  242         free(imgp->auxargs, M_TEMP);
  243         imgp->auxargs = NULL;
  244         KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
  245 
  246         error = copyout(argarray, (void *)base,
  247             sizeof(*argarray) * LINUX_AT_COUNT);
  248         free(argarray, M_TEMP);
  249         return (error);
  250 }
  251 
  252 static int
  253 linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp)
  254 {
  255         register_t *base;
  256 
  257         base = (register_t *)*stack_base;
  258         base--;
  259         if (suword(base, (register_t)imgp->args->argc) == -1)
  260                 return (EFAULT);
  261         *stack_base = (uintptr_t)base;
  262         return (0);
  263 }
  264 
  265 /*
  266  * Copied from kern/kern_exec.c
  267  */
  268 static int
  269 linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
  270 {
  271         int argc, envc, error;
  272         char **vectp;
  273         char *stringp;
  274         uintptr_t destp, ustringp;
  275         struct ps_strings *arginfo;
  276         char canary[LINUX_AT_RANDOM_LEN];
  277         size_t execpath_len;
  278         struct proc *p;
  279 
  280         /* Calculate string base and vector table pointers. */
  281         p = imgp->proc;
  282         if (imgp->execpath != NULL && imgp->auxargs != NULL)
  283                 execpath_len = strlen(imgp->execpath) + 1;
  284         else
  285                 execpath_len = 0;
  286         arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
  287         destp = (uintptr_t)arginfo;
  288 
  289         /* Install LINUX_PLATFORM. */
  290         destp -= linux_szplatform;
  291         destp = rounddown2(destp, sizeof(void *));
  292         error = copyout(linux_kplatform, (void *)destp, linux_szplatform);
  293         if (error != 0)
  294                 return (error);
  295 
  296         if (execpath_len != 0) {
  297                 destp -= execpath_len;
  298                 destp = rounddown2(destp, sizeof(void *));
  299                 imgp->execpathp = (void *)destp;
  300                 error = copyout(imgp->execpath, imgp->execpathp, execpath_len);
  301                 if (error != 0)
  302                         return (error);
  303         }
  304 
  305         /* Prepare the canary for SSP. */
  306         arc4rand(canary, sizeof(canary), 0);
  307         destp -= roundup(sizeof(canary), sizeof(void *));
  308         imgp->canary = (void *)destp;
  309         error = copyout(canary, imgp->canary, sizeof(canary));
  310         if (error != 0)
  311                 return (error);
  312 
  313         /* Allocate room for the argument and environment strings. */
  314         destp -= ARG_MAX - imgp->args->stringspace;
  315         destp = rounddown2(destp, sizeof(void *));
  316         ustringp = destp;
  317 
  318         if (imgp->auxargs) {
  319                 /*
  320                  * Allocate room on the stack for the ELF auxargs
  321                  * array.  It has LINUX_AT_COUNT entries.
  322                  */
  323                 destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo);
  324                 destp = rounddown2(destp, sizeof(void *));
  325         }
  326 
  327         vectp = (char **)destp;
  328 
  329         /*
  330          * Allocate room for the argv[] and env vectors including the
  331          * terminating NULL pointers.
  332          */
  333         vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
  334 
  335         /* vectp also becomes our initial stack base. */
  336         *stack_base = (uintptr_t)vectp;
  337 
  338         stringp = imgp->args->begin_argv;
  339         argc = imgp->args->argc;
  340         envc = imgp->args->envc;
  341 
  342         /* Copy out strings - arguments and environment. */
  343         error = copyout(stringp, (void *)ustringp,
  344             ARG_MAX - imgp->args->stringspace);
  345         if (error != 0)
  346                 return (error);
  347 
  348         /* Fill in "ps_strings" struct for ps, w, etc. */
  349         if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 ||
  350             suword(&arginfo->ps_nargvstr, argc) != 0)
  351                 return (EFAULT);
  352 
  353         /* Fill in argument portion of vector table. */
  354         for (; argc > 0; --argc) {
  355                 if (suword(vectp++, ustringp) != 0)
  356                         return (EFAULT);
  357                 while (*stringp++ != 0)
  358                         ustringp++;
  359                 ustringp++;
  360         }
  361 
  362         /* A null vector table pointer separates the argp's from the envp's. */
  363         if (suword(vectp++, 0) != 0)
  364                 return (EFAULT);
  365 
  366         if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 ||
  367             suword(&arginfo->ps_nenvstr, envc) != 0)
  368                 return (EFAULT);
  369 
  370         /* Fill in environment portion of vector table. */
  371         for (; envc > 0; --envc) {
  372                 if (suword(vectp++, ustringp) != 0)
  373                         return (EFAULT);
  374                 while (*stringp++ != 0)
  375                         ustringp++;
  376                 ustringp++;
  377         }
  378 
  379         /* The end of the vector table is a null pointer. */
  380         if (suword(vectp, 0) != 0)
  381                 return (EFAULT);
  382 
  383         if (imgp->auxargs) {
  384                 vectp++;
  385                 error = imgp->sysent->sv_copyout_auxargs(imgp,
  386                     (uintptr_t)vectp);
  387                 if (error != 0)
  388                         return (error);
  389         }
  390 
  391         return (0);
  392 }
  393 
  394 static void
  395 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  396 {
  397         struct thread *td = curthread;
  398         struct proc *p = td->td_proc;
  399         struct sigacts *psp;
  400         struct trapframe *regs;
  401         struct l_rt_sigframe *fp, frame;
  402         int sig, code;
  403         int oonstack;
  404 
  405         sig = ksi->ksi_signo;
  406         code = ksi->ksi_code;
  407         PROC_LOCK_ASSERT(p, MA_OWNED);
  408         psp = p->p_sigacts;
  409         mtx_assert(&psp->ps_mtx, MA_OWNED);
  410         regs = td->td_frame;
  411         oonstack = sigonstack(regs->tf_esp);
  412 
  413         /* Allocate space for the signal handler context. */
  414         if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
  415             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  416                 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
  417                     td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
  418         } else
  419                 fp = (struct l_rt_sigframe *)regs->tf_esp - 1;
  420         mtx_unlock(&psp->ps_mtx);
  421 
  422         /* Build the argument list for the signal handler. */
  423         sig = bsd_to_linux_signal(sig);
  424 
  425         bzero(&frame, sizeof(frame));
  426 
  427         frame.sf_handler = catcher;
  428         frame.sf_sig = sig;
  429         frame.sf_siginfo = &fp->sf_si;
  430         frame.sf_ucontext = &fp->sf_sc;
  431 
  432         /* Fill in POSIX parts. */
  433         ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig);
  434 
  435         /* Build the signal context to be used by sigreturn. */
  436         frame.sf_sc.uc_flags = 0;               /* XXX ??? */
  437         frame.sf_sc.uc_link = NULL;             /* XXX ??? */
  438 
  439         frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp;
  440         frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
  441         frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
  442             ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
  443         PROC_UNLOCK(p);
  444 
  445         bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask);
  446 
  447         frame.sf_sc.uc_mcontext.sc_mask   = frame.sf_sc.uc_sigmask.__mask;
  448         frame.sf_sc.uc_mcontext.sc_gs     = rgs();
  449         frame.sf_sc.uc_mcontext.sc_fs     = regs->tf_fs;
  450         frame.sf_sc.uc_mcontext.sc_es     = regs->tf_es;
  451         frame.sf_sc.uc_mcontext.sc_ds     = regs->tf_ds;
  452         frame.sf_sc.uc_mcontext.sc_edi    = regs->tf_edi;
  453         frame.sf_sc.uc_mcontext.sc_esi    = regs->tf_esi;
  454         frame.sf_sc.uc_mcontext.sc_ebp    = regs->tf_ebp;
  455         frame.sf_sc.uc_mcontext.sc_ebx    = regs->tf_ebx;
  456         frame.sf_sc.uc_mcontext.sc_esp    = regs->tf_esp;
  457         frame.sf_sc.uc_mcontext.sc_edx    = regs->tf_edx;
  458         frame.sf_sc.uc_mcontext.sc_ecx    = regs->tf_ecx;
  459         frame.sf_sc.uc_mcontext.sc_eax    = regs->tf_eax;
  460         frame.sf_sc.uc_mcontext.sc_eip    = regs->tf_eip;
  461         frame.sf_sc.uc_mcontext.sc_cs     = regs->tf_cs;
  462         frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags;
  463         frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp;
  464         frame.sf_sc.uc_mcontext.sc_ss     = regs->tf_ss;
  465         frame.sf_sc.uc_mcontext.sc_err    = regs->tf_err;
  466         frame.sf_sc.uc_mcontext.sc_cr2    = (register_t)ksi->ksi_addr;
  467         frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
  468 
  469         if (copyout(&frame, fp, sizeof(frame)) != 0) {
  470                 /*
  471                  * Process has trashed its stack; give it an illegal
  472                  * instruction to halt it in its tracks.
  473                  */
  474                 PROC_LOCK(p);
  475                 sigexit(td, SIGILL);
  476         }
  477 
  478         /* Build context to run handler in. */
  479         regs->tf_esp = (int)fp;
  480         regs->tf_eip = linux_rt_sigcode;
  481         regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D);
  482         regs->tf_cs = _ucodesel;
  483         regs->tf_ds = _udatasel;
  484         regs->tf_es = _udatasel;
  485         regs->tf_fs = _udatasel;
  486         regs->tf_ss = _udatasel;
  487         PROC_LOCK(p);
  488         mtx_lock(&psp->ps_mtx);
  489 }
  490 
  491 /*
  492  * Send an interrupt to process.
  493  *
  494  * Stack is set up to allow sigcode stored
  495  * in u. to call routine, followed by kcall
  496  * to sigreturn routine below.  After sigreturn
  497  * resets the signal mask, the stack, and the
  498  * frame pointer, it returns to the user
  499  * specified pc, psl.
  500  */
  501 static void
  502 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  503 {
  504         struct thread *td = curthread;
  505         struct proc *p = td->td_proc;
  506         struct sigacts *psp;
  507         struct trapframe *regs;
  508         struct l_sigframe *fp, frame;
  509         l_sigset_t lmask;
  510         int sig, code;
  511         int oonstack;
  512 
  513         PROC_LOCK_ASSERT(p, MA_OWNED);
  514         psp = p->p_sigacts;
  515         sig = ksi->ksi_signo;
  516         code = ksi->ksi_code;
  517         mtx_assert(&psp->ps_mtx, MA_OWNED);
  518         if (SIGISMEMBER(psp->ps_siginfo, sig)) {
  519                 /* Signal handler installed with SA_SIGINFO. */
  520                 linux_rt_sendsig(catcher, ksi, mask);
  521                 return;
  522         }
  523         regs = td->td_frame;
  524         oonstack = sigonstack(regs->tf_esp);
  525 
  526         /* Allocate space for the signal handler context. */
  527         if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
  528             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  529                 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
  530                     td->td_sigstk.ss_size - sizeof(struct l_sigframe));
  531         } else
  532                 fp = (struct l_sigframe *)regs->tf_esp - 1;
  533         mtx_unlock(&psp->ps_mtx);
  534         PROC_UNLOCK(p);
  535 
  536         /* Build the argument list for the signal handler. */
  537         sig = bsd_to_linux_signal(sig);
  538 
  539         bzero(&frame, sizeof(frame));
  540 
  541         frame.sf_handler = catcher;
  542         frame.sf_sig = sig;
  543 
  544         bsd_to_linux_sigset(mask, &lmask);
  545 
  546         /* Build the signal context to be used by sigreturn. */
  547         frame.sf_sc.sc_mask   = lmask.__mask;
  548         frame.sf_sc.sc_gs     = rgs();
  549         frame.sf_sc.sc_fs     = regs->tf_fs;
  550         frame.sf_sc.sc_es     = regs->tf_es;
  551         frame.sf_sc.sc_ds     = regs->tf_ds;
  552         frame.sf_sc.sc_edi    = regs->tf_edi;
  553         frame.sf_sc.sc_esi    = regs->tf_esi;
  554         frame.sf_sc.sc_ebp    = regs->tf_ebp;
  555         frame.sf_sc.sc_ebx    = regs->tf_ebx;
  556         frame.sf_sc.sc_esp    = regs->tf_esp;
  557         frame.sf_sc.sc_edx    = regs->tf_edx;
  558         frame.sf_sc.sc_ecx    = regs->tf_ecx;
  559         frame.sf_sc.sc_eax    = regs->tf_eax;
  560         frame.sf_sc.sc_eip    = regs->tf_eip;
  561         frame.sf_sc.sc_cs     = regs->tf_cs;
  562         frame.sf_sc.sc_eflags = regs->tf_eflags;
  563         frame.sf_sc.sc_esp_at_signal = regs->tf_esp;
  564         frame.sf_sc.sc_ss     = regs->tf_ss;
  565         frame.sf_sc.sc_err    = regs->tf_err;
  566         frame.sf_sc.sc_cr2    = (register_t)ksi->ksi_addr;
  567         frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno);
  568 
  569         frame.sf_extramask[0] = lmask.__mask;
  570 
  571         if (copyout(&frame, fp, sizeof(frame)) != 0) {
  572                 /*
  573                  * Process has trashed its stack; give it an illegal
  574                  * instruction to halt it in its tracks.
  575                  */
  576                 PROC_LOCK(p);
  577                 sigexit(td, SIGILL);
  578         }
  579 
  580         /* Build context to run handler in. */
  581         regs->tf_esp = (int)fp;
  582         regs->tf_eip = linux_sigcode;
  583         regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D);
  584         regs->tf_cs = _ucodesel;
  585         regs->tf_ds = _udatasel;
  586         regs->tf_es = _udatasel;
  587         regs->tf_fs = _udatasel;
  588         regs->tf_ss = _udatasel;
  589         PROC_LOCK(p);
  590         mtx_lock(&psp->ps_mtx);
  591 }
  592 
  593 /*
  594  * System call to cleanup state after a signal
  595  * has been taken.  Reset signal mask and
  596  * stack state from context left by sendsig (above).
  597  * Return to previous pc and psl as specified by
  598  * context left by sendsig. Check carefully to
  599  * make sure that the user has not modified the
  600  * psl to gain improper privileges or to cause
  601  * a machine fault.
  602  */
  603 int
  604 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
  605 {
  606         struct l_sigframe frame;
  607         struct trapframe *regs;
  608         l_sigset_t lmask;
  609         sigset_t bmask;
  610         int eflags;
  611         ksiginfo_t ksi;
  612 
  613         regs = td->td_frame;
  614 
  615         /*
  616          * The trampoline code hands us the sigframe.
  617          * It is unsafe to keep track of it ourselves, in the event that a
  618          * program jumps out of a signal handler.
  619          */
  620         if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
  621                 return (EFAULT);
  622 
  623         /* Check for security violations. */
  624 #define EFLAGS_SECURE(ef, oef)  ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
  625         eflags = frame.sf_sc.sc_eflags;
  626         if (!EFLAGS_SECURE(eflags, regs->tf_eflags))
  627                 return (EINVAL);
  628 
  629         /*
  630          * Don't allow users to load a valid privileged %cs.  Let the
  631          * hardware check for invalid selectors, excess privilege in
  632          * other selectors, invalid %eip's and invalid %esp's.
  633          */
  634 #define CS_SECURE(cs)   (ISPL(cs) == SEL_UPL)
  635         if (!CS_SECURE(frame.sf_sc.sc_cs)) {
  636                 ksiginfo_init_trap(&ksi);
  637                 ksi.ksi_signo = SIGBUS;
  638                 ksi.ksi_code = BUS_OBJERR;
  639                 ksi.ksi_trapno = T_PROTFLT;
  640                 ksi.ksi_addr = (void *)regs->tf_eip;
  641                 trapsignal(td, &ksi);
  642                 return (EINVAL);
  643         }
  644 
  645         lmask.__mask = frame.sf_sc.sc_mask;
  646         linux_to_bsd_sigset(&lmask, &bmask);
  647         kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
  648 
  649         /* Restore signal context. */
  650         /* %gs was restored by the trampoline. */
  651         regs->tf_fs     = frame.sf_sc.sc_fs;
  652         regs->tf_es     = frame.sf_sc.sc_es;
  653         regs->tf_ds     = frame.sf_sc.sc_ds;
  654         regs->tf_edi    = frame.sf_sc.sc_edi;
  655         regs->tf_esi    = frame.sf_sc.sc_esi;
  656         regs->tf_ebp    = frame.sf_sc.sc_ebp;
  657         regs->tf_ebx    = frame.sf_sc.sc_ebx;
  658         regs->tf_edx    = frame.sf_sc.sc_edx;
  659         regs->tf_ecx    = frame.sf_sc.sc_ecx;
  660         regs->tf_eax    = frame.sf_sc.sc_eax;
  661         regs->tf_eip    = frame.sf_sc.sc_eip;
  662         regs->tf_cs     = frame.sf_sc.sc_cs;
  663         regs->tf_eflags = eflags;
  664         regs->tf_esp    = frame.sf_sc.sc_esp_at_signal;
  665         regs->tf_ss     = frame.sf_sc.sc_ss;
  666 
  667         return (EJUSTRETURN);
  668 }
  669 
  670 /*
  671  * System call to cleanup state after a signal
  672  * has been taken.  Reset signal mask and
  673  * stack state from context left by rt_sendsig (above).
  674  * Return to previous pc and psl as specified by
  675  * context left by sendsig. Check carefully to
  676  * make sure that the user has not modified the
  677  * psl to gain improper privileges or to cause
  678  * a machine fault.
  679  */
  680 int
  681 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
  682 {
  683         struct l_ucontext uc;
  684         struct l_sigcontext *context;
  685         sigset_t bmask;
  686         l_stack_t *lss;
  687         stack_t ss;
  688         struct trapframe *regs;
  689         int eflags;
  690         ksiginfo_t ksi;
  691 
  692         regs = td->td_frame;
  693 
  694         /*
  695          * The trampoline code hands us the ucontext.
  696          * It is unsafe to keep track of it ourselves, in the event that a
  697          * program jumps out of a signal handler.
  698          */
  699         if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
  700                 return (EFAULT);
  701 
  702         context = &uc.uc_mcontext;
  703 
  704         /* Check for security violations. */
  705 #define EFLAGS_SECURE(ef, oef)  ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
  706         eflags = context->sc_eflags;
  707         if (!EFLAGS_SECURE(eflags, regs->tf_eflags))
  708                 return (EINVAL);
  709 
  710         /*
  711          * Don't allow users to load a valid privileged %cs.  Let the
  712          * hardware check for invalid selectors, excess privilege in
  713          * other selectors, invalid %eip's and invalid %esp's.
  714          */
  715 #define CS_SECURE(cs)   (ISPL(cs) == SEL_UPL)
  716         if (!CS_SECURE(context->sc_cs)) {
  717                 ksiginfo_init_trap(&ksi);
  718                 ksi.ksi_signo = SIGBUS;
  719                 ksi.ksi_code = BUS_OBJERR;
  720                 ksi.ksi_trapno = T_PROTFLT;
  721                 ksi.ksi_addr = (void *)regs->tf_eip;
  722                 trapsignal(td, &ksi);
  723                 return (EINVAL);
  724         }
  725 
  726         linux_to_bsd_sigset(&uc.uc_sigmask, &bmask);
  727         kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
  728 
  729         /* Restore signal context. */
  730         /* %gs was restored by the trampoline. */
  731         regs->tf_fs     = context->sc_fs;
  732         regs->tf_es     = context->sc_es;
  733         regs->tf_ds     = context->sc_ds;
  734         regs->tf_edi    = context->sc_edi;
  735         regs->tf_esi    = context->sc_esi;
  736         regs->tf_ebp    = context->sc_ebp;
  737         regs->tf_ebx    = context->sc_ebx;
  738         regs->tf_edx    = context->sc_edx;
  739         regs->tf_ecx    = context->sc_ecx;
  740         regs->tf_eax    = context->sc_eax;
  741         regs->tf_eip    = context->sc_eip;
  742         regs->tf_cs     = context->sc_cs;
  743         regs->tf_eflags = eflags;
  744         regs->tf_esp    = context->sc_esp_at_signal;
  745         regs->tf_ss     = context->sc_ss;
  746 
  747         /* Call sigaltstack & ignore results. */
  748         lss = &uc.uc_stack;
  749         ss.ss_sp = lss->ss_sp;
  750         ss.ss_size = lss->ss_size;
  751         ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
  752 
  753         (void)kern_sigaltstack(td, &ss, NULL);
  754 
  755         return (EJUSTRETURN);
  756 }
  757 
  758 static int
  759 linux_fetch_syscall_args(struct thread *td)
  760 {
  761         struct proc *p;
  762         struct trapframe *frame;
  763         struct syscall_args *sa;
  764 
  765         p = td->td_proc;
  766         frame = td->td_frame;
  767         sa = &td->td_sa;
  768 
  769         sa->code = frame->tf_eax;
  770         sa->args[0] = frame->tf_ebx;
  771         sa->args[1] = frame->tf_ecx;
  772         sa->args[2] = frame->tf_edx;
  773         sa->args[3] = frame->tf_esi;
  774         sa->args[4] = frame->tf_edi;
  775         sa->args[5] = frame->tf_ebp;    /* Unconfirmed */
  776 
  777         if (sa->code >= p->p_sysent->sv_size)
  778                 /* nosys */
  779                 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1];
  780         else
  781                 sa->callp = &p->p_sysent->sv_table[sa->code];
  782 
  783         td->td_retval[0] = 0;
  784         td->td_retval[1] = frame->tf_edx;
  785 
  786         return (0);
  787 }
  788 
  789 static void
  790 linux_set_syscall_retval(struct thread *td, int error)
  791 {
  792         struct trapframe *frame = td->td_frame;
  793 
  794         cpu_set_syscall_retval(td, error);
  795 
  796         if (__predict_false(error != 0)) {
  797                 if (error != ERESTART && error != EJUSTRETURN)
  798                         frame->tf_eax = bsd_to_linux_errno(error);
  799         }
  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,
  809     uintptr_t stack)
  810 {
  811         struct pcb *pcb = td->td_pcb;
  812 
  813         exec_setregs(td, imgp, stack);
  814 
  815         /* Linux sets %gs to 0, we default to _udatasel. */
  816         pcb->pcb_gs = 0;
  817         load_gs(0);
  818 
  819         pcb->pcb_initial_npxcw = __LINUX_NPXCW__;
  820 }
  821 
  822 static void
  823 linux_get_machine(const char **dst)
  824 {
  825 
  826         switch (cpu_class) {
  827         case CPUCLASS_686:
  828                 *dst = "i686";
  829                 break;
  830         case CPUCLASS_586:
  831                 *dst = "i586";
  832                 break;
  833         case CPUCLASS_486:
  834                 *dst = "i486";
  835                 break;
  836         default:
  837                 *dst = "i386";
  838         }
  839 }
  840 
  841 struct sysentvec linux_sysvec = {
  842         .sv_size        = LINUX_SYS_MAXSYSCALL,
  843         .sv_table       = linux_sysent,
  844         .sv_transtrap   = linux_translate_traps,
  845         .sv_fixup       = linux_fixup,
  846         .sv_sendsig     = linux_sendsig,
  847         .sv_sigcode     = &_binary_linux_locore_o_start,
  848         .sv_szsigcode   = &linux_szsigcode,
  849         .sv_name        = "Linux a.out",
  850         .sv_coredump    = NULL,
  851         .sv_imgact_try  = linux_exec_imgact_try,
  852         .sv_minsigstksz = LINUX_MINSIGSTKSZ,
  853         .sv_minuser     = VM_MIN_ADDRESS,
  854         .sv_maxuser     = VM_MAXUSER_ADDRESS,
  855         .sv_usrstack    = LINUX_USRSTACK,
  856         .sv_psstrings   = PS_STRINGS,
  857         .sv_stackprot   = VM_PROT_ALL,
  858         .sv_copyout_strings = exec_copyout_strings,
  859         .sv_setregs     = linux_exec_setregs,
  860         .sv_fixlimit    = NULL,
  861         .sv_maxssiz     = NULL,
  862         .sv_flags       = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32 |
  863             SV_SIG_DISCIGN | SV_SIG_WAITNDQ,
  864         .sv_set_syscall_retval = linux_set_syscall_retval,
  865         .sv_fetch_syscall_args = linux_fetch_syscall_args,
  866         .sv_syscallnames = NULL,
  867         .sv_shared_page_base = LINUX_SHAREDPAGE,
  868         .sv_shared_page_len = PAGE_SIZE,
  869         .sv_schedtail   = linux_schedtail,
  870         .sv_thread_detach = linux_thread_detach,
  871         .sv_trap        = NULL,
  872         .sv_onexec      = linux_on_exec,
  873         .sv_onexit      = linux_on_exit,
  874         .sv_ontdexit    = linux_thread_dtor,
  875         .sv_setid_allowed = &linux_setid_allowed_query,
  876 };
  877 INIT_SYSENTVEC(aout_sysvec, &linux_sysvec);
  878 
  879 struct sysentvec elf_linux_sysvec = {
  880         .sv_size        = LINUX_SYS_MAXSYSCALL,
  881         .sv_table       = linux_sysent,
  882         .sv_transtrap   = linux_translate_traps,
  883         .sv_fixup       = linux_fixup_elf,
  884         .sv_sendsig     = linux_sendsig,
  885         .sv_sigcode     = &_binary_linux_locore_o_start,
  886         .sv_szsigcode   = &linux_szsigcode,
  887         .sv_name        = "Linux ELF32",
  888         .sv_coredump    = elf32_coredump,
  889         .sv_imgact_try  = linux_exec_imgact_try,
  890         .sv_minsigstksz = LINUX_MINSIGSTKSZ,
  891         .sv_minuser     = VM_MIN_ADDRESS,
  892         .sv_maxuser     = VM_MAXUSER_ADDRESS,
  893         .sv_usrstack    = LINUX_USRSTACK,
  894         .sv_psstrings   = LINUX_PS_STRINGS,
  895         .sv_stackprot   = VM_PROT_ALL,
  896         .sv_copyout_auxargs = linux_copyout_auxargs,
  897         .sv_copyout_strings = linux_copyout_strings,
  898         .sv_setregs     = linux_exec_setregs,
  899         .sv_fixlimit    = NULL,
  900         .sv_maxssiz     = NULL,
  901         .sv_flags       = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP |
  902             SV_SIG_DISCIGN | SV_SIG_WAITNDQ,
  903         .sv_set_syscall_retval = linux_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         .sv_onexec      = linux_on_exec,
  912         .sv_onexit      = linux_on_exit,
  913         .sv_ontdexit    = linux_thread_dtor,
  914         .sv_setid_allowed = &linux_setid_allowed_query,
  915 };
  916 
  917 static void
  918 linux_vdso_install(void *param)
  919 {
  920 
  921         linux_szsigcode = (&_binary_linux_locore_o_end -
  922             &_binary_linux_locore_o_start);
  923 
  924         if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
  925                 panic("Linux invalid vdso size\n");
  926 
  927         __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
  928 
  929         linux_shared_page_obj = __elfN(linux_shared_page_init)
  930             (&linux_shared_page_mapping);
  931 
  932         __elfN(linux_vdso_reloc)(&elf_linux_sysvec);
  933 
  934         bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
  935             linux_szsigcode);
  936         elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
  937 }
  938 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
  939     linux_vdso_install, NULL);
  940 
  941 static void
  942 linux_vdso_deinstall(void *param)
  943 {
  944 
  945         __elfN(linux_shared_page_fini)(linux_shared_page_obj,
  946             linux_shared_page_mapping);
  947 }
  948 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
  949     linux_vdso_deinstall, NULL);
  950 
  951 static char GNU_ABI_VENDOR[] = "GNU";
  952 static int GNULINUX_ABI_DESC = 0;
  953 
  954 static bool
  955 linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
  956 {
  957         const Elf32_Word *desc;
  958         uintptr_t p;
  959 
  960         p = (uintptr_t)(note + 1);
  961         p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
  962 
  963         desc = (const Elf32_Word *)p;
  964         if (desc[0] != GNULINUX_ABI_DESC)
  965                 return (false);
  966 
  967         /*
  968          * For Linux we encode osrel using the Linux convention of
  969          *      (version << 16) | (major << 8) | (minor)
  970          * See macro in linux_mib.h
  971          */
  972         *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]);
  973 
  974         return (true);
  975 }
  976 
  977 static Elf_Brandnote linux_brandnote = {
  978         .hdr.n_namesz   = sizeof(GNU_ABI_VENDOR),
  979         .hdr.n_descsz   = 16,   /* XXX at least 16 */
  980         .hdr.n_type     = 1,
  981         .vendor         = GNU_ABI_VENDOR,
  982         .flags          = BN_TRANSLATE_OSREL,
  983         .trans_osrel    = linux_trans_osrel
  984 };
  985 
  986 static Elf32_Brandinfo linux_brand = {
  987         .brand          = ELFOSABI_LINUX,
  988         .machine        = EM_386,
  989         .compat_3_brand = "Linux",
  990         .emul_path      = linux_emul_path,
  991         .interp_path    = "/lib/ld-linux.so.1",
  992         .sysvec         = &elf_linux_sysvec,
  993         .interp_newpath = NULL,
  994         .brand_note     = &linux_brandnote,
  995         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  996 };
  997 
  998 static Elf32_Brandinfo linux_glibc2brand = {
  999         .brand          = ELFOSABI_LINUX,
 1000         .machine        = EM_386,
 1001         .compat_3_brand = "Linux",
 1002         .emul_path      = linux_emul_path,
 1003         .interp_path    = "/lib/ld-linux.so.2",
 1004         .sysvec         = &elf_linux_sysvec,
 1005         .interp_newpath = NULL,
 1006         .brand_note     = &linux_brandnote,
 1007         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 1008 };
 1009 
 1010 static Elf32_Brandinfo linux_muslbrand = {
 1011         .brand          = ELFOSABI_LINUX,
 1012         .machine        = EM_386,
 1013         .compat_3_brand = "Linux",
 1014         .emul_path      = linux_emul_path,
 1015         .interp_path    = "/lib/ld-musl-i386.so.1",
 1016         .sysvec         = &elf_linux_sysvec,
 1017         .interp_newpath = NULL,
 1018         .brand_note     = &linux_brandnote,
 1019         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 1020 };
 1021 
 1022 Elf32_Brandinfo *linux_brandlist[] = {
 1023         &linux_brand,
 1024         &linux_glibc2brand,
 1025         &linux_muslbrand,
 1026         NULL
 1027 };
 1028 
 1029 static int
 1030 linux_elf_modevent(module_t mod, int type, void *data)
 1031 {
 1032         Elf32_Brandinfo **brandinfo;
 1033         int error;
 1034         struct linux_ioctl_handler **lihp;
 1035 
 1036         error = 0;
 1037 
 1038         switch(type) {
 1039         case MOD_LOAD:
 1040                 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
 1041                      ++brandinfo)
 1042                         if (elf32_insert_brand_entry(*brandinfo) < 0)
 1043                                 error = EINVAL;
 1044                 if (error == 0) {
 1045                         SET_FOREACH(lihp, linux_ioctl_handler_set)
 1046                                 linux_ioctl_register_handler(*lihp);
 1047                         LIST_INIT(&futex_list);
 1048                         mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF);
 1049                         linux_get_machine(&linux_kplatform);
 1050                         linux_szplatform = roundup(strlen(linux_kplatform) + 1,
 1051                             sizeof(char *));
 1052                         linux_dev_shm_create();
 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                         linux_dev_shm_destroy();
 1076                         linux_osd_jail_deregister();
 1077                         if (bootverbose)
 1078                                 printf("Linux ELF exec handler removed\n");
 1079                 } else
 1080                         printf("Could not deinstall ELF interpreter entry\n");
 1081                 break;
 1082         default:
 1083                 return (EOPNOTSUPP);
 1084         }
 1085         return (error);
 1086 }
 1087 
 1088 static moduledata_t linux_elf_mod = {
 1089         "linuxelf",
 1090         linux_elf_modevent,
 1091         0
 1092 };
 1093 
 1094 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
 1095 FEATURE(linux, "Linux 32bit support");

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