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/malloc.h>
   41 #include <sys/module.h>
   42 #include <sys/proc.h>
   43 #include <sys/stddef.h>
   44 #include <sys/signalvar.h>
   45 #include <sys/syscallsubr.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/sysent.h>
   48 #include <sys/sysproto.h>
   49 #include <sys/vnode.h>
   50 
   51 #include <vm/vm.h>
   52 #include <vm/pmap.h>
   53 #include <vm/vm_extern.h>
   54 #include <vm/vm_map.h>
   55 #include <vm/vm_object.h>
   56 #include <vm/vm_page.h>
   57 #include <vm/vm_param.h>
   58 
   59 #include <machine/cpu.h>
   60 #include <machine/cputypes.h>
   61 #include <machine/md_var.h>
   62 #include <machine/pcb.h>
   63 #include <machine/trap.h>
   64 
   65 #include <x86/linux/linux_x86.h>
   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_fork.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 #include <x86/linux/linux_x86_sigframe.h>
   78 
   79 MODULE_VERSION(linux, 1);
   80 
   81 #define LINUX_VDSOPAGE_SIZE     PAGE_SIZE * 2
   82 #define LINUX_VDSOPAGE          (VM_MAXUSER_ADDRESS - LINUX_VDSOPAGE_SIZE)
   83 #define LINUX_SHAREDPAGE        (LINUX_VDSOPAGE - PAGE_SIZE)
   84                                 /*
   85                                  * PAGE_SIZE - the size
   86                                  * of the native SHAREDPAGE
   87                                  */
   88 #define LINUX_USRSTACK          LINUX_SHAREDPAGE
   89 #define LINUX_PS_STRINGS        (LINUX_USRSTACK - sizeof(struct ps_strings))
   90 
   91 static int linux_szsigcode;
   92 static vm_object_t linux_vdso_obj;
   93 static char *linux_vdso_mapping;
   94 extern char _binary_linux_vdso_so_o_start;
   95 extern char _binary_linux_vdso_so_o_end;
   96 static vm_offset_t linux_vdso_base;
   97 
   98 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
   99 extern const char *linux_syscallnames[];
  100 
  101 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
  102 
  103 static int      linux_fixup(uintptr_t *stack_base,
  104                     struct image_params *iparams);
  105 static int      linux_fixup_elf(uintptr_t *stack_base,
  106                     struct image_params *iparams);
  107 static void     linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
  108 static void     linux_exec_setregs(struct thread *td,
  109                     struct image_params *imgp, uintptr_t stack);
  110 static void     linux_exec_sysvec_init(void *param);
  111 static int      linux_on_exec_vmspace(struct proc *p,
  112                     struct image_params *imgp);
  113 static int      linux_copyout_strings(struct image_params *imgp,
  114                     uintptr_t *stack_base);
  115 static void     linux_set_fork_retval(struct thread *td);
  116 static bool     linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
  117 static void     linux_vdso_install(const void *param);
  118 static void     linux_vdso_deinstall(const void *param);
  119 static void     linux_vdso_reloc(char *mapping, Elf_Addr offset);
  120 
  121 LINUX_VDSO_SYM_CHAR(linux_platform);
  122 LINUX_VDSO_SYM_INTPTR(__kernel_vsyscall);
  123 LINUX_VDSO_SYM_INTPTR(linux_vdso_sigcode);
  124 LINUX_VDSO_SYM_INTPTR(linux_vdso_rt_sigcode);
  125 LINUX_VDSO_SYM_INTPTR(kern_timekeep_base);
  126 LINUX_VDSO_SYM_INTPTR(kern_tsc_selector);
  127 LINUX_VDSO_SYM_INTPTR(kern_cpu_selector);
  128 
  129 static int
  130 linux_fixup(uintptr_t *stack_base, struct image_params *imgp)
  131 {
  132         register_t *base, *argv, *envp;
  133 
  134         base = (register_t *)*stack_base;
  135         argv = base;
  136         envp = base + (imgp->args->argc + 1);
  137         base--;
  138         suword(base, (intptr_t)envp);
  139         base--;
  140         suword(base, (intptr_t)argv);
  141         base--;
  142         suword(base, imgp->args->argc);
  143         *stack_base = (uintptr_t)base;
  144         return (0);
  145 }
  146 
  147 static int
  148 linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
  149 {
  150         Elf32_Auxargs *args;
  151         Elf32_Auxinfo *argarray, *pos;
  152         int error, issetugid;
  153 
  154         issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
  155         args = (Elf32_Auxargs *)imgp->auxargs;
  156         argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
  157             M_WAITOK | M_ZERO);
  158 
  159         AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
  160         AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, __kernel_vsyscall);
  161         AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
  162 
  163         /*
  164          * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0,
  165          * as it has appeared in the 2.4.0-rc7 first time.
  166          * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK),
  167          * glibc falls back to the hard-coded CLK_TCK value when aux entry
  168          * is not present.
  169          * Also see linux_times() implementation.
  170          */
  171         if (linux_kernver(curthread) >= LINUX_KERNVER_2004000)
  172                 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
  173         AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
  174         AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
  175         AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
  176         AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
  177         AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
  178         AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
  179         AUXARGS_ENTRY(pos, AT_BASE, args->base);
  180         AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
  181         AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
  182         AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
  183         AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
  184         AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
  185         AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
  186         AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary);
  187         if (imgp->execpathp != 0)
  188                 AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp);
  189         if (args->execfd != -1)
  190                 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
  191         AUXARGS_ENTRY(pos, AT_NULL, 0);
  192 
  193         free(imgp->auxargs, M_TEMP);
  194         imgp->auxargs = NULL;
  195         KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
  196 
  197         error = copyout(argarray, (void *)base,
  198             sizeof(*argarray) * LINUX_AT_COUNT);
  199         free(argarray, M_TEMP);
  200         return (error);
  201 }
  202 
  203 static int
  204 linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp)
  205 {
  206         register_t *base;
  207 
  208         base = (register_t *)*stack_base;
  209         base--;
  210         if (suword(base, (register_t)imgp->args->argc) == -1)
  211                 return (EFAULT);
  212         *stack_base = (uintptr_t)base;
  213         return (0);
  214 }
  215 
  216 /*
  217  * Copied from kern/kern_exec.c
  218  */
  219 static int
  220 linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
  221 {
  222         int argc, envc, error;
  223         char **vectp;
  224         char *stringp;
  225         uintptr_t destp, ustringp;
  226         struct ps_strings *arginfo;
  227         char canary[LINUX_AT_RANDOM_LEN];
  228         size_t execpath_len;
  229         struct proc *p;
  230 
  231         p = imgp->proc;
  232         arginfo = (struct ps_strings *)PROC_PS_STRINGS(p);
  233         destp = (uintptr_t)arginfo;
  234 
  235         if (imgp->execpath != NULL && imgp->auxargs != NULL) {
  236                 execpath_len = strlen(imgp->execpath) + 1;
  237                 destp -= execpath_len;
  238                 destp = rounddown2(destp, sizeof(void *));
  239                 imgp->execpathp = (void *)destp;
  240                 error = copyout(imgp->execpath, imgp->execpathp, execpath_len);
  241                 if (error != 0)
  242                         return (error);
  243         }
  244 
  245         /* Prepare the canary for SSP. */
  246         arc4rand(canary, sizeof(canary), 0);
  247         destp -= roundup(sizeof(canary), sizeof(void *));
  248         imgp->canary = (void *)destp;
  249         error = copyout(canary, imgp->canary, sizeof(canary));
  250         if (error != 0)
  251                 return (error);
  252 
  253         /* Allocate room for the argument and environment strings. */
  254         destp -= ARG_MAX - imgp->args->stringspace;
  255         destp = rounddown2(destp, sizeof(void *));
  256         ustringp = destp;
  257 
  258         if (imgp->auxargs) {
  259                 /*
  260                  * Allocate room on the stack for the ELF auxargs
  261                  * array.  It has LINUX_AT_COUNT entries.
  262                  */
  263                 destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo);
  264                 destp = rounddown2(destp, sizeof(void *));
  265         }
  266 
  267         vectp = (char **)destp;
  268 
  269         /*
  270          * Allocate room for the argv[] and env vectors including the
  271          * terminating NULL pointers.
  272          */
  273         vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
  274 
  275         /* vectp also becomes our initial stack base. */
  276         *stack_base = (uintptr_t)vectp;
  277 
  278         stringp = imgp->args->begin_argv;
  279         argc = imgp->args->argc;
  280         envc = imgp->args->envc;
  281 
  282         /* Copy out strings - arguments and environment. */
  283         error = copyout(stringp, (void *)ustringp,
  284             ARG_MAX - imgp->args->stringspace);
  285         if (error != 0)
  286                 return (error);
  287 
  288         /* Fill in "ps_strings" struct for ps, w, etc. */
  289         if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 ||
  290             suword(&arginfo->ps_nargvstr, argc) != 0)
  291                 return (EFAULT);
  292 
  293         /* Fill in argument portion of vector table. */
  294         for (; argc > 0; --argc) {
  295                 if (suword(vectp++, ustringp) != 0)
  296                         return (EFAULT);
  297                 while (*stringp++ != 0)
  298                         ustringp++;
  299                 ustringp++;
  300         }
  301 
  302         /* A null vector table pointer separates the argp's from the envp's. */
  303         if (suword(vectp++, 0) != 0)
  304                 return (EFAULT);
  305 
  306         if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 ||
  307             suword(&arginfo->ps_nenvstr, envc) != 0)
  308                 return (EFAULT);
  309 
  310         /* Fill in environment portion of vector table. */
  311         for (; envc > 0; --envc) {
  312                 if (suword(vectp++, ustringp) != 0)
  313                         return (EFAULT);
  314                 while (*stringp++ != 0)
  315                         ustringp++;
  316                 ustringp++;
  317         }
  318 
  319         /* The end of the vector table is a null pointer. */
  320         if (suword(vectp, 0) != 0)
  321                 return (EFAULT);
  322 
  323         if (imgp->auxargs) {
  324                 vectp++;
  325                 error = imgp->sysent->sv_copyout_auxargs(imgp,
  326                     (uintptr_t)vectp);
  327                 if (error != 0)
  328                         return (error);
  329         }
  330 
  331         return (0);
  332 }
  333 
  334 static void
  335 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  336 {
  337         struct thread *td = curthread;
  338         struct proc *p = td->td_proc;
  339         struct sigacts *psp;
  340         struct trapframe *regs;
  341         struct l_rt_sigframe *fp, frame;
  342         int sig, code;
  343         int oonstack;
  344 
  345         sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno);
  346         code = ksi->ksi_code;
  347         PROC_LOCK_ASSERT(p, MA_OWNED);
  348         psp = p->p_sigacts;
  349         mtx_assert(&psp->ps_mtx, MA_OWNED);
  350         regs = td->td_frame;
  351         oonstack = sigonstack(regs->tf_esp);
  352 
  353         /* Allocate space for the signal handler context. */
  354         if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
  355             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  356                 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
  357                     td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
  358         } else
  359                 fp = (struct l_rt_sigframe *)regs->tf_esp - 1;
  360         mtx_unlock(&psp->ps_mtx);
  361 
  362         /* Build the argument list for the signal handler. */
  363         sig = bsd_to_linux_signal(sig);
  364 
  365         bzero(&frame, sizeof(frame));
  366 
  367         frame.sf_sig = sig;
  368         frame.sf_siginfo = PTROUT(&fp->sf_si);
  369         frame.sf_ucontext = PTROUT(&fp->sf_uc);
  370 
  371         /* Fill in POSIX parts. */
  372         siginfo_to_lsiginfo(&ksi->ksi_info, &frame.sf_si, sig);
  373 
  374         /* Build the signal context to be used by sigreturn. */
  375         frame.sf_uc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
  376         frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
  377         frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
  378             ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
  379         PROC_UNLOCK(p);
  380 
  381         bsd_to_linux_sigset(mask, &frame.sf_uc.uc_sigmask);
  382 
  383         frame.sf_uc.uc_mcontext.sc_mask   = frame.sf_uc.uc_sigmask.__mask;
  384         frame.sf_uc.uc_mcontext.sc_gs     = rgs();
  385         frame.sf_uc.uc_mcontext.sc_fs     = regs->tf_fs;
  386         frame.sf_uc.uc_mcontext.sc_es     = regs->tf_es;
  387         frame.sf_uc.uc_mcontext.sc_ds     = regs->tf_ds;
  388         frame.sf_uc.uc_mcontext.sc_edi    = regs->tf_edi;
  389         frame.sf_uc.uc_mcontext.sc_esi    = regs->tf_esi;
  390         frame.sf_uc.uc_mcontext.sc_ebp    = regs->tf_ebp;
  391         frame.sf_uc.uc_mcontext.sc_ebx    = regs->tf_ebx;
  392         frame.sf_uc.uc_mcontext.sc_esp    = regs->tf_esp;
  393         frame.sf_uc.uc_mcontext.sc_edx    = regs->tf_edx;
  394         frame.sf_uc.uc_mcontext.sc_ecx    = regs->tf_ecx;
  395         frame.sf_uc.uc_mcontext.sc_eax    = regs->tf_eax;
  396         frame.sf_uc.uc_mcontext.sc_eip    = regs->tf_eip;
  397         frame.sf_uc.uc_mcontext.sc_cs     = regs->tf_cs;
  398         frame.sf_uc.uc_mcontext.sc_eflags = regs->tf_eflags;
  399         frame.sf_uc.uc_mcontext.sc_esp_at_signal = regs->tf_esp;
  400         frame.sf_uc.uc_mcontext.sc_ss     = regs->tf_ss;
  401         frame.sf_uc.uc_mcontext.sc_err    = regs->tf_err;
  402         frame.sf_uc.uc_mcontext.sc_cr2    = (register_t)ksi->ksi_addr;
  403         frame.sf_uc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
  404 
  405         if (copyout(&frame, fp, sizeof(frame)) != 0) {
  406                 /*
  407                  * Process has trashed its stack; give it an illegal
  408                  * instruction to halt it in its tracks.
  409                  */
  410                 PROC_LOCK(p);
  411                 sigexit(td, SIGILL);
  412         }
  413 
  414         /* Build context to run handler in. */
  415         regs->tf_esp = PTROUT(fp);
  416         regs->tf_eip = linux_vdso_rt_sigcode;
  417         regs->tf_edi = PTROUT(catcher);
  418         regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D);
  419         regs->tf_cs = _ucodesel;
  420         regs->tf_ds = _udatasel;
  421         regs->tf_es = _udatasel;
  422         regs->tf_fs = _udatasel;
  423         regs->tf_ss = _udatasel;
  424         PROC_LOCK(p);
  425         mtx_lock(&psp->ps_mtx);
  426 }
  427 
  428 /*
  429  * Send an interrupt to process.
  430  *
  431  * Stack is set up to allow sigcode stored
  432  * in u. to call routine, followed by kcall
  433  * to sigreturn routine below.  After sigreturn
  434  * resets the signal mask, the stack, and the
  435  * frame pointer, it returns to the user
  436  * specified pc, psl.
  437  */
  438 static void
  439 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  440 {
  441         struct thread *td = curthread;
  442         struct proc *p = td->td_proc;
  443         struct sigacts *psp;
  444         struct trapframe *regs;
  445         struct l_sigframe *fp, frame;
  446         l_sigset_t lmask;
  447         int sig;
  448         int oonstack;
  449 
  450         PROC_LOCK_ASSERT(p, MA_OWNED);
  451         psp = p->p_sigacts;
  452         sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno);
  453         mtx_assert(&psp->ps_mtx, MA_OWNED);
  454         if (SIGISMEMBER(psp->ps_siginfo, sig)) {
  455                 /* Signal handler installed with SA_SIGINFO. */
  456                 linux_rt_sendsig(catcher, ksi, mask);
  457                 return;
  458         }
  459         regs = td->td_frame;
  460         oonstack = sigonstack(regs->tf_esp);
  461 
  462         /* Allocate space for the signal handler context. */
  463         if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
  464             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  465                 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
  466                     td->td_sigstk.ss_size - sizeof(struct l_sigframe));
  467         } else
  468                 fp = (struct l_sigframe *)regs->tf_esp - 1;
  469         mtx_unlock(&psp->ps_mtx);
  470         PROC_UNLOCK(p);
  471 
  472         /* Build the argument list for the signal handler. */
  473         sig = bsd_to_linux_signal(sig);
  474 
  475         bzero(&frame, sizeof(frame));
  476 
  477         frame.sf_sig = sig;
  478         frame.sf_sigmask = *mask;
  479         bsd_to_linux_sigset(mask, &lmask);
  480 
  481         /* Build the signal context to be used by sigreturn. */
  482         frame.sf_sc.sc_mask   = lmask.__mask;
  483         frame.sf_sc.sc_gs     = rgs();
  484         frame.sf_sc.sc_fs     = regs->tf_fs;
  485         frame.sf_sc.sc_es     = regs->tf_es;
  486         frame.sf_sc.sc_ds     = regs->tf_ds;
  487         frame.sf_sc.sc_edi    = regs->tf_edi;
  488         frame.sf_sc.sc_esi    = regs->tf_esi;
  489         frame.sf_sc.sc_ebp    = regs->tf_ebp;
  490         frame.sf_sc.sc_ebx    = regs->tf_ebx;
  491         frame.sf_sc.sc_esp    = regs->tf_esp;
  492         frame.sf_sc.sc_edx    = regs->tf_edx;
  493         frame.sf_sc.sc_ecx    = regs->tf_ecx;
  494         frame.sf_sc.sc_eax    = regs->tf_eax;
  495         frame.sf_sc.sc_eip    = regs->tf_eip;
  496         frame.sf_sc.sc_cs     = regs->tf_cs;
  497         frame.sf_sc.sc_eflags = regs->tf_eflags;
  498         frame.sf_sc.sc_esp_at_signal = regs->tf_esp;
  499         frame.sf_sc.sc_ss     = regs->tf_ss;
  500         frame.sf_sc.sc_err    = regs->tf_err;
  501         frame.sf_sc.sc_cr2    = (register_t)ksi->ksi_addr;
  502         frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno);
  503 
  504         if (copyout(&frame, fp, sizeof(frame)) != 0) {
  505                 /*
  506                  * Process has trashed its stack; give it an illegal
  507                  * instruction to halt it in its tracks.
  508                  */
  509                 PROC_LOCK(p);
  510                 sigexit(td, SIGILL);
  511         }
  512 
  513         /* Build context to run handler in. */
  514         regs->tf_esp = PTROUT(fp);
  515         regs->tf_eip = linux_vdso_sigcode;
  516         regs->tf_edi = PTROUT(catcher);
  517         regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D);
  518         regs->tf_cs = _ucodesel;
  519         regs->tf_ds = _udatasel;
  520         regs->tf_es = _udatasel;
  521         regs->tf_fs = _udatasel;
  522         regs->tf_ss = _udatasel;
  523         PROC_LOCK(p);
  524         mtx_lock(&psp->ps_mtx);
  525 }
  526 
  527 /*
  528  * System call to cleanup state after a signal
  529  * has been taken.  Reset signal mask and
  530  * stack state from context left by sendsig (above).
  531  * Return to previous pc and psl as specified by
  532  * context left by sendsig. Check carefully to
  533  * make sure that the user has not modified the
  534  * psl to gain improper privileges or to cause
  535  * a machine fault.
  536  */
  537 int
  538 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
  539 {
  540         struct l_sigframe frame;
  541         struct trapframe *regs;
  542         int eflags;
  543         ksiginfo_t ksi;
  544 
  545         regs = td->td_frame;
  546 
  547         /*
  548          * The trampoline code hands us the sigframe.
  549          * It is unsafe to keep track of it ourselves, in the event that a
  550          * program jumps out of a signal handler.
  551          */
  552         if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
  553                 return (EFAULT);
  554 
  555         /* Check for security violations. */
  556 #define EFLAGS_SECURE(ef, oef)  ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
  557         eflags = frame.sf_sc.sc_eflags;
  558         if (!EFLAGS_SECURE(eflags, regs->tf_eflags))
  559                 return (EINVAL);
  560 
  561         /*
  562          * Don't allow users to load a valid privileged %cs.  Let the
  563          * hardware check for invalid selectors, excess privilege in
  564          * other selectors, invalid %eip's and invalid %esp's.
  565          */
  566 #define CS_SECURE(cs)   (ISPL(cs) == SEL_UPL)
  567         if (!CS_SECURE(frame.sf_sc.sc_cs)) {
  568                 ksiginfo_init_trap(&ksi);
  569                 ksi.ksi_signo = SIGBUS;
  570                 ksi.ksi_code = BUS_OBJERR;
  571                 ksi.ksi_trapno = T_PROTFLT;
  572                 ksi.ksi_addr = (void *)regs->tf_eip;
  573                 trapsignal(td, &ksi);
  574                 return (EINVAL);
  575         }
  576 
  577         kern_sigprocmask(td, SIG_SETMASK, &frame.sf_sigmask, NULL, 0);
  578 
  579         /* Restore signal context. */
  580         /* %gs was restored by the trampoline. */
  581         regs->tf_fs     = frame.sf_sc.sc_fs;
  582         regs->tf_es     = frame.sf_sc.sc_es;
  583         regs->tf_ds     = frame.sf_sc.sc_ds;
  584         regs->tf_edi    = frame.sf_sc.sc_edi;
  585         regs->tf_esi    = frame.sf_sc.sc_esi;
  586         regs->tf_ebp    = frame.sf_sc.sc_ebp;
  587         regs->tf_ebx    = frame.sf_sc.sc_ebx;
  588         regs->tf_edx    = frame.sf_sc.sc_edx;
  589         regs->tf_ecx    = frame.sf_sc.sc_ecx;
  590         regs->tf_eax    = frame.sf_sc.sc_eax;
  591         regs->tf_eip    = frame.sf_sc.sc_eip;
  592         regs->tf_cs     = frame.sf_sc.sc_cs;
  593         regs->tf_eflags = eflags;
  594         regs->tf_esp    = frame.sf_sc.sc_esp_at_signal;
  595         regs->tf_ss     = frame.sf_sc.sc_ss;
  596 
  597         return (EJUSTRETURN);
  598 }
  599 
  600 /*
  601  * System call to cleanup state after a signal
  602  * has been taken.  Reset signal mask and
  603  * stack state from context left by rt_sendsig (above).
  604  * Return to previous pc and psl as specified by
  605  * context left by sendsig. Check carefully to
  606  * make sure that the user has not modified the
  607  * psl to gain improper privileges or to cause
  608  * a machine fault.
  609  */
  610 int
  611 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
  612 {
  613         struct l_ucontext uc;
  614         struct l_sigcontext *context;
  615         sigset_t bmask;
  616         l_stack_t *lss;
  617         stack_t ss;
  618         struct trapframe *regs;
  619         int eflags;
  620         ksiginfo_t ksi;
  621 
  622         regs = td->td_frame;
  623 
  624         /*
  625          * The trampoline code hands us the ucontext.
  626          * It is unsafe to keep track of it ourselves, in the event that a
  627          * program jumps out of a signal handler.
  628          */
  629         if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
  630                 return (EFAULT);
  631 
  632         context = &uc.uc_mcontext;
  633 
  634         /* Check for security violations. */
  635 #define EFLAGS_SECURE(ef, oef)  ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
  636         eflags = context->sc_eflags;
  637         if (!EFLAGS_SECURE(eflags, regs->tf_eflags))
  638                 return (EINVAL);
  639 
  640         /*
  641          * Don't allow users to load a valid privileged %cs.  Let the
  642          * hardware check for invalid selectors, excess privilege in
  643          * other selectors, invalid %eip's and invalid %esp's.
  644          */
  645 #define CS_SECURE(cs)   (ISPL(cs) == SEL_UPL)
  646         if (!CS_SECURE(context->sc_cs)) {
  647                 ksiginfo_init_trap(&ksi);
  648                 ksi.ksi_signo = SIGBUS;
  649                 ksi.ksi_code = BUS_OBJERR;
  650                 ksi.ksi_trapno = T_PROTFLT;
  651                 ksi.ksi_addr = (void *)regs->tf_eip;
  652                 trapsignal(td, &ksi);
  653                 return (EINVAL);
  654         }
  655 
  656         linux_to_bsd_sigset(&uc.uc_sigmask, &bmask);
  657         kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
  658 
  659         /* Restore signal context. */
  660         /* %gs was restored by the trampoline. */
  661         regs->tf_fs     = context->sc_fs;
  662         regs->tf_es     = context->sc_es;
  663         regs->tf_ds     = context->sc_ds;
  664         regs->tf_edi    = context->sc_edi;
  665         regs->tf_esi    = context->sc_esi;
  666         regs->tf_ebp    = context->sc_ebp;
  667         regs->tf_ebx    = context->sc_ebx;
  668         regs->tf_edx    = context->sc_edx;
  669         regs->tf_ecx    = context->sc_ecx;
  670         regs->tf_eax    = context->sc_eax;
  671         regs->tf_eip    = context->sc_eip;
  672         regs->tf_cs     = context->sc_cs;
  673         regs->tf_eflags = eflags;
  674         regs->tf_esp    = context->sc_esp_at_signal;
  675         regs->tf_ss     = context->sc_ss;
  676 
  677         /* Call sigaltstack & ignore results. */
  678         lss = &uc.uc_stack;
  679         ss.ss_sp = PTRIN(lss->ss_sp);
  680         ss.ss_size = lss->ss_size;
  681         ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
  682 
  683         (void)kern_sigaltstack(td, &ss, NULL);
  684 
  685         return (EJUSTRETURN);
  686 }
  687 
  688 static int
  689 linux_fetch_syscall_args(struct thread *td)
  690 {
  691         struct proc *p;
  692         struct trapframe *frame;
  693         struct syscall_args *sa;
  694 
  695         p = td->td_proc;
  696         frame = td->td_frame;
  697         sa = &td->td_sa;
  698 
  699         sa->code = frame->tf_eax;
  700         sa->original_code = sa->code;
  701         sa->args[0] = frame->tf_ebx;
  702         sa->args[1] = frame->tf_ecx;
  703         sa->args[2] = frame->tf_edx;
  704         sa->args[3] = frame->tf_esi;
  705         sa->args[4] = frame->tf_edi;
  706         sa->args[5] = frame->tf_ebp;    /* Unconfirmed */
  707 
  708         if (sa->code >= p->p_sysent->sv_size)
  709                 /* nosys */
  710                 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1];
  711         else
  712                 sa->callp = &p->p_sysent->sv_table[sa->code];
  713 
  714         td->td_retval[0] = 0;
  715         td->td_retval[1] = frame->tf_edx;
  716 
  717         return (0);
  718 }
  719 
  720 static void
  721 linux_set_syscall_retval(struct thread *td, int error)
  722 {
  723         struct trapframe *frame = td->td_frame;
  724 
  725         cpu_set_syscall_retval(td, error);
  726 
  727         if (__predict_false(error != 0)) {
  728                 if (error != ERESTART && error != EJUSTRETURN)
  729                         frame->tf_eax = bsd_to_linux_errno(error);
  730         }
  731 }
  732 
  733 static void
  734 linux_set_fork_retval(struct thread *td)
  735 {
  736         struct trapframe *frame = td->td_frame;
  737 
  738         frame->tf_eax = 0;
  739 }
  740 
  741 /*
  742  * exec_setregs may initialize some registers differently than Linux
  743  * does, thus potentially confusing Linux binaries. If necessary, we
  744  * override the exec_setregs default(s) here.
  745  */
  746 static void
  747 linux_exec_setregs(struct thread *td, struct image_params *imgp,
  748     uintptr_t stack)
  749 {
  750         struct pcb *pcb = td->td_pcb;
  751 
  752         exec_setregs(td, imgp, stack);
  753 
  754         /* Linux sets %gs to 0, we default to _udatasel. */
  755         pcb->pcb_gs = 0;
  756         load_gs(0);
  757 
  758         pcb->pcb_initial_npxcw = __LINUX_NPXCW__;
  759 }
  760 
  761 struct sysentvec linux_sysvec = {
  762         .sv_size        = LINUX_SYS_MAXSYSCALL,
  763         .sv_table       = linux_sysent,
  764         .sv_fixup       = linux_fixup,
  765         .sv_sendsig     = linux_sendsig,
  766         .sv_sigcode     = &_binary_linux_vdso_so_o_start,
  767         .sv_szsigcode   = &linux_szsigcode,
  768         .sv_name        = "Linux a.out",
  769         .sv_coredump    = NULL,
  770         .sv_imgact_try  = linux_exec_imgact_try,
  771         .sv_minsigstksz = LINUX_MINSIGSTKSZ,
  772         .sv_minuser     = VM_MIN_ADDRESS,
  773         .sv_maxuser     = VM_MAXUSER_ADDRESS,
  774         .sv_usrstack    = LINUX_USRSTACK,
  775         .sv_psstrings   = PS_STRINGS,
  776         .sv_psstringssz = sizeof(struct ps_strings),
  777         .sv_stackprot   = VM_PROT_ALL,
  778         .sv_copyout_strings = exec_copyout_strings,
  779         .sv_setregs     = linux_exec_setregs,
  780         .sv_fixlimit    = NULL,
  781         .sv_maxssiz     = NULL,
  782         .sv_flags       = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32 |
  783             SV_SIG_DISCIGN | SV_SIG_WAITNDQ,
  784         .sv_set_syscall_retval = linux_set_syscall_retval,
  785         .sv_fetch_syscall_args = linux_fetch_syscall_args,
  786         .sv_syscallnames = linux_syscallnames,
  787         .sv_schedtail   = linux_schedtail,
  788         .sv_thread_detach = linux_thread_detach,
  789         .sv_trap        = NULL,
  790         .sv_onexec      = linux_on_exec_vmspace,
  791         .sv_onexit      = linux_on_exit,
  792         .sv_ontdexit    = linux_thread_dtor,
  793         .sv_setid_allowed = &linux_setid_allowed_query,
  794         .sv_set_fork_retval = linux_set_fork_retval,
  795 };
  796 INIT_SYSENTVEC(aout_sysvec, &linux_sysvec);
  797 
  798 struct sysentvec elf_linux_sysvec = {
  799         .sv_size        = LINUX_SYS_MAXSYSCALL,
  800         .sv_table       = linux_sysent,
  801         .sv_fixup       = linux_fixup_elf,
  802         .sv_sendsig     = linux_sendsig,
  803         .sv_sigcode     = &_binary_linux_vdso_so_o_start,
  804         .sv_szsigcode   = &linux_szsigcode,
  805         .sv_name        = "Linux ELF32",
  806         .sv_coredump    = elf32_coredump,
  807         .sv_elf_core_osabi = ELFOSABI_FREEBSD,
  808         .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR,
  809         .sv_elf_core_prepare_notes = elf32_prepare_notes,
  810         .sv_imgact_try  = linux_exec_imgact_try,
  811         .sv_minsigstksz = LINUX_MINSIGSTKSZ,
  812         .sv_minuser     = VM_MIN_ADDRESS,
  813         .sv_maxuser     = VM_MAXUSER_ADDRESS,
  814         .sv_usrstack    = LINUX_USRSTACK,
  815         .sv_psstrings   = LINUX_PS_STRINGS,
  816         .sv_psstringssz = sizeof(struct ps_strings),
  817         .sv_stackprot   = VM_PROT_ALL,
  818         .sv_copyout_auxargs = linux_copyout_auxargs,
  819         .sv_copyout_strings = linux_copyout_strings,
  820         .sv_setregs     = linux_exec_setregs,
  821         .sv_fixlimit    = NULL,
  822         .sv_maxssiz     = NULL,
  823         .sv_flags       = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP |
  824             SV_SIG_DISCIGN | SV_SIG_WAITNDQ | SV_TIMEKEEP,
  825         .sv_set_syscall_retval = linux_set_syscall_retval,
  826         .sv_fetch_syscall_args = linux_fetch_syscall_args,
  827         .sv_syscallnames = NULL,
  828         .sv_shared_page_base = LINUX_SHAREDPAGE,
  829         .sv_shared_page_len = PAGE_SIZE,
  830         .sv_schedtail   = linux_schedtail,
  831         .sv_thread_detach = linux_thread_detach,
  832         .sv_trap        = NULL,
  833         .sv_onexec      = linux_on_exec_vmspace,
  834         .sv_onexit      = linux_on_exit,
  835         .sv_ontdexit    = linux_thread_dtor,
  836         .sv_setid_allowed = &linux_setid_allowed_query,
  837         .sv_set_fork_retval = linux_set_fork_retval,
  838 };
  839 
  840 static int
  841 linux_on_exec_vmspace(struct proc *p, struct image_params *imgp)
  842 {
  843         int error = 0;
  844 
  845         if (SV_PROC_FLAG(p, SV_SHP) != 0)
  846                 error = linux_map_vdso(p, linux_vdso_obj,
  847                     linux_vdso_base, LINUX_VDSOPAGE_SIZE, imgp);
  848         if (error == 0)
  849                 linux_on_exec(p, imgp);
  850         return (error);
  851 }
  852 
  853 /*
  854  * linux_vdso_install() and linux_exec_sysvec_init() must be called
  855  * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY).
  856  */
  857 static void
  858 linux_exec_sysvec_init(void *param)
  859 {
  860         l_uintptr_t *ktimekeep_base, *ktsc_selector;
  861         struct sysentvec *sv;
  862         ptrdiff_t tkoff;
  863 
  864         sv = param;
  865         /* Fill timekeep_base */
  866         exec_sysvec_init(sv);
  867 
  868         tkoff = kern_timekeep_base - linux_vdso_base;
  869         ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff);
  870         *ktimekeep_base = sv->sv_shared_page_base + sv->sv_timekeep_offset;
  871 
  872         tkoff = kern_tsc_selector - linux_vdso_base;
  873         ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff);
  874         *ktsc_selector = linux_vdso_tsc_selector_idx();
  875         if (bootverbose)
  876                 printf("Linux i386 vDSO tsc_selector: %u\n", *ktsc_selector);
  877 
  878         tkoff = kern_cpu_selector - linux_vdso_base;
  879         ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff);
  880         *ktsc_selector = linux_vdso_cpu_selector_idx();
  881         if (bootverbose)
  882                 printf("Linux i386 vDSO cpu_selector: %u\n", *ktsc_selector);
  883 }
  884 SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY,
  885     linux_exec_sysvec_init, &elf_linux_sysvec);
  886 
  887 static void
  888 linux_vdso_install(const void *param)
  889 {
  890         char *vdso_start = &_binary_linux_vdso_so_o_start;
  891         char *vdso_end = &_binary_linux_vdso_so_o_end;
  892 
  893         linux_szsigcode = vdso_end - vdso_start;
  894         MPASS(linux_szsigcode <= LINUX_VDSOPAGE_SIZE);
  895 
  896         linux_vdso_base = LINUX_VDSOPAGE;
  897 
  898         __elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base);
  899 
  900         linux_vdso_obj = __elfN(linux_shared_page_init)
  901             (&linux_vdso_mapping, LINUX_VDSOPAGE_SIZE);
  902         bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode);
  903 
  904         linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base);
  905 }
  906 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST,
  907     linux_vdso_install, NULL);
  908 
  909 static void
  910 linux_vdso_deinstall(const void *param)
  911 {
  912 
  913         __elfN(linux_shared_page_fini)(linux_vdso_obj,
  914             linux_vdso_mapping, LINUX_VDSOPAGE_SIZE);
  915 }
  916 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
  917     linux_vdso_deinstall, NULL);
  918 
  919 static void
  920 linux_vdso_reloc(char *mapping, Elf_Addr offset)
  921 {
  922         const Elf_Shdr *shdr;
  923         const Elf_Rel *rel;
  924         const Elf_Ehdr *ehdr;
  925         Elf_Addr *where;
  926         Elf_Size rtype, symidx;
  927         Elf_Addr addr, addend;
  928         int i, relcnt;
  929 
  930         MPASS(offset != 0);
  931 
  932         relcnt = 0;
  933         ehdr = (const Elf_Ehdr *)mapping;
  934         shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff);
  935         for (i = 0; i < ehdr->e_shnum; i++)
  936         {
  937                 switch (shdr[i].sh_type) {
  938                 case SHT_REL:
  939                         rel = (const Elf_Rel *)(mapping + shdr[i].sh_offset);
  940                         relcnt = shdr[i].sh_size / sizeof(*rel);
  941                         break;
  942                 case SHT_RELA:
  943                         printf("Linux i386 vDSO: unexpected Rela section\n");
  944                         break;
  945                 }
  946         }
  947 
  948         for (i = 0; i < relcnt; i++, rel++) {
  949                 where = (Elf_Addr *)(mapping + rel->r_offset);
  950                 addend = *where;
  951                 rtype = ELF_R_TYPE(rel->r_info);
  952                 symidx = ELF_R_SYM(rel->r_info);
  953 
  954                 switch (rtype) {
  955                 case R_386_NONE:        /* none */
  956                         break;
  957 
  958                 case R_386_RELATIVE:    /* B + A */
  959                         addr = (Elf_Addr)PTROUT(offset + addend);
  960                         if (*where != addr)
  961                                 *where = addr;
  962                         break;
  963 
  964                 case R_386_IRELATIVE:
  965                         printf("Linux i386 vDSO: unexpected ifunc relocation, "
  966                             "symbol index %d\n", symidx);
  967                         break;
  968                 default:
  969                         printf("Linux i386 vDSO: unexpected relocation type %d, "
  970                             "symbol index %d\n", rtype, symidx);
  971                 }
  972         }
  973 }
  974 
  975 static char GNU_ABI_VENDOR[] = "GNU";
  976 static int GNULINUX_ABI_DESC = 0;
  977 
  978 static bool
  979 linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
  980 {
  981         const Elf32_Word *desc;
  982         uintptr_t p;
  983 
  984         p = (uintptr_t)(note + 1);
  985         p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
  986 
  987         desc = (const Elf32_Word *)p;
  988         if (desc[0] != GNULINUX_ABI_DESC)
  989                 return (false);
  990 
  991         /*
  992          * For Linux we encode osrel using the Linux convention of
  993          *      (version << 16) | (major << 8) | (minor)
  994          * See macro in linux_mib.h
  995          */
  996         *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]);
  997 
  998         return (true);
  999 }
 1000 
 1001 static Elf_Brandnote linux_brandnote = {
 1002         .hdr.n_namesz   = sizeof(GNU_ABI_VENDOR),
 1003         .hdr.n_descsz   = 16,   /* XXX at least 16 */
 1004         .hdr.n_type     = 1,
 1005         .vendor         = GNU_ABI_VENDOR,
 1006         .flags          = BN_TRANSLATE_OSREL,
 1007         .trans_osrel    = linux_trans_osrel
 1008 };
 1009 
 1010 static Elf32_Brandinfo linux_brand = {
 1011         .brand          = ELFOSABI_LINUX,
 1012         .machine        = EM_386,
 1013         .compat_3_brand = "Linux",
 1014         .emul_path      = linux_emul_path,
 1015         .interp_path    = "/lib/ld-linux.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 static Elf32_Brandinfo linux_glibc2brand = {
 1023         .brand          = ELFOSABI_LINUX,
 1024         .machine        = EM_386,
 1025         .compat_3_brand = "Linux",
 1026         .emul_path      = linux_emul_path,
 1027         .interp_path    = "/lib/ld-linux.so.2",
 1028         .sysvec         = &elf_linux_sysvec,
 1029         .interp_newpath = NULL,
 1030         .brand_note     = &linux_brandnote,
 1031         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 1032 };
 1033 
 1034 static Elf32_Brandinfo linux_muslbrand = {
 1035         .brand          = ELFOSABI_LINUX,
 1036         .machine        = EM_386,
 1037         .compat_3_brand = "Linux",
 1038         .emul_path      = linux_emul_path,
 1039         .interp_path    = "/lib/ld-musl-i386.so.1",
 1040         .sysvec         = &elf_linux_sysvec,
 1041         .interp_newpath = NULL,
 1042         .brand_note     = &linux_brandnote,
 1043         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE |
 1044                             LINUX_BI_FUTEX_REQUEUE
 1045 };
 1046 
 1047 Elf32_Brandinfo *linux_brandlist[] = {
 1048         &linux_brand,
 1049         &linux_glibc2brand,
 1050         &linux_muslbrand,
 1051         NULL
 1052 };
 1053 
 1054 static int
 1055 linux_elf_modevent(module_t mod, int type, void *data)
 1056 {
 1057         Elf32_Brandinfo **brandinfo;
 1058         int error;
 1059         struct linux_ioctl_handler **lihp;
 1060 
 1061         error = 0;
 1062 
 1063         switch(type) {
 1064         case MOD_LOAD:
 1065                 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
 1066                      ++brandinfo)
 1067                         if (elf32_insert_brand_entry(*brandinfo) < 0)
 1068                                 error = EINVAL;
 1069                 if (error == 0) {
 1070                         SET_FOREACH(lihp, linux_ioctl_handler_set)
 1071                                 linux_ioctl_register_handler(*lihp);
 1072                         linux_dev_shm_create();
 1073                         linux_osd_jail_register();
 1074                         stclohz = (stathz ? stathz : hz);
 1075                         if (bootverbose)
 1076                                 printf("Linux ELF exec handler installed\n");
 1077                 } else
 1078                         printf("cannot insert Linux ELF brand handler\n");
 1079                 break;
 1080         case MOD_UNLOAD:
 1081                 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
 1082                      ++brandinfo)
 1083                         if (elf32_brand_inuse(*brandinfo))
 1084                                 error = EBUSY;
 1085                 if (error == 0) {
 1086                         for (brandinfo = &linux_brandlist[0];
 1087                              *brandinfo != NULL; ++brandinfo)
 1088                                 if (elf32_remove_brand_entry(*brandinfo) < 0)
 1089                                         error = EINVAL;
 1090                 }
 1091                 if (error == 0) {
 1092                         SET_FOREACH(lihp, linux_ioctl_handler_set)
 1093                                 linux_ioctl_unregister_handler(*lihp);
 1094                         linux_dev_shm_destroy();
 1095                         linux_osd_jail_deregister();
 1096                         if (bootverbose)
 1097                                 printf("Linux ELF exec handler removed\n");
 1098                 } else
 1099                         printf("Could not deinstall ELF interpreter entry\n");
 1100                 break;
 1101         default:
 1102                 return (EOPNOTSUPP);
 1103         }
 1104         return (error);
 1105 }
 1106 
 1107 static moduledata_t linux_elf_mod = {
 1108         "linuxelf",
 1109         linux_elf_modevent,
 1110         0
 1111 };
 1112 
 1113 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
 1114 FEATURE(linux, "Linux 32bit support");

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