The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/linux/linux_sysvec.c

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    1 /*-
    2  * Copyright (c) 1994-1996 Søren Schmidt
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: stable/10/sys/i386/linux/linux_sysvec.c 326814 2017-12-12 22:10:12Z pfg $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/exec.h>
   35 #include <sys/fcntl.h>
   36 #include <sys/imgact.h>
   37 #include <sys/imgact_aout.h>
   38 #include <sys/imgact_elf.h>
   39 #include <sys/kernel.h>
   40 #include <sys/lock.h>
   41 #include <sys/malloc.h>
   42 #include <sys/module.h>
   43 #include <sys/mutex.h>
   44 #include <sys/proc.h>
   45 #include <sys/signalvar.h>
   46 #include <sys/syscallsubr.h>
   47 #include <sys/sysctl.h>
   48 #include <sys/sysent.h>
   49 #include <sys/sysproto.h>
   50 #include <sys/vnode.h>
   51 #include <sys/eventhandler.h>
   52 
   53 #include <vm/vm.h>
   54 #include <vm/pmap.h>
   55 #include <vm/vm_extern.h>
   56 #include <vm/vm_map.h>
   57 #include <vm/vm_object.h>
   58 #include <vm/vm_page.h>
   59 #include <vm/vm_param.h>
   60 
   61 #include <machine/cpu.h>
   62 #include <machine/cputypes.h>
   63 #include <machine/md_var.h>
   64 #include <machine/pcb.h>
   65 
   66 #include <i386/linux/linux.h>
   67 #include <i386/linux/linux_proto.h>
   68 #include <compat/linux/linux_emul.h>
   69 #include <compat/linux/linux_futex.h>
   70 #include <compat/linux/linux_ioctl.h>
   71 #include <compat/linux/linux_mib.h>
   72 #include <compat/linux/linux_misc.h>
   73 #include <compat/linux/linux_signal.h>
   74 #include <compat/linux/linux_util.h>
   75 #include <compat/linux/linux_vdso.h>
   76 
   77 MODULE_VERSION(linux, 1);
   78 
   79 #if BYTE_ORDER == LITTLE_ENDIAN
   80 #define SHELLMAGIC      0x2123 /* #! */
   81 #else
   82 #define SHELLMAGIC      0x2321
   83 #endif
   84 
   85 #if defined(DEBUG)
   86 SYSCTL_PROC(_compat_linux, OID_AUTO, debug,
   87             CTLTYPE_STRING | CTLFLAG_RW,
   88             0, 0, linux_sysctl_debug, "A",
   89             "Linux debugging control");
   90 #endif
   91 
   92 /*
   93  * Allow the sendsig functions to use the ldebug() facility
   94  * even though they are not syscalls themselves. Map them
   95  * to syscall 0. This is slightly less bogus than using
   96  * ldebug(sigreturn).
   97  */
   98 #define LINUX_SYS_linux_rt_sendsig      0
   99 #define LINUX_SYS_linux_sendsig         0
  100 
  101 #define LINUX_PS_STRINGS        (LINUX_USRSTACK - sizeof(struct ps_strings))
  102 
  103 static int linux_szsigcode;
  104 static vm_object_t linux_shared_page_obj;
  105 static char *linux_shared_page_mapping;
  106 extern char _binary_linux_locore_o_start;
  107 extern char _binary_linux_locore_o_end;
  108 
  109 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
  110 
  111 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
  112 
  113 static int      linux_fixup(register_t **stack_base,
  114                     struct image_params *iparams);
  115 static int      elf_linux_fixup(register_t **stack_base,
  116                     struct image_params *iparams);
  117 static void     linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
  118 static void     exec_linux_setregs(struct thread *td,
  119                     struct image_params *imgp, u_long stack);
  120 static register_t *linux_copyout_strings(struct image_params *imgp);
  121 static boolean_t linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
  122 static void     linux_vdso_install(void *param);
  123 static void     linux_vdso_deinstall(void *param);
  124 
  125 static int linux_szplatform;
  126 const char *linux_kplatform;
  127 
  128 static eventhandler_tag linux_exit_tag;
  129 static eventhandler_tag linux_exec_tag;
  130 static eventhandler_tag linux_thread_dtor_tag;
  131 
  132 /*
  133  * Linux syscalls return negative errno's, we do positive and map them
  134  * Reference:
  135  *   FreeBSD: src/sys/sys/errno.h
  136  *   Linux:   linux-2.6.17.8/include/asm-generic/errno-base.h
  137  *            linux-2.6.17.8/include/asm-generic/errno.h
  138  */
  139 static int bsd_to_linux_errno[ELAST + 1] = {
  140         -0,  -1,  -2,  -3,  -4,  -5,  -6,  -7,  -8,  -9,
  141         -10, -35, -12, -13, -14, -15, -16, -17, -18, -19,
  142         -20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
  143         -30, -31, -32, -33, -34, -11,-115,-114, -88, -89,
  144         -90, -91, -92, -93, -94, -95, -96, -97, -98, -99,
  145         -100,-101,-102,-103,-104,-105,-106,-107,-108,-109,
  146         -110,-111, -40, -36,-112,-113, -39, -11, -87,-122,
  147         -116, -66,  -6,  -6,  -6,  -6,  -6, -37, -38,  -9,
  148           -6,  -6, -43, -42, -75,-125, -84, -61, -16, -74,
  149          -72, -67, -71
  150 };
  151 
  152 #define LINUX_T_UNKNOWN  255
  153 static int _bsd_to_linux_trapcode[] = {
  154         LINUX_T_UNKNOWN,        /* 0 */
  155         6,                      /* 1  T_PRIVINFLT */
  156         LINUX_T_UNKNOWN,        /* 2 */
  157         3,                      /* 3  T_BPTFLT */
  158         LINUX_T_UNKNOWN,        /* 4 */
  159         LINUX_T_UNKNOWN,        /* 5 */
  160         16,                     /* 6  T_ARITHTRAP */
  161         254,                    /* 7  T_ASTFLT */
  162         LINUX_T_UNKNOWN,        /* 8 */
  163         13,                     /* 9  T_PROTFLT */
  164         1,                      /* 10 T_TRCTRAP */
  165         LINUX_T_UNKNOWN,        /* 11 */
  166         14,                     /* 12 T_PAGEFLT */
  167         LINUX_T_UNKNOWN,        /* 13 */
  168         17,                     /* 14 T_ALIGNFLT */
  169         LINUX_T_UNKNOWN,        /* 15 */
  170         LINUX_T_UNKNOWN,        /* 16 */
  171         LINUX_T_UNKNOWN,        /* 17 */
  172         0,                      /* 18 T_DIVIDE */
  173         2,                      /* 19 T_NMI */
  174         4,                      /* 20 T_OFLOW */
  175         5,                      /* 21 T_BOUND */
  176         7,                      /* 22 T_DNA */
  177         8,                      /* 23 T_DOUBLEFLT */
  178         9,                      /* 24 T_FPOPFLT */
  179         10,                     /* 25 T_TSSFLT */
  180         11,                     /* 26 T_SEGNPFLT */
  181         12,                     /* 27 T_STKFLT */
  182         18,                     /* 28 T_MCHK */
  183         19,                     /* 29 T_XMMFLT */
  184         15                      /* 30 T_RESERVED */
  185 };
  186 #define bsd_to_linux_trapcode(code) \
  187     ((code)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \
  188      _bsd_to_linux_trapcode[(code)]: \
  189      LINUX_T_UNKNOWN)
  190 
  191 LINUX_VDSO_SYM_INTPTR(linux_sigcode);
  192 LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode);
  193 LINUX_VDSO_SYM_INTPTR(linux_vsyscall);
  194 
  195 /*
  196  * If FreeBSD & Linux have a difference of opinion about what a trap
  197  * means, deal with it here.
  198  *
  199  * MPSAFE
  200  */
  201 static int
  202 translate_traps(int signal, int trap_code)
  203 {
  204         if (signal != SIGBUS)
  205                 return (signal);
  206         switch (trap_code) {
  207         case T_PROTFLT:
  208         case T_TSSFLT:
  209         case T_DOUBLEFLT:
  210         case T_PAGEFLT:
  211                 return (SIGSEGV);
  212         default:
  213                 return (signal);
  214         }
  215 }
  216 
  217 static int
  218 linux_fixup(register_t **stack_base, struct image_params *imgp)
  219 {
  220         register_t *argv, *envp;
  221 
  222         argv = *stack_base;
  223         envp = *stack_base + (imgp->args->argc + 1);
  224         (*stack_base)--;
  225         suword(*stack_base, (intptr_t)(void *)envp);
  226         (*stack_base)--;
  227         suword(*stack_base, (intptr_t)(void *)argv);
  228         (*stack_base)--;
  229         suword(*stack_base, imgp->args->argc);
  230         return (0);
  231 }
  232 
  233 static int
  234 elf_linux_fixup(register_t **stack_base, struct image_params *imgp)
  235 {
  236         struct proc *p;
  237         Elf32_Auxargs *args;
  238         Elf32_Addr *uplatform;
  239         struct ps_strings *arginfo;
  240         register_t *pos;
  241         int issetugid;
  242 
  243         KASSERT(curthread->td_proc == imgp->proc,
  244             ("unsafe elf_linux_fixup(), should be curproc"));
  245 
  246         p = imgp->proc;
  247         issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
  248         arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
  249         uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform);
  250         args = (Elf32_Auxargs *)imgp->auxargs;
  251         pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2);
  252 
  253         AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
  254             imgp->proc->p_sysent->sv_shared_page_base);
  255         AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux_vsyscall);
  256         AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
  257 
  258         /*
  259          * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0,
  260          * as it has appeared in the 2.4.0-rc7 first time.
  261          * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK),
  262          * glibc falls back to the hard-coded CLK_TCK value when aux entry
  263          * is not present.
  264          * Also see linux_times() implementation.
  265          */
  266         if (linux_kernver(curthread) >= LINUX_KERNVER_2004000)
  267                 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
  268         AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
  269         AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
  270         AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
  271         AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
  272         AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
  273         AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
  274         AUXARGS_ENTRY(pos, AT_BASE, args->base);
  275         AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
  276         AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
  277         AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
  278         AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
  279         AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
  280         AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(uplatform));
  281         AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary);
  282         if (imgp->execpathp != 0)
  283                 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp);
  284         if (args->execfd != -1)
  285                 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
  286         AUXARGS_ENTRY(pos, AT_NULL, 0);
  287 
  288         free(imgp->auxargs, M_TEMP);
  289         imgp->auxargs = NULL;
  290 
  291         (*stack_base)--;
  292         suword(*stack_base, (register_t)imgp->args->argc);
  293         return (0);
  294 }
  295 
  296 /*
  297  * Copied from kern/kern_exec.c
  298  */
  299 static register_t *
  300 linux_copyout_strings(struct image_params *imgp)
  301 {
  302         int argc, envc;
  303         char **vectp;
  304         char *stringp, *destp;
  305         register_t *stack_base;
  306         struct ps_strings *arginfo;
  307         char canary[LINUX_AT_RANDOM_LEN];
  308         size_t execpath_len;
  309         struct proc *p;
  310 
  311         /*
  312          * Calculate string base and vector table pointers.
  313          */
  314         p = imgp->proc;
  315         if (imgp->execpath != NULL && imgp->auxargs != NULL)
  316                 execpath_len = strlen(imgp->execpath) + 1;
  317         else
  318                 execpath_len = 0;
  319         arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
  320         destp = (caddr_t)arginfo - SPARE_USRSPACE - linux_szplatform -
  321             roundup(sizeof(canary), sizeof(char *)) -
  322             roundup(execpath_len, sizeof(char *)) -
  323             roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *));
  324 
  325         /*
  326          * install LINUX_PLATFORM
  327          */
  328         copyout(linux_kplatform, ((caddr_t)arginfo - linux_szplatform),
  329             linux_szplatform);
  330 
  331         if (execpath_len != 0) {
  332                 imgp->execpathp = (uintptr_t)arginfo -
  333                 linux_szplatform - execpath_len;
  334                 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len);
  335         }
  336 
  337         /*
  338          * Prepare the canary for SSP.
  339          */
  340         arc4rand(canary, sizeof(canary), 0);
  341         imgp->canary = (uintptr_t)arginfo - linux_szplatform -
  342             roundup(execpath_len, sizeof(char *)) -
  343             roundup(sizeof(canary), sizeof(char *));
  344         copyout(canary, (void *)imgp->canary, sizeof(canary));
  345 
  346         /*
  347          * If we have a valid auxargs ptr, prepare some room
  348          * on the stack.
  349          */
  350         if (imgp->auxargs) {
  351                 /*
  352                  * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
  353                  * lower compatibility.
  354                  */
  355                 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size :
  356                     (LINUX_AT_COUNT * 2);
  357                 /*
  358                  * The '+ 2' is for the null pointers at the end of each of
  359                  * the arg and env vector sets,and imgp->auxarg_size is room
  360                  * for argument of Runtime loader.
  361                  */
  362                 vectp = (char **)(destp - (imgp->args->argc +
  363                     imgp->args->envc + 2 + imgp->auxarg_size) * sizeof(char *));
  364         } else {
  365                 /*
  366                  * The '+ 2' is for the null pointers at the end of each of
  367                  * the arg and env vector sets
  368                  */
  369                 vectp = (char **)(destp - (imgp->args->argc + imgp->args->envc + 2) *
  370                     sizeof(char *));
  371         }
  372 
  373         /*
  374          * vectp also becomes our initial stack base
  375          */
  376         stack_base = (register_t *)vectp;
  377 
  378         stringp = imgp->args->begin_argv;
  379         argc = imgp->args->argc;
  380         envc = imgp->args->envc;
  381 
  382         /*
  383          * Copy out strings - arguments and environment.
  384          */
  385         copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
  386 
  387         /*
  388          * Fill in "ps_strings" struct for ps, w, etc.
  389          */
  390         suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp);
  391         suword(&arginfo->ps_nargvstr, argc);
  392 
  393         /*
  394          * Fill in argument portion of vector table.
  395          */
  396         for (; argc > 0; --argc) {
  397                 suword(vectp++, (long)(intptr_t)destp);
  398                 while (*stringp++ != 0)
  399                         destp++;
  400                 destp++;
  401         }
  402 
  403         /* a null vector table pointer separates the argp's from the envp's */
  404         suword(vectp++, 0);
  405 
  406         suword(&arginfo->ps_envstr, (long)(intptr_t)vectp);
  407         suword(&arginfo->ps_nenvstr, envc);
  408 
  409         /*
  410          * Fill in environment portion of vector table.
  411          */
  412         for (; envc > 0; --envc) {
  413                 suword(vectp++, (long)(intptr_t)destp);
  414                 while (*stringp++ != 0)
  415                         destp++;
  416                 destp++;
  417         }
  418 
  419         /* end of vector table is a null pointer */
  420         suword(vectp, 0);
  421 
  422         return (stack_base);
  423 }
  424 
  425 static void
  426 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  427 {
  428         struct thread *td = curthread;
  429         struct proc *p = td->td_proc;
  430         struct sigacts *psp;
  431         struct trapframe *regs;
  432         struct l_rt_sigframe *fp, frame;
  433         int sig, code;
  434         int oonstack;
  435 
  436         sig = ksi->ksi_signo;
  437         code = ksi->ksi_code;   
  438         PROC_LOCK_ASSERT(p, MA_OWNED);
  439         psp = p->p_sigacts;
  440         mtx_assert(&psp->ps_mtx, MA_OWNED);
  441         regs = td->td_frame;
  442         oonstack = sigonstack(regs->tf_esp);
  443 
  444 #ifdef DEBUG
  445         if (ldebug(rt_sendsig))
  446                 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"),
  447                     catcher, sig, (void*)mask, code);
  448 #endif
  449         /*
  450          * Allocate space for the signal handler context.
  451          */
  452         if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
  453             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  454                 fp = (struct l_rt_sigframe *)(td->td_sigstk.ss_sp +
  455                     td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
  456         } else
  457                 fp = (struct l_rt_sigframe *)regs->tf_esp - 1;
  458         mtx_unlock(&psp->ps_mtx);
  459 
  460         /*
  461          * Build the argument list for the signal handler.
  462          */
  463         sig = bsd_to_linux_signal(sig);
  464 
  465         bzero(&frame, sizeof(frame));
  466 
  467         frame.sf_handler = catcher;
  468         frame.sf_sig = sig;
  469         frame.sf_siginfo = &fp->sf_si;
  470         frame.sf_ucontext = &fp->sf_sc;
  471 
  472         /* Fill in POSIX parts */
  473         ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig);
  474 
  475         /*
  476          * Build the signal context to be used by sigreturn.
  477          */
  478         frame.sf_sc.uc_flags = 0;               /* XXX ??? */
  479         frame.sf_sc.uc_link = NULL;             /* XXX ??? */
  480 
  481         frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp;
  482         frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
  483         frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
  484             ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
  485         PROC_UNLOCK(p);
  486 
  487         bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask);
  488 
  489         frame.sf_sc.uc_mcontext.sc_mask   = frame.sf_sc.uc_sigmask.__mask;
  490         frame.sf_sc.uc_mcontext.sc_gs     = rgs();
  491         frame.sf_sc.uc_mcontext.sc_fs     = regs->tf_fs;
  492         frame.sf_sc.uc_mcontext.sc_es     = regs->tf_es;
  493         frame.sf_sc.uc_mcontext.sc_ds     = regs->tf_ds;
  494         frame.sf_sc.uc_mcontext.sc_edi    = regs->tf_edi;
  495         frame.sf_sc.uc_mcontext.sc_esi    = regs->tf_esi;
  496         frame.sf_sc.uc_mcontext.sc_ebp    = regs->tf_ebp;
  497         frame.sf_sc.uc_mcontext.sc_ebx    = regs->tf_ebx;
  498         frame.sf_sc.uc_mcontext.sc_esp    = regs->tf_esp;
  499         frame.sf_sc.uc_mcontext.sc_edx    = regs->tf_edx;
  500         frame.sf_sc.uc_mcontext.sc_ecx    = regs->tf_ecx;
  501         frame.sf_sc.uc_mcontext.sc_eax    = regs->tf_eax;
  502         frame.sf_sc.uc_mcontext.sc_eip    = regs->tf_eip;
  503         frame.sf_sc.uc_mcontext.sc_cs     = regs->tf_cs;
  504         frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags;
  505         frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp;
  506         frame.sf_sc.uc_mcontext.sc_ss     = regs->tf_ss;
  507         frame.sf_sc.uc_mcontext.sc_err    = regs->tf_err;
  508         frame.sf_sc.uc_mcontext.sc_cr2    = (register_t)ksi->ksi_addr;
  509         frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
  510 
  511 #ifdef DEBUG
  512         if (ldebug(rt_sendsig))
  513                 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"),
  514                     frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp,
  515                     td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask);
  516 #endif
  517 
  518         if (copyout(&frame, fp, sizeof(frame)) != 0) {
  519                 /*
  520                  * Process has trashed its stack; give it an illegal
  521                  * instruction to halt it in its tracks.
  522                  */
  523 #ifdef DEBUG
  524                 if (ldebug(rt_sendsig))
  525                         printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"),
  526                             fp, oonstack);
  527 #endif
  528                 PROC_LOCK(p);
  529                 sigexit(td, SIGILL);
  530         }
  531 
  532         /*
  533          * Build context to run handler in.
  534          */
  535         regs->tf_esp = (int)fp;
  536         regs->tf_eip = linux_rt_sigcode;
  537         regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D);
  538         regs->tf_cs = _ucodesel;
  539         regs->tf_ds = _udatasel;
  540         regs->tf_es = _udatasel;
  541         regs->tf_fs = _udatasel;
  542         regs->tf_ss = _udatasel;
  543         PROC_LOCK(p);
  544         mtx_lock(&psp->ps_mtx);
  545 }
  546 
  547 
  548 /*
  549  * Send an interrupt to process.
  550  *
  551  * Stack is set up to allow sigcode stored
  552  * in u. to call routine, followed by kcall
  553  * to sigreturn routine below.  After sigreturn
  554  * resets the signal mask, the stack, and the
  555  * frame pointer, it returns to the user
  556  * specified pc, psl.
  557  */
  558 static void
  559 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  560 {
  561         struct thread *td = curthread;
  562         struct proc *p = td->td_proc;
  563         struct sigacts *psp;
  564         struct trapframe *regs;
  565         struct l_sigframe *fp, frame;
  566         l_sigset_t lmask;
  567         int sig, code;
  568         int oonstack;
  569 
  570         PROC_LOCK_ASSERT(p, MA_OWNED);
  571         psp = p->p_sigacts;
  572         sig = ksi->ksi_signo;
  573         code = ksi->ksi_code;
  574         mtx_assert(&psp->ps_mtx, MA_OWNED);
  575         if (SIGISMEMBER(psp->ps_siginfo, sig)) {
  576                 /* Signal handler installed with SA_SIGINFO. */
  577                 linux_rt_sendsig(catcher, ksi, mask);
  578                 return;
  579         }
  580         regs = td->td_frame;
  581         oonstack = sigonstack(regs->tf_esp);
  582 
  583 #ifdef DEBUG
  584         if (ldebug(sendsig))
  585                 printf(ARGS(sendsig, "%p, %d, %p, %u"),
  586                     catcher, sig, (void*)mask, code);
  587 #endif
  588 
  589         /*
  590          * Allocate space for the signal handler context.
  591          */
  592         if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
  593             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  594                 fp = (struct l_sigframe *)(td->td_sigstk.ss_sp +
  595                     td->td_sigstk.ss_size - sizeof(struct l_sigframe));
  596         } else
  597                 fp = (struct l_sigframe *)regs->tf_esp - 1;
  598         mtx_unlock(&psp->ps_mtx);
  599         PROC_UNLOCK(p);
  600 
  601         /*
  602          * Build the argument list for the signal handler.
  603          */
  604         sig = bsd_to_linux_signal(sig);
  605 
  606         bzero(&frame, sizeof(frame));
  607 
  608         frame.sf_handler = catcher;
  609         frame.sf_sig = sig;
  610 
  611         bsd_to_linux_sigset(mask, &lmask);
  612 
  613         /*
  614          * Build the signal context to be used by sigreturn.
  615          */
  616         frame.sf_sc.sc_mask   = lmask.__mask;
  617         frame.sf_sc.sc_gs     = rgs();
  618         frame.sf_sc.sc_fs     = regs->tf_fs;
  619         frame.sf_sc.sc_es     = regs->tf_es;
  620         frame.sf_sc.sc_ds     = regs->tf_ds;
  621         frame.sf_sc.sc_edi    = regs->tf_edi;
  622         frame.sf_sc.sc_esi    = regs->tf_esi;
  623         frame.sf_sc.sc_ebp    = regs->tf_ebp;
  624         frame.sf_sc.sc_ebx    = regs->tf_ebx;
  625         frame.sf_sc.sc_esp    = regs->tf_esp;
  626         frame.sf_sc.sc_edx    = regs->tf_edx;
  627         frame.sf_sc.sc_ecx    = regs->tf_ecx;
  628         frame.sf_sc.sc_eax    = regs->tf_eax;
  629         frame.sf_sc.sc_eip    = regs->tf_eip;
  630         frame.sf_sc.sc_cs     = regs->tf_cs;
  631         frame.sf_sc.sc_eflags = regs->tf_eflags;
  632         frame.sf_sc.sc_esp_at_signal = regs->tf_esp;
  633         frame.sf_sc.sc_ss     = regs->tf_ss;
  634         frame.sf_sc.sc_err    = regs->tf_err;
  635         frame.sf_sc.sc_cr2    = (register_t)ksi->ksi_addr;
  636         frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno);
  637 
  638         frame.sf_extramask[0] = lmask.__mask;
  639 
  640         if (copyout(&frame, fp, sizeof(frame)) != 0) {
  641                 /*
  642                  * Process has trashed its stack; give it an illegal
  643                  * instruction to halt it in its tracks.
  644                  */
  645                 PROC_LOCK(p);
  646                 sigexit(td, SIGILL);
  647         }
  648 
  649         /*
  650          * Build context to run handler in.
  651          */
  652         regs->tf_esp = (int)fp;
  653         regs->tf_eip = linux_sigcode;
  654         regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D);
  655         regs->tf_cs = _ucodesel;
  656         regs->tf_ds = _udatasel;
  657         regs->tf_es = _udatasel;
  658         regs->tf_fs = _udatasel;
  659         regs->tf_ss = _udatasel;
  660         PROC_LOCK(p);
  661         mtx_lock(&psp->ps_mtx);
  662 }
  663 
  664 /*
  665  * System call to cleanup state after a signal
  666  * has been taken.  Reset signal mask and
  667  * stack state from context left by sendsig (above).
  668  * Return to previous pc and psl as specified by
  669  * context left by sendsig. Check carefully to
  670  * make sure that the user has not modified the
  671  * psl to gain improper privileges or to cause
  672  * a machine fault.
  673  */
  674 int
  675 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
  676 {
  677         struct l_sigframe frame;
  678         struct trapframe *regs;
  679         l_sigset_t lmask;
  680         sigset_t bmask;
  681         int eflags;
  682         ksiginfo_t ksi;
  683 
  684         regs = td->td_frame;
  685 
  686 #ifdef DEBUG
  687         if (ldebug(sigreturn))
  688                 printf(ARGS(sigreturn, "%p"), (void *)args->sfp);
  689 #endif
  690         /*
  691          * The trampoline code hands us the sigframe.
  692          * It is unsafe to keep track of it ourselves, in the event that a
  693          * program jumps out of a signal handler.
  694          */
  695         if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
  696                 return (EFAULT);
  697 
  698         /*
  699          * Check for security violations.
  700          */
  701 #define EFLAGS_SECURE(ef, oef)  ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
  702         eflags = frame.sf_sc.sc_eflags;
  703         if (!EFLAGS_SECURE(eflags, regs->tf_eflags))
  704                 return (EINVAL);
  705 
  706         /*
  707          * Don't allow users to load a valid privileged %cs.  Let the
  708          * hardware check for invalid selectors, excess privilege in
  709          * other selectors, invalid %eip's and invalid %esp's.
  710          */
  711 #define CS_SECURE(cs)   (ISPL(cs) == SEL_UPL)
  712         if (!CS_SECURE(frame.sf_sc.sc_cs)) {
  713                 ksiginfo_init_trap(&ksi);
  714                 ksi.ksi_signo = SIGBUS;
  715                 ksi.ksi_code = BUS_OBJERR;
  716                 ksi.ksi_trapno = T_PROTFLT;
  717                 ksi.ksi_addr = (void *)regs->tf_eip;
  718                 trapsignal(td, &ksi);
  719                 return (EINVAL);
  720         }
  721 
  722         lmask.__mask = frame.sf_sc.sc_mask;
  723         linux_to_bsd_sigset(&lmask, &bmask);
  724         kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
  725 
  726         /*
  727          * Restore signal context.
  728          */
  729         /* %gs was restored by the trampoline. */
  730         regs->tf_fs     = frame.sf_sc.sc_fs;
  731         regs->tf_es     = frame.sf_sc.sc_es;
  732         regs->tf_ds     = frame.sf_sc.sc_ds;
  733         regs->tf_edi    = frame.sf_sc.sc_edi;
  734         regs->tf_esi    = frame.sf_sc.sc_esi;
  735         regs->tf_ebp    = frame.sf_sc.sc_ebp;
  736         regs->tf_ebx    = frame.sf_sc.sc_ebx;
  737         regs->tf_edx    = frame.sf_sc.sc_edx;
  738         regs->tf_ecx    = frame.sf_sc.sc_ecx;
  739         regs->tf_eax    = frame.sf_sc.sc_eax;
  740         regs->tf_eip    = frame.sf_sc.sc_eip;
  741         regs->tf_cs     = frame.sf_sc.sc_cs;
  742         regs->tf_eflags = eflags;
  743         regs->tf_esp    = frame.sf_sc.sc_esp_at_signal;
  744         regs->tf_ss     = frame.sf_sc.sc_ss;
  745 
  746         return (EJUSTRETURN);
  747 }
  748 
  749 /*
  750  * System call to cleanup state after a signal
  751  * has been taken.  Reset signal mask and
  752  * stack state from context left by rt_sendsig (above).
  753  * Return to previous pc and psl as specified by
  754  * context left by sendsig. Check carefully to
  755  * make sure that the user has not modified the
  756  * psl to gain improper privileges or to cause
  757  * a machine fault.
  758  */
  759 int
  760 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
  761 {
  762         struct l_ucontext uc;
  763         struct l_sigcontext *context;
  764         sigset_t bmask;
  765         l_stack_t *lss;
  766         stack_t ss;
  767         struct trapframe *regs;
  768         int eflags;
  769         ksiginfo_t ksi;
  770 
  771         regs = td->td_frame;
  772 
  773 #ifdef DEBUG
  774         if (ldebug(rt_sigreturn))
  775                 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp);
  776 #endif
  777         /*
  778          * The trampoline code hands us the ucontext.
  779          * It is unsafe to keep track of it ourselves, in the event that a
  780          * program jumps out of a signal handler.
  781          */
  782         if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
  783                 return (EFAULT);
  784 
  785         context = &uc.uc_mcontext;
  786 
  787         /*
  788          * Check for security violations.
  789          */
  790 #define EFLAGS_SECURE(ef, oef)  ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
  791         eflags = context->sc_eflags;
  792         if (!EFLAGS_SECURE(eflags, regs->tf_eflags))
  793                 return (EINVAL);
  794 
  795         /*
  796          * Don't allow users to load a valid privileged %cs.  Let the
  797          * hardware check for invalid selectors, excess privilege in
  798          * other selectors, invalid %eip's and invalid %esp's.
  799          */
  800 #define CS_SECURE(cs)   (ISPL(cs) == SEL_UPL)
  801         if (!CS_SECURE(context->sc_cs)) {
  802                 ksiginfo_init_trap(&ksi);
  803                 ksi.ksi_signo = SIGBUS;
  804                 ksi.ksi_code = BUS_OBJERR;
  805                 ksi.ksi_trapno = T_PROTFLT;
  806                 ksi.ksi_addr = (void *)regs->tf_eip;
  807                 trapsignal(td, &ksi);
  808                 return (EINVAL);
  809         }
  810 
  811         linux_to_bsd_sigset(&uc.uc_sigmask, &bmask);
  812         kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
  813 
  814         /*
  815          * Restore signal context
  816          */
  817         /* %gs was restored by the trampoline. */
  818         regs->tf_fs     = context->sc_fs;
  819         regs->tf_es     = context->sc_es;
  820         regs->tf_ds     = context->sc_ds;
  821         regs->tf_edi    = context->sc_edi;
  822         regs->tf_esi    = context->sc_esi;
  823         regs->tf_ebp    = context->sc_ebp;
  824         regs->tf_ebx    = context->sc_ebx;
  825         regs->tf_edx    = context->sc_edx;
  826         regs->tf_ecx    = context->sc_ecx;
  827         regs->tf_eax    = context->sc_eax;
  828         regs->tf_eip    = context->sc_eip;
  829         regs->tf_cs     = context->sc_cs;
  830         regs->tf_eflags = eflags;
  831         regs->tf_esp    = context->sc_esp_at_signal;
  832         regs->tf_ss     = context->sc_ss;
  833 
  834         /*
  835          * call sigaltstack & ignore results..
  836          */
  837         lss = &uc.uc_stack;
  838         ss.ss_sp = lss->ss_sp;
  839         ss.ss_size = lss->ss_size;
  840         ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
  841 
  842 #ifdef DEBUG
  843         if (ldebug(rt_sigreturn))
  844                 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"),
  845                     ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask);
  846 #endif
  847         (void)kern_sigaltstack(td, &ss, NULL);
  848 
  849         return (EJUSTRETURN);
  850 }
  851 
  852 static int
  853 linux_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
  854 {
  855         struct proc *p;
  856         struct trapframe *frame;
  857 
  858         p = td->td_proc;
  859         frame = td->td_frame;
  860 
  861         sa->code = frame->tf_eax;
  862         sa->args[0] = frame->tf_ebx;
  863         sa->args[1] = frame->tf_ecx;
  864         sa->args[2] = frame->tf_edx;
  865         sa->args[3] = frame->tf_esi;
  866         sa->args[4] = frame->tf_edi;
  867         sa->args[5] = frame->tf_ebp;    /* Unconfirmed */
  868 
  869         if (sa->code >= p->p_sysent->sv_size)
  870                 /* nosys */
  871                 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1];
  872         else
  873                 sa->callp = &p->p_sysent->sv_table[sa->code];
  874         sa->narg = sa->callp->sy_narg;
  875 
  876         td->td_retval[0] = 0;
  877         td->td_retval[1] = frame->tf_edx;
  878 
  879         return (0);
  880 }
  881 
  882 /*
  883  * If a linux binary is exec'ing something, try this image activator
  884  * first.  We override standard shell script execution in order to
  885  * be able to modify the interpreter path.  We only do this if a linux
  886  * binary is doing the exec, so we do not create an EXEC module for it.
  887  */
  888 static int      exec_linux_imgact_try(struct image_params *iparams);
  889 
  890 static int
  891 exec_linux_imgact_try(struct image_params *imgp)
  892 {
  893     const char *head = (const char *)imgp->image_header;
  894     char *rpath;
  895     int error = -1;
  896 
  897     /*
  898      * The interpreter for shell scripts run from a linux binary needs
  899      * to be located in /compat/linux if possible in order to recursively
  900      * maintain linux path emulation.
  901      */
  902     if (((const short *)head)[0] == SHELLMAGIC) {
  903             /*
  904              * Run our normal shell image activator.  If it succeeds attempt
  905              * to use the alternate path for the interpreter.  If an alternate
  906              * path is found, use our stringspace to store it.
  907              */
  908             if ((error = exec_shell_imgact(imgp)) == 0) {
  909                     linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc),
  910                         imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, AT_FDCWD);
  911                     if (rpath != NULL)
  912                             imgp->args->fname_buf =
  913                                 imgp->interpreter_name = rpath;
  914             }
  915     }
  916     return (error);
  917 }
  918 
  919 /*
  920  * exec_setregs may initialize some registers differently than Linux
  921  * does, thus potentially confusing Linux binaries. If necessary, we
  922  * override the exec_setregs default(s) here.
  923  */
  924 static void
  925 exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack)
  926 {
  927         struct pcb *pcb = td->td_pcb;
  928 
  929         exec_setregs(td, imgp, stack);
  930 
  931         /* Linux sets %gs to 0, we default to _udatasel */
  932         pcb->pcb_gs = 0;
  933         load_gs(0);
  934 
  935         pcb->pcb_initial_npxcw = __LINUX_NPXCW__;
  936 }
  937 
  938 static void
  939 linux_get_machine(const char **dst)
  940 {
  941 
  942         switch (cpu_class) {
  943         case CPUCLASS_686:
  944                 *dst = "i686";
  945                 break;
  946         case CPUCLASS_586:
  947                 *dst = "i586";
  948                 break;
  949         case CPUCLASS_486:
  950                 *dst = "i486";
  951                 break;
  952         default:
  953                 *dst = "i386";
  954         }
  955 }
  956 
  957 struct sysentvec linux_sysvec = {
  958         .sv_size        = LINUX_SYS_MAXSYSCALL,
  959         .sv_table       = linux_sysent,
  960         .sv_mask        = 0,
  961         .sv_sigsize     = 0,
  962         .sv_sigtbl      = NULL,
  963         .sv_errsize     = ELAST + 1,
  964         .sv_errtbl      = bsd_to_linux_errno,
  965         .sv_transtrap   = translate_traps,
  966         .sv_fixup       = linux_fixup,
  967         .sv_sendsig     = linux_sendsig,
  968         .sv_sigcode     = &_binary_linux_locore_o_start,
  969         .sv_szsigcode   = &linux_szsigcode,
  970         .sv_prepsyscall = NULL,
  971         .sv_name        = "Linux a.out",
  972         .sv_coredump    = NULL,
  973         .sv_imgact_try  = exec_linux_imgact_try,
  974         .sv_minsigstksz = LINUX_MINSIGSTKSZ,
  975         .sv_pagesize    = PAGE_SIZE,
  976         .sv_minuser     = VM_MIN_ADDRESS,
  977         .sv_maxuser     = VM_MAXUSER_ADDRESS,
  978         .sv_usrstack    = LINUX_USRSTACK,
  979         .sv_psstrings   = PS_STRINGS,
  980         .sv_stackprot   = VM_PROT_ALL,
  981         .sv_copyout_strings = exec_copyout_strings,
  982         .sv_setregs     = exec_linux_setregs,
  983         .sv_fixlimit    = NULL,
  984         .sv_maxssiz     = NULL,
  985         .sv_flags       = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32,
  986         .sv_set_syscall_retval = cpu_set_syscall_retval,
  987         .sv_fetch_syscall_args = linux_fetch_syscall_args,
  988         .sv_syscallnames = NULL,
  989         .sv_shared_page_base = LINUX_SHAREDPAGE,
  990         .sv_shared_page_len = PAGE_SIZE,
  991         .sv_schedtail   = linux_schedtail,
  992         .sv_thread_detach = linux_thread_detach,
  993         .sv_trap        = NULL,
  994 };
  995 INIT_SYSENTVEC(aout_sysvec, &linux_sysvec);
  996 
  997 struct sysentvec elf_linux_sysvec = {
  998         .sv_size        = LINUX_SYS_MAXSYSCALL,
  999         .sv_table       = linux_sysent,
 1000         .sv_mask        = 0,
 1001         .sv_sigsize     = 0,
 1002         .sv_sigtbl      = NULL,
 1003         .sv_errsize     = ELAST + 1,
 1004         .sv_errtbl      = bsd_to_linux_errno,
 1005         .sv_transtrap   = translate_traps,
 1006         .sv_fixup       = elf_linux_fixup,
 1007         .sv_sendsig     = linux_sendsig,
 1008         .sv_sigcode     = &_binary_linux_locore_o_start,
 1009         .sv_szsigcode   = &linux_szsigcode,
 1010         .sv_prepsyscall = NULL,
 1011         .sv_name        = "Linux ELF",
 1012         .sv_coredump    = elf32_coredump,
 1013         .sv_imgact_try  = exec_linux_imgact_try,
 1014         .sv_minsigstksz = LINUX_MINSIGSTKSZ,
 1015         .sv_pagesize    = PAGE_SIZE,
 1016         .sv_minuser     = VM_MIN_ADDRESS,
 1017         .sv_maxuser     = VM_MAXUSER_ADDRESS,
 1018         .sv_usrstack    = LINUX_USRSTACK,
 1019         .sv_psstrings   = LINUX_PS_STRINGS,
 1020         .sv_stackprot   = VM_PROT_ALL,
 1021         .sv_copyout_strings = linux_copyout_strings,
 1022         .sv_setregs     = exec_linux_setregs,
 1023         .sv_fixlimit    = NULL,
 1024         .sv_maxssiz     = NULL,
 1025         .sv_flags       = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP,
 1026         .sv_set_syscall_retval = cpu_set_syscall_retval,
 1027         .sv_fetch_syscall_args = linux_fetch_syscall_args,
 1028         .sv_syscallnames = NULL,
 1029         .sv_shared_page_base = LINUX_SHAREDPAGE,
 1030         .sv_shared_page_len = PAGE_SIZE,
 1031         .sv_schedtail   = linux_schedtail,
 1032         .sv_thread_detach = linux_thread_detach,
 1033         .sv_trap        = NULL,
 1034 };
 1035 
 1036 static void
 1037 linux_vdso_install(void *param)
 1038 {
 1039 
 1040         linux_szsigcode = (&_binary_linux_locore_o_end - 
 1041             &_binary_linux_locore_o_start);
 1042 
 1043         if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
 1044                 panic("Linux invalid vdso size\n");
 1045 
 1046         __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
 1047 
 1048         linux_shared_page_obj = __elfN(linux_shared_page_init)
 1049             (&linux_shared_page_mapping);
 1050 
 1051         __elfN(linux_vdso_reloc)(&elf_linux_sysvec, LINUX_SHAREDPAGE);
 1052 
 1053         bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
 1054             linux_szsigcode);
 1055         elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
 1056 }
 1057 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
 1058     (sysinit_cfunc_t)linux_vdso_install, NULL);
 1059 
 1060 static void
 1061 linux_vdso_deinstall(void *param)
 1062 {
 1063 
 1064         __elfN(linux_shared_page_fini)(linux_shared_page_obj);
 1065 };
 1066 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
 1067     (sysinit_cfunc_t)linux_vdso_deinstall, NULL);
 1068 
 1069 static char GNU_ABI_VENDOR[] = "GNU";
 1070 static int GNULINUX_ABI_DESC = 0;
 1071 
 1072 static boolean_t
 1073 linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
 1074 {
 1075         const Elf32_Word *desc;
 1076         uintptr_t p;
 1077 
 1078         p = (uintptr_t)(note + 1);
 1079         p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
 1080 
 1081         desc = (const Elf32_Word *)p;
 1082         if (desc[0] != GNULINUX_ABI_DESC)
 1083                 return (FALSE);
 1084 
 1085         /*
 1086          * For linux we encode osrel as follows (see linux_mib.c):
 1087          * VVVMMMIII (version, major, minor), see linux_mib.c.
 1088          */
 1089         *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3];
 1090 
 1091         return (TRUE);
 1092 }
 1093 
 1094 static Elf_Brandnote linux_brandnote = {
 1095         .hdr.n_namesz   = sizeof(GNU_ABI_VENDOR),
 1096         .hdr.n_descsz   = 16,   /* XXX at least 16 */
 1097         .hdr.n_type     = 1,
 1098         .vendor         = GNU_ABI_VENDOR,
 1099         .flags          = BN_TRANSLATE_OSREL,
 1100         .trans_osrel    = linux_trans_osrel
 1101 };
 1102 
 1103 static Elf32_Brandinfo linux_brand = {
 1104         .brand          = ELFOSABI_LINUX,
 1105         .machine        = EM_386,
 1106         .compat_3_brand = "Linux",
 1107         .emul_path      = "/compat/linux",
 1108         .interp_path    = "/lib/ld-linux.so.1",
 1109         .sysvec         = &elf_linux_sysvec,
 1110         .interp_newpath = NULL,
 1111         .brand_note     = &linux_brandnote,
 1112         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 1113 };
 1114 
 1115 static Elf32_Brandinfo linux_glibc2brand = {
 1116         .brand          = ELFOSABI_LINUX,
 1117         .machine        = EM_386,
 1118         .compat_3_brand = "Linux",
 1119         .emul_path      = "/compat/linux",
 1120         .interp_path    = "/lib/ld-linux.so.2",
 1121         .sysvec         = &elf_linux_sysvec,
 1122         .interp_newpath = NULL,
 1123         .brand_note     = &linux_brandnote,
 1124         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 1125 };
 1126 
 1127 Elf32_Brandinfo *linux_brandlist[] = {
 1128         &linux_brand,
 1129         &linux_glibc2brand,
 1130         NULL
 1131 };
 1132 
 1133 static int
 1134 linux_elf_modevent(module_t mod, int type, void *data)
 1135 {
 1136         Elf32_Brandinfo **brandinfo;
 1137         int error;
 1138         struct linux_ioctl_handler **lihp;
 1139 
 1140         error = 0;
 1141 
 1142         switch(type) {
 1143         case MOD_LOAD:
 1144                 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
 1145                      ++brandinfo)
 1146                         if (elf32_insert_brand_entry(*brandinfo) < 0)
 1147                                 error = EINVAL;
 1148                 if (error == 0) {
 1149                         SET_FOREACH(lihp, linux_ioctl_handler_set)
 1150                                 linux_ioctl_register_handler(*lihp);
 1151                         LIST_INIT(&futex_list);
 1152                         mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF);
 1153                         linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, linux_proc_exit,
 1154                               NULL, 1000);
 1155                         linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, linux_proc_exec,
 1156                               NULL, 1000);
 1157                         linux_thread_dtor_tag = EVENTHANDLER_REGISTER(thread_dtor,
 1158                             linux_thread_dtor, NULL, EVENTHANDLER_PRI_ANY);
 1159                         linux_get_machine(&linux_kplatform);
 1160                         linux_szplatform = roundup(strlen(linux_kplatform) + 1,
 1161                             sizeof(char *));
 1162                         linux_osd_jail_register();
 1163                         stclohz = (stathz ? stathz : hz);
 1164                         if (bootverbose)
 1165                                 printf("Linux ELF exec handler installed\n");
 1166                 } else
 1167                         printf("cannot insert Linux ELF brand handler\n");
 1168                 break;
 1169         case MOD_UNLOAD:
 1170                 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
 1171                      ++brandinfo)
 1172                         if (elf32_brand_inuse(*brandinfo))
 1173                                 error = EBUSY;
 1174                 if (error == 0) {
 1175                         for (brandinfo = &linux_brandlist[0];
 1176                              *brandinfo != NULL; ++brandinfo)
 1177                                 if (elf32_remove_brand_entry(*brandinfo) < 0)
 1178                                         error = EINVAL;
 1179                 }
 1180                 if (error == 0) {
 1181                         SET_FOREACH(lihp, linux_ioctl_handler_set)
 1182                                 linux_ioctl_unregister_handler(*lihp);
 1183                         mtx_destroy(&futex_mtx);
 1184                         EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag);
 1185                         EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag);
 1186                         EVENTHANDLER_DEREGISTER(thread_dtor, linux_thread_dtor_tag);
 1187                         linux_osd_jail_deregister();
 1188                         if (bootverbose)
 1189                                 printf("Linux ELF exec handler removed\n");
 1190                 } else
 1191                         printf("Could not deinstall ELF interpreter entry\n");
 1192                 break;
 1193         default:
 1194                 return (EOPNOTSUPP);
 1195         }
 1196         return (error);
 1197 }
 1198 
 1199 static moduledata_t linux_elf_mod = {
 1200         "linuxelf",
 1201         linux_elf_modevent,
 1202         0
 1203 };
 1204 
 1205 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
 1206 FEATURE(linux, "Linux 32bit support");

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