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/amd64/linux32/linux32_sysvec.c

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    1 /*-
    2  * Copyright (c) 2004 Tim J. Robbins
    3  * Copyright (c) 2003 Peter Wemm
    4  * Copyright (c) 2002 Doug Rabson
    5  * Copyright (c) 1998-1999 Andrew Gallatin
    6  * Copyright (c) 1994-1996 Søren Schmidt
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer
   14  *    in this position and unchanged.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. The name of the author may not be used to endorse or promote products
   19  *    derived from this software without specific prior written permission
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include "opt_compat.h"
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: stable/11/sys/amd64/linux32/linux32_sysvec.c 346835 2019-04-28 14:08:05Z dchagin $");
   37 #include "opt_compat.h"
   38 
   39 #ifndef COMPAT_FREEBSD32
   40 #error "Unable to compile Linux-emulator due to missing COMPAT_FREEBSD32 option!"
   41 #endif
   42 
   43 #define __ELF_WORD_SIZE 32
   44 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/exec.h>
   48 #include <sys/fcntl.h>
   49 #include <sys/imgact.h>
   50 #include <sys/imgact_elf.h>
   51 #include <sys/kernel.h>
   52 #include <sys/lock.h>
   53 #include <sys/malloc.h>
   54 #include <sys/module.h>
   55 #include <sys/mutex.h>
   56 #include <sys/proc.h>
   57 #include <sys/resourcevar.h>
   58 #include <sys/signalvar.h>
   59 #include <sys/syscallsubr.h>
   60 #include <sys/sysctl.h>
   61 #include <sys/sysent.h>
   62 #include <sys/sysproto.h>
   63 #include <sys/vnode.h>
   64 #include <sys/eventhandler.h>
   65 
   66 #include <vm/vm.h>
   67 #include <vm/pmap.h>
   68 #include <vm/vm_extern.h>
   69 #include <vm/vm_map.h>
   70 #include <vm/vm_object.h>
   71 #include <vm/vm_page.h>
   72 #include <vm/vm_param.h>
   73 
   74 #include <machine/cpu.h>
   75 #include <machine/md_var.h>
   76 #include <machine/pcb.h>
   77 #include <machine/specialreg.h>
   78 
   79 #include <amd64/linux32/linux.h>
   80 #include <amd64/linux32/linux32_proto.h>
   81 #include <compat/linux/linux_emul.h>
   82 #include <compat/linux/linux_futex.h>
   83 #include <compat/linux/linux_ioctl.h>
   84 #include <compat/linux/linux_mib.h>
   85 #include <compat/linux/linux_misc.h>
   86 #include <compat/linux/linux_signal.h>
   87 #include <compat/linux/linux_util.h>
   88 #include <compat/linux/linux_vdso.h>
   89 
   90 MODULE_VERSION(linux, 1);
   91 
   92 #define AUXARGS_ENTRY_32(pos, id, val)  \
   93         do {                            \
   94                 suword32(pos++, id);    \
   95                 suword32(pos++, val);   \
   96         } while (0)
   97 
   98 /*
   99  * Allow the sendsig functions to use the ldebug() facility even though they
  100  * are not syscalls themselves.  Map them to syscall 0.  This is slightly less
  101  * bogus than using ldebug(sigreturn).
  102  */
  103 #define LINUX32_SYS_linux_rt_sendsig    0
  104 #define LINUX32_SYS_linux_sendsig       0
  105 
  106 const char *linux_kplatform;
  107 static int linux_szsigcode;
  108 static vm_object_t linux_shared_page_obj;
  109 static char *linux_shared_page_mapping;
  110 extern char _binary_linux32_locore_o_start;
  111 extern char _binary_linux32_locore_o_end;
  112 
  113 extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL];
  114 
  115 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
  116 
  117 static int      linux_fixup_elf(register_t **stack_base,
  118                     struct image_params *iparams);
  119 static register_t *linux_copyout_strings(struct image_params *imgp);
  120 static void     linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
  121 static void     linux_exec_setregs(struct thread *td,
  122                                    struct image_params *imgp, u_long stack);
  123 static void     linux32_fixlimit(struct rlimit *rl, int which);
  124 static bool     linux32_trans_osrel(const Elf_Note *note, int32_t *osrel);
  125 static void     linux_vdso_install(void *param);
  126 static void     linux_vdso_deinstall(void *param);
  127 
  128 #define LINUX_T_UNKNOWN  255
  129 static int _bsd_to_linux_trapcode[] = {
  130         LINUX_T_UNKNOWN,        /* 0 */
  131         6,                      /* 1  T_PRIVINFLT */
  132         LINUX_T_UNKNOWN,        /* 2 */
  133         3,                      /* 3  T_BPTFLT */
  134         LINUX_T_UNKNOWN,        /* 4 */
  135         LINUX_T_UNKNOWN,        /* 5 */
  136         16,                     /* 6  T_ARITHTRAP */
  137         254,                    /* 7  T_ASTFLT */
  138         LINUX_T_UNKNOWN,        /* 8 */
  139         13,                     /* 9  T_PROTFLT */
  140         1,                      /* 10 T_TRCTRAP */
  141         LINUX_T_UNKNOWN,        /* 11 */
  142         14,                     /* 12 T_PAGEFLT */
  143         LINUX_T_UNKNOWN,        /* 13 */
  144         17,                     /* 14 T_ALIGNFLT */
  145         LINUX_T_UNKNOWN,        /* 15 */
  146         LINUX_T_UNKNOWN,        /* 16 */
  147         LINUX_T_UNKNOWN,        /* 17 */
  148         0,                      /* 18 T_DIVIDE */
  149         2,                      /* 19 T_NMI */
  150         4,                      /* 20 T_OFLOW */
  151         5,                      /* 21 T_BOUND */
  152         7,                      /* 22 T_DNA */
  153         8,                      /* 23 T_DOUBLEFLT */
  154         9,                      /* 24 T_FPOPFLT */
  155         10,                     /* 25 T_TSSFLT */
  156         11,                     /* 26 T_SEGNPFLT */
  157         12,                     /* 27 T_STKFLT */
  158         18,                     /* 28 T_MCHK */
  159         19,                     /* 29 T_XMMFLT */
  160         15                      /* 30 T_RESERVED */
  161 };
  162 #define bsd_to_linux_trapcode(code) \
  163     ((code)<nitems(_bsd_to_linux_trapcode)? \
  164      _bsd_to_linux_trapcode[(code)]: \
  165      LINUX_T_UNKNOWN)
  166 
  167 struct linux32_ps_strings {
  168         u_int32_t ps_argvstr;   /* first of 0 or more argument strings */
  169         u_int ps_nargvstr;      /* the number of argument strings */
  170         u_int32_t ps_envstr;    /* first of 0 or more environment strings */
  171         u_int ps_nenvstr;       /* the number of environment strings */
  172 };
  173 
  174 LINUX_VDSO_SYM_INTPTR(linux32_sigcode);
  175 LINUX_VDSO_SYM_INTPTR(linux32_rt_sigcode);
  176 LINUX_VDSO_SYM_INTPTR(linux32_vsyscall);
  177 LINUX_VDSO_SYM_CHAR(linux_platform);
  178 
  179 /*
  180  * If FreeBSD & Linux have a difference of opinion about what a trap
  181  * means, deal with it here.
  182  *
  183  * MPSAFE
  184  */
  185 static int
  186 linux_translate_traps(int signal, int trap_code)
  187 {
  188         if (signal != SIGBUS)
  189                 return (signal);
  190         switch (trap_code) {
  191         case T_PROTFLT:
  192         case T_TSSFLT:
  193         case T_DOUBLEFLT:
  194         case T_PAGEFLT:
  195                 return (SIGSEGV);
  196         default:
  197                 return (signal);
  198         }
  199 }
  200 
  201 static int
  202 linux_fixup_elf(register_t **stack_base, struct image_params *imgp)
  203 {
  204         Elf32_Auxargs *args;
  205         Elf32_Addr *base;
  206         Elf32_Addr *pos;
  207         struct linux32_ps_strings *arginfo;
  208         int issetugid;
  209 
  210         arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS;
  211 
  212         KASSERT(curthread->td_proc == imgp->proc,
  213             ("unsafe linux_fixup_elf(), should be curproc"));
  214         base = (Elf32_Addr *)*stack_base;
  215         args = (Elf32_Auxargs *)imgp->auxargs;
  216         pos = base + (imgp->args->argc + imgp->args->envc + 2);
  217 
  218         issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
  219         AUXARGS_ENTRY_32(pos, LINUX_AT_SYSINFO_EHDR,
  220             imgp->proc->p_sysent->sv_shared_page_base);
  221         AUXARGS_ENTRY_32(pos, LINUX_AT_SYSINFO, linux32_vsyscall);
  222         AUXARGS_ENTRY_32(pos, LINUX_AT_HWCAP, cpu_feature);
  223 
  224         /*
  225          * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0,
  226          * as it has appeared in the 2.4.0-rc7 first time.
  227          * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK),
  228          * glibc falls back to the hard-coded CLK_TCK value when aux entry
  229          * is not present.
  230          * Also see linux_times() implementation.
  231          */
  232         if (linux_kernver(curthread) >= LINUX_KERNVER_2004000)
  233                 AUXARGS_ENTRY_32(pos, LINUX_AT_CLKTCK, stclohz);
  234         AUXARGS_ENTRY_32(pos, AT_PHDR, args->phdr);
  235         AUXARGS_ENTRY_32(pos, AT_PHENT, args->phent);
  236         AUXARGS_ENTRY_32(pos, AT_PHNUM, args->phnum);
  237         AUXARGS_ENTRY_32(pos, AT_PAGESZ, args->pagesz);
  238         AUXARGS_ENTRY_32(pos, AT_FLAGS, args->flags);
  239         AUXARGS_ENTRY_32(pos, AT_ENTRY, args->entry);
  240         AUXARGS_ENTRY_32(pos, AT_BASE, args->base);
  241         AUXARGS_ENTRY_32(pos, LINUX_AT_SECURE, issetugid);
  242         AUXARGS_ENTRY_32(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
  243         AUXARGS_ENTRY_32(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
  244         AUXARGS_ENTRY_32(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
  245         AUXARGS_ENTRY_32(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
  246         AUXARGS_ENTRY_32(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
  247         AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary));
  248         if (imgp->execpathp != 0)
  249                 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp));
  250         if (args->execfd != -1)
  251                 AUXARGS_ENTRY_32(pos, AT_EXECFD, args->execfd);
  252         AUXARGS_ENTRY_32(pos, AT_NULL, 0);
  253 
  254         free(imgp->auxargs, M_TEMP);
  255         imgp->auxargs = NULL;
  256 
  257         base--;
  258         suword32(base, (uint32_t)imgp->args->argc);
  259         *stack_base = (register_t *)base;
  260         return (0);
  261 }
  262 
  263 static void
  264 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  265 {
  266         struct thread *td = curthread;
  267         struct proc *p = td->td_proc;
  268         struct sigacts *psp;
  269         struct trapframe *regs;
  270         struct l_rt_sigframe *fp, frame;
  271         int oonstack;
  272         int sig;
  273         int code;
  274 
  275         sig = ksi->ksi_signo;
  276         code = ksi->ksi_code;
  277         PROC_LOCK_ASSERT(p, MA_OWNED);
  278         psp = p->p_sigacts;
  279         mtx_assert(&psp->ps_mtx, MA_OWNED);
  280         regs = td->td_frame;
  281         oonstack = sigonstack(regs->tf_rsp);
  282 
  283 #ifdef DEBUG
  284         if (ldebug(rt_sendsig))
  285                 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"),
  286                     catcher, sig, (void*)mask, code);
  287 #endif
  288         /* Allocate space for the signal handler context. */
  289         if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
  290             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  291                 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
  292                     td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
  293         } else
  294                 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1;
  295         mtx_unlock(&psp->ps_mtx);
  296 
  297         /* Build the argument list for the signal handler. */
  298         sig = bsd_to_linux_signal(sig);
  299 
  300         bzero(&frame, sizeof(frame));
  301 
  302         frame.sf_handler = PTROUT(catcher);
  303         frame.sf_sig = sig;
  304         frame.sf_siginfo = PTROUT(&fp->sf_si);
  305         frame.sf_ucontext = PTROUT(&fp->sf_sc);
  306 
  307         /* Fill in POSIX parts. */
  308         ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig);
  309 
  310         /*
  311          * Build the signal context to be used by sigreturn and libgcc unwind.
  312          */
  313         frame.sf_sc.uc_flags = 0;               /* XXX ??? */
  314         frame.sf_sc.uc_link = 0;                /* XXX ??? */
  315 
  316         frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
  317         frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
  318         frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
  319             ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
  320         PROC_UNLOCK(p);
  321 
  322         bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask);
  323 
  324         frame.sf_sc.uc_mcontext.sc_mask   = frame.sf_sc.uc_sigmask.__mask;
  325         frame.sf_sc.uc_mcontext.sc_edi    = regs->tf_rdi;
  326         frame.sf_sc.uc_mcontext.sc_esi    = regs->tf_rsi;
  327         frame.sf_sc.uc_mcontext.sc_ebp    = regs->tf_rbp;
  328         frame.sf_sc.uc_mcontext.sc_ebx    = regs->tf_rbx;
  329         frame.sf_sc.uc_mcontext.sc_esp    = regs->tf_rsp;
  330         frame.sf_sc.uc_mcontext.sc_edx    = regs->tf_rdx;
  331         frame.sf_sc.uc_mcontext.sc_ecx    = regs->tf_rcx;
  332         frame.sf_sc.uc_mcontext.sc_eax    = regs->tf_rax;
  333         frame.sf_sc.uc_mcontext.sc_eip    = regs->tf_rip;
  334         frame.sf_sc.uc_mcontext.sc_cs     = regs->tf_cs;
  335         frame.sf_sc.uc_mcontext.sc_gs     = regs->tf_gs;
  336         frame.sf_sc.uc_mcontext.sc_fs     = regs->tf_fs;
  337         frame.sf_sc.uc_mcontext.sc_es     = regs->tf_es;
  338         frame.sf_sc.uc_mcontext.sc_ds     = regs->tf_ds;
  339         frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags;
  340         frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp;
  341         frame.sf_sc.uc_mcontext.sc_ss     = regs->tf_ss;
  342         frame.sf_sc.uc_mcontext.sc_err    = regs->tf_err;
  343         frame.sf_sc.uc_mcontext.sc_cr2    = (u_int32_t)(uintptr_t)ksi->ksi_addr;
  344         frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
  345 
  346 #ifdef DEBUG
  347         if (ldebug(rt_sendsig))
  348                 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"),
  349                     frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp,
  350                     td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask);
  351 #endif
  352 
  353         if (copyout(&frame, fp, sizeof(frame)) != 0) {
  354                 /*
  355                  * Process has trashed its stack; give it an illegal
  356                  * instruction to halt it in its tracks.
  357                  */
  358 #ifdef DEBUG
  359                 if (ldebug(rt_sendsig))
  360                         printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"),
  361                             fp, oonstack);
  362 #endif
  363                 PROC_LOCK(p);
  364                 sigexit(td, SIGILL);
  365         }
  366 
  367         /* Build context to run handler in. */
  368         regs->tf_rsp = PTROUT(fp);
  369         regs->tf_rip = linux32_rt_sigcode;
  370         regs->tf_rflags &= ~(PSL_T | PSL_D);
  371         regs->tf_cs = _ucode32sel;
  372         regs->tf_ss = _udatasel;
  373         regs->tf_ds = _udatasel;
  374         regs->tf_es = _udatasel;
  375         regs->tf_fs = _ufssel;
  376         regs->tf_gs = _ugssel;
  377         regs->tf_flags = TF_HASSEGS;
  378         set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
  379         PROC_LOCK(p);
  380         mtx_lock(&psp->ps_mtx);
  381 }
  382 
  383 
  384 /*
  385  * Send an interrupt to process.
  386  *
  387  * Stack is set up to allow sigcode stored
  388  * in u. to call routine, followed by kcall
  389  * to sigreturn routine below.  After sigreturn
  390  * resets the signal mask, the stack, and the
  391  * frame pointer, it returns to the user
  392  * specified pc, psl.
  393  */
  394 static void
  395 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  396 {
  397         struct thread *td = curthread;
  398         struct proc *p = td->td_proc;
  399         struct sigacts *psp;
  400         struct trapframe *regs;
  401         struct l_sigframe *fp, frame;
  402         l_sigset_t lmask;
  403         int oonstack;
  404         int sig, code;
  405 
  406         sig = ksi->ksi_signo;
  407         code = ksi->ksi_code;
  408         PROC_LOCK_ASSERT(p, MA_OWNED);
  409         psp = p->p_sigacts;
  410         mtx_assert(&psp->ps_mtx, MA_OWNED);
  411         if (SIGISMEMBER(psp->ps_siginfo, sig)) {
  412                 /* Signal handler installed with SA_SIGINFO. */
  413                 linux_rt_sendsig(catcher, ksi, mask);
  414                 return;
  415         }
  416 
  417         regs = td->td_frame;
  418         oonstack = sigonstack(regs->tf_rsp);
  419 
  420 #ifdef DEBUG
  421         if (ldebug(sendsig))
  422                 printf(ARGS(sendsig, "%p, %d, %p, %u"),
  423                     catcher, sig, (void*)mask, code);
  424 #endif
  425 
  426         /* Allocate space for the signal handler context. */
  427         if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
  428             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  429                 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
  430                     td->td_sigstk.ss_size - sizeof(struct l_sigframe));
  431         } else
  432                 fp = (struct l_sigframe *)regs->tf_rsp - 1;
  433         mtx_unlock(&psp->ps_mtx);
  434         PROC_UNLOCK(p);
  435 
  436         /* Build the argument list for the signal handler. */
  437         sig = bsd_to_linux_signal(sig);
  438 
  439         bzero(&frame, sizeof(frame));
  440 
  441         frame.sf_handler = PTROUT(catcher);
  442         frame.sf_sig = sig;
  443 
  444         bsd_to_linux_sigset(mask, &lmask);
  445 
  446         /* Build the signal context to be used by sigreturn. */
  447         frame.sf_sc.sc_mask   = lmask.__mask;
  448         frame.sf_sc.sc_gs     = regs->tf_gs;
  449         frame.sf_sc.sc_fs     = regs->tf_fs;
  450         frame.sf_sc.sc_es     = regs->tf_es;
  451         frame.sf_sc.sc_ds     = regs->tf_ds;
  452         frame.sf_sc.sc_edi    = regs->tf_rdi;
  453         frame.sf_sc.sc_esi    = regs->tf_rsi;
  454         frame.sf_sc.sc_ebp    = regs->tf_rbp;
  455         frame.sf_sc.sc_ebx    = regs->tf_rbx;
  456         frame.sf_sc.sc_esp    = regs->tf_rsp;
  457         frame.sf_sc.sc_edx    = regs->tf_rdx;
  458         frame.sf_sc.sc_ecx    = regs->tf_rcx;
  459         frame.sf_sc.sc_eax    = regs->tf_rax;
  460         frame.sf_sc.sc_eip    = regs->tf_rip;
  461         frame.sf_sc.sc_cs     = regs->tf_cs;
  462         frame.sf_sc.sc_eflags = regs->tf_rflags;
  463         frame.sf_sc.sc_esp_at_signal = regs->tf_rsp;
  464         frame.sf_sc.sc_ss     = regs->tf_ss;
  465         frame.sf_sc.sc_err    = regs->tf_err;
  466         frame.sf_sc.sc_cr2    = (u_int32_t)(uintptr_t)ksi->ksi_addr;
  467         frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code);
  468 
  469         frame.sf_extramask[0] = lmask.__mask;
  470 
  471         if (copyout(&frame, fp, sizeof(frame)) != 0) {
  472                 /*
  473                  * Process has trashed its stack; give it an illegal
  474                  * instruction to halt it in its tracks.
  475                  */
  476                 PROC_LOCK(p);
  477                 sigexit(td, SIGILL);
  478         }
  479 
  480         /* Build context to run handler in. */
  481         regs->tf_rsp = PTROUT(fp);
  482         regs->tf_rip = linux32_sigcode;
  483         regs->tf_rflags &= ~(PSL_T | PSL_D);
  484         regs->tf_cs = _ucode32sel;
  485         regs->tf_ss = _udatasel;
  486         regs->tf_ds = _udatasel;
  487         regs->tf_es = _udatasel;
  488         regs->tf_fs = _ufssel;
  489         regs->tf_gs = _ugssel;
  490         regs->tf_flags = TF_HASSEGS;
  491         set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
  492         PROC_LOCK(p);
  493         mtx_lock(&psp->ps_mtx);
  494 }
  495 
  496 /*
  497  * System call to cleanup state after a signal
  498  * has been taken.  Reset signal mask and
  499  * stack state from context left by sendsig (above).
  500  * Return to previous pc and psl as specified by
  501  * context left by sendsig. Check carefully to
  502  * make sure that the user has not modified the
  503  * psl to gain improper privileges or to cause
  504  * a machine fault.
  505  */
  506 int
  507 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
  508 {
  509         struct l_sigframe frame;
  510         struct trapframe *regs;
  511         sigset_t bmask;
  512         l_sigset_t lmask;
  513         int eflags;
  514         ksiginfo_t ksi;
  515 
  516         regs = td->td_frame;
  517 
  518 #ifdef DEBUG
  519         if (ldebug(sigreturn))
  520                 printf(ARGS(sigreturn, "%p"), (void *)args->sfp);
  521 #endif
  522         /*
  523          * The trampoline code hands us the sigframe.
  524          * It is unsafe to keep track of it ourselves, in the event that a
  525          * program jumps out of a signal handler.
  526          */
  527         if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
  528                 return (EFAULT);
  529 
  530         /* Check for security violations. */
  531 #define EFLAGS_SECURE(ef, oef)  ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
  532         eflags = frame.sf_sc.sc_eflags;
  533         if (!EFLAGS_SECURE(eflags, regs->tf_rflags))
  534                 return(EINVAL);
  535 
  536         /*
  537          * Don't allow users to load a valid privileged %cs.  Let the
  538          * hardware check for invalid selectors, excess privilege in
  539          * other selectors, invalid %eip's and invalid %esp's.
  540          */
  541 #define CS_SECURE(cs)   (ISPL(cs) == SEL_UPL)
  542         if (!CS_SECURE(frame.sf_sc.sc_cs)) {
  543                 ksiginfo_init_trap(&ksi);
  544                 ksi.ksi_signo = SIGBUS;
  545                 ksi.ksi_code = BUS_OBJERR;
  546                 ksi.ksi_trapno = T_PROTFLT;
  547                 ksi.ksi_addr = (void *)regs->tf_rip;
  548                 trapsignal(td, &ksi);
  549                 return(EINVAL);
  550         }
  551 
  552         lmask.__mask = frame.sf_sc.sc_mask;
  553         lmask.__mask = frame.sf_extramask[0];
  554         linux_to_bsd_sigset(&lmask, &bmask);
  555         kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
  556 
  557         /* Restore signal context. */
  558         regs->tf_rdi    = frame.sf_sc.sc_edi;
  559         regs->tf_rsi    = frame.sf_sc.sc_esi;
  560         regs->tf_rbp    = frame.sf_sc.sc_ebp;
  561         regs->tf_rbx    = frame.sf_sc.sc_ebx;
  562         regs->tf_rdx    = frame.sf_sc.sc_edx;
  563         regs->tf_rcx    = frame.sf_sc.sc_ecx;
  564         regs->tf_rax    = frame.sf_sc.sc_eax;
  565         regs->tf_rip    = frame.sf_sc.sc_eip;
  566         regs->tf_cs     = frame.sf_sc.sc_cs;
  567         regs->tf_ds     = frame.sf_sc.sc_ds;
  568         regs->tf_es     = frame.sf_sc.sc_es;
  569         regs->tf_fs     = frame.sf_sc.sc_fs;
  570         regs->tf_gs     = frame.sf_sc.sc_gs;
  571         regs->tf_rflags = eflags;
  572         regs->tf_rsp    = frame.sf_sc.sc_esp_at_signal;
  573         regs->tf_ss     = frame.sf_sc.sc_ss;
  574         set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
  575 
  576         return (EJUSTRETURN);
  577 }
  578 
  579 /*
  580  * System call to cleanup state after a signal
  581  * has been taken.  Reset signal mask and
  582  * stack state from context left by rt_sendsig (above).
  583  * Return to previous pc and psl as specified by
  584  * context left by sendsig. Check carefully to
  585  * make sure that the user has not modified the
  586  * psl to gain improper privileges or to cause
  587  * a machine fault.
  588  */
  589 int
  590 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
  591 {
  592         struct l_ucontext uc;
  593         struct l_sigcontext *context;
  594         sigset_t bmask;
  595         l_stack_t *lss;
  596         stack_t ss;
  597         struct trapframe *regs;
  598         int eflags;
  599         ksiginfo_t ksi;
  600 
  601         regs = td->td_frame;
  602 
  603 #ifdef DEBUG
  604         if (ldebug(rt_sigreturn))
  605                 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp);
  606 #endif
  607         /*
  608          * The trampoline code hands us the ucontext.
  609          * It is unsafe to keep track of it ourselves, in the event that a
  610          * program jumps out of a signal handler.
  611          */
  612         if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
  613                 return (EFAULT);
  614 
  615         context = &uc.uc_mcontext;
  616 
  617         /* Check for security violations. */
  618 #define EFLAGS_SECURE(ef, oef)  ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
  619         eflags = context->sc_eflags;
  620         if (!EFLAGS_SECURE(eflags, regs->tf_rflags))
  621                 return(EINVAL);
  622 
  623         /*
  624          * Don't allow users to load a valid privileged %cs.  Let the
  625          * hardware check for invalid selectors, excess privilege in
  626          * other selectors, invalid %eip's and invalid %esp's.
  627          */
  628 #define CS_SECURE(cs)   (ISPL(cs) == SEL_UPL)
  629         if (!CS_SECURE(context->sc_cs)) {
  630                 ksiginfo_init_trap(&ksi);
  631                 ksi.ksi_signo = SIGBUS;
  632                 ksi.ksi_code = BUS_OBJERR;
  633                 ksi.ksi_trapno = T_PROTFLT;
  634                 ksi.ksi_addr = (void *)regs->tf_rip;
  635                 trapsignal(td, &ksi);
  636                 return(EINVAL);
  637         }
  638 
  639         linux_to_bsd_sigset(&uc.uc_sigmask, &bmask);
  640         kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
  641 
  642         /*
  643          * Restore signal context
  644          */
  645         regs->tf_gs     = context->sc_gs;
  646         regs->tf_fs     = context->sc_fs;
  647         regs->tf_es     = context->sc_es;
  648         regs->tf_ds     = context->sc_ds;
  649         regs->tf_rdi    = context->sc_edi;
  650         regs->tf_rsi    = context->sc_esi;
  651         regs->tf_rbp    = context->sc_ebp;
  652         regs->tf_rbx    = context->sc_ebx;
  653         regs->tf_rdx    = context->sc_edx;
  654         regs->tf_rcx    = context->sc_ecx;
  655         regs->tf_rax    = context->sc_eax;
  656         regs->tf_rip    = context->sc_eip;
  657         regs->tf_cs     = context->sc_cs;
  658         regs->tf_rflags = eflags;
  659         regs->tf_rsp    = context->sc_esp_at_signal;
  660         regs->tf_ss     = context->sc_ss;
  661         set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
  662 
  663         /*
  664          * call sigaltstack & ignore results..
  665          */
  666         lss = &uc.uc_stack;
  667         ss.ss_sp = PTRIN(lss->ss_sp);
  668         ss.ss_size = lss->ss_size;
  669         ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
  670 
  671 #ifdef DEBUG
  672         if (ldebug(rt_sigreturn))
  673                 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"),
  674                     ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask);
  675 #endif
  676         (void)kern_sigaltstack(td, &ss, NULL);
  677 
  678         return (EJUSTRETURN);
  679 }
  680 
  681 static int
  682 linux32_fetch_syscall_args(struct thread *td)
  683 {
  684         struct proc *p;
  685         struct trapframe *frame;
  686         struct syscall_args *sa;
  687 
  688         p = td->td_proc;
  689         frame = td->td_frame;
  690         sa = &td->td_sa;
  691 
  692         sa->args[0] = frame->tf_rbx;
  693         sa->args[1] = frame->tf_rcx;
  694         sa->args[2] = frame->tf_rdx;
  695         sa->args[3] = frame->tf_rsi;
  696         sa->args[4] = frame->tf_rdi;
  697         sa->args[5] = frame->tf_rbp;    /* Unconfirmed */
  698         sa->code = frame->tf_rax;
  699 
  700         if (sa->code >= p->p_sysent->sv_size)
  701                 /* nosys */
  702                 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1];
  703         else
  704                 sa->callp = &p->p_sysent->sv_table[sa->code];
  705         sa->narg = sa->callp->sy_narg;
  706 
  707         td->td_retval[0] = 0;
  708         td->td_retval[1] = frame->tf_rdx;
  709 
  710         return (0);
  711 }
  712 
  713 /*
  714  * Clear registers on exec
  715  * XXX copied from ia32_signal.c.
  716  */
  717 static void
  718 linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
  719 {
  720         struct trapframe *regs = td->td_frame;
  721         struct pcb *pcb = td->td_pcb;
  722         register_t saved_rflags;
  723 
  724         regs = td->td_frame;
  725         pcb = td->td_pcb;
  726 
  727         mtx_lock(&dt_lock);
  728         if (td->td_proc->p_md.md_ldt != NULL)
  729                 user_ldt_free(td);
  730         else
  731                 mtx_unlock(&dt_lock);
  732 
  733         critical_enter();
  734         wrmsr(MSR_FSBASE, 0);
  735         wrmsr(MSR_KGSBASE, 0);  /* User value while we're in the kernel */
  736         pcb->pcb_fsbase = 0;
  737         pcb->pcb_gsbase = 0;
  738         critical_exit();
  739         pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
  740 
  741         saved_rflags = regs->tf_rflags & PSL_T;
  742         bzero((char *)regs, sizeof(struct trapframe));
  743         regs->tf_rip = imgp->entry_addr;
  744         regs->tf_rsp = stack;
  745         regs->tf_rflags = PSL_USER | saved_rflags;
  746         regs->tf_gs = _ugssel;
  747         regs->tf_fs = _ufssel;
  748         regs->tf_es = _udatasel;
  749         regs->tf_ds = _udatasel;
  750         regs->tf_ss = _udatasel;
  751         regs->tf_flags = TF_HASSEGS;
  752         regs->tf_cs = _ucode32sel;
  753         regs->tf_rbx = imgp->ps_strings;
  754 
  755         fpstate_drop(td);
  756 
  757         /* Do full restore on return so that we can change to a different %cs */
  758         set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET);
  759         td->td_retval[1] = 0;
  760 }
  761 
  762 /*
  763  * XXX copied from ia32_sysvec.c.
  764  */
  765 static register_t *
  766 linux_copyout_strings(struct image_params *imgp)
  767 {
  768         int argc, envc;
  769         u_int32_t *vectp;
  770         char *stringp, *destp;
  771         u_int32_t *stack_base;
  772         struct linux32_ps_strings *arginfo;
  773         char canary[LINUX_AT_RANDOM_LEN];
  774         size_t execpath_len;
  775 
  776         /* Calculate string base and vector table pointers. */
  777         if (imgp->execpath != NULL && imgp->auxargs != NULL)
  778                 execpath_len = strlen(imgp->execpath) + 1;
  779         else
  780                 execpath_len = 0;
  781 
  782         arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS;
  783         destp = (caddr_t)arginfo - SPARE_USRSPACE -
  784             roundup(sizeof(canary), sizeof(char *)) -
  785             roundup(execpath_len, sizeof(char *)) -
  786             roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *));
  787 
  788         if (execpath_len != 0) {
  789                 imgp->execpathp = (uintptr_t)arginfo - execpath_len;
  790                 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len);
  791         }
  792 
  793         /* Prepare the canary for SSP. */
  794         arc4rand(canary, sizeof(canary), 0);
  795         imgp->canary = (uintptr_t)arginfo -
  796             roundup(execpath_len, sizeof(char *)) -
  797             roundup(sizeof(canary), sizeof(char *));
  798         copyout(canary, (void *)imgp->canary, sizeof(canary));
  799 
  800         vectp = (uint32_t *)destp;
  801         if (imgp->auxargs) {
  802                 /*
  803                  * Allocate room on the stack for the ELF auxargs
  804                  * array.  It has LINUX_AT_COUNT entries.
  805                  */
  806                 vectp -= howmany(LINUX_AT_COUNT * sizeof(Elf32_Auxinfo),
  807                     sizeof(*vectp));
  808         }
  809 
  810         /*
  811          * Allocate room for the argv[] and env vectors including the
  812          * terminating NULL pointers.
  813          */
  814         vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
  815 
  816         /* vectp also becomes our initial stack base. */
  817         stack_base = vectp;
  818 
  819         stringp = imgp->args->begin_argv;
  820         argc = imgp->args->argc;
  821         envc = imgp->args->envc;
  822         /* Copy out strings - arguments and environment. */
  823         copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
  824 
  825         /* Fill in "ps_strings" struct for ps, w, etc. */
  826         suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp);
  827         suword32(&arginfo->ps_nargvstr, argc);
  828 
  829         /* Fill in argument portion of vector table. */
  830         for (; argc > 0; --argc) {
  831                 suword32(vectp++, (uint32_t)(intptr_t)destp);
  832                 while (*stringp++ != 0)
  833                         destp++;
  834                 destp++;
  835         }
  836 
  837         /* A null vector table pointer separates the argp's from the envp's. */
  838         suword32(vectp++, 0);
  839 
  840         suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp);
  841         suword32(&arginfo->ps_nenvstr, envc);
  842 
  843         /* Fill in environment portion of vector table. */
  844         for (; envc > 0; --envc) {
  845                 suword32(vectp++, (uint32_t)(intptr_t)destp);
  846                 while (*stringp++ != 0)
  847                         destp++;
  848                 destp++;
  849         }
  850 
  851         /* The end of the vector table is a null pointer. */
  852         suword32(vectp, 0);
  853 
  854         return ((register_t *)stack_base);
  855 }
  856 
  857 static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW, 0,
  858     "32-bit Linux emulation");
  859 
  860 static u_long   linux32_maxdsiz = LINUX32_MAXDSIZ;
  861 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW,
  862     &linux32_maxdsiz, 0, "");
  863 static u_long   linux32_maxssiz = LINUX32_MAXSSIZ;
  864 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW,
  865     &linux32_maxssiz, 0, "");
  866 static u_long   linux32_maxvmem = LINUX32_MAXVMEM;
  867 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW,
  868     &linux32_maxvmem, 0, "");
  869 
  870 #if defined(DEBUG)
  871 SYSCTL_PROC(_compat_linux32, OID_AUTO, debug, CTLTYPE_STRING | CTLFLAG_RW, 0, 0,
  872     linux_sysctl_debug, "A", "Linux debugging control");
  873 #endif
  874 
  875 static void
  876 linux32_fixlimit(struct rlimit *rl, int which)
  877 {
  878 
  879         switch (which) {
  880         case RLIMIT_DATA:
  881                 if (linux32_maxdsiz != 0) {
  882                         if (rl->rlim_cur > linux32_maxdsiz)
  883                                 rl->rlim_cur = linux32_maxdsiz;
  884                         if (rl->rlim_max > linux32_maxdsiz)
  885                                 rl->rlim_max = linux32_maxdsiz;
  886                 }
  887                 break;
  888         case RLIMIT_STACK:
  889                 if (linux32_maxssiz != 0) {
  890                         if (rl->rlim_cur > linux32_maxssiz)
  891                                 rl->rlim_cur = linux32_maxssiz;
  892                         if (rl->rlim_max > linux32_maxssiz)
  893                                 rl->rlim_max = linux32_maxssiz;
  894                 }
  895                 break;
  896         case RLIMIT_VMEM:
  897                 if (linux32_maxvmem != 0) {
  898                         if (rl->rlim_cur > linux32_maxvmem)
  899                                 rl->rlim_cur = linux32_maxvmem;
  900                         if (rl->rlim_max > linux32_maxvmem)
  901                                 rl->rlim_max = linux32_maxvmem;
  902                 }
  903                 break;
  904         }
  905 }
  906 
  907 struct sysentvec elf_linux_sysvec = {
  908         .sv_size        = LINUX32_SYS_MAXSYSCALL,
  909         .sv_table       = linux32_sysent,
  910         .sv_mask        = 0,
  911         .sv_errsize     = ELAST + 1,
  912         .sv_errtbl      = linux_errtbl,
  913         .sv_transtrap   = linux_translate_traps,
  914         .sv_fixup       = linux_fixup_elf,
  915         .sv_sendsig     = linux_sendsig,
  916         .sv_sigcode     = &_binary_linux32_locore_o_start,
  917         .sv_szsigcode   = &linux_szsigcode,
  918         .sv_name        = "Linux ELF32",
  919         .sv_coredump    = elf32_coredump,
  920         .sv_imgact_try  = linux_exec_imgact_try,
  921         .sv_minsigstksz = LINUX_MINSIGSTKSZ,
  922         .sv_pagesize    = PAGE_SIZE,
  923         .sv_minuser     = VM_MIN_ADDRESS,
  924         .sv_maxuser     = LINUX32_MAXUSER,
  925         .sv_usrstack    = LINUX32_USRSTACK,
  926         .sv_psstrings   = LINUX32_PS_STRINGS,
  927         .sv_stackprot   = VM_PROT_ALL,
  928         .sv_copyout_strings = linux_copyout_strings,
  929         .sv_setregs     = linux_exec_setregs,
  930         .sv_fixlimit    = linux32_fixlimit,
  931         .sv_maxssiz     = &linux32_maxssiz,
  932         .sv_flags       = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP,
  933         .sv_set_syscall_retval = cpu_set_syscall_retval,
  934         .sv_fetch_syscall_args = linux32_fetch_syscall_args,
  935         .sv_syscallnames = NULL,
  936         .sv_shared_page_base = LINUX32_SHAREDPAGE,
  937         .sv_shared_page_len = PAGE_SIZE,
  938         .sv_schedtail   = linux_schedtail,
  939         .sv_thread_detach = linux_thread_detach,
  940         .sv_trap        = NULL,
  941 };
  942 
  943 static void
  944 linux_vdso_install(void *param)
  945 {
  946 
  947         linux_szsigcode = (&_binary_linux32_locore_o_end -
  948             &_binary_linux32_locore_o_start);
  949 
  950         if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
  951                 panic("Linux invalid vdso size\n");
  952 
  953         __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
  954 
  955         linux_shared_page_obj = __elfN(linux_shared_page_init)
  956             (&linux_shared_page_mapping);
  957 
  958         __elfN(linux_vdso_reloc)(&elf_linux_sysvec);
  959 
  960         bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
  961             linux_szsigcode);
  962         elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
  963 
  964         linux_kplatform = linux_shared_page_mapping +
  965             (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base);
  966 }
  967 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
  968     linux_vdso_install, NULL);
  969 
  970 static void
  971 linux_vdso_deinstall(void *param)
  972 {
  973 
  974         __elfN(linux_shared_page_fini)(linux_shared_page_obj);
  975 }
  976 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
  977     linux_vdso_deinstall, NULL);
  978 
  979 static char GNU_ABI_VENDOR[] = "GNU";
  980 static int GNULINUX_ABI_DESC = 0;
  981 
  982 static bool
  983 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel)
  984 {
  985         const Elf32_Word *desc;
  986         uintptr_t p;
  987 
  988         p = (uintptr_t)(note + 1);
  989         p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
  990 
  991         desc = (const Elf32_Word *)p;
  992         if (desc[0] != GNULINUX_ABI_DESC)
  993                 return (false);
  994 
  995         /*
  996          * For Linux we encode osrel using the Linux convention of
  997          *      (version << 16) | (major << 8) | (minor)
  998          * See macro in linux_mib.h
  999          */
 1000         *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]);
 1001 
 1002         return (true);
 1003 }
 1004 
 1005 static Elf_Brandnote linux32_brandnote = {
 1006         .hdr.n_namesz   = sizeof(GNU_ABI_VENDOR),
 1007         .hdr.n_descsz   = 16,   /* XXX at least 16 */
 1008         .hdr.n_type     = 1,
 1009         .vendor         = GNU_ABI_VENDOR,
 1010         .flags          = BN_TRANSLATE_OSREL,
 1011         .trans_osrel    = linux32_trans_osrel
 1012 };
 1013 
 1014 static Elf32_Brandinfo linux_brand = {
 1015         .brand          = ELFOSABI_LINUX,
 1016         .machine        = EM_386,
 1017         .compat_3_brand = "Linux",
 1018         .emul_path      = "/compat/linux",
 1019         .interp_path    = "/lib/ld-linux.so.1",
 1020         .sysvec         = &elf_linux_sysvec,
 1021         .interp_newpath = NULL,
 1022         .brand_note     = &linux32_brandnote,
 1023         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 1024 };
 1025 
 1026 static Elf32_Brandinfo linux_glibc2brand = {
 1027         .brand          = ELFOSABI_LINUX,
 1028         .machine        = EM_386,
 1029         .compat_3_brand = "Linux",
 1030         .emul_path      = "/compat/linux",
 1031         .interp_path    = "/lib/ld-linux.so.2",
 1032         .sysvec         = &elf_linux_sysvec,
 1033         .interp_newpath = NULL,
 1034         .brand_note     = &linux32_brandnote,
 1035         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 1036 };
 1037 
 1038 static Elf32_Brandinfo linux_muslbrand = {
 1039         .brand          = ELFOSABI_LINUX,
 1040         .machine        = EM_386,
 1041         .compat_3_brand = "Linux",
 1042         .emul_path      = "/compat/linux",
 1043         .interp_path    = "/lib/ld-musl-i386.so.1",
 1044         .sysvec         = &elf_linux_sysvec,
 1045         .interp_newpath = NULL,
 1046         .brand_note     = &linux32_brandnote,
 1047         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 1048 };
 1049 
 1050 Elf32_Brandinfo *linux_brandlist[] = {
 1051         &linux_brand,
 1052         &linux_glibc2brand,
 1053         &linux_muslbrand,
 1054         NULL
 1055 };
 1056 
 1057 static int
 1058 linux_elf_modevent(module_t mod, int type, void *data)
 1059 {
 1060         Elf32_Brandinfo **brandinfo;
 1061         int error;
 1062         struct linux_ioctl_handler **lihp;
 1063 
 1064         error = 0;
 1065 
 1066         switch(type) {
 1067         case MOD_LOAD:
 1068                 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
 1069                      ++brandinfo)
 1070                         if (elf32_insert_brand_entry(*brandinfo) < 0)
 1071                                 error = EINVAL;
 1072                 if (error == 0) {
 1073                         SET_FOREACH(lihp, linux_ioctl_handler_set)
 1074                                 linux32_ioctl_register_handler(*lihp);
 1075                         LIST_INIT(&futex_list);
 1076                         mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF);
 1077                         stclohz = (stathz ? stathz : hz);
 1078                         if (bootverbose)
 1079                                 printf("Linux ELF exec handler installed\n");
 1080                 } else
 1081                         printf("cannot insert Linux ELF brand handler\n");
 1082                 break;
 1083         case MOD_UNLOAD:
 1084                 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
 1085                      ++brandinfo)
 1086                         if (elf32_brand_inuse(*brandinfo))
 1087                                 error = EBUSY;
 1088                 if (error == 0) {
 1089                         for (brandinfo = &linux_brandlist[0];
 1090                              *brandinfo != NULL; ++brandinfo)
 1091                                 if (elf32_remove_brand_entry(*brandinfo) < 0)
 1092                                         error = EINVAL;
 1093                 }
 1094                 if (error == 0) {
 1095                         SET_FOREACH(lihp, linux_ioctl_handler_set)
 1096                                 linux32_ioctl_unregister_handler(*lihp);
 1097                         mtx_destroy(&futex_mtx);
 1098                         if (bootverbose)
 1099                                 printf("Linux ELF exec handler removed\n");
 1100                 } else
 1101                         printf("Could not deinstall ELF interpreter entry\n");
 1102                 break;
 1103         default:
 1104                 return (EOPNOTSUPP);
 1105         }
 1106         return (error);
 1107 }
 1108 
 1109 static moduledata_t linux_elf_mod = {
 1110         "linuxelf",
 1111         linux_elf_modevent,
 1112         0
 1113 };
 1114 
 1115 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
 1116 MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1);
 1117 FEATURE(linux, "Linux 32bit support");

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