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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/amd64/linux32/linux32_sysvec.c

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    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 <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/11.0/sys/amd64/linux32/linux32_sysvec.c 298482 2016-04-22 16:57:42Z pfg $");
   35 #include "opt_compat.h"
   36 
   37 #ifndef COMPAT_FREEBSD32
   38 #error "Unable to compile Linux-emulator due to missing COMPAT_FREEBSD32 option!"
   39 #endif
   40 
   41 #define __ELF_WORD_SIZE 32
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/exec.h>
   46 #include <sys/fcntl.h>
   47 #include <sys/imgact.h>
   48 #include <sys/imgact_elf.h>
   49 #include <sys/kernel.h>
   50 #include <sys/lock.h>
   51 #include <sys/malloc.h>
   52 #include <sys/module.h>
   53 #include <sys/mutex.h>
   54 #include <sys/proc.h>
   55 #include <sys/resourcevar.h>
   56 #include <sys/signalvar.h>
   57 #include <sys/sysctl.h>
   58 #include <sys/syscallsubr.h>
   59 #include <sys/sysent.h>
   60 #include <sys/sysproto.h>
   61 #include <sys/vnode.h>
   62 #include <sys/eventhandler.h>
   63 
   64 #include <vm/vm.h>
   65 #include <vm/pmap.h>
   66 #include <vm/vm_extern.h>
   67 #include <vm/vm_map.h>
   68 #include <vm/vm_object.h>
   69 #include <vm/vm_page.h>
   70 #include <vm/vm_param.h>
   71 
   72 #include <machine/cpu.h>
   73 #include <machine/md_var.h>
   74 #include <machine/pcb.h>
   75 #include <machine/specialreg.h>
   76 
   77 #include <amd64/linux32/linux.h>
   78 #include <amd64/linux32/linux32_proto.h>
   79 #include <compat/linux/linux_emul.h>
   80 #include <compat/linux/linux_futex.h>
   81 #include <compat/linux/linux_ioctl.h>
   82 #include <compat/linux/linux_mib.h>
   83 #include <compat/linux/linux_misc.h>
   84 #include <compat/linux/linux_signal.h>
   85 #include <compat/linux/linux_util.h>
   86 #include <compat/linux/linux_vdso.h>
   87 
   88 MODULE_VERSION(linux, 1);
   89 
   90 #define AUXARGS_ENTRY_32(pos, id, val)  \
   91         do {                            \
   92                 suword32(pos++, id);    \
   93                 suword32(pos++, val);   \
   94         } while (0)
   95 
   96 #if BYTE_ORDER == LITTLE_ENDIAN
   97 #define SHELLMAGIC      0x2123 /* #! */
   98 #else
   99 #define SHELLMAGIC      0x2321
  100 #endif
  101 
  102 /*
  103  * Allow the sendsig functions to use the ldebug() facility
  104  * even though they are not syscalls themselves. Map them
  105  * to syscall 0. This is slightly less bogus than using
  106  * ldebug(sigreturn).
  107  */
  108 #define LINUX32_SYS_linux_rt_sendsig    0
  109 #define LINUX32_SYS_linux_sendsig       0
  110 
  111 const char *linux_kplatform;
  112 static int linux_szsigcode;
  113 static vm_object_t linux_shared_page_obj;
  114 static char *linux_shared_page_mapping;
  115 extern char _binary_linux32_locore_o_start;
  116 extern char _binary_linux32_locore_o_end;
  117 
  118 extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL];
  119 
  120 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
  121 
  122 static int      elf_linux_fixup(register_t **stack_base,
  123                     struct image_params *iparams);
  124 static register_t *linux_copyout_strings(struct image_params *imgp);
  125 static void     linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
  126 static void     exec_linux_setregs(struct thread *td, 
  127                                    struct image_params *imgp, u_long stack);
  128 static void     linux32_fixlimit(struct rlimit *rl, int which);
  129 static boolean_t linux32_trans_osrel(const Elf_Note *note, int32_t *osrel);
  130 static void     linux_vdso_install(void *param);
  131 static void     linux_vdso_deinstall(void *param);
  132 
  133 /*
  134  * Linux syscalls return negative errno's, we do positive and map them
  135  * Reference:
  136  *   FreeBSD: src/sys/sys/errno.h
  137  *   Linux:   linux-2.6.17.8/include/asm-generic/errno-base.h
  138  *            linux-2.6.17.8/include/asm-generic/errno.h
  139  */
  140 static int bsd_to_linux_errno[ELAST + 1] = {
  141         -0,  -1,  -2,  -3,  -4,  -5,  -6,  -7,  -8,  -9,
  142         -10, -35, -12, -13, -14, -15, -16, -17, -18, -19,
  143         -20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
  144         -30, -31, -32, -33, -34, -11,-115,-114, -88, -89,
  145         -90, -91, -92, -93, -94, -95, -96, -97, -98, -99,
  146         -100,-101,-102,-103,-104,-105,-106,-107,-108,-109,
  147         -110,-111, -40, -36,-112,-113, -39, -11, -87,-122,
  148         -116, -66,  -6,  -6,  -6,  -6,  -6, -37, -38,  -9,
  149           -6,  -6, -43, -42, -75,-125, -84, -95, -16, -74,
  150          -72, -67, -71
  151 };
  152 
  153 #define LINUX_T_UNKNOWN  255
  154 static int _bsd_to_linux_trapcode[] = {
  155         LINUX_T_UNKNOWN,        /* 0 */
  156         6,                      /* 1  T_PRIVINFLT */
  157         LINUX_T_UNKNOWN,        /* 2 */
  158         3,                      /* 3  T_BPTFLT */
  159         LINUX_T_UNKNOWN,        /* 4 */
  160         LINUX_T_UNKNOWN,        /* 5 */
  161         16,                     /* 6  T_ARITHTRAP */
  162         254,                    /* 7  T_ASTFLT */
  163         LINUX_T_UNKNOWN,        /* 8 */
  164         13,                     /* 9  T_PROTFLT */
  165         1,                      /* 10 T_TRCTRAP */
  166         LINUX_T_UNKNOWN,        /* 11 */
  167         14,                     /* 12 T_PAGEFLT */
  168         LINUX_T_UNKNOWN,        /* 13 */
  169         17,                     /* 14 T_ALIGNFLT */
  170         LINUX_T_UNKNOWN,        /* 15 */
  171         LINUX_T_UNKNOWN,        /* 16 */
  172         LINUX_T_UNKNOWN,        /* 17 */
  173         0,                      /* 18 T_DIVIDE */
  174         2,                      /* 19 T_NMI */
  175         4,                      /* 20 T_OFLOW */
  176         5,                      /* 21 T_BOUND */
  177         7,                      /* 22 T_DNA */
  178         8,                      /* 23 T_DOUBLEFLT */
  179         9,                      /* 24 T_FPOPFLT */
  180         10,                     /* 25 T_TSSFLT */
  181         11,                     /* 26 T_SEGNPFLT */
  182         12,                     /* 27 T_STKFLT */
  183         18,                     /* 28 T_MCHK */
  184         19,                     /* 29 T_XMMFLT */
  185         15                      /* 30 T_RESERVED */
  186 };
  187 #define bsd_to_linux_trapcode(code) \
  188     ((code)<nitems(_bsd_to_linux_trapcode)? \
  189      _bsd_to_linux_trapcode[(code)]: \
  190      LINUX_T_UNKNOWN)
  191 
  192 struct linux32_ps_strings {
  193         u_int32_t ps_argvstr;   /* first of 0 or more argument strings */
  194         u_int ps_nargvstr;      /* the number of argument strings */
  195         u_int32_t ps_envstr;    /* first of 0 or more environment strings */
  196         u_int ps_nenvstr;       /* the number of environment strings */
  197 };
  198 
  199 LINUX_VDSO_SYM_INTPTR(linux32_sigcode);
  200 LINUX_VDSO_SYM_INTPTR(linux32_rt_sigcode);
  201 LINUX_VDSO_SYM_INTPTR(linux32_vsyscall);
  202 LINUX_VDSO_SYM_CHAR(linux_platform);
  203 
  204 /*
  205  * If FreeBSD & Linux have a difference of opinion about what a trap
  206  * means, deal with it here.
  207  *
  208  * MPSAFE
  209  */
  210 static int
  211 translate_traps(int signal, int trap_code)
  212 {
  213         if (signal != SIGBUS)
  214                 return signal;
  215         switch (trap_code) {
  216         case T_PROTFLT:
  217         case T_TSSFLT:
  218         case T_DOUBLEFLT:
  219         case T_PAGEFLT:
  220                 return SIGSEGV;
  221         default:
  222                 return signal;
  223         }
  224 }
  225 
  226 static int
  227 elf_linux_fixup(register_t **stack_base, struct image_params *imgp)
  228 {
  229         Elf32_Auxargs *args;
  230         Elf32_Addr *base;
  231         Elf32_Addr *pos;
  232         struct linux32_ps_strings *arginfo;
  233         int issetugid;
  234 
  235         arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS;
  236 
  237         KASSERT(curthread->td_proc == imgp->proc,
  238             ("unsafe elf_linux_fixup(), should be curproc"));
  239         base = (Elf32_Addr *)*stack_base;
  240         args = (Elf32_Auxargs *)imgp->auxargs;
  241         pos = base + (imgp->args->argc + imgp->args->envc + 2);
  242 
  243         issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
  244         AUXARGS_ENTRY_32(pos, LINUX_AT_SYSINFO_EHDR,
  245             imgp->proc->p_sysent->sv_shared_page_base);
  246         AUXARGS_ENTRY_32(pos, LINUX_AT_SYSINFO, linux32_vsyscall);
  247         AUXARGS_ENTRY_32(pos, LINUX_AT_HWCAP, cpu_feature);
  248 
  249         /*
  250          * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0,
  251          * as it has appeared in the 2.4.0-rc7 first time.
  252          * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK),
  253          * glibc falls back to the hard-coded CLK_TCK value when aux entry
  254          * is not present.
  255          * Also see linux_times() implementation.
  256          */
  257         if (linux_kernver(curthread) >= LINUX_KERNVER_2004000)
  258                 AUXARGS_ENTRY_32(pos, LINUX_AT_CLKTCK, stclohz);
  259         AUXARGS_ENTRY_32(pos, AT_PHDR, args->phdr);
  260         AUXARGS_ENTRY_32(pos, AT_PHENT, args->phent);
  261         AUXARGS_ENTRY_32(pos, AT_PHNUM, args->phnum);
  262         AUXARGS_ENTRY_32(pos, AT_PAGESZ, args->pagesz);
  263         AUXARGS_ENTRY_32(pos, AT_FLAGS, args->flags);
  264         AUXARGS_ENTRY_32(pos, AT_ENTRY, args->entry);
  265         AUXARGS_ENTRY_32(pos, AT_BASE, args->base);
  266         AUXARGS_ENTRY_32(pos, LINUX_AT_SECURE, issetugid);
  267         AUXARGS_ENTRY_32(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
  268         AUXARGS_ENTRY_32(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
  269         AUXARGS_ENTRY_32(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
  270         AUXARGS_ENTRY_32(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
  271         AUXARGS_ENTRY_32(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
  272         AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary));
  273         if (imgp->execpathp != 0)
  274                 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp));
  275         if (args->execfd != -1)
  276                 AUXARGS_ENTRY_32(pos, AT_EXECFD, args->execfd);
  277         AUXARGS_ENTRY_32(pos, AT_NULL, 0);
  278 
  279         free(imgp->auxargs, M_TEMP);
  280         imgp->auxargs = NULL;
  281 
  282         base--;
  283         suword32(base, (uint32_t)imgp->args->argc);
  284         *stack_base = (register_t *)base;
  285         return (0);
  286 }
  287 
  288 static void
  289 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  290 {
  291         struct thread *td = curthread;
  292         struct proc *p = td->td_proc;
  293         struct sigacts *psp;
  294         struct trapframe *regs;
  295         struct l_rt_sigframe *fp, frame;
  296         int oonstack;
  297         int sig;
  298         int code;
  299         
  300         sig = ksi->ksi_signo;
  301         code = ksi->ksi_code;
  302         PROC_LOCK_ASSERT(p, MA_OWNED);
  303         psp = p->p_sigacts;
  304         mtx_assert(&psp->ps_mtx, MA_OWNED);
  305         regs = td->td_frame;
  306         oonstack = sigonstack(regs->tf_rsp);
  307 
  308 #ifdef DEBUG
  309         if (ldebug(rt_sendsig))
  310                 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"),
  311                     catcher, sig, (void*)mask, code);
  312 #endif
  313         /*
  314          * Allocate space for the signal handler context.
  315          */
  316         if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
  317             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  318                 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
  319                     td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
  320         } else
  321                 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1;
  322         mtx_unlock(&psp->ps_mtx);
  323 
  324         /*
  325          * Build the argument list for the signal handler.
  326          */
  327         sig = bsd_to_linux_signal(sig);
  328 
  329         bzero(&frame, sizeof(frame));
  330 
  331         frame.sf_handler = PTROUT(catcher);
  332         frame.sf_sig = sig;
  333         frame.sf_siginfo = PTROUT(&fp->sf_si);
  334         frame.sf_ucontext = PTROUT(&fp->sf_sc);
  335 
  336         /* Fill in POSIX parts */
  337         ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig);
  338 
  339         /*
  340          * Build the signal context to be used by sigreturn
  341          * and libgcc unwind.
  342          */
  343         frame.sf_sc.uc_flags = 0;               /* XXX ??? */
  344         frame.sf_sc.uc_link = 0;                /* XXX ??? */
  345 
  346         frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
  347         frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
  348         frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
  349             ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
  350         PROC_UNLOCK(p);
  351 
  352         bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask);
  353 
  354         frame.sf_sc.uc_mcontext.sc_mask   = frame.sf_sc.uc_sigmask.__mask;
  355         frame.sf_sc.uc_mcontext.sc_edi    = regs->tf_rdi;
  356         frame.sf_sc.uc_mcontext.sc_esi    = regs->tf_rsi;
  357         frame.sf_sc.uc_mcontext.sc_ebp    = regs->tf_rbp;
  358         frame.sf_sc.uc_mcontext.sc_ebx    = regs->tf_rbx;
  359         frame.sf_sc.uc_mcontext.sc_esp    = regs->tf_rsp;
  360         frame.sf_sc.uc_mcontext.sc_edx    = regs->tf_rdx;
  361         frame.sf_sc.uc_mcontext.sc_ecx    = regs->tf_rcx;
  362         frame.sf_sc.uc_mcontext.sc_eax    = regs->tf_rax;
  363         frame.sf_sc.uc_mcontext.sc_eip    = regs->tf_rip;
  364         frame.sf_sc.uc_mcontext.sc_cs     = regs->tf_cs;
  365         frame.sf_sc.uc_mcontext.sc_gs     = regs->tf_gs;
  366         frame.sf_sc.uc_mcontext.sc_fs     = regs->tf_fs;
  367         frame.sf_sc.uc_mcontext.sc_es     = regs->tf_es;
  368         frame.sf_sc.uc_mcontext.sc_ds     = regs->tf_ds;
  369         frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags;
  370         frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp;
  371         frame.sf_sc.uc_mcontext.sc_ss     = regs->tf_ss;
  372         frame.sf_sc.uc_mcontext.sc_err    = regs->tf_err;
  373         frame.sf_sc.uc_mcontext.sc_cr2    = (u_int32_t)(uintptr_t)ksi->ksi_addr;
  374         frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
  375 
  376 #ifdef DEBUG
  377         if (ldebug(rt_sendsig))
  378                 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"),
  379                     frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp,
  380                     td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask);
  381 #endif
  382 
  383         if (copyout(&frame, fp, sizeof(frame)) != 0) {
  384                 /*
  385                  * Process has trashed its stack; give it an illegal
  386                  * instruction to halt it in its tracks.
  387                  */
  388 #ifdef DEBUG
  389                 if (ldebug(rt_sendsig))
  390                         printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"),
  391                             fp, oonstack);
  392 #endif
  393                 PROC_LOCK(p);
  394                 sigexit(td, SIGILL);
  395         }
  396 
  397         /*
  398          * Build context to run handler in.
  399          */
  400         regs->tf_rsp = PTROUT(fp);
  401         regs->tf_rip = linux32_rt_sigcode;
  402         regs->tf_rflags &= ~(PSL_T | PSL_D);
  403         regs->tf_cs = _ucode32sel;
  404         regs->tf_ss = _udatasel;
  405         regs->tf_ds = _udatasel;
  406         regs->tf_es = _udatasel;
  407         regs->tf_fs = _ufssel;
  408         regs->tf_gs = _ugssel;
  409         regs->tf_flags = TF_HASSEGS;
  410         set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
  411         PROC_LOCK(p);
  412         mtx_lock(&psp->ps_mtx);
  413 }
  414 
  415 
  416 /*
  417  * Send an interrupt to process.
  418  *
  419  * Stack is set up to allow sigcode stored
  420  * in u. to call routine, followed by kcall
  421  * to sigreturn routine below.  After sigreturn
  422  * resets the signal mask, the stack, and the
  423  * frame pointer, it returns to the user
  424  * specified pc, psl.
  425  */
  426 static void
  427 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
  428 {
  429         struct thread *td = curthread;
  430         struct proc *p = td->td_proc;
  431         struct sigacts *psp;
  432         struct trapframe *regs;
  433         struct l_sigframe *fp, frame;
  434         l_sigset_t lmask;
  435         int oonstack;
  436         int sig, code;
  437 
  438         sig = ksi->ksi_signo;
  439         code = ksi->ksi_code;
  440         PROC_LOCK_ASSERT(p, MA_OWNED);
  441         psp = p->p_sigacts;
  442         mtx_assert(&psp->ps_mtx, MA_OWNED);
  443         if (SIGISMEMBER(psp->ps_siginfo, sig)) {
  444                 /* Signal handler installed with SA_SIGINFO. */
  445                 linux_rt_sendsig(catcher, ksi, mask);
  446                 return;
  447         }
  448 
  449         regs = td->td_frame;
  450         oonstack = sigonstack(regs->tf_rsp);
  451 
  452 #ifdef DEBUG
  453         if (ldebug(sendsig))
  454                 printf(ARGS(sendsig, "%p, %d, %p, %u"),
  455                     catcher, sig, (void*)mask, code);
  456 #endif
  457 
  458         /*
  459          * Allocate space for the signal handler context.
  460          */
  461         if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
  462             SIGISMEMBER(psp->ps_sigonstack, sig)) {
  463                 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
  464                     td->td_sigstk.ss_size - sizeof(struct l_sigframe));
  465         } else
  466                 fp = (struct l_sigframe *)regs->tf_rsp - 1;
  467         mtx_unlock(&psp->ps_mtx);
  468         PROC_UNLOCK(p);
  469 
  470         /*
  471          * Build the argument list for the signal handler.
  472          */
  473         sig = bsd_to_linux_signal(sig);
  474 
  475         bzero(&frame, sizeof(frame));
  476 
  477         frame.sf_handler = PTROUT(catcher);
  478         frame.sf_sig = sig;
  479 
  480         bsd_to_linux_sigset(mask, &lmask);
  481 
  482         /*
  483          * Build the signal context to be used by sigreturn.
  484          */
  485         frame.sf_sc.sc_mask   = lmask.__mask;
  486         frame.sf_sc.sc_gs     = regs->tf_gs;
  487         frame.sf_sc.sc_fs     = regs->tf_fs;
  488         frame.sf_sc.sc_es     = regs->tf_es;
  489         frame.sf_sc.sc_ds     = regs->tf_ds;
  490         frame.sf_sc.sc_edi    = regs->tf_rdi;
  491         frame.sf_sc.sc_esi    = regs->tf_rsi;
  492         frame.sf_sc.sc_ebp    = regs->tf_rbp;
  493         frame.sf_sc.sc_ebx    = regs->tf_rbx;
  494         frame.sf_sc.sc_esp    = regs->tf_rsp;
  495         frame.sf_sc.sc_edx    = regs->tf_rdx;
  496         frame.sf_sc.sc_ecx    = regs->tf_rcx;
  497         frame.sf_sc.sc_eax    = regs->tf_rax;
  498         frame.sf_sc.sc_eip    = regs->tf_rip;
  499         frame.sf_sc.sc_cs     = regs->tf_cs;
  500         frame.sf_sc.sc_eflags = regs->tf_rflags;
  501         frame.sf_sc.sc_esp_at_signal = regs->tf_rsp;
  502         frame.sf_sc.sc_ss     = regs->tf_ss;
  503         frame.sf_sc.sc_err    = regs->tf_err;
  504         frame.sf_sc.sc_cr2    = (u_int32_t)(uintptr_t)ksi->ksi_addr;
  505         frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code);
  506 
  507         frame.sf_extramask[0] = lmask.__mask;
  508 
  509         if (copyout(&frame, fp, sizeof(frame)) != 0) {
  510                 /*
  511                  * Process has trashed its stack; give it an illegal
  512                  * instruction to halt it in its tracks.
  513                  */
  514                 PROC_LOCK(p);
  515                 sigexit(td, SIGILL);
  516         }
  517 
  518         /*
  519          * Build context to run handler in.
  520          */
  521         regs->tf_rsp = PTROUT(fp);
  522         regs->tf_rip = linux32_sigcode;
  523         regs->tf_rflags &= ~(PSL_T | PSL_D);
  524         regs->tf_cs = _ucode32sel;
  525         regs->tf_ss = _udatasel;
  526         regs->tf_ds = _udatasel;
  527         regs->tf_es = _udatasel;
  528         regs->tf_fs = _ufssel;
  529         regs->tf_gs = _ugssel;
  530         regs->tf_flags = TF_HASSEGS;
  531         set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
  532         PROC_LOCK(p);
  533         mtx_lock(&psp->ps_mtx);
  534 }
  535 
  536 /*
  537  * System call to cleanup state after a signal
  538  * has been taken.  Reset signal mask and
  539  * stack state from context left by sendsig (above).
  540  * Return to previous pc and psl as specified by
  541  * context left by sendsig. Check carefully to
  542  * make sure that the user has not modified the
  543  * psl to gain improper privileges or to cause
  544  * a machine fault.
  545  */
  546 int
  547 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
  548 {
  549         struct l_sigframe frame;
  550         struct trapframe *regs;
  551         sigset_t bmask;
  552         l_sigset_t lmask;
  553         int eflags;
  554         ksiginfo_t ksi;
  555 
  556         regs = td->td_frame;
  557 
  558 #ifdef DEBUG
  559         if (ldebug(sigreturn))
  560                 printf(ARGS(sigreturn, "%p"), (void *)args->sfp);
  561 #endif
  562         /*
  563          * The trampoline code hands us the sigframe.
  564          * It is unsafe to keep track of it ourselves, in the event that a
  565          * program jumps out of a signal handler.
  566          */
  567         if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
  568                 return (EFAULT);
  569 
  570         /*
  571          * Check for security violations.
  572          */
  573 #define EFLAGS_SECURE(ef, oef)  ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
  574         eflags = frame.sf_sc.sc_eflags;
  575         if (!EFLAGS_SECURE(eflags, regs->tf_rflags))
  576                 return(EINVAL);
  577 
  578         /*
  579          * Don't allow users to load a valid privileged %cs.  Let the
  580          * hardware check for invalid selectors, excess privilege in
  581          * other selectors, invalid %eip's and invalid %esp's.
  582          */
  583 #define CS_SECURE(cs)   (ISPL(cs) == SEL_UPL)
  584         if (!CS_SECURE(frame.sf_sc.sc_cs)) {
  585                 ksiginfo_init_trap(&ksi);
  586                 ksi.ksi_signo = SIGBUS;
  587                 ksi.ksi_code = BUS_OBJERR;
  588                 ksi.ksi_trapno = T_PROTFLT;
  589                 ksi.ksi_addr = (void *)regs->tf_rip;
  590                 trapsignal(td, &ksi);
  591                 return(EINVAL);
  592         }
  593 
  594         lmask.__mask = frame.sf_sc.sc_mask;
  595         lmask.__mask = frame.sf_extramask[0];
  596         linux_to_bsd_sigset(&lmask, &bmask);
  597         kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
  598 
  599         /*
  600          * Restore signal context.
  601          */
  602         regs->tf_rdi    = frame.sf_sc.sc_edi;
  603         regs->tf_rsi    = frame.sf_sc.sc_esi;
  604         regs->tf_rbp    = frame.sf_sc.sc_ebp;
  605         regs->tf_rbx    = frame.sf_sc.sc_ebx;
  606         regs->tf_rdx    = frame.sf_sc.sc_edx;
  607         regs->tf_rcx    = frame.sf_sc.sc_ecx;
  608         regs->tf_rax    = frame.sf_sc.sc_eax;
  609         regs->tf_rip    = frame.sf_sc.sc_eip;
  610         regs->tf_cs     = frame.sf_sc.sc_cs;
  611         regs->tf_ds     = frame.sf_sc.sc_ds;
  612         regs->tf_es     = frame.sf_sc.sc_es;
  613         regs->tf_fs     = frame.sf_sc.sc_fs;
  614         regs->tf_gs     = frame.sf_sc.sc_gs;
  615         regs->tf_rflags = eflags;
  616         regs->tf_rsp    = frame.sf_sc.sc_esp_at_signal;
  617         regs->tf_ss     = frame.sf_sc.sc_ss;
  618         set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
  619 
  620         return (EJUSTRETURN);
  621 }
  622 
  623 /*
  624  * System call to cleanup state after a signal
  625  * has been taken.  Reset signal mask and
  626  * stack state from context left by rt_sendsig (above).
  627  * Return to previous pc and psl as specified by
  628  * context left by sendsig. Check carefully to
  629  * make sure that the user has not modified the
  630  * psl to gain improper privileges or to cause
  631  * a machine fault.
  632  */
  633 int
  634 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
  635 {
  636         struct l_ucontext uc;
  637         struct l_sigcontext *context;
  638         sigset_t bmask;
  639         l_stack_t *lss;
  640         stack_t ss;
  641         struct trapframe *regs;
  642         int eflags;
  643         ksiginfo_t ksi;
  644 
  645         regs = td->td_frame;
  646 
  647 #ifdef DEBUG
  648         if (ldebug(rt_sigreturn))
  649                 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp);
  650 #endif
  651         /*
  652          * The trampoline code hands us the ucontext.
  653          * It is unsafe to keep track of it ourselves, in the event that a
  654          * program jumps out of a signal handler.
  655          */
  656         if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
  657                 return (EFAULT);
  658 
  659         context = &uc.uc_mcontext;
  660 
  661         /*
  662          * Check for security violations.
  663          */
  664 #define EFLAGS_SECURE(ef, oef)  ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
  665         eflags = context->sc_eflags;
  666         if (!EFLAGS_SECURE(eflags, regs->tf_rflags))
  667                 return(EINVAL);
  668 
  669         /*
  670          * Don't allow users to load a valid privileged %cs.  Let the
  671          * hardware check for invalid selectors, excess privilege in
  672          * other selectors, invalid %eip's and invalid %esp's.
  673          */
  674 #define CS_SECURE(cs)   (ISPL(cs) == SEL_UPL)
  675         if (!CS_SECURE(context->sc_cs)) {
  676                 ksiginfo_init_trap(&ksi);
  677                 ksi.ksi_signo = SIGBUS;
  678                 ksi.ksi_code = BUS_OBJERR;
  679                 ksi.ksi_trapno = T_PROTFLT;
  680                 ksi.ksi_addr = (void *)regs->tf_rip;
  681                 trapsignal(td, &ksi);
  682                 return(EINVAL);
  683         }
  684 
  685         linux_to_bsd_sigset(&uc.uc_sigmask, &bmask);
  686         kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
  687 
  688         /*
  689          * Restore signal context
  690          */
  691         regs->tf_gs     = context->sc_gs;
  692         regs->tf_fs     = context->sc_fs;
  693         regs->tf_es     = context->sc_es;
  694         regs->tf_ds     = context->sc_ds;
  695         regs->tf_rdi    = context->sc_edi;
  696         regs->tf_rsi    = context->sc_esi;
  697         regs->tf_rbp    = context->sc_ebp;
  698         regs->tf_rbx    = context->sc_ebx;
  699         regs->tf_rdx    = context->sc_edx;
  700         regs->tf_rcx    = context->sc_ecx;
  701         regs->tf_rax    = context->sc_eax;
  702         regs->tf_rip    = context->sc_eip;
  703         regs->tf_cs     = context->sc_cs;
  704         regs->tf_rflags = eflags;
  705         regs->tf_rsp    = context->sc_esp_at_signal;
  706         regs->tf_ss     = context->sc_ss;
  707         set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
  708 
  709         /*
  710          * call sigaltstack & ignore results..
  711          */
  712         lss = &uc.uc_stack;
  713         ss.ss_sp = PTRIN(lss->ss_sp);
  714         ss.ss_size = lss->ss_size;
  715         ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
  716 
  717 #ifdef DEBUG
  718         if (ldebug(rt_sigreturn))
  719                 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"),
  720                     ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask);
  721 #endif
  722         (void)kern_sigaltstack(td, &ss, NULL);
  723 
  724         return (EJUSTRETURN);
  725 }
  726 
  727 static int
  728 linux32_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
  729 {
  730         struct proc *p;
  731         struct trapframe *frame;
  732 
  733         p = td->td_proc;
  734         frame = td->td_frame;
  735 
  736         sa->args[0] = frame->tf_rbx;
  737         sa->args[1] = frame->tf_rcx;
  738         sa->args[2] = frame->tf_rdx;
  739         sa->args[3] = frame->tf_rsi;
  740         sa->args[4] = frame->tf_rdi;
  741         sa->args[5] = frame->tf_rbp;    /* Unconfirmed */
  742         sa->code = frame->tf_rax;
  743 
  744         if (sa->code >= p->p_sysent->sv_size)
  745                 /* nosys */
  746                 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1];
  747         else
  748                 sa->callp = &p->p_sysent->sv_table[sa->code];
  749         sa->narg = sa->callp->sy_narg;
  750 
  751         td->td_retval[0] = 0;
  752         td->td_retval[1] = frame->tf_rdx;
  753 
  754         return (0);
  755 }
  756 
  757 /*
  758  * If a linux binary is exec'ing something, try this image activator
  759  * first.  We override standard shell script execution in order to
  760  * be able to modify the interpreter path.  We only do this if a linux
  761  * binary is doing the exec, so we do not create an EXEC module for it.
  762  */
  763 static int      exec_linux_imgact_try(struct image_params *iparams);
  764 
  765 static int
  766 exec_linux_imgact_try(struct image_params *imgp)
  767 {
  768         const char *head = (const char *)imgp->image_header;
  769         char *rpath;
  770         int error = -1;
  771 
  772         /*
  773         * The interpreter for shell scripts run from a linux binary needs
  774         * to be located in /compat/linux if possible in order to recursively
  775         * maintain linux path emulation.
  776         */
  777         if (((const short *)head)[0] == SHELLMAGIC) {
  778                 /*
  779                 * Run our normal shell image activator.  If it succeeds attempt
  780                 * to use the alternate path for the interpreter.  If an
  781                 * alternate * path is found, use our stringspace to store it.
  782                 */
  783                 if ((error = exec_shell_imgact(imgp)) == 0) {
  784                         linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc),
  785                             imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0,
  786                             AT_FDCWD);
  787                         if (rpath != NULL)
  788                                 imgp->args->fname_buf =
  789                                     imgp->interpreter_name = rpath;
  790                 }
  791         }
  792         return (error);
  793 }
  794 
  795 /*
  796  * Clear registers on exec
  797  * XXX copied from ia32_signal.c.
  798  */
  799 static void
  800 exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack)
  801 {
  802         struct trapframe *regs = td->td_frame;
  803         struct pcb *pcb = td->td_pcb;
  804 
  805         mtx_lock(&dt_lock);
  806         if (td->td_proc->p_md.md_ldt != NULL)
  807                 user_ldt_free(td);
  808         else
  809                 mtx_unlock(&dt_lock);
  810 
  811         critical_enter();
  812         wrmsr(MSR_FSBASE, 0);
  813         wrmsr(MSR_KGSBASE, 0);  /* User value while we're in the kernel */
  814         pcb->pcb_fsbase = 0;
  815         pcb->pcb_gsbase = 0;
  816         critical_exit();
  817         pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
  818 
  819         bzero((char *)regs, sizeof(struct trapframe));
  820         regs->tf_rip = imgp->entry_addr;
  821         regs->tf_rsp = stack;
  822         regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
  823         regs->tf_gs = _ugssel;
  824         regs->tf_fs = _ufssel;
  825         regs->tf_es = _udatasel;
  826         regs->tf_ds = _udatasel;
  827         regs->tf_ss = _udatasel;
  828         regs->tf_flags = TF_HASSEGS;
  829         regs->tf_cs = _ucode32sel;
  830         regs->tf_rbx = imgp->ps_strings;
  831 
  832         fpstate_drop(td);
  833 
  834         /* Do full restore on return so that we can change to a different %cs */
  835         set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET);
  836         td->td_retval[1] = 0;
  837 }
  838 
  839 /*
  840  * XXX copied from ia32_sysvec.c.
  841  */
  842 static register_t *
  843 linux_copyout_strings(struct image_params *imgp)
  844 {
  845         int argc, envc;
  846         u_int32_t *vectp;
  847         char *stringp, *destp;
  848         u_int32_t *stack_base;
  849         struct linux32_ps_strings *arginfo;
  850         char canary[LINUX_AT_RANDOM_LEN];
  851         size_t execpath_len;
  852 
  853         /*
  854          * Calculate string base and vector table pointers.
  855          */
  856         if (imgp->execpath != NULL && imgp->auxargs != NULL)
  857                 execpath_len = strlen(imgp->execpath) + 1;
  858         else
  859                 execpath_len = 0;
  860 
  861         arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS;
  862         destp = (caddr_t)arginfo - SPARE_USRSPACE -
  863             roundup(sizeof(canary), sizeof(char *)) -
  864             roundup(execpath_len, sizeof(char *)) -
  865             roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *));
  866 
  867         if (execpath_len != 0) {
  868                 imgp->execpathp = (uintptr_t)arginfo - execpath_len;
  869                 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len);
  870         }
  871 
  872         /*
  873          * Prepare the canary for SSP.
  874          */
  875         arc4rand(canary, sizeof(canary), 0);
  876         imgp->canary = (uintptr_t)arginfo -
  877             roundup(execpath_len, sizeof(char *)) -
  878             roundup(sizeof(canary), sizeof(char *));
  879         copyout(canary, (void *)imgp->canary, sizeof(canary));
  880 
  881         /*
  882          * If we have a valid auxargs ptr, prepare some room
  883          * on the stack.
  884          */
  885         if (imgp->auxargs) {
  886                 /*
  887                  * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
  888                  * lower compatibility.
  889                  */
  890                 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size :
  891                     (LINUX_AT_COUNT * 2);
  892                 /*
  893                  * The '+ 2' is for the null pointers at the end of each of
  894                  * the arg and env vector sets,and imgp->auxarg_size is room
  895                  * for argument of Runtime loader.
  896                  */
  897                 vectp = (u_int32_t *) (destp - (imgp->args->argc +
  898                     imgp->args->envc + 2 + imgp->auxarg_size) *
  899                     sizeof(u_int32_t));
  900 
  901         } else
  902                 /*
  903                  * The '+ 2' is for the null pointers at the end of each of
  904                  * the arg and env vector sets
  905                  */
  906                 vectp = (u_int32_t *)(destp - (imgp->args->argc +
  907                     imgp->args->envc + 2) * sizeof(u_int32_t));
  908 
  909         /*
  910          * vectp also becomes our initial stack base
  911          */
  912         stack_base = vectp;
  913 
  914         stringp = imgp->args->begin_argv;
  915         argc = imgp->args->argc;
  916         envc = imgp->args->envc;
  917         /*
  918          * Copy out strings - arguments and environment.
  919          */
  920         copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
  921 
  922         /*
  923          * Fill in "ps_strings" struct for ps, w, etc.
  924          */
  925         suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp);
  926         suword32(&arginfo->ps_nargvstr, argc);
  927 
  928         /*
  929          * Fill in argument portion of vector table.
  930          */
  931         for (; argc > 0; --argc) {
  932                 suword32(vectp++, (uint32_t)(intptr_t)destp);
  933                 while (*stringp++ != 0)
  934                         destp++;
  935                 destp++;
  936         }
  937 
  938         /* a null vector table pointer separates the argp's from the envp's */
  939         suword32(vectp++, 0);
  940 
  941         suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp);
  942         suword32(&arginfo->ps_nenvstr, envc);
  943 
  944         /*
  945          * Fill in environment portion of vector table.
  946          */
  947         for (; envc > 0; --envc) {
  948                 suword32(vectp++, (uint32_t)(intptr_t)destp);
  949                 while (*stringp++ != 0)
  950                         destp++;
  951                 destp++;
  952         }
  953 
  954         /* end of vector table is a null pointer */
  955         suword32(vectp, 0);
  956 
  957         return ((register_t *)stack_base);
  958 }
  959 
  960 static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW, 0,
  961     "32-bit Linux emulation");
  962 
  963 static u_long   linux32_maxdsiz = LINUX32_MAXDSIZ;
  964 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW,
  965     &linux32_maxdsiz, 0, "");
  966 static u_long   linux32_maxssiz = LINUX32_MAXSSIZ;
  967 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW,
  968     &linux32_maxssiz, 0, "");
  969 static u_long   linux32_maxvmem = LINUX32_MAXVMEM;
  970 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW,
  971     &linux32_maxvmem, 0, "");
  972 
  973 #if defined(DEBUG)
  974 SYSCTL_PROC(_compat_linux32, OID_AUTO, debug,
  975             CTLTYPE_STRING | CTLFLAG_RW,
  976             0, 0, linux_sysctl_debug, "A",
  977             "Linux debugging control");
  978 #endif
  979 
  980 static void
  981 linux32_fixlimit(struct rlimit *rl, int which)
  982 {
  983 
  984         switch (which) {
  985         case RLIMIT_DATA:
  986                 if (linux32_maxdsiz != 0) {
  987                         if (rl->rlim_cur > linux32_maxdsiz)
  988                                 rl->rlim_cur = linux32_maxdsiz;
  989                         if (rl->rlim_max > linux32_maxdsiz)
  990                                 rl->rlim_max = linux32_maxdsiz;
  991                 }
  992                 break;
  993         case RLIMIT_STACK:
  994                 if (linux32_maxssiz != 0) {
  995                         if (rl->rlim_cur > linux32_maxssiz)
  996                                 rl->rlim_cur = linux32_maxssiz;
  997                         if (rl->rlim_max > linux32_maxssiz)
  998                                 rl->rlim_max = linux32_maxssiz;
  999                 }
 1000                 break;
 1001         case RLIMIT_VMEM:
 1002                 if (linux32_maxvmem != 0) {
 1003                         if (rl->rlim_cur > linux32_maxvmem)
 1004                                 rl->rlim_cur = linux32_maxvmem;
 1005                         if (rl->rlim_max > linux32_maxvmem)
 1006                                 rl->rlim_max = linux32_maxvmem;
 1007                 }
 1008                 break;
 1009         }
 1010 }
 1011 
 1012 struct sysentvec elf_linux_sysvec = {
 1013         .sv_size        = LINUX32_SYS_MAXSYSCALL,
 1014         .sv_table       = linux32_sysent,
 1015         .sv_mask        = 0,
 1016         .sv_errsize     = ELAST + 1,
 1017         .sv_errtbl      = bsd_to_linux_errno,
 1018         .sv_transtrap   = translate_traps,
 1019         .sv_fixup       = elf_linux_fixup,
 1020         .sv_sendsig     = linux_sendsig,
 1021         .sv_sigcode     = &_binary_linux32_locore_o_start,
 1022         .sv_szsigcode   = &linux_szsigcode,
 1023         .sv_name        = "Linux ELF32",
 1024         .sv_coredump    = elf32_coredump,
 1025         .sv_imgact_try  = exec_linux_imgact_try,
 1026         .sv_minsigstksz = LINUX_MINSIGSTKSZ,
 1027         .sv_pagesize    = PAGE_SIZE,
 1028         .sv_minuser     = VM_MIN_ADDRESS,
 1029         .sv_maxuser     = LINUX32_MAXUSER,
 1030         .sv_usrstack    = LINUX32_USRSTACK,
 1031         .sv_psstrings   = LINUX32_PS_STRINGS,
 1032         .sv_stackprot   = VM_PROT_ALL,
 1033         .sv_copyout_strings = linux_copyout_strings,
 1034         .sv_setregs     = exec_linux_setregs,
 1035         .sv_fixlimit    = linux32_fixlimit,
 1036         .sv_maxssiz     = &linux32_maxssiz,
 1037         .sv_flags       = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP,
 1038         .sv_set_syscall_retval = cpu_set_syscall_retval,
 1039         .sv_fetch_syscall_args = linux32_fetch_syscall_args,
 1040         .sv_syscallnames = NULL,
 1041         .sv_shared_page_base = LINUX32_SHAREDPAGE,
 1042         .sv_shared_page_len = PAGE_SIZE,
 1043         .sv_schedtail   = linux_schedtail,
 1044         .sv_thread_detach = linux_thread_detach,
 1045         .sv_trap        = NULL, 
 1046 };
 1047 
 1048 static void
 1049 linux_vdso_install(void *param)
 1050 {
 1051 
 1052         linux_szsigcode = (&_binary_linux32_locore_o_end - 
 1053             &_binary_linux32_locore_o_start);
 1054 
 1055         if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
 1056                 panic("Linux invalid vdso size\n");
 1057 
 1058         __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
 1059 
 1060         linux_shared_page_obj = __elfN(linux_shared_page_init)
 1061             (&linux_shared_page_mapping);
 1062 
 1063         __elfN(linux_vdso_reloc)(&elf_linux_sysvec, LINUX32_SHAREDPAGE);
 1064 
 1065         bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping,
 1066             linux_szsigcode);
 1067         elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
 1068 
 1069         linux_kplatform = linux_shared_page_mapping +
 1070             (linux_platform - (caddr_t)LINUX32_SHAREDPAGE);
 1071 }
 1072 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
 1073     (sysinit_cfunc_t)linux_vdso_install, NULL);
 1074 
 1075 static void
 1076 linux_vdso_deinstall(void *param)
 1077 {
 1078 
 1079         __elfN(linux_shared_page_fini)(linux_shared_page_obj);
 1080 };
 1081 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
 1082     (sysinit_cfunc_t)linux_vdso_deinstall, NULL);
 1083 
 1084 static char GNU_ABI_VENDOR[] = "GNU";
 1085 static int GNULINUX_ABI_DESC = 0;
 1086 
 1087 static boolean_t
 1088 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel)
 1089 {
 1090         const Elf32_Word *desc;
 1091         uintptr_t p;
 1092 
 1093         p = (uintptr_t)(note + 1);
 1094         p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
 1095 
 1096         desc = (const Elf32_Word *)p;
 1097         if (desc[0] != GNULINUX_ABI_DESC)
 1098                 return (FALSE);
 1099 
 1100         /*
 1101          * For linux we encode osrel as follows (see linux_mib.c):
 1102          * VVVMMMIII (version, major, minor), see linux_mib.c.
 1103          */
 1104         *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3];
 1105 
 1106         return (TRUE);
 1107 }
 1108 
 1109 static Elf_Brandnote linux32_brandnote = {
 1110         .hdr.n_namesz   = sizeof(GNU_ABI_VENDOR),
 1111         .hdr.n_descsz   = 16,   /* XXX at least 16 */
 1112         .hdr.n_type     = 1,
 1113         .vendor         = GNU_ABI_VENDOR,
 1114         .flags          = BN_TRANSLATE_OSREL,
 1115         .trans_osrel    = linux32_trans_osrel
 1116 };
 1117 
 1118 static Elf32_Brandinfo linux_brand = {
 1119         .brand          = ELFOSABI_LINUX,
 1120         .machine        = EM_386,
 1121         .compat_3_brand = "Linux",
 1122         .emul_path      = "/compat/linux",
 1123         .interp_path    = "/lib/ld-linux.so.1",
 1124         .sysvec         = &elf_linux_sysvec,
 1125         .interp_newpath = NULL,
 1126         .brand_note     = &linux32_brandnote,
 1127         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 1128 };
 1129 
 1130 static Elf32_Brandinfo linux_glibc2brand = {
 1131         .brand          = ELFOSABI_LINUX,
 1132         .machine        = EM_386,
 1133         .compat_3_brand = "Linux",
 1134         .emul_path      = "/compat/linux",
 1135         .interp_path    = "/lib/ld-linux.so.2",
 1136         .sysvec         = &elf_linux_sysvec,
 1137         .interp_newpath = NULL,
 1138         .brand_note     = &linux32_brandnote,
 1139         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
 1140 };
 1141 
 1142 Elf32_Brandinfo *linux_brandlist[] = {
 1143         &linux_brand,
 1144         &linux_glibc2brand,
 1145         NULL
 1146 };
 1147 
 1148 static int
 1149 linux_elf_modevent(module_t mod, int type, void *data)
 1150 {
 1151         Elf32_Brandinfo **brandinfo;
 1152         int error;
 1153         struct linux_ioctl_handler **lihp;
 1154 
 1155         error = 0;
 1156 
 1157         switch(type) {
 1158         case MOD_LOAD:
 1159                 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
 1160                      ++brandinfo)
 1161                         if (elf32_insert_brand_entry(*brandinfo) < 0)
 1162                                 error = EINVAL;
 1163                 if (error == 0) {
 1164                         SET_FOREACH(lihp, linux_ioctl_handler_set)
 1165                                 linux_ioctl_register_handler(*lihp);
 1166                         LIST_INIT(&futex_list);
 1167                         mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF);
 1168                         stclohz = (stathz ? stathz : hz);
 1169                         if (bootverbose)
 1170                                 printf("Linux ELF exec handler installed\n");
 1171                 } else
 1172                         printf("cannot insert Linux ELF brand handler\n");
 1173                 break;
 1174         case MOD_UNLOAD:
 1175                 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
 1176                      ++brandinfo)
 1177                         if (elf32_brand_inuse(*brandinfo))
 1178                                 error = EBUSY;
 1179                 if (error == 0) {
 1180                         for (brandinfo = &linux_brandlist[0];
 1181                              *brandinfo != NULL; ++brandinfo)
 1182                                 if (elf32_remove_brand_entry(*brandinfo) < 0)
 1183                                         error = EINVAL;
 1184                 }
 1185                 if (error == 0) {
 1186                         SET_FOREACH(lihp, linux_ioctl_handler_set)
 1187                                 linux_ioctl_unregister_handler(*lihp);
 1188                         mtx_destroy(&futex_mtx);
 1189                         if (bootverbose)
 1190                                 printf("Linux ELF exec handler removed\n");
 1191                 } else
 1192                         printf("Could not deinstall ELF interpreter entry\n");
 1193                 break;
 1194         default:
 1195                 return (EOPNOTSUPP);
 1196         }
 1197         return (error);
 1198 }
 1199 
 1200 static moduledata_t linux_elf_mod = {
 1201         "linuxelf",
 1202         linux_elf_modevent,
 1203         0
 1204 };
 1205 
 1206 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
 1207 MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1);
 1208 FEATURE(linux, "Linux 32bit support");

Cache object: 1739c99c56f6f85f87fee83a08f0d2ed


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.