ia32_sysvec.c

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    1 /*-
    2  * Copyright (c) 2002 Doug Rabson
    3  * Copyright (c) 2003 Peter Wemm
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/5.2/sys/compat/ia32/ia32_sysvec.c 123524 2003-12-13 22:20:03Z peter $");
   30 
   31 #include "opt_compat.h"
   32 
   33 #define __ELF_WORD_SIZE 32
   34 
   35 #include <sys/param.h>
   36 #include <sys/exec.h>
   37 #include <sys/fcntl.h>
   38 #include <sys/imgact.h>
   39 #include <sys/kernel.h>
   40 #include <sys/lock.h>
   41 #include <sys/malloc.h>
   42 #include <sys/mutex.h>
   43 #include <sys/mman.h>
   44 #include <sys/namei.h>
   45 #include <sys/pioctl.h>
   46 #include <sys/proc.h>
   47 #include <sys/procfs.h>
   48 #include <sys/resourcevar.h>
   49 #include <sys/systm.h>
   50 #include <sys/signalvar.h>
   51 #include <sys/stat.h>
   52 #include <sys/sx.h>
   53 #include <sys/syscall.h>
   54 #include <sys/sysctl.h>
   55 #include <sys/sysent.h>
   56 #include <sys/vnode.h>
   57 #include <sys/imgact_elf.h>
   58 
   59 #include <vm/vm.h>
   60 #include <vm/vm_kern.h>
   61 #include <vm/vm_param.h>
   62 #include <vm/pmap.h>
   63 #include <vm/vm_map.h>
   64 #include <vm/vm_object.h>
   65 #include <vm/vm_extern.h>
   66 
   67 #include <compat/freebsd32/freebsd32_util.h>
   68 #include <compat/freebsd32/freebsd32_proto.h>
   69 #include <compat/freebsd32/freebsd32_syscall.h>
   70 #include <compat/ia32/ia32_signal.h>
   71 #include <machine/psl.h>
   72 #include <machine/segments.h>
   73 #include <machine/specialreg.h>
   74 #include <machine/frame.h>
   75 #include <machine/md_var.h>
   76 #include <machine/pcb.h>
   77 #include <machine/cpufunc.h>
   78 
   79 CTASSERT(sizeof(struct ia32_mcontext) == 640);
   80 CTASSERT(sizeof(struct ia32_ucontext) == 704);
   81 CTASSERT(sizeof(struct ia32_sigframe) == 800);
   82 CTASSERT(sizeof(struct ia32_siginfo) == 64);
   83 #ifdef COMPAT_FREEBSD4
   84 CTASSERT(sizeof(struct ia32_mcontext4) == 260);
   85 CTASSERT(sizeof(struct ia32_ucontext4) == 324);
   86 CTASSERT(sizeof(struct ia32_sigframe4) == 408);
   87 #endif
   88 
   89 static register_t *ia32_copyout_strings(struct image_params *imgp);
   90 static void ia32_fixlimits(struct image_params *imgp);
   91 
   92 extern struct sysent freebsd32_sysent[];
   93 
   94 SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode");
   95 
   96 struct sysentvec ia32_freebsd_sysvec = {
   97         FREEBSD32_SYS_MAXSYSCALL,
   98         freebsd32_sysent,
   99         0,
  100         0,
  101         NULL,
  102         0,
  103         NULL,
  104         NULL,
  105         elf32_freebsd_fixup,
  106         ia32_sendsig,
  107         ia32_sigcode,
  108         &sz_ia32_sigcode,
  109         NULL,
  110         "FreeBSD ELF32",
  111         elf32_coredump,
  112         NULL,
  113         MINSIGSTKSZ,
  114         PAGE_SIZE,
  115         0,
  116         FREEBSD32_USRSTACK,
  117         FREEBSD32_USRSTACK,
  118         FREEBSD32_PS_STRINGS,
  119         VM_PROT_ALL,
  120         ia32_copyout_strings,
  121         ia32_setregs,
  122         ia32_fixlimits
  123 };
  124 
  125 
  126 const char freebsd32_emul_path[] = "/compat/ia32";
  127 
  128 static Elf32_Brandinfo ia32_brand_info = {
  129                                                 ELFOSABI_FREEBSD,
  130                                                 EM_386,
  131                                                 "FreeBSD",
  132                                                 "/compat/ia32",
  133                                                 "/usr/libexec/ld-elf.so.1",
  134                                                 &ia32_freebsd_sysvec
  135                                           };
  136 
  137 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY,
  138         (sysinit_cfunc_t) elf32_insert_brand_entry,
  139         &ia32_brand_info);
  140 
  141 /* XXX may be freebsd32 MI */
  142 static register_t *
  143 ia32_copyout_strings(struct image_params *imgp)
  144 {
  145         int argc, envc;
  146         u_int32_t *vectp;
  147         char *stringp, *destp;
  148         u_int32_t *stack_base;
  149         struct freebsd32_ps_strings *arginfo;
  150         int szsigcode;
  151 
  152         /*
  153          * Calculate string base and vector table pointers.
  154          * Also deal with signal trampoline code for this exec type.
  155          */
  156         arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS;
  157         szsigcode = *(imgp->proc->p_sysent->sv_szsigcode);
  158         destp = (caddr_t)arginfo - szsigcode - SPARE_USRSPACE -
  159                 roundup((ARG_MAX - imgp->stringspace), sizeof(char *));
  160 
  161         /*
  162          * install sigcode
  163          */
  164         if (szsigcode)
  165                 copyout(imgp->proc->p_sysent->sv_sigcode,
  166                         ((caddr_t)arginfo - szsigcode), szsigcode);
  167 
  168         /*
  169          * If we have a valid auxargs ptr, prepare some room
  170          * on the stack.
  171          */
  172         if (imgp->auxargs) {
  173                 /*
  174                  * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
  175                  * lower compatibility.
  176                  */
  177                 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size
  178                         : (AT_COUNT * 2);
  179                 /*
  180                  * The '+ 2' is for the null pointers at the end of each of
  181                  * the arg and env vector sets,and imgp->auxarg_size is room
  182                  * for argument of Runtime loader.
  183                  */
  184                 vectp = (u_int32_t *) (destp - (imgp->argc + imgp->envc + 2 +
  185                                        imgp->auxarg_size) * sizeof(u_int32_t));
  186 
  187         } else
  188                 /*
  189                  * The '+ 2' is for the null pointers at the end of each of
  190                  * the arg and env vector sets
  191                  */
  192                 vectp = (u_int32_t *)
  193                         (destp - (imgp->argc + imgp->envc + 2) * sizeof(u_int32_t));
  194 
  195         /*
  196          * vectp also becomes our initial stack base
  197          */
  198         stack_base = vectp;
  199 
  200         stringp = imgp->stringbase;
  201         argc = imgp->argc;
  202         envc = imgp->envc;
  203         /*
  204          * Copy out strings - arguments and environment.
  205          */
  206         copyout(stringp, destp, ARG_MAX - imgp->stringspace);
  207 
  208         /*
  209          * Fill in "ps_strings" struct for ps, w, etc.
  210          */
  211         suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp);
  212         suword32(&arginfo->ps_nargvstr, argc);
  213 
  214         /*
  215          * Fill in argument portion of vector table.
  216          */
  217         for (; argc > 0; --argc) {
  218                 suword32(vectp++, (u_int32_t)(intptr_t)destp);
  219                 while (*stringp++ != 0)
  220                         destp++;
  221                 destp++;
  222         }
  223 
  224         /* a null vector table pointer separates the argp's from the envp's */
  225         suword32(vectp++, 0);
  226 
  227         suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp);
  228         suword32(&arginfo->ps_nenvstr, envc);
  229 
  230         /*
  231          * Fill in environment portion of vector table.
  232          */
  233         for (; envc > 0; --envc) {
  234                 suword32(vectp++, (u_int32_t)(intptr_t)destp);
  235                 while (*stringp++ != 0)
  236                         destp++;
  237                 destp++;
  238         }
  239 
  240         /* end of vector table is a null pointer */
  241         suword32(vectp, 0);
  242 
  243         return ((register_t *)stack_base);
  244 }
  245 
  246 static u_long   ia32_maxdsiz = IA32_MAXDSIZ;
  247 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, "");
  248 static u_long   ia32_maxssiz = IA32_MAXSSIZ;
  249 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, "");
  250 static u_long   ia32_maxvmem = IA32_MAXVMEM;
  251 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, "");
  252 
  253 static void
  254 ia32_fixlimits(struct image_params *imgp)
  255 {
  256         struct proc *p = imgp->proc;
  257 
  258         if (ia32_maxdsiz != 0) {
  259                 if (p->p_rlimit[RLIMIT_DATA].rlim_cur > ia32_maxdsiz ||
  260                     p->p_rlimit[RLIMIT_DATA].rlim_max > ia32_maxdsiz) {
  261                         if (p->p_limit->p_refcnt > 1) {
  262                                 p->p_limit->p_refcnt--;
  263                                 p->p_limit = limcopy(p->p_limit);
  264                         }
  265                         if (p->p_rlimit[RLIMIT_DATA].rlim_cur > ia32_maxdsiz)
  266                                 p->p_rlimit[RLIMIT_DATA].rlim_cur =
  267                                     ia32_maxdsiz;
  268                         if (p->p_rlimit[RLIMIT_DATA].rlim_max > ia32_maxdsiz)
  269                                 p->p_rlimit[RLIMIT_DATA].rlim_max =
  270                                     ia32_maxdsiz;
  271                 }
  272         }
  273         if (ia32_maxssiz != 0) {
  274                 if (p->p_rlimit[RLIMIT_STACK].rlim_cur > ia32_maxssiz ||
  275                     p->p_rlimit[RLIMIT_STACK].rlim_max > ia32_maxssiz) {
  276                         if (p->p_limit->p_refcnt > 1) {
  277                                 p->p_limit->p_refcnt--;
  278                                 p->p_limit = limcopy(p->p_limit);
  279                         }
  280                         if (p->p_rlimit[RLIMIT_STACK].rlim_cur > ia32_maxssiz)
  281                                 p->p_rlimit[RLIMIT_STACK].rlim_cur =
  282                                     ia32_maxssiz;
  283                         if (p->p_rlimit[RLIMIT_STACK].rlim_max > ia32_maxssiz)
  284                                 p->p_rlimit[RLIMIT_STACK].rlim_max =
  285                                     ia32_maxssiz;
  286                 }
  287         }
  288         if (ia32_maxvmem != 0) {
  289                 if (p->p_rlimit[RLIMIT_VMEM].rlim_cur > ia32_maxvmem ||
  290                     p->p_rlimit[RLIMIT_VMEM].rlim_max > ia32_maxvmem) {
  291                         if (p->p_limit->p_refcnt > 1) {
  292                                 p->p_limit->p_refcnt--;
  293                                 p->p_limit = limcopy(p->p_limit);
  294                         }
  295                         if (p->p_rlimit[RLIMIT_VMEM].rlim_cur > ia32_maxvmem)
  296                                 p->p_rlimit[RLIMIT_VMEM].rlim_cur =
  297                                     ia32_maxvmem;
  298                         if (p->p_rlimit[RLIMIT_VMEM].rlim_max > ia32_maxvmem)
  299                                 p->p_rlimit[RLIMIT_VMEM].rlim_max =
  300                                     ia32_maxvmem;
  301                 }
  302         }
  303 }
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FreeBSD/Linux Kernel Cross Reference sys/compat/ia32/ia32_sysvec.c

FreeBSD/Linux Kernel Cross Reference
sys/compat/ia32/ia32_sysvec.c
