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: src/sys/compat/ia32/ia32_sysvec.c,v 1.19 2004/08/11 02:35:05 marcel Exp $");
   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 #ifdef __amd64__
   72 #include <machine/psl.h>
   73 #include <machine/segments.h>
   74 #include <machine/specialreg.h>
   75 #else
   76 #include <i386/include/psl.h>
   77 #include <i386/include/segments.h>
   78 #include <i386/include/specialreg.h>
   79 #endif
   80 #include <machine/frame.h>
   81 #include <machine/md_var.h>
   82 #include <machine/pcb.h>
   83 #include <machine/cpufunc.h>
   84 
   85 CTASSERT(sizeof(struct ia32_mcontext) == 640);
   86 CTASSERT(sizeof(struct ia32_ucontext) == 704);
   87 CTASSERT(sizeof(struct ia32_sigframe) == 800);
   88 CTASSERT(sizeof(struct ia32_siginfo) == 64);
   89 #ifdef COMPAT_FREEBSD4
   90 CTASSERT(sizeof(struct ia32_mcontext4) == 260);
   91 CTASSERT(sizeof(struct ia32_ucontext4) == 324);
   92 CTASSERT(sizeof(struct ia32_sigframe4) == 408);
   93 #endif
   94 
   95 static register_t *ia32_copyout_strings(struct image_params *imgp);
   96 static void ia32_fixlimits(struct image_params *imgp);
   97 
   98 extern struct sysent freebsd32_sysent[];
   99 
  100 SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode");
  101 
  102 struct sysentvec ia32_freebsd_sysvec = {
  103         FREEBSD32_SYS_MAXSYSCALL,
  104         freebsd32_sysent,
  105         0,
  106         0,
  107         NULL,
  108         0,
  109         NULL,
  110         NULL,
  111         elf32_freebsd_fixup,
  112         ia32_sendsig,
  113         ia32_sigcode,
  114         &sz_ia32_sigcode,
  115         NULL,
  116         "FreeBSD ELF32",
  117         elf32_coredump,
  118         NULL,
  119         MINSIGSTKSZ,
  120         IA32_PAGE_SIZE,
  121         0,
  122         FREEBSD32_USRSTACK,
  123         FREEBSD32_USRSTACK,
  124         FREEBSD32_PS_STRINGS,
  125         VM_PROT_ALL,
  126         ia32_copyout_strings,
  127         ia32_setregs,
  128         ia32_fixlimits
  129 };
  130 
  131 
  132 static Elf32_Brandinfo ia32_brand_info = {
  133                                                 ELFOSABI_FREEBSD,
  134                                                 EM_386,
  135                                                 "FreeBSD",
  136                                                 NULL,
  137                                                 "/libexec/ld-elf.so.1",
  138                                                 &ia32_freebsd_sysvec,
  139                                                 "/libexec/ld-elf32.so.1",
  140                                           };
  141 
  142 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY,
  143         (sysinit_cfunc_t) elf32_insert_brand_entry,
  144         &ia32_brand_info);
  145 
  146 static Elf32_Brandinfo ia32_brand_oinfo = {
  147                                                 ELFOSABI_FREEBSD,
  148                                                 EM_386,
  149                                                 "FreeBSD",
  150                                                 NULL,
  151                                                 "/usr/libexec/ld-elf.so.1",
  152                                                 &ia32_freebsd_sysvec,
  153                                                 "/libexec/ld-elf32.so.1",
  154                                           };
  155 
  156 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
  157         (sysinit_cfunc_t) elf32_insert_brand_entry,
  158         &ia32_brand_oinfo);
  159 
  160 
  161 void
  162 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  163     size_t *off __unused)
  164 {
  165 }
  166 
  167 
  168 /* XXX may be freebsd32 MI */
  169 static register_t *
  170 ia32_copyout_strings(struct image_params *imgp)
  171 {
  172         int argc, envc;
  173         u_int32_t *vectp;
  174         char *stringp, *destp;
  175         u_int32_t *stack_base;
  176         struct freebsd32_ps_strings *arginfo;
  177         int szsigcode;
  178 
  179         /*
  180          * Calculate string base and vector table pointers.
  181          * Also deal with signal trampoline code for this exec type.
  182          */
  183         arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS;
  184         szsigcode = *(imgp->proc->p_sysent->sv_szsigcode);
  185         destp = (caddr_t)arginfo - szsigcode - SPARE_USRSPACE -
  186                 roundup((ARG_MAX - imgp->stringspace), sizeof(char *));
  187 
  188         /*
  189          * install sigcode
  190          */
  191         if (szsigcode)
  192                 copyout(imgp->proc->p_sysent->sv_sigcode,
  193                         ((caddr_t)arginfo - szsigcode), szsigcode);
  194 
  195         /*
  196          * If we have a valid auxargs ptr, prepare some room
  197          * on the stack.
  198          */
  199         if (imgp->auxargs) {
  200                 /*
  201                  * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
  202                  * lower compatibility.
  203                  */
  204                 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size
  205                         : (AT_COUNT * 2);
  206                 /*
  207                  * The '+ 2' is for the null pointers at the end of each of
  208                  * the arg and env vector sets,and imgp->auxarg_size is room
  209                  * for argument of Runtime loader.
  210                  */
  211                 vectp = (u_int32_t *) (destp - (imgp->argc + imgp->envc + 2 +
  212                                        imgp->auxarg_size) * sizeof(u_int32_t));
  213 
  214         } else
  215                 /*
  216                  * The '+ 2' is for the null pointers at the end of each of
  217                  * the arg and env vector sets
  218                  */
  219                 vectp = (u_int32_t *)
  220                         (destp - (imgp->argc + imgp->envc + 2) * sizeof(u_int32_t));
  221 
  222         /*
  223          * vectp also becomes our initial stack base
  224          */
  225         stack_base = vectp;
  226 
  227         stringp = imgp->stringbase;
  228         argc = imgp->argc;
  229         envc = imgp->envc;
  230         /*
  231          * Copy out strings - arguments and environment.
  232          */
  233         copyout(stringp, destp, ARG_MAX - imgp->stringspace);
  234 
  235         /*
  236          * Fill in "ps_strings" struct for ps, w, etc.
  237          */
  238         suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp);
  239         suword32(&arginfo->ps_nargvstr, argc);
  240 
  241         /*
  242          * Fill in argument portion of vector table.
  243          */
  244         for (; argc > 0; --argc) {
  245                 suword32(vectp++, (u_int32_t)(intptr_t)destp);
  246                 while (*stringp++ != 0)
  247                         destp++;
  248                 destp++;
  249         }
  250 
  251         /* a null vector table pointer separates the argp's from the envp's */
  252         suword32(vectp++, 0);
  253 
  254         suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp);
  255         suword32(&arginfo->ps_nenvstr, envc);
  256 
  257         /*
  258          * Fill in environment portion of vector table.
  259          */
  260         for (; envc > 0; --envc) {
  261                 suword32(vectp++, (u_int32_t)(intptr_t)destp);
  262                 while (*stringp++ != 0)
  263                         destp++;
  264                 destp++;
  265         }
  266 
  267         /* end of vector table is a null pointer */
  268         suword32(vectp, 0);
  269 
  270         return ((register_t *)stack_base);
  271 }
  272 
  273 static u_long   ia32_maxdsiz = IA32_MAXDSIZ;
  274 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, "");
  275 static u_long   ia32_maxssiz = IA32_MAXSSIZ;
  276 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, "");
  277 static u_long   ia32_maxvmem = IA32_MAXVMEM;
  278 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, "");
  279 
  280 static void
  281 ia32_fixlimits(struct image_params *imgp)
  282 {
  283         struct proc *p = imgp->proc;
  284         struct plimit *oldlim, *newlim;
  285 
  286         if (ia32_maxdsiz == 0 && ia32_maxssiz == 0 && ia32_maxvmem == 0)
  287                 return;
  288         newlim = lim_alloc();
  289         PROC_LOCK(p);
  290         oldlim = p->p_limit;
  291         lim_copy(newlim, oldlim);
  292         if (ia32_maxdsiz != 0) {
  293                 if (newlim->pl_rlimit[RLIMIT_DATA].rlim_cur > ia32_maxdsiz)
  294                     newlim->pl_rlimit[RLIMIT_DATA].rlim_cur = ia32_maxdsiz;
  295                 if (newlim->pl_rlimit[RLIMIT_DATA].rlim_max > ia32_maxdsiz)
  296                     newlim->pl_rlimit[RLIMIT_DATA].rlim_max = ia32_maxdsiz;
  297         }
  298         if (ia32_maxssiz != 0) {
  299                 if (newlim->pl_rlimit[RLIMIT_STACK].rlim_cur > ia32_maxssiz)
  300                     newlim->pl_rlimit[RLIMIT_STACK].rlim_cur = ia32_maxssiz;
  301                 if (newlim->pl_rlimit[RLIMIT_STACK].rlim_max > ia32_maxssiz)
  302                     newlim->pl_rlimit[RLIMIT_STACK].rlim_max = ia32_maxssiz;
  303         }
  304         if (ia32_maxvmem != 0) {
  305                 if (newlim->pl_rlimit[RLIMIT_VMEM].rlim_cur > ia32_maxvmem)
  306                     newlim->pl_rlimit[RLIMIT_VMEM].rlim_cur = ia32_maxvmem;
  307                 if (newlim->pl_rlimit[RLIMIT_VMEM].rlim_max > ia32_maxvmem)
  308                     newlim->pl_rlimit[RLIMIT_VMEM].rlim_max = ia32_maxvmem;
  309         }
  310         p->p_limit = newlim;
  311         PROC_UNLOCK(p);
  312         lim_free(oldlim);
  313 }
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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
