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("$FreeBSD$");
   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_fixlimit(struct rlimit *rl, int which);
   97 
   98 SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode");
   99 
  100 struct sysentvec ia32_freebsd_sysvec = {
  101         FREEBSD32_SYS_MAXSYSCALL,
  102         freebsd32_sysent,
  103         0,
  104         0,
  105         NULL,
  106         0,
  107         NULL,
  108         NULL,
  109         elf32_freebsd_fixup,
  110         ia32_sendsig,
  111         ia32_sigcode,
  112         &sz_ia32_sigcode,
  113         NULL,
  114         "FreeBSD ELF32",
  115         elf32_coredump,
  116         NULL,
  117         MINSIGSTKSZ,
  118         IA32_PAGE_SIZE,
  119         0,
  120         FREEBSD32_USRSTACK,
  121         FREEBSD32_USRSTACK,
  122         FREEBSD32_PS_STRINGS,
  123         VM_PROT_ALL,
  124         ia32_copyout_strings,
  125         ia32_setregs,
  126         ia32_fixlimit
  127 };
  128 
  129 
  130 static Elf32_Brandinfo ia32_brand_info = {
  131                                                 ELFOSABI_FREEBSD,
  132                                                 EM_386,
  133                                                 "FreeBSD",
  134                                                 NULL,
  135                                                 "/libexec/ld-elf.so.1",
  136                                                 &ia32_freebsd_sysvec,
  137                                                 "/libexec/ld-elf32.so.1",
  138                                           };
  139 
  140 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY,
  141         (sysinit_cfunc_t) elf32_insert_brand_entry,
  142         &ia32_brand_info);
  143 
  144 static Elf32_Brandinfo ia32_brand_oinfo = {
  145                                                 ELFOSABI_FREEBSD,
  146                                                 EM_386,
  147                                                 "FreeBSD",
  148                                                 NULL,
  149                                                 "/usr/libexec/ld-elf.so.1",
  150                                                 &ia32_freebsd_sysvec,
  151                                                 "/libexec/ld-elf32.so.1",
  152                                           };
  153 
  154 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
  155         (sysinit_cfunc_t) elf32_insert_brand_entry,
  156         &ia32_brand_oinfo);
  157 
  158 
  159 void
  160 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  161     size_t *off __unused)
  162 {
  163 }
  164 
  165 
  166 /* XXX may be freebsd32 MI */
  167 static register_t *
  168 ia32_copyout_strings(struct image_params *imgp)
  169 {
  170         int argc, envc;
  171         u_int32_t *vectp;
  172         char *stringp, *destp;
  173         u_int32_t *stack_base;
  174         struct freebsd32_ps_strings *arginfo;
  175         int szsigcode;
  176 
  177         /*
  178          * Calculate string base and vector table pointers.
  179          * Also deal with signal trampoline code for this exec type.
  180          */
  181         arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS;
  182         szsigcode = *(imgp->proc->p_sysent->sv_szsigcode);
  183         destp = (caddr_t)arginfo - szsigcode - SPARE_USRSPACE -
  184                 roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *));
  185 
  186         /*
  187          * install sigcode
  188          */
  189         if (szsigcode)
  190                 copyout(imgp->proc->p_sysent->sv_sigcode,
  191                         ((caddr_t)arginfo - szsigcode), szsigcode);
  192 
  193         /*
  194          * If we have a valid auxargs ptr, prepare some room
  195          * on the stack.
  196          */
  197         if (imgp->auxargs) {
  198                 /*
  199                  * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
  200                  * lower compatibility.
  201                  */
  202                 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size
  203                         : (AT_COUNT * 2);
  204                 /*
  205                  * The '+ 2' is for the null pointers at the end of each of
  206                  * the arg and env vector sets,and imgp->auxarg_size is room
  207                  * for argument of Runtime loader.
  208                  */
  209                 vectp = (u_int32_t *) (destp - (imgp->args->argc + imgp->args->envc + 2 +
  210                                        imgp->auxarg_size) * sizeof(u_int32_t));
  211 
  212         } else
  213                 /*
  214                  * The '+ 2' is for the null pointers at the end of each of
  215                  * the arg and env vector sets
  216                  */
  217                 vectp = (u_int32_t *)
  218                         (destp - (imgp->args->argc + imgp->args->envc + 2) * sizeof(u_int32_t));
  219 
  220         /*
  221          * vectp also becomes our initial stack base
  222          */
  223         stack_base = vectp;
  224 
  225         stringp = imgp->args->begin_argv;
  226         argc = imgp->args->argc;
  227         envc = imgp->args->envc;
  228         /*
  229          * Copy out strings - arguments and environment.
  230          */
  231         copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
  232 
  233         /*
  234          * Fill in "ps_strings" struct for ps, w, etc.
  235          */
  236         suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp);
  237         suword32(&arginfo->ps_nargvstr, argc);
  238 
  239         /*
  240          * Fill in argument portion of vector table.
  241          */
  242         for (; argc > 0; --argc) {
  243                 suword32(vectp++, (u_int32_t)(intptr_t)destp);
  244                 while (*stringp++ != 0)
  245                         destp++;
  246                 destp++;
  247         }
  248 
  249         /* a null vector table pointer separates the argp's from the envp's */
  250         suword32(vectp++, 0);
  251 
  252         suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp);
  253         suword32(&arginfo->ps_nenvstr, envc);
  254 
  255         /*
  256          * Fill in environment portion of vector table.
  257          */
  258         for (; envc > 0; --envc) {
  259                 suword32(vectp++, (u_int32_t)(intptr_t)destp);
  260                 while (*stringp++ != 0)
  261                         destp++;
  262                 destp++;
  263         }
  264 
  265         /* end of vector table is a null pointer */
  266         suword32(vectp, 0);
  267 
  268         return ((register_t *)stack_base);
  269 }
  270 
  271 static u_long   ia32_maxdsiz = IA32_MAXDSIZ;
  272 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, "");
  273 TUNABLE_ULONG("compat.ia32.maxdsiz", &ia32_maxdsiz);
  274 static u_long   ia32_maxssiz = IA32_MAXSSIZ;
  275 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, "");
  276 TUNABLE_ULONG("compat.ia32.maxssiz", &ia32_maxssiz);
  277 static u_long   ia32_maxvmem = IA32_MAXVMEM;
  278 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, "");
  279 TUNABLE_ULONG("compat.ia32.maxvmem", &ia32_maxvmem);
  280 
  281 static void
  282 ia32_fixlimit(struct rlimit *rl, int which)
  283 {
  284 
  285         switch (which) {
  286         case RLIMIT_DATA:
  287                 if (ia32_maxdsiz != 0) {
  288                         if (rl->rlim_cur > ia32_maxdsiz)
  289                                 rl->rlim_cur = ia32_maxdsiz;
  290                         if (rl->rlim_max > ia32_maxdsiz)
  291                                 rl->rlim_max = ia32_maxdsiz;
  292                 }
  293                 break;
  294         case RLIMIT_STACK:
  295                 if (ia32_maxssiz != 0) {
  296                         if (rl->rlim_cur > ia32_maxssiz)
  297                                 rl->rlim_cur = ia32_maxssiz;
  298                         if (rl->rlim_max > ia32_maxssiz)
  299                                 rl->rlim_max = ia32_maxssiz;
  300                 }
  301                 break;
  302         case RLIMIT_VMEM:
  303                 if (ia32_maxvmem != 0) {
  304                         if (rl->rlim_cur > ia32_maxvmem)
  305                                 rl->rlim_cur = ia32_maxvmem;
  306                         if (rl->rlim_max > ia32_maxvmem)
  307                                 rl->rlim_max = ia32_maxvmem;
  308                 }
  309                 break;
  310         }
  311 }
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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
