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/compat/ia32/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/9.0/sys/compat/ia32/ia32_sysvec.c 220238 2011-04-01 11:16:29Z kib $");
   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_signal.h>
   68 #include <compat/freebsd32/freebsd32_util.h>
   69 #include <compat/freebsd32/freebsd32_proto.h>
   70 #include <compat/freebsd32/freebsd32_syscall.h>
   71 #include <compat/ia32/ia32_signal.h>
   72 #ifdef __amd64__
   73 #include <machine/psl.h>
   74 #include <machine/segments.h>
   75 #include <machine/specialreg.h>
   76 #else
   77 #include <i386/include/psl.h>
   78 #include <i386/include/segments.h>
   79 #include <i386/include/specialreg.h>
   80 #endif
   81 #include <machine/frame.h>
   82 #include <machine/md_var.h>
   83 #include <machine/pcb.h>
   84 #include <machine/cpufunc.h>
   85 
   86 CTASSERT(sizeof(struct ia32_mcontext) == 640);
   87 CTASSERT(sizeof(struct ia32_ucontext) == 704);
   88 CTASSERT(sizeof(struct ia32_sigframe) == 800);
   89 CTASSERT(sizeof(struct siginfo32) == 64);
   90 #ifdef COMPAT_FREEBSD4
   91 CTASSERT(sizeof(struct ia32_mcontext4) == 260);
   92 CTASSERT(sizeof(struct ia32_ucontext4) == 324);
   93 CTASSERT(sizeof(struct ia32_sigframe4) == 408);
   94 #endif
   95 
   96 extern const char *freebsd32_syscallnames[];
   97 
   98 SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode");
   99 
  100 static u_long   ia32_maxdsiz = IA32_MAXDSIZ;
  101 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, "");
  102 TUNABLE_ULONG("compat.ia32.maxdsiz", &ia32_maxdsiz);
  103 u_long  ia32_maxssiz = IA32_MAXSSIZ;
  104 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, "");
  105 TUNABLE_ULONG("compat.ia32.maxssiz", &ia32_maxssiz);
  106 static u_long   ia32_maxvmem = IA32_MAXVMEM;
  107 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, "");
  108 TUNABLE_ULONG("compat.ia32.maxvmem", &ia32_maxvmem);
  109 
  110 struct sysentvec ia32_freebsd_sysvec = {
  111         .sv_size        = FREEBSD32_SYS_MAXSYSCALL,
  112         .sv_table       = freebsd32_sysent,
  113         .sv_mask        = 0,
  114         .sv_sigsize     = 0,
  115         .sv_sigtbl      = NULL,
  116         .sv_errsize     = 0,
  117         .sv_errtbl      = NULL,
  118         .sv_transtrap   = NULL,
  119         .sv_fixup       = elf32_freebsd_fixup,
  120         .sv_sendsig     = ia32_sendsig,
  121         .sv_sigcode     = ia32_sigcode,
  122         .sv_szsigcode   = &sz_ia32_sigcode,
  123         .sv_prepsyscall = NULL,
  124         .sv_name        = "FreeBSD ELF32",
  125         .sv_coredump    = elf32_coredump,
  126         .sv_imgact_try  = NULL,
  127         .sv_minsigstksz = MINSIGSTKSZ,
  128         .sv_pagesize    = IA32_PAGE_SIZE,
  129         .sv_minuser     = 0,
  130         .sv_maxuser     = FREEBSD32_MAXUSER,
  131         .sv_usrstack    = FREEBSD32_USRSTACK,
  132         .sv_psstrings   = FREEBSD32_PS_STRINGS,
  133         .sv_stackprot   = VM_PROT_ALL,
  134         .sv_copyout_strings     = freebsd32_copyout_strings,
  135         .sv_setregs     = ia32_setregs,
  136         .sv_fixlimit    = ia32_fixlimit,
  137         .sv_maxssiz     = &ia32_maxssiz,
  138         .sv_flags       = SV_ABI_FREEBSD | SV_IA32 | SV_ILP32 |
  139 #ifdef __amd64__
  140                 SV_SHP
  141 #else
  142                 0
  143 #endif
  144         ,
  145         .sv_set_syscall_retval = ia32_set_syscall_retval,
  146         .sv_fetch_syscall_args = ia32_fetch_syscall_args,
  147         .sv_syscallnames = freebsd32_syscallnames,
  148         .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
  149         .sv_shared_page_len = PAGE_SIZE,
  150         .sv_schedtail   = NULL,
  151 };
  152 INIT_SYSENTVEC(elf_ia32_sysvec, &ia32_freebsd_sysvec);
  153 
  154 static Elf32_Brandinfo ia32_brand_info = {
  155         .brand          = ELFOSABI_FREEBSD,
  156         .machine        = EM_386,
  157         .compat_3_brand = "FreeBSD",
  158         .emul_path      = NULL,
  159         .interp_path    = "/libexec/ld-elf.so.1",
  160         .sysvec         = &ia32_freebsd_sysvec,
  161         .interp_newpath = "/libexec/ld-elf32.so.1",
  162         .brand_note     = &elf32_freebsd_brandnote,
  163         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  164 };
  165 
  166 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_MIDDLE,
  167         (sysinit_cfunc_t) elf32_insert_brand_entry,
  168         &ia32_brand_info);
  169 
  170 static Elf32_Brandinfo ia32_brand_oinfo = {
  171         .brand          = ELFOSABI_FREEBSD,
  172         .machine        = EM_386,
  173         .compat_3_brand = "FreeBSD",
  174         .emul_path      = NULL,
  175         .interp_path    = "/usr/libexec/ld-elf.so.1",
  176         .sysvec         = &ia32_freebsd_sysvec,
  177         .interp_newpath = "/libexec/ld-elf32.so.1",
  178         .brand_note     = &elf32_freebsd_brandnote,
  179         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  180 };
  181 
  182 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
  183         (sysinit_cfunc_t) elf32_insert_brand_entry,
  184         &ia32_brand_oinfo);
  185 
  186 static Elf32_Brandinfo kia32_brand_info = {
  187         .brand          = ELFOSABI_FREEBSD,
  188         .machine        = EM_386,
  189         .compat_3_brand = "FreeBSD",
  190         .emul_path      = NULL,
  191         .interp_path    = "/lib/ld.so.1",
  192         .sysvec         = &ia32_freebsd_sysvec,
  193         .brand_note     = &elf32_kfreebsd_brandnote,
  194         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  195 };
  196 
  197 SYSINIT(kia32, SI_SUB_EXEC, SI_ORDER_ANY,
  198         (sysinit_cfunc_t) elf32_insert_brand_entry,
  199         &kia32_brand_info);
  200 
  201 void
  202 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  203     size_t *off __unused)
  204 {
  205 }
  206 
  207 void
  208 ia32_fixlimit(struct rlimit *rl, int which)
  209 {
  210 
  211         switch (which) {
  212         case RLIMIT_DATA:
  213                 if (ia32_maxdsiz != 0) {
  214                         if (rl->rlim_cur > ia32_maxdsiz)
  215                                 rl->rlim_cur = ia32_maxdsiz;
  216                         if (rl->rlim_max > ia32_maxdsiz)
  217                                 rl->rlim_max = ia32_maxdsiz;
  218                 }
  219                 break;
  220         case RLIMIT_STACK:
  221                 if (ia32_maxssiz != 0) {
  222                         if (rl->rlim_cur > ia32_maxssiz)
  223                                 rl->rlim_cur = ia32_maxssiz;
  224                         if (rl->rlim_max > ia32_maxssiz)
  225                                 rl->rlim_max = ia32_maxssiz;
  226                 }
  227                 break;
  228         case RLIMIT_VMEM:
  229                 if (ia32_maxvmem != 0) {
  230                         if (rl->rlim_cur > ia32_maxvmem)
  231                                 rl->rlim_cur = ia32_maxvmem;
  232                         if (rl->rlim_max > ia32_maxvmem)
  233                                 rl->rlim_max = ia32_maxvmem;
  234                 }
  235                 break;
  236         }
  237 }

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