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/10.2/sys/compat/ia32/ia32_sysvec.c 283646 2015-05-28 13:12:05Z jhb $");
   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 #include <machine/frame.h>
   73 #include <machine/md_var.h>
   74 #include <machine/pcb.h>
   75 #include <machine/cpufunc.h>
   76 
   77 CTASSERT(sizeof(struct ia32_mcontext) == 640);
   78 CTASSERT(sizeof(struct ia32_ucontext) == 704);
   79 CTASSERT(sizeof(struct ia32_sigframe) == 800);
   80 CTASSERT(sizeof(struct siginfo32) == 64);
   81 #ifdef COMPAT_FREEBSD4
   82 CTASSERT(sizeof(struct ia32_mcontext4) == 260);
   83 CTASSERT(sizeof(struct ia32_ucontext4) == 324);
   84 CTASSERT(sizeof(struct ia32_sigframe4) == 408);
   85 #endif
   86 
   87 extern const char *freebsd32_syscallnames[];
   88 
   89 static SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode");
   90 
   91 static u_long   ia32_maxdsiz = IA32_MAXDSIZ;
   92 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, "");
   93 TUNABLE_ULONG("compat.ia32.maxdsiz", &ia32_maxdsiz);
   94 u_long  ia32_maxssiz = IA32_MAXSSIZ;
   95 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, "");
   96 TUNABLE_ULONG("compat.ia32.maxssiz", &ia32_maxssiz);
   97 static u_long   ia32_maxvmem = IA32_MAXVMEM;
   98 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, "");
   99 TUNABLE_ULONG("compat.ia32.maxvmem", &ia32_maxvmem);
  100 
  101 struct sysentvec ia32_freebsd_sysvec = {
  102         .sv_size        = FREEBSD32_SYS_MAXSYSCALL,
  103         .sv_table       = freebsd32_sysent,
  104         .sv_mask        = 0,
  105         .sv_sigsize     = 0,
  106         .sv_sigtbl      = NULL,
  107         .sv_errsize     = 0,
  108         .sv_errtbl      = NULL,
  109         .sv_transtrap   = NULL,
  110         .sv_fixup       = elf32_freebsd_fixup,
  111         .sv_sendsig     = ia32_sendsig,
  112         .sv_sigcode     = ia32_sigcode,
  113         .sv_szsigcode   = &sz_ia32_sigcode,
  114         .sv_prepsyscall = NULL,
  115         .sv_name        = "FreeBSD ELF32",
  116         .sv_coredump    = elf32_coredump,
  117         .sv_imgact_try  = NULL,
  118         .sv_minsigstksz = MINSIGSTKSZ,
  119         .sv_pagesize    = IA32_PAGE_SIZE,
  120         .sv_minuser     = FREEBSD32_MINUSER,
  121         .sv_maxuser     = FREEBSD32_MAXUSER,
  122         .sv_usrstack    = FREEBSD32_USRSTACK,
  123         .sv_psstrings   = FREEBSD32_PS_STRINGS,
  124         .sv_stackprot   = VM_PROT_ALL,
  125         .sv_copyout_strings     = freebsd32_copyout_strings,
  126         .sv_setregs     = ia32_setregs,
  127         .sv_fixlimit    = ia32_fixlimit,
  128         .sv_maxssiz     = &ia32_maxssiz,
  129         .sv_flags       = SV_ABI_FREEBSD | SV_IA32 | SV_ILP32 |
  130 #ifdef __amd64__
  131                 SV_SHP
  132 #else
  133                 0
  134 #endif
  135         ,
  136         .sv_set_syscall_retval = ia32_set_syscall_retval,
  137         .sv_fetch_syscall_args = ia32_fetch_syscall_args,
  138         .sv_syscallnames = freebsd32_syscallnames,
  139         .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
  140         .sv_shared_page_len = PAGE_SIZE,
  141         .sv_schedtail   = NULL,
  142 };
  143 INIT_SYSENTVEC(elf_ia32_sysvec, &ia32_freebsd_sysvec);
  144 
  145 static Elf32_Brandinfo ia32_brand_info = {
  146         .brand          = ELFOSABI_FREEBSD,
  147         .machine        = EM_386,
  148         .compat_3_brand = "FreeBSD",
  149         .emul_path      = NULL,
  150         .interp_path    = "/libexec/ld-elf.so.1",
  151         .sysvec         = &ia32_freebsd_sysvec,
  152         .interp_newpath = "/libexec/ld-elf32.so.1",
  153         .brand_note     = &elf32_freebsd_brandnote,
  154         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  155 };
  156 
  157 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_MIDDLE,
  158         (sysinit_cfunc_t) elf32_insert_brand_entry,
  159         &ia32_brand_info);
  160 
  161 static Elf32_Brandinfo ia32_brand_oinfo = {
  162         .brand          = ELFOSABI_FREEBSD,
  163         .machine        = EM_386,
  164         .compat_3_brand = "FreeBSD",
  165         .emul_path      = NULL,
  166         .interp_path    = "/usr/libexec/ld-elf.so.1",
  167         .sysvec         = &ia32_freebsd_sysvec,
  168         .interp_newpath = "/libexec/ld-elf32.so.1",
  169         .brand_note     = &elf32_freebsd_brandnote,
  170         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  171 };
  172 
  173 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
  174         (sysinit_cfunc_t) elf32_insert_brand_entry,
  175         &ia32_brand_oinfo);
  176 
  177 static Elf32_Brandinfo kia32_brand_info = {
  178         .brand          = ELFOSABI_FREEBSD,
  179         .machine        = EM_386,
  180         .compat_3_brand = "FreeBSD",
  181         .emul_path      = NULL,
  182         .interp_path    = "/lib/ld.so.1",
  183         .sysvec         = &ia32_freebsd_sysvec,
  184         .brand_note     = &elf32_kfreebsd_brandnote,
  185         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  186 };
  187 
  188 SYSINIT(kia32, SI_SUB_EXEC, SI_ORDER_ANY,
  189         (sysinit_cfunc_t) elf32_insert_brand_entry,
  190         &kia32_brand_info);
  191 
  192 void
  193 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
  194 {
  195 #ifdef __amd64__
  196         void *buf;
  197         size_t len;
  198 
  199         len = 0;
  200         if (use_xsave) {
  201                 if (dst != NULL) {
  202                         fpugetregs(td);
  203                         len += elf32_populate_note(NT_X86_XSTATE,
  204                             get_pcb_user_save_td(td), dst,
  205                             cpu_max_ext_state_size, &buf);
  206                         *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
  207                             xsave_mask;
  208                 } else
  209                         len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
  210                             cpu_max_ext_state_size, NULL);
  211         }
  212         *off = len;
  213 #endif
  214 }
  215 
  216 void
  217 ia32_fixlimit(struct rlimit *rl, int which)
  218 {
  219 
  220         switch (which) {
  221         case RLIMIT_DATA:
  222                 if (ia32_maxdsiz != 0) {
  223                         if (rl->rlim_cur > ia32_maxdsiz)
  224                                 rl->rlim_cur = ia32_maxdsiz;
  225                         if (rl->rlim_max > ia32_maxdsiz)
  226                                 rl->rlim_max = ia32_maxdsiz;
  227                 }
  228                 break;
  229         case RLIMIT_STACK:
  230                 if (ia32_maxssiz != 0) {
  231                         if (rl->rlim_cur > ia32_maxssiz)
  232                                 rl->rlim_cur = ia32_maxssiz;
  233                         if (rl->rlim_max > ia32_maxssiz)
  234                                 rl->rlim_max = ia32_maxssiz;
  235                 }
  236                 break;
  237         case RLIMIT_VMEM:
  238                 if (ia32_maxvmem != 0) {
  239                         if (rl->rlim_cur > ia32_maxvmem)
  240                                 rl->rlim_cur = ia32_maxvmem;
  241                         if (rl->rlim_max > ia32_maxvmem)
  242                                 rl->rlim_max = ia32_maxvmem;
  243                 }
  244                 break;
  245         }
  246 }

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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