ia32_sysvec.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2002 Doug Rabson
    5  * Copyright (c) 2003 Peter Wemm
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   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/proc.h>
   46 #include <sys/procfs.h>
   47 #include <sys/resourcevar.h>
   48 #include <sys/systm.h>
   49 #include <sys/signalvar.h>
   50 #include <sys/stat.h>
   51 #include <sys/sx.h>
   52 #include <sys/syscall.h>
   53 #include <sys/sysctl.h>
   54 #include <sys/sysent.h>
   55 #include <sys/vnode.h>
   56 #include <sys/imgact_elf.h>
   57 
   58 #include <vm/vm.h>
   59 #include <vm/vm_kern.h>
   60 #include <vm/vm_param.h>
   61 #include <vm/pmap.h>
   62 #include <vm/vm_map.h>
   63 #include <vm/vm_object.h>
   64 #include <vm/vm_extern.h>
   65 
   66 #include <compat/freebsd32/freebsd32_signal.h>
   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/frame.h>
   72 #include <machine/md_var.h>
   73 #include <machine/pcb.h>
   74 #include <machine/cpufunc.h>
   75 
   76 CTASSERT(sizeof(struct ia32_mcontext) == 640);
   77 CTASSERT(sizeof(struct ia32_ucontext) == 704);
   78 CTASSERT(sizeof(struct ia32_sigframe) == 800);
   79 CTASSERT(sizeof(struct siginfo32) == 64);
   80 #ifdef COMPAT_FREEBSD4
   81 CTASSERT(sizeof(struct ia32_mcontext4) == 260);
   82 CTASSERT(sizeof(struct ia32_ucontext4) == 324);
   83 CTASSERT(sizeof(struct ia32_sigframe4) == 408);
   84 #endif
   85 
   86 extern const char *freebsd32_syscallnames[];
   87 
   88 static SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
   89     "ia32 mode");
   90 
   91 static u_long   ia32_maxdsiz = IA32_MAXDSIZ;
   92 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RWTUN, &ia32_maxdsiz, 0, "");
   93 u_long  ia32_maxssiz = IA32_MAXSSIZ;
   94 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RWTUN, &ia32_maxssiz, 0, "");
   95 static u_long   ia32_maxvmem = IA32_MAXVMEM;
   96 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RWTUN, &ia32_maxvmem, 0, "");
   97 
   98 struct sysentvec ia32_freebsd_sysvec = {
   99         .sv_size        = FREEBSD32_SYS_MAXSYSCALL,
  100         .sv_table       = freebsd32_sysent,
  101         .sv_transtrap   = NULL,
  102         .sv_fixup       = elf32_freebsd_fixup,
  103         .sv_sendsig     = ia32_sendsig,
  104         .sv_sigcode     = ia32_sigcode,
  105         .sv_szsigcode   = &sz_ia32_sigcode,
  106         .sv_name        = "FreeBSD ELF32",
  107         .sv_coredump    = elf32_coredump,
  108         .sv_imgact_try  = NULL,
  109         .sv_minsigstksz = MINSIGSTKSZ,
  110         .sv_minuser     = FREEBSD32_MINUSER,
  111         .sv_maxuser     = FREEBSD32_MAXUSER,
  112         .sv_usrstack    = FREEBSD32_USRSTACK,
  113         .sv_psstrings   = FREEBSD32_PS_STRINGS,
  114         .sv_stackprot   = VM_PROT_ALL,
  115         .sv_copyout_auxargs     = elf32_freebsd_copyout_auxargs,
  116         .sv_copyout_strings     = freebsd32_copyout_strings,
  117         .sv_setregs     = ia32_setregs,
  118         .sv_fixlimit    = ia32_fixlimit,
  119         .sv_maxssiz     = &ia32_maxssiz,
  120         .sv_flags       = SV_ABI_FREEBSD | SV_ASLR | SV_IA32 | SV_ILP32 |
  121                             SV_SHP | SV_TIMEKEEP | SV_RNG_SEED_VER,
  122         .sv_set_syscall_retval = ia32_set_syscall_retval,
  123         .sv_fetch_syscall_args = ia32_fetch_syscall_args,
  124         .sv_syscallnames = freebsd32_syscallnames,
  125         .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
  126         .sv_shared_page_len = PAGE_SIZE,
  127         .sv_schedtail   = NULL,
  128         .sv_thread_detach = NULL,
  129         .sv_trap        = NULL,
  130         .sv_stackgap    = elf32_stackgap,
  131 };
  132 INIT_SYSENTVEC(elf_ia32_sysvec, &ia32_freebsd_sysvec);
  133 
  134 static Elf32_Brandinfo ia32_brand_info = {
  135         .brand          = ELFOSABI_FREEBSD,
  136         .machine        = EM_386,
  137         .compat_3_brand = "FreeBSD",
  138         .emul_path      = NULL,
  139         .interp_path    = "/libexec/ld-elf.so.1",
  140         .sysvec         = &ia32_freebsd_sysvec,
  141         .interp_newpath = "/libexec/ld-elf32.so.1",
  142         .brand_note     = &elf32_freebsd_brandnote,
  143         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  144 };
  145 
  146 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_MIDDLE,
  147         (sysinit_cfunc_t) elf32_insert_brand_entry,
  148         &ia32_brand_info);
  149 
  150 static Elf32_Brandinfo ia32_brand_oinfo = {
  151         .brand          = ELFOSABI_FREEBSD,
  152         .machine        = EM_386,
  153         .compat_3_brand = "FreeBSD",
  154         .emul_path      = NULL,
  155         .interp_path    = "/usr/libexec/ld-elf.so.1",
  156         .sysvec         = &ia32_freebsd_sysvec,
  157         .interp_newpath = "/libexec/ld-elf32.so.1",
  158         .brand_note     = &elf32_freebsd_brandnote,
  159         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  160 };
  161 
  162 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
  163         (sysinit_cfunc_t) elf32_insert_brand_entry,
  164         &ia32_brand_oinfo);
  165 
  166 static Elf32_Brandinfo kia32_brand_info = {
  167         .brand          = ELFOSABI_FREEBSD,
  168         .machine        = EM_386,
  169         .compat_3_brand = "FreeBSD",
  170         .emul_path      = NULL,
  171         .interp_path    = "/lib/ld.so.1",
  172         .sysvec         = &ia32_freebsd_sysvec,
  173         .brand_note     = &elf32_kfreebsd_brandnote,
  174         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  175 };
  176 
  177 SYSINIT(kia32, SI_SUB_EXEC, SI_ORDER_ANY,
  178         (sysinit_cfunc_t) elf32_insert_brand_entry,
  179         &kia32_brand_info);
  180 
  181 void
  182 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
  183 {
  184         void *buf;
  185         size_t len;
  186 
  187         len = 0;
  188         if (use_xsave) {
  189                 if (dst != NULL) {
  190                         fpugetregs(td);
  191                         len += elf32_populate_note(NT_X86_XSTATE,
  192                             get_pcb_user_save_td(td), dst,
  193                             cpu_max_ext_state_size, &buf);
  194                         *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
  195                             xsave_mask;
  196                 } else
  197                         len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
  198                             cpu_max_ext_state_size, NULL);
  199         }
  200         *off = len;
  201 }
  202 
  203 void
  204 ia32_fixlimit(struct rlimit *rl, int which)
  205 {
  206 
  207         switch (which) {
  208         case RLIMIT_DATA:
  209                 if (ia32_maxdsiz != 0) {
  210                         if (rl->rlim_cur > ia32_maxdsiz)
  211                                 rl->rlim_cur = ia32_maxdsiz;
  212                         if (rl->rlim_max > ia32_maxdsiz)
  213                                 rl->rlim_max = ia32_maxdsiz;
  214                 }
  215                 break;
  216         case RLIMIT_STACK:
  217                 if (ia32_maxssiz != 0) {
  218                         if (rl->rlim_cur > ia32_maxssiz)
  219                                 rl->rlim_cur = ia32_maxssiz;
  220                         if (rl->rlim_max > ia32_maxssiz)
  221                                 rl->rlim_max = ia32_maxssiz;
  222                 }
  223                 break;
  224         case RLIMIT_VMEM:
  225                 if (ia32_maxvmem != 0) {
  226                         if (rl->rlim_cur > ia32_maxvmem)
  227                                 rl->rlim_cur = ia32_maxvmem;
  228                         if (rl->rlim_max > ia32_maxvmem)
  229                                 rl->rlim_max = ia32_maxvmem;
  230                 }
  231                 break;
  232         }
  233 }

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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