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/elf.h>
   37 #include <sys/exec.h>
   38 #include <sys/fcntl.h>
   39 #include <sys/imgact.h>
   40 #include <sys/kernel.h>
   41 #include <sys/lock.h>
   42 #include <sys/malloc.h>
   43 #include <sys/mutex.h>
   44 #include <sys/mman.h>
   45 #include <sys/namei.h>
   46 #include <sys/proc.h>
   47 #include <sys/procfs.h>
   48 #include <sys/reg.h>
   49 #include <sys/resourcevar.h>
   50 #include <sys/systm.h>
   51 #include <sys/signalvar.h>
   52 #include <sys/stat.h>
   53 #include <sys/sx.h>
   54 #include <sys/syscall.h>
   55 #include <sys/sysctl.h>
   56 #include <sys/sysent.h>
   57 #include <sys/vnode.h>
   58 #include <sys/imgact_elf.h>
   59 
   60 #include <vm/vm.h>
   61 #include <vm/vm_kern.h>
   62 #include <vm/vm_param.h>
   63 #include <vm/pmap.h>
   64 #include <vm/vm_map.h>
   65 #include <vm/vm_object.h>
   66 #include <vm/vm_extern.h>
   67 
   68 #include <compat/freebsd32/freebsd32_signal.h>
   69 #include <compat/freebsd32/freebsd32_util.h>
   70 #include <compat/freebsd32/freebsd32_proto.h>
   71 #include <compat/freebsd32/freebsd32_syscall.h>
   72 #include <compat/ia32/ia32_signal.h>
   73 #include <machine/frame.h>
   74 #include <machine/md_var.h>
   75 #include <machine/pcb.h>
   76 #include <machine/cpufunc.h>
   77 
   78 CTASSERT(sizeof(struct ia32_mcontext) == 640);
   79 CTASSERT(sizeof(struct ia32_ucontext) == 704);
   80 CTASSERT(sizeof(struct ia32_sigframe) == 800);
   81 CTASSERT(sizeof(struct siginfo32) == 64);
   82 #ifdef COMPAT_FREEBSD4
   83 CTASSERT(sizeof(struct ia32_mcontext4) == 260);
   84 CTASSERT(sizeof(struct ia32_ucontext4) == 324);
   85 CTASSERT(sizeof(struct ia32_sigframe4) == 408);
   86 #endif
   87 
   88 #include "vdso_ia32_offsets.h"
   89 
   90 extern const char _binary_elf_vdso32_so_1_start[];
   91 extern const char _binary_elf_vdso32_so_1_end[];
   92 extern char _binary_elf_vdso32_so_1_size;
   93 
   94 extern const char *freebsd32_syscallnames[];
   95 
   96 static SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
   97     "ia32 mode");
   98 
   99 static u_long   ia32_maxdsiz = IA32_MAXDSIZ;
  100 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RWTUN, &ia32_maxdsiz, 0, "");
  101 u_long  ia32_maxssiz = IA32_MAXSSIZ;
  102 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RWTUN, &ia32_maxssiz, 0, "");
  103 static u_long   ia32_maxvmem = IA32_MAXVMEM;
  104 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RWTUN, &ia32_maxvmem, 0, "");
  105 
  106 struct sysentvec ia32_freebsd_sysvec = {
  107         .sv_size        = FREEBSD32_SYS_MAXSYSCALL,
  108         .sv_table       = freebsd32_sysent,
  109         .sv_fixup       = elf32_freebsd_fixup,
  110         .sv_sendsig     = ia32_sendsig,
  111         .sv_sigcode     = _binary_elf_vdso32_so_1_start,
  112         .sv_szsigcode   = (int *)&_binary_elf_vdso32_so_1_size,
  113         .sv_sigcodeoff  = VDSO_IA32_SIGCODE_OFFSET,
  114         .sv_name        = "FreeBSD ELF32",
  115         .sv_coredump    = elf32_coredump,
  116         .sv_elf_core_osabi = ELFOSABI_FREEBSD,
  117         .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR,
  118         .sv_elf_core_prepare_notes = elf32_prepare_notes,
  119         .sv_imgact_try  = NULL,
  120         .sv_minsigstksz = MINSIGSTKSZ,
  121         .sv_minuser     = FREEBSD32_MINUSER,
  122         .sv_maxuser     = FREEBSD32_MAXUSER,
  123         .sv_usrstack    = FREEBSD32_USRSTACK,
  124         .sv_psstrings   = FREEBSD32_PS_STRINGS,
  125         .sv_psstringssz = sizeof(struct freebsd32_ps_strings),
  126         .sv_stackprot   = VM_PROT_ALL,
  127         .sv_copyout_auxargs     = elf32_freebsd_copyout_auxargs,
  128         .sv_copyout_strings     = freebsd32_copyout_strings,
  129         .sv_setregs     = ia32_setregs,
  130         .sv_fixlimit    = ia32_fixlimit,
  131         .sv_maxssiz     = &ia32_maxssiz,
  132         .sv_flags       = SV_ABI_FREEBSD | SV_ASLR | SV_IA32 | SV_ILP32 |
  133                             SV_SHP | SV_TIMEKEEP | SV_RNG_SEED_VER | SV_DSO_SIG,
  134         .sv_set_syscall_retval = ia32_set_syscall_retval,
  135         .sv_fetch_syscall_args = ia32_fetch_syscall_args,
  136         .sv_syscallnames = freebsd32_syscallnames,
  137         .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
  138         .sv_shared_page_len = PAGE_SIZE,
  139         .sv_schedtail   = NULL,
  140         .sv_thread_detach = NULL,
  141         .sv_trap        = NULL,
  142         .sv_onexec_old  = exec_onexec_old,
  143         .sv_onexit      = exit_onexit,
  144         .sv_regset_begin = SET_BEGIN(__elfN(regset)),
  145         .sv_regset_end  = SET_LIMIT(__elfN(regset)),
  146         .sv_set_fork_retval = x86_set_fork_retval,
  147 };
  148 INIT_SYSENTVEC(elf_ia32_sysvec, &ia32_freebsd_sysvec);
  149 
  150 static Elf32_Brandinfo ia32_brand_info = {
  151         .brand          = ELFOSABI_FREEBSD,
  152         .machine        = EM_386,
  153         .compat_3_brand = "FreeBSD",
  154         .emul_path      = NULL,
  155         .interp_path    = "/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(ia32, SI_SUB_EXEC, SI_ORDER_MIDDLE,
  163         (sysinit_cfunc_t) elf32_insert_brand_entry,
  164         &ia32_brand_info);
  165 
  166 static Elf32_Brandinfo ia32_brand_oinfo = {
  167         .brand          = ELFOSABI_FREEBSD,
  168         .machine        = EM_386,
  169         .compat_3_brand = "FreeBSD",
  170         .emul_path      = NULL,
  171         .interp_path    = "/usr/libexec/ld-elf.so.1",
  172         .sysvec         = &ia32_freebsd_sysvec,
  173         .interp_newpath = "/libexec/ld-elf32.so.1",
  174         .brand_note     = &elf32_freebsd_brandnote,
  175         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  176 };
  177 
  178 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY,
  179         (sysinit_cfunc_t) elf32_insert_brand_entry,
  180         &ia32_brand_oinfo);
  181 
  182 static Elf32_Brandinfo kia32_brand_info = {
  183         .brand          = ELFOSABI_FREEBSD,
  184         .machine        = EM_386,
  185         .compat_3_brand = "FreeBSD",
  186         .emul_path      = NULL,
  187         .interp_path    = "/lib/ld.so.1",
  188         .sysvec         = &ia32_freebsd_sysvec,
  189         .brand_note     = &elf32_kfreebsd_brandnote,
  190         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  191 };
  192 
  193 SYSINIT(kia32, SI_SUB_EXEC, SI_ORDER_ANY,
  194         (sysinit_cfunc_t) elf32_insert_brand_entry,
  195         &kia32_brand_info);
  196 
  197 void
  198 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
  199 {
  200         void *buf;
  201         size_t len;
  202 
  203         len = 0;
  204         if (use_xsave) {
  205                 if (dst != NULL) {
  206                         fpugetregs(td);
  207                         len += elf32_populate_note(NT_X86_XSTATE,
  208                             get_pcb_user_save_td(td), dst,
  209                             cpu_max_ext_state_size, &buf);
  210                         *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
  211                             xsave_mask;
  212                 } else
  213                         len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
  214                             cpu_max_ext_state_size, NULL);
  215         }
  216         *off = len;
  217 }
  218 
  219 void
  220 ia32_fixlimit(struct rlimit *rl, int which)
  221 {
  222 
  223         switch (which) {
  224         case RLIMIT_DATA:
  225                 if (ia32_maxdsiz != 0) {
  226                         if (rl->rlim_cur > ia32_maxdsiz)
  227                                 rl->rlim_cur = ia32_maxdsiz;
  228                         if (rl->rlim_max > ia32_maxdsiz)
  229                                 rl->rlim_max = ia32_maxdsiz;
  230                 }
  231                 break;
  232         case RLIMIT_STACK:
  233                 if (ia32_maxssiz != 0) {
  234                         if (rl->rlim_cur > ia32_maxssiz)
  235                                 rl->rlim_cur = ia32_maxssiz;
  236                         if (rl->rlim_max > ia32_maxssiz)
  237                                 rl->rlim_max = ia32_maxssiz;
  238                 }
  239                 break;
  240         case RLIMIT_VMEM:
  241                 if (ia32_maxvmem != 0) {
  242                         if (rl->rlim_cur > ia32_maxvmem)
  243                                 rl->rlim_cur = ia32_maxvmem;
  244                         if (rl->rlim_max > ia32_maxvmem)
  245                                 rl->rlim_max = ia32_maxvmem;
  246                 }
  247                 break;
  248         }
  249 }

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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