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/arm64/arm64/elf_machdep.c

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    1 /*-
    2  * Copyright (c) 2014, 2015 The FreeBSD Foundation.
    3  * Copyright (c) 2014 Andrew Turner.
    4  * All rights reserved.
    5  *
    6  * This software was developed by Andrew Turner under
    7  * sponsorship from the FreeBSD Foundation.
    8  *
    9  * Portions of this software were developed by Konstantin Belousov
   10  * under sponsorship from the FreeBSD Foundation.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/11.2/sys/arm64/arm64/elf_machdep.c 293613 2016-01-09 20:18:53Z dchagin $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/kernel.h>
   39 #include <sys/systm.h>
   40 #include <sys/exec.h>
   41 #include <sys/imgact.h>
   42 #include <sys/linker.h>
   43 #include <sys/proc.h>
   44 #include <sys/sysent.h>
   45 #include <sys/imgact_elf.h>
   46 #include <sys/syscall.h>
   47 #include <sys/signalvar.h>
   48 #include <sys/vnode.h>
   49 
   50 #include <vm/vm.h>
   51 #include <vm/vm_param.h>
   52 
   53 #include <machine/elf.h>
   54 #include <machine/md_var.h>
   55 
   56 #include "linker_if.h"
   57 
   58 static struct sysentvec elf64_freebsd_sysvec = {
   59         .sv_size        = SYS_MAXSYSCALL,
   60         .sv_table       = sysent,
   61         .sv_mask        = 0,
   62         .sv_errsize     = 0,
   63         .sv_errtbl      = NULL,
   64         .sv_transtrap   = NULL,
   65         .sv_fixup       = __elfN(freebsd_fixup),
   66         .sv_sendsig     = sendsig,
   67         .sv_sigcode     = sigcode,
   68         .sv_szsigcode   = &szsigcode,
   69         .sv_name        = "FreeBSD ELF64",
   70         .sv_coredump    = __elfN(coredump),
   71         .sv_imgact_try  = NULL,
   72         .sv_minsigstksz = MINSIGSTKSZ,
   73         .sv_pagesize    = PAGE_SIZE,
   74         .sv_minuser     = VM_MIN_ADDRESS,
   75         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   76         .sv_usrstack    = USRSTACK,
   77         .sv_psstrings   = PS_STRINGS,
   78         .sv_stackprot   = VM_PROT_READ | VM_PROT_WRITE,
   79         .sv_copyout_strings = exec_copyout_strings,
   80         .sv_setregs     = exec_setregs,
   81         .sv_fixlimit    = NULL,
   82         .sv_maxssiz     = NULL,
   83         .sv_flags       = SV_SHP | SV_TIMEKEEP | SV_ABI_FREEBSD | SV_LP64,
   84         .sv_set_syscall_retval = cpu_set_syscall_retval,
   85         .sv_fetch_syscall_args = cpu_fetch_syscall_args,
   86         .sv_syscallnames = syscallnames,
   87         .sv_shared_page_base = SHAREDPAGE,
   88         .sv_shared_page_len = PAGE_SIZE,
   89         .sv_schedtail   = NULL,
   90         .sv_thread_detach = NULL,
   91         .sv_trap        = NULL,
   92 };
   93 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
   94 
   95 static Elf64_Brandinfo freebsd_brand_info = {
   96         .brand          = ELFOSABI_FREEBSD,
   97         .machine        = EM_AARCH64,
   98         .compat_3_brand = "FreeBSD",
   99         .emul_path      = NULL,
  100         .interp_path    = "/libexec/ld-elf.so.1",
  101         .sysvec         = &elf64_freebsd_sysvec,
  102         .interp_newpath = NULL,
  103         .brand_note     = &elf64_freebsd_brandnote,
  104         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  105 };
  106 
  107 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
  108     (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_info);
  109 
  110 static Elf64_Brandinfo freebsd_brand_oinfo = {
  111         .brand          = ELFOSABI_FREEBSD,
  112         .machine        = EM_AARCH64,
  113         .compat_3_brand = "FreeBSD",
  114         .emul_path      = NULL,
  115         .interp_path    = "/usr/libexec/ld-elf.so.1",
  116         .sysvec         = &elf64_freebsd_sysvec,
  117         .interp_newpath = NULL,
  118         .brand_note     = &elf64_freebsd_brandnote,
  119         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  120 };
  121 
  122 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  123     (sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_oinfo);
  124 
  125 void
  126 elf64_dump_thread(struct thread *td __unused, void *dst __unused,
  127     size_t *off __unused)
  128 {
  129 
  130 }
  131 
  132 static int
  133 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  134     int type, int local, elf_lookup_fn lookup)
  135 {
  136         Elf_Addr *where, addr, addend;
  137         Elf_Word rtype, symidx;
  138         const Elf_Rel *rel;
  139         const Elf_Rela *rela;
  140         int error;
  141 
  142         switch (type) {
  143         case ELF_RELOC_REL:
  144                 rel = (const Elf_Rel *)data;
  145                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  146                 addend = *where;
  147                 rtype = ELF_R_TYPE(rel->r_info);
  148                 symidx = ELF_R_SYM(rel->r_info);
  149                 break;
  150         case ELF_RELOC_RELA:
  151                 rela = (const Elf_Rela *)data;
  152                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  153                 addend = rela->r_addend;
  154                 rtype = ELF_R_TYPE(rela->r_info);
  155                 symidx = ELF_R_SYM(rela->r_info);
  156                 break;
  157         default:
  158                 panic("unknown reloc type %d\n", type);
  159         }
  160 
  161         if (local) {
  162                 if (rtype == R_AARCH64_RELATIVE)
  163                         *where = elf_relocaddr(lf, relocbase + addend);
  164                 return (0);
  165         }
  166 
  167         switch (rtype) {
  168         case R_AARCH64_NONE:
  169         case R_AARCH64_RELATIVE:
  170                 break;
  171         case R_AARCH64_ABS64:
  172         case R_AARCH64_GLOB_DAT:
  173         case R_AARCH64_JUMP_SLOT:
  174                 error = lookup(lf, symidx, 1, &addr);
  175                 if (error != 0)
  176                         return (-1);
  177                 *where = addr + addend;
  178                 break;
  179         default:
  180                 printf("kldload: unexpected relocation type %d\n", rtype);
  181                 return (-1);
  182         }
  183         return (0);
  184 }
  185 
  186 int
  187 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  188     int type, elf_lookup_fn lookup)
  189 {
  190 
  191         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  192 }
  193 
  194 /* Process one elf relocation with addend. */
  195 int
  196 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  197     elf_lookup_fn lookup)
  198 {
  199 
  200         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  201 }
  202 
  203 int
  204 elf_cpu_load_file(linker_file_t lf)
  205 {
  206 
  207         if (lf->id != 1)
  208                 cpu_icache_sync_range((vm_offset_t)lf->address, lf->size);
  209         return (0);
  210 }
  211 
  212 int
  213 elf_cpu_unload_file(linker_file_t lf __unused)
  214 {
  215 
  216         return (0);
  217 }

Cache object: a90aee04fb77d2b7bfc7c0e5ab6ccea3


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