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/amd64/amd64/elf_machdep.c

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    1 /*-
    2  * Copyright 1996-1998 John D. Polstra.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/11.2/sys/amd64/amd64/elf_machdep.c 333720 2018-05-17 15:24:53Z kib $");
   28 
   29 #include <sys/param.h>
   30 #include <sys/kernel.h>
   31 #include <sys/systm.h>
   32 #include <sys/exec.h>
   33 #include <sys/imgact.h>
   34 #include <sys/linker.h>
   35 #include <sys/proc.h>
   36 #include <sys/sysent.h>
   37 #include <sys/imgact_elf.h>
   38 #include <sys/syscall.h>
   39 #include <sys/signalvar.h>
   40 #include <sys/vnode.h>
   41 
   42 #include <vm/vm.h>
   43 #include <vm/pmap.h>
   44 #include <vm/vm_param.h>
   45 
   46 #include <machine/elf.h>
   47 #include <machine/fpu.h>
   48 #include <machine/md_var.h>
   49 
   50 struct sysentvec elf64_freebsd_sysvec = {
   51         .sv_size        = SYS_MAXSYSCALL,
   52         .sv_table       = sysent,
   53         .sv_mask        = 0,
   54         .sv_errsize     = 0,
   55         .sv_errtbl      = NULL,
   56         .sv_transtrap   = NULL,
   57         .sv_fixup       = __elfN(freebsd_fixup),
   58         .sv_sendsig     = sendsig,
   59         .sv_sigcode     = sigcode,
   60         .sv_szsigcode   = &szsigcode,
   61         .sv_name        = "FreeBSD ELF64",
   62         .sv_coredump    = __elfN(coredump),
   63         .sv_imgact_try  = NULL,
   64         .sv_minsigstksz = MINSIGSTKSZ,
   65         .sv_pagesize    = PAGE_SIZE,
   66         .sv_minuser     = VM_MIN_ADDRESS,
   67         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   68         .sv_usrstack    = USRSTACK,
   69         .sv_psstrings   = PS_STRINGS,
   70         .sv_stackprot   = VM_PROT_ALL,
   71         .sv_copyout_strings     = exec_copyout_strings,
   72         .sv_setregs     = exec_setregs,
   73         .sv_fixlimit    = NULL,
   74         .sv_maxssiz     = NULL,
   75         .sv_flags       = SV_ABI_FREEBSD | SV_LP64 | SV_SHP | SV_TIMEKEEP,
   76         .sv_set_syscall_retval = cpu_set_syscall_retval,
   77         .sv_fetch_syscall_args = cpu_fetch_syscall_args,
   78         .sv_syscallnames = syscallnames,
   79         .sv_shared_page_base = SHAREDPAGE,
   80         .sv_shared_page_len = PAGE_SIZE,
   81         .sv_schedtail   = NULL,
   82         .sv_thread_detach = NULL,
   83         .sv_trap        = NULL,
   84 };
   85 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
   86 
   87 void
   88 amd64_lower_shared_page(struct sysentvec *sv)
   89 {
   90         if (hw_lower_amd64_sharedpage != 0) {
   91                 sv->sv_maxuser -= PAGE_SIZE;
   92                 sv->sv_shared_page_base -= PAGE_SIZE;
   93                 sv->sv_usrstack -= PAGE_SIZE;
   94                 sv->sv_psstrings -= PAGE_SIZE;
   95         }
   96 }
   97 
   98 /*
   99  * Do this fixup before INIT_SYSENTVEC (SI_ORDER_ANY) because the latter
  100  * uses the value of sv_shared_page_base.
  101  */
  102 SYSINIT(elf64_sysvec_fixup, SI_SUB_EXEC, SI_ORDER_FIRST,
  103         (sysinit_cfunc_t) amd64_lower_shared_page,
  104         &elf64_freebsd_sysvec);
  105 
  106 static Elf64_Brandinfo freebsd_brand_info = {
  107         .brand          = ELFOSABI_FREEBSD,
  108         .machine        = EM_X86_64,
  109         .compat_3_brand = "FreeBSD",
  110         .emul_path      = NULL,
  111         .interp_path    = "/libexec/ld-elf.so.1",
  112         .sysvec         = &elf64_freebsd_sysvec,
  113         .interp_newpath = NULL,
  114         .brand_note     = &elf64_freebsd_brandnote,
  115         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  116 };
  117 
  118 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
  119         (sysinit_cfunc_t) elf64_insert_brand_entry,
  120         &freebsd_brand_info);
  121 
  122 static Elf64_Brandinfo freebsd_brand_oinfo = {
  123         .brand          = ELFOSABI_FREEBSD,
  124         .machine        = EM_X86_64,
  125         .compat_3_brand = "FreeBSD",
  126         .emul_path      = NULL,
  127         .interp_path    = "/usr/libexec/ld-elf.so.1",
  128         .sysvec         = &elf64_freebsd_sysvec,
  129         .interp_newpath = NULL,
  130         .brand_note     = &elf64_freebsd_brandnote,
  131         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  132 };
  133 
  134 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  135         (sysinit_cfunc_t) elf64_insert_brand_entry,
  136         &freebsd_brand_oinfo);
  137 
  138 static Elf64_Brandinfo kfreebsd_brand_info = {
  139         .brand          = ELFOSABI_FREEBSD,
  140         .machine        = EM_X86_64,
  141         .compat_3_brand = "FreeBSD",
  142         .emul_path      = NULL,
  143         .interp_path    = "/lib/ld-kfreebsd-x86-64.so.1",
  144         .sysvec         = &elf64_freebsd_sysvec,
  145         .interp_newpath = NULL,
  146         .brand_note     = &elf64_kfreebsd_brandnote,
  147         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  148 };
  149 
  150 SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  151         (sysinit_cfunc_t) elf64_insert_brand_entry,
  152         &kfreebsd_brand_info);
  153 
  154 void
  155 elf64_dump_thread(struct thread *td, void *dst, size_t *off)
  156 {
  157         void *buf;
  158         size_t len;
  159 
  160         len = 0;
  161         if (use_xsave) {
  162                 if (dst != NULL) {
  163                         fpugetregs(td);
  164                         len += elf64_populate_note(NT_X86_XSTATE,
  165                             get_pcb_user_save_td(td), dst,
  166                             cpu_max_ext_state_size, &buf);
  167                         *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
  168                             xsave_mask;
  169                 } else
  170                         len += elf64_populate_note(NT_X86_XSTATE, NULL, NULL,
  171                             cpu_max_ext_state_size, NULL);
  172         }
  173         *off = len;
  174 }
  175 
  176 #define ERI_LOCAL       0x0001
  177 #define ERI_ONLYIFUNC   0x0002
  178 
  179 /* Process one elf relocation with addend. */
  180 static int
  181 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  182     int type, elf_lookup_fn lookup, int flags)
  183 {
  184         Elf64_Addr *where, val;
  185         Elf32_Addr *where32, val32;
  186         Elf_Addr addr;
  187         Elf_Addr addend;
  188         Elf_Size rtype, symidx;
  189         const Elf_Rel *rel;
  190         const Elf_Rela *rela;
  191         int error;
  192 
  193         switch (type) {
  194         case ELF_RELOC_REL:
  195                 rel = (const Elf_Rel *)data;
  196                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  197                 rtype = ELF_R_TYPE(rel->r_info);
  198                 symidx = ELF_R_SYM(rel->r_info);
  199                 /* Addend is 32 bit on 32 bit relocs */
  200                 switch (rtype) {
  201                 case R_X86_64_PC32:
  202                 case R_X86_64_32S:
  203                         addend = *(Elf32_Addr *)where;
  204                         break;
  205                 default:
  206                         addend = *where;
  207                         break;
  208                 }
  209                 break;
  210         case ELF_RELOC_RELA:
  211                 rela = (const Elf_Rela *)data;
  212                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  213                 addend = rela->r_addend;
  214                 rtype = ELF_R_TYPE(rela->r_info);
  215                 symidx = ELF_R_SYM(rela->r_info);
  216                 break;
  217         default:
  218                 panic("unknown reloc type %d\n", type);
  219         }
  220 
  221         if (((flags & ERI_ONLYIFUNC) == 0) ^ (rtype != R_X86_64_IRELATIVE))
  222                 return (0);
  223 
  224         switch (rtype) {
  225                 case R_X86_64_NONE:     /* none */
  226                         break;
  227 
  228                 case R_X86_64_64:               /* S + A */
  229                         error = lookup(lf, symidx, 1, &addr);
  230                         val = addr + addend;
  231                         if (error != 0)
  232                                 return -1;
  233                         if (*where != val)
  234                                 *where = val;
  235                         break;
  236 
  237                 case R_X86_64_PC32:     /* S + A - P */
  238                         error = lookup(lf, symidx, 1, &addr);
  239                         where32 = (Elf32_Addr *)where;
  240                         val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
  241                         if (error != 0)
  242                                 return -1;
  243                         if (*where32 != val32)
  244                                 *where32 = val32;
  245                         break;
  246 
  247                 case R_X86_64_32S:      /* S + A sign extend */
  248                         error = lookup(lf, symidx, 1, &addr);
  249                         val32 = (Elf32_Addr)(addr + addend);
  250                         where32 = (Elf32_Addr *)where;
  251                         if (error != 0)
  252                                 return -1;
  253                         if (*where32 != val32)
  254                                 *where32 = val32;
  255                         break;
  256 
  257                 case R_X86_64_COPY:     /* none */
  258                         /*
  259                          * There shouldn't be copy relocations in kernel
  260                          * objects.
  261                          */
  262                         printf("kldload: unexpected R_COPY relocation\n");
  263                         return (-1);
  264                         break;
  265 
  266                 case R_X86_64_GLOB_DAT: /* S */
  267                 case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
  268                         error = lookup(lf, symidx, 1, &addr);
  269                         if (error != 0)
  270                                 return -1;
  271                         if (*where != addr)
  272                                 *where = addr;
  273                         break;
  274 
  275                 case R_X86_64_RELATIVE: /* B + A */
  276                         addr = relocbase + addend;
  277                         val = addr;
  278                         if (*where != val)
  279                                 *where = val;
  280                         break;
  281 
  282                 case R_X86_64_IRELATIVE:
  283                         addr = relocbase + addend;
  284                         val = ((Elf64_Addr (*)(void))addr)();
  285                         if (*where != val)
  286                                 *where = val;
  287                         break;
  288 
  289                 default:
  290                         printf("kldload: unexpected relocation type %ld\n",
  291                                rtype);
  292                         return (-1);
  293         }
  294         return (0);
  295 }
  296 
  297 int
  298 elf_reloc_ifunc(linker_file_t lf, Elf_Addr relocbase, const void *data,
  299     int type, elf_lookup_fn lookup)
  300 {
  301 
  302         return (elf_reloc_internal(lf, relocbase, data, type, lookup,
  303             ERI_ONLYIFUNC));
  304 }
  305 
  306 int
  307 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  308     elf_lookup_fn lookup)
  309 {
  310 
  311         return (elf_reloc_internal(lf, relocbase, data, type, lookup, 0));
  312 }
  313 
  314 int
  315 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  316     int type, elf_lookup_fn lookup)
  317 {
  318 
  319         return (elf_reloc_internal(lf, relocbase, data, type, lookup,
  320             ERI_LOCAL));
  321 }
  322 
  323 int
  324 elf_cpu_load_file(linker_file_t lf __unused)
  325 {
  326 
  327         return (0);
  328 }
  329 
  330 int
  331 elf_cpu_unload_file(linker_file_t lf __unused)
  332 {
  333 
  334         return (0);
  335 }

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