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/i386/i386/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/10.3/sys/i386/i386/elf_machdep.c 294136 2016-01-16 07:56:49Z dchagin $");
   28 
   29 #include "opt_cpu.h"
   30 
   31 #include <sys/param.h>
   32 #include <sys/kernel.h>
   33 #include <sys/systm.h>
   34 #include <sys/exec.h>
   35 #include <sys/imgact.h>
   36 #include <sys/linker.h>
   37 #include <sys/proc.h>
   38 #include <sys/sysent.h>
   39 #include <sys/imgact_elf.h>
   40 #include <sys/syscall.h>
   41 #include <sys/signalvar.h>
   42 #include <sys/vnode.h>
   43 
   44 #include <vm/vm.h>
   45 #include <vm/pmap.h>
   46 #include <vm/vm_param.h>
   47 
   48 #include <machine/elf.h>
   49 #include <machine/md_var.h>
   50 #include <machine/npx.h>
   51 
   52 #if !defined(CPU_DISABLE_SSE) && defined(I686_CPU)
   53 #define CPU_ENABLE_SSE
   54 #endif
   55 
   56 struct sysentvec elf32_freebsd_sysvec = {
   57         .sv_size        = SYS_MAXSYSCALL,
   58         .sv_table       = sysent,
   59         .sv_mask        = 0,
   60         .sv_sigsize     = 0,
   61         .sv_sigtbl      = NULL,
   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_prepsyscall = NULL,
   70         .sv_name        = "FreeBSD ELF32",
   71         .sv_coredump    = __elfN(coredump),
   72         .sv_imgact_try  = NULL,
   73         .sv_minsigstksz = MINSIGSTKSZ,
   74         .sv_pagesize    = PAGE_SIZE,
   75         .sv_minuser     = VM_MIN_ADDRESS,
   76         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   77         .sv_usrstack    = USRSTACK,
   78         .sv_psstrings   = PS_STRINGS,
   79         .sv_stackprot   = VM_PROT_ALL,
   80         .sv_copyout_strings     = exec_copyout_strings,
   81         .sv_setregs     = exec_setregs,
   82         .sv_fixlimit    = NULL,
   83         .sv_maxssiz     = NULL,
   84         .sv_flags       = SV_ABI_FREEBSD | SV_IA32 | SV_ILP32 | SV_SHP,
   85         .sv_set_syscall_retval = cpu_set_syscall_retval,
   86         .sv_fetch_syscall_args = cpu_fetch_syscall_args,
   87         .sv_syscallnames = syscallnames,
   88         .sv_shared_page_base = SHAREDPAGE,
   89         .sv_shared_page_len = PAGE_SIZE,
   90         .sv_schedtail   = NULL,
   91         .sv_thread_detach = NULL,
   92         .sv_trap        = NULL,
   93 };
   94 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
   95 
   96 static Elf32_Brandinfo freebsd_brand_info = {
   97         .brand          = ELFOSABI_FREEBSD,
   98         .machine        = EM_386,
   99         .compat_3_brand = "FreeBSD",
  100         .emul_path      = NULL,
  101         .interp_path    = "/libexec/ld-elf.so.1",
  102         .sysvec         = &elf32_freebsd_sysvec,
  103         .interp_newpath = NULL,
  104         .brand_note     = &elf32_freebsd_brandnote,
  105         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  106 };
  107 
  108 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
  109         (sysinit_cfunc_t) elf32_insert_brand_entry,
  110         &freebsd_brand_info);
  111 
  112 static Elf32_Brandinfo freebsd_brand_oinfo = {
  113         .brand          = ELFOSABI_FREEBSD,
  114         .machine        = EM_386,
  115         .compat_3_brand = "FreeBSD",
  116         .emul_path      = NULL,
  117         .interp_path    = "/usr/libexec/ld-elf.so.1",
  118         .sysvec         = &elf32_freebsd_sysvec,
  119         .interp_newpath = NULL,
  120         .brand_note     = &elf32_freebsd_brandnote,
  121         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  122 };
  123 
  124 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  125         (sysinit_cfunc_t) elf32_insert_brand_entry,
  126         &freebsd_brand_oinfo);
  127 
  128 static Elf32_Brandinfo kfreebsd_brand_info = {
  129         .brand          = ELFOSABI_FREEBSD,
  130         .machine        = EM_386,
  131         .compat_3_brand = "FreeBSD",
  132         .emul_path      = NULL,
  133         .interp_path    = "/lib/ld.so.1",
  134         .sysvec         = &elf32_freebsd_sysvec,
  135         .interp_newpath = NULL,
  136         .brand_note     = &elf32_kfreebsd_brandnote,
  137         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
  138 };
  139 
  140 SYSINIT(kelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  141         (sysinit_cfunc_t) elf32_insert_brand_entry,
  142         &kfreebsd_brand_info);
  143 
  144 
  145 void
  146 elf32_dump_thread(struct thread *td, void *dst, size_t *off)
  147 {
  148 #ifdef CPU_ENABLE_SSE
  149         void *buf;
  150 #endif
  151         size_t len;
  152 
  153         len = 0;
  154 #ifdef CPU_ENABLE_SSE
  155         if (use_xsave) {
  156                 if (dst != NULL) {
  157                         npxgetregs(td);
  158                         len += elf32_populate_note(NT_X86_XSTATE,
  159                             get_pcb_user_save_td(td), dst,
  160                             cpu_max_ext_state_size, &buf);
  161                         *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
  162                             xsave_mask;
  163                 } else
  164                         len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL,
  165                             cpu_max_ext_state_size, NULL);
  166         }
  167 #endif
  168         *off = len;
  169 }
  170 
  171 /* Process one elf relocation with addend. */
  172 static int
  173 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  174     int type, int local, elf_lookup_fn lookup)
  175 {
  176         Elf_Addr *where;
  177         Elf_Addr addr;
  178         Elf_Addr addend;
  179         Elf_Word rtype, symidx;
  180         const Elf_Rel *rel;
  181         const Elf_Rela *rela;
  182         int error;
  183 
  184         switch (type) {
  185         case ELF_RELOC_REL:
  186                 rel = (const Elf_Rel *)data;
  187                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  188                 addend = *where;
  189                 rtype = ELF_R_TYPE(rel->r_info);
  190                 symidx = ELF_R_SYM(rel->r_info);
  191                 break;
  192         case ELF_RELOC_RELA:
  193                 rela = (const Elf_Rela *)data;
  194                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  195                 addend = rela->r_addend;
  196                 rtype = ELF_R_TYPE(rela->r_info);
  197                 symidx = ELF_R_SYM(rela->r_info);
  198                 break;
  199         default:
  200                 panic("unknown reloc type %d\n", type);
  201         }
  202 
  203         if (local) {
  204                 if (rtype == R_386_RELATIVE) {  /* A + B */
  205                         addr = elf_relocaddr(lf, relocbase + addend);
  206                         if (*where != addr)
  207                                 *where = addr;
  208                 }
  209                 return (0);
  210         }
  211 
  212         switch (rtype) {
  213 
  214                 case R_386_NONE:        /* none */
  215                         break;
  216 
  217                 case R_386_32:          /* S + A */
  218                         error = lookup(lf, symidx, 1, &addr);
  219                         if (error != 0)
  220                                 return -1;
  221                         addr += addend;
  222                         if (*where != addr)
  223                                 *where = addr;
  224                         break;
  225 
  226                 case R_386_PC32:        /* S + A - P */
  227                         error = lookup(lf, symidx, 1, &addr);
  228                         if (error != 0)
  229                                 return -1;
  230                         addr += addend - (Elf_Addr)where;
  231                         if (*where != addr)
  232                                 *where = addr;
  233                         break;
  234 
  235                 case R_386_COPY:        /* none */
  236                         /*
  237                          * There shouldn't be copy relocations in kernel
  238                          * objects.
  239                          */
  240                         printf("kldload: unexpected R_COPY relocation\n");
  241                         return -1;
  242                         break;
  243 
  244                 case R_386_GLOB_DAT:    /* S */
  245                         error = lookup(lf, symidx, 1, &addr);
  246                         if (error != 0)
  247                                 return -1;
  248                         if (*where != addr)
  249                                 *where = addr;
  250                         break;
  251 
  252                 case R_386_RELATIVE:
  253                         break;
  254 
  255                 default:
  256                         printf("kldload: unexpected relocation type %d\n",
  257                                rtype);
  258                         return -1;
  259         }
  260         return(0);
  261 }
  262 
  263 int
  264 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  265     elf_lookup_fn lookup)
  266 {
  267 
  268         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  269 }
  270 
  271 int
  272 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  273     int type, elf_lookup_fn lookup)
  274 {
  275 
  276         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  277 }
  278 
  279 int
  280 elf_cpu_load_file(linker_file_t lf __unused)
  281 {
  282 
  283         return (0);
  284 }
  285 
  286 int
  287 elf_cpu_unload_file(linker_file_t lf __unused)
  288 {
  289 
  290         return (0);
  291 }

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