elf_machdep.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    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("$FreeBSD$");
   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/sysent.h>
   36 #include <sys/imgact_elf.h>
   37 #include <sys/proc.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/md_var.h>
   48 
   49 struct sysentvec elf32_freebsd_sysvec = {
   50         .sv_size        = SYS_MAXSYSCALL,
   51         .sv_table       = sysent,
   52         .sv_mask        = 0,
   53         .sv_sigsize     = 0,
   54         .sv_sigtbl      = NULL,
   55         .sv_errsize     = 0,
   56         .sv_errtbl      = NULL,
   57         .sv_transtrap   = NULL,
   58         .sv_fixup       = __elfN(freebsd_fixup),
   59         .sv_sendsig     = sendsig,
   60         .sv_sigcode     = sigcode,
   61         .sv_szsigcode   = &szsigcode,
   62         .sv_prepsyscall = NULL,
   63         .sv_name        = "FreeBSD ELF32",
   64         .sv_coredump    = __elfN(coredump),
   65         .sv_imgact_try  = NULL,
   66         .sv_minsigstksz = MINSIGSTKSZ,
   67         .sv_pagesize    = PAGE_SIZE,
   68         .sv_minuser     = VM_MIN_ADDRESS,
   69         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   70         .sv_usrstack    = USRSTACK,
   71         .sv_psstrings   = PS_STRINGS,
   72         .sv_stackprot   = VM_PROT_ALL,
   73         .sv_copyout_strings = exec_copyout_strings,
   74         .sv_setregs     = exec_setregs,
   75         .sv_fixlimit    = NULL,
   76         .sv_maxssiz     = NULL,
   77         .sv_flags       = SV_ABI_FREEBSD | SV_ILP32,
   78         .sv_set_syscall_retval = cpu_set_syscall_retval,
   79         .sv_fetch_syscall_args = cpu_fetch_syscall_args,
   80         .sv_syscallnames = syscallnames,
   81         .sv_schedtail   = NULL,
   82         .sv_thread_detach = NULL,
   83         .sv_trap        = NULL,
   84 };
   85 
   86 static Elf32_Brandinfo freebsd_brand_info = {
   87         .brand          = ELFOSABI_FREEBSD,
   88         .machine        = EM_ARM,
   89         .compat_3_brand = "FreeBSD",
   90         .emul_path      = NULL,
   91         .interp_path    = "/libexec/ld-elf.so.1",
   92         .sysvec         = &elf32_freebsd_sysvec,
   93         .interp_newpath = NULL,
   94         .brand_note     = &elf32_freebsd_brandnote,
   95         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
   96 };
   97 
   98 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
   99         (sysinit_cfunc_t) elf32_insert_brand_entry,
  100         &freebsd_brand_info);
  101 
  102 static Elf32_Brandinfo freebsd_brand_oinfo = {
  103         .brand          = ELFOSABI_FREEBSD,
  104         .machine        = EM_ARM,
  105         .compat_3_brand = "FreeBSD",
  106         .emul_path      = NULL,
  107         .interp_path    = "/usr/libexec/ld-elf.so.1",
  108         .sysvec         = &elf32_freebsd_sysvec,
  109         .interp_newpath = NULL,
  110         .brand_note     = &elf32_freebsd_brandnote,
  111         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  112 };
  113 
  114 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
  115         (sysinit_cfunc_t) elf32_insert_brand_entry,
  116         &freebsd_brand_oinfo);
  117 
  118 
  119 void
  120 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  121     size_t *off __unused)
  122 {
  123 }
  124 
  125 
  126 /* Process one elf relocation with addend. */
  127 static int
  128 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  129     int type, int local, elf_lookup_fn lookup)
  130 {
  131         Elf_Addr *where;
  132         Elf_Addr addr;
  133         Elf_Addr addend;
  134         Elf_Word rtype, symidx;
  135         const Elf_Rel *rel;
  136         const Elf_Rela *rela;
  137         int error;
  138 
  139         switch (type) {
  140         case ELF_RELOC_REL:
  141                 rel = (const Elf_Rel *)data;
  142                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  143                 addend = *where;
  144                 rtype = ELF_R_TYPE(rel->r_info);
  145                 symidx = ELF_R_SYM(rel->r_info);
  146                 break;
  147         case ELF_RELOC_RELA:
  148                 rela = (const Elf_Rela *)data;
  149                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  150                 addend = rela->r_addend;
  151                 rtype = ELF_R_TYPE(rela->r_info);
  152                 symidx = ELF_R_SYM(rela->r_info);
  153                 break;
  154         default:
  155                 panic("unknown reloc type %d\n", type);
  156         }
  157 
  158         if (local) {
  159                 if (rtype == R_ARM_RELATIVE) {  /* A + B */
  160                         addr = elf_relocaddr(lf, relocbase + addend);
  161                         if (*where != addr)
  162                                 *where = addr;
  163                 }
  164                 return (0);
  165         }
  166 
  167         switch (rtype) {
  168 
  169                 case R_ARM_NONE:        /* none */
  170                         break;
  171 
  172                 case R_ARM_ABS32:
  173                         error = lookup(lf, symidx, 1, &addr);
  174                         if (error != 0)
  175                                 return -1;
  176                         *where += addr;
  177                         break;
  178 
  179                 case R_ARM_COPY:        /* none */
  180                         /*
  181                          * There shouldn't be copy relocations in kernel
  182                          * objects.
  183                          */
  184                         printf("kldload: unexpected R_COPY relocation\n");
  185                         return -1;
  186                         break;
  187 
  188                 case R_ARM_JUMP_SLOT:
  189                         error = lookup(lf, symidx, 1, &addr);
  190                         if (error == 0) {
  191                                 *where = addr;
  192                                 return (0);
  193                         }
  194                         return (-1);
  195                 case R_ARM_RELATIVE:
  196                         break;
  197 
  198                 default:
  199                         printf("kldload: unexpected relocation type %d\n",
  200                                rtype);
  201                         return -1;
  202         }
  203         return(0);
  204 }
  205 
  206 int
  207 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  208     elf_lookup_fn lookup)
  209 {
  210 
  211         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  212 }
  213 
  214 int
  215 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  216     int type, elf_lookup_fn lookup)
  217 {
  218 
  219         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  220 }
  221 
  222 int
  223 elf_cpu_load_file(linker_file_t lf __unused)
  224 {
  225 
  226         /*
  227          * The pmap code does not do an icache sync upon establishing executable
  228          * mappings in the kernel pmap.  It's an optimization based on the fact
  229          * that kernel memory allocations always have EXECUTABLE protection even
  230          * when the memory isn't going to hold executable code.  The only time
  231          * kernel memory holding instructions does need a sync is after loading
  232          * a kernel module, and that's when this function gets called.  Normal
  233          * data cache maintenance has already been done by the IO code, and TLB
  234          * maintenance has been done by the pmap code, so all we have to do here
  235          * is invalidate the instruction cache (which also invalidates the
  236          * branch predictor cache on platforms that have one).
  237          */
  238         cpu_icache_sync_all();
  239         return (0);
  240 }
  241 
  242 int
  243 elf_cpu_unload_file(linker_file_t lf __unused)
  244 {
  245 
  246         return (0);
  247 }

Cache object: 20d8936878d1362f71a819467a1353ce

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

FreeBSD/Linux Kernel Cross Reference sys/arm/arm/elf_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/arm/elf_machdep.c