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/powerpc/powerpc/elf64_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  * $FreeBSD: releng/10.1/sys/powerpc/powerpc/elf64_machdep.c 219405 2011-03-08 19:01:45Z dchagin $
   26  */
   27 
   28 #include <sys/param.h>
   29 #include <sys/kernel.h>
   30 #include <sys/systm.h>
   31 #include <sys/exec.h>
   32 #include <sys/imgact.h>
   33 #include <sys/malloc.h>
   34 #include <sys/proc.h>
   35 #include <sys/namei.h>
   36 #include <sys/fcntl.h>
   37 #include <sys/sysent.h>
   38 #include <sys/imgact_elf.h>
   39 #include <sys/syscall.h>
   40 #include <sys/signalvar.h>
   41 #include <sys/vnode.h>
   42 #include <sys/linker.h>
   43 
   44 #include <vm/vm.h>
   45 #include <vm/vm_param.h>
   46 
   47 #include <machine/cpu.h>
   48 #include <machine/elf.h>
   49 #include <machine/md_var.h>
   50 
   51 struct sysentvec elf64_freebsd_sysvec = {
   52         .sv_size        = SYS_MAXSYSCALL,
   53         .sv_table       = sysent,
   54         .sv_mask        = 0,
   55         .sv_sigsize     = 0,
   56         .sv_sigtbl      = NULL,
   57         .sv_errsize     = 0,
   58         .sv_errtbl      = NULL,
   59         .sv_transtrap   = NULL,
   60         .sv_fixup       = __elfN(freebsd_fixup),
   61         .sv_sendsig     = sendsig,
   62         .sv_sigcode     = sigcode64,
   63         .sv_szsigcode   = &szsigcode64,
   64         .sv_prepsyscall = NULL,
   65         .sv_name        = "FreeBSD ELF64",
   66         .sv_coredump    = __elfN(coredump),
   67         .sv_imgact_try  = NULL,
   68         .sv_minsigstksz = MINSIGSTKSZ,
   69         .sv_pagesize    = PAGE_SIZE,
   70         .sv_minuser     = VM_MIN_ADDRESS,
   71         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   72         .sv_usrstack    = USRSTACK,
   73         .sv_psstrings   = PS_STRINGS,
   74         .sv_stackprot   = VM_PROT_ALL,
   75         .sv_copyout_strings = exec_copyout_strings,
   76         .sv_setregs     = exec_setregs,
   77         .sv_fixlimit    = NULL,
   78         .sv_maxssiz     = NULL,
   79         .sv_flags       = SV_ABI_FREEBSD | SV_LP64 | SV_SHP,
   80         .sv_set_syscall_retval = cpu_set_syscall_retval,
   81         .sv_fetch_syscall_args = cpu_fetch_syscall_args,
   82         .sv_syscallnames = syscallnames,
   83         .sv_shared_page_base = SHAREDPAGE,
   84         .sv_shared_page_len = PAGE_SIZE,
   85         .sv_schedtail   = NULL,
   86 };
   87 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
   88 
   89 static Elf64_Brandinfo freebsd_brand_info = {
   90         .brand          = ELFOSABI_FREEBSD,
   91         .machine        = EM_PPC64,
   92         .compat_3_brand = "FreeBSD",
   93         .emul_path      = NULL,
   94         .interp_path    = "/libexec/ld-elf.so.1",
   95         .sysvec         = &elf64_freebsd_sysvec,
   96         .interp_newpath = NULL,
   97         .brand_note     = &elf64_freebsd_brandnote,
   98         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
   99 };
  100 
  101 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
  102     (sysinit_cfunc_t) elf64_insert_brand_entry,
  103     &freebsd_brand_info);
  104 
  105 static Elf64_Brandinfo freebsd_brand_oinfo = {
  106         .brand          = ELFOSABI_FREEBSD,
  107         .machine        = EM_PPC64,
  108         .compat_3_brand = "FreeBSD",
  109         .emul_path      = NULL,
  110         .interp_path    = "/usr/libexec/ld-elf.so.1",
  111         .sysvec         = &elf64_freebsd_sysvec,
  112         .interp_newpath = NULL,
  113         .brand_note     = &elf64_freebsd_brandnote,
  114         .flags          = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
  115 };
  116 
  117 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
  118         (sysinit_cfunc_t) elf64_insert_brand_entry,
  119         &freebsd_brand_oinfo);
  120 
  121 void
  122 elf64_dump_thread(struct thread *td __unused, void *dst __unused,
  123     size_t *off __unused)
  124 {
  125 }
  126 
  127 
  128 /* Process one elf relocation with addend. */
  129 static int
  130 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  131     int type, int local, elf_lookup_fn lookup)
  132 {
  133         Elf_Addr *where;
  134         Elf_Addr addr;
  135         Elf_Addr addend;
  136         Elf_Word rtype, symidx;
  137         const Elf_Rela *rela;
  138 
  139         switch (type) {
  140         case ELF_RELOC_REL:
  141                 panic("PPC only supports RELA relocations");
  142                 break;
  143         case ELF_RELOC_RELA:
  144                 rela = (const Elf_Rela *)data;
  145                 where = (Elf_Addr *) (relocbase + rela->r_offset);
  146                 addend = rela->r_addend;
  147                 rtype = ELF_R_TYPE(rela->r_info);
  148                 symidx = ELF_R_SYM(rela->r_info);
  149                 break;
  150         default:
  151                 panic("elf_reloc: unknown relocation mode %d\n", type);
  152         }
  153 
  154         switch (rtype) {
  155 
  156         case R_PPC_NONE:
  157                 break;
  158 
  159         case R_PPC64_ADDR64:    /* doubleword64 S + A */
  160                 addr = lookup(lf, symidx, 1);
  161                 if (addr == 0)
  162                         return -1;
  163                 addr += addend;
  164                 *where = addr;
  165                 break;
  166 
  167         case R_PPC_RELATIVE:    /* doubleword64 B + A */
  168                 *where = elf_relocaddr(lf, relocbase + addend);
  169                 break;
  170 
  171         case R_PPC_JMP_SLOT:    /* function descriptor copy */
  172                 addr = lookup(lf, symidx, 1);
  173                 memcpy(where, (Elf_Addr *)addr, 3*sizeof(Elf_Addr));
  174                 __asm __volatile("dcbst 0,%0; sync" :: "r"(where) : "memory");
  175                 break;
  176 
  177         default:
  178                 printf("kldload: unexpected relocation type %d\n",
  179                     (int) rtype);
  180                 return -1;
  181         }
  182         return(0);
  183 }
  184 
  185 int
  186 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  187     elf_lookup_fn lookup)
  188 {
  189 
  190         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  191 }
  192 
  193 int
  194 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  195     int type, elf_lookup_fn lookup)
  196 {
  197 
  198         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  199 }
  200 
  201 int
  202 elf_cpu_load_file(linker_file_t lf)
  203 {
  204         /* Only sync the cache for non-kernel modules */
  205         if (lf->id != 1)
  206                 __syncicache(lf->address, lf->size);
  207         return (0);
  208 }
  209 
  210 int
  211 elf_cpu_unload_file(linker_file_t lf __unused)
  212 {
  213 
  214         return (0);
  215 }

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