sys/mips/mips/elf_machdep.c

   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  *      from: src/sys/i386/i386/elf_machdep.c,v 1.20 2004/08/11 02:35:05 marcel
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  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/sysent.h>
  38 #include <sys/imgact_elf.h>
  39 #include <sys/syscall.h>
  40 #include <sys/signalvar.h>
  41 #include <sys/vnode.h>
  42
  43 #include <vm/vm.h>
  44 #include <vm/pmap.h>
  45 #include <vm/vm_param.h>
  46
  47 #include <machine/elf.h>
  48 #include <machine/md_var.h>
  49
  50 struct sysentvec elf32_freebsd_sysvec = {
  51         SYS_MAXSYSCALL,
  52         sysent,
  53         0,
  54         0,
  55         NULL,
  56         0,
  57         NULL,
  58         NULL,
  59         __elfN(freebsd_fixup),
  60         sendsig,
  61         sigcode,
  62         &szsigcode,
  63         NULL,
  64         "FreeBSD ELF32",
  65         __elfN(coredump),
  66         NULL,
  67         MINSIGSTKSZ,
  68         PAGE_SIZE,
  69         VM_MIN_ADDRESS,
  70         VM_MAXUSER_ADDRESS,
  71         USRSTACK,
  72         PS_STRINGS,
  73         VM_PROT_ALL,
  74         exec_copyout_strings,
  75         exec_setregs,
  76         NULL
  77 };
  78
  79 static Elf32_Brandinfo freebsd_brand_info = {
  80                                                 ELFOSABI_FREEBSD,
  81                                                 EM_MIPS,
  82                                                 "FreeBSD",
  83                                                 NULL,
  84                                                 "/libexec/ld-elf.so.1",
  85                                                 &elf32_freebsd_sysvec,
  86                                                 NULL,
  87                                           };
  88
  89 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_ANY,
  90         (sysinit_cfunc_t) elf32_insert_brand_entry,
  91         &freebsd_brand_info);
  92
  93 static Elf32_Brandinfo freebsd_brand_oinfo = {
  94                                                 ELFOSABI_FREEBSD,
  95                                                 EM_MIPS,
  96                                                 "FreeBSD",
  97                                                 NULL,
  98                                                 "/usr/libexec/ld-elf.so.1",
  99                                                 &elf32_freebsd_sysvec,
 100                                                 NULL,
 101                                           };
 102
 103 SYSINIT(oelf32, SI_SUB_EXEC, SI_ORDER_ANY,
 104         (sysinit_cfunc_t) elf32_insert_brand_entry,
 105         &freebsd_brand_oinfo);
 106
 107
 108 void
 109 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
 110     size_t *off __unused)
 111 {
 112 }
 113
 114 /* Process one elf relocation with addend. */
 115 static int
 116 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
 117     int type, int local, elf_lookup_fn lookup)
 118 {
 119         Elf_Addr *where = (Elf_Addr *)NULL;;
 120         Elf_Addr addr;
 121         Elf_Addr addend = (Elf_Addr)0;
 122         Elf_Word rtype = (Elf_Word)0, symidx;
 123         const Elf_Rel *rel;
 124         const Elf_Rela *rela;
 125
 126         switch (type) {
 127         case ELF_RELOC_REL:
 128                 rel = (const Elf_Rel *)data;
 129                 where = (Elf_Addr *) (relocbase + rel->r_offset);
 130                 addend = *where;
 131                 rtype = ELF_R_TYPE(rel->r_info);
 132                 symidx = ELF_R_SYM(rel->r_info);
 133                 break;
 134         case ELF_RELOC_RELA:
 135                 rela = (const Elf_Rela *)data;
 136                 where = (Elf_Addr *) (relocbase + rela->r_offset);
 137                 addend = rela->r_addend;
 138                 rtype = ELF_R_TYPE(rela->r_info);
 139                 symidx = ELF_R_SYM(rela->r_info);
 140                 break;
 141         default:
 142                 panic("unknown reloc type %d\n", type);
 143         }
 144
 145         if (local) {
 146 #if 0 /* TBD  */
 147                 if (rtype == R_386_RELATIVE) {  /* A + B */
 148                         addr = relocbase + addend;
 149                         if (*where != addr)
 150                                 *where = addr;
 151                 }
 152                 return (0);
 153 #endif
 154         }
 155
 156         switch (rtype) {
 157
 158                 case R_MIPS_NONE:       /* none */
 159                         break;
 160
 161                 case R_MIPS_16:     /* S + sign-extend(A) */
 162                         /*
 163                          * There shouldn't be R_MIPS_16 relocs in kernel objects.
 164                          */
 165                         printf("kldload: unexpected R_MIPS_16 relocation\n");
 166                         return -1;
 167                         break;
 168
 169                 case R_MIPS_32: /* S + A - P */
 170                         addr = lookup(lf, symidx, 1);
 171                         if (addr == 0)
 172                                 return -1;
 173                         addr += addend;
 174                         if (*where != addr)
 175                                 *where = addr;
 176                         break;
 177
 178                 case R_MIPS_REL32:              /* A - EA + S */
 179                         /*
 180                          * There shouldn't be R_MIPS_REL32 relocs in kernel objects?
 181                          */
 182                         printf("kldload: unexpected R_MIPS_REL32 relocation\n");
 183                         return -1;
 184                         break;
 185
 186                 case R_MIPS_26:      /* ((A << 2) | (P & 0xf0000000) + S) >> 2 */
 187                         break;
 188
 189                 case R_MIPS_HI16:
 190                         /* extern/local: ((AHL + S) - ((short)(AHL + S)) >> 16 */
 191                         /* _gp_disp: ((AHL + GP - P) - (short)(AHL + GP - P)) >> 16 */
 192                         break;
 193
 194                 case R_MIPS_LO16:
 195                         /* extern/local: AHL + S */
 196                         /* _gp_disp: AHL + GP - P + 4 */
 197                         break;
 198
 199                 case R_MIPS_GPREL16:
 200                         /* extern/local: ((AHL + S) - ((short)(AHL + S)) >> 16 */
 201                         /* _gp_disp: ((AHL + GP - P) - (short)(AHL + GP - P)) >> 16 */
 202                         break;
 203
 204                 case R_MIPS_LITERAL: /* sign-extend(A) + L */
 205                         break;
 206
 207                 case R_MIPS_GOT16: /* external: G */
 208                         /* local: tbd */
 209                         break;
 210
 211                 case R_MIPS_PC16: /* sign-extend(A) + S - P */
 212                         break;
 213
 214                 case R_MIPS_CALL16: /* G */
 215                         break;
 216
 217                 case R_MIPS_GPREL32: /* A + S + GP0 - GP */
 218                         break;
 219
 220                 case R_MIPS_GOTHI16: /* (G - (short)G) >> 16 + A */
 221                         break;
 222
 223                 case R_MIPS_GOTLO16: /* G & 0xffff */
 224                         break;
 225
 226                 case R_MIPS_CALLHI16: /* (G - (short)G) >> 16 + A */
 227                         break;
 228
 229                 case R_MIPS_CALLLO16: /* G & 0xffff */
 230                         break;
 231
 232                 default:
 233                         printf("kldload: unexpected relocation type %d\n",
 234                             rtype);
 235                         return (-1);
 236         }
 237         return(0);
 238 }
 239
 240 int
 241 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
 242     elf_lookup_fn lookup)
 243 {
 244
 245         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
 246 }
 247
 248 int
 249 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
 250     int type, elf_lookup_fn lookup)
 251 {
 252
 253         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
 254 }
 255
 256 int
 257 elf_cpu_load_file(linker_file_t lf __unused)
 258 {
 259
 260         return (0);
 261 }
 262
 263 int
 264 elf_cpu_unload_file(linker_file_t lf __unused)
 265 {
 266
 267         return (0);
 268 }