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/mips/mips/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  *      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: releng/8.4/sys/mips/mips/elf_machdep.c 228295 2011-12-06 00:05:12Z gonzo $");
   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/proc.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/cache.h>
   51 
   52 #ifdef __mips_n64
   53 struct sysentvec elf64_freebsd_sysvec = {
   54         .sv_size        = SYS_MAXSYSCALL,
   55         .sv_table       = sysent,
   56         .sv_mask        = 0,
   57         .sv_sigsize     = 0,
   58         .sv_sigtbl      = NULL,
   59         .sv_errsize     = 0,
   60         .sv_errtbl      = NULL,
   61         .sv_transtrap   = NULL,
   62         .sv_fixup       = __elfN(freebsd_fixup),
   63         .sv_sendsig     = sendsig,
   64         .sv_sigcode     = sigcode,
   65         .sv_szsigcode   = &szsigcode,
   66         .sv_prepsyscall = NULL,
   67         .sv_name        = "FreeBSD ELF64",
   68         .sv_coredump    = __elfN(coredump),
   69         .sv_imgact_try  = NULL,
   70         .sv_minsigstksz = MINSIGSTKSZ,
   71         .sv_pagesize    = PAGE_SIZE,
   72         .sv_minuser     = VM_MIN_ADDRESS,
   73         .sv_maxuser     = VM_MAXUSER_ADDRESS,
   74         .sv_usrstack    = USRSTACK,
   75         .sv_psstrings   = PS_STRINGS,
   76         .sv_stackprot   = VM_PROT_ALL,
   77         .sv_copyout_strings = exec_copyout_strings,
   78         .sv_setregs     = exec_setregs,
   79         .sv_fixlimit    = NULL,
   80         .sv_maxssiz     = NULL,
   81         .sv_flags       = SV_ABI_FREEBSD | SV_LP64,
   82         .sv_schedtail   = NULL,
   83 };
   84 
   85 static Elf64_Brandinfo freebsd_brand_info = {
   86         .brand          = ELFOSABI_FREEBSD,
   87         .machine        = EM_MIPS,
   88         .compat_3_brand = "FreeBSD",
   89         .emul_path      = NULL,
   90         .interp_path    = "/libexec/ld-elf.so.1",
   91         .sysvec         = &elf64_freebsd_sysvec,
   92         .interp_newpath = NULL,
   93         .flags          = 0
   94 };
   95 
   96 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
   97     (sysinit_cfunc_t) elf64_insert_brand_entry,
   98     &freebsd_brand_info);
   99 
  100 void
  101 elf64_dump_thread(struct thread *td __unused, void *dst __unused,
  102     size_t *off __unused)
  103 {
  104 }
  105 #else
  106 struct sysentvec elf32_freebsd_sysvec = {
  107         .sv_size        = SYS_MAXSYSCALL,
  108         .sv_table       = sysent,
  109         .sv_mask        = 0,
  110         .sv_sigsize     = 0,
  111         .sv_sigtbl      = NULL,
  112         .sv_errsize     = 0,
  113         .sv_errtbl      = NULL,
  114         .sv_transtrap   = NULL,
  115         .sv_fixup       = __elfN(freebsd_fixup),
  116         .sv_sendsig     = sendsig,
  117         .sv_sigcode     = sigcode,
  118         .sv_szsigcode   = &szsigcode,
  119         .sv_prepsyscall = NULL,
  120         .sv_name        = "FreeBSD ELF32",
  121         .sv_coredump    = __elfN(coredump),
  122         .sv_imgact_try  = NULL,
  123         .sv_minsigstksz = MINSIGSTKSZ,
  124         .sv_pagesize    = PAGE_SIZE,
  125         .sv_minuser     = VM_MIN_ADDRESS,
  126         .sv_maxuser     = VM_MAXUSER_ADDRESS,
  127         .sv_usrstack    = USRSTACK,
  128         .sv_psstrings   = PS_STRINGS,
  129         .sv_stackprot   = VM_PROT_ALL,
  130         .sv_copyout_strings = exec_copyout_strings,
  131         .sv_setregs     = exec_setregs,
  132         .sv_fixlimit    = NULL,
  133         .sv_maxssiz     = NULL,
  134         .sv_flags       = SV_ABI_FREEBSD | SV_ILP32,
  135         .sv_set_syscall_retval = cpu_set_syscall_retval,
  136         .sv_fetch_syscall_args = NULL, /* XXXKIB */
  137         .sv_syscallnames = syscallnames,
  138         .sv_schedtail   = NULL,
  139 };
  140 
  141 static Elf32_Brandinfo freebsd_brand_info = {
  142         .brand          = ELFOSABI_FREEBSD,
  143         .machine        = EM_MIPS,
  144         .compat_3_brand = "FreeBSD",
  145         .emul_path      = NULL,
  146         .interp_path    = "/libexec/ld-elf.so.1",
  147         .sysvec         = &elf32_freebsd_sysvec,
  148         .interp_newpath = NULL,
  149         .flags          = 0
  150 };
  151 
  152 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
  153     (sysinit_cfunc_t) elf32_insert_brand_entry,
  154     &freebsd_brand_info);
  155 
  156 void
  157 elf32_dump_thread(struct thread *td __unused, void *dst __unused,
  158     size_t *off __unused)
  159 {
  160 }
  161 #endif
  162 
  163 /* Process one elf relocation with addend. */
  164 static int
  165 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
  166     int type, int local, elf_lookup_fn lookup)
  167 {
  168         Elf_Addr *where = (Elf_Addr *)NULL;
  169         Elf_Addr addr;
  170         Elf_Addr addend = (Elf_Addr)0;
  171         Elf_Word rtype = (Elf_Word)0, symidx;
  172         const Elf_Rel *rel;
  173 
  174         /*
  175          * Stash R_MIPS_HI16 info so we can use it when processing R_MIPS_LO16
  176          */
  177         static Elf_Addr ahl;
  178         static Elf_Addr *where_hi16;
  179 
  180         switch (type) {
  181         case ELF_RELOC_REL:
  182                 rel = (const Elf_Rel *)data;
  183                 where = (Elf_Addr *) (relocbase + rel->r_offset);
  184                 addend = *where;
  185                 rtype = ELF_R_TYPE(rel->r_info);
  186                 symidx = ELF_R_SYM(rel->r_info);
  187                 break;
  188         default:
  189                 panic("unknown reloc type %d\n", type);
  190         }
  191 
  192         switch (rtype) {
  193         case R_MIPS_NONE:       /* none */
  194                 break;
  195 
  196         case R_MIPS_32:         /* S + A */
  197                 addr = lookup(lf, symidx, 1);
  198                 if (addr == 0)
  199                         return (-1);
  200                 addr += addend;
  201                 if (*where != addr)
  202                         *where = addr;
  203                 break;
  204 
  205         case R_MIPS_26:         /* ((A << 2) | (P & 0xf0000000) + S) >> 2 */
  206                 addr = lookup(lf, symidx, 1);
  207                 if (addr == 0)
  208                         return (-1);
  209 
  210                 addend &= 0x03ffffff;
  211                 addend <<= 2;
  212 
  213                 addr += ((Elf_Addr)where & 0xf0000000) | addend;
  214                 addr >>= 2;
  215 
  216                 *where &= ~0x03ffffff;
  217                 *where |= addr & 0x03ffffff;
  218                 break;
  219 
  220         case R_MIPS_HI16:       /* ((AHL + S) - ((short)(AHL + S)) >> 16 */
  221                 ahl = addend << 16;
  222                 where_hi16 = where;
  223                 break;
  224 
  225         case R_MIPS_LO16:       /* AHL + S */
  226                 ahl += (int16_t)addend;
  227                 addr = lookup(lf, symidx, 1);
  228                 if (addr == 0)
  229                         return (-1);
  230 
  231                 addend &= 0xffff0000;
  232                 addend |= (uint16_t)(ahl + addr);
  233                 *where = addend;
  234 
  235                 addend = *where_hi16;
  236                 addend &= 0xffff0000;
  237                 addend |= ((ahl + addr) - (int16_t)(ahl + addr)) >> 16;
  238                 *where_hi16 = addend;
  239                 break;
  240 
  241         default:
  242                 printf("kldload: unexpected relocation type %d\n",
  243                         rtype);
  244                 return (-1);
  245         }
  246         return(0);
  247 }
  248 
  249 int
  250 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
  251     elf_lookup_fn lookup)
  252 {
  253 
  254         return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
  255 }
  256 
  257 int
  258 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
  259     int type, elf_lookup_fn lookup)
  260 {
  261 
  262         return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
  263 }
  264 
  265 int
  266 elf_cpu_load_file(linker_file_t lf __unused)
  267 {
  268 
  269         /*
  270          * Sync the I and D caches to make sure our relocations are visible.
  271          */
  272         mips_icache_sync_all();
  273 
  274         return (0);
  275 }
  276 
  277 int
  278 elf_cpu_unload_file(linker_file_t lf __unused)
  279 {
  280 
  281         return (0);
  282 }

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