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path: root/ldso/ldso/avr32/elfinterp.c
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/*
 * AVR32 ELF shared library loader suppport
 *
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. The name of the above contributors may not be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

unsigned long _dl_linux_resolver(unsigned long got_offset, unsigned long *got)
{
       /*
        * AVR32 currently does not do lazy relocation.
        */
#if 0
       struct elf_resolve *tpnt = (struct elf_resolve *)got[1];
       Elf32_Sym *sym;
       unsigned long local_gotno;
       unsigned long gotsym;
       unsigned long new_addr;
       char *strtab, *symname;
       unsigned long *entry;
       unsigned long sym_index = got_offset / 4;

       local_gotno = tpnt->dynamic_info[DT_AVR32_LOCAL_GOTNO];
       gotsym = tpnt->dynamic_info[DT_AVR32_GOTSYM];

       sym = ((Elf32_Sym *)(tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr))
               + sym_index;
       strtab = (char *)(tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
       symname = strtab + sym->st_name;

       new_addr = (unsigned long) _dl_find_hash(strtab + sym->st_name,
                                                tpnt->symbol_scope, tpnt,
                                                resolver);

       entry = (unsigned long *)(got + local_gotno + sym_index - gotsym);
       *entry = new_addr;

       return new_addr;
#endif
       return 0;
}

static int
_dl_parse(struct elf_resolve *tpnt, struct dyn_elf *scope,
         unsigned long rel_addr, unsigned long rel_size,
         int (*reloc_func)(struct elf_resolve *tpnt, struct dyn_elf *scope,
                           Elf32_Rela *rpnt, Elf32_Sym *symtab, char *strtab))
{
       Elf32_Sym *symtab;
       Elf32_Rela *rpnt;
       char *strtab;
       int i;

       rpnt = (Elf32_Rela *)rel_addr;
       rel_size /= sizeof(Elf32_Rela);
       symtab = (Elf32_Sym *)tpnt->dynamic_info[DT_SYMTAB];
       strtab = (char *)tpnt->dynamic_info[DT_STRTAB];

       for (i = 0; i < rel_size; i++, rpnt++) {
               int symtab_index, res;

               symtab_index = ELF32_R_SYM(rpnt->r_info);

               debug_sym(symtab, strtab, symtab_index);
               debug_reloc(symtab, strtab, rpnt);

               res = reloc_func(tpnt, scope, rpnt, symtab, strtab);

               if (res == 0)
                       continue;

               _dl_dprintf(2, "\n%s: ", _dl_progname);

               if (symtab_index)
                       _dl_dprintf(2, "symbol '%s': ",
                                   strtab + symtab[symtab_index].st_name);

               if (res < 0) {
                       int reloc_type = ELF32_R_TYPE(rpnt->r_info);
#if defined(__SUPPORT_LD_DEBUG__)
                       _dl_dprintf(2, "can't handle reloc type %s\n",
                                   _dl_reltypes(reloc_type));
#else
                       _dl_dprintf(2, "can't handle reloc type %x\n",
                                   reloc_type);
#endif
                       _dl_exit(-res);
               } else {
                       _dl_dprintf(2, "can't resolve symbol\n");
                       return res;
               }
       }

       return 0;
}

static int _dl_do_reloc(struct elf_resolve *tpnt, struct dyn_elf *scope,
                       Elf32_Rela *rpnt, Elf32_Sym *symtab, char *strtab)
{
       int reloc_type;
       int symtab_index;
       char *symname;
       unsigned long *reloc_addr;
       unsigned long symbol_addr;
#if defined(__SUPPORT_LD_DEBUG__)
       unsigned long old_val;
#endif

       reloc_addr = (unsigned long *)(tpnt->loadaddr + rpnt->r_offset);
       reloc_type = ELF32_R_TYPE(rpnt->r_info);
       symtab_index = ELF32_R_SYM(rpnt->r_info);
       symbol_addr = 0;
       symname = strtab + symtab[symtab_index].st_name;

       if (symtab_index) {
               symbol_addr = (unsigned long)
                       _dl_find_hash(strtab + symtab[symtab_index].st_name,
                                     tpnt->symbol_scope, tpnt,
                                     elf_machine_type_class(reloc_type));

               /* Allow undefined references to weak symbols */
               if (!symbol_addr &&
                   ELF32_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK) {
                       _dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
                                   _dl_progname, symname);
                       return 0;
               }
       }

#if defined(__SUPPORT_LD_DEBUG__)
       old_val = *reloc_addr;
#endif
       switch (reloc_type) {
       case R_AVR32_NONE:
               break;
       case R_AVR32_GLOB_DAT:
       case R_AVR32_JMP_SLOT:
               *reloc_addr = symbol_addr + rpnt->r_addend;
               break;
       case R_AVR32_RELATIVE:
               *reloc_addr = (unsigned long)tpnt->loadaddr
                       + rpnt->r_addend;
               break;
       default:
               return -1;
       }

#if defined(__SUPPORT_LD_DEBUG__)
       if (_dl_debug_reloc && _dl_debug_detail)
               _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n",
                           old_val, *reloc_addr);
#endif

       return 0;
}

void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
                                          unsigned long rel_addr,
                                          unsigned long rel_size)
{
       /* TODO: Might want to support this in order to get faster
        * startup times... */
}

int _dl_parse_relocation_information(struct dyn_elf *rpnt,
                                    unsigned long rel_addr,
                                    unsigned long rel_size)
{
       return _dl_parse(rpnt->dyn, rpnt->dyn->symbol_scope, rel_addr, rel_size,
                        _dl_do_reloc);
}