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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];
- ElfW(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 = ((ElfW(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(symname,
- &_dl_loaded_modules->symbol_scope, tpnt,
- ELF_RTYPE_CLASS_PLT, NULL);
- 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 r_scope_elem *scope,
- unsigned long rel_addr, unsigned long rel_size,
- int (*reloc_func)(struct elf_resolve *tpnt, struct r_scope_elem *scope,
- ElfW(Rela) *rpnt, ElfW(Sym) *symtab, char *strtab))
- {
- ElfW(Sym) *symtab;
- ElfW(Rela) *rpnt;
- char *strtab;
- int i;
- rpnt = (ElfW(Rela) *)rel_addr;
- rel_size /= sizeof(ElfW(Rela));
- symtab = (ElfW(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 = ELF_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 = ELF_R_TYPE(rpnt->r_info);
- _dl_dprintf(2, "can't handle reloc type %x\n",
- reloc_type);
- _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 r_scope_elem *scope,
- ElfW(Rela) *rpnt, ElfW(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
- struct symbol_ref sym_ref;
- reloc_addr = (unsigned long *)(tpnt->loadaddr + rpnt->r_offset);
- reloc_type = ELF_R_TYPE(rpnt->r_info);
- symtab_index = ELF_R_SYM(rpnt->r_info);
- symbol_addr = 0;
- sym_ref.sym = &symtab[symtab_index];
- sym_ref.tpnt = NULL;
- symname = strtab + symtab[symtab_index].st_name;
- if (symtab_index) {
- symbol_addr = (unsigned long)
- _dl_find_hash(symname, scope, tpnt,
- elf_machine_type_class(reloc_type), &sym_ref);
- /* Allow undefined references to weak symbols */
- if (!symbol_addr &&
- ELF_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 (_dl_trace_prelink) {
- _dl_debug_lookup (symname, tpnt, &symtab[symtab_index],
- &sym_ref, elf_machine_type_class(reloc_type));
- }
- }
- #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,
- struct r_scope_elem *scope,
- unsigned long rel_addr,
- unsigned long rel_size)
- {
- return _dl_parse(rpnt->dyn, scope, rel_addr, rel_size,
- _dl_do_reloc);
- }
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