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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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