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/* vi: set sw=4 ts=4: */
/* mips/mipsel ELF shared library loader suppport
*
Copyright (C) 2002, Steven J. Hill (sjhill@realitydiluted.com)
*
* 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.
*/
extern int _dl_runtime_resolve(void);
#define OFFSET_GP_GOT 0x7ff0
unsigned long __dl_runtime_resolve(unsigned long sym_index,
unsigned long old_gpreg)
{
unsigned long *got = (unsigned long *) (old_gpreg - OFFSET_GP_GOT);
struct elf_resolve *tpnt = (struct elf_resolve *) got[1];
Elf32_Sym *sym;
char *strtab;
unsigned long local_gotno;
unsigned long gotsym;
unsigned long new_addr;
unsigned long instr_addr;
char **got_addr;
char *symname;
gotsym = tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX];
local_gotno = tpnt->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX];
sym = ((Elf32_Sym *) tpnt->dynamic_info[DT_SYMTAB]) + sym_index;
strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
symname = strtab + sym->st_name;
new_addr = (unsigned long) _dl_find_hash(symname,
tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT);
if (unlikely(!new_addr)) {
_dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
_dl_progname, symname);
_dl_exit (1);
}
/* Address of jump instruction to fix up */
instr_addr = (unsigned long) (got + local_gotno + sym_index - gotsym);
got_addr = (char **) instr_addr;
#if defined (__SUPPORT_LD_DEBUG__)
if (_dl_debug_bindings)
{
_dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
if(_dl_debug_detail) _dl_dprintf(_dl_debug_file,
"\n\tpatched %x ==> %x @ %x\n", *got_addr, new_addr, got_addr);
}
if (!_dl_debug_nofixups) {
*got_addr = (char*)new_addr;
}
#else
*got_addr = (char*)new_addr;
#endif
return new_addr;
}
void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
unsigned long rel_addr, unsigned long rel_size)
{
/* Nothing to do */
return;
}
int _dl_parse_relocation_information(struct dyn_elf *xpnt,
unsigned long rel_addr, unsigned long rel_size)
{
Elf32_Sym *symtab;
Elf32_Rel *rpnt;
char *strtab;
unsigned long i;
unsigned long *got;
unsigned long *reloc_addr=NULL;
unsigned long symbol_addr;
int reloc_type, symtab_index;
struct elf_resolve *tpnt = xpnt->dyn;
#if defined (__SUPPORT_LD_DEBUG__)
unsigned long old_val=0;
#endif
/* Now parse the relocation information */
rel_size = rel_size / sizeof(Elf32_Rel);
rpnt = (Elf32_Rel *) rel_addr;
symtab = (Elf32_Sym *) tpnt->dynamic_info[DT_SYMTAB];
strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
got = (unsigned long *) tpnt->dynamic_info[DT_PLTGOT];
for (i = 0; i < rel_size; i++, rpnt++) {
reloc_addr = (unsigned long *) (tpnt->loadaddr +
(unsigned long) rpnt->r_offset);
reloc_type = ELF32_R_TYPE(rpnt->r_info);
symtab_index = ELF32_R_SYM(rpnt->r_info);
symbol_addr = 0;
debug_sym(symtab,strtab,symtab_index);
debug_reloc(symtab,strtab,rpnt);
#if defined (__SUPPORT_LD_DEBUG__)
if (reloc_addr)
old_val = *reloc_addr;
#endif
switch (reloc_type) {
case R_MIPS_REL32:
if (symtab_index) {
if (symtab_index < tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX])
*reloc_addr +=
symtab[symtab_index].st_value +
(unsigned long) tpnt->loadaddr;
else {
*reloc_addr += got[symtab_index + tpnt->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX] -
tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX]];
}
}
else {
*reloc_addr += (unsigned long) tpnt->loadaddr;
}
break;
case R_MIPS_NONE:
break;
default:
{
int reloc_type = ELF32_R_TYPE(rpnt->r_info);
_dl_dprintf(2, "\n%s: ",_dl_progname);
if (symtab_index)
_dl_dprintf(2, "symbol '%s': ", strtab + symtab[symtab_index].st_name);
#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(1);
}
};
};
#if defined (__SUPPORT_LD_DEBUG__)
if(_dl_debug_reloc && _dl_debug_detail && reloc_addr)
_dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n", old_val, *reloc_addr, reloc_addr);
#endif
return 0;
}
/* Relocate the global GOT entries for the object */
void _dl_perform_mips_global_got_relocations(struct elf_resolve *tpnt, int lazy)
{
Elf32_Sym *sym;
char *strtab;
unsigned long i, tmp_lazy;
unsigned long *got_entry;
for (; tpnt ; tpnt = tpnt->next) {
/* We don't touch the dynamic linker */
if (tpnt->libtype == program_interpreter)
continue;
/* Setup the loop variables */
got_entry = (unsigned long *) (tpnt->dynamic_info[DT_PLTGOT])
+ tpnt->dynamic_info[DT_MIPS_LOCAL_GOTNO_IDX];
sym = (Elf32_Sym *) tpnt->dynamic_info[DT_SYMTAB] + tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX];
strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
i = tpnt->dynamic_info[DT_MIPS_SYMTABNO_IDX] - tpnt->dynamic_info[DT_MIPS_GOTSYM_IDX];
#if defined (__SUPPORT_LD_DEBUG__)
if(_dl_debug_reloc)
_dl_dprintf(2, "_dl_perform_mips_global_got_relocations for '%s'\n", tpnt->libname);
#endif
tmp_lazy = lazy && !tpnt->dynamic_info[DT_BIND_NOW];
/* Relocate the global GOT entries for the object */
while(i--) {
if (sym->st_shndx == SHN_UNDEF) {
if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC && sym->st_value && tmp_lazy) {
*got_entry = sym->st_value + (unsigned long) tpnt->loadaddr;
}
else {
*got_entry = (unsigned long) _dl_find_hash(strtab +
sym->st_name, tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT);
}
}
else if (sym->st_shndx == SHN_COMMON) {
*got_entry = (unsigned long) _dl_find_hash(strtab +
sym->st_name, tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT);
}
else if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC &&
*got_entry != sym->st_value && tmp_lazy) {
*got_entry += (unsigned long) tpnt->loadaddr;
}
else if (ELF32_ST_TYPE(sym->st_info) == STT_SECTION) {
if (sym->st_other == 0)
*got_entry += (unsigned long) tpnt->loadaddr;
}
else {
*got_entry = (unsigned long) _dl_find_hash(strtab +
sym->st_name, tpnt->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT);
}
got_entry++;
sym++;
}
}
}
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