123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233 |
- /* 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.
- */
- #include "ldso.h"
- 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:
- {
- _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++;
- }
- }
- }
|