123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207 |
- /* 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_linux_resolve(void);
- #define OFFSET_GP_GOT 0x7ff0
- unsigned long _dl_linux_resolver(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 value;
- gotsym = tpnt->mips_gotsym;
- local_gotno = tpnt->mips_local_gotno;
- sym = ((Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr)) +
- sym_index;
- strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
- value = (unsigned long) _dl_find_hash(strtab + sym->st_name,
- tpnt->symbol_scope, tpnt, resolver);
- *(got + local_gotno + sym_index - gotsym) = value;
- #if defined (__SUPPORT_LD_DEBUG__)
- _dl_dprintf(2, "---RESOLVER---\n");
- _dl_dprintf(2, "SYMTAB INDEX: %i\n", sym_index);
- _dl_dprintf(2, " GOTSYM: %i\n", gotsym);
- _dl_dprintf(2, " LOCAL GOTNO: %i\n", local_gotno);
- _dl_dprintf(2, " VALUE: %x\n", value);
- _dl_dprintf(2, " SYMBOL: %s\n\n", strtab + sym->st_name);
- #endif
- return value;
- }
- void _dl_parse_lazy_relocation_information(struct elf_resolve *tpnt,
- unsigned long rel_addr, unsigned long rel_size, int type)
- {
- /* Nothing to do */
- return;
- }
- int _dl_parse_copy_information(struct dyn_elf *xpnt, unsigned long rel_addr,
- unsigned long rel_size, int type)
- {
- /* Nothing to do */
- return 0;
- }
-
- int _dl_parse_relocation_information(struct elf_resolve *tpnt,
- unsigned long rel_addr, unsigned long rel_size, int type)
- {
- Elf32_Sym *symtab;
- Elf32_Rel *rpnt;
- char *strtab;
- unsigned long *got;
- unsigned long *reloc_addr;
- unsigned long symbol_addr;
- int i, reloc_type, symtab_index;
- /* Now parse the relocation information */
- rel_size = rel_size / sizeof(Elf32_Rel);
- rpnt = (Elf32_Rel *) (rel_addr + tpnt->loadaddr);
- symtab = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] + tpnt->loadaddr);
- strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] + tpnt->loadaddr);
- got = (unsigned long *) (tpnt->dynamic_info[DT_PLTGOT] + tpnt->loadaddr);
- 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;
- if (!symtab_index && tpnt->libtype == program_interpreter)
- continue;
- switch (reloc_type) {
- case R_MIPS_REL32:
- if (symtab_index) {
- if (symtab_index < tpnt->mips_gotsym)
- *reloc_addr +=
- symtab[symtab_index].st_value +
- (unsigned long) tpnt->loadaddr;
- else {
- *reloc_addr += got[symtab_index + tpnt->mips_local_gotno -
- tpnt->mips_gotsym];
- }
- }
- else {
- *reloc_addr += (unsigned long) tpnt->loadaddr;
- }
- break;
- case R_MIPS_NONE:
- break;
- default:
- _dl_dprintf(2, "%s: can't handle reloc type ", _dl_progname);
- if (symtab_index)
- _dl_dprintf(2, "'%s'\n", strtab + symtab[symtab_index].st_name);
- _dl_exit(1);
- };
- };
- return 0;
- }
- void _dl_perform_mips_global_got_relocations(struct elf_resolve *tpnt)
- {
- Elf32_Sym *sym;
- char *strtab;
- unsigned long i;
- 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->loadaddr +
- tpnt->dynamic_info[DT_PLTGOT]) + tpnt->mips_local_gotno;
- sym = (Elf32_Sym *) (tpnt->dynamic_info[DT_SYMTAB] +
- (unsigned long) tpnt->loadaddr) + tpnt->mips_gotsym;
- strtab = (char *) (tpnt->dynamic_info[DT_STRTAB] +
- (unsigned long) tpnt->loadaddr);
- i = tpnt->mips_symtabno - tpnt->mips_gotsym;
- /* Relocate the global GOT entries for the object */
- while(i--) {
- #if defined (__SUPPORT_LD_DEBUG__)
- _dl_dprintf(2,"BEFORE: %s=%x\n", strtab + sym->st_name,
- *got_entry);
- #endif
- if (sym->st_shndx == SHN_UNDEF) {
- if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC && sym->st_value)
- *got_entry = sym->st_value + (unsigned long) tpnt->loadaddr;
- else {
- *got_entry = (unsigned long) _dl_find_hash(strtab +
- sym->st_name, tpnt->symbol_scope, NULL, copyrel);
- }
- }
- else if (sym->st_shndx == SHN_COMMON) {
- *got_entry = (unsigned long) _dl_find_hash(strtab +
- sym->st_name, tpnt->symbol_scope, NULL, copyrel);
- }
- else if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC &&
- *got_entry != sym->st_value)
- *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, NULL, copyrel);
- }
- #if defined (__SUPPORT_LD_DEBUG__)
- if (*got_entry == 0)
- _dl_dprintf(2,"ZERO: %s\n", strtab + sym->st_name);
- else
- _dl_dprintf(2," AFTER: %s=%x\n", strtab + sym->st_name,
- *got_entry);
- #endif
- got_entry++;
- sym++;
- }
- }
- }
|