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- /* 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);
- extern int _dl_runtime_pltresolve(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];
- ElfW(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 = ((ElfW(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,
- &_dl_loaded_modules->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
- 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;
- }
- unsigned long
- __dl_runtime_pltresolve(struct elf_resolve *tpnt, int reloc_entry)
- {
- ELF_RELOC *this_reloc;
- char *strtab;
- ElfW(Sym) *symtab;
- int symtab_index;
- char *rel_addr;
- char *new_addr;
- char **got_addr;
- unsigned long instr_addr;
- char *symname;
- rel_addr = (char *)tpnt->dynamic_info[DT_JMPREL];
- this_reloc = (ELF_RELOC *)(intptr_t)(rel_addr + reloc_entry);
- symtab_index = ELF_R_SYM(this_reloc->r_info);
- symtab = (ElfW(Sym) *)(intptr_t)tpnt->dynamic_info[DT_SYMTAB];
- strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
- symname = strtab + symtab[symtab_index].st_name;
- /* Address of the jump instruction to fix up. */
- instr_addr = ((unsigned long)this_reloc->r_offset +
- (unsigned long)tpnt->loadaddr);
- got_addr = (char **)instr_addr;
- /* Get the address of the GOT entry. */
- new_addr = _dl_find_hash(symname, &_dl_loaded_modules->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
- if (unlikely(!new_addr)) {
- _dl_dprintf(2, "%s: can't resolve symbol '%s' in lib '%s'.\n", _dl_progname, symname, tpnt->libname);
- _dl_exit(1);
- }
- #if defined (__SUPPORT_LD_DEBUG__)
- if ((unsigned long)got_addr < 0x40000000) {
- 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",
- *got_addr, new_addr, got_addr);
- }
- }
- if (!_dl_debug_nofixups) {
- *got_addr = new_addr;
- }
- #else
- *got_addr = new_addr;
- #endif
- return (unsigned long)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,
- struct r_scope_elem *scope, unsigned long rel_addr, unsigned long rel_size)
- {
- ElfW(Sym) *symtab;
- ELF_RELOC *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;
- char *symname = NULL;
- #if defined (__SUPPORT_LD_DEBUG__)
- unsigned long old_val=0;
- #endif
- struct symbol_ref sym_ref;
- /* Now parse the relocation information */
- rel_size = rel_size / sizeof(ElfW(Rel));
- rpnt = (ELF_RELOC *) rel_addr;
- symtab = (ElfW(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 = ELF_R_TYPE(rpnt->r_info);
- symtab_index = ELF_R_SYM(rpnt->r_info);
- symbol_addr = 0;
- debug_sym(symtab,strtab,symtab_index);
- debug_reloc(symtab,strtab,rpnt);
- symname = strtab + symtab[symtab_index].st_name;
- #if defined (__SUPPORT_LD_DEBUG__)
- if (reloc_addr)
- old_val = *reloc_addr;
- #endif
- if (reloc_type == R_MIPS_JUMP_SLOT || reloc_type == R_MIPS_COPY) {
- sym_ref.tpnt = NULL;
- sym_ref.sym = &symtab[symtab_index];
- symbol_addr = (unsigned long)_dl_find_hash(symname,
- scope,
- tpnt,
- elf_machine_type_class(reloc_type), &sym_ref);
- if (unlikely(!symbol_addr && ELF_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK))
- return 1;
- if (_dl_trace_prelink) {
- _dl_debug_lookup (symname, tpnt, &symtab[symtab_index],
- &sym_ref, elf_machine_type_class(reloc_type));
- }
- }
- if (!symtab_index) {
- /* Relocs against STN_UNDEF are usually treated as using a
- * symbol value of zero, and using the module containing the
- * reloc itself.
- */
- symbol_addr = symtab[symtab_index].st_value;
- }
- switch (reloc_type) {
- #if defined USE_TLS && USE_TLS
- # if _MIPS_SIM == _MIPS_SIM_ABI64
- case R_MIPS_TLS_DTPMOD64:
- case R_MIPS_TLS_DTPREL64:
- case R_MIPS_TLS_TPREL64:
- # else
- case R_MIPS_TLS_DTPMOD32:
- case R_MIPS_TLS_DTPREL32:
- case R_MIPS_TLS_TPREL32:
- # endif
- {
- struct elf_resolve *tls_tpnt = NULL;
- sym_ref.sym = &symtab[symtab_index];
- sym_ref.tpnt = NULL;
- if (ELF_ST_BIND(symtab[symtab_index].st_info) != STB_LOCAL) {
- symbol_addr = (unsigned long) _dl_find_hash(symname, scope,
- tpnt, elf_machine_type_class(reloc_type), &sym_ref);
- tls_tpnt = sym_ref.tpnt;
- }
- /* In case of a TLS reloc, tls_tpnt NULL means we have an 'anonymous'
- symbol. This is the case for a static tls variable, so the lookup
- module is just that one is referencing the tls variable. */
- if (!tls_tpnt)
- tls_tpnt = tpnt;
- switch (reloc_type) {
- case R_MIPS_TLS_DTPMOD64:
- case R_MIPS_TLS_DTPMOD32:
- if (tls_tpnt)
- *(ElfW(Addr) *)reloc_addr = tls_tpnt->l_tls_modid;
- break;
- case R_MIPS_TLS_DTPREL64:
- case R_MIPS_TLS_DTPREL32:
- *(ElfW(Addr) *)reloc_addr +=
- TLS_DTPREL_VALUE (symbol_addr);
- break;
- case R_MIPS_TLS_TPREL32:
- case R_MIPS_TLS_TPREL64:
- CHECK_STATIC_TLS((struct link_map *)tls_tpnt);
- *(ElfW(Addr) *)reloc_addr +=
- TLS_TPREL_VALUE (tls_tpnt, symbol_addr);
- break;
- }
- break;
- }
- #endif /* USE_TLS */
- #if _MIPS_SIM == _MIPS_SIM_ABI64
- case (R_MIPS_64 << 8) | R_MIPS_REL32:
- #else /* O32 || N32 */
- case R_MIPS_REL32:
- #endif /* O32 || N32 */
- 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_JUMP_SLOT:
- *reloc_addr = symbol_addr;
- break;
- case R_MIPS_COPY:
- if (symbol_addr) {
- #if defined (__SUPPORT_LD_DEBUG__)
- if (_dl_debug_move)
- _dl_dprintf(_dl_debug_file,
- "\n%s move %d bytes from %x to %x",
- symname, symtab[symtab_index].st_size,
- symbol_addr, reloc_addr);
- #endif
- _dl_memcpy((char *)reloc_addr,
- (char *)symbol_addr,
- symtab[symtab_index].st_size);
- }
- break;
- case R_MIPS_NONE:
- break;
- default:
- {
- _dl_dprintf(2, "\n%s: ",_dl_progname);
- if (symtab_index)
- _dl_dprintf(2, "symbol '%s': ", symname);
- _dl_dprintf(2, "can't handle reloc type %x in lib '%s'\n", reloc_type, tpnt->libname);
- _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)
- {
- ElfW(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 = (ElfW(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 (ELF_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, &_dl_loaded_modules->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
- }
- }
- else if (sym->st_shndx == SHN_COMMON) {
- *got_entry = (unsigned long) _dl_find_hash(strtab +
- sym->st_name, &_dl_loaded_modules->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
- }
- else if (ELF_ST_TYPE(sym->st_info) == STT_FUNC &&
- *got_entry != sym->st_value && tmp_lazy) {
- *got_entry += (unsigned long) tpnt->loadaddr;
- }
- else if (ELF_ST_TYPE(sym->st_info) == STT_SECTION) {
- if (sym->st_other == 0)
- *got_entry += (unsigned long) tpnt->loadaddr;
- }
- else {
- struct symbol_ref sym_ref;
- sym_ref.sym = sym;
- sym_ref.tpnt = NULL;
- *got_entry = (unsigned long) _dl_find_hash(strtab +
- sym->st_name, &_dl_loaded_modules->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, &sym_ref);
- }
- got_entry++;
- sym++;
- }
- }
- }
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