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- /* Xtensa ELF shared library loader suppport
- *
- * Copyright (C) 2007 Tensilica Inc.
- * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
- * David Engel, Hongjiu Lu and Mitch D'Souza
- * Copyright (C) 2001-2004 Erik Andersen
- *
- * 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"
- #if defined(USE_TLS) && USE_TLS
- #include "dl-tls.h"
- #include "tlsdeschtab.h"
- #endif
- unsigned long
- _dl_linux_resolver (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;
- char *symname;
- rel_addr = (char *) tpnt->dynamic_info[DT_JMPREL];
- this_reloc = (ELF_RELOC *) (rel_addr + reloc_entry);
- symtab_index = ELF_R_SYM (this_reloc->r_info);
- symtab = (ElfW(Sym) *) tpnt->dynamic_info[DT_SYMTAB];
- strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
- symname = strtab + symtab[symtab_index].st_name;
- /* Address of the literal to fix up. */
- got_addr = (char **) (this_reloc->r_offset + tpnt->loadaddr);
- /* 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'\n",
- _dl_progname, symname);
- _dl_exit (1);
- }
- #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 = new_addr;
- #else
- *got_addr = new_addr;
- #endif
- return (unsigned long) new_addr;
- }
- static int
- _dl_parse (struct elf_resolve *tpnt, struct r_scope_elem *scope,
- unsigned long rel_addr, unsigned long rel_size,
- int (*reloc_fnc) (struct elf_resolve *tpnt, struct r_scope_elem *scope,
- ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab))
- {
- unsigned int i;
- char *strtab;
- ElfW(Sym) *symtab;
- ELF_RELOC *rpnt;
- int symtab_index;
- /* Parse the relocation information. */
- rpnt = (ELF_RELOC *) rel_addr;
- rel_size /= sizeof (ELF_RELOC);
- symtab = (ElfW(Sym) *) tpnt->dynamic_info[DT_SYMTAB];
- strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
- for (i = 0; i < rel_size; i++, rpnt++) {
- int res;
- symtab_index = ELF_R_SYM (rpnt->r_info);
- debug_sym (symtab, strtab, symtab_index);
- debug_reloc (symtab, strtab, rpnt);
- res = reloc_fnc (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 (unlikely (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);
- }
- if (unlikely (res > 0)) {
- _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,
- ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab)
- {
- int reloc_type;
- int symtab_index;
- char *symname;
- #if defined USE_TLS && USE_TLS
- struct elf_resolve *tls_tpnt = NULL;
- #endif
- struct symbol_ref sym_ref;
- ElfW(Addr) *reloc_addr;
- ElfW(Addr) symbol_addr;
- #if defined (__SUPPORT_LD_DEBUG__)
- ElfW(Addr) old_val;
- #endif
- reloc_addr = (ElfW(Addr) *) (tpnt->loadaddr + rpnt->r_offset);
- reloc_type = ELF_R_TYPE (rpnt->r_info);
- symtab_index = ELF_R_SYM (rpnt->r_info);
- sym_ref.sym = &symtab[symtab_index];
- sym_ref.tpnt = NULL;
- symbol_addr = 0;
- symname = strtab + sym_ref.sym->st_name;
- if (symtab_index) {
- symbol_addr = (ElfW(Addr))
- _dl_find_hash (symname, scope, tpnt,
- elf_machine_type_class (reloc_type), &sym_ref);
- /*
- * We want to allow undefined references to weak symbols - this might
- * have been intentional. We should not be linking local symbols
- * here, so all bases should be covered.
- */
- if (unlikely (!symbol_addr &&
- ELF_ST_TYPE (sym_ref.sym->st_info) != STT_TLS &&
- ELF_ST_BIND (sym_ref.sym->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 defined USE_TLS && USE_TLS
- tls_tpnt = sym_ref.tpnt;
- #endif
- } else {
- symbol_addr =symtab[symtab_index].st_value;
- #if defined USE_TLS && USE_TLS
- tls_tpnt = tpnt;
- #endif
- }
- #if defined (__SUPPORT_LD_DEBUG__)
- old_val = *reloc_addr;
- #endif
- switch (reloc_type) {
- case R_XTENSA_NONE:
- break;
- case R_XTENSA_GLOB_DAT:
- case R_XTENSA_JMP_SLOT:
- *reloc_addr = symbol_addr + rpnt->r_addend;
- break;
- case R_XTENSA_RTLD:
- if (rpnt->r_addend == 1) {
- /* Grab the function pointer stashed at the beginning
- of the GOT by the GOT_INIT function. */
- *reloc_addr = *(ElfW(Addr) *) tpnt->dynamic_info[DT_PLTGOT];
- } else if (rpnt->r_addend == 2) {
- /* Store the link map for the object. */
- *reloc_addr = (ElfW(Addr)) tpnt;
- } else {
- _dl_exit (1);
- }
- break;
- case R_XTENSA_RELATIVE:
- *reloc_addr += tpnt->loadaddr + rpnt->r_addend;
- break;
- #if defined USE_TLS && USE_TLS
- case R_XTENSA_TLS_TPOFF:
- CHECK_STATIC_TLS((struct link_map *) tls_tpnt);
- *reloc_addr = symbol_addr + tls_tpnt->l_tls_offset + rpnt->r_addend;
- break;
- case R_XTENSA_TLSDESC_FN:
- #ifndef SHARED
- CHECK_STATIC_TLS((struct link_map *) tls_tpnt);
- #else
- if (!TRY_STATIC_TLS ((struct link_map *) tls_tpnt))
- *reloc_addr = (ElfW(Addr)) _dl_tlsdesc_dynamic;
- else
- #endif
- *reloc_addr = (ElfW(Addr)) _dl_tlsdesc_return;
- break;
- case R_XTENSA_TLSDESC_ARG:
- #ifndef SHARED
- CHECK_STATIC_TLS((struct link_map *) tls_tpnt);
- #else
- if (!TRY_STATIC_TLS ((struct link_map *) tls_tpnt))
- *reloc_addr = (ElfW(Addr))
- _dl_make_tlsdesc_dynamic((struct link_map *) tls_tpnt,
- symbol_addr + rpnt->r_addend);
- else
- #endif
- *reloc_addr = symbol_addr + rpnt->r_addend +
- tls_tpnt->l_tls_offset;
- break;
- #endif
- default:
- return -1; /* Calls _dl_exit(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, reloc_addr);
- #endif
- return 0;
- }
- static int
- _dl_do_lazy_reloc (struct elf_resolve *tpnt, struct r_scope_elem *scope,
- ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab)
- {
- int reloc_type;
- ElfW(Addr) *reloc_addr;
- #if defined (__SUPPORT_LD_DEBUG__)
- ElfW(Addr) old_val;
- #endif
- reloc_addr = (ElfW(Addr) *) (tpnt->loadaddr + rpnt->r_offset);
- reloc_type = ELF_R_TYPE (rpnt->r_info);
- #if defined (__SUPPORT_LD_DEBUG__)
- old_val = *reloc_addr;
- #endif
- switch (reloc_type) {
- case R_XTENSA_JMP_SLOT:
- /* Perform a RELATIVE reloc on the GOT entry that transfers
- to the stub function. */
- *reloc_addr += tpnt->loadaddr;
- break;
- case R_XTENSA_NONE:
- break;
- default:
- _dl_exit (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, reloc_addr);
- #endif
- return 0;
- }
- void
- _dl_parse_lazy_relocation_information (struct dyn_elf *rpnt,
- unsigned long rel_addr,
- unsigned long rel_size)
- {
- (void) _dl_parse (rpnt->dyn, NULL, rel_addr, rel_size, _dl_do_lazy_reloc);
- }
- 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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