456afe24b6
Bug: http://b/20694161
Change-Id: I5cc58034f9776e1db9cddc34abe48ef85f6048f4
(cherry picked from commit dbe26fdcc7)
200 lines
7.4 KiB
C++
200 lines
7.4 KiB
C++
/*
|
|
* Copyright (C) 2015 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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
|
|
* COPYRIGHT OWNER OR 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 "linker.h"
|
|
#include "linker_debug.h"
|
|
#include "linker_relocs.h"
|
|
#include "linker_reloc_iterators.h"
|
|
#include "linker_sleb128.h"
|
|
|
|
template bool soinfo::relocate<plain_reloc_iterator>(const VersionTracker& version_tracker,
|
|
plain_reloc_iterator&& rel_iterator,
|
|
const soinfo_list_t& global_group,
|
|
const soinfo_list_t& local_group);
|
|
|
|
template bool soinfo::relocate<packed_reloc_iterator<sleb128_decoder>>(
|
|
const VersionTracker& version_tracker,
|
|
packed_reloc_iterator<sleb128_decoder>&& rel_iterator,
|
|
const soinfo_list_t& global_group,
|
|
const soinfo_list_t& local_group);
|
|
|
|
template <typename ElfRelIteratorT>
|
|
bool soinfo::relocate(const VersionTracker& version_tracker,
|
|
ElfRelIteratorT&& rel_iterator,
|
|
const soinfo_list_t& global_group,
|
|
const soinfo_list_t& local_group) {
|
|
for (size_t idx = 0; rel_iterator.has_next(); ++idx) {
|
|
const auto rel = rel_iterator.next();
|
|
|
|
if (rel == nullptr) {
|
|
return false;
|
|
}
|
|
|
|
ElfW(Word) type = ELFW(R_TYPE)(rel->r_info);
|
|
ElfW(Word) sym = ELFW(R_SYM)(rel->r_info);
|
|
|
|
ElfW(Addr) reloc = static_cast<ElfW(Addr)>(rel->r_offset + load_bias);
|
|
ElfW(Addr) sym_addr = 0;
|
|
const char* sym_name = nullptr;
|
|
|
|
DEBUG("Processing '%s' relocation at index %zd", get_soname(), idx);
|
|
if (type == R_GENERIC_NONE) {
|
|
continue;
|
|
}
|
|
|
|
const ElfW(Sym)* s = nullptr;
|
|
soinfo* lsi = nullptr;
|
|
|
|
if (sym != 0) {
|
|
sym_name = get_string(symtab_[sym].st_name);
|
|
const version_info* vi = nullptr;
|
|
|
|
if (!lookup_version_info(version_tracker, sym, sym_name, &vi)) {
|
|
return false;
|
|
}
|
|
|
|
if (!soinfo_do_lookup(this, sym_name, vi, &lsi, global_group, local_group, &s)) {
|
|
return false;
|
|
}
|
|
|
|
if (s == nullptr) {
|
|
// mips does not support relocation with weak-undefined symbols
|
|
DL_ERR("cannot locate symbol \"%s\" referenced by \"%s\"...", sym_name, get_soname());
|
|
return false;
|
|
} else {
|
|
// We got a definition.
|
|
sym_addr = lsi->resolve_symbol_address(s);
|
|
}
|
|
count_relocation(kRelocSymbol);
|
|
}
|
|
|
|
switch (type) {
|
|
case R_MIPS_REL32:
|
|
#if defined(__LP64__)
|
|
// MIPS Elf64_Rel entries contain compound relocations
|
|
// We only handle the R_MIPS_NONE|R_MIPS_64|R_MIPS_REL32 case
|
|
if (ELF64_R_TYPE2(rel->r_info) != R_MIPS_64 ||
|
|
ELF64_R_TYPE3(rel->r_info) != R_MIPS_NONE) {
|
|
DL_ERR("Unexpected compound relocation type:%d type2:%d type3:%d @ %p (%zu)",
|
|
type, static_cast<unsigned>(ELF64_R_TYPE2(rel->r_info)),
|
|
static_cast<unsigned>(ELF64_R_TYPE3(rel->r_info)), rel, idx);
|
|
return false;
|
|
}
|
|
#endif
|
|
count_relocation(s == nullptr ? kRelocAbsolute : kRelocRelative);
|
|
MARK(rel->r_offset);
|
|
TRACE_TYPE(RELO, "RELO REL32 %08zx <- %08zx %s", static_cast<size_t>(reloc),
|
|
static_cast<size_t>(sym_addr), sym_name ? sym_name : "*SECTIONHDR*");
|
|
if (s != nullptr) {
|
|
*reinterpret_cast<ElfW(Addr)*>(reloc) += sym_addr;
|
|
} else {
|
|
*reinterpret_cast<ElfW(Addr)*>(reloc) += load_bias;
|
|
}
|
|
break;
|
|
default:
|
|
DL_ERR("unknown reloc type %d @ %p (%zu)", type, rel, idx);
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool soinfo::mips_relocate_got(const VersionTracker& version_tracker,
|
|
const soinfo_list_t& global_group,
|
|
const soinfo_list_t& local_group) {
|
|
ElfW(Addr)** got = plt_got_;
|
|
if (got == nullptr) {
|
|
return true;
|
|
}
|
|
|
|
// got[0] is the address of the lazy resolver function.
|
|
// got[1] may be used for a GNU extension.
|
|
// Set it to a recognizable address in case someone calls it (should be _rtld_bind_start).
|
|
// FIXME: maybe this should be in a separate routine?
|
|
if ((flags_ & FLAG_LINKER) == 0) {
|
|
size_t g = 0;
|
|
got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadbeef);
|
|
if (reinterpret_cast<intptr_t>(got[g]) < 0) {
|
|
got[g++] = reinterpret_cast<ElfW(Addr)*>(0xdeadfeed);
|
|
}
|
|
// Relocate the local GOT entries.
|
|
for (; g < mips_local_gotno_; g++) {
|
|
got[g] = reinterpret_cast<ElfW(Addr)*>(reinterpret_cast<uintptr_t>(got[g]) + load_bias);
|
|
}
|
|
}
|
|
|
|
// Now for the global GOT entries...
|
|
got = plt_got_ + mips_local_gotno_;
|
|
for (ElfW(Word) sym = mips_gotsym_; sym < mips_symtabno_; sym++, got++) {
|
|
// This is an undefined reference... try to locate it.
|
|
const ElfW(Sym)* local_sym = symtab_ + sym;
|
|
const char* sym_name = get_string(local_sym->st_name);
|
|
soinfo* lsi = nullptr;
|
|
const ElfW(Sym)* s = nullptr;
|
|
|
|
ElfW(Word) st_visibility = (local_sym->st_other & 0x3);
|
|
|
|
if (st_visibility == STV_DEFAULT) {
|
|
const version_info* vi = nullptr;
|
|
|
|
if (!lookup_version_info(version_tracker, sym, sym_name, &vi)) {
|
|
return false;
|
|
}
|
|
|
|
if (!soinfo_do_lookup(this, sym_name, vi, &lsi, global_group, local_group, &s)) {
|
|
return false;
|
|
}
|
|
} else if (st_visibility == STV_PROTECTED) {
|
|
if (local_sym->st_value == 0) {
|
|
DL_ERR("%s: invalid symbol \"%s\" (PROTECTED/UNDEFINED) ", get_soname(), sym_name);
|
|
return false;
|
|
}
|
|
s = local_sym;
|
|
lsi = this;
|
|
} else {
|
|
DL_ERR("%s: invalid symbol \"%s\" visibility: 0x%x", get_soname(), sym_name, st_visibility);
|
|
return false;
|
|
}
|
|
|
|
if (s == nullptr) {
|
|
// We only allow an undefined symbol if this is a weak reference.
|
|
if (ELF_ST_BIND(local_sym->st_info) != STB_WEAK) {
|
|
DL_ERR("%s: cannot locate \"%s\"...", get_soname(), sym_name);
|
|
return false;
|
|
}
|
|
*got = 0;
|
|
} else {
|
|
// FIXME: is this sufficient?
|
|
// For reference see NetBSD link loader
|
|
// http://cvsweb.netbsd.org/bsdweb.cgi/src/libexec/ld.elf_so/arch/mips/mips_reloc.c?rev=1.53&content-type=text/x-cvsweb-markup
|
|
*got = reinterpret_cast<ElfW(Addr)*>(lsi->resolve_symbol_address(s));
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|