mirror of
https://github.com/w23/xash3d-fwgs
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99 lines
3.4 KiB
C++
99 lines
3.4 KiB
C++
/*
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* Copyright (C) 2008, 2009 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined __ANDROID__ && !defined XASH_64BIT
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#include <string.h>
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#include <android/log.h>
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#include "linker.h"
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static Elf_Sym* soinfo_elf_lookup(soinfo* si, unsigned hash, const char* name) {
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Elf_Sym* symtab = si->symtab;
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const char* strtab = si->strtab;
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if( si->nbucket == 0 )
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return NULL;
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for (unsigned n = si->bucket[hash % si->nbucket]; n != 0; n = si->chain[n]) {
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Elf_Sym* s = symtab + n;
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if (strcmp(strtab + s->st_name, name)) continue;
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/* only concern ourselves with global and weak symbol definitions */
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switch (ELF_ST_BIND(s->st_info)) {
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case STB_GLOBAL:
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case STB_WEAK:
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if (s->st_shndx == SHN_UNDEF) {
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continue;
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}
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return s;
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}
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}
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return NULL;
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}
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static unsigned elfhash(const char* _name) {
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const unsigned char* name = (const unsigned char*) _name;
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unsigned h = 0, g;
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while(*name) {
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h = (h << 4) + *name++;
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g = h & 0xf0000000;
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h ^= g;
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h ^= g >> 24;
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}
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return h;
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}
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/* This is used by dlsym(3). It performs symbol lookup only within the
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specified soinfo object and not in any of its dependencies.
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TODO: Only looking in the specified soinfo seems wrong. dlsym(3) says
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that it should do a breadth first search through the dependency
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tree. This agrees with the ELF spec (aka System V Application
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Binary Interface) where in Chapter 5 it discuss resolving "Shared
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Object Dependencies" in breadth first search order.
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*/
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static Elf_Sym* dlsym_handle_lookup(soinfo* si, const char* name) {
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return soinfo_elf_lookup(si, elfhash(name), name);
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}
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extern "C" void* dlsym_weak(void* handle, const char* symbol) {
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soinfo* found = NULL;
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Elf_Sym* sym = NULL;
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found = reinterpret_cast<soinfo*>(handle);
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sym = dlsym_handle_lookup(found, symbol);
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if (sym != NULL) {
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return reinterpret_cast<void*>(sym->st_value + found->base/*load_bias*/);
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}
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__android_log_print(ANDROID_LOG_ERROR, "dlsym-weak", "Failed when looking up %s\n", symbol);
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return NULL;
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}
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#endif
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