engine: android: restore dlsym hack for old Android(<5.0)
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@ -0,0 +1,94 @@
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/*
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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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#ifdef __ANDROID__
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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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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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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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@ -0,0 +1,21 @@
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/*
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dlsym-weak.h -- custom dlsym() function to override bionic libc bug on Android <5.0
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Copyright (C) 2015-2017 Flying With Gauss
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#ifndef DLSYM_WEAH_H
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#define DLSYM_WEAK_H
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// ------------ dlsym-weak.cpp ------------ //
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void* dlsym_weak(void* handle, const char* symbol);
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#endif
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@ -18,8 +18,8 @@ GNU General Public License for more details.
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#include "library.h"
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#include "filesystem.h"
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#include "server.h"
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#include "platform/android/android_lib.h"
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#include "platform/android/dlsym_weak.h" // Android < 5.0
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#include "platform/android/lib_android.h"
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#include "platform/android/dlsym-weak.h" // Android < 5.0
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void *ANDROID_LoadLibrary( const char *dllname )
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{
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@ -0,0 +1,202 @@
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/*
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* Copyright (C) 2008 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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#ifndef _LINKER_H_
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#define _LINKER_H_
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#ifdef __ANDROID__
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#include <unistd.h>
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#include <sys/types.h>
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#include <elf.h>
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#include <sys/exec_elf.h>
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#include <link.h>
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// Returns the address of the page containing address 'x'.
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#define PAGE_START(x) ((x) & PAGE_MASK)
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// Returns the offset of address 'x' in its page.
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#define PAGE_OFFSET(x) ((x) & ~PAGE_MASK)
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// Returns the address of the next page after address 'x', unless 'x' is
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// itself at the start of a page.
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#define PAGE_END(x) PAGE_START((x) + (PAGE_SIZE-1))
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// Magic shared structures that GDB knows about.
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struct link_map_t {
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uintptr_t l_addr;
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char* l_name;
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uintptr_t l_ld;
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link_map_t* l_next;
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link_map_t* l_prev;
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};
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// Values for r_debug->state
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enum {
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RT_CONSISTENT,
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RT_ADD,
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RT_DELETE
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};
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#if 0
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struct r_debug {
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int32_t r_version;
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link_map_t* r_map;
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void (*r_brk)(void);
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int32_t r_state;
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uintptr_t r_ldbase;
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};
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#endif
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#define FLAG_LINKED 0x00000001
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#define FLAG_EXE 0x00000004 // The main executable
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#define FLAG_LINKER 0x00000010 // The linker itself
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#define SOINFO_NAME_LEN 128
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typedef void (*linker_function_t)();
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// Android uses REL for 32-bit but only uses RELA for 64-bit.
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#if defined(__LP64__)
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#define USE_RELA 1
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#endif
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struct soinfo {
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public:
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char name[SOINFO_NAME_LEN];
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const Elf_Phdr* phdr;
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size_t phnum;
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Elf_Addr entry;
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Elf_Addr base;
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unsigned size;
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#ifndef __LP64__
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uint32_t unused1; // DO NOT USE, maintained for compatibility.
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#endif
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Elf_Dyn* dynamic;
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#ifndef __LP64__
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uint32_t unused2; // DO NOT USE, maintained for compatibility
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uint32_t unused3; // DO NOT USE, maintained for compatibility
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#endif
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soinfo* next;
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unsigned flags;
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const char* strtab;
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Elf_Sym* symtab;
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size_t nbucket;
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size_t nchain;
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unsigned* bucket;
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unsigned* chain;
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#if !defined(__LP64__)
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// This is only used by 32-bit MIPS, but needs to be here for
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// all 32-bit architectures to preserve binary compatibility.
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unsigned* plt_got;
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#endif
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#if defined(USE_RELA)
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Elf_Rela* plt_rela;
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size_t plt_rela_count;
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Elf_Rela* rela;
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size_t rela_count;
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#else
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Elf_Rel* plt_rel;
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size_t plt_rel_count;
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Elf_Rel* rel;
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size_t rel_count;
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#endif
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linker_function_t* preinit_array;
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size_t preinit_array_count;
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linker_function_t* init_array;
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size_t init_array_count;
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linker_function_t* fini_array;
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size_t fini_array_count;
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linker_function_t init_func;
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linker_function_t fini_func;
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#if defined(__arm__)
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// ARM EABI section used for stack unwinding.
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unsigned* ARM_exidx;
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size_t ARM_exidx_count;
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#elif defined(__mips__)
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unsigned mips_symtabno;
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unsigned mips_local_gotno;
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unsigned mips_gotsym;
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#endif
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size_t ref_count;
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link_map_t link_map;
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bool constructors_called;
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// When you read a virtual address from the ELF file, add this
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// value to get the corresponding address in the process' address space.
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Elf_Addr load_bias;
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#if !defined(__LP64__)
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bool has_text_relocations;
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#endif
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bool has_DT_SYMBOLIC;
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void CallConstructors();
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void CallDestructors();
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void CallPreInitConstructors();
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private:
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void CallArray(const char* array_name, linker_function_t* functions, size_t count, bool reverse);
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void CallFunction(const char* function_name, linker_function_t function);
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};
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extern soinfo libdl_info;
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void do_android_update_LD_LIBRARY_PATH(const char* ld_library_path);
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soinfo* do_dlopen(const char* name, int flags);
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int do_dlclose(soinfo* si);
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Elf_Sym* dlsym_linear_lookup(const char* name, soinfo** found, soinfo* start);
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soinfo* find_containing_library(const void* addr);
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Elf_Sym* dladdr_find_symbol(soinfo* si, const void* addr);
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Elf_Sym* dlsym_handle_lookup(soinfo* si, const char* name);
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void debuggerd_init();
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extern "C" void notify_gdb_of_libraries();
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char* linker_get_error_buffer();
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size_t linker_get_error_buffer_size();
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#endif
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#endif
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