1b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines/* 2b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines * Copyright 2011, The Android Open Source Project 3b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines * 4b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines * Licensed under the Apache License, Version 2.0 (the "License"); 5b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines * you may not use this file except in compliance with the License. 6b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines * You may obtain a copy of the License at 7b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines * 8b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines * http://www.apache.org/licenses/LICENSE-2.0 9b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines * 10b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines * Unless required by applicable law or agreed to in writing, software 11b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines * distributed under the License is distributed on an "AS IS" BASIS, 12b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines * See the License for the specific language governing permissions and 14b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines * limitations under the License. 15b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines */ 16b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines 17b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines#include <stdio.h> 18b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines#include "GOT.h" 19b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines 20b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hinesvoid *got_symbol_addresses[NUM_OF_GOT_ENTRY]; 21b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hinesint got_symbol_indexes[NUM_OF_GOT_ENTRY]; 22b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hinessize_t got_symbol_count = 0; 23b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines 24b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hinesvoid *got_address() 25b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines{ 26b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines return &got_symbol_addresses[0]; 27b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines} 28b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines 29b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hinesint search_got(int symbol_index, void *addr, uint8_t bind_type) 30b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines{ 31b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines size_t i; 32b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines 33b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines // For local symbols (R_MIPS_GOT16), we only store the high 16-bit value 34b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines // after adding 0x8000. 35b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines if (bind_type == STB_LOCAL) 36b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines addr = (void *)(((intptr_t)addr + 0x8000) & 0xFFFF0000); 37b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines 38b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines for (i = 0; i < got_symbol_count; i++) { 39b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines if (got_symbol_indexes[i] == symbol_index) { 40b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines if (bind_type == STB_LOCAL) { 41b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines // Check if the value is the same for local symbols. 42b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines // If yes, we can reuse this entry. 43b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines // If not, we continue searching. 44b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines if (got_symbol_addresses[i] == addr) { 45b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines return i; 46b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines } 47b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines } 48b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines else { 49b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines // The value must be the same for global symbols . 50b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines rsl_assert (got_symbol_addresses[i] == addr 51b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines && "MIPS GOT address error."); 52b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines return i; 53b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines } 54b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines } 55b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines } 56b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines 57b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines // Cannot find this symbol with correct value, so we need to create one 58b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines rsl_assert (got_symbol_count < NUM_OF_GOT_ENTRY && "MIPS GOT is full."); 59b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines got_symbol_indexes[got_symbol_count] = symbol_index; 60b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines got_symbol_addresses[got_symbol_count] = addr; 61b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines got_symbol_count++; 62b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines return (got_symbol_count - 1); 63b53c8a59e6f21ed36a0c3d9d4ce5834d4cc3c298Stephen Hines} 64