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