| /*␊ |
| * Symbols.c␊ |
| * ␊ |
| * Module loader support module. This module is the first module to ever be loaded.␊ |
| * It contains a copy of each symbol inside ov the current version of chameleon as well ␊ |
| * as a strcmp function. Chameleon calls lookup_symbol to resolve internal symbols␊ |
| * when they are requested by a module. This module does *not* depend on any intenrla␊ |
| * symbols, as such it can be loaded without a symbol table initialized.␊ |
| *␊ |
| * Copyright (c) 2009 Evan Lojewski. All rights reserved.␊ |
| */␊ |
| ␊ |
| #include "Symbols.h"␊ |
| ␊ |
| static int strcmp(const char * s1, const char * s2);␊ |
| ␊ |
| void Symbols_start()␊ |
| {␊ |
| }␊ |
| ␊ |
| unsigned int lookup_symbol(const char* symbol)␊ |
| {␊ |
| ␉if(strcmp(symbol, "dyld_stub_binder") == 0) return lookup_symbol("_dyld_stub_binder");␉// ugly hack␊ |
| ␉ ␊ |
| ␉int upperLimit = sizeof(symbolList) / sizeof(symbolList[0]) - 1;␉␉␊ |
| ␉int lowerLimit = 0;␊ |
| ␉int compareIndex = (upperLimit - lowerLimit) >> 1; // Midpoint␊ |
| ␉int result;␊ |
| ␉␊ |
| ␉while((result = strcmp(symbol, symbolList[compareIndex].symbol)) != 0)␊ |
| ␉{␊ |
| ␉␉if(result > 0)␉// We need to search a HIGHER index␊ |
| ␉␉{␊ |
| ␉␉␉if(compareIndex != lowerLimit)␊ |
| ␉␉␉{␊ |
| ␉␉␉␉lowerLimit = compareIndex;␊ |
| ␉␉␉}␊ |
| ␉␉␉else␊ |
| ␉␉␉{␊ |
| ␉␉␉␉return 0xFFFFFFFF;␉// Symbol not found␊ |
| ␉␉␉}␊ |
| ␉␉␉compareIndex = (upperLimit + lowerLimit + 1) >> 1;␉// Midpoint, round up␊ |
| ␉␉}␊ |
| ␉␉else // We Need to search a LOWER index␊ |
| ␉␉{␊ |
| ␉␉␉if(compareIndex != upperLimit)␊ |
| ␉␉␉{␊ |
| ␉␉␉␉upperLimit = compareIndex;␊ |
| ␉␉␉}␊ |
| ␉␉␉else␊ |
| ␉␉␉{␊ |
| ␉␉␉␉return 0xFFFFFFFF;␉// Symbol not found␊ |
| ␉␉␉}␊ |
| ␉␉␉compareIndex = (upperLimit + lowerLimit) >> 1;␉// Midpoint, round down␊ |
| ␉␉}␊ |
| ␉}␊ |
| ␉return symbolList[compareIndex].addr;␊ |
| }␊ |
| ␊ |
| /*␊ |
| * strcmp - Copied from libsa/string.c due to symbols not able to be resolved at this point␊ |
| */␊ |
| static int strcmp(const char * s1, const char * s2)␊ |
| {␊ |
| ␉while (*s1 && (*s1 == *s2)) {␊ |
| ␉␉s1++;␊ |
| ␉␉s2++;␊ |
| ␉}␊ |
| ␉return (*s1 - *s2);␊ |
| }␊ |
| ␊ |
| ␊ |
| ␊ |
