// hasBeenBound: returns true if the runtime linker has bound the
// function symbol corresponding to the relocation entry in at the address
// specified by entry and base_addr. If it has been bound, then the callee
// function is returned in "target_pdf", else it returns false.
bool PCProcess::hasBeenBound(const relocationEntry &entry,
func_instance *&target_pdf, Address base_addr) {
if (isTerminated()) return false;
// if the relocationEntry has not been bound yet, then the value
// at rel_addr is the address of the instruction immediately following
// the first instruction in the PLT entry (which is at the target_addr)
// The PLT entries are never modified, instead they use an indirrect
// jump to an address stored in the _GLOBAL_OFFSET_TABLE_. When the
// function symbol is bound by the runtime linker, it changes the address
// in the _GLOBAL_OFFSET_TABLE_ corresponding to the PLT entry
Address got_entry = entry.rel_addr() + base_addr;
Address bound_addr = 0;
if(!readDataSpace((const void*)got_entry, sizeof(Address),
&bound_addr, true)){
sprintf(errorLine, "read error in process::hasBeenBound addr 0x%x, pid=%d\n (readDataSpace returns 0)",(unsigned)got_entry,getPid());
logLine(errorLine);
print_read_error_info(entry, target_pdf, base_addr);
return false;
}
if( !( bound_addr == (entry.target_addr()+6+base_addr)) ) {
// the callee function has been bound by the runtime linker
// find the function and return it
target_pdf = findOneFuncByAddr(bound_addr);
if(!target_pdf){
return false;
}
return true;
}
return false;
}
void print_read_error_info(const relocationEntry entry,
func_instance *&target_pdf, Address base_addr) {
sprintf(errorLine, " entry : target_addr 0x%x\n",
(unsigned)entry.target_addr());
logLine(errorLine);
sprintf(errorLine, " rel_addr 0x%x\n", (unsigned)entry.rel_addr());
logLine(errorLine);
sprintf(errorLine, " name %s\n", (entry.name()).c_str());
logLine(errorLine);
if (target_pdf) {
sprintf(errorLine, " target_pdf : symTabName %s\n",
(target_pdf->symTabName()).c_str());
logLine(errorLine);
sprintf(errorLine , " prettyName %s\n",
(target_pdf->symTabName()).c_str());
logLine(errorLine);
/*
// Size bad. <smack>
sprintf(errorLine , " size %i\n",
target_pdf->getSize());
logLine(errorLine);
*/
sprintf(errorLine , " addr 0x%x\n",
(unsigned)target_pdf->addr());
logLine(errorLine);
}
sprintf(errorLine, " base_addr 0x%x\n", (unsigned)base_addr);
logLine(errorLine);
}
