/**
* Tell the VFPU to execute an instruction, wait for it to finish, return the result
* TODO: Make this not mix C++ and C so badly?
* TODO: It will still only work for magic 32 bit FPU
*/
Register Exec(const Register & a, const Register & b, Opcode op, Rmode rmode)
{
assert(g_running);
stringstream s;
s << hex << setw(8) << setfill('0') << a.to_ulong() << "\n" << b.to_ulong() << "\n" << setw(1) << op <<"\n" << setw(1) << rmode << "\n";
string str(s.str());
//Debug("Writing: %s", str.c_str());
// So we used C++ streams to make our C string...
assert(write(g_fpu_socket[1], str.c_str(), str.size()) == (int)str.size());
char buffer[BUFSIZ];
int len = read(g_fpu_socket[1], buffer, sizeof(buffer));
//assert(len == 9);
buffer[--len] = '\0'; // Get rid of newline
//Debug("Read: %s", buffer);
Register result(0);
for (int i = 0; i < len/2; ++i)
{
unsigned byte; // It is ONE byte (2 nibbles == 2 hex digits)
sscanf(buffer+2*i, "%02x", &byte);
result |= (byte << 8*(len/2-i-1));
}
stringstream s2;
//TODO: Make it compile on non C++11
s2 << hex << result.to_ulong();
//Debug("Result is: %s", s2.str().c_str());
return result;
}
