MIPS K0/K1 Kernel Register Printer

mips32_kreg_printer.cpp

#include <unordered_set>
#include <cstdio>

//Represents bits from a register
#define reg_t unsigned

//Keep track of register contents seen already
std::unordered_set<reg_t> ks;

//Read either K0 or K1
static reg_t read_k( unsigned reg )
{
reg_t x;
#if __mips__
    if( reg == 0 )
        asm volatile ("move %0, $k0" : "=r" (x));
    else
        asm volatile ("move %0, $k1" : "=r" (x));
#else
    #error "Incorrect CPU architecture"
#endif
return x;
}

//
int main( void )
{
unsigned reg = 1;
while(1)
    {
    reg ^= 1;
    reg_t k = read_k( reg );
    if(!ks.count(k))
        {
        std::printf("Found new k%u:0x%08x\n",reg,k);
        ks.insert(k);
        }
    }
}