Appendix 2.  Modula-2 Runtime Support Routines


Call runtime support routine r: CALL r (CALL = 70B)

 r    Name            Function                        Stack Operands            Stack Result

 0    Trap            System trap                    trap number                -
 1    Move            Move block                    dest, source, length        -
 2    IMul            Multiply integers            factor1, factor2            product
 3    IDiv            Divide integers                dividend, divisor        quotient
 4    IMod            Calculate congruence        number, modulus        congruence            
 5    RAdd        Add reals                    operand1, operand2    result
 6    RSub            Subtract reals                operand1, operand2    result
 7    RMult        Multiply reals                operand1, operand2    result
 8    RDiv            Divide reals                    operand1, operand2    result
 9    Alloc            Allocate memory block    size                        base address
10    Dealloc        Deallocate memory block    base address                -
11    MakeBit        Make singleton bitset        bit number                { bit number }
12    MakeBits        Make range bitset            lowBit, highBit            { lowBit .. highBit }