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#include "mips.h"
// Used to define the generic instruction implementation
struct instruction_impl{
char type;
uint8_t opCode;
// Only used for an 'actual' function rather than instruction set member
uint32_t data;
// Constructor where there is actual raw data
instruction_impl(uint32_t dataIn, char typeIn):
type(typeIn),
opCode(uint8_t((dataIn & 0xFC000000) >> 26)),
data(dataIn){}
};
// Used for R type instructions, inherits the generic function type
struct instruction_impl_r : public instruction_impl{
uint8_t source1;
uint8_t source2;
uint8_t dest;
uint8_t shift;
uint8_t function;
// Constructor specifying each part of the instruction
instruction_impl_r(
uint8_t source1In,
uint8_t source2In,
uint8_t destIn,
uint8_t shiftIn,
uint8_t functionIn):
instruction_impl(
uint32_t(
0x00000000 | ((uint32_t(source1In) & 0x0000001F) << 21) |
((uint32_t(source2In) & 0x0000001F) << 16) |
((uint32_t(destIn) & 0x0000001F) << 11) |
((uint32_t(shiftIn) & 0x0000001F) << 6) |
(uint32_t(functionIn) & 0x0000003F)),
'r'),
source1(source1In),
source2(source2In),
dest(destIn),
shift(shiftIn),
function(functionIn){}
};
// Used for J type instructions, inherits the generic function type
struct instruction_impl_j: public instruction_impl{
uint32_t address;
instruction_impl_j(uint8_t opCodeIn, uint32_t addressIn):
instruction_impl(uint32_t(((uint32_t(opCodeIn) & 0x0000003F) << 26) | (addressIn & 0x03FFFFFF)), 'j'),
address(addressIn){}
};
// Used for I type instructions, inherits the generic function type
struct instruction_impl_i: public instruction_impl{
uint8_t source;
uint8_t dest;
uint16_t immediate;
// Constructor specifying each part of the instruction
instruction_impl_i(uint8_t opCodeIn, uint8_t sourceIn, uint8_t destIn, uint16_t immediateIn):
instruction_impl(
uint32_t(
0x00000000 | ((uint32_t(opCodeIn) & 0x0000003F) << 26) |
((uint32_t(sourceIn) & 0x0000001F) << 21) |
((uint32_t(destIn) & 0x0000001F) << 16) |
(uint32_t(immediateIn))),
'i'),
source(sourceIn),
dest(destIn),
immediate(immediateIn){}
};
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