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Chips further away at documentation.

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Thomas Harte 2021-01-15 18:52:59 -05:00
parent fa4938f29c
commit e8ce70dccb
2 changed files with 57 additions and 12 deletions
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2
InstructionSets/x86/Decoder.cpp
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@ -376,7 +376,7 @@ std::pair<int, CPU::Decoder::x86::Instruction> Decoder::decode(const uint8_t *so
case 3:
memreg = reg_table[operation_size_][rm];
// LES and LDS accept a real memory argument only.
// LES and LDS accept a memory argument only, not a register.
if(operation_ == Operation::LES || operation_ == Operation::LDS) {
const auto result = std::make_pair(consumed_, Instruction());
reset_parsing();

67
InstructionSets/x86/Instruction.hpp
View File

@ -36,8 +36,6 @@ enum class Operation: uint8_t {
ADC,
/// Add; source, destination, operand and displacement will be populated appropriately.
ADD,
/// And; source, destination, operand and displacement will be populated appropriately.
AND,
/// Far call; see the segment() and offset() fields.
CALLF,
/// Displacement call; followed by a 16-bit operand providing a call offset.
@ -66,36 +64,83 @@ enum class Operation: uint8_t {
DAS,
/// Decrement; source, destination, operand and displacement will be populated appropriately.
DEC,
/// Increment; source, destination, operand and displacement will be populated appropriately.
INC,
/// Unsigned divide; divide the source value by AX or AL, storing the quotient in AL and the remainder in AH.
DIV,
/// Signed divide; divide the source value by AX or AL, storing the quotient in AL and the remainder in AH.
IDIV,
/// Escape, for a coprocessor; perform the bus cycles necessary to read the source and destination and perform a NOP.
ESC,
/// Stops the processor until the next interrupt is fired.
HLT,
/// Unsigned multiply; multiplies the source value by AX or AL, storing the result in DX:AX or AX.
MUL,
/// Signed multiply; multiplies the source value by AX or AL, storing the result in DX:AX or AX.
IMUL,
/// Reads from the port specified by source to the destination.
IN,
INC,
/// Writes from the port specified by destination from the source.
OUT,
/// Generates a software interrupt of the level stated in the operand.
INT,
/// Generates a software interrupt of level 3.
INT3,
/// Generates a software interrupt of level 4 if overflow is set.
INTO,
IRET,
// Various jumps; see the displacement to calculate targets.
JO, JNO, JB, JNB, JE, JNE, JBE, JNBE,
JS, JNS, JP, JNP, JL, JNL, JLE, JNLE,
/// Near jump; if an operand is not ::None then it gives an absolute destination; otherwise see the displacement.
JMPN,
/// Far jump to the indicated segment and offset.
JMPF,
JCXZ,
LAHF, LDS, LEA,
LODS, LOOPE, LOOPNE, MOV, MOVS, MUL, NEG, NOP, NOT, OR, OUT,
POP, POPF, PUSH, PUSHF, RCL, RCR, REP, ROL, ROR, SAHF,
SAR, SBB, SCAS, SAL, SHR, STC, STD, STI, STOS, SUB, TEST,
WAIT, XCHG, XLAT, XOR,
LES, LOOP, JPCX,
/// Relative jump performed only if CX = 0; see the displacement.
JPCX,
/// Load status flags to AH.
LAHF,
/// Load status flags from AH.
SAHF,
/// Load a segment and offset from the source into DS and the destination.
LDS,
/// Computes the effective address of the source and loads it into the destination.
LEA,
/// Load string; reads from DS:SI into AL or AX, subject to segment override.
LODS,
/// Move string; moves a byte or word from DS:SI to ES:DI. If a segment override is provided, it overrides the the source.
MOVS,
// Perform a possibly-conditional loop, decrementing CX. See the displacement.
LOOP, LOOPE, LOOPNE,
/// Loads the destination with the source.
MOV,
/// Negatives; source and destination point to the same thing, to negative.
NEG,
/// Logical NOT; source and destination point to the same thing, to negative.
NOT,
/// Logical AND; source, destination, operand and displacement will be populated appropriately.
AND,
/// Logical OR of source onto destination.
OR,
/// Logical XOR of source onto destination.
XOR,
/// NOP; no further fields.
NOP,
POP, POPF, PUSH, PUSHF, RCL, RCR, REP,
ROL, ROR,
SAR, SBB, SCAS, SAL, SHR, STC, STD, STI, STOS, SUB, TEST,
WAIT, XCHG, XLAT,
LES,
/// Return from interrupt.
IRET,
/// Near return; if source is not ::None then it will be an ::Immediate indicating how many additional bytes to remove from the stack.
RETF,
/// Far return; if source is not ::None then it will be an ::Immediate indicating how many additional bytes to remove from the stack.
RETN,
};