The opcode supplies the instruction details to the processor, and the operand provides the necessary data. An operand might contain the data or an address for where the data can be found, such as a location in a register or in system memory. The exact approach to handling opcodes and ...
Some operands don't have all of their bits next to each other and instead have some of them at one position and the rest on another. My favourite example is theencoding T1 of mov registerwhich has one bit of the destination register operand (Rd) at position 7 while the other 3 are at...
The first byte of the machine code represents the instruction’s opcode. An opcode is simply a fixed number corresponding to a specific form of an instruction. Different forms of an instruction, such as one form that operates on a register operand and one form that operates on an immediate ...
LaneBitmask DefinedLanes)const{constMachineInstr &MI = *Def.getParent();// Translate DefinedLanes if necessary.switch(MI.getOpcode()) {caseTargetOpcode::REG_SEQUENCE: {unsignedSubIdx = MI.getOperand(OpNum +1).getImm();
MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].imm = val;#ifndefCAPSTONE_DIETget_op_access(MI->csh, MCInst_getOpcode(MI), access, &MI->flat_insn->detail->x86.eflags); MI->flat_insn->detail->x86.operands[MI->flat_insn->detail->x86.op_count].acces...
A repeat instruction (RPT) operates on one or more operands, but the RPT instruction includes only an opcode and does not specify locations of the operand or operands. The type of operation to be performed when the RPT instruction is executed depends upon an initial instruction. If, for exam...
The Java Virtual Machine uses the operand stack as a work space. Many instructions pop values from the operand stack, operate on them, and push the result. For example, the iadd instruction adds two integers by popping two ints off the top of the operand stack, adding them, and pushing...
Code Example 6.6 shows the add immediate instruction, addi, that adds an immediate to a register. In assembly code, the immediate can be written in decimal, hexadecimal, or binary. Hexadecimal constants in RISC-V assembly language start with 0x and binary constants start with 0b, as they do...
A repeat instruction (RPT) operates on one or more operands, but the RPT instruction includes only an opcode and does not specify locations of the operand or operands. The type of operation to be performed when the RPT instruction is executed depends upon an initial inst...
(for example, loading data from memory or the encoding of the instruction). Furthermore, an instruction being included on this list does not mean that its usage is resistant to power, thermal, or frequency-based side channels. Guidance to avoid these specific types of side...