diff options
Diffstat (limited to 'src/arch/x86/isa/bitfields.isa')
-rw-r--r-- | src/arch/x86/isa/bitfields.isa | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/src/arch/x86/isa/bitfields.isa b/src/arch/x86/isa/bitfields.isa index 47aec4fa1..fff324caa 100644 --- a/src/arch/x86/isa/bitfields.isa +++ b/src/arch/x86/isa/bitfields.isa @@ -58,5 +58,30 @@ // Bitfield definitions. // -def bitfield EXAMPLE <24>; +//Prefixes +def bitfield REX rex; +def bitfield LEGACY legacy; +// Pieces of the opcode +def bitfield OPCODE_NUM opcode.num; +def bitfield OPCODE_PREFIXA opcode.prefixA; +def bitfield OPCODE_PREFIXB opcode.prefixB; +def bitfield OPCODE_OP opcode.op; +//The top 5 bits of the opcode tend to split the instructions into groups +def bitfield OPCODE_OP_TOP5 opcode.op.top5; +def bitfield OPCODE_OP_BOTTOM3 opcode.op.bottom3; + +// Immediate fields +def bitfield IMMEDIATE immediate; +def bitfield DISPLACEMENT displacement; + +//Modifier bytes +def bitfield MODRM modRM; +def bitfield MODRM_MOD modRM.mod; +def bitfield MODRM_REG modRM.reg; +def bitfield MODRM_RM modRM.rm; + +def bitfield SIB sib; +def bitfield SIB_SCALE sib.scale; +def bitfield SIB_INDEX sib.index; +def bitfield SIB_BASE sib.base; |