WRFSBASE
REG0=GPRy_B():r REG1=XED_REG_FSBASE:w:SUPP:y
x86_64 X86_LEGACY RDWRFSGS RDWRFSGS source: xed
XED_WRFSBASE_X86_LEGACY_0F_AE_346284
Encoding
| encoding_kind | X86_LEGACY |
| opcode_bytes | AE |
| opcode_map | 0F |
| mandatory_prefix | - |
| has_modrm | True |
| modrm.reg = /2 | /2 |
| requires_mode | long |
| attributes | NOTSX |
| cpl | 3 |
| raw_encoding | 0x0F 0xAE MOD[0b11] MOD=3 REG[0b010] RM[nnn] mode64 f3_refining_prefix |
Operands (2)
| # | Role | Kind | Class / Reg | Width | Access | Visibility | Encoded in |
|---|---|---|---|---|---|---|---|
| 0 | REG0 | REG | R | EXPLICIT | MODRM_REG | ||
| 1 | REG1 | REG | w | W | SUPPRESSED | MODRM_REG |
Micro-ops sequence (0)
No micro-ops authored for this encoding. Emulator semantics not yet defined — decoder still works.