URDMSR
REG0=GPR64_B():w:q:u64 REG1=GPR64_R():r:q:u64 REG2=XED_REG_MSRS:r:SUPP
x86_64 X86_LEGACY APX APX_F_USER_MSR source: xed
XED_URDMSR_GPR64u64_GPR64u64_APX
Encoding
| encoding_kind | X86_LEGACY |
| opcode_bytes | F8 |
| opcode_map | ONEBYTE |
| mandatory_prefix | - |
| has_modrm | True |
| vex_l | 0 |
| requires_mode | long |
| attributes | NOTSX |
| exception_class | USER-MSR-EVEX |
| cpl | 3 |
| raw_encoding | EVV 0xF8 VF2 MAP4 MOD[0b11] MOD=3 UBIT=1 REG[rrr] RM[nnn] ND=0 NF=0 W0 VL128 mode64 NOEVSR ZEROING=0 EVAPX() |
Operands (3)
| # | Role | Kind | Class / Reg | Width | Access | Visibility | Encoded in |
|---|---|---|---|---|---|---|---|
| 0 | REG0 | REG | w | W | EXPLICIT | MODRM_REG | |
| 1 | REG1 | REG | q | R | EXPLICIT | MODRM_REG | |
| 2 | REG2 | REG | R | SUPPRESSED | MODRM_REG |
Micro-ops sequence (0)
No micro-ops authored for this encoding. Emulator semantics not yet defined — decoder still works.