SYSENTER
REG0=XED_REG_EIP:w:SUPP REG1=XED_REG_ESP:w:SUPP REG0=XED_REG_RIP:w:SUPP REG1=XED_REG_RSP:w:SUPP
x86_64 X86_LEGACY SYSCALL SEP source: xed
XED_SYSENTER_X86_LEGACY_0F_34_389003
Encoding
| encoding_kind | X86_LEGACY |
| opcode_bytes | 34 0F 34 |
| opcode_map | 0F |
| mandatory_prefix | - |
| has_modrm | False |
| requires_mode | long |
| attributes | PROTECTED_MODE NOTSX |
| cpl | 3 |
| raw_encoding | 0x0F 0x34 not64 0x0F 0x34 mode64 norex2_prefix |
Operands (4)
| # | Role | Kind | Class / Reg | Width | Access | Visibility | Encoded in |
|---|---|---|---|---|---|---|---|
| 0 | REG0 | REG | (=EIP) | w | W | SUPPRESSED | MODRM_REG |
| 1 | REG1 | REG | (=ESP) | w | W | SUPPRESSED | MODRM_REG |
| 2 | REG2 | REG | (=RIP) | w | W | SUPPRESSED | MODRM_REG |
| 3 | REG3 | REG | (=RSP) | w | W | SUPPRESSED | MODRM_REG |
Flag effects (1)
IF = SET_0
Micro-ops sequence (0)
No micro-ops authored for this encoding. Emulator semantics not yet defined — decoder still works.