FNSTENV
MEM0:w:mem14 REG0=XED_REG_X87STATUS:w:SUPP MEM0:w:mem14 REG0=XED_REG_X87STATUS:w:SUPP MEM0:w:mem14 REG0=XED_REG_X87STATUS:w:SUPP MEM0:w:mem28 REG0=XED_REG_X87STATUS:w:SUPP MEM0:w:mem28 REG0=XED_REG_X87STATUS:w:SUPP MEM0:w:mem28 REG0=XED_REG_X87STATUS:w:SUPP MEM0:w:mem28 REG0=XED_REG_X87STATUS:w:SUPP
x86_64 X86_LEGACY X87_ALU X87 source: xed
XED_FNSTENV_X86_LEGACY_ONEBYTE_D9_727279
Encoding
| encoding_kind | X86_LEGACY |
| opcode_bytes | D9 D9 D9 D9 D9 D9 D9 |
| opcode_map | ONEBYTE |
| mandatory_prefix | - |
| has_modrm | True |
| modrm.reg = /6 | /6 |
| rex_w | 1 |
| requires_mode | long |
| attributes | X87_NOWAIT X87_CONTROL NOTSX |
| cpl | 3 |
| raw_encoding | 0xD9 MOD[mm] MOD!=3 REG[0b110] RM[nnn] mode16 no66_prefix MODRM() 0xD9 MOD[mm] MOD!=3 REG[0b110] RM[nnn] mode32 66_prefix MODRM() 0xD9 MOD[mm] MOD!=3 REG[0b110] RM[nnn] mode64 norexw_prefix 66_prefix MODRM() 0xD9 MOD[mm] MOD!=3 REG[0b110] RM[nnn] mode16 66_prefix MODRM() 0xD9 MOD[mm] MOD!=3 REG[0b110] RM[nnn] mode32 no66_prefix MODRM() 0xD9 MOD[mm] MOD!=3 REG[0b110] RM[nnn] mode64 rexw_prefix MODRM() 0xD9 MOD[mm] MOD!=3 REG[0b110] RM[nnn] mode64 norexw_prefix no66_prefix MODRM() |
Operands (14)
| # | Role | Kind | Class / Reg | Width | Access | Visibility | Encoded in |
|---|---|---|---|---|---|---|---|
| 0 | MEM0 | MEM | w | W | EXPLICIT | MODRM_RM | |
| 1 | REG0 | REG | w | W | SUPPRESSED | MODRM_REG | |
| 2 | MEM1 | MEM | w | W | EXPLICIT | MODRM_RM | |
| 3 | REG1 | REG | w | W | SUPPRESSED | MODRM_REG | |
| 4 | MEM2 | MEM | w | W | EXPLICIT | MODRM_RM | |
| 5 | REG2 | REG | w | W | SUPPRESSED | MODRM_REG | |
| 6 | MEM3 | MEM | w | W | EXPLICIT | MODRM_RM | |
| 7 | REG3 | REG | w | W | SUPPRESSED | MODRM_REG | |
| 8 | MEM4 | MEM | w | W | EXPLICIT | MODRM_RM | |
| 9 | REG4 | REG | w | W | SUPPRESSED | MODRM_REG | |
| 10 | MEM5 | MEM | w | W | EXPLICIT | MODRM_RM | |
| 11 | REG5 | REG | w | W | SUPPRESSED | MODRM_REG | |
| 12 | MEM6 | MEM | w | W | EXPLICIT | MODRM_RM | |
| 13 | REG6 | 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.