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ENDBR32

Terminate an Indirect Branch in 32-bit and Compatibility Mode

stableVMJITAOTinstruction

Encodings

OpcodeInstructionOp/En64-bitCompat/LegacyDescription
F3 0F 1E FBENDBR32ZOValidValidTerminate indirect branch in 32-bit and compatibility mode.

Measured cost

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Description

Terminate an indirect branch in 32 bit and compatibility mode. This opcode is a NOP when CET indirect branch tracking is not enabled and on processors that do not support CET.

Operation

IF EndbranchEnabled(CPL) & (IA32_EFER.LMA = 0 | (IA32_EFER.LMA=1 & CS.L = 0)
    IF CPL = 3
          THEN
                IA32_U_CET.TRACKER = IDLE
                IA32_U_CET.SUPPRESS = 0
          ELSE
                IA32_S_CET.TRACKER = IDLE
                IA32_S_CET.SUPPRESS = 0
    FI;

FI;

Flags affected

None.

Exceptions If the LOCK prefix is used.

#UD

Sources