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BTI

Branch Target Identification. A BTI instruction is used to guard against the execution of instructions which are not the intended target of a branch.

Outside of a guarded memory region, a BTI instruction executes as a NOP. Within a guarded memory region while PSTATE.BTYPE != 0b00, a BTI instruction compatible with the current value of PSTATE.BTYPE will not generate a Branch Target Exception and will allow execution of subsequent instructions within the memory region.

The operand <targets> passed to a BTI instruction determines the values of PSTATE.BTYPE which the BTI instruction is compatible with.

Within a guarded memory region, while PSTATE.BTYPE

!= 0b00, all instructions will generate a Branch Target

Exception, other than BRK, BTI, HLT, PACIASP,

and PACIBSP, which may not. See the individual instructions for details.

System
(Armv8.5)

313029282726252423222120191817161514131211109876543210
110101010000001100100100xx011111
CRmop2

BTI {<targets>}

SystemHintOp op;

if CRm:op2 == '0100 xx0' then
    op = SystemHintOp_BTI;
    // Check branch target compatibility between BTI instruction and PSTATE.BTYPE
    SetBTypeCompatible(BTypeCompatible_BTI(op2<2:1>));
else
    EndOfInstruction();

Assembler Symbols

<targets> Is the type of indirection, encoded in op2<2:1>:
op2<2:1> <targets>
00 (omitted)
01 c
10 j
11 jc