This is a collection of Intel®’ IA32® Software Developer's Manuals (URL of the day) and AMD' AMD64 Architecture Programmer's Manual together with the related specifications, application notes, white papers, and change logs. The collection aims to keep all available revisions. It was originally created by Michal Necasek, see OS/2 Museum.

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BKPT

Breakpoint causes a Breakpoint Instruction exception.

Breakpoint is always unconditional, even when inside an IT block.

It has encodings from the following instruction sets: A32 ( A1 ) and T32 ( T1 ) .

A1

Decode for this encoding

let imm16 : bits(16) = imm12::imm4; if cond != '1110' then UnpredictableProcedure(); end; // BKPT must be encoded with AL condition

CONSTRAINED UNPREDICTABLE behavior

If cond != '1110', then one of the following behaviors must occur:

• The instruction is undefined.
• The instruction executes as NOP.
• The instruction executes unconditionally.
• The instruction executes conditionally.

T1

Decode for this encoding

let imm16 : bits(16) = ZeroExtend{}(imm8);

Assembler Symbols