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INT1

Generates a breakpoint exception (INT 1), which triggers a software interrupt.

The table after the description covers what the source and destinations can be.

DO NOT support LOCK

This instruction is available in 64-bit mode, compatibility mode, and 32-bit mode. It does not have architectural constraints regarding register usage as it takes no operands.

The INT 1 instruction is specifically used for hardware breakpoints and debugging. Users MUST be aware that if a debug exception handler is not properly configured in the IDT, this instruction WILL trigger a double fault. Additionally, while it behaves similarly to INT 3, INT 1 is typically used by the processor to signal a debug breakpoint; using it manually in code can interfere with hardware debugging tools.