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# Longjmp Support

GDB has support for figuring out that the target is doing a `longjmp` and for stopping at the target of the jump, if we are stepping. This is done with a few specialized internal breakpoints, which are visible in the `maint info breakpoint` command.

To make this work, you need to define a macro called `GET_LONGJMP_TARGET`, which will examine the `jmp_buf` structure and extract the longjmp target address. Since `jmp_buf` is target specific, you will need to define it in the appropriate ``tm-xxx.h'` file. Look in ``tm-sun4os4.h'` and ``sparc-tdep.c'` for examples of how to do this.

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