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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
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