RFR: JDK-8305782: Provide MacroAssembler::breakpoint on aarch64 [v2]

[Thomas Stuefe]

On Sun, 30 Apr 2023 11:54:37 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

> The best way is like this:
> 
> ```
> address poo;
> 
> void stuff() {
>   ... instructions ...
>   poo = pc();
>   ... instructions ...
> }
> ```
> 
> then, in gdb:
> 
> ```
> (gdb) b <somewhere after startup>
> breakpoint 2 at 0xabcedf
> (gdb) comm 2
> Type commands for breakpoint(s) 2, one per line.
> End with a line saying just "end".
> >b *poo
> >c 
> >end
> (gdb)
> ```
> 
> Now, every time you run the program, a breakpoint will be set at `*poo`. And you can continue after the breakpoint.

Thanks, Andrew, that is helpful. I use breakpoint mostly in cases where I have a utility function that gets emitted multiple times, and I don't care which instance I debug, I'm fine with the first one that hits break.

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PR Comment: https://git.openjdk.org/jdk/pull/13401#issuecomment-1531104977