Re: [RFA] enable software single step on alpha-osf

[Joel Brobecker <brobecker at gnat dot com>]

Following Andrew's suggestion, here is a revised patch to provide
software single stepping on alpha-osf1, plus fix all the quirks that
appeared after the switch.

I know the alpha-osf1-tdep.c change is approved, but since I haven't
committed it yet, I am including it in this patch for completeness.

No regression on alpha-osf1 (SW single step enabled) and on x86-linux
(sw single step disabled):

2002-07-18  Joel Brobecker  <brobecker@gnat.com>

        * alpha-osf1-tdep.c (alpha_osf1_init_abi): Unfortunately,
        procfs appears to be broken when debugging on multi-processor
        machines. So enable software single stepping in order to avoid
        using the procfs interface to do next/step operations, using
        internal breakpoints instead.

        * infrun.c (handle_inferior_event): Readjust the stop_pc by
        DECR_PC_AFTER_BREAK when hitting a single step breakpoint, to
        make this pc address equal to the value it would have if the
        system stepping capability was used. Also set a new flag used
        to ensure that we don't readjust the PC one more time later.

        * breakpoint.c (bpstat_stop_status): Do not adjust the PC
        address by DECR_PC_AFTER_BREAK when software single step is
        in use for this architecture, as this has already been taken
        care of in handle_inferior_event().

-- 
Joel

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