From: John Baldwin <jhb@FreeBSD.org>
To: hilbert <swdtian@163.com>, gdb@sourceware.org
Subject: Re: Why are these two methods default_memory_insert_breakpoint() and default_memory_remove_breakpoint() called multiple times
Date: Wed, 31 May 2023 08:57:52 -0700 [thread overview]
Message-ID: <95c62feb-4189-64a8-c819-b5d0717b7734@FreeBSD.org> (raw)
In-Reply-To: <3141f115.df17.18871148f89.Coremail.swdtian@163.com>
On 5/31/23 2:12 AM, hilbert via Gdb wrote:
> Hi,
>
> I just inserted a breakpoint, shouldn't the two methods default_memory_insert_breakpoint() and default_memory_remove_breakpoint() be used only once?
>
> There is only one breakpoint, why both functions default_memory_insert_breakpoint() and default_memory_remove_breakpoint() are called before stopping and after stopping (after the continue command), why?
GDB inserts some of its own internal breakpoints. For example,
in the runtime linker/loader there is a special symbol GDB sets
a breakpoint on so it can be notified about shared libraries being
loaded or unloaded. If you are using libthread_db on a target it
may install internal breakpoints to detect thread creation and
thread exit as well.
--
John Baldwin
next prev parent reply other threads:[~2023-05-31 15:58 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-31 9:12 hilbert
2023-05-31 15:57 ` John Baldwin [this message]
2023-06-01 1:50 ` hilbert
2023-06-01 17:09 ` John Baldwin
2023-06-02 2:09 ` hilbert
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