From: Michael Snyder <Michael.Snyder@palmsource.com>
To: s88 <dave.tw@gmail.com>
Cc: gdb@sourceware.org
Subject: Re: the breakpoint of gdb
Date: Fri, 13 Oct 2006 19:05:00 -0000 [thread overview]
Message-ID: <1160766220.14535.259.camel@localhost.localdomain> (raw)
In-Reply-To: <c9d32f760610131053h329664ecudcd3c69485698aae@mail.gmail.com>
On Sat, 2006-10-14 at 01:53 +0800, s88 wrote:
> Hi all:
>
> Could anyone tell me something about how the gdb to achieve the the
> breakpoint function in different platform?
Thru a platform_specific method (function pointer) called
"target_insert_breakpoint". Each target or platform defines
this function as appropriate.
Look for "target_insert_breakpoint" in breakpoint.c and target.h,
then grep for "to_insert_breakpoint" in *.c.
> I heard the gdb's breakpoint implement on the X86 platform is by the
> instruction patch. It sounds interesting!! I want to know more
> details.
Yes, the most common method is to insert a trap instruction
(or similar) into memory. See function "memory_insert_breakpoint"
in mem-break.c. Again, each target platform has to define the
appropriate bit-pattern or instruction to be inserted.
> Any reference info, web page, books are welcome.
Hah. If you write that book, you will become famous. ;-)
next prev parent reply other threads:[~2006-10-13 19:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-13 17:53 s88
2006-10-13 19:05 ` Michael Snyder [this message]
2006-10-13 19:37 ` ramana.radhakrishnan
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