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Date: Sat, 11 Jun 2005 23:31:00 -0000
Message-Id: <200506112331.j5BNVc4L020335@elgar.sibelius.xs4all.nl>
From: Mark Kettenis <mark.kettenis@xs4all.nl>
To: drow@false.org
CC: tronics93-gdb@yahoo.com, gdb@sources.redhat.com
In-reply-to: <20050601132331.GA19300@nevyn.them.org> (message from Daniel
	Jacobowitz on Wed, 1 Jun 2005 09:23:31 -0400)
Subject: Re: gdb 6.3 misses breakpoint on Linux when inferior does clone()
References: <20050531170523.45257.qmail@web31913.mail.mud.yahoo.com> <20050601132331.GA19300@nevyn.them.org>
X-SW-Source: 2005-06/txt/msg00106.txt.bz2

   Date: Wed, 1 Jun 2005 09:23:31 -0400
   From: Daniel Jacobowitz <drow@false.org>

   On Tue, May 31, 2005 at 10:05:22AM -0700, tronics93-gdb@yahoo.com wrote:
   > The following code snippet gets the flags passed in to clone() (on
   > x86):
   > 
   >    unsigned long regs[FRAME_SIZE];
   > 
   >    if (ptrace(PTRACE_GETREGS, pid, 0, &regs) < 0)
   >         perror("ptrace_getregs failed:");
   > 
   >    printf("syscall=%d, arg1=%#x, arg2=%#x\n", regs[ORIG_EAX], 
   >                               regs[EBX], regs[ECX]);

   Only if you're stopped at the clone.  Hmm.  Good point; perhaps we can
   recover them from registers when we receive the clone event.

But having to do that in a machine-dependent manner really sucks...

   It could probably be implemented if someone spent the time.

...so that time is probably better spent on implementing the proper
machine-independent functionality in the Linux kernel!

Mark