Re: [ECOS] Gdb 6.7, gcc 4.2.2, redboot on arm (gba), "target remote" doesn't work.

[Gary Thomas <gary at mlbassoc dot com>]

Andrew Lunn wrote:
> On Fri, Jan 18, 2008 at 07:39:28PM +0100, Paul Chavent wrote:
> > Hello.
> >
> > I have found that it fails in hal/arm/arch/current/src/hal_misc.c at void breakpoint(void).
> >
> > When i execute
> > void
> > breakpoint(void)
> > {
> >   diag_printf("breakpoint\n");
> >     HAL_BREAKPOINT(_breakinst);
> >   diag_printf("breakpoint\n");
> > }
> > The second trace doesn't appear and the target reboot.
> >
> > When i try to compile
> > void
> > breakpoint(void)
> > {
> >   diag_printf("breakpoint %p\n", _breakinst);
> >     HAL_BREAKPOINT(_breakinst);
> >   diag_printf("breakpoint %p\n", _breakinst);
> > }
> > I have hal_misc.c:230: error: `_breakinst' undeclared (first use in this function)
>
> The magic for this is in:
>
> /packages/hal/arm/arch/current/include/hal_arch.h
>
> I don't remember who this works on ARM. Maybe it uses a Software
> interrupt?

IIRC, it uses an officially sanctioned illegal instruction.

--
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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