linux-kernel - Re: [PATCH 09/37] kgdb,blackfin: Add in kgdb_arch_set

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Message-ID: <8bd0f97a0912261312x4b7c7df6s14ac0137b702044e@mail.gmail.com>
Date:	Sat, 26 Dec 2009 16:12:13 -0500
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Jason Wessel <jason.wessel@...driver.com>
Cc:	linux-kernel@...r.kernel.org, kgdb-bugreport@...ts.sourceforge.net,
	kdb@....sgi.com, mingo@...e.hu,
	Sonic Zhang <Sonic.Zhang@...log.com>
Subject: Re: [PATCH 09/37] kgdb,blackfin: Add in kgdb_arch_set_pc for blackfin

On Wed, Dec 23, 2009 at 16:19, Jason Wessel wrote:
> The new debug core api requires all architectures that use to debug
> core to implement a function to set the program counter.
>
> CC: Mike Frysinger <vapier@...too.org>
> Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
> ---
>  arch/blackfin/kernel/kgdb.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/arch/blackfin/kernel/kgdb.c b/arch/blackfin/kernel/kgdb.c
> index f1036b6..5965188 100644
> --- a/arch/blackfin/kernel/kgdb.c
> +++ b/arch/blackfin/kernel/kgdb.c
> @@ -644,6 +644,11 @@ int kgdb_arch_remove_breakpoint(unsigned long addr, char *bundle)
>        return bfin_probe_kernel_write((char *)addr, bundle, BREAK_INSTR_SIZE);
>  }
>
> +void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
> +{
> +       regs->retx = ip;
> +}
> +
>  int kgdb_arch_init(void)
>  {
>        kgdb_single_step = 0;

Sonic should be able to check this.  our pc handling seems a little wonky atm:

arch/blackfin/kernel/kgdb.c:
void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
...
    gdb_regs[BFIN_RETI] = regs->pc;
    gdb_regs[BFIN_RETX] = regs->retx;
    gdb_regs[BFIN_PC] = regs->pc;
...
}
...
void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
{
...
    regs->pc = gdb_regs[BFIN_PC];
    regs->retx = gdb_regs[BFIN_PC];
    /* nothing for BFIN_RETI */
...
}
-mike
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