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SubjectRE: [PATCH 09/37] kgdb,blackfin: Add in kgdb_arch_set_pc for blackfin
Date
A little update.

GDB uses field BFIN_PC as the resume address from debugging mode. But, field pc in struct pt_regs is where kernel resumes from an interrupt. So, BFIN_PC is actually retx when do kernel debugging.


Sonic


--- trunk/arch/blackfin/kernel/kgdb.c 2009-12-28 09:27:27 UTC (rev 8085)
+++ trunk/arch/blackfin/kernel/kgdb.c 2009-12-28 10:08:30 UTC (rev 8086)
@@ -79,7 +79,7 @@
gdb_regs[BFIN_RETX] = regs->retx;
gdb_regs[BFIN_RETN] = regs->retn;
gdb_regs[BFIN_RETE] = regs->rete;
- gdb_regs[BFIN_PC] = regs->pc;
+ gdb_regs[BFIN_PC] = regs->retx;
gdb_regs[BFIN_CC] = 0;
gdb_regs[BFIN_EXTRA1] = 0;
gdb_regs[BFIN_EXTRA2] = 0;
@@ -150,7 +150,7 @@
regs->retx = gdb_regs[BFIN_PC];
regs->retn = gdb_regs[BFIN_RETN];
regs->rete = gdb_regs[BFIN_RETE];
- regs->pc = gdb_regs[BFIN_PC];
+ regs->pc = gdb_regs[BFIN_RETI];

#if 0 /* can't change these */
regs->astat = gdb_regs[BFIN_ASTAT];



-----Original Message-----
From: Mike Frysinger [mailto:vapier.adi@gmail.com]
Sent: Sunday, December 27, 2009 5:12 AM
To: Jason Wessel
Cc: linux-kernel@vger.kernel.org; kgdb-bugreport@lists.sourceforge.net; kdb@oss.sgi.com; mingo@elte.hu; Zhang, Sonic
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@gentoo.org>
> Signed-off-by: Jason Wessel <jason.wessel@windriver.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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