On Thu, Apr 05, 2018 at 04:09:16PM -0400, David Rivshin wrote:
> From: David Rivshin <drivs...@allworx.com>
> NUMREGBYTES (which is used as the size for gdb_regs) is incorrectly based
> on DBG_MAX_REG_NUM instead of GDB_MAX_REGS. DBG_MAX_REG_NUM is the number
> of total registers, while GDB_MAX_REGS is the number of 'unsigned longs'
> it takes to serialize those registers. Since FP registers require 3
> 'unsigned longs' each, DBG_MAX_REG_NUM is smaller than GDB_MAX_REGS.
> This causes GDB 8.0 give the following error on connect:
> "Truncated register 19 in remote 'g' packet"
> This also causes the register serialization/deserialization logic to
> overflow gdb_regs, overwriting whatever follows.
> Fixes: 834b2964b7ab ("kgdb,arm: fix register dump")
> Cc: <sta...@vger.kernel.org> # 2.6.37+
> Signed-off-by: David Rivshin <drivs...@allworx.com>
I pointed some trivial autotests at both gdb-7.12 and gdb-8.0. Results
look good to me!
Tested-by: Daniel Thompson <daniel.thomp...@linaro.org>
> arch/arm/include/asm/kgdb.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> diff --git a/arch/arm/include/asm/kgdb.h b/arch/arm/include/asm/kgdb.h
> index 3b73fdcf3627a..8de1100d10674 100644
> --- a/arch/arm/include/asm/kgdb.h
> +++ b/arch/arm/include/asm/kgdb.h
> @@ -77,7 +77,7 @@ extern int kgdb_fault_expected;
> #define KGDB_MAX_NO_CPUS 1
> #define BUFMAX 400
> -#define NUMREGBYTES (DBG_MAX_REG_NUM << 2)
> +#define NUMREGBYTES (GDB_MAX_REGS << 2)
> #define NUMCRITREGBYTES (32 << 2)
> #define _R0 0
> base-commit: 0adb32858b0bddf4ada5f364a84ed60b196dbcda