linux-stable.git/arch/microblaze/kernel/entry.S, branch linux-2.6.36.y

microblaze: Add KGDB support

2010-08-04T08:45:17+00:00

Kgdb uses brki r16, 0x18 instruction to call
low level _debug_exception function which save
current state to pt_regs and call microblaze_kgdb_break
function. _debug_exception should be called only from
the kernel space. User space calling is not supported
because user application debugging uses different handling.

pt_regs_to_gdb_regs loads additional special registers
which can't be changed

 * Enable KGDB in Kconfig
 * Remove ancient not-tested KGDB support
 * Remove ancient _debug_exception code from entry.S

Only MMU KGDB support is supported.

Signed-off-by: Michal Simek 
CC: Jason Wessel 
CC: John Williams 
CC: Edgar E. Iglesias 
CC: linux-kernel@vger.kernel.org
Acked-by: Jason Wessel

microblaze: Support brki rX, 0x18 for user application debugging

2010-08-04T08:45:16+00:00

This is the first patch which add support for
user application debugging through brki rX, 0x18 vector.

This patch has side effect which also remove security issue
to use brki rX, 0x18 to freeze kernel.

Support for old gdb support via priviledged exception
(brk r0, r0) is still there. It will be remove in future.

Signed-off-by: Michal Simek

microblaze: Remove nop after MSRCLR/SET, MTS, MFS instructions

2010-08-04T08:45:16+00:00

We need to save instruction and the latest Microblaze shouldn't
have any problem with it.

Signed-off-by: Michal Simek

microblaze: Simplify syscall rutine

2010-08-04T08:45:15+00:00

Syscall can be called only from userspace that's why
we don't need to check which space kernel come from.

Kernel syscall calling is not check and shouldn't come
throught this part of code.

Signed-off-by: Michal Simek

microblaze: Move PT_MODE saving to delay slot

2010-08-04T08:45:14+00:00

We can save one more instruction if PT_MODE is saved in delay slot

Signed-off-by: Michal Simek

microblaze: Fix _interrupt function

2010-08-04T08:45:13+00:00

Save instructions by using delay slot and
clear UMS only if kernel comes from user space.

Signed-off-by: Michal Simek

microblaze: Fix _user_exception function

2010-08-04T08:45:12+00:00

Saving some instructions. Clear VMS bit if kernel comes
from kernel space.

Signed-off-by: Michal Simek

microblaze: Put together addik instructions

2010-08-04T08:44:56+00:00

Saving instructions by adding 2/3 addik instructions to one.

Signed-off-by: Michal Simek

microblaze: Use delay slot in syscall macros

2010-08-04T08:32:22+00:00

Saving instruction with delay slot usage.

Signed-off-by: Michal Simek

microblaze: Save kernel mode in delay slot

2010-08-04T08:32:21+00:00

This change save one instruction if kernel comes from kernel
space.

Signed-off-by: Michal Simek