From: Vijaya Kumar K <Vijaya.Kumar(a)caviumnetworks.com>
Based on the step-handler and break-handler hooks patch from
Sandeepa (Patch 1), KGDB debugging support is added for EL1
debug in AArch64 mode. Any updates that come for Patch 1 from
Sandeepa will be rebased in next version
With second patch,register layout is updated to be inline with GDB tool.
Basic GDB connection, break point set/clear and info commands
are supported except step/next debugging
With third patch, step/next debugging support is added, where in
pc is updated to point to the instruction to be stepped and
stopped.
With fourth patch, the compile time breakpoint instruction
reordering is fixed by making kgbd_breakpoint() as noinline
Tested with ARM64 simulator
v5:
- Updated BRK #imm16 value to 0x400 & 0x401 as per recommendation
as per Marcus recommendataion
http://patchwork.ozlabs.org/patch/290801/
- Rebased to 3.13 AArch64 kernel
v4:
- Updated kgdb_single_step and kgdb_cpu_doing_single_step
variables properly based on gdb state
v3:
- Rebased to v4 version of Sandeepa Prabhu's patch (patch 1)
- Made dynamic break point instruction encoding generic
- Made ESR value encoding generic for dynamic and compile break point
- Used memcpy and memset to copy register contents to gdb buffer
- Fixed reordering of break point instruction by compiler with
patch 3
- Rebased against AAach64 upstream kernel
v2:
- Moved break instruction encoding to debug-monitors.h file
- Fixed endianess of compile break instruction encoding
- Updated I/O buffer sizes
- Updated register buffer size
- Remove changes to debug_exception handler in entry.S for
- ELR update and step debugging with update pc instead of ELR
- Rebased against AArch64 upstream kernel
v1:
- Initial patch-set
Sandeepa Prabhu (1):
arm64: support single-step and breakpoint handler hooks
Vijaya Kumar K (3):
AArch64: KGDB: Add Basic KGDB support
AArch64: KGDB: Add step debugging support
KGDB: make kgdb_breakpoint() as noinline
arch/arm64/include/asm/debug-monitors.h | 68 +++++++
arch/arm64/include/asm/kgdb.h | 86 ++++++++
arch/arm64/kernel/Makefile | 1 +
arch/arm64/kernel/debug-monitors.c | 86 +++++++-
arch/arm64/kernel/entry.S | 2 +
arch/arm64/kernel/kgdb.c | 338 +++++++++++++++++++++++++++++++
kernel/debug/debug_core.c | 2 +-
7 files changed, 581 insertions(+), 2 deletions(-)
create mode 100644 arch/arm64/include/asm/kgdb.h
create mode 100644 arch/arm64/kernel/kgdb.c
--
1.7.9.5
