From: Vijaya Kumar K Vijaya.Kumar@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
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
Tested with Aarch64 GDB tool chain on simulator
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 | 67 +++++++ 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 | 325 +++++++++++++++++++++++++++++++ kernel/debug/debug_core.c | 2 +- 7 files changed, 567 insertions(+), 2 deletions(-) create mode 100644 arch/arm64/include/asm/kgdb.h create mode 100644 arch/arm64/kernel/kgdb.c