From: Vijaya Kumar K Vijaya.Kumar@caviumnetworks.com
Based on ARM64 KGDB support patches, KGDB support for FPSIMD is added. Only debugging of FPSIMD is kernel context is supported.
This patch also requires Ard's patches where in kernel support for NEON is added. So CONFIG_KERNEL_MODE_NEON should be enabled. with this, FPSIMD registers can be viewed or set from gdb tool.
Unlike CPU registers, the FPSIMD registers are not saved on exception entry. With the known restriction that FPSIMD should not be touched in interrupt/exception context, in this patch the FPSIMD registers are directly read/written on gdb tool request
Here, the FPSIMD registers are read and restored for every FPSIMD register read and write by GDB tool. So this has impact on gdb tool response which is neglible. Other architectures like mips are also implemented similarly
Tested on ARM64 simulator
Vijaya Kumar K (1): ARM64: KGDB: Add FP/SIMD debug support
arch/arm64/kernel/kgdb.c | 98 ++++++++++++++++++++++++++++------------------ 1 file changed, 60 insertions(+), 38 deletions(-)