arch: arm64: add GDB stub support - #117408
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AArch64 previously lacked CONFIG_GDBSTUB / ARCH_HAS_GDBSTUB, so the common debug/gdbstub subsystem could not be used on Cortex-A. Add the architecture bits: register g/G packet layout matching GDB aarch64-tdep, exception entry from BRK and debug exceptions in switch.S (including GPRs not saved in arch_esf), and hardware breakpoints via DBGBVR/DBGBCR because W^X text cannot be patched for software breakpoints. Raise GDBSTUB_BUF_SZ for the larger g-packet. Signed-off-by: Yuan Bian <bianyuan@kylinos.cn>
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AArch64 previously lacked CONFIG_GDBSTUB / ARCH_HAS_GDBSTUB, so the common debug/gdbstub subsystem could not be used on Cortex-A.
Add the architecture bits: register g/G packet layout matching GDB aarch64-tdep, exception entry from BRK and debug exceptions in switch.S (including GPRs not saved in arch_esf), and hardware breakpoints via DBGBVR/DBGBCR because W^X text cannot be patched for software breakpoints. Raise GDBSTUB_BUF_SZ for the larger g-packet.