llvm-project.git/lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64dbreg.cpp, branch main Unnamed repository; edit this file 'description' to name the repository. [lldb][AArch64] Fix arm64 hardware breakpoint/watchpoint to arm32 process. (#147198) 2025-07-29T09:05:13+00:00 b10902118 b10902118@ntu.edu.tw 2025-07-29T09:05:13+00:00 9bf3e615a2c6db6e2a00ee2004ebcb21daf1334b When debugging arm32 process on arm64 machine, arm64 lldb-server will use `NativeRegisterContextLinux_arm`, but the server should keep using 64-bit ptrace commands for hardware watchpoint/breakpoint, even when debugging a 32-bit tracee. See: https://github.com/torvalds/linux/commit/5d220ff9420f8b1689805ba2d938bedf9e0860a4 There have been many conditional compilation handling arm32 tracee on arm64, but this one is missed out. To reuse the 64-bit implementation, I separate the shared code from `NativeRegisterContextLinux_arm64.cpp` to `NativeRegisterContextLinux_arm64dbreg.cpp`, with other adjustments to share data structures of debug registers. 
When debugging arm32 process on arm64 machine, arm64 lldb-server will
use `NativeRegisterContextLinux_arm`, but the server should keep using
64-bit ptrace commands for hardware watchpoint/breakpoint, even when
debugging a 32-bit tracee.

See:
https://github.com/torvalds/linux/commit/5d220ff9420f8b1689805ba2d938bedf9e0860a4

There have been many conditional compilation handling arm32 tracee on
arm64, but this one is missed out.

To reuse the 64-bit implementation, I separate the shared code from
`NativeRegisterContextLinux_arm64.cpp` to
`NativeRegisterContextLinux_arm64dbreg.cpp`, with other adjustments to
share data structures of debug registers.