[lldb-dev] Shared Process plugin between Linux and BSD

[Kamil Rytarowski via lldb-dev]

Hello,

I've prepared two patches to make the Linux Process Plugin buildable on
NetBSD.

The diff will help to transform the Linux process plugin to common code,
shared between Linux and BSDs (FreeBSD, NetBSD).

lldb-git: Enable Linux Process plugin on NetBSD

https://wip.pkgsrc.org/cgi-bin/gitweb.cgi?p=pkgsrc-wip.git;a=commitdiff;h=4b00674e876ebfe427743759de13ead420112fd4

lldb-git: Disable unbuildable code-fragments in the
LinuxProcessPlugin/NetBSD

https://wip.pkgsrc.org/cgi-bin/gitweb.cgi?p=pkgsrc-wip.git;a=commitdiff;h=e1ef012c16ab7729918ae367150b13bf0d77650b

Comments to the disabled code:

1. Thread resume/suspend operation - to be implemented on NetBSD with
ptrace(2).

2. PTRACE_SETSIGINFO - equivalent currently unsupported, I will need to
add support for it in ptrace(2).

3. PTRACE_O_TRACEEXEC, PTRACE_O_TRACECLONE, PTRACE_O_TRACEEXIT -
equivalent to be implemented.

4. No tracing of VFORK events implemented.

5. Hardware assisted watchpoints (debug registers on amd64) have their
dedicated ptrace(2) API to set/unset watchpoints, they do not export raw
debug registers.

6. Other ptrace(2) calls have their equivalents on NetBSD
(PTRACE_PEEKUSER, PTRACE_POKEUSER etc).

7. SIGTRAP has currently only two si_code values (specified by POSIX).

8. No SI_TKILL available.

9. There is no process_vm_readv/process_vm_writev call available.

10. __WALL and __WNOTHREAD are Linux specific, but they have their
counterparts.

11. The cpu_set_t structure and appropriate functions have similar
counterparts on NetBSD.

12. No <sys/procfs.h> and no dependency of procfs (/proc) is acceptable,
everything shall be accessible through ptrace(2) and sysctl(7).

13. personality.h - unsupported as header/function call, compatibility
with other OSes (mostly Linux) implemented on syscall level.

14. Process, system thread (lwp) and POSIX (pthread_t) thread are not
the same on NetBSD, unlike some other systems and cannot be mixed.


The currently missing features on the NetBSD side don't stop us from
making a functional implementation, lacing interfaces might be added
after getting the core part to work.

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