CVS commit: src/external/gpl3/gdb/dist/gdb

["Kamil Rytarowski" <kamil%netbsd.org@localhost>]

Module Name:    src
Committed By:   kamil
Date:           Fri May  3 07:05:28 UTC 2019

Modified Files:
        src/external/gpl3/gdb/dist/gdb: infrun.c nbsd-nat.c

Log Message:
Quick clean up the NetBSD support in GDB

Changes:

 - always perform polling on inferior_ptid, never -1
   -1 can cause catching fork/vfork events in random order
   polling on pid will guarantee to report events in expected order

 - assume availability of KERN_PROC_PATHNAME

 - drop dead code for KERN_PROC_AUXV (FreeBSD-specific sysctl)
   AUXV on NetBSD is handled with PIOD_READ_AUXV

 - drop unused nbsd_fetch_kinfo_proc

 - drop unneeded hacks for fork/vfork code

 - drop support for FreeBSD specific flags returned for PT_LWPINFO
   NetBSD uses PT_GET_SIGINFO / PT_GET_PROCESS_STATE for most pieces of
   information

 - port nbsd_thread_name to NetBSD

 - enable LWP and FORK events in nbsd_enable_proc_events

 - use NetBSD new batteries for distinguishing event type in to_wait
   map most events into GDB types
   breakpoint, single step, hw breakpoint/watchpoint ones are still not
   used with the full power here

 - add support for EXEC events

 - clean up

This change makes GDB functional with threaded code and it is good enough
to pass t_regress / threads test.

It's possible to execute and step processes with multiple threads, use
scheduler-lock, follow-fork etc features.

What does not work:

 - the LWP EXIT event and wait() are not synchronized and can deadlock
   this has been observed with exiting go applications

 - GDB VFORK code is still disabled and awaits kernel fixing

Short term goal is to correct LWP EXIT and follow up with VFORK fixes.

Long term goal is to rewrite NetBSD GDB support and write new support in
the remote process plugin (gdb-server) framework.

PR kern/53120
PR port-arm/51677
PR bin/54060
PR bin/49662
PR kern/52548


To generate a diff of this commit:
cvs rdiff -u -r1.1.1.7 -r1.2 src/external/gpl3/gdb/dist/gdb/infrun.c
cvs rdiff -u -r1.6 -r1.7 src/external/gpl3/gdb/dist/gdb/nbsd-nat.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.