LLDB work concluded


April 04, 2020 posted by Michał Górny

Upstream describes LLDB as a next generation, high-performance debugger. It is built on top of LLVM/Clang toolchain, and features great integration with it. At the moment, it primarily supports debugging C, C++ and ObjC code, and there is interest in extending it to more languages.

In February 2019, I have started working on LLDB, as contracted by the NetBSD Foundation. So far I've been working on reenabling continuous integration, squashing bugs, improving NetBSD core file support, extending NetBSD's ptrace interface to cover more register types and fix compat32 issues, fixing watchpoint and threading support, porting to i386.

March 2020 was the last month of my contract. During it my primary focus was to prepare integration of LLDB into NetBSD's src tree.

[Read More] [0 comments]

 

The GNU GDB Debugger and NetBSD (Part 1)


April 02, 2020 posted by Kamil Rytarowski

The NetBSD team of developers maintains two copies of GDB:
  • One in the base-system with a stack of local patches.
  • One in pkgsrc with mostly build fix patches.

The process of maintaining a modern version (GPLv3) of GDB in basesystem is tainted with a constant extra cost. The NetBSD developers need to rebase the stack of local patches for the newer releases of the debugger and resurrect the support. The GDB project is under an active development and in active refactoring of the code, that was originally written in C, to C++.

Unfortunately we cannot abandon the local basesystem patches and rely on a pristine version as there is lack of feature parity in the pkgsrc version of GDB: no threading support, not operational support for most targets, no fork/vfork/etc events support, no auxv reading support on 64-bit kernels, no proper support of signals, single step etc.

Additionally there are extra GDB patches stored in pkgsrc-wip (created by me last year), that implement the gdbserver support for NetBSD/amd64. gdbserver is a GDB version that makes it possible to remotely debug other programs even across different Operating Systems and CPUs. This code has still not been merged into the mainline base-system version. This month, I have discovered that support needs to be reworked, as the preexisting source code directory hierarchy was rearranged.

Unless otherwise specified all the following changes were upstreamed to the mainstream GDB repository. According to the GDB schedule, the GDB10 branch point is planned on 2020-05-15 with release on 2020-06-05. It's a challenge to see how much the GDB support can be improved by then for NetBSD![Read More] [0 comments]

 

Extending support for the NetBSD-7 branch


April 02, 2020 posted by Maya Rashish

Typically, some time after releasing a new NetBSD major version (such as NetBSD 9.0), we will announce the end-of-life of the N-2 branch, in this case NetBSD-7.

We've decided to hold off on doing that to ensure our users don't feel rushed to perform a major version update on any remote machines, possibly needing to reach the machine if anything goes wrong.

Security fixes will still be made to the NetBSD-7 branch.

We hope you're all safe. Stay home.

[0 comments]

 

NetBSD 8.2 is available!


April 02, 2020 posted by Maya Rashish

The third release in the NetBSD-8 is now available.

This release includes all the security fixes in NetBSD-8 up until this point, and other fixes deemed important for stability.

Some highlights include:

  • x86: fixed regression in booting old CPUs
  • x86: Hyper-V Gen.2 VM framebuffer support
  • httpd(8): fixed various security issues
  • ixg(4): various fixes / improvements
  • x86 efiboot: add tftp support, fix issues on machines with many memory segments, improve graphics mode logic to work on more machines.
  • Various kernel memory info leaks fixes
  • Update expat to 2.2.8
  • Fix ryzen USB issues and support xHCI version 3.10.
  • Accept root device specification as NAME=label.
  • Add multiboot 2 support to x86 bootloaders.
  • Fix for CVE-2019-9506: 'Key Negotiation of Bluetooth' attack.
  • nouveau: limit the supported devices and fix firmware loading.
  • radeon: fix loading of the TAHITI VCE firmware.
  • named(8): stop using obsolete dnssec-lookaside.

You can download binaries of NetBSD 8.2 from our Fastly-provided CDN.

For more details refer to the CHANGES-8.2 file.

Please note that we are looking for donations again, see Fundraising 2020.

Enjoy!

Maya

[1 comment]

 

Accomplishment of porting ptrace(2) test scenarios


March 10, 2020 posted by Kamil Rytarowski

This month I have finished porting ptrace(2) tests from other Operating Systems. I have determined which test scenarios were missing, compared to FreeBSD and Linux, and integrated them into the ATF framework. I have skipped some of the tests as the interesting behavior was already covered in existing tests (sometimes indirectly) or tools (like picotrace), or the NetBSD kernel exhibits different behavior.[Read More] [0 comments]

 

Towards backtracing through signal trampolines and fresh libc++


March 09, 2020 posted by Michał Górny

Upstream describes LLDB as a next generation, high-performance debugger. It is built on top of LLVM/Clang toolchain, and features great integration with it. At the moment, it primarily supports debugging C, C++ and ObjC code, and there is interest in extending it to more languages.

In February 2019, I have started working on LLDB, as contracted by the NetBSD Foundation. So far I've been working on reenabling continuous integration, squashing bugs, improving NetBSD core file support, extending NetBSD's ptrace interface to cover more register types and fix compat32 issues, fixing watchpoint and threading support, porting to i386.

During the last month, I've finally managed to create proper reproducers (and tests) for the remaining concurrent signal delivery problems. I have started working on backtracing through signal trampolines, and prepared a libc++ update.

[Read More] [0 comments]

 

NetBSD 9.0 available!


February 15, 2020 posted by Martin Husemann

Six months after the start of the release engineering process, NetBSD 9.0 is now available.

The NetBSD 9.0 release comes with many new features and lots of improvements over the NetBSD 8.1 release...

[Read More] [5 comments]

 

Fundraising 2020


February 13, 2020 posted by Martin Husemann

Fundraising drive 2020: trying to raise $50,000 for more funded development projects to fix itching issues.

[Read More] [2 comments]

 

Approaching the end of work on ptrace(2)


February 11, 2020 posted by Kamil Rytarowski

This is one of my last reports on enhancements on ptrace(2) and the surrounding code. This month I complete a set of older pending tasks.[Read More] [0 comments]

 

LLDB now works on i386


February 08, 2020 posted by Michał Górny

Upstream describes LLDB as a next generation, high-performance debugger. It is built on top of LLVM/Clang toolchain, and features great integration with it. At the moment, it primarily supports debugging C, C++ and ObjC code, and there is interest in extending it to more languages.

In February 2019, I have started working on LLDB, as contracted by the NetBSD Foundation. So far I've been working on reenabling continuous integration, squashing bugs, improving NetBSD core file support, extending NetBSD's ptrace interface to cover more register types and fix compat32 issues, fixing watchpoint and threading support.

The original NetBSD port of LLDB was focused on amd64 only. In January, I have extended it to support i386 executables. This includes both 32-bit builds of LLDB (running natively on i386 kernel or via compat32) and debugging 32-bit programs from 64-bit LLDB.

[Read More] [1 comment]

 

Second (final) release candidate for NetBSD 9.0 available!


February 02, 2020 posted by Martin Husemann

Six months after the start of the release engineering process for 9.0, the second (and most likely final) release candidate is now available.

The NetBSD 9.0 release comes with many new features and lots of improvements over the NetBSD 8.1 release...

[Read More] [4 comments]

 

Improving the ptrace(2) API and preparing for LLVM-10.0


January 13, 2020 posted by Kamil Rytarowski

This month I have improved the NetBSD ptrace(2) API, removing one legacy interface with a few flaws and replacing it with two new calls with new features, and removing technical debt.

As LLVM 10.0 is branching now soon (Jan 15th 2020), I worked on proper support of the LLVM features for NetBSD 9.0 (today RC1) and NetBSD HEAD (future 10.0).[Read More] [0 comments]