Bug 229710

Summary: lang/mono: port to aarch64
Product: Ports & Packages Reporter: Greg V <greg>
Component: Individual Port(s)Assignee: freebsd-mono mailing list <mono>
Status: New ---    
Severity: Affects Only Me CC: emaste, greg, linimon, mikael.urankar
Priority: --- Flags: bugzilla: maintainer-feedback? (mono)
Version: Latest   
Hardware: Any   
OS: Any   
Bug Depends on:    
Bug Blocks: 201763    
Attachments:
Description Flags
mono-aarch64.patch
none
mono-aarch64.patch
none
mono-aarch64.patch v2 none

Description Greg V 2018-07-12 01:45:30 UTC
Created attachment 195063 [details]
mono-aarch64.patch

I don't know why I did this, I'm not even planning to use .NET on my RPi3, I guess it was just bothering me that it worked on armv7 and not aarch64… (also I needed to do something in parallel while Crystal was compiling on the ThunderX I rented from packet.net)

Hopefully I didn't screw anything up (I was modifying the port as errors appeared, did not clean and rebuild from scratch — it's slow and access to a ThunderX is expensive… honestly it's not much faster than RPi here because of an issue described below)

The Roslyn C# compiler has a concurrency problem on aarch64: https://github.com/mono/mono/issues/7017 (not FreeBSD specific) so the workaround is to disable parallelism… so the .NET libraries are built very very slowly :(

BoringSSL patch is from bug 223019 but slightly modified (to ignore <sys/auxv.h>), see comment in that thread.

Also there was an intermittent jemalloc error, had to restart the build once:

<jemalloc>: /usr/src/contrib/jemalloc/include/jemalloc/internal/extent_inlines.h:63: Failed assertion: "szind < NSIZES"                                                               

=================================================================
Got a SIGABRT while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================

gmake[14]: *** [../../../build/library.make:342: ../../../class/lib/net_4_x-linux/Facades/System.IO.FileSystem.Primitives.dll] Abort trap (core dumped)
Comment 1 mikael.urankar 2018-08-06 15:37:03 UTC
(In reply to Greg V from comment #0)
Can you regenerate the patch, the plist patch is broken:
svn patch --strip 3 --dry-run patch.aarch64 
U         Makefile
>         applied hunk @@ -60,6 +60,15 @@ with offset 4
>         applied hunk @@ -88,4 +97,4 @@ with offset 4
A         files/extra-patch-aarch64-race-workaround
U         files/patch-configure.ac
A         files/patch-external_boringssl_crypto_cpu-aarch64-linux.c
A         files/patch-mono_sgen_sgen-archdep.h
A         files/patch-mono_utils_mono-sigcontext.h
C         pkg-plist
>         rejected hunk @@ -2937,38 +2937,38 @@
Summary of conflicts:
  Text conflicts: 1


It builds fine on -current (I don't have the jemalloc issue and I don't need the extra patch on my board), have you tried on 11.1 or 11.2?
Comment 2 Greg V 2018-08-06 17:10:02 UTC
Created attachment 195945 [details]
mono-aarch64.patch

Sure, this should be a diff against current master.

I only tried on CURRENT.

jemalloc — maybe you got lucky, it only happened once during my build. Or maybe this was fixed — I used an old current snapshot for the build.

extra-patch — looks like the model of the processor matters. The concurrency bug is definitely happening on Cavium ThunderX (it's been happening to everyone on Linux before I even tried on FreeBSD).
Comment 3 mikael.urankar 2018-08-07 14:39:40 UTC
It builds fine on 11.1.
Comment 4 Colin T. 2018-11-24 05:37:28 UTC
Part of this patch has been merged upstream:
https://github.com/mono/mono/pull/11638
Comment 5 Greg V 2018-12-28 14:52:05 UTC
Created attachment 200579 [details]
mono-aarch64.patch v2

Updated patch with correct cpu feature detection in boringssl (thanks: Mikael)
Comment 6 mikael.urankar 2019-03-18 09:20:32 UTC
Can this patch gets reviewed/commited?
thanks