Re: cmake 3.31.7 bootstrap illegal instruction on Sparc32 (qemu) ?

To: port-sparc%netbsd.org@localhost, vom513 <vom513%gmail.com@localhost>
Subject: Re: cmake 3.31.7 bootstrap illegal instruction on Sparc32 (qemu) ?
From: Andrew Randrianasulu <randrianasulu%gmail.com@localhost>
Date: Sat, 6 Dec 2025 07:35:01 +0300

On Sat, Dec 6, 2025 at 10:13 AM Andrew Randrianasulu
<randrianasulu%gmail.com@localhost> wrote:
>
>
>
> сб, 6 дек. 2025 г., 07:02 Andrew Randrianasulu <randrianasulu%gmail.com@localhost>:
>>
>> On Sat, Dec 6, 2025 at 6:56 AM Andrew Randrianasulu
>> <randrianasulu%gmail.com@localhost> wrote:
>> >
>> > On Sat, Dec 6, 2025 at 5:57 AM Andrew Randrianasulu
>> > <randrianasulu%gmail.com@localhost> wrote:
>> > >
>> > > On Sat, Dec 6, 2025 at 4:35 AM Andrew Randrianasulu
>> > > <randrianasulu%gmail.com@localhost> wrote:
>> > > >
>> > > > On Fri, Dec 5, 2025 at 4:06 PM Valery Ushakov <uwe%stderr.spb.ru@localhost> wrote:
>> > > > >
>> > > > > On Fri, Dec 05, 2025 at 11:35:23 +0300, Andrew Randrianasulu wrote:
>> > > > >
>> > > > > > So, I am still trying to build things from slightly older pkgsrc tree,
>> > > > > > and Cmake 3.31.7 fails witch attached gzipped log, ending with illegal
>> > > > > > instruction.
>> > > > > >
>> > > > > > Qemu line:
>> > > > > > qemu-system-sparc -hda sparc-netbsd-15g-compressed.qcow2 -m 1536 -g
>> > > > > > 1024x768x24 -M SS-20 -smp 3 -accel tcg,thread=multi,tb-size=256
>> > > > > >
>> > > > > > qemu --version:
>> > > > > > qemu-system-sparc --version
>> > > > > > QEMU emulator version 9.1.50 (v9.1.0-1687-gf0cfd06786-dirty)
>> > > > > > Copyright (c) 2003-2024 Fabrice Bellard and the QEMU Project developers
>> > > > > >
>> > > > > > Note that this configuration survived gnutls , libbluray,
>> > > > > > libtheora-1.2.0  builds
>> > > > > > so generally it works ?
>> > > >
>> > > > even installing pre-build pkg by Vom513 still gives illegal instruction
>> > > >
>> > > > https://mastodon.online/@Andrew_R/115670749252048951
>> > > >
>> > > > _atomic_fetch_add_4 in /usr/pkg/lib/libatomic.so.3 ..
>> >
>> >
>> > 0xede93374 in __atomic_fetch_add_4 () from /usr/pkg/lib/libatomic.so.3
>> > (gdb) disassemble /s __atomic_fetch_add_4
>> > Dump of assembler code for function __atomic_fetch_add_4:
>> >    0xede9335c <+0>:       save  %sp, -96, %sp
>> >    0xede93360 <+4>:       mov  %i0, %g2
>> >    0xede93364 <+8>:       ld  [ %i0 ], %g1
>> >    0xede93368 <+12>:      unknown
>> >    0xede9336c <+16>:      mov  %g1, %i0
>> >    0xede93370 <+20>:      add  %g1, %i1, %g3
>> > => 0xede93374 <+24>:      casa  [ %g2 ] #ASI_P, %g1, %g3
>> >    0xede93378 <+28>:      unknown
>> >    0xede9337c <+32>:      cmp  %g3, %i0
>> >    0xede93380 <+36>:      unknown
>> >    0xede93384 <+40>:      mov  %g3, %g1
>> >    0xede93388 <+44>:      rett  %i7 + 8
>> >    0xede9338c <+48>:      nop
>> > End of assembler dump.
>>
>> ow, it was /sr
>>
>> (gdb) disassemble /sr  __atomic_fetch_add_4
>> Dump of assembler code for function __atomic_fetch_add_4:
>>    0xede9335c <+0>:       9d e3 bf a0     save  %sp, -96, %sp
>>    0xede93360 <+4>:       84 10 00 18     mov  %i0, %g2
>>    0xede93364 <+8>:       c2 06 00 00     ld  [ %i0 ], %g1
>>    0xede93368 <+12>:      81 43 e0 0f     unknown
>>    0xede9336c <+16>:      b0 10 00 01     mov  %g1, %i0
>>    0xede93370 <+20>:      86 00 40 19     add  %g1, %i1, %g3
>> => 0xede93374 <+24>:      c7 e0 90 01     casa  [ %g2 ] #ASI_P, %g1, %g3
>>    0xede93378 <+28>:      81 43 e0 0f     unknown
>>    0xede9337c <+32>:      80 a0 c0 18     cmp  %g3, %i0
>>    0xede93380 <+36>:      12 47 ff fa     unknown
>>    0xede93384 <+40>:      82 10 00 03     mov  %g3, %g1
>>    0xede93388 <+44>:      81 cf e0 08     rett  %i7 + 8
>>    0xede9338c <+48>:      01 00 00 00     nop
>> End of assembler dump.
>>
>> still hm.
>
>
> https://gitlab.com/qemu-project/qemu/-/issues/1771
>
> but this affects qemu-sparc userspace emulator? (so Linux-on-linux)
>
> Now, time to retest with -cpu LEON3 ...

Ah, it dies with SS-20 and LEON2/3 cpus:

qemu-system-sparc -cpu LEON2 -hda sparc-netbsd-15g-compressed-r1.qcow2
-m 1536 -g 1024x768x24 -M SS-20
qemu: fatal: Trap 0x21 (Instruction Access Error) while interrupts
disabled, Error state
pc: ffd06290  npc: ffd06294
%g0-7: 00000000 00000001 ffd06290 00002000 ffd5e004 ffd5e000 60000000 05fffe00
%o0-7: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
%l0-7: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
%i0-7: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
%f00:  0000000000000000 0000000000000000 0000000000000000 0000000000000000
%f08:  0000000000000000 0000000000000000 0000000000000000 0000000000000000
%f16:  0000000000000000 0000000000000000 0000000000000000 0000000000000000
%f24:  0000000000000000 0000000000000000 0000000000000000 0000000000000000
psr: f24000c0 (icc: -Z-- SPE: SP-) wim: 00000001
fsr: 00080000 y: 00000041

./qemu/build/qemu-system-sparc -cpu LEON3 -hda
sparc-netbsd-15g-compressed-r1.qcow2 -m 1536 -g 1024x768x24 -M SS-20
qemu: fatal: Trap 0x02 (Illegal Instruction) while interrupts
disabled, Error state
pc: 00000000  npc: 00000004
%g0-7: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
%o0-7: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
%l0-7: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
%i0-7: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
%f00:  0000000000000000 0000000000000000 0000000000000000 0000000000000000
%f08:  0000000000000000 0000000000000000 0000000000000000 0000000000000000
%f16:  0000000000000000 0000000000000000 0000000000000000 0000000000000000
%f24:  0000000000000000 0000000000000000 0000000000000000 0000000000000000
psr: f34000c0 (icc: -Z-- SPE: SP-) wim: 00000001
fsr: 00080000 y: 00000000






>
>
>
>>
>> Note, that this is on Generic.MP kernel from 10.1
>>
>> >
>> > Hm ...
>> >
>> > attempt at building libatomic inside this VM also failed (even without
>> > any -smp  or -cpu params)
>> >
>> >
>> > > >
>> > > > even with cpu set to
>> > > >
>> > > > qemu-system-sparc -hda sparc-netbsd-15g-compressed.qcow2 -m 1536 -g
>> > > > 1024x768x24 -M SS-20 -smp 3 -accel tcg,thread=multi,tb-size=256 -cpu
>> > > > TI-SuperSparc-60
>> > >
>> > > Strange, bug still exist on
>> > >
>> > > ./qemu/build/qemu-system-sparc --version
>> > > QEMU emulator version 10.1.92 (v10.2.0-rc2-31-g2257f52a97-dirty)
>> > > Copyright (c) 2003-2025 Fabrice Bellard and the QEMU Project developers
>> > >
>> > > compiled for i586 on Slackware 15.0
>> > >
>> > > Next try: put VM to real netBSD amd64 partition, try qemu from there
>> > >
>> > >
>> > > >
>> > > >
>> > > > >
>> > > > > I had varying success with qemu sparc.  Incidentally, I was trying to
>> > > > > build cmake too (that I needed to build some other project, not in
>> > > > > pkgsrc).
>> > > > >
>> > > > > cmake and/or modern c++ compilers are hogs... so I'm not surprised
>> > > > > that particular combination (builing cmake on qemu sparc) might have
>> > > > > reached some darker corners where qemu is not that stable.
>> > > > >
>> > > > > That was an year ago or so, so my memory is hazy.  But IIRC, in the
>> > > > > end it was faster to loan an ultra1 from a friend setup it and build
>> > > > > cmake there.
>> > > > >
>> > > > > PS: My first attempt to build cmake was natively on a (diskless)
>> > > > > javastataion.  That gave me a new reference for "exercise in futility"
>> > > > > (I think I gave up after couple of weeks or so).  That's when I turned
>> > > > > to qemu.  For scale: I also needed to build cmake on macos/ppc (for
>> > > > > the same project).  My mini g4 (1.25GHz cpu with 1G ram) took about a
>> > > > > week to build cmake from macports from scratch.  That time was mostly
>> > > > > spent builidng gcc10 and gcc14, though.  cmake proper was about a day
>> > > > > only, I think.
>> > > > >
>> > > > > -uwe

References:
- cmake 3.31.7 bootstrap illegal instruction on Sparc32 (qemu) ?
  - From: Andrew Randrianasulu
- Re: cmake 3.31.7 bootstrap illegal instruction on Sparc32 (qemu) ?
  - From: Valery Ushakov
- Re: cmake 3.31.7 bootstrap illegal instruction on Sparc32 (qemu) ?
  - From: Andrew Randrianasulu
- Re: cmake 3.31.7 bootstrap illegal instruction on Sparc32 (qemu) ?
  - From: Andrew Randrianasulu
- Re: cmake 3.31.7 bootstrap illegal instruction on Sparc32 (qemu) ?
  - From: Andrew Randrianasulu
- Re: cmake 3.31.7 bootstrap illegal instruction on Sparc32 (qemu) ?
  - From: Andrew Randrianasulu
- Re: cmake 3.31.7 bootstrap illegal instruction on Sparc32 (qemu) ?
  - From: Andrew Randrianasulu

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