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Re: [RFC PATCH 00/34] The rest of the x86_64-gnu port

From: Sergey Bugaev
Subject: Re: [RFC PATCH 00/34] The rest of the x86_64-gnu port
Date: Tue, 21 Mar 2023 15:37:28 +0300

On Tue, Mar 21, 2023 at 3:20 PM Luca <luca@orpolo.org> wrote:
> did you add $(task-resume) in the boot script?

$(prompt-task-resume), yes.

But (see my later mail) Mach hits a page fault trying to printf "task
loaded:", it never gets to resuming the task. This must be due to some
difference in how we're running QEMU (i.e. what machine it emulates).
FWIW mine QEMU cmdline is: qemu-system-x86_64 -m 1G -cdrom
./rootfs.iso (so maybe try that to reproduce it like that?). I can
send you my rootfs.iso too, if that's needed.

> #2  0x0000000000400645 in abort () at abort.c:64
> #3  0x0000000000400586 in _dl_start () at
> ../sysdeps/mach/hurd/x86/init-first.c:267
> #4  0x00000000004ae9f7 in __thread_set_state
> (target_thread=target_thread@entry=5,
>      flavor=flavor@entry=7, new_state=new_state@entry=0xbfffff30,
>      new_stateCnt=new_stateCnt@entry=4)
>      at
> /home/sergey/dev/crosshurd64/src/glibc/build/mach/RPC_thread_set_state.c:124
> #5  0x000000000040c529 in _hurd_tls_new (tcb=0x514cc0 <__init1_tcbhead>,
> child=5)
>      at ../sysdeps/mach/hurd/x86_64/tls.h:166
> #6  _hurd_tls_init (tcb=0x514cc0 <__init1_tcbhead>) at
> ../sysdeps/mach/hurd/x86_64/tls.h:187

🎉 — that is the (for now) expected crash on trying to set fs_base.
Please implement the proposed i386_fsgs_base_state in gnumach to make
glibc proceed further :)

As for the actual crash inside hurd_self_sigstate () — maybe abort ()
needs a simpler implementation for the __LIBC_NO_TLS () case, one that
does not involve sigstate. But it doesn't really matter much — abort
was called to crash the task, it did crash, the job is done :)


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