Jan Nieuwenhuizen writes:

Hi Danny!

>> On Thu, 18 Feb 2021 22:52:57 +0100
>> Jan Nieuwenhuizen <janneke@gnu.org> wrote:
>> Since this only affects the syscall interface and since also our
>> ELF headers specify EABI, I would just change the syscalls to EABI:
>> Just put the syscall number into r7 and use svc 0.
>
> Oh, if that's all we should be able to find and fix it?

I took a stab at it and created the attached patch, also on
wip-arm-bootstrap now.  This allows creating simple binaries using
gcc-core-mesboot0 and glibc-mesboot0 that run, like "return 42" and even
"exit (42)".  But something like puts or printf segfaults "Illegal
instruction" in strlen:

--8<---------------cut here---------------start------------->8---
(gdb) disas /r
Dump of assembler code for function strlen:
   0x0000d160 <+0>:	03 10 c0 e3	bic	r1, r0, #3
=> 0x0000d164 <+4>:	04 20 91 e4	ldr	r2, [r1], #4
--8<---------------cut here---------------end--------------->8---

makes no sens to me?  So, trying to build the first glibc-based gcc

--8<---------------cut here---------------start------------->8---
./pre-inst-env guix build -e '(@@ (gnu packages commencement) gcc-mesboot0)'
--8<---------------cut here---------------end--------------->8---

still fails during configure.  Seems like I'm stuck here again,
hopefully you can spot some silly mistake in my patch or have another
helpful insight :-)

Greetings,
Janneke