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From: Jan Nieuwenhuizen <janneke@gnu.org>
To: Danny Milosavljevic <dannym@scratchpost.org>
Cc: Vagrant Cascadian <vagrant@debian.org>,
	guix-devel@gnu.org, bug-mes@gnu.org
Subject: Re: Update on wip-arm-bootstrap
Date: Mon, 22 Feb 2021 07:14:29 +0100	[thread overview]
Message-ID: <87r1l8ljcq.fsf@gnu.org> (raw)
In-Reply-To: <20210222020330.74832a2b@scratchpost.org> (Danny Milosavljevic's message of "Mon, 22 Feb 2021 02:03:30 +0100")

Danny Milosavljevic writes:

Hello Danny,

> Nice!
>
> Patch review:
>
>>+#if __ARM_EABI__
>>+#define CLEAR_CACHE(BEG,END)						\
>>+{									\
>>+  register unsigned long _beg __asm ("a1") = (unsigned long)(BEG);	\
>>+  register unsigned long _end __asm ("a2") = (unsigned long)(END);	\
>>+  register unsigned long _flg __asm ("a3") = 0;				\
>>+  __asm __volatile ("mov r7, 0x9f0002\n\t"				\
>
> should be mov r7, 0xf0002 in EABI.
> (SWI #(0x900000 + syscallnr) is for OABI syscalls only)

Ok, great; that could help!

>>* sysdeps/unix/sysv/linux/arm/brk.c (__brk): Likewise.Likewise.
>
> Duplicate "Likewise".
>
> Otherwise LGTM!

Thanks.  Testing a fixup now (currently only on my branch @gitlab).

>>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---
>
> Hmm... looks good to me?  Weird.

Yes...

> I'm building it right now and will have a look.

Great, thanks!
Janneke

-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
Freelance IT http://JoyofSource.com | Avatar® http://AvatarAcademy.com


      parent reply	other threads:[~2021-02-22  6:15 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-13  9:25 Update on wip-arm-bootstrap Jan Nieuwenhuizen
2021-02-18 17:26 ` Ludovic Courtès
2021-02-21 18:17   ` Jan Nieuwenhuizen
2021-02-22  1:03     ` Danny Milosavljevic
2021-02-18 17:48 ` Vagrant Cascadian
2021-02-18 21:52   ` Jan Nieuwenhuizen
2021-02-19  4:23     ` Danny Milosavljevic
2021-02-19  6:17       ` Jan Nieuwenhuizen
2021-02-21 18:28         ` Jan Nieuwenhuizen
2021-02-22  1:03           ` Danny Milosavljevic
2021-02-22  1:50             ` Danny Milosavljevic
2021-02-22  6:01               ` Jan Nieuwenhuizen
2021-02-22 17:09                 ` Danny Milosavljevic
2021-02-22 17:34                   ` Danny Milosavljevic
2021-02-22  6:14             ` Jan Nieuwenhuizen [this message]

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