From: Danny Milosavljevic <dannym@scratchpost.org>
To: Jan Nieuwenhuizen <janneke@gnu.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 02:03:30 +0100 [thread overview]
Message-ID: <20210222020330.74832a2b@scratchpost.org> (raw)
In-Reply-To: <87v9als2ag.fsf@gnu.org>
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Hi Janneke,
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)
>* sysdeps/unix/sysv/linux/arm/brk.c (__brk): Likewise.Likewise.
Duplicate "Likewise".
Otherwise LGTM!
>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.
I'm building it right now and will have a look.
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next prev parent reply other threads:[~2021-02-22 1:05 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 [this message]
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
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