From: Peter Maydell <1900779@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 1900779] Re: xp /16i on arm mixes DWords
Date: Thu, 22 Oct 2020 13:38:32 -0000 [thread overview]
Message-ID: <160337391257.31600.16105620749858959285.malone@gac.canonical.com> (raw)
In-Reply-To: 160324353545.18570.15111142462284405315.malonedeb@chaenomeles.canonical.com
Thanks for the bug report; I've just posted a patch which should fix it:
https://patchew.org/QEMU/20201022132445.25039-1-peter.maydell@linaro.org/
** Changed in: qemu
Status: Confirmed => In Progress
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https://bugs.launchpad.net/bugs/1900779
Title:
xp /16i on arm mixes DWords
Status in QEMU:
In Progress
Bug description:
I was working with qemuand wanted to understag ATAG structure.
In Monitor mode I used xp /16i 0x100 and I got really confused.
with xp /16i 0x100:
At address 0x120 the DWords are 0x00000000, 0x00000004, 0x54410009, 0x74736574
with xp /16x 0x100:
At address 0x120 the DWords are 0x54410001, 0x00000001, 0x00000001, 0x00000000
from my Terminal:
(qemu) xp /16x 0x100
0000000000000100: 0x00000005 0x54410001 0x00000001 0x00001000
0000000000000110: 0x00000000 0x00000004 0x54410002 0x3c000000
0000000000000120: 0x00000000 0x00000004 0x54410009 0x74736574
0000000000000130: 0x00000000 0x00000000 0x00000000 0x00000000
(qemu) xp /16i 0x100
0x00000100: 00000005 andeq r0, r0, r5
0x00000104: 54410001 strbpl r0, [r1], #-1
0x00000108: 00000001 andeq r0, r0, r1
0x0000010c: 00001000 andeq r1, r0, r0
0x00000110: 00000000 andeq r0, r0, r0
0x00000114: 00000004 andeq r0, r0, r4
0x00000118: 54410002 strbpl r0, [r1], #-2
0x0000011c: 3c000000 .byte 0x00, 0x00, 0x00, 0x3c
0x00000120: 54410001 strbpl r0, [r1], #-1
0x00000124: 00000001 andeq r0, r0, r1
0x00000128: 00001000 andeq r1, r0, r0
0x0000012c: 00000000 andeq r0, r0, r0
0x00000130: 00000004 andeq r0, r0, r4
0x00000134: 54410002 strbpl r0, [r1], #-2
0x00000138: 3c000000 .byte 0x00, 0x00, 0x00, 0x3c
0x0000013c: 00000000 andeq r0, r0, r0
(increasing length only results in more 00000000 andeq r0, r0, r0 Lines)
Version:
4.2.1Debian 1:4.2-3ubuntu6.6
Commandline:
qemu-system-arm -machine raspi2 --nographic -S -s -kernel ./vmlinuz --append "test"
./vmlinuz is a x64 linux kernel. I didn't care about architecture because i just wanted to see ATAG structure.
I also tried
qemu-system-arm -machine raspi2 --nographic -S -s -kernel ./overview.pdf --append "test"
same result.
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next prev parent reply other threads:[~2020-10-22 13:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-21 1:25 [Bug 1900779] [NEW] xp /16i on arm mixes DWords Chaoscode
2020-10-21 2:05 ` [Bug 1900779] " Chaoscode
2020-10-22 12:14 ` Peter Maydell
2020-10-22 13:38 ` Peter Maydell [this message]
2020-11-04 22:23 ` John Snow
2020-11-04 22:27 ` John Snow
2020-12-10 8:49 ` Thomas Huth
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